JPH11239175A - Packet processing device - Google Patents

Abstract

(57) [Problem] To provide a packet processing device capable of replacing only data to be replaced of a packet requiring replacement with correct data and outputting the corrected data. SOLUTION: When one or more sets of replacement target packet IDs and replacement data are set in a replacement data storage unit 1021 and a packet judgment unit 1022 detects that the input packet is a replacement target packet ID. The packet assembling unit 1023 assembles a replacement packet based on the replacement data corresponding to the replacement target packet, and the packet replacement unit 1024 replaces the input packet with the replacement packet and outputs the replacement packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet processing apparatus, and more particularly, to recording data obtained by receiving a digital satellite television broadcast or data retrieved from a data storage apparatus in another storage apparatus, a personal computer, or the like. The present invention relates to a packet processing apparatus having a data replacement function of deleting unnecessary data and replacing the data so as to newly add necessary data when outputting the data to another device.

[0002]

2. Description of the Related Art In recent years, information such as video, audio, subtitles, and the like has been frequently broadcasted or stored in the form of digital data. In such a case, the data is generally divided for each predetermined data length, and transmitted and stored in a packet format. In this case, after a plurality of data are constructed in a packet, the data may be multiplexed on one transmission and storage medium, transmitted and stored. As an international standard for the data structure and the multiplexing method in such a case, there is a transport stream defined in the MPEG2 system standard. One example of packet data transmission in such a format is digital satellite television broadcasting. Digital satellite television broadcasting has the same image quality as ordinary analog television broadcasting. Can be broadcast at the same time.

[0003] In such digital satellite television broadcasting, a plurality of programs are multiplexed into one data stream and broadcast. At that time, a transport stream is used. The transport stream is composed of fixed-length packets called transport stream packets, and each transport stream packet is assigned an identification number called a packet ID according to the type of data stored in the packet. .

For example, when programs 1 and 2 are transmitted by a single transport stream, the types of data to be transmitted include video data of program 1, audio data of program 1, video data of program 2, and video data of program 2. 2. Packet ID assignment table for audio data and programs (Program Association)
n Table; hereinafter referred to as PAT), packet 1 of program 1
D allocation table (Program Map Table; hereinafter, referred to as PMT), PMT for program 2, and correspondence table between broadcast frequency and program (Network Information Table; hereinafter, referred to as NIT)
and so on. The PMT stores a packet ID assigned to video and audio data of each program. The PAT stores a packet ID for the PMT of each program.

[0005] When a digital satellite television broadcast program is to be recorded by digital recording, a transport stream format may be used.

The reason is that a plurality of programs are recorded in a data format for transmission, so that a plurality of programs can be simultaneously recorded on one recording medium.
It is easy to convert from the broadcast data format. Another advantage is that video and audio can be taken out using a digital broadcast receiver during reproduction.

[0007]

However, when such digital broadcast data is to be recorded by a digital VTR, it is not necessary to simultaneously record all programs multiplexed and broadcast at the same time. Also,
If all programs are to be recorded at the same time, it is necessary to design a large recording band of a digital VTR capable of recording in a transport stream format, which causes an increase in the cost of a digital satellite television VTR device for home use. .

Therefore, instead of recording all of the digital broadcast data as it is, by extracting and recording at most a few programs, the recording bandwidth can be reduced without causing practical inconvenience. It is conceivable to realize recording in the transport stream format at low cost.

However, as shown in the above conventional example,
Information transmitted as a transport stream includes:
Not only program-specific data such as video and audio,
There is data common to all programs, such as AT and NIT. For this reason, when extracting only a part of the program from the input transport stream and outputting it for recording, unnecessary information is removed from the original transport stream packet and some information is rewritten. Or add new information.

For example, two programs are broadcast by transport stream packets of the kind described above. When only program 1 is recorded, packets storing unnecessary video and audio of program 2 are stored. Must be removed when recording. It is also better to remove the PMT for Program 2. Further, the PAT packet storing the PMT packet IDs of Program 1 and Program 2 is the PMT packet of Program 1
Must be replaced with a PAT that stores only the packet ID of the PAT.

If the packet ID of the PMT of program 2 is P
If the recording is performed while remaining in the AT, the PAT indicates that the program 2 is recorded.
Cannot be determined at the time of reproduction.

The NIT stores information for broadcasting and is not necessary for storing programs.
Information such as T (Selection Information Table) that is not included in the broadcast but is necessary for storage must be newly multiplexed and recorded in the transport stream. Further, if unnecessary information remains, an extra recording band is used for the unnecessary information.

For these reasons, when data received from a broadcast or data extracted from a storage device is to be recorded in the storage device or output to another device such as a personal computer, the input data is output. In order to convert the data into data suitable for the previous device, unnecessary data must be replaced with new required data and output.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a data replacement function of automatically replacing unnecessary data in a packet with newly required data and outputting the data. It is intended to obtain a packet processing device having the following.

[0015]

According to a first aspect of the present invention, there is provided a packet processing apparatus comprising: a packet input unit for sequentially inputting packet format data as an input packet; and a packet to be replaced from the input packet. And a packet replacement means for performing the replacement of the packet to be replaced.

According to a second aspect of the present invention, there is provided a packet processing apparatus, comprising: a packet input means for sequentially inputting packet format data as an input packet; and detecting table data to be replaced in the input packet. And a table data replacing means for executing the replacement of the table data.

According to a third aspect of the present invention, in the packet processing apparatus of the first aspect,
The packet replacement unit includes a replacement correspondence table data storage unit that stores replacement correspondence table data indicating a correspondence between a replacement target packet indicating a packet to be replaced and replacement data to be replaced with the replacement target packet. A replacement target packet detecting means for detecting whether or not the input packet corresponds to the replacement target packet; and, if the input packet corresponds to the replacement target packet, referencing the replacement correspondence table data and performing the replacement. The data is read, a replacement packet including the replacement data is assembled, the replacement packet is replaced with the replacement packet, and the replacement packet is output. If the input packet is not the replacement packet, the input packet is output as it is. Is obtained so as to include a packet output unit.

A packet processing device according to a fourth aspect of the present invention is the packet processing device according to the second aspect,
The table data replacement means is a replacement correspondence table data for storing replacement correspondence table data indicating a correspondence between a replacement target packet indicating a packet including table data to be replaced and post-replacement data to be replaced. Storage means, input packet detection means for detecting whether or not the input packet is a packet including the replacement target table data, and, if the input packet corresponds to a packet including the replacement target table data, The replacement data is read out with reference to the replacement correspondence table data, replacement table data including the replacement data is assembled, the replacement target table data is replaced with the replacement table data, and the replacement packet data is output. If that does not contain target table data replacement is obtained by so and a packet output unit that outputs the said input packet.

A packet processing device according to a fifth aspect of the present invention is the packet processing device according to the first aspect,
The packet replacement unit includes a replacement correspondence table data storage unit that stores replacement correspondence table data indicating a correspondence between a replacement target packet indicating a packet to be replaced and a replaced packet to be replaced with the replacement target packet. A replacement target packet detecting means for detecting whether or not the input packet corresponds to the replacement target packet; and, if the input packet corresponds to the replacement target packet, referencing the replacement correspondence table data and performing the replacement. A packet output unit that reads out a packet, replaces the packet to be replaced with the packet after replacement, and outputs the packet. is there.

A packet processing device according to a sixth aspect of the present invention is the packet processing device according to the second aspect,
The table data replacement means is a replacement correspondence table for storing replacement correspondence table data indicating correspondence between a replacement target packet indicating a packet including table data to be replaced and a replacement table data to be replaced with the replacement target packet. Data storage means, input packet detection means for detecting whether or not the input packet is a packet including the replacement target table data, and if the input packet corresponds to a packet including the replacement target table data, The replacement table data is read out with reference to the replacement correspondence table data, the replacement target table data is replaced with the replacement table data and output, and the input packet is a packet including the replacement target table data. When have is obtained by so and a packet output unit that outputs the said input packet.

A packet processing apparatus according to a seventh aspect of the present invention includes a packet input unit for sequentially inputting data in a packet format as an input packet, detecting a packet to be replaced from the input packet, and Packet replacement means for performing replacement of a packet to be replaced, and a packet to be replaced information setting for determining a packet to be replaced based on information instructed from the outside, and setting information on the determined replacement target packet in the packet replacement means. Means, a packet extracting means for extracting a required packet to be decoded from the input packet, and a memory access means for performing a memory access to store the required packet in a memory prior to decoding. is there.

The packet processing apparatus according to the invention of claim 8 of the present application detects packet input means for sequentially inputting packet format data as an input packet, and detects table data to be replaced from the input packet. A table data replacement unit for performing the replacement of the replacement target table data, and table data to be replaced based on information instructed from the outside, and setting information on the determined replacement target table data in the table data replacement unit Means for setting table data information to be replaced, packet extracting means for extracting a required packet to be decoded from the input packet, and memory access for performing memory access to store the required packet in a memory prior to decoding. It is obtained so as to include a scan unit.

A packet processing device according to a ninth aspect of the present invention is the packet processing device according to the seventh aspect,
The packet replacement means includes replacement data storage means for storing replacement correspondence table data indicating a correspondence between a replacement target packet indicating a packet to be replaced, and replacement data to be replaced with the replacement target packet; Means for detecting whether or not the packet to be replaced corresponds to the packet to be replaced, and, if the input packet corresponds to the packet to be replaced, refers to the replacement correspondence table data and replaces the data after replacement. A packet output for reading, assembling a replacement packet including the post-replacement data, replacing the replacement target packet with the replacement packet, and outputting the input packet if the input packet is not the replacement target packet. It is obtained so as to include a stage.

According to a tenth aspect of the present invention, in the packet processing apparatus of the ninth aspect, the table data replacing means includes a packet to be replaced indicating a packet including table data to be replaced. Replacement data storage means for storing replacement correspondence table data indicating the correspondence between replacement data to be replaced and the replacement data, and detecting whether or not the input packet is a packet including the replacement target table data. Input packet detecting means, and when the input packet corresponds to a packet including the replacement target table data, reading the replacement data with reference to the replacement correspondence table data, and replacing the replacement table data including the replacement data. Assemble and place above And replacing the target table data with the replacement table data, and outputting the input packet when the input packet does not include the replacement target table data. .

The packet processing device according to the invention of claim 11 of the present application is the packet processing device according to claim 7, wherein the packet replacement means includes a packet to be replaced indicating a packet to be replaced, Table replacement data storage means for storing replacement correspondence table data indicating the correspondence between the replacement packet to be replaced, and replacement target packet detection means for detecting whether the input packet corresponds to the replacement target packet, When the input packet corresponds to the replacement target packet, the replacement packet is read by referring to the replacement correspondence table data, and the replacement target packet is replaced with the replacement packet and output. In the above packet to be replaced When have is obtained by so and a packet output unit that outputs the said input packet.

The packet processing device according to the invention of claim 12 of the present application is the packet processing device according to claim 8, wherein the table data replacement means includes replacement target table data indicating table data to be replaced, On the other hand, replacement data storage means for storing replacement correspondence table data indicating a correspondence between the replacement table to be replaced, input packet detection means for detecting that the input packet includes the replacement target table data, If the input packet corresponds to a packet including the replacement target table data, the replacement table data is read with reference to the replacement correspondence table data, and the replacement target table data is replaced with the replacement table data and output. And above When a force packet does not contain the target table data replacement above is obtained by so and a packet output unit that outputs the said input packet.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) First, as Embodiment 1 of the present invention, in a digital satellite television broadcast (hereinafter, simply referred to as digital broadcast) conforming to the MPEG system standard, a digital broadcast receiver will be described. Will be described with reference to the packet structure of the transport stream and the like, in which only the program desired by the viewer is extracted and output to the digital VTR. In digital broadcasting, video, audio, and other various information are transmitted in a transport stream as shown in FIG. FIG. 10 is a diagram illustrating the latest point-based MP published by ASCII Corporation on August 1, 1994.
FIG. 11-16 of “EG textbook” p248 is reprinted. In the figure, reference numeral 601 denotes a transport stream, which is composed of a large number of fixed-length transport stream packets (hereinafter, referred to as TS packets or TSPs) 602. It is constituted by doing. TS packet 60
2 is provided with a packet ID (PID) 607 indicating the type of data stored therein. Also, T
The S packet 602 includes synchronization byte information 603 for the decoder to detect the head of the TS packet, and error indication information 60 indicating the presence or absence of a bit error in this packet.
4. Unit start display information 60 indicating that a new PES packet or section starts from this TS packet
5, packet priority information 606 indicating the importance of the payload of the packet, scramble control information 608 indicating the presence / absence of the scramble of this packet, the type thereof, an adaptation field indicating the presence / absence of an adaptation field in this packet and the presence / absence of the payload Control information 609, cyclic counter information 610 for detecting whether or not a packet having the same PID was partially rejected on the way, and additional information and a stuffing byte (invalid data byte) relating to an individual stream are optionally provided. It includes adaptation field information 611 that can be registered and payload information 612 that is effective packet data.

The adaptation field information 611 includes the following packet of the same PID as the system
Discontinuity indicator information 613 indicating that the clock has been reset to a new content;
Indicates the beginning of a header or audio frame,
Random access display information 614 indicating that this is an entry point of random access, stream priority display information 615 indicating that an important part of an individual stream is in the payload of this packet, and the same PID up to an editable point Splice countdown information 616 indicating the number of transport packets is included.

Hereinafter, for the sake of simplicity, assuming that the transport stream transmits two of program 1 and program 2, a TS packet for the video of program 1 (hereinafter referred to as TSP video 1) ), TS for audio of program 1
Packets (hereinafter, referred to as TSP audio 1), TS packets for video of program 2 (hereinafter, referred to as TSP video 2),
A separate packet ID is given to each of the TS packets for the audio of the program 2 (hereinafter, referred to as TSP audio 2). Further, a TS packet for transmitting information PMT (Program Map Table) indicating which packet ID is assigned to which information is set for each program.

The PMT corresponding to program 1 is set to TSP-PMT
1. The PMT corresponding to the program 2 is represented as TSP-PMT2. The PMT contains the T and T of the video and audio of the corresponding program.
The packet ID of the S packet is stored. Also, as information of the entire broadcast, a PAT (Program Asso
TS packet (hereinafter referred to as TS)
P-PAT) and NIT (hereinafter, referred to as TSP-NIT), which indicates the state of a data transmission system of broadcasting, and are assigned packet IDs.

FIG. 11 shows ASCII Corporation, November 1995.
"Point Illustration Practical MPEG Textbook" published on January 1 p1
This figure is a reproduction of FIG. 8-9 of FIG. 44. This figure shows a PAT indicating the correspondence between each program number (16 bits) and the packet ID of the PMT of the program, a table ID 701 indicating the type of table, and a stream ( Transport stream I for identifying multiplexed encoded data)
D702, version number information 703 to be added each time the contents of the table are updated, current next indicator information 704 used to identify new and old versions at the same time, program number information 705 for identifying individual programs, A network PID 706 indicating the PID of the network information table,
A program map PID 707 indicating the PID of the program map table is included.

FIG. 12 is a reproduction of FIG. 8-10 of the above-mentioned "Point Illustrative Practical MPEG Textbook" p.145, which shows, for each program number, video, audio, and additional data constituting the program. A PMT indicating a PID of a packet to which a stream such as a stream is transmitted, a table ID 801 indicating a type of a table, a PCRPID 802 indicating a PID of a packet including a clock (PCR) serving as a reference at the time of decoding, are included in a data stream. Stream type information 803 indicating the type of information is included.

FIG. 13 is a reproduction of FIG. 11-17 of the above-mentioned “Point Illustrated Latest MPEG Textbook” p250. This figure shows an example of the hierarchical structure of the transport stream. PMT9 in the hierarchy
02, 903, and the video stream 904 and the audio stream 9 are located one layer below the PMT 902.
05 is also one of the program map tables 903.
A video stream 906 and an audio stream 907 exist in the lower layer.

FIG. 14 is a reproduction of FIG. 8-11 of the above-mentioned “Point Illustrative Practical MPEG Textbook” p. 146. FIG. The table ID 1001 includes a network ID 1002 for identifying a network.

Although various types of packets are used in actual broadcasting, the description will be made based on the above-described TS packets. Program 1 using the TS packet described above
The following describes the operation in the case where it is assumed that program 2 is being broadcast and this is recorded on a digital VTR.
Here, the digital VTR can record a transport stream, and a case where only the program 1 is recorded will be described as an example.

In recording program 1, first, TS packets (TSP video 1 and TSP audio 1) storing the video and audio of program 1 must be recorded. However, this is not enough, and information indicating the packet ID of the TS packet storing the video and audio must also be recorded. Therefore, the PMT (TSP-PMT) corresponding to the program 1 also needs to be recorded. Further, since the packet ID of the TSP-PMT is indicated by the PAT, it is necessary to record the TSP-PAT.

However, the data stored in the TSP-PAT includes not only the program 1 but also information on the PMT packet ID of the program 2. For this reason, if the broadcasted TSP-PAT is recorded as it is, it cannot be shown that the recorded transport stream does not include the program 2. Therefore, TSP-PAT
Must be corrected so that the PAT data is correct, that is, only the packet ID of the TSP-PMT of program 1 is stored. The same applies to not only the PAT but also the PMT. The packet ID of the TS packet not recorded in the digital VTR among the various TS packets indicating the program 1 must be deleted from the PMT. As described above, when recording a broadcast transport stream on a digital VTR, several T
The information in the S packet must be replaced with correct information.

The present invention relates to a packet processing apparatus capable of performing such TS packet replacement. In the first embodiment, the present invention relates to a case where a program broadcasted by a transport stream is recorded on a digital VTR. The replacement of TS packets will be described.

First, FIG. 1 corresponds to the first to twelfth aspects of the present invention, and shows a digital broadcast incorporating a packet processing device having the above-described packet processing function according to the first embodiment of the present invention. 1 shows the configuration of the receiver.

In FIG. 1, reference numeral 1 denotes an antenna for receiving a digital broadcast, reference numeral 2 denotes a tuner for selecting a transport stream having a desired broadcast frequency from digital broadcast received by the antenna 1, and reference numeral 3 denotes a tuner for tuning. A demodulator 10 for demodulating the transport stream thus demodulated is a transport stream packet processing device for performing processing such as removing TS packets corresponding to unnecessary programs from the transport stream demodulated by the demodulator 3. .

Reference numeral 4 designates data relating to TS packets to be replaced in the transport stream packet processing device 10 based on the viewer's program selection information received by a remote control receiver (not shown). 10. The CPU controls the table data to be replaced based on information specified externally, and sets information on the determined table data to be replaced in the table data replacing means. They correspond to information setting means and replacement target packet information setting means, and together with the transport stream packet processing device 10, constitute inventions of claims 3 to 6 of the present application and claims 9 to 12 of the present application. . 5 is a memory used as a buffer area for data, 6 is an AV decoder that performs AV data processing and outputs reproduced video information, and 7 is a packet output circuit 1.
02 is a digital VTR interface for outputting the output of the digital VTR 02 to a digital VTR (not shown).

In the transport stream packet processing apparatus 10, a packet selection circuit 101 selects a packet corresponding to a program specified by a viewer's remote control operation or the like from among the packets demodulated by the demodulator 3. This corresponds to packet input means for sequentially inputting packet format data as input packets. A packet output circuit 102 rewrites and outputs a part of the selected packet.
Packet replacement means for detecting a packet to be replaced from the input packet and performing replacement of the packet to be replaced, or detecting table data to be replaced in the input packet and replacing the table data. It corresponds to table data replacement means to be executed, and together with the packet selection circuit 101, constitutes the invention of claim 1 or 2 of the present application.
Reference numeral 103 denotes a data extracting circuit for extracting data from the packets selected by the packet selecting circuit 101, and corresponds to a packet extracting means for extracting a required packet to be decoded from the input packets. Numeral 104 denotes a memory access circuit for exchanging data between the data fetch circuit 103 and the memory 5. This memory access means 104 performs a memory access to store the required packet in the memory prior to decoding. This corresponds to a memory access unit.

Next, the operation of FIG. 1 will be described with reference to the flowchart of FIG. Q is the broadcast program of the broadcasting station
The signal is modulated by a modulation method such as AM and QPSK and transmitted from a ground station, relayed by a satellite station, received by an antenna 1 of a digital broadcast receiver, and operated by a viewer by operating a remote control transmitter or the like to obtain a desired broadcast. By inputting the channel number of the station (step S1 in FIG. 15), the tuner 2 selects the corresponding channel. Tuner 2
Is demodulated by the demodulator 3 and converted into a transport stream (hereinafter, referred to as TS) to be input to the TS packet processing apparatus 10.

The T input to the TS packet processor 10
The S packet is input to the packet selection circuit 101. The packet selection circuit 101 extracts a TS packet having a packet ID necessary for viewing and listening to a PAT or for recording on a digital VTR from the transport stream (step S2 in FIG. 15).

If the TS packet thus extracted is a TS packet for viewing, the PMT is extracted from the information in the PAT by the data extracting circuit 103 (step S5 in FIG. 15), and the information in the PMT is extracted. Then, the data of the channel is separated (step S6 in FIG. 15), so that other data such as video, audio, and subtitles are extracted from the TS packet. These data are buffered in the memory 5 by the memory access circuit 104. The video and audio data are extracted from the memory 5 by the AV decoder 6 (step S7 in FIG. 15), subjected to decompression processing, and then output to a display device (not shown). On the other hand, information such as PAT and PMT is CP
It is extracted from the memory 5 by U4 and used by the CPU 4 for controlling the packet processing device of the receiver.

On the other hand, a TS packet to be recorded on the digital VTR is output from the packet selection circuit 101 to the data extraction circuit 103. FIG. 2 shows a configuration diagram of the packet output circuit according to the first embodiment. FIG. 2 is a block diagram showing a packet output circuit, which is a component of the packet processing device according to the first embodiment of the present invention and corresponds to the inventions of claims 1, 3, 7, and 9 of the present application. This packet output circuit is used as the packet output circuit in the transport stream packet processing device of FIG.

In the figure, reference numeral 1021 denotes a T to be replaced.
A set of three sets of the packet ID of the S packet and the replacement data as the data constituting the replacement packet after replacing the S packet is a replacement data storage unit set by the CPU 4 in FIG. Replacement table storage means for storing replacement table data indicating a correspondence between a replacement target packet indicating a target packet and replacement data indicating data after replacement has been performed on replacement target data included in the replacement target packet Is equivalent to FIG.
It is determined whether or not the TS packet forming the selected transport stream input from the packet selection circuit 101 of (a) matches one of the replacement target packet IDs set in the replacement data storage unit 1021;
If they match, the packet judging unit notifies the packet assembling unit 1023 and the packet replacing unit 1024 of the coincidence, and detects whether or not the input packet corresponds to the packet to be replaced. It corresponds to the replacement target packet detecting means. In addition, when the packet determining unit 1022 notifies that the packet ID matches, the replacement data 1023 reads the replacement data corresponding to the matching replacement target packet ID from the replacement data storage unit 1021, and sets the TS packet so that this data is included. The packet assembling unit 1024 that assembles the packet outputs the TS packet output from the packet assembling unit 1023 to the outside when notified of the coincidence from the packet determining unit 1022, and is notified that the packet does not match. In this case, the packet replacement unit outputs the input TS packet output from the packet determination unit 1022 to the outside as it is. The packet assembling unit 1023 and the packet replacement unit 1024 determine whether the input packet corresponds to the replacement target packet. And refer to the replacement table data above The replacement data is read, a replacement packet including the replacement data is assembled, the replacement target packet is replaced with the replacement packet, and the replacement packet is output. If the input packet is not the replacement target packet, the input packet is output as it is. The packet output means 1020 performs the configuration.

Next, the operation of FIG. 2 will be described. For the TS packets constituting the selected transport stream output from the packet selection circuit 101 of FIG. You. This table search may be performed by a linear search, but a plurality of comparators may be arranged in parallel to simultaneously compare the input TS packet with all the replacement target data.

Then, as a result of executing such a table search, when it is determined that the TS packet is to be replaced (step S3 in FIG. 15), the packet assembling unit 1023 transfers the TS packet from the replacement data storage unit 1021 to the replacement unit. The replacement is performed by reading the corresponding replacement data as the replacement data (step S4 in FIG. 15), and after the replacement packet is assembled by the packet assembling unit 1023, the packet replacement unit 1
024 to the outside. On the other hand, when it is determined that the TS packet does not correspond to the replacement target, the TS packet input from the outside passes through the packet replacement unit 1024 and is output to the outside as it is.

Here, consider the case where program 1 is recorded on a digital VTR. In this case, it is necessary to select the video and audio information and PAT relating to only the program 1 from all the transport streams, and to select the PMT of the program 1 and output them to the digital VTR. And at that time, PAT, PM
T must be replaced so that it is the correct information about the output transport stream output to the digital VTR. Here, a case where the input transport stream shown in FIG. 3 is input and the output transport stream of FIG. 3 is output from the packet output circuit will be described.

The input transport stream contains information on two programs, Program 1 and Program 2, and is assumed to be composed of a TS packet sequence as shown in FIG. In FIG. 3, V1 is a video 1, that is, a video of the program 1. Also, S
1 is audio 1, that is, audio of program 1. Similarly, V2, S
Reference numeral 2 denotes video 2 and audio 2, that is, video and audio of program 2.
P is PAT, PM1 is PMT1, that is, P1 of program 1.
MT, and PM2 is PMT2, that is, PMT of program 2.

The input transport stream is first shown in FIG.
, And only the TS packets related to the program 1 are selected. This is the transport stream after selection in FIG.
T (P), TSP video 1 (V1), TSP audio 1 (S
1), TSP-PMT1 (PM1). However, as it is, TSP-PAT (P) and TSP-
Since the information of PMT1 (PM1) is not correct, they must be rewritten to correct data.

The selected transport stream selected by the packet selection circuit 101 is output to the packet output circuit 102. In the following, the packet output circuit 102
The operation of the TS packet replacement function in the above will be described. The following data is set in the replacement data storage unit 1021 in the packet output circuit 102 by the CPU 4 and stored therein.

[0054]

[Table 1]

The selected transport stream input to the packet output circuit 102 is
2 is input. When the input TS packet is TSP video 1 or TSP audio 1, the replacement data storage unit 1
Since the packet ID does not match any of the packet IDs set as the replacement target packet IDs, the TS packet is output from the packet replacement unit 1024 to the outside as it is. On the other hand, the input TS packet
In the case of P-PAT, the packet judgment unit 1022 detects that the packet ID matches the packet ID of TSP-PAT among the packet IDs to be replaced. This coincidence information is transmitted to the packet assembling unit 1023. The packet assembling section 1023 extracts the new PAT data set corresponding to the TSP-PAT packet ID in the replacement data storage section 1021 and assembles it into a TS packet format.
The TS packet assembled here is converted to TSP-new PAT.
(PN). The TSP-new PAT is input to the packet replacement unit 1024. Packet replacement unit 1024
Has been notified from the packet determination unit 1022 that the input TS packet matches one of the packet IDs to be replaced, and the TSP-PAT is used instead of the TSP-PAT.
-Output the new PAT (PN). Similarly, when the TSP-PMT1 is input as the selected transport stream input, the TSP-new PMT1 including the data of the new PMT1 set in the replacement data storage unit 1021 is similarly used.
(PM1N) and output.

In this way, the input transport stream shown in FIG. 3 can be output by replacing the TS packets in the input transport stream that need to be rewritten with newly assembled TS packets. Thus, the input transport stream is a stream composed only of data for only the target program, and the amount of effective information occupying in the stream is reduced.

By the process of reducing the amount of information, data gaps are generated at random in the stream.
Inside the digital VTR interface 7 or digital VT
On the R side, buffer a sufficient amount of data in the stream,
Simply expanding the time axis of the buffered data fills a somewhat random data gap. As a result, the bit rate of the transport stream decreases, and the digital VTR having a narrow recording band for home use.
In addition, the recording of the transport stream becomes possible. Although the case of replacing the PAT and PMT has been described here, the type of the packet to be replaced is not limited to this. Further, the types of packets to be replaced that can be set in the replacement data storage unit are not limited to two.

(Embodiment 2) Also, in Embodiment 1 described above.
In the above description, only the device in which replacement data is set in the replacement data storage unit and a TS packet including replacement data is newly assembled when a packet to be replaced is input has been described. It is also possible to store a replacement packet itself and omit the packet assembling unit.

FIG. 4 is a block diagram showing a packet output circuit which is a component of the packet processing apparatus according to the second embodiment of the present invention and corresponds to the inventions of claims 1, 5, 7, and 11 of the present invention. This packet output circuit is used as the packet output circuit in the transport stream packet processing device of FIG. 1, similarly to the circuit of FIG. 2 in the first embodiment.

In FIG. 4, the same reference numerals as those in FIG. 2 denote the same or corresponding components, and 1027 denotes the TS to be replaced.
A set of three of the packet ID of the packet and the replacement packet after replacement thereof is a replacement data storage unit set by the CPU 4 in FIG. This corresponds to table replacement table storage means for storing replacement table data indicating correspondence with a replacement packet indicating a packet after replacement has been performed on a target packet. This rewrite data storage unit 1
027 stores the following data.

[0061]

[Table 2]

In the second embodiment shown in FIG. 4, the packet assembling unit shown in FIG. 2 is omitted. Therefore, when the input packet corresponds to the packet to be replaced by the packet replacing unit 1024 alone, the replacement table A packet output unit 1020 that reads the replacement packet with reference to data, replaces the replacement target packet with the replacement packet, and outputs the input packet if the input packet is not the replacement target packet, outputs the input packet as it is. Make up.

Next, the operation of FIG. 4 will be described. The selected transport stream input input to the packet output circuit 102 is input to the packet determination unit 1022. If the input TS packet is TSP video 1 or TSP audio 1, it does not match any of the packet IDs set as replacement target packet IDs in the replacement data storage unit 1027. Output as is. On the other hand, if the input TS packet is a TSP-PAT, the packet determination unit 1022 determines that the TS
It is detected that the packet ID matches the packet ID of the P-PAT. This coincidence information is transmitted to the replacement data storage unit 1027. The replacement data storage unit 1027 stores the TSP-P
New PAT set corresponding to AT packet ID
Is read out. The TS packet read here is referred to as TSP-new PAT (PN). TSP-New PA
T is input to the packet replacement unit 1024. The packet replacement unit 1024 is notified from the packet determination unit 1022 that the input TS packet matches one of the replacement target packet IDs.
Output TSP-new PAT (PN) instead of PAT. TS as transport stream input after selection
Similarly, when the P-PMT1 is input, it is replaced with the TSP-new PMT1 (PM1N) composed of the data of the new PMT1 set in the replacement data storage unit 1027 and output.

In this manner, the input transport stream shown in FIG. 5 can be output by replacing the TS packets in the input transport stream with the newly assembled TS packets only for the data that needs to be rewritten. Thus, the input transport stream is a stream composed only of data for only the target program, and the amount of effective information occupying in the stream is reduced.

At this time, the replacement packet after replacement is set in the replacement data storage unit 1027 in advance.
Since there is no need to assemble the replacement packet, the replacement process can be performed quickly, and the packet assembling unit is not required. Therefore, the random logic can be reduced by that amount, and the device can be configured at lower cost.

Note that, due to the information amount reduction processing, data gaps are generated at random in the stream.
Inside the digital VTR interface 7 or digital VT
On the R side, buffer a sufficient amount of data in the stream,
Simply expanding the time axis of the buffered data fills a somewhat random data gap. As a result, the bit rate of the transport stream decreases, and the digital VTR having a narrow recording band for home use.
In addition, the recording of the transport stream becomes possible. Although the case of replacing the PAT and PMT has been described here, the type of the packet to be replaced is not limited to this. Further, the types of packets to be replaced that can be set in the replacement data storage unit are not limited to two.

(Embodiment 3) In Embodiments 1 and 2, T
Although the device for replacing the entire S packet has been described,
In the third embodiment, an apparatus that replaces only the table data to be replaced in the TS packet to be replaced will be described. FIG. 6 shows claims 2, 4, 8,
FIG. 13 is a block diagram showing a packet output circuit corresponding to the tenth invention, which is a component of the packet processing device according to the third embodiment of the present invention. This packet output circuit is used as the packet output circuit in the transport stream packet processing device of FIG. 1, similarly to the circuit of FIG. 2 in the first embodiment.

In FIG. 6, the same reference numerals as those in FIG. 2 denote the same or corresponding elements, and 1025 denotes a packet ID of a TS packet including data to be replaced and data to be replaced indicating data after replacing data therein. Is a replacement data storage unit that is set by the CPU 4 of FIG. 1. The replacement data storage unit includes a replacement target packet indicating a packet including table data to be replaced and a replacement data packet in the replacement target table data. This corresponds to replacement data storage means for storing replacement table data indicating correspondence with replacement data indicating data after replacement has been performed on replacement target data to be replaced. Reference numeral 1022 denotes a data storage unit 1 in which TS packets constituting the selected transport stream input from the packet selection circuit 101 in FIG.
It is determined whether or not the packet ID matches one of the replacement target packet IDs set in “028”, and if they match, the table data assembling unit 1025 and the table data replacing unit 1026 are notified of the match. This is equivalent to input packet detection means for detecting whether or not the input packet is a packet including the table data to be replaced. Also, 1
025 indicates that the packet to be replaced I
D is read from the replacement data storage unit 1028, and the table data assembling unit 10 assembles table data so as to include this data.
26, when notified by the packet judgment unit 1022 that they match, replaces the table data output by the table data assembling unit 1025 with the table data in the input TS packet and outputs it. If the input packet corresponds to a packet including the table data to be replaced, the table data replacement unit outputs the input TS packet output by the packet determination unit 1022 when the packet is included. The replacement data is read out with reference to the table data, replacement table data including the replacement data is assembled, the replacement target table data is replaced with the replacement table data, and the replacement packet data is output. If not included , Constituting a packet output unit 1020 directly outputs the input packet.

Next, the operation will be described. The TS packets constituting the selected transport stream input from the packet selection circuit 101 of FIG.
At 022, a table search of the replacement data storage unit 1028 is performed, and it is determined whether or not the table corresponds to a replacement target. If it is determined that the data is applicable, the replacement is performed by reading replacement data as replacement data from the replacement data storage unit 1028, and the table including the replacement data is assembled by the table data assembling unit 1025. After that, the data is output to the outside via the table data replacing unit 1026. At that time, the corresponding table data portion of the TS packet is replaced, and replacement is performed. On the other hand, when the packet does not correspond to the replacement target, the TS packet input from the outside is
2 and output directly to the outside through the table data replacement unit 1026.

Here, N storing information for broadcasting
SIT (Selection Inform) storing information for storing TS packets containing table data called IT
ation Table). When the input transport stream shown in FIG. 7 is input, only the TS packets related to the program 1 are selected by the packet selection circuit in FIG. The following data is stored in the replacement data storage unit in the packet output circuit.

[0071]

[Table 3]

The NI in the transport stream after selection
A TS packet including T is input to the packet determination unit 1022 of the packet output circuit. If the input TS packet is TSP-NIT, the TSP-N set as the replacement target packet ID in the packet determination unit 1022
It is detected that the packet ID matches the IT packet ID. This coincidence information is transmitted to the table data assembling unit 1025. The table data assembling unit 1025 extracts the SIT data set corresponding to the TSP-NIT packet ID in the replacement data storage unit 1028, and assembles the data into the table data format. The SIT table data is input to the table data replacement unit 1026. The table data replacement unit 1026 is notified from the packet determination unit 1022 that the input TS packet matches one of the packet IDs to be replaced, and receives the TSP-NIT. In the table data replacement unit 1026, the TSP-NIT
The replacement is performed by discarding the IT table data and replacing it with the SIT table data input from the table data assembling unit 1025 instead.
Then, the TS packet in which the table data is replaced is output. Thus, the input transport stream of FIG. 7 is output as an output transport stream suitable for recording of a digital VTR.

As described above, of the TS packets in the input transport stream, only the table data stored in the TS packets that need to be rewritten can be replaced with newly assembled table data and output. Thus, the input transport stream is a stream composed only of data for only the target program, and the amount of effective information occupying in the stream is reduced. Here, the case where NIT is replaced with SIT has been described, but the type of table data to be replaced is not limited to this. Further, the type of the packet to be replaced that can be set in the replacement data storage unit is not limited to one.

(Embodiment 4) Further, in the above-described Embodiment 3, replacement data corresponding to the data after replacement is set in the replacement data storage unit, and the replacement data is newly added when the replacement target packet is input. The description has been given of the device that operates so as to assemble the replacement table data which is the table data of the above. However, it is also possible to store the replacement table data itself as the data after the replacement and omit the table data assembling unit. .

FIG. 8 is a block diagram showing a packet output circuit, which is a component of the packet processing apparatus according to the fourth embodiment of the present invention, corresponding to the second, sixth, eighth, and twelfth aspects of the present invention. This packet output circuit is used as the packet output circuit in the transport stream packet processing device of FIG. 1, similarly to the circuit of FIG. 2 in the first embodiment.

In FIG. 8, the same reference numerals as those in FIG. 2 denote the same or corresponding components, and 1029 denotes the TS to be replaced.
A set of three packet IDs of the packet and the table data to be replaced in the packet is a replacement data storage unit set by the CPU 4 in FIG. This corresponds to replacement table storage means for storing table replacement table data indicating correspondence between data and a replacement table indicating table data after replacement has been performed on the replacement target table data. The following data is stored in the rewrite data storage unit 1029.

[0077]

[Table 4]

In the fourth embodiment shown in FIG. 8, since the packet assembling unit shown in FIG. 2 is omitted, the packet replacing unit 1024 is used alone when the input packet corresponds to the packet including the table data to be replaced. Is
The replacement table data is read out with reference to the table replacement table data, and the replacement table data is replaced with the replacement table data and output. If the input packet does not include the replacement table data, the input It constitutes a packet output means 1020 for outputting a packet as it is.

Next, the operation of FIG. 8 will be described. The selected transport stream input input to the packet output circuit 102 is input to the packet determination unit 1022. If the input TS packet is TSP video 1 or TSP audio 1, it does not match any of the packet IDs set as replacement target packet IDs in the replacement data storage unit 1029. Is output as is. On the other hand, when the input TS packet is TSP-NIT,
The packet determination unit 1022 detects that the packet ID matches the packet ID of the TSP-NIT among the packet IDs to be replaced. This matching information is stored in the replacement data storage unit 1029.
Conveyed to. The replacement data storage unit 1029 stores the TSP
-New S set corresponding to NIT packet ID
Read the IT packet. The TS packet read here is referred to as TSP-new SIT. The TSP-new SIT is input to the table data replacement unit 1026. The table determining unit 1026 includes the packet determining unit 10
22, the input TS packet is replaced with the replacement target packet I.
D has been notified that it matches one of
Output TSP-new SIT instead of SP-NIT.

In this way, the input transport stream shown in FIG. 9 can be output by replacing the TS packets in the input transport stream that need to be rewritten with newly assembled TS packets. Thus, the input transport stream is a stream composed only of data for only the target program, and the amount of effective information occupying in the stream is reduced.

At this time, the replacement packet after replacement is set in the replacement data storage unit 1029 in advance.
Since there is no need to assemble a replacement packet, the replacement process can be performed quickly, and a packet assembling unit is not required. Therefore, random logic can be reduced by that amount, and the apparatus can be configured at low cost. Here, the case where the NIT is replaced with the SIT has been described, but the type of the packet to be replaced is not limited to this. Also, the type of the packet to be replaced that can be set in the replacement data storage unit is 1
It is not limited to the type.

[0082]

As described above, according to the packet processing apparatus of the first aspect of the present invention, the packet input means for sequentially inputting the packet format data as the input packet, and the object to be replaced from the input packet Packet replacement means for detecting a packet to be replaced and performing the replacement of the packet to be replaced, so that when only necessary data is output from the input packet sequence, the state of the output packet sequence is changed. By replacing the packet with the reflected packet, there is an effect that a correct output packet sequence can be obtained.

According to the packet processing apparatus of the second aspect of the present invention, the packet input means for sequentially inputting the packet format data as the input packet, and the table data to be replaced in the input packet, A table data replacement means for detecting and replacing the table data is provided, so that when only necessary data is output from an input packet sequence, a packet reflecting the state of the output packet sequence is output. By replacing, a correct output packet sequence can be obtained, and the replacement can be performed not only for the entire packet but only for the necessary table data portion.

Further, according to the packet processing device of the third aspect of the present invention, in the packet processing device of the first aspect, the packet replacement means includes a replacement target packet indicating a packet to be replaced, Replacement correspondence table data storage means for storing replacement correspondence table data indicating the correspondence between the replacement data to be replaced and the replacement target packet detection means for detecting whether or not the input packet corresponds to the replacement target packet Means, when the input packet corresponds to the replacement target packet, reads the replacement data with reference to the replacement correspondence table data, assembles a replacement packet including the replacement data, and In the replacement packet If the input packet is not the packet to be replaced, the packet output means is provided to output the input packet as it is, so that only necessary data is output from the input packet sequence. In, without storing the entire packet after replacement, only the data part that needs to be replaced can be set, and when the packet to be replaced is input, the replaced packet can be assembled and the correct packet can be output. Thus, there is an effect that a packet processing apparatus capable of reducing the amount of data to be set in the replacement table can be obtained.

According to a fourth aspect of the present invention, in the packet processing apparatus of the second aspect, the table data replacing means includes a replacement unit which indicates a packet including table data to be replaced. Replacement correspondence table data storage means for storing replacement correspondence table data indicating a correspondence between the target packet and the replaced data to be replaced with the target packet;
Input packet detection means for detecting whether or not the input packet is a packet including the replacement target table data; and, if the input packet corresponds to a packet including the replacement target table data, the replacement correspondence table data , Read the data after replacement, assemble replacement table data including the data after replacement, replace the table data to be replaced with the table data to be replaced, and output the data. If not included, a packet output means for outputting the input packet as it is is provided, so that when only necessary data is output from the input packet sequence, the entire table data after replacement is stored. Without leaving Only the data part that needs to be replaced is stored, and when a packet containing the table data to be replaced is input, the replacement table data is assembled, and the replacement table data in the input packet is replaced to obtain the correct table data. There is an effect that a packet processing device that can output the data and reduce the amount of data set in advance can be obtained.

According to the packet processing apparatus of the present invention, the packet replacement means includes a replacement target packet indicating a packet to be replaced, And a replacement correspondence table data storage means for storing replacement correspondence table data indicating the correspondence between the replacement packet to be replaced and the replacement target packet detection means for detecting whether or not the input packet corresponds to the replacement target packet. Means, when the input packet corresponds to the replacement target packet, reads the replacement packet with reference to the replacement correspondence table data, replaces the replacement target packet with the replacement packet, and outputs the replacement packet. If the input packet is If the packet is not a packet, the packet output means for outputting the input packet as it is is provided, so that when only necessary data is output from the input packet sequence, the packet can be quickly replaced. Thus, there is an effect that a packet processing apparatus capable of reducing the amount of hardware to be replaced can be obtained.

According to the packet processing apparatus of the present invention, the table data replacing means includes a replacement unit which indicates a packet including table data to be replaced. A replacement correspondence table data storage means for storing replacement correspondence table data indicating the correspondence between the target packet and the replacement table data to be replaced, and whether the input packet is a packet including the replacement target table data Input packet detecting means for detecting whether or not the input packet corresponds to a packet including the replacement target table data, reading the replacement table data with reference to the replacement correspondence table data, Table data A packet output unit that outputs the input packet as it is when the input packet is not a packet including the table data to be replaced, and outputs the input packet as it is. For example, when only necessary data is output from the server, it is possible to obtain a packet processing apparatus capable of quickly replacing table data and reducing the amount of hardware because the table data is not assembled. effective.

Further, according to the packet processing apparatus of the present invention, a packet input means for sequentially inputting packet format data as an input packet, and detecting a packet to be replaced from the input packet A packet replacement unit for performing replacement of the packet to be replaced, a packet to be replaced based on information externally specified, and a packet to be replaced that sets information on the determined replacement target packet in the packet replacement unit. Information setting means, packet extracting means for extracting a required packet to be decoded from the input packet, and memory access means for performing memory access to store the required packet in a memory prior to decoding. So enter For example, when only necessary data is output from a given packet sequence, it is possible to obtain a correct output packet sequence by replacing the output packet sequence with a packet that reflects the state of the output packet sequence. This has the effect of being ready to decode this.

According to the packet processing apparatus of the present invention, the packet input means for sequentially inputting the data in the packet format as the input packet, and the table data to be replaced from the input packet, A table data replacement means for detecting and performing replacement of the replacement target table data; and a table data replacement means for determining table data to be replaced based on information instructed from the outside; Replacement target table data information setting means to be set to
Packet extraction means for extracting a required packet to be decoded from the input packet and memory access means for performing memory access to store the required packet in a memory prior to decoding are provided. By replacing the packet with a packet that reflects the state of the column, a correct output packet sequence can be obtained, and the replacement can be performed only on the necessary table data portion instead of the entire packet.
In addition, there is an effect that required data can be taken out and ready to be decoded.

According to the packet processing device of the ninth aspect of the present invention, in the packet processing device of the seventh aspect, the packet replacement means includes a replacement target packet indicating a packet to be replaced, Replacement data storage means for storing replacement correspondence table data indicating the correspondence between replacement data to be replaced with, and replacement target packet detection means for detecting whether or not the input packet corresponds to the replacement target packet. If the input packet corresponds to the replacement target packet, the replacement data is read by referring to the replacement correspondence table data, a replacement packet including the replacement data is assembled, and the replacement target packet is Replace with the replacement packet and output In the case where the input packet is not the packet to be replaced, a packet output unit that outputs the input packet as it is is provided. Therefore, when only necessary data is output from the input packet sequence, Instead of storing the entire packet, only the data part that needs to be replaced is set, and when the packet to be replaced is input, the replacement packet can be assembled and the correct packet can be output. This has the effect of reducing the amount of data to be set and obtaining a packet processing device capable of extracting required data for decoding.

According to the packet processing device of the present invention, the table data replacing means includes a replacement unit for indicating a packet including table data to be replaced. Replacement data storage means for storing replacement correspondence table data indicating a correspondence between the target packet and the replacement data to be replaced with the replacement packet; and determining whether the input packet is a packet including the replacement target table data. An input packet detecting means for detecting, and when the input packet corresponds to a packet including the table data to be replaced, reading the data after replacement with reference to the replacement correspondence table data, and replacing the data including the data after replacement. Assemble the table data and Since the replacement target table data is replaced with the replacement table data and output, and the input packet does not include the replacement target table data, a packet output unit that outputs the input packet as it is is provided. For example, when only necessary data is output from the replaced packet sequence, only the data portion that needs to be replaced is stored without storing the entire table data after replacement, and the table data to be replaced is included. When the packet is input, the replacement table data is assembled, the replacement target table data in the input packet is replaced, and the correct table data can be output.
This has the effect of reducing the amount of data set in advance and obtaining a packet processing device capable of extracting required data for decoding.

According to the packet processing apparatus of the present invention, the packet replacement means includes a replacement target packet indicating a packet to be replaced, Table replacement data storage means for storing replacement correspondence table data indicating the correspondence between the replacement packet to be replaced and the replacement packet detection means for detecting whether the input packet corresponds to the replacement target packet If the input packet corresponds to the replacement target packet, the replacement packet is read out with reference to the replacement correspondence table data, and the replacement target packet is replaced with the replacement packet and output. If the packet is Packet output means for outputting the input packet as it is when the packet is not a packet, so that when only necessary data is output from the input packet sequence, the packet can be quickly replaced. This makes it possible to reduce the amount of hardware to be replaced and to obtain a packet processing device capable of extracting required data for decoding.

[0093] According to the packet processing apparatus of the present invention, the table data replacing means in the packet processing apparatus of the present invention, wherein the replacement target table data indicating the table data to be replaced is provided. Replacement data storage means for storing replacement correspondence table data indicating the correspondence between the replacement table to be replaced, and input packet detection means for detecting that the input packet includes the replacement target table data. If the input packet corresponds to a packet including the replacement target table data, the replacement table data is read with reference to the replacement correspondence table data, and the replacement target table data is replaced with the replacement table data. Output In the case where the input packet does not include the table data to be replaced, a packet output unit that outputs the input packet as it is is provided, so that only necessary data is output from the input packet sequence. , The table data can be quickly replaced, and the amount of hardware can be reduced because the table data is not assembled.
In addition, there is an effect that a packet processing device capable of extracting required data for decoding can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a receiving apparatus for inputting a transport stream according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a packet output circuit according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a state of transport stream replacement according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a packet output circuit according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing how a transport stream is replaced in the second embodiment of the present invention.

FIG. 6 is a configuration diagram of a packet output circuit according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing how a transport stream is replaced in the third embodiment of the present invention.

FIG. 8 is a configuration diagram of a packet output circuit according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a state of transport stream replacement in Embodiment 4 of the present invention.

FIG. 10 is an explanatory diagram showing a configuration of a transport stream.

FIG. 11 is an explanatory diagram showing a packet ID of a PAT.

FIG. 12 is an explanatory diagram showing a PMT as a PID of a packet.

FIG. 13 is an explanatory diagram showing an example of a hierarchical structure of a transport stream.

FIG. 14 is an explanatory diagram showing a packet ID of NIT.

FIG. 15 is a flowchart showing an operation of the receiving apparatus for inputting a transport stream according to the first embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 antenna 2 tuner 3 demodulator 4 CPU 5 memory 6 AV decoder 7 digital VTR interface 10 transport stream packet processing device 101 packet selection circuit 102 packet output circuit 103 data extraction circuit 104 memory access circuit 1020 packet output means 1021, 1027, 1028 , 1029 Replacement data storage unit 1022 Packet determination unit 1023 Packet assembling unit 1024 Packet replacing unit 1025 Table data assembling unit 1026 Table data replacing unit

Claims (12)

[Claims] 1. Packet input means for sequentially inputting packet format data as an input packet, and packet replacement means for detecting a packet to be replaced from the input packet and executing replacement of the packet to be replaced. A packet processing device. 2. Packet input means for sequentially inputting packet format data as an input packet, and table data replacing means for detecting table data to be replaced in the input packet and executing replacement of the table data. A packet processing device comprising: 3. The packet processing device according to claim 1, wherein said packet replacement means includes a replacement correspondence indicating a correspondence between a replacement target packet indicating a packet to be replaced and post-replacement data to be replaced. A replacement correspondence table data storage means for storing table data; a replacement target packet detecting means for detecting whether the input packet corresponds to the replacement target packet; and a case where the input packet corresponds to the replacement target packet. Reads the replacement data with reference to the replacement correspondence table data, assembles a replacement packet including the replacement data, replaces the replacement target packet with the replacement packet, and outputs the replacement packet. Target packet If not, the packet processing apparatus characterized by comprising a packet output means for outputting as the input packet. 4. The packet processing device according to claim 2, wherein said table data replacement means includes: a replacement target packet indicating a packet including table data to be replaced; and replacement data to be replaced. Replacement correspondence table data storage means for storing replacement correspondence table data indicating correspondence; input packet detection means for detecting whether the input packet is a packet including the replacement target table data; If the packet includes the target table data, the replacement data is read out by referring to the replacement correspondence table data, the replacement table data including the replacement data is assembled, and the replacement target table data is replaced. Te And it is replaced with the table data, when the input packet does not include the target table data replacement above, the packet processing apparatus characterized by comprising a packet output means for outputting as the input packet. 5. The packet processing apparatus according to claim 1, wherein said packet replacement means includes a replacement correspondence indicating a correspondence between a replacement target packet indicating a packet to be replaced and a replaced packet to be replaced. A replacement correspondence table data storing means for storing table data; a replacement target packet detecting means for detecting whether the input packet corresponds to the replacement target packet; and a case where the input packet corresponds to the replacement target packet. Reads the replacement packet with reference to the replacement correspondence table data, replaces the replacement packet with the replacement packet, and outputs the replacement packet. If the input packet is not the replacement target packet, the Output as it is Packet processing device being characterized in that a packet output unit. 6. The packet processing device according to claim 2, wherein said table data replacement means includes: a replacement target packet indicating a packet including table data to be replaced; replacement table data to be replaced; Replacement correspondence table data storage means for storing replacement correspondence table data indicating the correspondence of the above, input packet detection means for detecting whether or not the input packet is a packet including the replacement target table data, When the packet corresponds to the packet including the replacement target table data, the replacement table data is read out with reference to the replacement correspondence table data, and the replacement target table data is replaced with the replacement table data and output. Pake If bets is not a packet that contains the target table data replacement above, the packet processing apparatus characterized by comprising a packet output means for outputting as the input packet. 7. A packet input means for sequentially inputting packet format data as an input packet, a packet replacement means for detecting a packet to be replaced from the input packet and executing replacement of the packet to be replaced, A replacement target packet information setting means for determining a packet to be replaced based on the information instructed from the packet information, and setting information on the determined replacement target packet in the packet replacement means; A packet processing apparatus comprising: a packet extracting unit that extracts a packet; and a memory access unit that performs memory access to store the required packet in a memory prior to decoding. 8. A packet input means for sequentially inputting data in a packet format as an input packet, and a table data replacement means for detecting table data to be replaced from the input packet and executing replacement of the replacement target table data. Replacement table data information setting means for determining table data to be replaced based on externally instructed information, and setting information on the calculated replacement table data in the table data replacement means; and A packet processing apparatus comprising: a packet extracting means for extracting a required packet to be decoded from the packet; and a memory access means for performing memory access to store the required packet in a memory prior to decoding. . 9. The packet processing device according to claim 7, wherein said packet replacement means includes a replacement correspondence indicating a correspondence between a replacement target packet indicating a packet to be replaced and post-replacement data to be replaced. Replacement data storage means for storing table data; replacement target packet detection means for detecting whether or not the input packet corresponds to the replacement target packet; if the input packet corresponds to the replacement target packet, The replacement data is read by referring to the replacement correspondence table data, a replacement packet including the replacement data is assembled, the replacement target packet is replaced with the replacement packet, and the replacement packet is output. If not The packet processing device characterized by comprising a packet output means for outputting as the input packet. 10. The packet processing device according to claim 8, wherein said table data replacement means includes: a replacement target packet indicating a packet including table data to be replaced; and replacement data to be replaced. Replacement data storage means for storing replacement correspondence table data indicating correspondence; input packet detection means for detecting whether or not the input packet is a packet including the replacement target table data; and If the packet corresponds to a packet including data, the replacement data is read by referring to the replacement correspondence table data, replacement table data including the replacement data is assembled, and the replacement target table data is replaced with the replacement table data. And outputs replaced, when the input packet does not include the target table data replacement above, the packet processing apparatus characterized by comprising a packet output means for outputting as the input packet. 11. The packet processing device according to claim 7, wherein said packet replacement means includes a replacement correspondence indicating a correspondence between a replacement target packet indicating a packet to be replaced and a replacement packet to be replaced. Table replacement data storage means for storing table data; replacement target packet detection means for detecting whether the input packet corresponds to the replacement target packet; if the input packet corresponds to the replacement target packet, Read the replacement packet with reference to the replacement correspondence table data, replace the replacement target packet with the replacement packet, and output the replacement packet. If the input packet is not the replacement target packet, leave the input packet as it is. Output Packet processing device being characterized in that a packet output unit. 12. The packet processing device according to claim 8, wherein said table data replacement means sets correspondence between replacement target table data indicating table data to be replaced and a replacement table to be replaced with the replacement target table data. Replacement data storage means for storing replacement correspondence table data shown; input packet detection means for detecting that the input packet includes the replacement target table data; and the input packet corresponds to a packet including the replacement target table data. In this case, the replacement table data is read out with reference to the replacement correspondence table data, the replacement target table data is replaced with the replacement table data and output, and the input packet includes the replacement target table data. If not, the packet processing apparatus characterized by comprising a packet output means for outputting as the input packet.