JP3529679B2 - Recording / playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus capable of receiving and recording / reproducing a digital broadcast.

[0002]

2. Description of the Related Art In recent years, digital broadcasting for transmitting and receiving by a digital system has been started, and as a device for recording a digital broadcasting signal as a bit stream, a DV
Tape devices such as HS (Digital Tape Recorder) have been developed.

FIG. 31 is a block diagram showing such a conventional recording / reproducing apparatus.

In FIG. 31, a digital broadcast signal is input to the input terminal 1. In digital broadcasting,
The MPEG2 system has been adopted. MPE
The G2 is adapted to transmit transmission data in packet units in order to facilitate time division multiplexing of a plurality of images, voices and data. One packet is composed of the same type of data, and an identification signal indicating the type of data is added to each packet. According to the MPEG2 standard, a signal is transmitted by a transport stream (TS) whose transport unit is a transport packet (TS packet) having a length of 188 bytes.

Further, each stream such as video data and audio data is transmitted by an elementary stream (ES). A header is added to ES to add PES (Packetized
Elementary Stream Packet) Configure a packet. P
Since the ES packet is relatively large, it is transmitted by payloads of a plurality of transport packets. The PES is described in detail in ISO / IEC13818-3.

This transport stream is input to the input terminal 1. At the time of recording, the transport stream input to the input terminal 1 is supplied to the tape recording device 6 and recorded on the bitstream recording tape 7.

The transport stream input via the input terminal 1 is also given to the selection circuit 2. The selection circuit 2 selects one of the transport stream from the input terminal 1 and the transport stream reproduced from the tape recording device 6 and outputs it to the TS depacket processing unit 3.

The demultiplexing processing unit 4 of the TS depacket processing unit 3 demultiplexes the input transport stream and supplies it to the PES generating unit 5 for each packet of the same program. PES generator 5
Is a video P depending on the payload of a plurality of TS packets.
Get ES packet and voice PES packet. These video and audio PES data are supplied to the video decoder 8 and the audio decoder 9, respectively.

The video decoder 8 decodes the video PES data to obtain a video signal, and the audio decoder 9 decodes the audio PES data to obtain an audio signal. These video signals and audio signals are output via terminals 10 and 11, respectively.

As described above, the conventional recording / reproducing apparatus records the input transport stream as it is. Therefore, the recording capacity of the recording medium must be relatively large, and for this reason, a tape medium is generally used as the recording medium. However, since the tape medium is used, there is a problem that it takes a long time to feed the tape when the reproduction position is jumped, and it is difficult to perform the time shift reproduction, for example.

[0011]

As described above, in the above-mentioned conventional recording / reproducing apparatus, if a large capacity tape medium is used as the recording medium in consideration of the recording capacity, the tape feeding at the time shift reproduction or the like is performed. There was a problem that it took a long time.

Furthermore, the present invention uses a disk medium to make the shift time in time shift reproduction accurate,
It is an object of the present invention to provide a recording / reproducing apparatus capable of improving access during time shift reproduction and returning speed to normal reproduction.

Signals recorded by a conventional device for recording / reproducing encoded digital video and audio signals are:
From the first part of the signal to the part where the PCR is inserted, it is not necessary at the time of reproduction, and there is a problem that recording this part in the recording device puts pressure on the recording capacity.

Further, at the time of reproduction, it is necessary to detect PCR first. Conventionally, when trying to reproduce a recorded signal from the beginning, the PCR is in the middle of the recorded signal,
There is a problem that it takes time to read out the PCR and time to start decoding.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a recording / reproducing apparatus capable of enabling suitable access to a disk medium.

Furthermore, in the present invention, the size of the stream recorded in the recording device is reduced by recording from the PCR when recording, and at the time of reproduction, since the PCR is at the beginning of the recorded digital signal, it is instantaneous. It is an object of the present invention to propose a recording / reproducing apparatus capable of starting decoding.

[0017]

A recording / reproducing apparatus according to the present invention is supplied with a compression-encoded signal, detects a reproduction unit head of the signal, and a compression-encoded signal. Recording / reproducing means for recording and reproducing on a predetermined recording medium, management information recording means for recording time information corresponding to the beginning of the reproduction unit and information on the signal amount of the reproduction unit, and recording by the management information recording means. And a reproduction control means for judging the reproduction position of the predetermined recording medium at the time of reproduction based on the time information and the signal amount information thus obtained.

In the present invention, the input signal is recorded on a predetermined recording medium by the recording / reproducing means. The reproduction unit detecting means detects the beginning of the reproduction unit of the signal to be recorded, and the management information recording means records the time information corresponding to the beginning of the reproduction unit and the information of the signal amount of the reproduction unit, the reproduction control means. The reproduction position is determined based on the information and the information on the signal amount of the reproduction unit, and reproduction is performed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

A transport stream is input to the input terminal 1. The transport stream supports multiple programs, and at the time of decoding, a packet of a desired program can be selected from a plurality of programs transmitted in a time division manner. For this choice,
A transport packet consists of a link level header (Link Level Header) before a payload (Payload) that carries information.
ader) is added and transmitted. Of the 188 bytes of the transport packet, 4 bytes are the link level header.

The link level header is arranged a synchronization byte (sync _ byte) top, thereafter, an error indicator indicating the presence or absence of a bit error (transport packed error ind
icator), a unit start indicator (PES packet start indicator) indicating the start of the PES packet, and a transport packet priority (transp) indicating the importance of the packet.
ort priority) and PID (Pa
(cket identification), scramble control (transport scrambling control) indicating presence / absence of scramble, adaptation field control (adaptation field control) indicating presence / absence of payload, and the like, and a continuity counter (continuity counter) indicating continuity of the same PID. To be done.

The transport stream input via the input terminal 1 is input to the demultiplexing / GOP head detecting section 22 of the TS depacket processing section 21. The demultiplexing / GOP head detecting unit 22 demultiplexes the input transport stream, extracts only the packets corresponding to the PID designated by the user, and outputs them. The output of the demultiplexing / GOP head detecting unit 22 is a partial transport stream (partial transport stream), and this output is supplied to the recording device 26, and also the PES generating unit 5 via the selection circuit 2. Will also be supplied.

Demultiplex / GOP head detector 22
When displaying a program based on the transport stream input to the recording / reproducing control unit 29,
To select the output of the demultiplex / GOP head detecting unit 22. As a result, the desired video and audio packet data included in the input transport stream is P
It is supplied to the ES generation unit 5.

The PES generator 5 is a PI designated by the user.
The video and audio packets corresponding to D are input, and the video and audio PES data is generated by the payload data of the plurality of transport packets. The video PES data is supplied to the video decoder 8, and the audio PES data is supplied to the audio decoder 9.

The video decoder 8 and the audio decoder 9 are respectively provided with the output of an STC counter 25, which will be described later, and the decoding time is controlled by this STC and the PTS in the input stream to input the input video or The audio PES data is decoded, and the decoded video signal and audio signal are output. The video signal from the video decoder 8 is given to the monitor display control unit 24. The monitor display control unit 24 is controlled by a recording / reproducing control unit 29, which will be described later, performs conversion processing for displaying the video signal and outputs the video signal to a monitor (not shown). The output audio signal of the audio decoder 9 is supplied to a device such as a speaker (not shown). Thus, the video of the program desired by the user can be viewed in the transport stream input through the input terminal 1.

The recording / reproducing control unit 29 is supplied with an operation signal based on a user operation. The recording / reproducing control unit 29 is configured to set various modes including a recording mode, a normal reproducing mode, and a time shift reproducing mode based on the operation signal. The recording / reproducing control unit 29 controls the demultiplex / GOP head detecting unit 22 to execute the recording mode process in the recording mode, and controls the recording device data demultiplexing unit 23 to execute the reproducing mode process in the reproducing mode. Let it run.

Demultiplex / GOP head detector 22
In the recording mode, extracts only the packet corresponding to the PID whose recording is designated based on the user operation, and outputs the bit stream of the extracted packet to the recording device 26. In addition, the demultiplex / head detection unit 22
Stores the PCR (Program Clock Reference) value at the GOP (Group of Picture) head timing in the recording device 2.
It is designed to output to 6.

PCR packets are inserted in the stream at certain intervals and serve as a time reference for the stream. MPE
In the G2 standard, intra-frame coded data (I
Picture). Compared to the cycle of this GOP, P
The CR cycle is sufficiently short, and it can be considered that the predetermined PCR insertion timing and the GOP start timing are substantially coincident with each other, ignoring the error. Therefore, the PCR value near the GOP start timing can be used as time information indicating the GOP start timing.

The recording / reproducing control unit 29 determines that the packet at the head of the GOP among the packets to be recorded is demultiplexed / GO.
When the P head detection unit 22 detects that the packet is demultiplexed, the counter variable indicating the number of transfer packets for each GOP is reset to 0, and the following variables are incremented for each packet demultiplexed to the next GOP head. Count the number of packets up to. Recording / playback control unit 29
Outputs information on the number of GOP packets to the recording device 26.

The recording device 26 uses the demultiplex / GOP head detecting section 2 as a bit stream file 28.
A file composed of the partial transport stream demultiplexed by 2 is stored. The recording device 26 stores, as a bitstream file 28 in the recording device 26, a partial transport stream of only a desired program having a PID designated by the user.

Further, the recording device 26 stores, as a table file 27 in the recording device 26, time information indicating the GOP head timing and information on the number of GOP packets. As the time information indicating the GOP start timing, for example, the PCR value of the GOP start timing is used.

In the recording device 26 of the present invention, instead of using the PCR value as the time information, for example, the time information included in the recording / reproducing control unit 29, that is, the OS (operating system) or the clock device inside the device is used. And the like. Furthermore, P, which is the time stamp value added to the video or audio bit stream
It may be a value of TS or DTS. Further, instead of the information on the number of packets of GOP, the information on the number of bytes (bits) of GOP may be stored.

Demultiplexing unit 23 for recording device data
Under the control of the recording / reproducing control unit 29, the bit stream recorded in the recording device 26 is read out, and then demultiplexed to output packets based on the user operation to the selection circuit 2 for each type. The selection circuit 2 is controlled by the recording / reproducing control unit 29 to select either the output of the demultiplex / GOP head detecting unit 22 or the output of the recording device data demultiplexing unit 23 to select the PES generating unit. Output to 5.

Demultiplex / GOP head detection unit 22
When the input packet from the input terminal 1 first matches the PID of the PCR, the value of the matched PCR is loaded into the STC counter 25 and the counter value is set. The recording device data demultiplexing unit 23 includes a recording device 26.
When the input packet from the first matches the PID of the PCR, the value of the matched PCR is loaded into the STC counter 25 and the counter value is set. In this way, the STC counter 25 is supplied with the PCR extracted by the demultiplexing / GOP head detecting unit 22 and the recording device data demultiplexing unit 23.

The STC counter 25 counts time based on the input PCR, and the count value S
The TC is output to the video decoder 8 and the audio decoder 9.
The video and audio decoders 8 and 9 compare the STC with the PTS in the stream and control the decoding time.

It should be noted that each time the PCR packet is demultiplexed by the demultiplexing / GOP head detecting unit 22 to obtain the PCR value, the demultiplexing / G
The OP head detecting unit 22 holds the acquired latest value in an internal variable.

Next, the operation of the embodiment thus configured will be described with reference to the flowcharts of FIGS. 2 to 5, the explanatory diagrams of FIGS. 6 and 7 and the flowchart of FIG.

FIG. 2 shows the operation at the time of recording, and FIGS.
Shows the operation during reproduction, FIGS. 5 to 7 show the operation during time shift reproduction, and FIG. 8 shows the operation during special reproduction.

The operation during recording will be described with reference to FIG.

It is assumed that the recording / reproducing control unit 29 sets the recording mode in response to a user's operation signal.

First, it is determined whether or not the input packet signal input from the input terminal 1 matches the desired video PID to be recorded. Examples of packets to be recorded include PCR packets and various control packets, in addition to video and audio packets desired by the user. PI of input packet
When D matches the PID of the packet to be recorded, the demultiplexing / GOP head detecting unit 22 proceeds to the next step S
In 2, it is judged whether or not it is the head of the GOP. If the PID of the input packet does not match the PID of the packet to be recorded in step S1, the process returns to step S1. As a method of detecting the beginning of GOP, the adaptation field (ISO /
There is a method of detecting the IEC13818-1 reference) random access indicator in (random _ access _ indicator), also it is actually a method of detecting the start code of the GOP.

Demultiplex / GOP head detector 22
When the head of the GOP is detected in step S2, the recording / reproducing control unit 29 resets the variable indicating the number of packets for each GOP to 0 in step S3. The demultiplexing / GOP head detecting unit 22 gives the extracted TS packet to the recording device 26. The recording device 26 records the TS packet input from the demultiplex / GOP head detection unit 22 as a bitstream file 28. Further, the demultiplex / GOP head detecting unit 22 or the recording / reproducing control unit 29 records the time information of the GOP head, for example, the PCR value, as the table file 27 of the recording device 26.

If the head of the GOP is not detected in step S2, the recording / reproducing control unit 29 determines in step S10 whether recording has already started. If recording has not started, the process returns to step S1.

On the contrary, if the recording is started in step S10, the process proceeds from step S10 to step S4, and the recording / reproducing control unit 29 increments the variable indicating the number of packets for each GOP. Further, the demultiplexing / GOP head detecting unit 22 gives this TS packet to the recording device 26 and sends it to the bitstream file 2
Record as 8.

When the head of the next GOP is detected in step S2, the recording / reproducing control unit 29 records the number of packets and time information for each GOP as the table file 27 of the recording device 26 in step S3.

Thereafter, the same operation is repeated to record only the desired TS packet based on the user operation as the bit stream file 28, and the time information of the GOP head timing and the information of the number of GOP packets are recorded as the table file 27. To do. Note that P corresponding to each stream recorded as the bitstream file 28
The ID value is also recorded as the table file 27.

As described above, as the time information recorded as the table file 27, the value of the clock of the receiver or the OS may be used. When using PCR, the disc continuous tee indicator (discontinuity _ indic packet containing PCR in the GOP period
ator) (A flag that becomes active when the counters for packets with the same PID value become discontinuous. ISO / IEC13818-3
reference. ) Becomes 1, or when the PID to be demultiplexed is changed by the operation signal such as the user channel switching signal and the PCR value becomes discontinuous, the PCR value at that time is also stored in the table file 27. Try to write.

Further, when it is necessary to multiplex the data packet describing the control data for indicating the discontinuity at the discontinuity point into the bit stream file 28, the demultiplex / GOP head. The detection unit 22 multiplexes the data packet and records it in the bitstream file 28.

By the above operation, the bit stream file 28 and the table file 27 in which the number of packets for each GOP and the PCR value are described can be recorded in the recording device 26. Thus, the video and audio bitstreams of the program selected by the user can be recorded.

When a plurality of programs are recorded in this recording operation, a plurality of video, audio and PCR PIDs are designated for demultiplexing processing, and a table file is generated and recorded for each program. To do so.

At the time of recording, in addition to PCR, video and audio data, section data called PAT and PMT (see ISO / IEC13818-1) are recorded at the same time. PAT
Describes the PID value of the PMT existing for each channel, and the PMT describes the PCR of the program, and the PID values of video and audio. Therefore, PAT and P
Video and audio can be reproduced by acquiring MT. During recording, the recording these PAT and PMT in the bit stream file 28, PCR in the table file 27, instead of the PID values of video and audio, program number (program _ number The) value that represents the channel number (service ID Be recorded).

As described above, in the present embodiment, G
Recording is started from the beginning of the OP. if,
If recording is not started from the beginning of the GOP, unreproducible data up to the beginning of the GOP will be recorded wastefully.
In the currently widely used digital broadcasting, 1 GOP is usually composed of 15 pictures, and in the current television system, 30 frames of images are transmitted per second. Therefore, if it is not recorded from the beginning of the GOP, the maximum is about 0. It takes 5 seconds to get to the beginning.

Next, the processing during normal reproduction will be described. There are two methods for normal reproduction processing control shown in FIGS. 3 and 4.

First, the example of FIG. 3 will be described. At the start of reproduction, the recording / reproduction control unit 29 sets PCR, video and audio P
The ID value is read from the table file 27, the PID value is acquired, and is set in the recording device data demultiplexing unit 23. The recording / reproduction control unit 29 determines the PI of the first PCR.
The PCR value in the packet that matches D is STC counter 2
Set to 5.

Next, the video decoder 8 and the audio decoder 9
Check the free space of the buffer. Video decoder 8
The audio decoder 9 has an STD buffer that holds the input PES data, and outputs a free space signal indicating the free space of this STD buffer to the recording / playback control unit 29.

The recording / reproducing control unit 29, in step S5,
It is determined whether or not the STD buffer has a free space based on the free space signal. As a result of this determination, if there is no free space, the process returns to step S5 again, and if there is a free space, at step S6,
The bitstream is read from the bitstream file 28, and the demultiplexing unit 23 for recording device data is read.
Transfer to.

Demultiplexing unit for recording device data 23
Demultiplexes the input bit stream and supplies it to the selection circuit 2. In this case, the selection circuit 2 has selected the output of the recording device data demultiplexer 23, and the reproduced packets are PES for each type.
It is supplied to the generation unit 5. The PES generator 5 generates video PES data and audio PES data from the input packet and supplies them to the video decoder 8 and the audio decoder 9, respectively. Then, the procedure returns to the free space check routine of step S5, and the same processing is repeated.

The process after decoding is the same as that described above.

When PAT and PMT are also recorded, the recording device data demultiplexing unit 23
By reading the program number value from the table file 27, the PAT data is used to determine the PMT PID.
Figure out. Next, the PID of the PMT is set in the demultiplexing unit for recording device data to obtain the PMT, and the PM
The PID values of PCR, video and audio are acquired from the data in T. The other processes are the same as those described above.

Next, another example of reproduction control will be described with reference to FIG. In FIG. 3, the reading from the bitstream file 28 is controlled based on the free space of the STD buffer. On the other hand, in FIG. 4, control is performed by the time stamp value (STC counter value).

In step S7 of FIG. 4, the recording / reproducing control unit 29 obtains the STC counter value from the STC counter 25, and then proceeds to the next step S8. The recording / reproducing control unit 29 compares the acquired STC counter value with the PCR value in the table file 27 in step S8. Actually, "acquired STC counter value"<
= "Time information value in data file"<"ST acquired
It is determined whether or not “C counter value + threshold value”, and if it does not apply, the process returns to step S7, and if it does apply, the “acquired STC counter value” in step S9.
To P in the range from to "acquired STC counter value + threshold value"
The data corresponding to the CR value is the bitstream file 2
Read from 8. That is, it is determined whether or not the PCR value is in the value range from the STC counter value to the predetermined threshold value, and the data corresponding to the PCR value within this range is read from the bitstream file 28 (step S9). .

The receiver (or OS) is used as the time information.
When the value of the internal clock is used, the data corresponding to the range including the time information up to the size obtained by adding the threshold value converted to this time information is read. The threshold value is a value determined by the capacity of the STD buffer.

By performing the reproduction process shown in FIG. 3 or 4, normal reproduction can be performed without overflow or underflow of the STD buffer.

Further, it is obvious that the bit stream can be read from the recording device 26 and decoded while the input program is recorded in the recording device 26 by simultaneously executing the recording and reproducing controls.

Next, the processing at the time shift reproduction will be described with reference to FIG. It should be noted that during time shift reproduction, recording and reproduction are executed at the same time, but the recording process is the same as the above description and will not be described. In this embodiment, during time shift reproduction, reproduction is performed from the beginning of the GOP.

When the user instructs the time shift reproduction by the operation signal and sets the shift time, the recording / reproduction control unit 2
9 changes the data to be read from the designated shift time in step S11. That is, the recording / reproducing control unit 29
When the time information in the table file 27 is the clock time inside the receiver (or OS), the shift time is added to the time information corresponding to the data being currently reproduced (the time of the data to be shifted and reproduced (shift). The previous time) is calculated.

Next, in step S12, the table file 27 is searched for time information having a value closest to the shift destination time, and the number of packets up to the searched time information is searched based on the information of the number of packets for each GOP. That is, the number of packets up to the GOP head packet which is the shift destination is calculated.

On the other hand, when the time information in the table file 27 is the PCR value, the recording / reproducing control unit 29 calculates the number of packets corresponding to the time shift time based on the STC count value in step S11. That is, the recording / reproducing control unit 29 acquires the STC counter value corresponding to the data being displayed in step S11 of FIG.

Next, in step S12, the recording / reproducing control unit 29 calculates the STC counter value of the shift destination from the acquired STC counter value and shift time, and searches the table file 27 for the PCR value closest to the counter value. Then, the number of packets up to the searched PCR value, that is, the number of packets up to the head of the GOP which is the shift destination is calculated.

In the next step S13, when the recording device 26 is a hard disk, the file pointer is moved, and when the recording device 26 is an optical disk, the pickup is moved by the calculated number of packets to start reading the file. After the start of reading, data transfer is performed according to the reproduction control method of FIG. 3 or 4 described above.

In the present embodiment, when recording, GO
Since the recording is started from the head of P, the reproduction can be started immediately after the shift at the time of the shift reproduction.

In some cases, the PCR value is used as the time information and the discontinuity indicator is 1 up to the shift destination, or there is channel switching up to the shift destination. In these cases, the shift time up to the discontinuous PCR value is calculated and subtracted from the total shift time. Next, the STC counter value of the shift destination is calculated from the subtraction result time and the search is performed, and the number of packets up to that value is calculated. Even when PCR discontinuity occurs, the number of packets up to the shift destination can be reliably acquired by performing such processing.

Further, in the present embodiment, the shift time at the time shift reproduction can be displayed. That is, the recording / reproducing control unit 29 calculates the shift time from the time information value corresponding to the data currently being recorded and the time information value of the shift destination. The recording / reproduction control unit 29 outputs the obtained shift time to the monitor display control unit 24. The monitor display control unit 24 outputs a video signal in which the shift time is imposed.

Further, when the shift time is displayed, the time information value at the beginning of the bit stream being recorded is also acquired, so that the shiftable time that can be shifted forward or backward can be displayed instead of displaying the shift time. It is possible. 6 shows a display example of the shift time display of FIG. 6, and FIG. 7 shows a display example of the shift available time. FIG. 6 shows that a program 10 minutes before the currently recorded program is being displayed. Further, FIG. 7 shows that it is possible to display a program from 5 minutes before to 3 minutes after the time of the currently displayed program.

Next, as an example of special reproduction for recorded data, control during fast forward / fast reverse reproduction will be described with reference to FIG.

At the time of fast forward / fast reverse reproduction, not all data but, for example, only I picture or only I and P pictures are reproduced. The recording / reproducing control unit 29 reads out and decodes the picture for each STC counter value interval determined by the shift time interval. That is, the recording / reproducing control unit 29
In step S21, the number of packets corresponding to the STC counter value interval to be shifted is acquired based on the information in the table file 27, and read at this packet number interval. In step S22, for this intermittent reading,
Move the pickup.

In the next step S23, the empty capacity signal of the STD buffer in the video decoder 8 is checked to confirm that there is an empty space. If there is no space, wait until there is space. When it is confirmed that there is a space, the recording device data demultiplexing unit 23 reads the data and performs the demultiplexing process.

In the next step S25, it is determined whether the demultiplexed data is a video packet. If it is not a video packet, there is no need to process it, so the process returns to the free space check routine of step S23. If the read packet is a video packet, the packet is given to the PES generator 5 to generate video PES data.
Next, in step S26, the PES data is supplied to the video decoder 8 and decoded.

As described above, depending on the speed of reproduction, for example, all I and P pictures in a GOP may be decoded, or only I pictures may be decoded. Therefore, the recording / reproduction control unit 29 determines the next step S
At 27, it is determined whether or not the demultiplexing processing of all the pictures to be reproduced in the GOP is completed.

For example, the end of the demultiplexing process may be determined by notifying the recording / reproducing control unit 29 of the decoding end signal of each picture from the video decoder 8, and the demultiplexing unit for recording device data 23 may be used. Recording / reproduction control unit 29 by detecting picture header
You may judge by telling.

When the reading of the picture to be reproduced in the GOP is completed, the processing shifts to step S22 to change the read destination to the head of the GOP to be reproduced next.
Move the pickup etc. If all the pictures to be reproduced in the GOP have not been read, the process returns to the free space check routine in step 23. By repeating the above operation, fast forward / fast reverse reproduction can be realized.

In the present embodiment, the number of transfer packets for each GOP is stored in the table file 27, but the total number of packets (the number of bytes (the number of bits)) is written instead of each GOP. Good.

As described above, in the present embodiment, by recording for each program, time shift reproduction is facilitated by using a disk medium having a relatively small capacity as a recording medium, and recording is performed from the beginning of the GOP during recording. By moving to the head of the GOP for reproduction during time shift reproduction, accurate and quick time shift reproduction can be performed. It is also possible to display the time shift time.

FIG. 9 is a block diagram showing another embodiment of the present invention. 9, the same components as those of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the TS depacket processing unit 31 is used.
Has an STC counter 32, which is different from the embodiment of FIG. The STC counter 32 is a demultiplexer / G
A PCR value is given from the OP head detection unit 22, and this PC
The STC is obtained by counting the R value, and the obtained STC is output to the recording / reproducing control unit 29.

In the embodiment configured as described above, the recording / reproducing control unit 29 can write the count value of the STC counter 32 in the table file 27 as the time information. Other functions are similar to those of the embodiment shown in FIG.

Therefore, in this case, it is not necessary to hold the PCR value in the demultiplex / GOP detection section 22.

It is obvious that the same effects as those of the embodiment of FIG. 1 can be obtained in this embodiment as well.

FIG. 10 is a block diagram showing another embodiment of the present invention. 10, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the embodiment of FIG. 1, the recording device 2
In 6, a transport packet is recorded as a bitstream file 28. On the other hand, the present embodiment is an example in which separate PES format files for video and audio are recorded as bitstream files.

In this embodiment, the recording device 41 uses the video bitstream file 4 as a bitstream file.
2 and the audio bitstream file 43 are different from the recording device 26 of FIG. Further, the TS depacket processing unit 45 uses the recording device PES data reading unit 46 instead of the recording device data demultiplexing unit 23, and the demultiplexing / GOP head detecting unit 22.
2 is different from the TS depacket processing unit 21 in FIG. 1 in that the PES generation unit 5 is provided between the selection circuit 2 and the selection circuit 2.

Demultiplex / GOP head detector 22
Outputs the packet data for each type to the PES generator 5. The PES generation unit 5 generates video PES data and audio PES data from the input packet data and outputs it to the selection circuit 2. In the present embodiment, the video PES data and audio PES data from the PES generator 5 are respectively recorded in the video bitstream file 42 of the recording device 41.
And an audio bit stream file 43.

Further, the recording device PES data reading section 4
6 is a video and audio P read from the video bitstream file 42 and the audio bitstream file 43.
The ES data is read and output to the selection circuit 2.

The other structure is similar to that of the embodiment shown in FIG.

Next, the operation of the embodiment thus configured will be described with reference to the flowcharts of FIGS. 11 to 14. 11 to 14 show processing flows during recording, reproduction, time shift reproduction, and fast forward / fast reverse reproduction, respectively. 11 to 14, the same steps as those in FIGS. 2 to 5 and 8 are designated by the same reference numerals and the description thereof will be omitted.

At the time of recording, as shown in FIG. 11, steps S3 'and S4' are adopted instead of steps S3 and S4, which is a difference from the operation flow of FIG. That is, at the time of recording,
The difference is that PES data is stored as the stream files 42 and 43 of the recording device 41 instead of the transport stream.

In step S2, demultiplex /
When the GOP head detecting unit 22 detects the head of the GOP,
In the next step S3 ', the variables representing the number of video data bytes and the number of audio data bytes are reset, and the number of bytes for each GOP is recorded as the table file 27 of the recording device 41. The recording / reproducing control unit 29 also stores the time information of the head of the GOP as the table file 27 of the recording device 41. The recording / reproducing control unit 29 also stores the video and audio PES data from the PES generating unit 5 as a video bit stream file 42 and an audio bit stream file 43 of the recording device 41, respectively.

If it is not the head of the GOP in step S2, the process proceeds from step S10 to step S4 '. If recording is in progress in step S10, the recording / reproducing control unit 29 causes the PES data generating unit 5 to execute the process. Video and audio P
The ES data is stored as a video bit stream file 42 and an audio bit stream file 43 of the recording device 41, respectively. Further, the recording / reproduction control unit 29 updates the variable indicating the number of video and audio data bytes for each GOP.

Thus, even in this embodiment, GO
PES data can be recorded from the beginning of P.

During reproduction, in addition to the control method by the STC counter shown in FIG. 4, as shown in FIG.
There is a method of controlling by the free space of the buffer.

In steps S31 and S33 of FIG. 12, the recording / reproducing control unit 29 determines the video and audio decoders 8, 9 based on the free capacity signals from the video and audio decoders 8, 9.
It is determined whether or not there is a free space in the video STD buffer and the audio STD buffer of No. 9. If there is a free space in the video STD buffer or the audio STD buffer, the recording device PES data reading unit 46 reads the data from the corresponding video or audio bitstream file 42 or 43 in step S32 or step S34, and the selection circuit 2 To the video or audio decoders 8 and 9 via.

Other functions are similar to those of the embodiment shown in FIG.

During time shift reproduction, the processing shown in FIG. 13 is performed. That is, first, in step S11, as in the embodiment of FIG. 1, the time information of the currently reproduced data is acquired and the time information of the shift destination is calculated. For example, the recording / reproducing control unit 29 refers to the table file from the file position of the bit stream currently being read to obtain time information of the data currently being reproduced, or ST
It is acquired from the count value of the C counter 25. The time information value of the shift destination is calculated from the acquired time value of the displayed data and the shift time.

Then, in step S12 ', the time information value closest to the calculated time information value of the shift destination is searched from the table file 27, and the data amount of the video and audio PES data up to that point is calculated, for example, in the number of bytes. To do. Next, in step S13 ', if the recording device is a hard disk, the file pointer is moved, and if the recording device is an optical disk, the pickup is moved by the number of bytes to start reading the file.

Other functions are similar to those of the embodiment shown in FIG.

Next, as an example of special reproduction, control during fast forward / fast reverse reproduction will be described with reference to FIG.

In step S21 ', the amount of data (the number of bytes) for the STC counter value interval determined from the shift time interval.
From the table file 27. Next, in step S22 ', the read destination of the video data file is moved by the acquired data amount. Reading of audio data is stopped.

Next, in step S23, the video decoder 8
It is determined whether or not there is a space in the video STD buffer, and if there is a space, the recording device PES data reading unit 46 reads the data and transfers the data to the video decoder 8 in step S41. Next, in step S42, it is judged whether or not the transfer of the picture to be reproduced in the GOP is completed. If not completed, the process returns to step S23, and if completed, the process proceeds to step S22 '. Return processing.

For example, the end of the demultiplexing process may be determined by notifying the recording / reproducing control unit 29 of the decoding end signal of each picture from the video decoder 8, and the recording device PES data reading unit 46 may also determine the end of the picture. The determination may be made by detecting the header and transmitting it to the recording / reproducing control unit 29. By repeating the above operation, fast forward / fast reverse reproduction can be realized.

FIG. 15 is a block diagram showing another embodiment of the present invention. 15, the same components as those of FIG. 10 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the TS depacket processing unit 51 is used.
Has an STC counter 52, which is different from the embodiment of FIG. The STC counter 52 is a demultiplexer /
The PCR value is given from the GOP head detection unit 22, and the P
The STC is obtained by counting the CR value, and the obtained STC is output to the recording / reproducing control unit 29.

In the embodiment configured as described above, the recording / reproducing control unit 29 can write the count value of the STC counter 52 in the table file 27 as the time information. Other functions are similar to those of the embodiment shown in FIG.

Therefore, also in this case, it is not necessary to hold the PCR value in the demultiplex / GOP detection section 22.

It is obvious that the same effects as those of the embodiment of FIG. 10 can be obtained in this embodiment as well.

FIG. 16 is a block diagram showing another embodiment of the present invention. 16, the same components as those in FIG. 10 are designated by the same reference numerals and the description thereof will be omitted.

In each of the above embodiments, the time information and the information on the number of GOP packets are stored in the table file at the time of recording. In contrast, the present embodiment PES private data (PES _ p of the PES header such information
rivate _ data) in which multiplexes and recorded in the area.

This embodiment is different from the recording device 41 of FIG. 10 in that the recording device 61 omits the table file, and the control of the recording / reproducing control unit 29 is different from the embodiment of FIG.

Next, the operation of the embodiment thus configured will be described with reference to the flowcharts of FIGS. 17 to 19. 17 to 19 show controls during recording, time shift reproduction, and fast forward / reverse reproduction, respectively. 17 to FIG. 19, FIG. 11, FIG. 13 and FIG.
The same steps as those in Step 4 are designated by the same reference numerals and the description thereof will be omitted.

Also in this embodiment, the processing of steps S1 and S2 of FIG. 17 at the time of recording is the same as that of the embodiment of FIG.

Demultiplex / GOP in step S2
When the GOP head is detected, the head detecting unit 22 supplies the PES data to the recording device 61 in step S3 ″. In this case, the PCR value held by the demultiplex / GOP head detecting unit 22 is PES. It is written in the PES private area in the PES header included in the output of the generation unit 5 and given to the recording device 61. GO in step S2.
If it is not the P head, the recording / reproducing control unit 29 determines in step S10 whether or not recording has already started. If recording has not started, the process returns to step S1.

On the contrary, when recording is started in step S10, steps S10 to S4 "
Then, the recording / reproduction control unit 29 supplies the PES data to the recording device 61. Writing the PCR value in the PES private area of the PES header is similar.

Also, when the discontinuity indicator of the packet including PCR becomes 1 during the GOP period, or the PID to be demultiplexed is changed by the operation signal such as the user channel switching signal, the PID is changed.
When the CR values become discontinuous, the PCR values at that time are also combined and written in the PES private data area.

Note that these pieces of information may be written in either the video PES stream file or the audio PES stream file. However, in order to realize special playback such as fast forward / fast reverse playback as described later,
It is better to describe in the video PES data.

Further, the bit rate for each GOP is calculated from the STC counter value and the data amount for each GOP, and is input to the recording / reproducing control unit 29.

Thus, also in this embodiment, GO
PES data can be recorded from the beginning of P.

The operation during reproduction is similar to the operation flow shown in FIG.

Next, the operation during time shift reproduction will be described with reference to FIG.

In the present embodiment, in the processing of step S11, the PC in the PES private data area is
The data amount corresponding to the time shift time is calculated from the R value and the bit rate. Next, in step S13 ″,
When the recording device is a hard disk, the file pointer is moved by the amount of the data, and when the recording device is the optical disk, the pickup is moved by the amount of the data and the reading of the file is started.

The recording device PES data reading section 46
In step S51, the PCR value of the PES private data area in the PES header is acquired from the read data. Next, in step S52, the acquired PCR
It is determined whether the value corresponds to the designated shift time. That is, the recording / reproduction control unit 29 uses the acquired PC
If the R value is a value between the counter value of the STC counter 25 and a predetermined threshold value, the process proceeds to step S14 to transfer the PES data to the video decoder 8 or the audio decoder 9.
Transfer to.

If the difference between the read PCR value and the STC value corresponding to the designated shift time is larger than the predetermined threshold value, the recording / reproducing control unit 29 causes the recording / reproducing control unit 29 to execute the step S53.
At step S13 ″, the read destination is changed from the bit rate and the difference time, and the reading of the file is started in step S13 ″.

Thereafter, steps S51 to S53 are repeated to set P
When the difference between the PCR value in the ES private data and the STC value corresponding to the shift time becomes smaller than the threshold value, the PES data is output to the video or audio decoders 8 and 9. In this way, time shift reproduction can be realized.

Next, FIG. 1 shows the control during the fast forward / fast reverse reproduction.
This will be described with reference to FIG. 19, the same steps as those in FIG. 18 are designated by the same reference numerals.

In step S61, the recording / reproduction control unit 2
9 calculates the data amount for the STC counter value interval determined from the shift time interval from the bit rate, moves the read destination of the video bitstream file 42 by the calculated data amount, and starts reading. In this case, reading of audio data is stopped. Recording device PE
The S data reading unit 46 reads the PCR value of the PES private data area in the PES header from the read data in step S51, and if the value corresponds to the designated shift time, moves the process from step S52 to step S23. To do. If the video STD buffer has a free space, the PES data read in step S41 is transferred to the video decoder 8 or the audio decoder 9.

On the other hand, when the difference between the read PCR value and the STC value corresponding to the designated shift time is larger than the predetermined threshold value, the process proceeds from step S52 to step S53, and the recording / reproducing control unit is operated. 29 changes the read destination based on the bit rate and the difference time thereof and starts reading the file (step S61).

Similarly, the processing of steps S61, S51 and S52 is repeated to perform PCR in the PES private data.
When the difference between the value and the STC value corresponding to the shift time becomes smaller than the threshold value, the process proceeds to step S23.

Other operations are the same as in FIG. In this way, fast forward / fast reverse reproduction is possible.

FIG. 20 is a block diagram showing another embodiment of the present invention. 20, the same components as those of FIG. 16 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the TS depacket processing unit 71 is used.
Has an STC counter 72, which is different from the embodiment of FIG. The STC counter 72 is a demultiplexer /
The PCR value is given from the GOP head detection unit 22, and the P
The STC is obtained by counting the CR value.

In the embodiment configured as described above, the recording / reproducing control unit 29 can write the count value of the STC counter 72 in the PES private data area as the time information. Other operations are similar to those of the embodiment shown in FIG.

Therefore, also in this case, as in the embodiment of FIG. 16, the demultiplexing / GOP detection unit 2
It is not necessary to hold the PCR value within 2.

It is obvious that the same effects as those of the embodiment of FIG. 16 can be obtained in this embodiment as well.

Although the time information is described in the PES private data area in the embodiments of FIGS. 16 and 20, it may be described in another area other than the PES private data. it is obvious.

By the way, in each of the above-described embodiments, the PCR has been described as being substantially coincident with the GOP start timing. However, in reality, PCR and GOP
The start timing may be slightly deviated, and this deficit may prevent reliable access.

Therefore, it is possible to enable accurate access by considering the difference between the GOP head timing and the PCR timing. FIG. 21 is a block diagram showing an embodiment corresponding to this case. 21, the same components as those of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

This embodiment differs from the embodiment of FIG. 1 in that a TS depacket processing section 80 having a demultiplex / GOP head PCR detection section 81 is adopted. Demultiplex / GOP head PCR detector 81
Detects the PCR immediately before the beginning of the GOP. That is, the demultiplex / GOP head PCR detection unit 81 holds the latest value and the number of recorded packets in the internal variable every time the PCR value is acquired.

The recording / reproducing control unit 29 records the PCR value immediately before the GOP head in the table file and records the number of packets between two PCR values detected immediately before the continuous GOP head. ing.

Next, the operation of the embodiment thus configured will be described with reference to FIG. FIG. 22 is a flowchart showing control at the time of recording, which corresponds to FIG.

The control at the time of recording is different from that of the embodiment of FIG. 1, as shown in step S71 of FIG. 22, in the demultiplex / GOP head PCR detector 81, the PID of the input stream becomes the PID of the PCR. When they match,
This is to perform processing for holding the number of transfer packets in another variable.

That is, demultiplex / GOP head PC
When the input packet matches the PID of the PCR, the R detection unit 81 loads the PCR value into the STC counter 25 and sets the count value, and at the same time each time the PCR packet is depacketized and the PCR value is acquired. , The latest value and the number of recorded packets are held in internal variables.

In the middle of GOP, the number of transfer packets is incremented in step S73. When the head of the GOP is detected in step S2, the PCR immediately before the head of the GOP is set as the time information value in step S72.
Describe the value in the table file. Further, the number of transfer packets up to the PCR immediately before the head of the GOP is described in the table file, and the variable indicating the number of transfer packets is reset to 0.

Thus, the table file contains the GOP
PCR immediately before the beginning of the GOP adjacent to the PCR value immediately before the beginning
Information on the number of transfer packets between each other is stored.

Controls during reproduction, time shift reproduction, fast forward / reverse reproduction, etc. are the same as those in the embodiment of FIG.

In the present embodiment, the PCR value immediately before the beginning of the GOP is used as the time information, and the number of packets between consecutive PCRs immediately before the GOP is used as the number of transfer packets. Playback can be performed from the beginning. Other effects are similar to those of the embodiment shown in FIG.

FIG. 23 is a block diagram showing another embodiment of the present invention. In FIG. 23, the same components as those in FIG. During the special reproduction shown in FIG. 8, for example, only the I picture is reproduced. In the embodiment shown in FIG. 1, the I-picture is selectively played back only by the playback side. On the other hand, in this embodiment, special reproduction or the like can be easily performed by recording information for each picture at the time of recording.

This embodiment is different from the embodiment of FIG. 1 in that a TS depacket processing section 85 provided with a demultiplex / picture head detecting section 86 is adopted.

The TS depacket processing section 85 detects the number of transfer packets, picture type and time information for each picture. The recording / reproducing control unit 29 is adapted to record these pieces of information in the table file 27.

Next, the operation of the embodiment thus configured will be described with reference to the flowcharts of FIGS. 24 and 25. 24 and 25 correspond to FIGS. 2 and 8, respectively.

In this embodiment, control during reproduction is the same as that in the embodiment of FIG. At the time of recording, as shown in FIG. 24, the demultiplex /
It is determined whether the TS packet acquired by the picture head detection unit 86 matches a desired PID such as video, audio, PCR, or the like. Demultiplex / picture head detector 8
6 transfers the TS packet when the PIDs match, and increments the counter variable indicating the number of transferred packets each time the transfer is performed (step S73).

Then, in step S81, the head of the picture is detected, and the counter variable is held in another internal variable for each detection. The beginning of the picture can be known by detecting the picture header included in the video signal. Further, the head detection of the picture may utilize payload _ unit _ start _ indicator contained in the TS header. In addition, this payload _ unit _ start _ ind
The icator is a flag that becomes "1" when the PES header of the video signal exists at the beginning of the payload of the packet of the TS. For example, in a bitstream to which a PES header is added for each picture, this flag indicates the beginning of the picture. Therefore, payload _
it is possible to detect the picture start by detecting the unit _ start _ indicator.

In step S72, the time information at the beginning of the picture and the number of transfer packets for each picture are recorded in the table file 27.

Next, the operation during time shift reproduction will be described. In time shift reproduction, the point of starting the reproduction by moving the read destination by the data amount corresponding to the desired time difference with reference to the table file 27 is the same as in the embodiment of FIG. In the present embodiment, since the information contained in the table file 27 is the transfer data amount and time information for each picture, the reproduction is started by referring to the picture type recorded together.

That is, for example, since the picture of the picture type I is at the head of the GOP, the I picture closest to the shift destination time may be searched based on the table file 27. The time shift reproduction can be realized by moving the read destination by the transfer data amount corresponding to the time difference and starting the reproduction.

At this time, if reproduction is started from the beginning of the I picture, if the PCR does not exist at the beginning of the I picture, the clock of the receiver cannot be established, so that the picture may not be displayed. . Therefore, a configuration may be considered in which the read destination is read from the picture immediately before the I picture, not from the beginning. By doing so, the clock of the receiver can be established when the beginning of the I picture is decoded, and the decoded image of the picture can be displayed.

Next, control of special reproduction such as fast forward / fast reverse will be described with reference to FIG.

When the recording / reproduction control unit 29 checks the free space signal of the buffer and confirms that there is a free space, the data is read and the demultiplexing unit 2 for the recording device data is read.
3 is the same as in the embodiment of FIG. 1 in that the packet is depacketized and decoded.

In this case, the recording / reproducing control unit 29 refers to the table file 27 and transfers only one picture. Since the transfer data amount for each picture is described in the table file 27, it is possible to obtain the number of packets corresponding to the shift time in step S82 and read the transfer data for one picture in step S83.

By doing so, it is not necessary to detect the end of picture decoding at the time of reproduction as in the embodiment shown in FIG. 1, and therefore, there is an advantage that extra data need not be read. By repeating the above operation, fast forward / fast reverse reproduction can be realized.

FIG. 26 is a flow chart showing another embodiment of the present invention. The embodiment of FIG. 26 shows a decoding operation when a DIT packet indicating a discontinuity point of the bit stream is detected when the recorded bit stream is reproduced.

According to the MPEG standard, when the stream becomes discontinuous due to the recording being stopped by the operation of the receiver, for example, a DIT packet is inserted at the discontinuous point and recording is performed.

D in the demultiplexer for recording device data
When the IT packet is detected, the recording / reproducing control unit is notified that the bit stream is discontinuous. Then,
The recording / reproduction control unit instructs the video decoder and the audio decoder to decode the counter value of the reproduction STC counter and the time stamp of the bit stream without comparing them.

When the recording device data demultiplexing unit next detects a PCR, the recording / reproducing control unit loads the value into the reproducing STC counter and restores the normal decoding state.

By performing such a reproducing operation, D
It is possible to continuously decode a bitstream in which IT exists.

FIG. 27 is a block diagram showing another embodiment of the present invention.

In this embodiment, at the time of recording, after recording is started, a packet including a PCR and a packet including a time stamp are detected, and the packet immediately before the packet including the time stamp is detected from the packet including the PCR. It is characterized by recording in a recording device.

FIG. 27 shows an encoded digital image.
It is a device that records and reproduces audio signals. This device
This is a device that records / reproduces all of the transport stream or only packets corresponding to a service selected from the transport stream. Therefore,
It is recorded in the recording device 127 in a transport stream state. Also, during reproduction, the transport stream is depacketed and decoded to be reproduced.

In FIG. 27, the transport stream is input to the selector 110 via the terminal 101.
The transport stream from the terminal 101 is, for example, a transport stream obtained by receiving and demodulating a digital broadcast, or a transport stream recorded in another recording device.

The selector 110 selects one of the transport stream input from the terminal 101 and the transport stream input from the recording device 127 according to the control signal input from the terminal 102.
TS demultiplexer 111, channel selection circuit 11
2, recording channel selection circuit 120, video PID
(PID: packet ID) filtering circuit 121,
Audio PID filtering circuit 122, PCR_
Output to the PID filtering circuit 123. The service ID of the service that the user wants to reproduce is input to the channel selection circuit 112 via the terminal 103.

The channel selection circuit 112 includes the selector 1
PS from the transport stream input from 10
By extracting and referring to I, the PID of the video signal and the audio signal included in the service corresponding to the service ID that the user wants to reproduce input from the terminal 103 is extracted and output to the TS demultiplexer 111.

The TS demultiplexer 111 extracts and depackets only the packet matching the PID from the channel selection circuit 112, and extracts the desired video signal and audio signal. The extracted signal is decoded by the MPEG decoder 113, and the decoded video signal and audio signal are displayed / reproduced on the display device 114. (Structure / Operation during recording) In addition to FIG. 27, FIG.
The configuration and operation when recording a desired service from the transport stream output from the selector 110 will be described using the time chart of FIG.

At the time of recording, the transport stream input to the terminal 101 is recorded in the recording device 127. Therefore, from the terminal 102 to the selector 110,
A control signal for outputting the transport stream input from the terminal 101 is input. The selector 110 outputs the transport stream input to the terminal 101.

FIG. 28 (6) shows the transport stream output from the selector 110. Figure 28 (6)
The transport stream output from the selector 110 shown in is input to the recording channel selection circuit 120. On the other hand, in the recording channel selection circuit 120, the service I of the service that the user wants to record from the terminal 104.
D is input. FIG. 28 (1) shows the state of service ID data input from the terminal 104.

The recording channel selection circuit 120 uses the PSI in the transport stream and the service ID input from the terminal 104 to generate a video signal, an audio signal, and a PC.
Each PID of R is obtained and output to the video PID filtering circuit 121, the audio PID filtering circuit 122, and the PCR_PID filtering circuit 123, respectively.

In this example, the PID of the video signal corresponding to the service ID "100" is "101" and the PI of the audio signal is PI.
It is assumed that D is "102" and the PID of PCR is "103".

At timing T1 shown in FIG. 28 (1), the user inputs the service ID "100" to the terminal 104. The recording channel selection circuit 120 includes the selector 11
The PSI in the transport stream from 0 is analyzed, and the video PID filtering circuit 121 has the video PID value “101” (see FIG. 28 (2)).
To the audio PID filtering circuit 122, which is the value of the audio PID “102” (FIG. 28).
(See (3)), PCR_PID filtering circuit 1
23, the PID of the PCR is “103” (FIG. 28)
(See (4)).

FIG. 28 (2) shows the output signal from the recording channel selection circuit 120 to the video PID filtering circuit 121, and FIG. 28 (3) shows the output signal from the recording channel selection circuit 120 to the audio PID filtering circuit 1.
28 (4) shows the output signal from the recording channel selection circuit 120 to the PCR_PID filtering circuit 123.

Video PID filtering circuit 121
Selects only a packet having a video PID value of “101” from the transport stream input from the selector 110, and selects the selected transport stream shown in FIG. 28 (7) as a gate 125 and a time stamp detection circuit 124. Output to.

Audio PID filtering circuit 12
Similarly, in the case of 2, the audio PID value from the transport stream input from the selector 110 is “102”.
Only the packets that are
The transport stream shown in (8) is sent to the gate 125.
And output to the time stamp detection circuit 124.

PCR_PID filtering circuit 123
Similarly, only the packet having the PCR PID value of “103” is selected from the transport stream input from the selector 110, and the selected transport stream shown in FIG. 28 (9) is output to the gate 125 and the time stamp. Output to the detection circuit 124.

Further, when the PCR_PID filtering circuit 123 detects the PID of the PCR, it outputs the signal shown in FIG. 28 (12) to the recording control circuit 126, which indicates the detection. This signal indicates the insertion position of the packet containing the PCR. As shown in FIG. 28 (12), P
The pulse is output at the timing when the packet of "103" which is the PID of the CR is detected.

The video PID filtering circuit 121,
Audio PID filtering circuit 122, PCR_
Packets (FIGS. 28 (7) to (9)) output from the PID filtering circuit 123 pass on one bus in the state shown in FIG. 28 (10) to the gate 125 and the time stamp detection circuit 124. Is entered.

In this example, it is assumed that the packet enclosed by the thick line in FIG. 28 (7) includes a time stamp. Then, the time stamp detecting circuit 124
The time stamp is detected when the packet surrounded by the thick line in (7) is analyzed, and the pulse generated at the position of the corresponding packet surrounded by the thick line is sent to the recording control circuit 126 as shown in FIG. 28 (11). Output.

A signal shown in FIG. 28 (5) by which the user permits the start of recording is input to the terminal 105. 28 T
If the recording start is permitted at the timing of 2, the terminal 1
The signal input to 05 changes from the recording prohibited state (Low level) to the recording permitted state (High level) at the timing of T2.

The recording control circuit 126 has a PCR_PID
A signal indicating the position of the packet including the PCR from the filtering circuit 123 and the time stamp detection circuit 124.
, A signal indicating the position of the packet including the time stamp, and a signal indicating the permission of the recording start input from the terminal 105 are input.

The recording control circuit 126 refers to the above three signals, detects the earliest insertion position of the packet including the PCR immediately before the packet including the time stamp after the recording start permission, and the detection result. 28 (13) is output to the gate 125.

In FIG. 28, after the recording start permission, the insertion position of the packet including the PCR immediately before the packet including the time stamp is timing T3. A packet with a time stamp is inserted at a timing T4 after the timing T3, and there is no PCR packet between the timing T3 and the timing T4. Therefore, as shown in FIG. 28 (13) of FIG. 28, a signal which becomes High at timing T3 is passed to the gate 125.

In the gate 125, based on the input signal (FIG. 28 (13)) from the recording control circuit 126, the gate 12
The output of 5 is controlled. The gate 125 keeps the video PID filtering circuit 121 and the audio PI only while the signal output from the recording control circuit 126 is High.
The transport stream (FIG. 28 (10)) output from the D filtering circuit 122 and the PCR_PID filtering circuit 123 is output to the recording device 127. Therefore, in FIG. 28, the signals after the timing T3 are output to the recording device 127 and recorded.
FIG. 28 (14) shows the transport stream output from the gate 125.

When recording is performed by the above method, the recording device 127
Will always be recorded from the packet containing the PCR. Further, between the packet including the first PCR and the packet including the second PCR of the recording device 127, there is always a packet including the time stamp.

According to this recording method, since the transport stream existing in the period from timing T2 to timing T3 shown in FIG. 28 is not recorded, the size of the recorded stream can be reduced. (Structure / Operation During Reproduction) Next, the operation when reproducing the transport stream recorded by the above-mentioned means from the recording device 127 will be described.

When the user allows the recording device 127 to reproduce the transport stream recorded by the above-mentioned means, the already recorded stream is read from the recording device 127 and input to the selector 110. Terminal 102
Since the control signal for selecting the signal from the recording device 127 is input to the selector 110, the selector 110 selects the signal read from the recording device 127, and the TS demultiplexer 1
It is input to 11. The signal depacketized by the TS demultiplexer 111 is processed by the MPEG decoder 113.
Are decoded and reproduced on the display device 114.

Here, as a procedure for decoding by the MPEG decoder 113, it is generally necessary to first extract a PCR and establish a system time clock as a reference for decoding. After that, when the video signal is decoded, the video signal to which the time stamp is added is detected, and the decoding is started at the time when the time stamp and the value of the system time clock match.

FIG. 28 (15) shows a stream read from the recording device 127. When the stream shown in FIG. 28 (15) recorded in the recording device 127 is read from the beginning and decoded, since the PCR packet is inserted at the timing T5 which is the beginning of the stream, the PCR of this packet is used. Then, the system time clock can be established immediately. Also, after this, before the packet including the PCR arrives, the timing T6
Since the packet to which the time stamp has been added in is input to the MPEG decoder 113, decoding can be started from this timing T6 position.

As described above, the time until the decoding of the transport stream read from the recording device 127 is started can be shortened.

This prevents the transport stream from being read and discarded until the packet containing the PCR is detected. In addition, even after PCR was detected, PC
Since the packet including the time stamp is input after the packet including the R is input several times, the decoding cannot be started until then, and there is no problem that it takes time to start the decoding. The time to start can be shortened.

In the above-described embodiment, the position of the packet to start recording is determined by detecting the packet including the time stamp. However, instead of the time stamp, the frame and field of the video signal (for example, MP
A packet corresponding to the beginning of a picture referred to in the EG standard),
Alternatively, the beginning of a unit of continuous frames and fields that are encoding units (for example, a sequence header according to the MPEG standard, or a GOP (Group Of)
The same effect can be obtained by detecting a packet corresponding to the header of Picture).

Further, in the above embodiment, the packet including the time stamp is detected in the video signal, but the packet including the time stamp is detected by the same means in the audio signal and the packet including the time stamp is detected. It is also possible to record in the recording device by the same means as at that time. At this time, in FIG. 27, the transport stream output from the PCR_PID filtering circuit 123 is input to the time stamp detection circuit 124, and the packet including the time stamp is detected. Further, at this time, the time stamp detection circuit 124 may detect a packet that corresponds to the beginning of the frame of the audio signal instead of the time stamp.

According to this embodiment, the amount of data recorded in the recording device can be further reduced. Also, when playing
The time to start decoding can be shortened.

FIG. 29 is a block diagram showing another embodiment of the present invention.

In this embodiment, at the time of recording, after recording is started, a packet containing PCR is detected and
The recording device is characterized by recording from a packet including R.

The configuration diagram of the embodiment shown in FIG. 29 is the same as the configuration diagram of the embodiment shown in FIG. 27 except for the recording control circuit 325, and the description thereof will be omitted. Only different points will be described.

Also, in the time chart for explaining the operation of the embodiment shown in FIG. 30, FIG.
30 to FIG. 30 (10), FIGS. 28 (1) to 28 (1)
0) and the same as FIG. 30 (11) and FIG.
8 (12) is the same.

The operation after the recording control circuit 325 will be described below.

The recording control circuit 325 has a PCR_PID
Two signals are input from the filtering circuit 323: a signal indicating the position of the packet including the PCR and a signal inputting from the terminal 305 and indicating permission to start recording. The recording control circuit 325 refers to the two signals, detects one of the insertion positions of the packet containing the PCR after permitting the recording start, and controls to start recording in the recording device after that moment. The signal shown in FIG. 30 (12) is output to the gate 324. In FIG. 30, timing T3 is the moment when PCR is detected for the first time after the start of recording is permitted. After this, FIG. 30 (12) is High. Such a signal is output to the gate 324.

The gate 324 controls the output of the gate 324 based on the signal output from the recording control circuit 325 (FIG. 30 (12)). Gate 324
Indicates that the signal output from the recording control circuit 325 is High.
Of the video PID filtering circuit 321,
Audio PID filtering circuit 322, PCR_
The transport stream (FIG. 30 (10)) output from the PID filtering circuit 323 is recorded in the recording device 32.
It outputs to 6.

Therefore, in FIG. 30, timing T3
Subsequent signals will be output to the recording device 326.
FIG. 30 (13) shows a signal output from the gate 324 to the recording device 326.

When recording is performed by the above method, the recording device 326
Will always be recorded from the packet containing the PCR. According to this recording method, since the transport stream existing in the period from the timing T2 to the timing T3 is not recorded, the size of the recorded stream can be reduced.

The operation when reproducing the transport stream recorded in this embodiment is the same as that in the previous embodiment. However, since the beginning of the packet read from the recording device 326 is a packet containing PCR,
In the MPEG decoder 313, the system time clock can be established immediately. Therefore, the time for detecting the PCR can be shortened, and the time until the start of decoding can be shortened.

FIG. 30 (14) shows a stream read from the recording device 326. When the stream shown in FIG. 30 (14) recorded in the recording device 326 is read from the beginning and decoded, a PCR packet is inserted at timing T4, which is the beginning of the stream, and therefore PCR of this packet is used. Then, the system time clock can be established immediately. Further, thereafter, the packet to which the time stamp is added at timing T5 is input to the MPEG decoder 313, so that the decoding can be started from the position of this timing T5.

As described above, it is possible to shorten the time until the start of decoding of the transport stream read from the recording device 326.

Since no unnecessary data is recorded, the amount of data recorded in the recording device 326 can be reduced.

[0220]

As described above, according to the present invention, a disk medium can be used, the shift time in time shift reproduction can be made accurate, and further, access and normal reproduction in time shift reproduction can be performed. This has the effect of increasing the speed of returning to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of FIG.

3 is a flowchart for explaining the operation of the embodiment of FIG.

4 is a flowchart for explaining the operation of the embodiment of FIG.

5 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 6 is an explanatory diagram for explaining the operation of the embodiment of FIG. 1.

FIG. 7 is an explanatory diagram for explaining the operation of the embodiment of FIG. 1.

FIG. 8 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 9 is a block diagram showing another embodiment of the present invention.

FIG. 10 is a block diagram showing another embodiment of the present invention.

FIG. 11 is a flowchart for explaining the operation of the embodiment of FIG.

12 is a flowchart for explaining the operation of the embodiment of FIG.

13 is a flowchart for explaining the operation of the embodiment of FIG.

14 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 15 is a block diagram showing another embodiment of the present invention.

FIG. 16 is a block diagram showing another embodiment of the present invention.

17 is a flowchart for explaining the operation of the embodiment of FIG.

18 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 19 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 20 is a block diagram showing another embodiment of the present invention.

FIG. 21 is a block diagram showing another embodiment of the present invention.

22 is a flow chart for explaining the operation of the embodiment of FIG.

FIG. 23 is a block diagram showing another embodiment of the present invention.

FIG. 24 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 25 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 26 is a flowchart for explaining another embodiment of the present invention.

FIG. 27 is a block diagram showing another embodiment of the present invention.

FIG. 28 is a time chart for explaining the operation of the embodiment of FIG. 27.

FIG. 29 is a block diagram showing another embodiment of the present invention.

FIG. 30 is a time chart for explaining the operation of the embodiment of FIG. 29.

FIG. 31 is a block diagram showing a conventional recording / reproducing apparatus.

[Explanation of Codes] 2 ... Selection Circuit, 5 ... PES Generator, 8 ... Video Decoder,
9 ... Audio decoder, 21 ... TS depacket processing unit, 22
Demultiplex / GOP head detecting unit, 23 ... Recording device data demultiplexing unit, 25 ... STC counter, 26 ... Recording device, 27 ... Table file, 28 ...
Bitstream file.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Natsuki Odairo 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Toshiba Yokohama Office (72) Inventor Atsushi Hirota 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Toshiba Yokohama Office (56) Reference JP-A-7-193785 (JP, A) JP-A-8-186794 (JP, A) JP-A-9-200691 (JP, A) JP-A-2000-23096 (JP, A) Registered utility model 3004104 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/91-5/956

Claims (18)

(57) [Claims] 1. A G coded by compression coding according to the MPEG system.
Transport stream with OP is input, pre
A reproduction unit detecting means for detecting the head of the GOP , a recording / reproducing means for recording and reproducing the transport stream on a predetermined recording medium, and a destination of the GOP detected by the reproduction unit detecting means.
And the signal amount of information of the time information and the GOP corresponding to the head
Both PID and service of the transport stream
Management information recording means for recording at least one of the management IDs, and the management information based on the operation information specified by the user.
Time information and signal amount information recorded by the recording means
The head of the GOP is calculated from
A recording / reproducing apparatus, comprising: a reproduction control unit that determines a reproduction position of the predetermined recording medium at the time of reproduction based on at least one of a PID of a ream and a service ID . Wherein said management information recording means, the information of the time information and the signal amount, the transport stream
Or the transport scan records the beam with different areas
2. The recording is performed by multiplexing in a stream.
The recording / reproducing apparatus described. 3. Decoding the transport stream
A decoding means for further comprising:
1. The recording / reproducing apparatus according to 1. 4. The reproduction control means of the decoding means
If there is free space in the buffer, the recording / playback means will
Providing the generated signal to said decoding means
The recording / reproducing device according to claim 3. 5. The recording / reproducing means for recording the management information.
The time information and the signal for each program recorded by the means.
The information of claim 1 is recorded, and the information of claim 1 is recorded.
Recording / playback device. 6. The information of the signal amount of the GOP is the GO information.
P packet number, byte number, bit number or coded bit
Recording / reproducing according to claim 1, characterized in that it is a rate.
apparatus. 7. The recording / reproducing means is the head of the GOP.
Recording according to claim 1, wherein recording is started from
Recording / playback device. 8. G is compressed and encoded by the MPEG system.
A transport stream with OP is input,
Reproduction unit detecting means for detecting the head of the GOP, and recording the transport stream on a predetermined recording medium.
Recording / playback means for playing back and playing, and a destination of the GOP detected by the playback unit detection means.
The time information corresponding to the head and the signal amount information of the GOP
The management information is recorded on the basis of the management information recording means and the operation information specified by the user.
Time information and signal amount information recorded by the recording means
The head of the GOP is calculated from the above, and the predetermined recording is performed at the time of reproduction.
And a reproduction control means for determining a reproduction position of the medium, wherein the time information corresponding to the head of the GOP is the MPEG information.
Included in the transport stream compressed by the method
PCR value, STC value based on the PCR value, signal processing
The clock information used for the reason, the time information set in the OS,
Transport stream compressed by MPEG method
At least one of PTS and DTS included in the system
A recording / reproducing apparatus characterized in that 9. The information on the signal amount of the GOP is the GO
P packet number, byte number, bit number or coded bit
Recording / reproducing according to claim 7, characterized in that it is a rate.
apparatus. 10. The recording / reproducing means is a destination of the GOP.
Recording according to claim 9, wherein recording is started from the head.
Recording / playback device. 11. A signal encoded by compression and having a reproduction unit.
Signal is input and the beginning of the playback unit of the signal is detected
Reproduction unit detecting means for recording the compression-coded signal on a predetermined recording medium
Recording and reproducing means for reproducing together with the reproducing unit detected by the reproducing unit detecting means.
Time information corresponding to the beginning and information on the signal amount of the reproduction unit
Information recording means for recording information and the time from the shift time to the shift destination during time shift reproduction.
Calculating information value, it is recorded in the management information recording unit
Of the calculated time information of the shift destination among the time information
Get the time information closest to and respond to this time information.
Obtained based on the signal amount information of the reproduction unit
Change the playback position of the recording medium to the beginning of the playback unit of the time information.
Recording comprising further reproduction control means
Playback device. 12. A signal encoded by compression and having a reproduction unit.
Signal is input and the beginning of the playback unit of the signal is detected
Reproduction unit detecting means for recording the compression-coded signal on a predetermined recording medium
Recording and reproducing means for reproducing together with the reproducing unit detected by the reproducing unit detecting means.
Time information corresponding to the beginning and information on the signal amount of the reproduction unit
Information recording means for recording information and the time from the shift time to the shift destination during time shift reproduction.
The information value is calculated and recorded in the management information recording means.
Of the calculated time information of the shift destination among the time information
Get the time information closest to and respond to this time information.
Obtained based on the signal amount information of the reproduction unit
Change the playback position of the recording medium to the beginning of the playback unit of the time information.
Regarding further reproduction control means and programs recorded by the recording / reproduction means
Time information obtained during recording and time information obtained during display
Shift time to calculate the difference value and display the shift time
A recording / reproducing apparatus comprising: a display unit. 13. A signal encoded by compression and having a reproduction unit.
Signal is input and the beginning of the playback unit of the signal is detected
Reproduction unit detecting means for recording the compression-coded signal on a predetermined recording medium
Recording and reproducing means for reproducing together with the reproducing unit detected by the reproducing unit detecting means.
Time information corresponding to the beginning and information on the signal amount of the reproduction unit
Information recording means for recording information and the time from the shift time to the shift destination during time shift reproduction.
The information value is calculated and recorded in the management information recording means.
Of the calculated time information of the shift destination among the time information
Get the time information closest to and respond to this time information.
Obtained based on the signal amount information of the reproduction unit
Playback position of the recording medium to the beginning of the playback unit up to the time information
And a program recorded by the recording / reproducing means.
Time information obtained during recording and time information obtained during display
Can be shifted to the future by calculating the difference value with
In addition to acquiring the time, the oldest of the program data
Difference value between the time information obtained at the time of display and the time information obtained at the time of display
Obtain the possible shift time to the past by calculating
Shift to show the possible shift time to the future and past
Recordable data, characterized by comprising a possible time display means.
Raw equipment. 14. The reproduction control means controls the special reproduction.
The speed information, the time information, and the signal amount information.
The data to be read from the recording medium based on
14. The method according to claim 11, wherein
The recording / reproducing apparatus according to any one of 1. 15. An MPEG system is compression-encoded,
A transport stream having a GOP is input,
Playback unit detecting means for detecting the head of the GOP, and recording the transport stream on a predetermined recording medium
Recording / playback means for playing back and playing, and the GOP detected by the playback unit detection means
If not, record from the packet containing the PCR value immediately before the beginning.
The recording means to start and the tip of the GOP detected by the reproduction unit detecting means
Mutual PCR values in the head and at least immediately before the head of the GOP
Based on the operation information specified by the user, and the management information recording means for recording the signal amount of
Time information and signal amount information recorded by the recording means
To the beginning of the GOP from the predetermined recording medium
And a reproduction control means for judging a reproduction position.
Recording / reproducing device for collection. 16. An MPEG system is compression-encoded,
A transport stream having a GOP is input,
Playback unit detecting means for detecting the head of the GOP, and recording the transport stream on a predetermined recording medium
Recording / playback means for playing back and playing, and a destination of the GOP detected by the playback unit detection means.
The signal amount of information of the time information及 beauty the GOP corresponding to the head
The management information is recorded on the basis of the management information recording means and the operation information specified by the user.
Time information and signal amount information recorded by the recording means
The playback position of the specified recording medium is determined based on the
Reproduction control means for disconnecting, and decoding means for decoding the transport stream
And a packet in which the time information that is the basis of the decoding is inserted
And non-inserted packets are mixed and input
When the input end and the packet from the input end become the reference of the decoding
And a recording means for recording a packet from the input end.
And said recording means, a signal for instructing recording start is input
After that, the packet in which the time information that is the reference for the decoding is inserted.
Recording / playback device characterized by starting recording from
Place 17. An MPEG system is compression-encoded,
A transport stream having a GOP is input,
Playback unit detecting means for detecting the head of the GOP, and recording the transport stream on a predetermined recording medium
Recording / playback means for playing back and playing, and a destination of the GOP detected by the playback unit detection means.
The time information corresponding to the head and the signal amount information of the GOP
The management information is recorded on the basis of the management information recording means and the operation information specified by the user.
Time information and signal amount information recorded by the recording means
The playback position of the specified recording medium is determined based on the
And a playback control unit for disconnecting the transport stream,
Payload start indicator in the header (pa
yload_unit_start_indicator) or random
Access indicator (random_access_indicator)
A recording / reproducing apparatus characterized by detecting the. 18. A compression coded by the MPEG system,
A transport stream having a GOP is input,
Reproduction unit detecting hand for detecting the beginning of the GOP Dan, Record the transport stream on a specified recording medium
Recording / reproducing means for reproducing with The tip of the GOP detected by the reproduction unit detecting means
The time information corresponding to the head and the signal amount information of the GOP
Management information recording means for recording, Based on the operation information specified by the user, the management information
Time information and signal amount information recorded by the recording means
The playback position of the specified recording medium is determined based on the
And a reproduction control means for disconnecting, The information on the signal amount of the transport stream is the total
The number of packets, bytes, or bits of
Recording / reproducing device for collection.