JP2000251402A - Digital recording and playback device - Google Patents

Abstract

(57) [Problem] To record an arbitrary TS packet from a TS in which a plurality of programs such as digital broadcasting are multiplexed,
Provided is a digital recording / reproducing apparatus capable of reproducing audio, and a digital recording / reproducing apparatus capable of outputting a recorded TS packet to an external device. A tuner / demodulation block, a TS decoder, a time code generator, a first memory controller, a first memory, and a hard disk controller.
5, hard disk drive 16, PES conversion unit 17,
Second memory control unit 18, second memory 19, time code analysis unit 20, switch block 21, AV decoder 2
2. A digital recording / reproducing apparatus A including a system controller 23 and an operation panel 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording / reproducing apparatus for recording / reproducing highly efficient encoded digital image data on a randomly accessible recording medium such as a hard disk drive.

[0002]

2. Description of the Related Art A so-called home video recorder (hereinafter, referred to as "home video recorder") used for recording a television program transmitted by a broadcasting station and enjoying it later is a typical example of a home recording device. VCR ”) is widely used. This VCR is used as follows. That is, a broadcast program transmitted by a broadcast station is received and recorded on a video tape. Then, after the recording is completed, a video tape rewind operation is performed to reproduce the recorded broadcast program.
By using in this way, for example, even a broadcast program that cannot be viewed on-time, the user can enjoy the broadcast program at his own convenience by using the VCR in this way. VCRs have spread to homes.

[0003] Recently, CS digital broadcasting, in which a plurality of digitized broadcast programs are collectively transmitted and the receiving side can select and enjoy only a desired broadcast program from among them, has been remarkably spread. STB for receiving this CS digital broadcast
The (set-top box) outputs received digital video and audio data in analog form, and also includes a TS (Transport) that includes the received digital video and audio data.
(t Stream) An interface for connecting digital data such as packets to a digital VCR, a personal computer, or the like. Therefore, recently, using this interface, data such as TS packets including received digital video and audio data is output to an external device.
More and more people are compiling digital data received with this external device for personal enjoyment.

[0004]

However, the above-mentioned VC
R and STB cannot be simultaneously recorded and played back.
Therefore, it has been desired to eliminate this disadvantage. To briefly explain this, first, in the case of a VCR, the video and audio recorded on another video tape are reproduced using the VCR in use until the recording on the video tape is completed. If the video tape being recorded is rewound and played back from the beginning, it becomes impossible to record broadcast programs from that point onward. That is, it is not possible to perform fast-forward or reverse playback of the same broadcast program already recorded at the same time while recording the broadcast program.

[0005] In the case of STB, for example, even if a plurality of digitized broadcast programs are transmitted together in one packet, one of the transmitted plurality of broadcast programs is received. It was not possible to record another broadcast program while having fun. That is, while the STB is recording the received data, the data cannot be output, and when the received data recorded by the STB is to be output to an external device, the received data is simply output as it is, and is being output. Means that the STB could not record another piece of received data, so that it takes time to record the received data and output the recorded received data to an external device, which means that work efficiency is preferable. I could not say.

Accordingly, the present invention has been made in view of such a situation, and an object of the present invention is to transmit a plurality of pieces of program information in combination, and to select and enjoy only a desired one from among the plurality of pieces of information on a receiving side. Like a CS digital broadcast, a digital broadcast that can reproduce video and audio contained in simultaneously recorded TS packets while recording arbitrary TS packets from a multiplexed TS such as a digital broadcast. An object of the present invention is to provide a recording / reproducing apparatus and a digital recording / reproducing apparatus capable of outputting a recorded TS packet to an external device.

[0007]

According to a first aspect of the present invention, there is provided a digital recording / reproducing apparatus, comprising: a receiving unit for receiving a digital broadcast; and data received by the receiving unit, the data being transmitted by an MPEG2 (Moving Picture Exposure).
erts Group Phase 2) TS (Tra
demodulation means for demodulating the data into data conforming to an Nsport Stream format, a TS decoding means for selecting an arbitrary TS packet from the data demodulated into a TS by the demodulation means, and a hard disk for transmitting the data generated by the TS decoding means. Writing means for writing to the drive device, reading means for reading data written to the hard disk drive device, and PES (Packetized) of compressed video data and compressed audio data from the data read from the hard disk drive device.
And a data analysis / conversion means for converting the compressed video / audio data into an elementary stream.
A video / audio decoding unit for decoding S into an original video / audio signal, and a control unit for controlling the operations of the above-described units as a whole are characterized.

[0008] Also, as described in claim 2, claim 1
3. The digital recording / reproducing apparatus according to claim 1, wherein time information generating means for adding time information to the TS packets selected by said TS decoding means, and time information analysis for analyzing time information of data created by said time information generating means. Means for transferring the TS packet recorded on the hard disk to another recording device is a preferred embodiment.

According to a third aspect of the present invention, in the digital recording / reproducing apparatus according to the first aspect, intra-picture coded data (I Picture) is detected from data to be recorded on the hard disk drive, and It is also a preferred embodiment to have means for creating position information of a hard disk on which data encoded in a picture is recorded, and operation means for normal reproduction, fast forward reproduction, and slow reproduction as reproduction modes.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. still,
The embodiment shown here is merely an example, and is not necessarily limited to this embodiment.

(Embodiment 1) First, an example of a digital recording / reproducing apparatus A according to the present invention will be described as a first embodiment with reference to the drawings. Here, the digital recording / reproducing apparatus A will be described as being used for recording and reproducing CS digital broadcasts.
It should be refused in advance that the program is not limited to digital broadcasting.

FIG. 1 is a block diagram of a digital recording / reproducing apparatus A used for CS digital broadcasting, and FIG.
transport Stream), PES (Pack
etized Elementary Stream
m) and ES (Elementary Stream).

Before describing the operation of the digital recording / reproducing apparatus A, an MPEG2 (Moving) will be described with reference to FIG.
Picture Experts Group Pha
The relationship between TS, PES, and ES defined in se2) will be described in advance.

In FIG. 2, 200 is ES, 210 is P
ES and 211 are PES packets, 212 is a PES header, 213 is PES packet data, 214 is a TS packet, 215 is a TS packet header, 216 is a payload, and 217 is an MPEG2 TS. In digital broadcasting, video and audio data constituting a program are compressed, and each becomes ES200.

The ES 200 is arbitrarily divided and the PES
This is stored in the PES packet data 213 in the packet 211. Further, the PES packet 211 is stored in the payload 216 of the TS packet 214 having a fixed length of 188 bytes.

Since the data amount of the PES packet 211 is arbitrarily selected, the TS packet 2 having a fixed length of 188 bytes
14 may not be able to contain one PES packet 211. In this case, one PES packet 211 is divided and stored in the payload 216 of the plurality of TS packets 214. The video and audio data of one program converted into the TS packets 214 together with the TS packets 214 containing other video, audio, and additional information constitute the MPEG2 TS 217. M
In the PEG2 TS217, a plurality of video, audio, and additional information are multiplexed in TS packet 214 units. A packet ID is described in the TS header 215 to identify the plurality of video, audio, additional information, and the like.

Based on the above, the operation of the digital recording / reproducing apparatus A according to the present invention will be described. FIG. 1 is a block diagram of a digital recording / reproducing apparatus for CS broadcasting. 10 is a tuner / demodulation block, 11 is a TS decoder, 12 is a time code generator, 13 is a first memory controller, and 14 is a first memory controller.
Memory, 15 a hard disk controller, 16 a hard disk drive, 17 a PES converter, 18 a second memory controller, 19 a second memory, 20 a time code analyzer, 21 a switch block, 22 an AV decoder, 23 Denotes a system controller, and 24 denotes an operation panel.

First, the recording operation of the digital recording / reproducing apparatus A on the hard disk drive when receiving the CS digital broadcast will be described with reference to FIG. The signal received by the CS antenna is input to the tuner / demodulation block 10. For the signal input to the tuner / demodulation block 10, one transponder frequency is selected first, and 47
After conversion into a 9.5 MHz intermediate frequency band, QPSK demodulation, and error correction, the data is output using a TS defined by MPEG2. In the TS on one transponder output from the tuner / demodulation block 10, a plurality of video, audio, and additional information are multiplexed.

The TS decoder 11 converts the TS packet of a TS in which a plurality of video, audio, and additional information input from the tuner / demodulation block 10 are multiplexed.
Performs descrambling and format analysis, and
The video / audio PES packet and additional information included in the S packet are separated.

In the TS packet separation process in the TS decoder 11, the necessity of all TS packets of the input TS is determined based on the packet ID described in the TS header 215 described with reference to FIG. Video T of the program to be recorded
S packet, audio TS packet, service information T
The S packet and the common service information TS packet are output to the time code generation unit 12 as TS packets.

When a received program is viewed in real time, the TS decoder 11 outputs a video T of the program to be viewed.
S packet, audio TS packet, service information T
After separating the S packet and the common service information TS packet, a format analysis process is performed, and the video / audio PES packet of the program to be viewed is switched to the switch block 21.
Output to As described above, a TS packet for recording and a PES packet of video / audio for viewing are output independently from the TS decoder 11.

The time code generation section 12 generates and adds a time code to a TS packet output from the TS decoder 11 for recording, using time difference between TS packets output from the TS decoder 11 as time information. This is the part to do. By adding the time code to each TS packet and recording the time code on the hard disk drive 16, the same TS code as that output from the TS decoder 11 is output.
The TS packet recorded on the hard disk drive 16 can be output to an external device at packet intervals.

As described above, the TS packet to be recorded is
The same TS output from the TS decoder 11 during recording
The output at the packet interval is the PCR in the TS packet.
(Program clock reference
This is because there is information called "extension". This PCR indicates the scheduled arrival time at the input of the system target decoder. Therefore, when the recorded TS packet data is output to the outside as it is, it is necessary to match the timing of the TS packet output from the TS decoder 11 at the time of recording.

Here, the time code generated by the time code generation unit 12 will be described with reference to FIG. FIG. 3 is an explanatory diagram of a time code added to a TS packet by the time code generation unit 12, and the time code is 8 bytes. The time code includes a 1-byte synchronization byte 301 for synchronization, a 6-byte time stamp code 302, and a 1-byte reserved byte 30.
3

The time synchronization byte 301 is indicated by the same 47h value as the TS packet synchronization byte described at the head of the TS header 214 described in FIG. Further, the time stamp code 302 corresponds to the TS shown in FIG.
The TS packet synchronization byte described at the head of the header 214 indicates the time input from the TS decoder 11 shown in FIG. 1 to the time code generation unit 12 in units of 27 MHZ. The value of the time stamp code 302 is set to 0 at the start of recording, and then increases in 27 MHZ units until the recording operation ends.

Then, the 8-byte time code generated in this way is added before the 188-byte TS packet, and is output from the time code generation unit 12 in 196-byte units.

The first memory control unit 13 includes a first memory 14
The control unit receives 196-byte data output from the time code generation unit 12, stores the data in the first memory 14, and stores the data stored in the first memory 14 according to a command of the hard disk controller 15 in the hard disk drive 16 Output to

The hard disk controller 15 has a first
The memory controller 13 and the hard disk drive 16 are controlled, and the data stored in the first memory 14 is written to the hard disk drive 16.

Next, the normal reproduction of video and audio and the external output operation of the TS packet from the TS digital broadcast TS packet and the 196-byte data consisting of the time code thus recorded on the hard disk drive 16 will be described. The description will be continued with reference to FIG.

When reading data recorded in the hard disk drive 16 from the hard disk drive 16, the hard disk controller 15 checks the free space in the second memory 19 through the second memory control unit 18, and checks the free space in the second memory 19. The data is read from the hard disk drive 16 according to. The hard disk drive 16 is controlled by the hard disk controller 15.
Is output to the PES conversion unit 17 and the second memory control unit 18.

The PES converter 17 converts the 196-byte data composed of the time code 300 and the TS packet shown in FIG. 3 created by the time code generator 12 from the data read from the hard disk drive 16. Detected by the synchronization byte 301 shown in FIG. 3 and the synchronization byte at the head of the TS header 215 shown in FIG. 2, the 8-byte time code 300 is removed, and the packet is converted into a 188-byte TS packet.

The TS packet converted in this way further analyzes the packet ID described in the TS header to identify a video / audio TS packet to be reproduced. From the identified video / audio TS packet, only the payload is extracted, converted to a part of the PES, and output to the second memory control unit 18.

The second memory control unit 18 has a second memory 19
The control unit inputs a video / audio PES packet output from the PES conversion unit 17 and data recorded in the hard disk drive 16 and stores the data in the second memory 19.

The data stored in the hard disk drive 16 stored in the second memory 19 is output to the time code analyzing unit 20, and the video / audio PES packet stored in the second memory 19 is passed through the switch block 21. , To the AV decoder 22. As described above, the video / audio PES packet and the data recorded in the hard disk drive 16 are separately output from the second memory control unit 18.

The time code analysis unit 20 receives the data recorded on the hard disk drive 16 from the second memory control unit 18, and inputs the time code 300 shown in FIG. 196 bytes of data are detected by the synchronization byte 301 also shown in FIG. 3 and the synchronization byte at the beginning of the TS header 215 shown in FIG. 2, and the 8-byte time code 300 and 188 bytes shown in FIG. Are separated into TS packets.

The time code analyzing section 20 analyzes the value of the time stamp code 302 included in the separated time code 300 and controls the output timing of the TS packet separated from the time code 300.

The TS packet output by the time code analysis unit 20 is output to an external device through the switch block 21 at the same timing as the TS packet output from the decoder 11 during recording.

The switch block 21 is composed of two switches. One is a switch that receives a TS packet output from the time code analysis unit 20 and a TS packet output from the TS decoder 11 and outputs one of the TS packets to an external device. 2 PES packet output from the memory control 18 and T
A switch that receives a PES packet output from the S decoder 11 and outputs one of the PES packets to the AV decoder 22.

When viewing the received program, the switch block 21 outputs the TS packet and the PES packet output from the TS decoder 11 to the external device and the AV decoder 22, respectively.

When normal reproduction of video and audio and external output of TS packets are performed from 196 bytes of data consisting of TS packets and time codes recorded in the hard disk drive 16, the switch block 21 transmits the TS packets from the time code analysis unit 20. The output TS packet is output to the outside, and the PES output from the second memory control 18 is output to the AV decoder 22.

The AV decoder 22 decodes the video / audio PES packet for viewing, which is input from the switch 21, and outputs it to an external television or the like. Then, the viewer of the CS digital broadcast inputs, from the operation panel 24, a program to be recorded, a program to be viewed, and a selection of data recorded in the hard disk drive 16 to be viewed. Then, the operation result of the operation panel 24 by the viewer is output to the system controller 23, and the system controller 23 totally controls each unit of the digital recording / reproducing apparatus A of the present invention in order to perform an operation desired by the viewer.

As described above, according to the digital recording / reproducing apparatus of the present invention, the PES conversion unit 17 for converting the data recorded on the hard disk drive 16 into a video / audio PES packet to be viewed is transmitted from the CS antenna. The data received from the CS antenna is recorded on the hard disk drive 16 by being provided independently of the TS decoder 11 for converting the received data into a video / audio PES packet to be viewed. Data can be reproduced, and simultaneous recording and reproduction can be performed.

That is, for example, while the viewer records the program from 10:00 to 12:00, the viewer can reproduce the program recorded from 11:00 from the beginning. Further, the viewer can view another program previously recorded on the hard disk drive 16 while recording the currently broadcasted program.

Further, by adding a time code to the TS packet recorded on the hard disk drive 16, the T packet recorded on the hard disk drive 16 is output at the timing output from the TS decoder 11 during recording.
The S packet can be output to an external device.

(Embodiment 2) Next, a digital recording / reproducing apparatus B according to the present invention, which is another embodiment different from the above-described digital recording / reproducing apparatus A, will be described as a second embodiment with reference to the drawings. explain. Here, the description will be made assuming that the digital recording / reproducing apparatus B is used for recording and reproducing CS digital broadcasts. However, it should be noted that the present invention is not necessarily limited to CS digital broadcasts.

FIG. 4 is a block diagram of the digital recording / reproducing apparatus B. 4, the same members as those of the digital recording / reproducing apparatus A shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 4, reference numeral 400 denotes an I-picture (intra-picture coded data) detection unit, and reference numeral 401 denotes an index file creation unit.

The I picture data is composed of intra-picture coded data 400, and a video can be decoded only by I picture data without using prediction between pictures in video compression. For this reason, when performing special playback such as fast forward playback and reverse fast forward playback on a video compressed by the MPEG system, a method of decoding and displaying only this I picture data is often used.

Hereinafter, the recording operation of the digital recording / reproducing apparatus B on the hard disk drive when receiving the CS digital broadcast will be described with reference to FIGS. When one program of the CS digital broadcast is recorded on the hard disk drive 16, as described in the first embodiment, 196-byte data including a TS packet for recording is stored in the first memory control unit. 13 is output.

The I-picture detection unit 400 receives 196-byte data including the TS packet output from the first memory control unit 13 and converts a part of the video PES packet based on the packet ID included in the TS header. T included
An S packet is detected, a video PES packet of a payload is analyzed, and an I picture is detected.

In the method of detecting an I picture, the start position of the I picture can be grasped by the picture coding type of the picture header included in the PES packet data of the video PES packet. The end position of the I-picture is grasped by detecting a sequence header code, a GOP (Group Of Picture) start code, a picture start code, and a sequence end code in the PES packet data of the video PES packet being analyzed. be able to.
Then, the I picture detection unit 400 detects the beginning and end of the I picture, and outputs the detection result to the index creation unit 40.
Output to 1. The index creation unit 401 creates an index such as sector information of the hard disk drive 16 where the I picture is stored.

Here, index information created by the index creating unit 401 will be described with reference to FIG. 5, reference numeral 500 denotes 16-byte index information created by the index creation unit 401 shown in FIG. 4, and reference numeral 501 denotes a 3-byte index start code indicating the head of the index information 500.
02 is a 5-byte PTS (Presentation)
503 is 4-byte start sector information, and 504 is 4-byte end sector information.

The index information 500 is information created for each I picture. The index start code 501 has the same value [0x000001] as the 3-byte start code indicating the head of the PES.
The PTS information 502 contains the P at which the head of the I picture is detected.
This is PTS information included in the ES packet. PTS
The information 502 has a value [0b001] indicating the head of the PTS information.
0], 4-bit data 520, 33-bit PTS data 521, and three 1-bit marker bits 522 of values [0], [b], and [1] inserted between the 33-bit PTS data. You.

The head sector information 503 is information indicating in which sector in the hard disk drive 16 the head of the I picture detected by the I picture detection unit 400 shown in FIG.
Reference numeral 4 denotes information indicating in which sector in the hard disk drive 16 the last of the I picture detected by the I picture detection unit 400 has been recorded. The format of the start sector information 503 and the end sector information is the same, and is composed of four 1-byte data as indicated by 510.

Reference numeral 510 denotes the format of the start sector information 503 and the end sector information 504. 50
Device / Head 511 included in the HDD 1 includes a hard disk drive and a head, and a Cylinder H.
“high512” and “Cylinder Low513” indicate the cylinder number of the hard disk drive in Sector.
Number 514 indicates the sector number of the hard disk drive, and such information is obtained from the hard disk controller 15 shown in FIG.

The index creating unit 401 records the index information created as described above on the hard disk drive 16 separately from the information including the video / audio TS packet data output from the first memory control unit.

The operation for fast-forwarding and reproducing video data recorded on the hard disk drive 16 of the digital recording / reproducing apparatus B will be described below with reference to the drawings.

When the video data recorded on the hard disk drive 16 is to be fast-forward reproduced, the hard disk controller 15 transmits the index information created by the index creating section 401 to the hard disk drive 1.
6 and detects at which address of the hard disk drive 16 the I picture of the video data to be fast-forward reproduced is recorded. Next, the hard disk controller 15 transfers only the data portion including the I picture from the video data recorded on the hard disk drive 16 to the hard disk drive 16.
Read from The data including the video TS packet read from the hard disk drive 16 is converted into a video PES packet by the PES conversion unit 17 and then transmitted to the second memory control unit 18 as described in the first embodiment. It is input to the AV decoder and displayed after video PES decoding.

As described above, the hard disk drive 16
For the data including the TS packet to be recorded in the hard disk drive, the recording position information of the hard disk in which the I picture data is recorded is created and recorded in the hard disk drive.
Special playback such as fast-forward playback and slow playback can be performed when video data in data including an S packet is played.

[0060]

According to the digital recording / reproducing apparatus of the present invention, while a digital broadcast program is received and recorded using a general-purpose hard disk drive, the recorded data portion is normally reproduced, and fast-forward reproduction and slow reproduction are performed. Special playback can be performed. Therefore, it is possible to view the recorded program without waiting for the end of the recorded program as in the case of recording / reproduction by one VCR.
Further, data recorded on the hard disk drive can be output to an external device such as a digital VCR.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital recording / reproducing apparatus according to a first embodiment.

FIG. 2 is a diagram illustrating a relationship among ES, PES, and TS.

FIG. 3 is an explanatory diagram of a time code added to a TS packet.

FIG. 4 is a block diagram of a digital recording / reproducing apparatus according to a second embodiment.

FIG. 5 is an index information format diagram of an I picture.

[Explanation of symbols]

 Reference Signs List 10 Tuner / demodulation block 11 TS decoder 12 Time stamp code generation unit 13 First memory control unit 14 First memory 15 Hard disk controller 16 Hard disk drive 17 PES conversion unit 18 Second memory control unit 19 Second memory 20 Time code analysis unit 21 Switch block 22 AV decoder 23 System controller 24 Operation panel 200 ES 210 PES 211 PES packet 212 PES header 213 PES packet data 214 TS packet 215 TS header 216 Payload 217 TS 300 Time code 301 Synchronous byte 302 Time stamp code 303 Reserve 400 I picture Detection unit 401 Index creation unit 500 Index information 501 Index start command De 502 PTS information 503 leading sector information 504 end sector information 510 sector information 511 Device / Head 512 Cylinder High 513 Cylinder Low 514 Sector Number 520 PTS information start data 521 PTS information 522 marker bits

Claims (3)

[Claims] 1. A receiving means for receiving a digital broadcast, and data received by the receiving means are stored in an MPEG2 (M
oving Picture Experts Gro
up Phase 2) TS (Transport S
a demodulator that demodulates the data into a stream that conforms to a stream format; a TS decoder that selects an arbitrary TS packet from the data demodulated by the demodulator into a TS; Writing means for writing to the device; reading means for reading data written to the hard disk drive; and PES (Pac (Pac) of compressed video data and compressed audio data from data read from the hard disk drive.
Ketized Elementary Stream
m), a video / audio decoding unit for decoding the PES of the compressed video / audio data into an original video / audio signal, and a control unit for totally controlling the operation of each unit. A digital recording / reproducing apparatus, comprising: 2. The digital recording / reproducing apparatus according to claim 1, wherein time information generating means for adding time information to the TS packets selected by the TS decoding means; and data of the data generated by the time information generating means. Digital recording / reproducing apparatus, comprising: time information analyzing means for analyzing time information; and transferring the TS packet recorded on the hard disk to another recording apparatus. 3. The digital recording / reproducing apparatus according to claim 1, wherein intra-picture encoded data (I Picture) is detected from data to be recorded on the hard disk drive, and the intra-picture encoded data is recorded. A digital recording / reproducing apparatus, comprising: means for creating the position information of the hard disk thus set; and operating means for normal reproduction, fast forward reproduction, and slow reproduction as reproduction modes.