JPH11346200A - Separation apparatus and method, and reception apparatus and method - Google Patents

Abstract

(57) [Summary] It has been difficult to realize a separating apparatus and method and a receiving apparatus and method capable of separating and extracting data efficiently. Kind Code: A1 In a separating apparatus and method, a separation condition value of a packet in which predetermined data given in advance is stored is compared with a corresponding data value of a corresponding packet included in a data stream, and a specific separation condition is determined. The packet is separated when the value and the corresponding data value of the packet do not match. Further, in the receiving apparatus and the method, a predetermined separation condition value is compared by comparing a separation condition value of a packet in which the first data is given in advance with a corresponding data value of a corresponding packet included in the data stream. When the corresponding data values of the packets do not match, the packet is separated, and the first data stored in the separated packet is used to separate the packet in which the second data is stored. I made it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separating apparatus and method, and a receiving apparatus and method, and is suitably applied to, for example, a digital broadcast system receiving apparatus and a demultiplexer used in the receiving apparatus.

[0002]

2. Description of the Related Art Conventionally, in a digital broadcasting system, a video and audio signal of each program is converted into an MPEG2 (Motion) signal on a transmitting side.
ving Picture Experts Group Phase 2) Compression encoding according to the standard, the resulting encoded data is divided into 184 bytes, and identification information (PID: Packet Identific)
ation) etc. of 4 bytes (Trasport Str
em) A header is added to make it into a 188-byte TS packet.

On the transmitting side, a TS packet for a plurality of programs obtained in this way and a PSI (Program Specif
ic information) and a TS packet storing program specification information for extracting a TS packet of a desired program and a TS packet storing adaptation field data such as PCR (ProgramCiock Reference) data. And the obtained transport stream, for example, QPSK (Quadrature Phase Shift K).
eying) Modulate and transmit as a digital transmission signal.

[0004] On the receiving side, the digital transmission signal is received and demodulated, and the TS packet of the program specified by the user included in the obtained transport stream is determined based on the PSI and the PID assigned to each TS packet. At the same time, the encoded video and audio data stored in the extracted TS packets are decoded, and the video based on the obtained video and audio data is displayed on a monitor.
Outputs audio from the speaker.

In this way, in the digital broadcasting system, the video and audio data of a plurality of programs can be multiplexed on the transmitting side and transmitted at the same time, and the desired program can be selected and viewed from these programs on the receiving side. It has been made like that.

[0006]

As a PSI in such a digital broadcasting system, each TS in which video and audio coded data and the like for each program are stored.
PMT (Program Map Table) indicating the PID of the packet
And a CAT representing a PID of a TS packet storing decryption information for descrambling in pay broadcasting.
(Conditional Access Table) and satellite orbit, polarization,
NIT (Network Information Table) showing physical information about the transmission path such as the frequency for each transponder
And a PAT (Program Association Table) indicating a PID of a TS packet in which a PMT or NIT for each program is stored.
) And so on.

[0007] These PSI data are shown in FIG. 4 according to a format called a section format.
As shown in (1), a TS packet is transmitted in the form of a signal in which a section header HD2 is added after the TS header HD1.

By the way, the section header HD2 has its T
The type of PSI stored in S packet 1 (PAT,
Table ID information D1 indicating PMT, NIT, CAT, etc.), section length information D2 indicating the data length of the PSI stored in the TS packet 1, version number information D3 indicating the version number of the PSI, and Stored are section number information D4 indicating the number of the TS packet 1 in the PSI, and last section number information D5 indicating the last section number in the PSI.

The contents of such a PSI may be changed as required (in this case, the value of the version number information D3 of the section header HD2 is incremented by 1). In the receiving device for TS, the TS packet storing the necessary PSI is always separated and extracted, and the contents are sequentially taken in.
Even when the content is updated, it can be dealt with promptly.

However, in the conventional receiving apparatus, when separating the TS packet 1 in which the desired PSI data D6 (FIG. 4) is stored, various information of the section header HD2 in the TS packet 1 detected in advance is separated. D1-D
5 are stored in advance in the memory as separation condition values, and among these information D1 to D5, for example, table number information D1 and section number information D4
Thus, the TS packet 1 in which the values of the predetermined information such as the same match are separated and extracted.

For this reason, in this type of receiving apparatus, since the separation processing is always performed on the TS packet 1 in which the desired PSI data D6 is stored, such separation processing is performed when the content is the same as the time of the previous separation. In addition to the redundant processing, the PS stored in the separated and extracted TS packet 1
Since the frequency of writing the I data D6 to the memory increases, the control unit that controls the entire receiving apparatus may interfere with reading the contents of the PSI from the memory.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a separating apparatus and method and a receiving apparatus and method capable of separating and extracting data efficiently.

[0013]

According to the present invention, in order to solve the above-mentioned problems, in a separating apparatus, a separating condition value of a packet storing predetermined data and a corresponding packet included in a data stream are provided. And a comparison / separation unit for separating the packet when the specific separation condition value and the corresponding data value of the packet do not match.

As a result, in this separation device, the corresponding packet is separated only when the specific separation condition value does not match, so that it is possible to prevent a redundant separation process from being performed.

Further, in the present invention, in the separating method, a separating condition value of a packet in which predetermined data given in advance is stored is compared with a corresponding data value of a corresponding packet included in the data stream and specified. When the separation condition value and the corresponding data value of the packet do not match, the packet is separated.

As a result, according to this separation method, the corresponding packet is separated only when the specific separation condition value does not match, so that it is possible to prevent a redundant separation process from being performed.

Furthermore, in the present invention, the receiving apparatus compares the separation condition value of the packet storing the first data provided in advance with the corresponding data value of the corresponding packet included in the data stream. A comparison / separation unit that separates a packet when a specific separation condition value and a corresponding data value of the packet do not match, based on the first data stored in the packet separated by the comparison / separation unit; And a separating means for separating a packet storing the second data from a received data stream or a data stream obtained by demodulating a transmission signal.

As a result, in this receiving apparatus, when separating the packet storing the first data, the corresponding packet is separated only when the specific separation condition value does not match, so that a redundant separation process is performed. Can be avoided beforehand.

Further, in the present invention, in the receiving method, a separation condition value of a packet storing first data stored in advance and a corresponding data value of a corresponding packet included in the data stream are compared. Receiving data based on the first step of separating the packet when the specific separation condition value and the corresponding data value of the packet do not match, and the first data stored in the separated packet. And a second step of separating a packet storing the second data from the data stream obtained by demodulating the transmitted data stream or the transmission signal.

As a result, according to this receiving method, in the first step, the corresponding packet is separated only when the specific separation condition value does not match, so that redundant separation processing is prevented from being performed. can do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of Receiving Device According to the Present Embodiment In FIG. 1, reference numeral 10 denotes a receiving device of a digital broadcasting system to which the present invention is applied as a whole, and a CPU (Centra).
l Processing Unit) 11, ROM (Read Only Memor)
y) 12, RAM (Random Access Memory) 13, tuner / digital demodulator 14, demultiplexer 15
And a decoder section 16 are connected via a bus 17.

The tuner / digital demodulator 14 is provided with a CP
Receiving the digital transmission signal S1 of the program designated by the user via the antenna 18 under the control of U11, and sequentially performing digital demodulation processing and error correction processing on the received digital transmission signal S1 To obtain the transport stream data D10 and send it to the demultiplexer unit 15.

Under the control of the CPU 11, the demultiplexer section 15 stores a TS packet storing encoded video and audio data D11 of a program designated by the user from the supplied transport stream data D10, and a predetermined packet. Storing the PSI data D6 of FIG. 4 (FIG. 4)
Packet 1 (FIG. 1) and adaptations such as PCR
The TS packet in which the field data D12 is stored is separated.

Further, the demultiplexer 25 converts the coded data D11 and PSI data D6 thus obtained.
And the adaptation field data D12 are temporarily stored in the RAM 19, and are read out at a predetermined timing to encode the encoded data D11 into an AV (Audio Video).
o) Send to the decoder section 16 and send the PSI data D6 and the adaptation field data D12 to the CPU 11 via the bus 17.

The AV decoder 16 converts the supplied encoded data D11 into the RAM 20 under the control of the CPU 11.
To obtain video data D13 and audio data D14 of the program specified by the user by sequentially decoding
The video data D13 is sent to the display processing unit 21 and
The audio data D14 is sent to the audio output processing unit 14.

The display processing section 21 performs predetermined signal processing on the supplied video data D13 to obtain a video signal S2, and sends this to a monitor (not shown) to display a video based on the video signal S2. Is displayed. The audio output processing unit 22 obtains an audio signal S3 by subjecting the supplied audio data D14 to signal processing, and outputs the audio signal S3 to a speaker (not shown) to output an audio based on the audio signal S3. Let it.

(2) Configuration of the Demultiplexer 15 The demultiplexer 15 has a configuration as shown in FIG. 2 and transport stream data D10 supplied from the tuner / digital demodulator 14 (FIG. 1). Are sequentially stored in an input FIFO (First-In First-Out) 30.

The transport stream data D10 stored in the input FIFO 30 is sequentially read out at a predetermined timing, and is read out by the TS header processing unit 31, the adaptation field processing unit 32, and the PES (Progra
m Elementary Stream) processing section 33 and a data comparing section 35 of the section processing section 34.

At this time, the RAM for the PID filter (hereinafter referred to as the PID filter RAM) 36 has
The PID of each TS packet storing the video and audio coded data D11 of the program specified by the user, which is detected by the CPU 11 based on the PAT, PMT, NIT, etc. in advance, and the PSI data D6 (see FIG. 4)
And the PID of the TS packet 1 (FIG. 4) in which
Adaptation field data D to be separated and extracted
12 and the PID of the TS packet in which
From the PU 11 to the bus 17 and the CPU interface unit 3
7 are sequentially provided, and these are stored in the corresponding storage areas of the PID filter RAM 36, respectively.

Thus, the TS header processing unit 31
A corresponding TS packet is detected based on the PID of each TS packet to be separated stored in the ID filter RAM 36 and the PID of each TS packet included in the transport stream data D10, and a control signal based on the detection result is detected. S10 is sent to the adaptation / field processing unit 32, the PES processing unit 33, and the data comparison unit 35 of the section processing unit 34, respectively.

The adaptation field processing unit 32 sequentially separates the corresponding TS packets from the transport stream data D10 based on the control signal S10 given from the TS header processing unit 31, and stores the TS packets in the TS packets. Extracted adaptation field data D12 and output it to output FI
Send to FO38.

The PES processing section 33 sequentially separates the corresponding TS packets from the transport stream data D10 based on the control signal S10 given from the TS header processing section 31, and also stores the PES stored in the TS packets. Extracting the encoded data D11 of the type,
This is sent to the output FIFO 38.

At this time, the section filter RAM (hereinafter, simply referred to as section filter RAM) 39 of the section processing section 34 stores the PSI data D6 to be separated and extracted detected by the CPU 11 in advance. Various information D1 to D such as table ID information D1 in the section header HD2 in the TS packet 1 (FIG. 4)
5 are used as separation condition values D1 'to D5' (FIG. 3C) for separating the TS packet 1, respectively.
From the PU 11 to the bus 17 and the CPU interface unit 3
7 in sequence, and these separation condition values D
1 'to D5' are RAs for the section filter, respectively.
It is stored in the storage area corresponding to M39.

Thus, based on the control signal S10 supplied from the TS header processing unit 31, the data comparison unit 35 of the section processing unit 34 supplies the transport stream supplied as shown in FIGS. Data D10
From the corresponding TS packet 1 section header HD2
Of the various information D1 to D5 stored therein, and among the detected various information D1 to D5, "No comparison" is performed in advance.
Are set as the separation conditions, the values of various information D1, D3, and D4 other than the predetermined information D2 and D5 are stored in the corresponding separation condition value D stored in the section filter RAM 39.
1 ', D3' and D4 'are compared one bit at a time.

Based on the comparison result, the data comparing unit 35 converts the values of the table ID information D1 and the section number information D4 in the section header HD2 of the detected TS packet 1 into the section filter R, respectively.
The corresponding separation condition values D1 ', D1 stored in AM39
4 ', and only when the detected value of the version number information D4 does not match the corresponding separation condition value D4' (this means that the PSI data D6 has been changed). Is transmitted to the section data output processing unit 40.

Thus, the section data output processing section 40
Is the transport stream data D10 only when the control signal S11 is given from the data comparison unit 35.
From the corresponding TS packet 1 and
The PSI data D6 (FIG. 3A) is extracted from the packet 1 and sent to the output FIFO 38.

The adaptation field data D12, the coded data D11 and the PSI data D6 given to the output FIFO 38 are read out by the memory interface unit 41 at a predetermined timing, and
While being stored in the AM 19, the encoded data D11 is thereafter read out at a predetermined timing and is
And the adaptation field data D1
2 and the PSI data D6 are the CPU interface unit 3
7 to the CPU 11 via the bus 17 sequentially.

Further, based on the PSI data D6 obtained in this way, the CPU 11 outputs a PID filter R
While the PID value of the TS packet to be separated and extracted stored in the AM 36 is changed as required, each separation condition value D stored in the section filter RAM 39 is changed.
The corresponding separation condition value D3 'among 1' to D5 'is changed.

Thus, the demultiplexer 1
5, the coded data D11 of the video and audio of the program specified by the user and the desired PSI data D6
Etc. can be separated and extracted.

(3) Operation and Effect of the Present Embodiment In the above configuration, in the receiving apparatus 10, the data comparison unit 35 of the section processing unit 34 uses the table ID of the section header HD2 in the TS packet 1 of the section format. The values of the information D1 and the section number information D4 are stored in the section filter RAM 39, respectively.
The TS packet 1 is separated only when the corresponding separation condition values D1 'and D4' stored in the RAM 19 match and the value of the version number information D3 does not match the corresponding separation condition value D3 '. To be stored.

Therefore, in this receiving apparatus 10, the desired P
Only when the SI data D6 is updated, the TS packet 1 storing the PSI data D6 is separated, so that redundant separation processing can be avoided. Only when the desired PSI data D6 is updated in this way, the TS packet 1 storing the PSI data D6 is separated and extracted and written to the RAM 19,
The frequency of writing the SI data D6 to the RAM 19 is low, and it is possible to remarkably reduce the hindrance of the CPU 11 reading the desired PSI contents from the RAM 19.

According to the above configuration, the transport stream data D10 input via the input FIFO 30
When the TS packet 1 in which the desired PSI data D6 is stored is separated, the values of the table ID information D1 and the section number information D4 in the section header HD2 of the TS packet 1 are stored in the corresponding section filter RAM 39. Match the separation condition values D1 ', D4',
Further, since the TS packet 1 is separated and extracted only when the value of the version number information D3 does not match the corresponding separation condition value D3 ', the CPU 11 stores the contents of the PSI from the RAM 19 while avoiding redundant separation processing. Obstruction in reading can be significantly reduced, and a demultiplexer and a receiver capable of efficiently separating and extracting desired PSI data can be realized.

(4) Other Embodiments In the above-described embodiment, a case has been described in which the separating apparatus according to the present invention is applied to the demultiplexer unit 15 used in the receiving apparatus 1 for a digital broadcasting system. However, the present invention is not limited to this, and a data stream in which various types of data are packetized and multiplexed in predetermined units (in this embodiment, in units of 184 bytes) (transport stream data D1 in this embodiment).
0), a receiving device for a digital broadcasting system, if it is a separating device for separating a packet (TS packet 1 in the present embodiment) storing predetermined data (PSI data D6 in the present embodiment). The present invention can be widely applied to various other separation devices other than the demultiplexer unit 15 used in the first embodiment.

In the above-described embodiment, the case has been described where the receiving apparatus according to the present invention is applied to the receiving apparatus 1 for a digital broadcasting system. However, the present invention is not limited to this, and various data A data stream (transport stream data D10 in this embodiment) which is packetized and multiplexed in units (184 byte units in this embodiment) is received, and the first data included in the data stream is received. (PSI data D6 in the present embodiment) is separated and extracted, and predetermined second data (in this embodiment, encoded data of each program is extracted from the data stream based on the separated and extracted first data). D11) is a receiving device that separates and extracts program data such as D11 and adaptation field data D12). Then, the present invention can be widely applied to other various communication or broadcasting system receiving apparatuses other than the digital broadcasting system receiving apparatus.

In this case, the present invention can be applied to, for example, a receiving apparatus for directly receiving a data stream such as a transport stream transmitted via a cable or the like.

Further, in the above-described embodiment, table ID information D composed of predetermined separation condition values D1 'to D5' and corresponding data values of corresponding TS packet 1 included in transport stream data D10.
1, section length information D2, version number information D3,
Section number information D4, final section number information D5
And the like, and when the specific separation condition value D3 'and the version number information D3 comprising the corresponding data value of the TS packet 1 do not match, the section processor 34 as a comparison / separation means for separating the TS packet 1 Has been described with reference to FIG. 2, but the present invention is not limited to this, and various other configurations can be widely applied.

Further, in the above-described embodiment, the coded data D11 of the program specified from the transport stream data D10 based on the PSI data D6 stored in the TS packet 1 separated by the section processor 34, etc. Although the demultiplexer unit 15 as the separating means for separating the TS packets storing the program data of FIG. 1 has been described with reference to FIG. 2, the present invention is not limited to this, and the present invention is not limited to this. Can be widely applied.

Furthermore, in the above-described embodiment, the table ID information D1 and the section number information of the section header HD2 are used as separation conditions when separating the TS packet 1 storing the PSI data D6 included in the transport stream data D10. The value of D4 "matches" with the corresponding separation condition values D1 'and D4', the version number information D3 "mismatches" with the corresponding separation condition value D3 ', and the section length information D2 and the last section number information D
5 has been described as "no comparison" with the corresponding separation condition D5 ', but the present invention is not limited to this, and other pattern separation conditions can be widely applied.

Further, in the above-described embodiment, the separation condition in the data comparing section 35 of the section processing section 34 of the demultiplexer section 15 is fixed (that is, the values of the table ID information D1 and the section number information D4 of the section header HD2 correspond to each other). Separation condition values D1 ', D4'
And the version number information D3 is "mismatched" with the corresponding separation condition value D3 ', and the section length information D2
And the separation condition D corresponding to the last section number information D5
5 ′ and “no comparison”), but the present invention is not limited to this case.
Under the control of the PU 11, these separation conditions such as "match", "mismatch" and "no comparison" can be freely switched in units of bits or in units of separation condition values D1 'to D5'. May be set to determine which separation condition value or its bit is to be matched or mismatched to separate the TS packet. By doing so, it is possible to widely cope with the separation of TS packets of various formats other than the section format.

[0051]

As described above, according to the present invention, in the separation device, the separation condition value for the packet storing the predetermined data given in advance and the corresponding data value of the corresponding packet included in the data stream. And compare
By providing comparison / separation means for separating the packet when the specific separation condition value and the corresponding data value of the packet do not match, it is possible to prevent redundant separation processing from being performed beforehand. Thus, a separation device capable of efficiently separating and extracting data can be realized.

Further, according to the present invention, in the separation method,
The separation condition value of a packet in which predetermined data given in advance is stored is compared with the corresponding data value of the corresponding packet included in the data stream, and the specific separation condition value and the corresponding data value of the packet do not match. By separating the packet at that time, it is possible to prevent a redundant separation process from being performed, thereby realizing a separation method capable of separating and extracting data efficiently.

Further, according to the present invention, the receiving apparatus compares the separation condition value of the packet storing the first data stored in advance with the corresponding data value of the corresponding packet included in the data stream. The comparison / separation means for separating the packet when the specific separation condition value and the corresponding data value of the packet do not match, and the first data stored in the packet separated by the comparison / separation means. And a separating means for separating the packet storing the second data from the received data stream or the data stream obtained by demodulating the transmission signal, thereby providing a redundant data when separating and extracting the first data. It is possible to prevent the separation processing from being performed beforehand, and thus it is possible to realize a receiving apparatus that can efficiently separate and extract data.

Furthermore, according to the present invention, in the receiving method, a comparison is made between a separation condition value for a packet in which first data is given in advance and a corresponding data value of a corresponding packet included in the data stream. Then, based on the first step of separating the packet when the specific separation condition value and the corresponding data value of the packet do not match, and the first data stored in the separated packet, By providing a second step for separating a packet storing the second data from a received data stream or a data stream obtained by demodulating a transmission signal, a redundant step is performed when the first data is separated and extracted. It is possible to prevent the separation processing from being performed, thereby realizing a reception method capable of separating and extracting data efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a receiving device according to the present embodiment.

FIG. 2 is a block diagram showing a configuration of a demultiplexer unit.

FIG. 3 is a conceptual diagram explaining comparison processing in a data processing unit;

FIG. 4 is a conceptual diagram showing a data format in a section format.

[Explanation of symbols]

10 receiving apparatus, 11 CPU, 15 demultiplexer, 31 TS header processing section, 32 adaptation field processing section, 33 PES processing section, 34 section processing, 35 data comparing unit, 36 RAM for PID filter, 39 RAM for section filter, 40 section data output processing unit, D1, D1 'table ID information, D2, D
2 '... section length information, D3, D3' ... version number information, D4, D4 '... section number information, D
5, D5 ': Last section number information, D6, D6'
…… PSI data, HD2 …… Section head, D1
0: transport stream data, D11: encoded data, S1: digital transmission signal.

Claims (6)

[Claims] 1. A separating apparatus for separating a packet storing predetermined data from a data stream in which various data are packetized and multiplexed in a predetermined unit, wherein the predetermined data is stored in the packet storing the predetermined data. The separation condition value is compared with the corresponding data value of the corresponding packet included in the data stream, and when the specific separation condition value and the corresponding data value of the packet do not match, the packet is determined. A separation device comprising a comparison separation means for separating. 2. The comparison / separation means, for each of the separation condition values, separates the corresponding packet contained in the data stream when the corresponding data value of the packet matches or does not match, or separates the packet. The separation device according to claim 1, wherein the separation device can be freely switched. 3. A separating method for separating a packet in which predetermined data is stored from a data stream in which various data are packetized and multiplexed in a predetermined unit, wherein the predetermined data is stored in a packet in which the predetermined data is stored. The separation condition value is compared with the corresponding data value of the corresponding packet included in the data stream, and when the specific separation condition value and the corresponding data value of the packet do not match, the packet is determined. A separation method characterized by separating. 4. A data stream in which various data are packetized and multiplexed in a predetermined unit and / or a transmission signal obtained by modulating the data stream is received, and the first data included in the data stream is separated. A receiving device for extracting and extracting predetermined second data from the data stream based on the separated and extracted first data, wherein a predetermined packet of the first data is stored. The condition value is compared with the corresponding data value of the corresponding packet included in the data stream, and when the specific separation condition value and the corresponding data value of the packet do not match, the packet is separated. Comparing and separating the first data stored in the packet separated by the comparing and separating means. Receiving apparatus characterized by, that the data stream or the transmission signal received from the data stream obtained by demodulating comprises a separating means for separating said packet to said second data is stored based on. 5. The comparison / separation means, for each of the separation condition values, separates the corresponding packet included in the data stream when the corresponding data value of the packet matches or does not match, or separates the packet. 5. The receiving device according to claim 4, wherein the receiving device can be switched freely. 6. A data stream in which various data are packetized and multiplexed in a predetermined unit and / or a transmission signal obtained by modulating the data stream is received, and first data included in the data stream is separated. In a receiving method for extracting and extracting predetermined second data from the data stream based on the separated and extracted first data, a separation method for a packet in which the predetermined first data is stored is provided. The condition value is compared with the corresponding data value of the corresponding packet included in the data stream, and when the specific separation condition value and the corresponding data value of the packet do not match, the packet is separated. A first step to be performed, and the first step stored in the separated packet.
A second step of separating the packet storing the second data from the received data stream or the data stream obtained by demodulating the transmission signal based on the data. How to receive.