JP2000041212A - Optical disk, recording device, its method, reproduction device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the record medium, its device and its method that store data in the MPEG system, can freely revise audio data reproduced with still picture data even after recording the still picture data. SOLUTION: An optical disk that is reproduced by a reproduction device records a 1st system stream (ST1) including still picture data of at least one picture and a 2nd system stream (ST2) that includes audio data reproduced with the still picture data. Each stream stores stamp information denoting a time required for decode processing and an output and the 2nd system stream (ST2) is recorded just after the 1st system stream (ST1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk storing still image data and audio data reproduced together with the still image data, a recording apparatus and method for such an optical disk, and a reproducing apparatus and method for such an optical disk.

[0002]

2. Description of the Related Art (Description of Digital Camera)
2. Description of the Related Art Digital still cameras using still image data of the EG (ISO / IEC 10918-1) system have become widespread. One of the reasons behind the spread of digital still cameras is the enhancement of AV processing functions of personal computers (PCs). Images taken by the digital still camera are taken into the PC as data that can be handled by the PC through a semiconductor memory, a floppy disk, infrared communication, or the like. The captured still image data can be used as one of editing materials in presentation software, word processing software, and Internet contents.

[0003] In recent years, digital still cameras have been introduced which are capable of capturing corresponding audio along with still images. The ability to simultaneously record sound corresponding to still images has made it possible to further differentiate it from conventional film still cameras.

FIG. 7 is a diagram showing a relationship between still image data (JPEG data) recorded by a digital still camera and audio data.

As shown in FIG. 7, still image data (JPE
G data) and audio data are recorded as one file. JPE in one shooting (and recording)
One G data file and one audio data file
Created file by file.

[0006] The relation between still image data (JPEG data) and audio data is roughly determined by the following two methods. First, as shown in FIG. 7A, there is a method of having link information to each of a JPEG data file and an audio data file. The second method is to match the body names (file names excluding the extension) of the JPEG data file and the audio data file as shown in FIG. 7B.

According to the above-described method, the association of the audio data corresponding to the still image data can be performed not only at the time of recording the still image data but also after the recording.

That is, if the user determines that the audio data recorded in association with the still image data is not appropriate, another audio data can be associated with the still image data recorded on the PC.

In recent years, in the multimedia age in which AV data such as moving images, still images, audio data, and the like are integrated, MPEG (Moving Picture Experts Group) is widely used as a core technology (information compression technology) of multimedia. It was started.

[0010]

When recording an image or sound using the above-described MPEG, the MPEG stream is multiplexed with a video stream and an audio stream as shown in FIG. Therefore, it is difficult to freely combine an audio stream after recording the video stream. That is, when changing audio data combined with still image data, it is necessary to handle the still image data and the audio data as one MPEG stream. For this purpose, it is necessary to decode the MPEG system stream and re-encode the extracted still image data and audio data again. As in the case of the digital still camera described in the related art, the still image data and the audio data must be decoded. There is a problem that it is difficult to freely combine and use data after recording.

The present invention has data in the MPEG system,
Another object of the present invention is to provide a recording medium capable of changing audio data reproduced together with still image data even after recording of the still image data, and a device and a method thereof.

[0012]

Means for Solving the Problems A first aspect of the present invention is as follows.
A decoder buffer (53, 57);
58) and an output unit (55, 56), the optical disc being reproducible by a reproducing apparatus, the optical disc including a plurality of units including still image data of at least one picture. One system stream (ST1) and a second system stream (ST2) including one or a plurality of units including audio data reproduced together with the still image data are recorded, and the unit performs decoding processing and output. Is stored, and the time stamp information includes the last unit of the first system stream in the decoder buffer (5).
3) Includes an input time SCR2 and a time SCR3 when the first unit of the second system stream is input to the decoder buffer (57), and between these times SCR2 and SCR3, , SCR2 + Tp ≦ SCR3 Here, Tp indicates the time required from the start of input of one unit to the decoder buffer until the end of input, and this holds true for an optical disc.

Thus, the second audio data is stored.
The system stream is the first stream in which the still image data is stored.
Since one system stream is stored independently without being multiplexed, rewriting of only the second system stream can be easily performed.

According to a second aspect of the present invention, the time stamp information further includes a time SC at which the first unit of the first system stream is input to the decoder buffer.
R1 is included, and for these times SCR1 and SCR2, the following expression is used: SCR1 = 0 SCR2 + Tp ≦ 27000000 (27 MHz) where (27 MHz) is a value 2
The optical disc according to the first aspect is characterized in that the following holds true: a count value of a clock of 7 MHz.

[0015] Thus, it is possible to set the time length for transferring the entire first system stream to the decoder buffer to 1 second or less.

According to a third aspect of the present invention, there is provided a method for controlling the time SCR3
Is the optical disc according to the second aspect, wherein the following expression is satisfied: SCR3 = 27000000 (27 MHz).

Thus, the transfer start time of the second system stream to the decoder buffer can be set one second after the transfer start time of the first system stream to the decoder buffer.

According to a fourth aspect of the present invention, the time stamp information further includes a time PTS1 at which the first system stream is output from the output unit (55, 56), and the second system stream includes the decoder (58) and the time PTS3 output from (58).
1. An optical disc according to any one of the first to third aspects, wherein PTS3 has the same value.

Thus, a still image based on the first system stream and a sound based on the second system stream are simultaneously output from the screen and the speaker.

According to a fifth aspect of the present invention, the time stamp information further includes a decoding start time DTS1 at which the first system stream is decoded by the decoder (53). DTS1 = 90000 (90 kHz) where (90 kHz) is 9
The optical disc according to any one of the first to fourth aspects, wherein the following holds true: a count value of a clock of 0 kHz.

Thus, the decoding start time of the second system stream can be set one second after the transfer of the first system stream to the decoder buffer is started.

According to a sixth aspect of the present invention, the time PTS
1, PTS3 is calculated by the following equation: PTS1 = PTS3 = 90000 (90 kHz
z) + Tv where (90 kHz) is 9
0 kHz clock count value, T
v is an optical disc according to a fourth aspect, wherein the following holds.

Thus, the still image screen display and audio output can be performed at one second after the transfer of the first system stream to the decoder buffer is started and at a time obtained by adding one frame period Tv.

According to a seventh aspect of the present invention, an optical disc includes:
Further, management information (Volum of the first and second system streams)
e) is recorded, and in the management information of the first system stream, an identification flag (Audio_Flag) indicating the presence of audio data reproduced in synchronization with the still image data
The optical disk according to any one of the first to sixth aspects, wherein:

With this identification flag, a still image
It is possible to determine whether or not a sound of simultaneous reproduction is attached.

According to an eighth aspect of the present invention, a still image is recorded on an optical disk which can be reproduced by a reproducing apparatus having a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56). An optical disk recording device for recording data and a system stream including audio data reproduced together with the still image data, wherein the recording device includes an encoder (1204) and a system control unit (12).
02), and the encoder (1204) includes a first system stream (ST1) including a plurality of units including still image data of at least one picture.
And a second system stream (ST2) including one or more units including audio data to be reproduced together with the still image data, and the system control unit (1202) performs a decoding process on the unit. And time stamp information indicating a time required for output, wherein the time stamp information includes a time SCR2 at which the last unit of the first system stream is input to the decoder buffer (53); And the time SCR3 when the first unit of the second system stream is input to the decoder buffer (57). Between these times SCR2 and SCR3, SCR2 + Tp ≦ SCR3 where Tp is the decoder buffer. From the start of input of one unit to the end of input Indicating the time required, an optical disk reproducing apparatus, characterized in that is established.

Thus, the second audio data is stored.
The system stream is the first stream in which the still image data is stored.
Since one system stream is stored independently without being multiplexed, rewriting of only the second system stream can be easily performed.

According to a ninth aspect of the present invention, the system control unit further includes, as the time stamp information, a time SCR1 at which the first unit of the first system stream is input (53) to the decoder buffer; The time PTS1 at which the first system stream is output from the output unit (55, 56) is stored.
For SCR2 and PTS1, the following equation SCR1 = 0 SCR2 ≦ 27000000 (27 MHz) −Tp PTS1 = 90000 (90 KHz) + Tv where (27 MHz) is 2
Indicates that it is a count value of a 7 MHz clock,
(90 KHz) means that the numerical value indicated before that is 90 KHz
Tp indicates the time required to transfer the last unit of the first system stream, and Tv indicates the frame period of the video data. An optical disc recording apparatus according to an eighth aspect.

Thus, the time when the transfer of the first system stream to the decoder buffer is set to 0, the time when the transfer of the first system stream to the decoder buffer ends is 1 second or less, and a still image is displayed. The time can be set to one second plus one frame period Tv.

According to a sixth aspect of the present invention, the system control unit further stores, as the time stamp information, a time PTS3 at which the second system stream is output from the decoder (58). PTS
An optical disc recording apparatus according to a ninth aspect, wherein the following equation is satisfied with respect to No.3: SCR3 = 27000000 (27 MHz) PTS3 = 90000 (90 KHz) + Tv

Thus, the time at which the transfer of the second system stream is started to the decoder buffer is set to 1 second, the time at which the audio is decoded and reproduced by the decoder is set to 1 second, and the time obtained by adding one frame period Tv. Can be set.

According to an eleventh aspect of the present invention, the system management unit further generates management information of first and second system streams, and synchronizes with the still image data in the management information of the first system stream. An optical disc recording apparatus according to any one of the eighth to tenth aspects, wherein an identification flag (Audio_Flag) indicating presence of audio data to be reproduced is stored.

With this identification flag, for a still image,
It is possible to determine whether or not a sound of simultaneous reproduction is attached.

According to a twelfth aspect of the present invention, the system management unit further includes a reproduction time (Cell_Playba) of the audio data in the management information of the second system stream.
ck_Time) is recorded on the optical disc recording apparatus according to any one of the eighth to eleventh aspects.

As a result, the audio reproduction time can be set.

According to a thirteenth aspect of the present invention, there is provided a reproducing apparatus for reproducing an optical disk according to the seventh aspect, comprising a decoder buffer (53, 57), a decoder (54, 58), and an output unit (55, 56) and a system control unit (51), and the system control unit (51) includes the identification flag (A).
An optical disc reproducing apparatus characterized in that, when a set state of (audio_Flag) is detected, the still image data of the first system stream and the audio data of the second system stream are synchronously reproduced.

The presence of the first system stream of the still image and the second system stream of the audio can be detected in advance based on the set state of the identification flag.

According to a fourteenth aspect of the present invention, the system control unit (51) includes an identification flag (Audio_Flag).
When the set state is detected, the decoder (54) completely decodes still image data of one picture recorded in the first system stream and sends it to the output unit (55, 56). The decoder (58) decodes the audio data stored in the second system stream and reproduces the audio, and simultaneously with the start of the reproduction of the audio, the still image data from the output unit (55, 56). An optical disc reproducing apparatus according to a thirteenth aspect, wherein reproduction of the optical disc is started.

Thus, the still image data in the first system stream and the audio data in the second system stream can be decoded in individual time zones.

According to a fifteenth aspect of the present invention, a still image is recorded on an optical disc which can be reproduced by a reproducing apparatus having a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56). A recording method for recording a data and a system stream including audio data to be reproduced together with the still image data, wherein the first system stream includes a plurality of units including at least one picture of still image data. ST1), recording a second system stream (ST2) including one or a plurality of units including audio data reproduced together with the still image data, and decoding and outputting to the unit. Recording time stamp information indicating the time required for the As time stamp information, the first
The time SCR2 when the last unit of the system stream is input to the decoder buffer (53), and the time SCR3 when the first unit of the second system stream is input to the decoder buffer (57).
Is generated, and between these times SCR2 and SCR3,
SCR2 + Tp ≦ SCR3 Here, Tp indicates the time required from the start of input of one unit to the decoder buffer until the end of input, and this is a recording method characterized by the following.

Thus, the second audio data is stored.
The system stream is the first stream in which the still image data is stored.
Since one system stream is stored independently without being multiplexed, rewriting of only the second system stream can be easily performed.

According to a sixteenth aspect of the present invention, as the time stamp information, the time SCR1 at which the first unit of the first system stream is input (53) to the decoder buffer, and the first system stream is The time PTS1 output from the output unit (55, 56) is generated, and for these times SCR1, SCR2, and PTS1, the following expression is used: SCR1 = 0 SCR2 ≦ 27000000 (27 MHz) −Tp PTS1 = 90000 (90 KHz) + Tv where ( 27MHz), the value indicated before it is 2
Indicates that it is a count value of a 7 MHz clock,
(90 KHz) means that the numerical value indicated before that is 90 KHz
Tp indicates the time required to transfer the last unit of the first system stream, and Tv indicates the frame period of the video data. A recording method according to a fifteenth aspect.

Thus, the time at which the transfer of the first system stream is started to the decoder buffer is set to 0, the time at which the transfer of the first system stream is completed to the decoder buffer is set to 1 second or less, and a still image is displayed. The time can be set to one second plus one frame period Tv.

According to a seventeenth aspect of the present invention, a time PTS3 at which the second system stream is output from the decoder (58) is generated as the time stamp information, and the time SCR3 and PTS3 are expressed by the following equation SCR3. = 2700000 (27 MHz) PTS3 = 90000 (90 KHz) + Tv is the recording method according to a sixteenth aspect.

Thus, the time at which the transfer of the second system stream is started to the decoder buffer is set to 1 second, and the time at which the audio is decoded and reproduced by the decoder is set to 1 second and the time obtained by adding one frame period Tv. Can be set.

The eighteenth aspect of the present invention further provides the first and second aspects.
Recording management information of a system stream, and generating an identification flag (Audio_Flag) in the management information of the first system stream, which indicates presence of audio data reproduced in synchronization with the still image data. A recording method according to any one of the fifteenth to seventeenth aspects.

With this identification flag, for a still image,
It is possible to determine whether or not a sound of simultaneous reproduction is attached.

A nineteenth aspect of the present invention is the optical disc recording apparatus according to the eighteenth aspect, further comprising generating a reproduction time (Cell_Playback_Time) of the audio data in the management information of the second system stream. .

As a result, the audio playback time can be set.

According to a twentieth aspect of the present invention, there is provided a reproduction method for reproducing a system stream recorded on an optical disk according to the seventh aspect, wherein the management information of the still image data of one picture includes An identification flag (Audio_F) indicating presence of audio data reproduced in synchronization with image data
lag), and a step of synchronously reproducing the still image data and the audio data in response to the detection of the set state of the identification flag. .

The presence of the first system stream of the still image and the second system stream of the audio can be detected in advance based on the set state of the identification flag.

According to a twenty-first aspect of the present invention, the step of synchronously reproducing includes the step of setting the identification flag (Audio_Fla).
g) completely decoding still image data of the one picture in response to the detection of the set state of g);
A twentieth aspect of the optical disc reproducing method according to the twentieth aspect, wherein a step of decoding and reproducing the audio data and a step of starting reproduction of the decoded still image data simultaneously with the start of reproduction of the audio data.

Thus, the still image data in the first system stream and the audio data in the second system stream can be decoded in individual time zones.

[0054]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as one embodiment of the present invention, a DVD-RA
A DVD recorder using M will be described in detail.

(Description of Normal MPEG Stream) First, a normal MPEG stream (AV data) will be described. Since the structure of a normal MPEG stream will be apparent to those skilled in the art, a description will be given focusing on parts that are relevant to the present invention.

As described above, as an AV data compression method, there is an international standard called MPEG (ISO / IEC13818).

MPEG has the following two main features in order to realize highly efficient data compression.

First, in the compression of moving image data,
In addition to the conventional compression method using spatial frequency characteristics for removing redundant components in one frame, a compression method using time correlation characteristics for removing redundant components between frames has been introduced. In MPEG, each frame (also referred to as a picture in MPEG) is defined as an I picture (intra-frame coded picture), a P picture (picture using intra-frame coding and a reference relationship from the past), and a B picture (intra-frame coded picture). Data using a reference relationship from the past and the future).

FIG. 3 is a diagram showing the relationship among I, P, and B pictures. As shown in FIG. 3, the P picture refers to the closest I or P picture in the past, and the B picture refers to the closest I or P picture in the past and the future, respectively. Also, as shown in FIG. 3, since the B picture refers to a future I or P picture, the display order of each picture does not match the coding order of the compressed data. Occurs.

The second feature of MPEG is that dynamic code amount allocation according to the complexity of an image can be performed on a picture basis. The MPEG decoder has an input buffer,
By storing data in this decoder buffer in advance, a large amount of code can be allocated to a complicated image that is difficult to compress.

In MPEG, MPEG audio, which is an encoding type defined by the MPEG system, is supported as audio data to be reproduced together with a moving image. In MPEG, in addition to the above-described MPEG audio, it is allowed to use various encoding types for each application.

The audio data encoding type used in the present invention includes a data compression type and a data non-compression type. Types that perform data compression include MPEG audio and Dolby Digital (AC-
3), and LPCM is an uncompressed type.
Dolby Digital and LPCM have a fixed bit rate, while MPEG audio is not as large as a video stream, but can be selected from several sizes in audio frame units.

The moving picture data and audio data described above are multiplexed (multiplexed) into one stream by a method called an MPEG system. The multiplexed moving image data and audio data are called a system stream in MPEG. Data in a state where moving image data and audio data are multiplexed is generally called AV data.

FIG. 4 is a diagram showing the structure of an MPEG system stream. 41 is a pack header, 42 is a packet header, and 43 is a payload. MPEG system streams have a hierarchical structure called packs and packets.

The packet is the minimum unit in the multiplexing process, and the pack is the minimum unit in the transfer process.

The packet is composed of a packet header 42 and a payload 43. The AV data is divided into appropriate sizes from the beginning and stored in the payload 43.
The packet header 42 has an ID (stream I) for identifying the type of data stored in the payload 43.
D) and a time stamp at the time of reproducing data included in the payload, which is described with an accuracy of 90 kHz. The type of data indicated by the ID includes a moving image, audio, and the like. The time stamp includes the decode time DTS (De
coding Time Stamp and display time PTS (Presentation Time Stamp)
mp) is recorded. When decoding and display are performed simultaneously like audio data, storage of DTS is omitted.

A pack is a unit in which a plurality of packets are collected. In this embodiment, one packet is one packet.
Consists of packs. The pack includes a pack header 41 and a packet (packet header 42 and payload 43).
Consists of

In the pack header, the time at which the data in the pack is input to the decoder buffer is represented by an SCR (System Clock Rewrite) with an accuracy of 27 MHz.
reference) is recorded.

Next, a decoder for decoding the above-mentioned MPEG system stream will be described.

FIG. 5 shows a decoder model (P-STD) of the MPEG system decoder.
The details are shown below. ST 51 is a reference time in the decoder.
A system control unit having C (System Time Clock) 52 decodes a system stream,
That is, 53 is a demultiplexer for demultiplexing, 53 is a video buffer of a video decoder, 54 is a video decoder, and 55 is I, I, in order to absorb the difference between the data order and the display order occurring between the P picture and the B picture. A reorder buffer for temporarily storing P pictures, 56 is a switch for adjusting the output order of I, P and B pictures in the reorder buffer, 57 is an input buffer of an audio decoder, and 58 is an audio decoder.

Next, the processing operation of the above-described MPEG system stream by the MPEG system decoder will be described. When the time of the STC 51 matches the SCR described in the pack header, the pack needs to be input to the demultiplexer 52. The STC 51 is initialized by the SCR of the first pack. The demultiplexer 52 decodes the stream ID in the packet header and transfers the data of the payload to the decoder buffer for each stream. Also, P in the packet header
Take out TS and DTS. The video decoder 54
At the time when the DTS coincides with the time of the STC 51, the picture data is taken out from the video buffer 53 and subjected to decoding processing. The B picture is displayed and output as it is, and the I and P pictures are stored in the temporary reorder buffer 55 without being output as it is.

The switch 56 corrects the difference between the decoding order and the output display order described above with reference to FIG. That is, if the picture output by the video decoder 54 is B
In the case of a picture, switching is performed so that the output from the video decoder 54 is output to the outside, and in the case of I and P pictures, switching is performed so that the output from the reorder buffer 55 is output to the outside.

Since the reordering is performed to correct the difference between the decoding order and the output order, the I picture cannot be output simultaneously with the decoding. Even if it is assumed that there is no B picture, the output from the decoding to the output is delayed by one picture, that is, by one video frame period.

Similarly to the video decoder 54, the audio decoder 58 extracts and decodes one audio frame of data from the audio buffer 57 at the time when the time of the STC 51 and the PTS (there is no DTS for audio) match.

Next, a method of multiplexing the MPEG system stream will be described with reference to FIG. FIG. 6A shows a video frame, FIG. 6B shows a video buffer, and FIG.
FIG. 6C shows an MPEG system stream, and FIG. 6D shows audio data. The horizontal axis shows a time axis common to each figure, and each figure is drawn on the same time axis. In the state of the video buffer, the vertical axis indicates the buffer occupancy (the amount of data stored in the video buffer), and the thick line in the figure indicates the temporal transition of the buffer occupancy. The slope of the bold line corresponds to the video bit rate, indicating that data is being input to the buffer at a constant rate. The fact that the buffer occupancy is reduced at regular intervals indicates that data has been decoded. The intersection of the diagonal dotted line and the time axis indicates the start time of data transfer of the video frame to the video buffer.

(Problem of Normal MPEG Stream) It is considered that the above-described still image camera using the normal MPEG stream does not actually exist as a product due to a problem described later. However, for convenience in explaining the issues,
This will be described below assuming this.

FIGS. 17 and 18 show the relationship between the reproduction operation of the MPEG stream by the assumed still image camera by the decoder and each time stamp (STC, PTS, DTS).
This will be described with reference to FIG. Note that each configuration of the decoder refers to the configuration shown in FIG.

FIG. 17 is a diagram for explaining an operation in which data captured by a still picture camera is reproduced on a PC. FIG.
(A) shows a screen displayed on the display of the PC.
In the figure, Photo # 1 and Photo # 2 are individually displayed as icons as files. In a GUI (graphical user interface) such as Windows 95, by clicking each of the displayed files with a mouse or the like as a pointing device, the contents of the file are displayed on a display device attached to the PC, and the sound is attached to the PC. Can be output from the speaker. FIG. 17B shows a state where the contents of Photo # 1 and Photo # 2 are output.

As shown in FIG. 17B, when the file of Photo # 1 is clicked, a still pictur is displayed as a still image.
e # 1 is displayed on the screen, and at the same time, Audio # 1 is output from the speaker of the PC. When the file of Photo # 2 is clicked, Still picture # 2 is displayed on the screen as a still image, and at the same time, Audio # 2 is output from the speaker of the PC.

FIG. 18 is a view for explaining the relationship between the assumed operation of the decoder of the still image camera and each time stamp when Photo # 1 is reproduced.

FIGS. 18A and 18B show a state where Still picture # 1 as a still image of Photo # 1 and Audio # 1 as audio are output. FIGS. 18C and 18D show stills.
The transition of the buffer occupancy of the audio decoder buffer 57 and the video decoder buffer 53 when the picture # 1 and the audio # 1 are respectively decoded and output are shown.
FIG. 18E shows the pack arrangement when Photo # 1 is stored as an MPEG stream as stream # 1 on the disc and the respective time stamps (SCR, PTS, DTS) stored in the pack.

For convenience of explanation, the packets in the pack are not shown, but DTS and PTS are present in the packet header in the packet as described above. Also,
Similarly, there are four video packs and two audio packs, but since the data amount of the pack is only 2 KB,
Actually, there are more than 100 video packs and 100 audio packs. Needless to say, these are obvious to those skilled in the art.

As a first explanation of the assumed reproduction operation of the still image camera, stream # 1 shown in FIG.
The operation of transferring each of the packs forming the above to the demultiplexer 52 will be described.

As shown in FIG. 18 (e), stream # 1
Has a configuration in which each pack is multiplexed in the order of video pack V1, video pack V2, audio pack A1, video pack V3, video pack V4, and audio pack A2 from the top.

As described above, in each pack, the SCR value indicating the timing of input to the demultiplexer 52 is stored in the pack header. In the case of the example shown in FIG.
The time t1 is applied to the SCR # 1 of the video pack V1, the time t2 is applied to the SCR # 2 of the video pack V2, the time t3 is applied to the SCR # 4 of the audio pack A1, and the video pack V
The time t4 is set in the SCR # 3 of the video pack V3.
In CR # 5, time t5 is the SC of audio pack A2.
The time t8 is set as an SCR value in R # 6.

A PTS and a DTS are set in the head pack of a picture. Time t7 is set in PTS # 1 of the video pack V1, and time t6 is set in DTS # 1.
Note that video packs other than the first pack of pictures are PT
Not set because S and DTS are the same.

A PTS is set for each audio pack. The time t is added to the PTS # 1 of the audio pack A1.
7 is at time t9 in PTS # 2 of audio pack A2.
Is set. In the case of audio data, PTS
And DTS are equal, so only the PTS is set, and the DTS
Is omitted.

Each pack constituting stream # 1 resets the STC at time t1, which is the value of SCR # 1 of video pack V1, which is the first pack, and then resets the SC of each pack.
The signal is input to the demultiplexer 52 at the timing indicated by the R value.

That is, as shown in FIG. 18 (e), first, the video pack V1 is demultiplexed by the demultiplexer 5 at time t1.
2 and then the video pack V2 at time t2,
Next, the audio pack A1 is at time t3, the video pack V3 is at time t4, the video pack V4 is at time t5, and then the audio pack A2 is at time t8.
Are input to the demultiplexer 52. The demultiplexer 52 to which each pack is input outputs to the video buffer 53 if the input pack is a video pack,
If the input pack is an audio pack, it outputs to the audio buffer 57.

Next, as a second description of the assumed reproduction operation of the still picture camera, the decoding and output operation of the data of each video pack output to the video buffer 53 will be described.

As shown in FIG. 18C, each video pack output from the demultiplexer 52 has a negligible delay, but at the timings of time t1, time t2, time t4, and time t5, which are SCR timings. It is stored in the video buffer 53. Since still picture Still picture # 1 is composed of video packs V1 to V4, if video pack V4 is stored in video buffer 53, still picture Still
This means that all the data making up picture # 1 has been stored in the video buffer 53. As shown in FIG. 18E, a still picture Still picture # 1 including video packs V1, V2, V3, and V4 has a time t6 as a DTS value. Therefore, the stored data is decoded by the video decoder 54 at the timing of the time t6, and the buffer occupancy of the video buffer is reduced.

The decoded data of each video pack constitutes an I picture, which is a still picture data Stil.
l picture # 1. The decoded I picture is stored in the reorder buffer 55, and is output to the outside at the timing of the time t7, which is the PTS value.

Note that the end of the display of Still picture # 1 is not defined as a time stamp on the MPEG stream. Generally, the next MPEG stream is deleted when the reproduction is started, and the video output is generally terminated by controlling an external decoder such as an application. Therefore, the example shown in FIG. 18 indicates that Still picture # 1 is displayed even after time t10 when the audio output ends.

Next, as a third description of the assumed reproducing operation of the still image camera, the relationship between the operation of decoding and outputting the audio pack data output to the audio buffer 57 and each time stamp will be described.

As shown in FIG. 18D, each audio pack output from the demultiplexer 52 is at time t3,
At the time t8, the audio buffer 57 stores the audio buffer 57 and increases the occupancy of the audio buffer 57. Audio data differs from video data in that
Since S and DTS are equal, the audio decoder 57 decodes the data of each pack and outputs audio at the same time. That is, the data of the audio pack A1 stored in the audio buffer 57 is decoded by the audio decoder 57 at the time t7, which is the PTS value, and the audio output is started. The data of the audio pack A2 stored in the audio buffer 57 at the timing of time t8 is decoded by the audio decoder 57 and output as audio at the timing of time t9, which is the PTS value.

In MPEG, the time during which data can be stored in each buffer of the decoder is limited. This predetermined time is specified as one second in the case of moving image data.

Therefore, the difference between the transfer times of the simultaneously output video data and audio data, that is, the difference between the SCRs is 1 second at the maximum. However, strictly speaking, there may be a further shift by the reorder of the video data.

(Problems of MPEG Stream) The inventor of the present invention has extracted and arranged the problems in using the above-described ordinary MPEG stream with a still image camera through many years of research and development.

An MPEG system stream generated by multiplexing video data and audio data reproduced together with the video data is edited to change the audio data reproduced together with other audio data after the generation. Is difficult. That is, after a still image and a sound are captured by a still image camera and the data is stored in a recording medium as an MPEG stream, it is difficult to perform editing for changing the sound at the time of shooting to another sound.

For example, in the example shown in FIG.
1 is the still image data Still when shooting with the still image camera
It is recorded on the disc as an MPEG stream composed of picture # 1 and audio data Audio # 1. As shown in FIG. 18E, the generated MPEG stream has a configuration in which a video pack and an audio pack are multiplexed. For this reason, after the user once shoots, the audio data of Photo # 1 is transferred to Audio # 1.
It is difficult to change from to other audio data.

The following three methods are conceivable as a method of rearranging and editing audio after photographing.

1) A method is conceivable in which an MPEG stream is generated by combining all of the audio data that may be combined in advance with video data as photographed still image data, and these are all stored in a recording medium. For example, in the case of the example shown in FIG. 18, a stream in which only the audio pack is changed may be separately stored in addition to the stream # 1 shown in FIG. However, in this case, since there is an upper limit on the recording capacity of the recording medium, there is also a limit on the recordable MPEG stream. Also, in any case, it is virtually impossible for the user to determine all sounds that may be combined with a still image at the time of shooting.

2) At the time of editing, the MPEG system stream is decoded to extract still image data and audio data, respectively, and the extracted still image data and audio data to be changed are system-encoded again. However, in this case, decoding and encoding must be performed each time editing is performed, and editing takes time. In addition, a large memory is required for a still image camera to store one system stream in a decoded state.

3) A video stream and an audio stream are divided into two streams and stored in a recording medium in advance. Then, a method of determining the combination at the time of reproduction can be considered. According to this method, after the still image is recorded on the recording medium, the added audio data can be used as audio data to be reproduced together with the still image.

The inventor has adopted the above 3). That is, a method and apparatus for reproducing two MPEG streams separately stored on a disc by a conventional decoder as if they were one stream were realized.

(MPEG stream of the present invention) In order to realize the present invention, two MPEG streams of still image data and audio data which exist separately as described above are conventionally reproduced by a single decoder. It is necessary for the decoder to process two MPEG streams as one system stream.

The biggest problem in processing two MPEG streams as if they were one MPEG stream is that each of the two streams is given a time stamp independently, and the two streams are continuously processed as one stream. When processing is performed in a contiguous manner, inconsistency such as discontinuity occurs between the time stamps assigned to the respective streams.

[0108] The time stamp in the MPEG stream is added by the multiplexing process. In the case of a normal MPEG stream, the initial value of the time stamp (the first SCR added) is not specified by the standard, and is specified by the encoder. The fact is that it takes a unique value. Therefore, there is no continuity or correlation between the time stamps between the MPEG streams created by the different encoders. For example, an MPEG stream encoded by an encoder A with an initial SCR of 0 is stream A, and an MPEG stream encoded by an encoder B with an SCR initial value of 1000 is stream B. Also, the SCR value of the last pack of stream A is 27000000 (27 MHz).
Here, (27 MHz) indicates that the numerical value indicated before that is 27 MHz.
Indicates that it is a count value of a clock of MHz. It is assumed that stream A and stream B are continuously processed by a decoder as if they were one stream. in this case,
S from the end of stream A to the beginning of stream B
The discontinuity of the CR occurs, and the possibility that the decoder malfunctions such as hang-up becomes extremely high.

For this reason, in the recording apparatus of the present invention, the value of the time stamp (SCR, PTS, DTS) of the system stream generated and recorded on the disc is limited to a predetermined value.

Next, the limit value for the time code of the MPEG stream according to the present invention will be described below.

FIG. 11 is a diagram for explaining the time stamps of the still image data system stream ST1 and the audio data system stream ST2.

In FIG. 11, (a) shows a video object (VOB) which is a system stream ST1 for still image data. In the first pack, SCR1 is stored in the pack header, and PT
S1 and DTS1 are stored. Also, it is shown that SCR2 is stored in the pack header of the last pack.

(B) shows a video object (VOB) which is the audio data system stream ST2. The first pack indicates that SCR3 is stored in the pack header and PTS3 is stored in the packet header.

(C) illustrates a state in which the still image data system stream ST1 and the audio data system ST2 are successively input to the decoder during reproduction.

In the present invention, the still image data system stream ST1 and the audio data system stream ST2 are processed as if they were a single system stream and a decoder. And the SCR3 of the first pack of the system stream ST2 constituting the audio data are restricted by providing prescribed values by the following formula.

SCR2 + Tp ≦ SCR3 (Formula 1)

Here, Tp is the time required to transfer one pack to the decoder. That is, Tp is the time required from the start of input of one pack to the demultiplexer 52 to the end of input. In the demultiplexer 52, the packs are simply distributed, so Tp is the time required from the start of input of one pack to the buffer 53 or 57 to the end of input.

(Equation 1) limits the minimum value of SCR3. SCR3 is often a value of 0 in the case of a normal MPEG system, but the present invention uses a value obtained by the restriction of (Equation 1).

As a result, it is possible to avoid that SCR2 becomes larger than SCR3, and the SCR of each pack constituting the system stream for still picture data and the system stream for audio data is arranged in ascending order over the two system streams. To be distributed to

(Equation 1) also guarantees that the difference between SCR2 and SCR3 is greater than or equal to Tp. This prevents the transfer timing of the first pack of the audio data system stream from occurring during the transfer of the last pack of the still image data system stream.

The transfer time (Tp) of the pack is as follows when the transfer rate of the system stream is 8 Mbps.
55296 (27 MHz). In addition, 10.08M
When it is set to bps, it becomes 43885 (27 MHz).

Next, the decoder of the present invention is configured such that, when an MPEG stream constituting still picture data is input to the decoder, after the input is completed, the next audio stream is input without resetting the STC. Is done.

This is because the decoder normally resets the STC for each system stream, and if the STC is reset after the input of the still image data, the above-mentioned limitation of the SCR of the first pack of the stream means. This is because it will not be done.

Since the decoder performs processing based on the time stamp set as described above, the still image data and the audio data can be handled as one MPEG stream. In other words, it is possible to reproduce a separately recorded still image stream and audio stream as if they were one system stream.

Further, PTS1 and PTS3 are set equal to a predetermined value as described below.

PTS1 = PTS3 = predetermined value (Equation 2)

Thus, the output of the audio and the still image can be started at the same timing.

The predetermined value is, for example, 90000 (90 kHz).
z) + Tv. Here, (90 kHz) indicates that the numerical value indicated before that is the count value of the clock of 90 kHz. Tv is the frame period of the video and is NT
3003 for SC signal, 360 for PAL signal
It becomes 0.

Next, the above (Equation 1) and (Equation 2) and about one second after reading (90000 (90 kHz))
Various time stamps in FIG. 11 will be specifically described using a case where a still image and a sound are simultaneously output at (+ Tv).

First, the time stamp of the VOB for still picture data will be described.

(1) The SCR (SCR1) of the first pack of the VOB for still image data is 0 (27 MHz).

(2) The DTS (DTS1) of the first pack of the VOB for still image data is 90000 (90 kHz). Note that the VOB for still image data includes only one still image.

(3) The PTS (PTS1) of the first pack of the VOB for still image data is 93003 (90 kHz). However, 93003 is the case where the video is NTSC, and 93600 when the video is PAL. This is because the frame period (Tv) of the video is 3003 when the video is PAL, and 3600 when the video is PAL. Further, since the VOB for still image data includes only one still image, all packs are output simultaneously at the timing indicated by PTS1.

(4) The SCR (SCR2) of the final pack of the still image data VOB is 27000000 (27 MHz).
It has a value equal to or less than the time obtained by subtracting the transfer time (Tp) of one pack from z). 27000000 (27MHz)
Is referred to as a reference value.

This reference value is determined in consideration of the fact that the longest time from when the moving image data is input to the decoder buffer until it is decoded is 1 second (27000000 (27 MHz)).

That is, when the longest accumulation time of the moving image data is adopted also for the still image data, the still image data VO
All packs that make up B take 1 second (270,000,000
(27 MHz)). If the SCR (SCR1) of the first pack is 0, this pack is transferred to the decoder for 1 second (27000).
000 (27 MHz)), the SCR (SCR) of the last pack constituting the same still image data
2) is 270,000,000 (27 MH) as described above.
The transfer time (Tp) of one pack is subtracted from z).

The above-described predetermined value of the PTS and the meaning of determining this reference value are compatible with the encoder. That is,
The present invention is applied to any still image system stream or audio system stream encoded according to (Equation 1), (Equation 2), a predetermined value, and a reference value. be able to.

In this embodiment, the reference value has been described as one second (27000000 (27 MHz)).
Assuming that the reference value is MaxT, the following equation is established.

SCR2 + Tp ≦ MaxT (Equation 3) SCR3 = MaxT (Equation 4)

Next, the time stamp of the audio data VOB will be described.

(1) SCR (S
CR3) is 27000000 (27 MHz). This is a value that satisfies (Equation 1) and is input to the decoder in the shortest time, following the previously input still image data VOB. Further, the PTS (PTS1) of the still image is set to 930
Since the frequency is set to 03 (90 kHz), in order to output voice simultaneously, it is necessary to set the SCR value to at least a smaller value.

(2) PTS of the first audio frame
(PTS3) is 93003 (90 kHz). However, 93003 is the case where the video is NTSC, and 93600 when the video is PAL.

It is needless to say that the still image data VOB and the audio data VOB need only be encoded so as to satisfy (Equation 1) and (Equation 2), and it is not always necessary to satisfy the above-described condition values.

The video is NTSC, and the initial value of the SCR is not 0 but 27000000 (27 MHz) which is 1 second.
In the case of z), the following is obtained. SCR1 = 27000000 (= 1 second) SCR2 ≦ 5394704 (= SCR3-Tp) SCR3 = 54000000 (= SCR1 + 1 second) PTS1 = PTS3 = 183003 (= DTS1 + 30)
03) DTS1 = 180000 (= 1 second)

When the initial value of the SCR is 0 and the PTS is 1 second in the case of NTSC, the following is obtained. SCR1 = 0 SCR2 ≦ 26043804 (= SCR3-Tp) SCR3 = 26099100 (= 1 second−3003 × 30)
0) PTS1 = PTS3 = 90000 (= 1 second) DTS1 = 86997 (= PTS1-3003)

In the case of PAL, if the initial value of SCR is 27000000 (27 MHz), which is one second, the following is obtained. SCR1 = 27000000 (= 1 second) SCR2 ≦ 5394704 (= SCR3-Tp) SCR3 = 54000000 (= SCR1 + 1 second) PTS1 = PTS3 = 183600 (= DTS1 + 36)
00) DTS1 = 180000 (= 1 second)

In the case of PAL, when the initial value of the SCR is 0 and the PTS is 1 second, the following is obtained. SCR1 = 0 SCR2 ≦ 25864704 (= SCR3-Tp) SCR3 = 259920000 (= 1 second−3600 × 30
0) PTS1 = PTS3 = 90000 (= 1 second) DTS1 = 86400 (= PTS1-3600)

When the transmission speed is 10.08 Mbps,
The case of NTSC is as follows. SCR1 = 0 SCR2 ≦ 26956115 (= SCR3-Tp (= 4
3885)) SCR3 = 27000000 (= 1 second) PTS1 = PTS3 = 93003 (= DTS1 + 300
3) DTS1 = 90000 (= 1 second)

Further, when the transmission speed is 10.08 Mbps,
In the case of PAL, it becomes as follows. SCR1 = 0 SCR2 ≦ 26956115 (= SCR3-Tp (= 4
3885)) SCR3 = 27000000 (= 1 second) PTS1 = PTS3 = 93600 (= DTS1 + 360
0) DTS1 = 90000 (= 1 second)

Next, an operation in which an MPEG stream having a time stamp set under the above-described restrictions is processed by a decoder will be described with reference to FIGS. Note that FIG. 5 is referred to for each configuration of the decoder.

FIG. 19 is similar to FIG.
FIG. 8 is a diagram illustrating the relationship between the operation of the decoder of the still image camera of the present invention and each time stamp when o # 1 is reproduced.

FIGS. 19A and 19B show a state where Still picture # 1 which is a still image of Photo # 1 and Audio # 1 which is audio are output. FIGS. 19C and 19D show stills.
The transition of the buffer occupancy of the audio decoder buffer 57 and the video decoder buffer 53 when the picture # 1 and the audio # 1 are respectively decoded and output are shown.
FIG. 19E shows the pack arrangement when Photo # 1 is stored as an MPEG stream as stream # 1 and stream # 2 on a disc, and the respective time stamps (SCR, PTS, DTS) stored in the pack. .

As in FIG. 18, illustration of the packet structure and the like are omitted.

As a first explanation of the reproducing operation of the still picture camera of the present invention, first, stream # 1 shown in FIG.
The operation of transferring each pack constituting the stream # 2 to the demultiplexer 52 will be described.

As shown in FIG. 19 (e), stream # 1
Has a configuration in which each pack is multiplexed in the order of video pack V1, video pack V2, video pack V3, and video pack V4 from the top. Also, stream # 2 has a configuration in which audio packs A1 and A2 are multiplexed from the beginning. It should be noted that stream # 1 is composed of only video packs, and stream # 2 is composed of only audio packs.

Each pack stores an SCR. As shown in FIG. 19E, the time t1 is set in the SCR # 1 of the video pack V1 of the stream # 1 and the video pack V2
Time S2 in the SCR # 2 of the video pack V3
In R # 3, the time t3 is the SCR # 4 of the video pack V4.
, The time t4 is set as the SCR value. Further, a PTS value and a DTS value are set in the first video pack.
The time t8 is set in the PTS # 1 of the video pack V1 by the DTS.
Time t6 is set in # 1.

In the present embodiment, the time t1, which is the SCR value of the first pack, is 0, as in the above description. Also, video pack V4 which is the final video pack
At time t4, which is the SCR value of 27000000 (27
MHz) -Tp. Tp is the pack transfer time as described above, and is 55296 (27 MHz). The video data is in the NTSC format, and the time t8, which is the PTS value, is 93003 (90 KHz), and the time t6, which is the DTS value, is 90000 (90 KHz).

At time t7, SCR # 5 of the audio pack A2 in the audio pack A2 of the stream # 2
Time t9 is set as an SCR value in CR # 6. The audio pack A1 and the audio pack A2 have P
The TS value is set. PTS # of audio pack A1
5, the time t8 corresponds to the PTS # 6 of the audio pack A2.
Is set to time t10.

In this embodiment, the time t7, which is the SCR value of the first audio pack A1, is 27000000.
(27 MHz). In addition, P of audio pack A1
The time t8, which is the TS value, is 93003 (90 KHz) because it is the same as the PTS value of the video data.

Each pack constituting stream # 1 resets the STC at time t1, which is the value of SCR # 1 of video pack V1, which is the first pack, and then resets the SC of each pack.
The signal is input to the demultiplexer 52 at the timing indicated by the R value.

That is, as shown in FIG. 19 (e), first, the video pack V1 is supplied to the demultiplexer 5 at time t1.
2 and then the video pack V2 at time t2,
Next, the video pack V3 at time t3 and then the video pack V4 at time t4, respectively.
Is input to

Here, the point different from the decoding processing of the still picture camera described with reference to FIG.
The point is that each pack forming the stream # 2 is input to the demultiplexer 52 at the timing indicated by each SCR without resetting the STC of the decoder.

As shown in FIG. 19, first, the audio pack A1 is input to the demultiplexer 52 at time t7, and then the video pack A2 is input at time t9.
The signal is input to the demultiplexer 52.

It should be noted here that the SCR # 4 of the last video pack V4 and the SC of the first audio pack A1
That is, the above-described relationship of (Equation 1) is established between R # 5. That is, the following relationship is established.

SCR # 4 + Tp ≦ SCR # 5 (Equation 1)

Therefore, stream # 1 and stream # 1
2, the continuity of the SCR value is guaranteed, and the interval is guaranteed to be at least equal to or longer than the pack transfer time.
One stream can be processed continuously.

Demultiplexer 5 to which each pack is input
2 outputs to the video buffer 53 if the input pack is a video pack, and outputs to the audio buffer 57 if the input pack is an audio pack.

Next, as a second explanation of the reproduction operation of the still picture camera of the present invention, the operation of decoding and outputting the data of each video pack output to the video buffer 53 will be described.

As shown in FIG. 19 (c), each video pack output from the demultiplexer 52 has a negligible delay, but at the timings of time t1, time t2, time t3, and time t4, which are SCR timings. It is stored in the video buffer 53. Since still picture Still picture # 1 is composed of video packs V1 to V4, if video pack V4 is stored in video buffer 53, still picture Still
This means that all the data making up picture # 1 has been stored in the video buffer 53. As shown in FIG. 19E, the DTS values of the pictures constituting the video packs V1, V2, V3, V4 are at time t6. Therefore, the stored data is transferred to the video decoder 54 at the timing of time t6.
To reduce the buffer occupancy of the video buffer.

[0170] The decoded data of each video pack constitutes an I picture, which is composed of still image data Stil.
l picture # 1. The decoded I picture is stored in the reorder buffer 55, and the PTS value t8
Is output to the outside at the timing of.

Next, as a third description of the reproducing operation of the still picture camera of the present invention, the relationship between the operation of decoding and outputting the audio pack data output to the audio buffer 57 and each time stamp will be described.

As shown in FIG. 19D, each audio pack output from the demultiplexer 52 is output at time t7,
At the time t9, the occupancy of the audio buffer 57 stored in the audio buffer 53 increases. Audio data differs from video data in that
Since S and DTS are equal, the audio decoder 57 decodes the data of each pack and outputs audio at the same time. That is, the data of the audio pack A1 stored in the audio buffer 57 is decoded by the audio decoder 57 at the time t8, which is the PTS value, and the audio output is started. The data of the audio pack A2 stored in the audio buffer 57 at the timing of the time t9 is the PTS value at the time t10.
The audio is decoded by the audio decoder 57 and output as audio at the timing shown in FIG.

The point to be noted here is that the stream # 1 constituting still image data and the stream # 2 constituting audio data have the same PTS value. For this reason, stream # 1 and stream # 2 are separately input to the decoder, but are output simultaneously since the PTS values are the same.

As described above, if the time stamp is below the limit value, the MPEG stream consisting of only the still image data and the MPEG stream consisting of only the audio data are continuously processed by the decoder, and at the same time, the audio and the video are simultaneously processed. It can be seen that the display can be performed.

Since the still image and the audio MPEG stream are separately recorded on the disk, it is easy to change the audio data output simultaneously after the still image is captured.

For example, the Still Picture # described with reference to FIG.
It is assumed that 1 and Audio # 1 are data recorded on the optical disk at the time of shooting. If it is desired to change the audio output simultaneously with Still Picture # 1, an MPEG stream having a time stamp satisfying (Equation 1) and (Equation 2) may be separately recorded in the same manner as the MPEG stream of Audio # 1. Audio # 2
20 is separately recorded as MPEG stream # 3.

Although not shown, management information indicating an MPEG stream for audio data reproduced simultaneously with the MPEG stream of Still Picture # 1 is recorded on the disc. By updating the management information, the MPEG stream of Audio # 2 is reproduced simultaneously with the MPEG stream of Still Picture # 1 instead of Audio # 1.

(Explanation of DVD-RAM) Next, the M
A DVD-RAM will be described as a recording medium suitable for recording a PEG stream and its recording format.

In recent years, the density of rewritable optical discs has been increased, and it is becoming possible to record not only computer data and audio data but also image data.
For example, a guide groove on an uneven surface is conventionally formed on a signal recording surface of an optical disk.

Conventionally, signals were recorded only on the convex or concave portions. However, signals can be recorded on both convex and concave portions by the land group recording method. As a result, the recording density was approximately doubled.

Further, a zone CLV system which simplifies the control of the CLV system (constant linear velocity recording) effective for improving the recording density and facilitates the practical use has been devised and put into practical use.

It is a major task in the future how to record AV data including image data using such optical disks aiming at increasing the capacity and to realize performance and new functions that greatly exceed conventional AV equipment.

With the advent of such a large-capacity and rewritable optical disk, it is conceivable that AV recording and reproduction will be mainly performed by optical disks instead of conventional tapes. The transition of recording media from tape to disk has various effects on the functions and performance of AV equipment.

The greatest feature in the transition to a disk is a significant improvement in random access performance. In the case of random access to the tape, it usually takes several minutes to rewind one tape. This is orders of magnitude slower than the seek time (several tens of ms or less) in optical disk media. Thus, tape cannot be a random access device in practice.

With such random access performance, distributed recording of AV data, which was impossible with a conventional tape, has become possible with an optical disc.

(Logic Configuration on DVD-RAM) First, DV
The logical configuration on the D-RAM will be described with reference to FIG. FIG. 8A shows a state in which a directory file on the disk indicated by the file system is held in the recording area.

In the recording area of the optical disk, a plurality of physical sectors are spirally arranged from the inner circumference to the outer circumference.

The physical sector of the optical disk constitutes three areas from the inner circumference to the outer circumference. There is a lead-in area at the innermost circumference, followed by a data area, and a lead-out area at the outermost circumference. Each sector has an address part and a data part. The address section stores address information for specifying the position of the sector on the optical disk and identification information indicating to which region the sector belongs. Digital data is stored in each data portion of the sector.

In the data portion of the sector in the lead-in area,
Information for initializing the playback device is stored. Typically, a reference signal necessary for stabilizing the servo, an identification signal with another medium, and the like are recorded.

In the data portion of the sector of the data area, digital data constituting an application stored on the disk is recorded.

[0191] The lead-out area is an area indicating the end of the recording area to the reproducing apparatus.

At the head of the data area, management information that constitutes a file system called volume information is recorded. The file system is index information for grouping and managing a plurality of sectors on the disk. Manage by grouping a plurality of sectors as files and a plurality of files as directories. In the embodiment of the present invention, a file system defined by ISO13346 is used.

In the present embodiment, the optical disk is
It has the directory / file structure shown in FIG.

As shown in FIG. 8 (a), all data handled by the DVD recorder is VID directly under the ROOT directory.
It is located under the EO_RT directory.

The file handled by the DVD recorder is roughly 2
One management information file and a plurality (at least one) of AV files are classified according to types.

(Management Information File) Next, the contents of the management information file will be described with reference to FIG.

In the management information file, V
It is divided into an OB table and a PGC table. VOB
(Video Object) is an MPEG program stream, and is a PGC (Program Cham).
in) defines the playback order of the Cell using an arbitrary partial section (or all sections) in the VOB as one logical playback unit. In other words, VOB is one unit having a meaning as MPEG, and PGC is one unit in which a player performs reproduction.

The VOB table contains the number of VOBs (Num
ber_of_VOBs) and each VOB information are recorded,
The VOB information includes a corresponding AV file name (AV_File).
_Name), the VOB identifier (VOB_
ID), the start address (VOB) in the AV file
_Start_Address), the end address (VOB_End_Address) in the AV file, V
OB playback time length (VOB_Playback_Tim)
e), stream attribute information (VOB_Attribute)
te).

The PGC table contains the number of PGCs (Num
ber_of_VOBs) and respective PGC information are recorded,
The PGC information is the number of cells in the PGC (Number_o).
f_Cells) and each Cell information.
The 11 information includes a corresponding VOB_ID, a reproduction start time in the VOB (Cell_Start_Time), and a reproduction time in the VOB (Cell_Playback_Tim).
e), playback start address in VOB (Cell_St)
art_Address), a reproduction end address in the VOB (Cell_End_Address), an audio flag (Audio_Flag) indicating the presence of audio data to be reproduced simultaneously when using a still image, and VOB_ID and Cell_Start_Tim extended for audio.
e, Cell_Playback_Time, Cell
_Start_Address, Cell_End_A
address.

The point to be noted here is the audio flag (Audio_Flag). The audio flag indicates whether or not there is audio output simultaneously with respect to the still image.

(AV File) Next, an AV file will be described with reference to FIG. An AV file is composed of a plurality (at least one) of VOBs, and the VOBs are recorded continuously on the disk, and the VOBs belonging to the same AV file are arranged continuously on the disk. The VOB in the AV file is managed by the VOB information of the management information file described above. The player first accesses the management information file and reads out the start address and end address of the VOB, thereby making it possible to access the VOB. In the VOB, Cell is defined as a logical reproduction unit. Cell is a partial playback section (or entire section) of the VOB, and can be freely set by the user. With this Cell, actual AV
Simple editing can be performed without performing data manipulation. Like VOB, access information to Cell is
It is managed in the Cell information in the management information file. The player can access the cell by first accessing the management information file and reading the start address and end address of the cell.

Since the address information of the cell is based on the VOB and the address information of the VOB is based on the AV file, the address information of the VOB is actually added to the address information of the cell, and the address information in the AV file is actually obtained. After calculating, the player accesses the AV file.

(Link Between Still Image Data and Audio Data) Next, a mechanism for synchronously reproducing a still image and audio will be described with reference to FIG.

FIG. 10A shows a part of the management information file described above. As shown in FIG. 10A, the Cell for a still image includes VOB access information (VOB_ID, COB) for still image data and audio data, respectively.
cell_Start_Time, Cell_Playb
ack_Time, Cell_Start_Addre
ss, Cell_End_Address).

The audio flag indicates whether or not there is audio data to be reproduced together with the still image data. Therefore, if the audio flag is set to 1, it indicates that there is audio data to be output together with the still image data, and the audio data V
This means that the OB access information exists in the Cell. When the audio flag is reset to 0, it indicates that there is no audio data output together with the still image data. With this configuration, it is possible to associate the still image data with the audio data.

FIG. 10B shows an AV file for still image data / audio data. In the AV file for still image data / audio data, a plurality of V
Although OBs are stored, each VOB is either a VOB for still image data or a VOB for audio data, and a VOB in which still image data and audio data are multiplexed is never stored. The VOB for still image data is different from the VOB for moving image data, and is composed of only a single I-picture video frame that has been compressed in a frame. The VOB for audio data is composed entirely of only audio data. Such a VOB for still image data and a VOB for audio data are respectively denoted by C
The reproduction control information of the still image and the audio data is configured by referring to the cell information and defining the reproduction order of the still image Cell by the PGC.

As described above, the still image data and the audio data can be freely combined by defining the reproduction order of the referred Cell with respect to the separately recorded still image data and the audio data.

In this embodiment, it has been described that one VOB, which is an MPEG stream, includes a VOB for video data and a VOB for audio data. However, the data structure is not limited to this as long as the audio data can be separated from the video data and the separated audio data can be replaced with other audio data. For example, one VOB may be composed of video data (video stream part) and audio data (audio stream part).
An example of this is shown in FIG. In this case, the still image data part (Video Part) is stored at the head of the VOB, and then the audio data part (Audio Part) is stored. FIG. 10C shows the RTR_ST shown in FIG.
O. An example of a VRO file is shown. The first system stream ST1 shown in FIG. 11 and the part (Video Part) of the still image data shown in FIG. 10C have the same concept, and both are called video part streams. Similarly, the second system stream ST2 shown in FIG.
Audio data part shown in 0 (c) (Audio Part)
Have the same concept, and are called audio part streams.

[0209] The file structure may be the structure shown in Fig. 8B. In this case, the VIDEO_RT directory corresponds to the DVD_RTR directory,
RTR.IFO, RTR_ directly under the RTR directory
STO.VRO, RTR_STA.VRO, RTR_MO
V. It consists of VRO files. RTR.IFO is a file corresponding to the management information file.
STO. VRO and RTR_STA. VRO is a file recorded in association with still image data. RTR_S
TO. VRO stands for still image data (Video Part) and audio data (Audi) recorded simultaneously with the still image data.
o Part). RTR_STA. VRO records only audio data (Audio Part) edited after recording, and RTR_STA. The VRO audio data is RTR_STO. It is recorded in association with the still image data recorded in the VRO. The moving image data is RTR_MOV. Recorded in VRO file.

(Still Image Data VOB and Audio Data VOB) As described above with reference to FIG. 11, the time stamps of the still image data VOB and the audio data VOB are as follows.

SCR1 = 0 SCR2 ≦ 27000000 (27 MHz) −Tp SCR3 = 27000000 (27 MHz) Tp = 55296 (27 MHz) PTS1 = PTS3 = 90000 + Tv DTS1 = 90000

(Description of DVD Recorder) Next, a DVD recorder will be described.

FIG. 1 is a block diagram of a drive device of a DVD recorder. In the figure, reference numeral 11 denotes an optical pickup for reading data from a disk, and 12 denotes an ECC (error c).
and 13 is a track buffer, 14 is a switch for switching between input and output to and from the track buffer, 15 is an encoder, 16 is a decoder, and 17 is an enlarged view of the disk.

As shown in FIG. 17, data is recorded on a DVD-RAM disk with 1 sector = 2 KB as a minimum unit. Also, assuming that 16 sectors = 1 ECC block,
The ECC processing unit 12 performs an error correction process.

Reference numeral 13 denotes a track buffer. By using the track buffer 13, it is possible to supply AV data discretely arranged on the disk to the decoder without interruption. This will be described with reference to FIG.

FIG. 2A is a diagram showing an address space on a disk. As shown in FIG. 2A, when AV data is recorded separately in a continuous area of [a1, a2] and a continuous area of [a3, a4], while the seek is performed from a2 to a3, the track is recorded. By supplying the data stored in the buffer to the decoder section, continuous reproduction of AV data becomes possible. FIG. 2B shows the state at this time.

The AV data read from a1 starts to be input to the track buffer and output from the track buffer at time t1, and the input rate to the track buffer (Va) and the output rate from the track buffer (Vb). The data is accumulated in the track buffer by the rate difference (Va-Vb). This state is a
2 (time t2). Assuming that the amount of data stored in the track buffer during this time is B (t2), B (t2) stored in the track buffer is consumed and supplied to the decoder until time t3 when reading of a3 can be started. Good.

In other words, if the data amount ([a1, a2]) to be read before the seek is at least a certain amount, continuous supply of AV data is possible even if a seek occurs.

In the present invention, the still image system stream and the audio system stream which are continuously processed by the decoder are not always arranged continuously on the disc. As shown in FIG. 20, the stream # for still image data
The stream for audio data that can be processed by the decoder consecutively with stream # 1 is stream # 2 and stream # 3.
Exist. For this reason, only one of them can be arranged on the disk continuously with stream # 1, and the other is
The stream # 1 is arranged in a discontinuous area on the disk.

However, as described above, a DVD recorder can supply two streams arranged discontinuously to a decoder without interruption. This allows the decoder to process two streams in succession,
The operation described with reference to FIG. 19 can be performed.

Although the example of reading data from the DVD-RAM, that is, the case of reproducing, has been described, the DVD-RAM
The same can be considered in the case of writing data to the memory, that is, in the case of recording.

As described above, in the DVD-RAM, as long as data of a certain amount or more is continuously recorded, continuous reproduction / recording is possible even if AV data is dispersedly recorded on the disk.

FIG. 12 is a block diagram of a DVD recorder.

In the figure, reference numeral 1201 denotes a user interface unit for displaying to a user and receiving a request from the user; 1202, a system control unit for managing and controlling the entire system; 1203, an input unit comprising a camera and a microphone; An encoder unit including a video encoder, an audio encoder, and a system encoder; an output unit 1205 including a monitor and a speaker; a decoder unit 1206 including a system decoder, an audio decoder and a video decoder;
Reference numeral 1207 denotes a track buffer, and 1208 denotes a drive.

The DVD recorder configured as described above will be described below with reference to the flowcharts of FIGS.
5, the recording operation of the DVD recorder will be described.

First, the user interface unit 1201 receives a request from the user. The user interface unit 1201 receives a request from a user,
2, the system control unit 1202 interprets the request from the user and makes a processing request to each module. If the request from the user is to capture and record a still image, the system control unit 1202 requests the encoder unit 1204 to encode one video frame and encode audio.

The encoder unit 1204 performs video encoding and system encoding of only one video frame sent from the input unit 1203, and outputs the video frame for still image data.
OB is generated and sent to the track buffer 1207. (S
1301) Specifically, as shown in FIG.
204 initializes various time stamp values. That is, the SCR is reset to 0, the PTS value and the DTS
The values are initialized and set to the respective values 93003 (90 kHz) and 90000 (90 kHz) described above. (S1
401) In the case of PAL, the PTS value is 9360
Initialized to 0 (90 kHz) and set.

If the recording of the still image data is not completed, the encoder 1204 converts the still image data into a packed packet structure. (S1404) If converted into a packed packet structure, the encoder unit 1
Reference numeral 204 denotes a time stamp of SCR / DTS / PTS, which is added to the still image data converted into a pack / packet structure. (S1405) At this time, 0 which is an initialization value is set as the SCR value in the first pack. Also,
9300 which is the above-mentioned initialization value as the PTS value and the DTS value
3 (90 kHz) and 90000 (90 kHz) are set. If the pack is the last pack, the SCR is 27
From 1,000,000 (27 MHz) to 1 pack transfer time (T
A time stamp is forcibly added so as to satisfy a time earlier than the time obtained by subtracting p).

The encoder unit 1204 determines whether the recording of the still image data is completed (S1402).
The system control unit 1202 informs the system control unit 1202 that the creation of the still image data VOB is completed, and the system control unit 1202 transfers the still image data VOB stored in the track buffer 1207 through the drive 1208 to the DVD-RAM.
Record on disc. (S1403) In this embodiment, VOBs for still images of all data are generated and recorded. However, VOBs for still images may be sequentially recorded in parallel with the generation.

After the encoding of the still image data is completed, the encoder unit 1204 determines whether or not audio data is recorded. If it is determined that the audio data is recorded, the encoder unit 1204 starts audio encoding of the audio data sent from the input unit 1203, The generated audio data VOB is sequentially transferred to the track buffer 1207. (S1302, S130
3)

More specifically, as shown in FIG. 15, the encoder 1204 sets the SCR value to 27000000 (27M
Hz) and the PTS value is initialized to 93003 (90 kHz). If the still image data to be reproduced at the same time is PAL, it is set to 93600 (90 kHz). (S1
501) If the recording of the audio data has not been completed, the encoder 1204 converts the audio data into a pack / packet structure (S1504), and calculates and adds a time stamp of the SCR / PTS. (S1505) At this time, the SCR value of the leading pack is 27000000 (27
MHz) and the PTS value is 93003 (90 kHz)
become.

The encoder unit 1204 judges whether the recording of the audio data is completed (S1502). If the recording is completed, the encoder unit 1204 notifies the system control unit 1202 and the system control unit 1212
02 is the track buffer 12 through the drive 1208
07 for the audio data stored in DV.
Record on a D-RAM disk. (S1503) In this embodiment, the audio data VOB of all data is generated and then recorded, but it may be sequentially recorded in parallel with the generation.

Until the user stops recording the stream,
The recorder records the still image data and the audio data on the DVD-RAM by the recording method described above.

The stop request from the user is sent to the system control unit 120 through the user interface unit 1201.
2, the system control unit 1202 sends a recording stop command to the encoder unit 1204, and the system control unit 1202
2 is the track buffer 12 through the drive 1208
07, all remaining VOBs stored in DVD-RA
Record on M disk.

After the end of a series of operations, the system control unit 120
2 creates the management information file shown in FIG. 9A including the above-described VOB table and PGC table, and records it on the DVD-RAM disc through the drive 1208. (S1304) When audio data is recorded at this time (S130)
In 5), the audio flag (Audio_Flag) is set to 1 (S1306), and is reset to 0 when no audio data is recorded. (S1307) Further, Cell playback time (Cell_Playback_Ti) for still image data and audio data
me) is set to the management information so as to match the audio playback time.

It is assumed that the still image data and the audio data are recorded on the DVD-RAM by adding the time stamp to the predetermined value by the recording method described above.

Next, FIG. 12 and FIG.
The playback device in the DVD recorder will be described with reference to FIG.

First, the user interface unit 1201 receives a request from the user. The user interface unit 1201 receives a request from a user,
2, the system control unit 1202 interprets the request from the user and makes a processing request to each module. If the request from the user is to play a disc, the system control unit 1202 reads the PGC table indicating the playback order from the management information file via the drive 1208.

The system control unit 1202 reads the read P
Predetermined PGC information is determined from the GC table. The system control unit 1202 reproduces the corresponding VOB according to the reproduction order indicated by the determined PGC information. Specifically, P
The GC information indicates the order of cell reproduction. Each cell has VOB_
It has information on the ID and the start address and end address of the VOB, and the information enables access to the still image data VOB. (S1601)

The system control unit 1202 determines the audio flag (Audio_Flag) corresponding to the still image data cell to be reproduced. (S1602)

If the system control unit 1202 determines that the audio flag (Audio_Flag) is 1, the system control unit 1202 extracts VOB information for audio extension from the Cell information,
That is, by reading out the VOB_ID, the start address and the end address of the VOB, the VOB for still image data is read out.
The audio data VOB to be reproduced synchronously with the audio data is read.
(S1603)

Since the address information of the Cell is based on the VOB and the address information of the VOB is based on the AV file, actually, the address information of the VOB is added to the address information of the Cell, and the address information in the AV file is added. After the calculation, the player records the AV recorded on the DVD-RAM.
Data can be read. (S1604)

When the audio flag is 0, that is, when only the still image data is reproduced, the display is continued for the time indicated by the corresponding Cell_Playback_Time in the management information file.

Note that, when the audio flag is 1, the processing by the continuous decoder for the still image data VOB and the audio data VOB is specifically performed as follows.

That is, the system control unit 1202 stores the still image data VOB first in the track buffer 1207.
If the audio flag is 1, the decoder 1206 requests the decoder unit 1206 to decode the still image data VOB using the time during which the audio data VOB is read into the track buffer 1207. Immediately after the reading of the audio data VOB is started, the decoder unit 1206
A decoding request. The decoder unit 1206 reads the MPEG stream stored in the track buffer 1207 and supplies decoded data to the output unit 1205. The output unit 1205 outputs the transmitted data to a monitor and a speaker at a specified reproduction time.

As described above, by pre-reading and decoding the still image data in advance, after starting to read the audio data, it is possible to synchronously reproduce the data at a specified reproduction time.

At this time, it is important that the VOB for still image data and the VOB for audio data are the same as the "VOB for still image data and VOB for audio data" described above.
, The decoder unit 1206
Means that it can be processed as one VOB composed of one still image data and audio data.

In the present embodiment, the DVD-RAM
However, the same applies to other media, and the present invention is not limited only to DVD-RAMs and optical disks.

In this embodiment, an audio stream has been described as an example of a stream that is reproduced simultaneously with a still image system stream. However, any information that can be combined with a still image system stream and an output is used. good. For example, it may be a system stream for sub-picture data such as composed of bitmap data or text data. As a typical use of these, it is used for caption information such as a title name which is overlapped and displayed on a photographed still image.

In the present embodiment, the link information between the still image data and the audio data is provided in units of cells, but one VOB is set to one cell, and
You may have it by B unit.

In this embodiment, the cell playback time (Cell_Playback_Time) information is the same between the still image data and the audio data. However, the information does not necessarily have to have the same value. For example, information for audio data is given priority. And the players have different Cell playback times (Cell_Playback).
When reading the (k_Time) information, it is sufficient to act so as to ignore the information for the still image data.

Also, in this embodiment, the VOB for still image data and the VOB for audio data are replaced with another VOB.
And recorded in the AV file separately, but may be recorded in the same AV file as other VOBs, and the present invention is not limited to the configuration of the AV file.

[0253]

According to the present invention, at least still image data and audio data are packed and MPEG
In an optical disc recorded in a separate area independently as a stream, the input start time (SCR2) of the last pack of the still image data to the decoder buffer and the input start time (SCR2) of the first pack of the audio data to the decoder buffer ( SCR3) is recorded using the time (Tp) required to transfer one pack so that the following equation is satisfied.

SCR2 + Tp ≦ SCR3

As a result, even if the still image data and the audio data are recorded independently of each other, the decoder can be processed as if it were one MPEG stream.

The start time (SCR1) of input of the first pack of the still image data to the decoder buffer and the start time (SCR2) of inputting the last pack of the still image data to the decoder buffer are as follows: SCR1 = 0 SCR2 + Tp ≦ 27000000 ( 27 MHz), the input start time (SCR3) of the first pack of the audio data to the decoder buffer is recorded as SCR3 = 27000000 (27 MHz), so that still image data and audio data created by different encoders are obtained. Also, there is an effect that the decoder can process as one MPEG stream.

The data display start time (PTS1)
By recording the display start time (PTS3) of the audio data and the audio data as the same value, it is possible to obtain an effect that the still image data and the audio data can be synchronously reproduced (display starts simultaneously).

In particular, the display start time (PTS1) of the still image data and the display start time (P
TS3) PTS1 = PTS3 = 90000 (90 kHz)
By setting z) + Tv, it is possible to obtain an effect that the decoder can synchronously reproduce still image data and audio data created by different encoders.

The management information of the still image data has an identification flag (Audio_Flag) indicating the presence of audio data to be reproduced synchronously, so that the optical disc player can identify the presence or absence of the audio data, and The effect that the synchronous reproduction of the data and the audio data becomes possible is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a drive device of a DVD recorder.

FIG. 2 is a diagram showing a relationship between an address space on a disk and a data accumulation amount in a track buffer.

FIG. 3 is a picture correlation diagram in an MPEG video stream.

FIG. 4 is a configuration diagram of an MPEG system stream.

FIG. 5 is a configuration diagram of an MPEG system decoder (P-STD).

6A is a diagram showing video data. FIG. 6B is a diagram showing a video buffer. FIG. 6C is a diagram showing an MPEG system stream. FIG. 6D is a diagram showing audio data.

FIG. 7 is a diagram showing a link between a still image and audio of a digital still camera.

8A is a diagram showing a directory structure. FIG. 8B is a diagram showing a physical arrangement on a disk.

9A is a diagram showing management information data. FIG. 9B is a diagram showing stream data.

10A is a diagram showing still image data and management information data for audio data. FIG. 10B is a diagram showing still image data and stream data for audio data.

11A is a diagram showing a VOB for still image data, FIG. 11B is a diagram showing a VOB for audio data, and FIG. 11C is a diagram showing a composite VOB

FIG. 12 is a configuration diagram of a DVD recorder.

FIG. 13 is a flowchart of a recording process of a DVD recorder.

FIG. 14 VOB for still image data of a DVD recorder
Flow chart of the process for

FIG. 15 VO for audio data of DVD recorder
Flow chart of the process for B

FIG. 16 is a flowchart of processing for a management information file of the DVD recorder.

FIG. 17 is an explanatory diagram showing a state in which two still images are stored.

FIG. 18 is an explanatory diagram showing an operation of reproducing a still image with sound based on a conventional example.

FIG. 19 is an explanatory diagram showing an operation of reproducing a still image with sound according to the present invention.

FIG. 20 is an explanatory diagram showing a modification of the operation of reproducing a still image with sound according to the present invention.

[Explanation of symbols]

 Reference Signs List 11 optical pickup 12 ECC processing unit 13 track buffer 14 switch 15 encoder unit 16 decoder unit 41 pack header 42 packet header 43 payload 51 STC 52 demultiplexer 53 video buffer 54 video decoder 55 reorder buffer 56 switch 57 audio buffer 58 audio decoder 1201 user Interface unit 1202 System control unit 1203 Input unit 1204 Encoder unit 1205 Output unit 1206 Decoder unit 1207 Track buffer 1208 Drive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/93 H04N 5/93 G G11B 27/10 Z

Claims (21)

[Claims] 1. An optical disc reproducible by a reproducing apparatus including a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56), wherein the optical disc includes at least A video part stream (S) composed of a plurality of units including still image data of one picture
T1), and an audio part stream (ST2) composed of one or a plurality of units including audio data reproduced together with the still image data are recorded. The unit includes a time required for decoding and output. Time stamp information indicating the time SCR2 at which the last unit of the first system stream is input (53) to the decoder buffer, and the first time of the second system stream. A time SCR3 at which the unit is input to the decoder buffer (57) is included. Between these times SCR2 and SCR3, the following equation is obtained: SCR2 + Tp ≦ SCR3, where Tp is the time at which one unit starts inputting to the decoder buffer. The time required from input to completion of input Optical disc, characterized in that to, is established. 2. The time stamp information further includes a time SCR1 at which the first unit of the video part stream is input to the decoder buffer. For these times SCR1 and SCR2, the following expression SCR1 = 0 SCR2 + Tp ≦ 27000000 (27MHz) However, (27MHz) means that the numerical value shown before that is 2
2. The optical disk according to claim 1, wherein a value indicating a count value of a 7 MHz clock is satisfied. 3. The optical disc according to claim 2, wherein the following equation is satisfied for the time SCR3: SCR3 = 27000000 (27 MHz). 4. The time stamp information further includes a time PTS1 at which the video part stream is output from the output unit (55, 56) and a time PTS at which the audio part stream is output from the decoder (58).
4. The optical disc according to claim 1, wherein the time PTS1 and the time PTS3 have the same value. 5. The time stamp information further includes a decoding start time DTS1 at which the video part stream is decoded by the decoder (53). The time DTS1 is expressed by the following equation: DTS1 = 90000 (90 kHz). (90 kHz) means that the value indicated before is 9
The optical disc according to any one of claims 1 to 4, wherein the following condition is satisfied: indicating a count value of a clock of 0 kHz. 6. The times PTS1 and PTS3 are expressed by the following equation: PTS1 = PTS3 = 90000 (90 kHz)
z) + Tv where (90 kHz) is 9
0 kHz clock count value, T
5. The optical disk according to claim 4, wherein v indicates a frame period of video data. 7. The optical disc further records first audio part stream management information (Volume). The management information of the video part stream includes audio data of audio data to be reproduced in synchronization with the still image data. The optical disc according to any one of claims 1 to 6, wherein an identification flag (Audio_Flag) indicating presence is stored. 8. Still image data and said still image data are recorded on an optical disk reproducible by a reproducing apparatus having a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56). An optical disk recording apparatus for recording a system stream including audio data reproduced together with the encoder, wherein the recording apparatus has an encoder (1204) and a system control unit (1202). The encoder (1204) A video part stream (S) composed of a plurality of units including still image data of at least one picture
T1), and an audio part stream (ST2) composed of one or more units including audio data reproduced together with the still image data. The encoder (1204) performs decoding processing and Time stamp information indicating a time required for output is stored, and the time stamp information includes a time SCR2 at which the last unit of the first system stream is input to the decoder buffer (53); And the time SCR3 at which the first unit of the system stream is input to the decoder buffer (57). Between these times SCR2 and SCR3, the following equation is obtained: SCR2 + Tp ≦ SCR3 where Tp is stored in the decoder buffer. Input ends after one unit starts inputting An optical disc reproducing apparatus characterized in that the following expression is satisfied: 9. The encoder further includes, as the time stamp information, a time SCR1 at which the first unit of the video part stream is input to the decoder buffer (53), and the video part stream is output to the output unit (55, 56) is stored, and for these times SCR1, SCR2, and PTS1, the following expression is used: SCR1 = 0 SCR2 ≦ 27000000 (27 MHz) −Tp PTS1 = 90000 (90 KHz) + Tv (27 MHz) The number shown earlier is 2
Indicates that it is a count value of a 7 MHz clock,
(90 KHz) means that the numerical value indicated before that is 90 KHz
Tp indicates the time required to transfer the last unit of the video part stream, and Tv indicates the frame period of the video data. 9. The optical disk recording device according to claim 8, wherein: 10. The encoder further stores, as the time stamp information, a time PTS3 at which the audio part stream is output from the decoder (58). For these times SCR3 and PTS3, the following equation is used: SCR3 = 27000000 (27 MHz) 10. The optical disk recording apparatus according to claim 9, wherein PTS3 = 90000 (90 KHz) + Tv is satisfied. 11. The system management unit first generates management information of an audio part stream, and detects presence of audio data reproduced in synchronization with the still image data in the management information of the video part stream. 11. The optical disk recording apparatus according to claim 8, wherein an identification flag (Audio_Flag) is stored. 12. The system management unit according to claim 8, wherein the system management unit records a reproduction time (Cell_Playback_Time) of the audio data in the management information of the audio part stream. Optical disk recording device. 13. A reproducing apparatus for reproducing data from an optical disk according to claim 7, comprising: a decoder buffer (53, 57); a decoder (54, 58); an output section (55, 56); (51), and the system control unit (51) includes the identification flag (Aud).
An optical disc reproducing apparatus characterized in that, when a set state of (io_Flag) is detected, the still image data of the video part stream and the audio data of the audio part stream are synchronously reproduced. 14. When the system control section (51) detects the set state of the identification flag (Audio_Flag), the still image data of one picture recorded in the video part stream by the decoder (54). Is completely decoded and sent to an output unit (55, 56). Subsequently, the decoder (58) decodes the audio data stored in the audio part stream and reproduces the audio, and reproduces the audio. 14. The optical disk reproducing apparatus according to claim 13, wherein the reproduction of the still image data from the output section is started simultaneously with the start of the operation. 15. Still image data and said still image data are recorded on an optical disk reproducible by a reproducing apparatus having a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56). Recording a system stream including audio data to be reproduced together with a video part stream (S) comprising a plurality of units including still image data of at least one picture.
T1), recording an audio part stream (ST2) including one or a plurality of units including audio data reproduced together with the still image data, and decoding processing and output to the unit. Recording time stamp information indicating a required time, the time SCR2 at which the last unit of the first system stream is input to the decoder buffer (53) as the time stamp information, The first unit of the second system stream generates a time SCR3 which is input to the decoder buffer (57). Between these times SCR2 and SCR3, the following equation is obtained: SCR2 + Tp ≦ SCR3 where Tp is the decoder One unit starts inputting to buffer Recording method characterized by that after shows the time required for the input termination, is established. 16. The time stamp information further includes a time SCR1 at which the first unit of the video part stream is input to the decoder buffer (53), and the video part stream is output to the output unit (55, 56).
And the time PTS1 output from the PTC1 is generated. For these times SCR1, SCR2, and PTS1, the following expression is used. The number shown is 2
Indicates that it is a count value of a 7 MHz clock,
(90 KHz) means that the numerical value indicated before that is 90 KHz
Tp indicates the time required to transfer the last unit of the video part stream, and Tv indicates the frame period of the video data. 16. The recording method according to claim 15, wherein the recording method is performed. 17. The audio part stream further includes the audio part stream as the time stamp information.
17. The recording method according to claim 16, wherein a time PTS3 output from the PTS3 is generated, and for the times SCR3 and PTS3, the following expression is satisfied: SCR3 = 27000000 (27 MHz) PTS3 = 90000 (90 KHz) + Tv. 18. The method of claim 1, further comprising the step of recording management information of the audio part stream, wherein the management information of the video part stream indicates the presence of audio data reproduced in synchronization with the still image data. Identification flag (A
18. The recording method according to claim 15, wherein (audio_Flag) is generated. 19. A reproduction time (Cell_P) of the audio data in the management information of the audio part stream.
19. The optical disk recording apparatus according to claim 18, wherein (backback_Time) is generated. 20. A reproduction method for reproducing a system stream recorded on an optical disk according to claim 7, wherein: in the management information of the still image data of one picture,
Detecting a set state of an identification flag (Audio_Flag) indicating presence of audio data reproduced in synchronization with the still image data; and responding to the detection of the set state of the identification flag, the still image data; An optical disk reproducing method, comprising a step of synchronously reproducing the audio data. 21. The step of synchronously reproducing comprises, in response to detection of a set state of the identification flag (Audio_Flag), completely decoding still picture data of the one picture; 21. The optical disk reproducing method according to claim 20, wherein the step of decoding and reproducing the audio data and the reproduction of the decoded still image data are started simultaneously with the start of the reproduction of the audio.