JP3411232B2 - Optical disc, recording device and method, and reproducing device and method - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

In recent years, digital still cameras capable of capturing still images and corresponding sounds have been introduced. Since it is possible to record audio corresponding to still images at the same time, it is possible to make further differentiation compared to the conventional film type still camera.

FIG. 7 is a diagram showing the 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 each. JPE in one shooting (and recording)
One G data file and one audio data file
Files are created one by one.

The relation between the still image data (JPEG data) and the audio data is roughly performed by the following two methods. The first is a method of having link information to each of the JPEG data file and the audio data file, as shown in FIG. 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-mentioned method, the audio data corresponding to the still image data can be associated not only when the still image data is recorded but also after the recording.

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

In recent years, with the advent of the multimedia age of integrated handling of AV data such as moving images, still images, and audio data, MPEG (Moving Picture Experts Group) is widely used as a core technique (information compression technique) of multimedia. Came to be.

[0010]

When recording an image or audio using the above-mentioned MPEG, the MPEG stream is multiplexed into a system stream by multiplexing a video stream and an audio stream as shown in FIG. 6 (c). Therefore, it is difficult to freely combine the audio streams after recording the video streams. That is, when changing the audio data combined with the still image data, it is necessary to handle the still image data and the audio data as one MPEG stream. For that purpose, the MPEG system stream must be decoded, and the still image data and the audio data respectively taken out must be system-encoded again. As in the digital still camera described in the prior art, the still image data and the audio data must be re-encoded. There is a problem that it is difficult to freely combine and use the data after recording.

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

[0012]

[Means for Solving the Problems] A first aspect of the present invention is
The decoder buffer (53, 57) and the decoder (54,
58) and management information for managing one or more recording areas on the disc as a file on an optical disc reproducible by a reproducing device having an output unit (55, 56), still image data, and the still image data. An optical disc recording apparatus for recording a system stream including audio data reproduced together with image data, the optical disc recording apparatus including an encoder (1204) and a system control unit (1202). ) Is
One or a plurality of units including a video part stream (ST1) composed of a plurality of units containing still image data of one picture and recorded as a part of a file, and audio data reproduced together with the still image data. And an audio part stream (ST2) recorded as a part of a file, and the encoder (1204) stores time stamp information indicating a time required for decoding processing and data output in the unit. However, the time stamp information includes
Time SCR2 at which the last unit of the video part stream is input to the decoder buffer (53)
And the time SCR at which the first unit of the audio stream is input to the decoder buffer (57).
3 is included, and between these times SCR2 and SCR3, the following equation: SCR2 + Tp ≤ SCR3 where Tp represents the time required from the start of inputting one unit to the decoder buffer until the end of inputting, And the above units of the video part stream are continuously arranged in the above file,
The optical disk recording apparatus is characterized in that the units of the audio part stream are also continuously arranged in the file.

As a result, the second audio data is stored.
The system stream is the first stream where still image data is stored.
Since it is stored independently without being multiplexed with one system stream, it is possible to easily rewrite only the second system stream.

According to a second aspect of the present invention, the encoder further uses, as the time stamp information, a time SCR1 when the first unit of the video part stream is input to the decoder buffer (53) and the video part stream. Stores the time PTS1 output from the output unit (55, 56), and stores the time SCR1, S
Regarding CR2 and PTS1, the following equation SCR1 = 0 SCR2 ≦ 27000000 / (27MHz) −Tp PTS1 = 90000 / (90KHz) + Tv However, (27MHz) indicates a count value of the 27MHz clock, and (90KHz) is , 90K
It shows that it is the count value of the clock of Hz, Tp
Is the time required to transfer the last unit of the video part stream, and Tv is the frame period of the video data. The optical disc recording apparatus according to claim 1, wherein

Thus, the time when the first system stream starts to be transferred to the decoder buffer is set to 0, the time when the first system stream is transferred to the decoder buffer is set to 1 second or less, and a still image is displayed. The time can be set to 1 second and a time obtained by adding 1 frame period Tv.

According to a third aspect of the present invention, the encoder further stores, as the time stamp information, a time PTS3 at which the audio part stream is output from the decoder (58). 3. The optical disk recording apparatus according to claim 2, wherein the following expression SCR3 = 27000000 / (27 MHz) PTS3 = 90000 / (90 KHz) + Tv is established.

As a result, the time when the second system stream starts to be transferred to the decoder buffer is set to 1 second, and the time when the audio is decoded and reproduced by the decoder is set to 1 second and a time obtained by adding 1 frame period Tv. Can be set.

According to a fourth aspect of the present invention, the system control unit generates management information of video and audio part streams, and is reproduced in the management information of the video part streams in synchronization with the still image data. Identification flag (Audio_Fla) indicating the presence of audio data
The optical disc recording apparatus according to claim 1, wherein g) is stored.

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

According to a fifth aspect of the present invention, the system control section includes a reproduction time (Cell_Play) of the audio data in the management information of the audio part stream.
2. The optical disc recording apparatus according to claim 1, wherein the optical disc recording apparatus records the back_time).

With this, it is possible to set the reproduction time of the voice.

According to a sixth aspect of the present invention, a still image is recorded on an optical disc which can be reproduced by a reproducing apparatus including a decoder buffer (53, 57), a decoder (54, 58) and an output section (55, 56). An optical disc recording method for recording a system stream including data and audio data reproduced together with the still image data, wherein the optical disc recording method manages one or more recording areas on the disc as a file. A step of recording management information, and a video part stream (ST) composed of a plurality of units including still image data of one picture.
1) is recorded as a part of a file, and an audio part stream (ST2) composed of one or a plurality of units including audio data reproduced together with the still image data is recorded as a part of the file. And a time stamp information recording step of recording time stamp information indicating a time required for decoding processing and output in the unit, wherein the last unit of the video part stream is the time stamp information. Decoder buffer (5
3) includes a time SCR2 input to the decoder buffer (57) and a time SCR2 input to the decoder buffer (57) of the first unit of the audio part stream, and between these times SCR2 and SCR3, the following equation: SCR2 + Tp = SCR3 However, Tp indicates the time required from the start of inputting one unit to the decoder buffer until the end of inputting, and the above units of the video part stream are continuously arranged in the above file. Out,
The optical disk recording method is characterized in that the units of the audio part stream are also continuously arranged in the file.

As a result, the second audio data is stored.
The system stream is the first stream where still image data is stored.
Since it is stored alone without being multiplexed with one system stream, it is possible to easily rewrite only the second system stream.

According to a seventh aspect of the present invention, as the time stamp information, a time SCR1 at which the first unit of the video part stream is (53) input to the decoder buffer, and the video part stream is output from the output unit. Including the time PTS1 output from (55, 56), and regarding these times SCR1, SCR2, and PTS1, the following equation SCR1 = 0 SCR2 = 27000000 / (27 MHz) −Tp PTS1 = 900000 / (90 KHz) + Tv However, (27 MHz ) Indicates that it is the count value of the clock of 27 MHz, and (90 KHz) is 90 K.
It shows that it is the count value of the clock of Hz, Tp
Is the time required to transfer the last unit of the video part stream, and Tv is the frame period of the video data. The optical disc recording method according to claim 6, wherein

Thus, the time when the first system stream starts to be transferred to the decoder buffer is set to 0, the time when the first system stream is transferred to the decoder buffer is set to 1 second or less, and a still image is displayed. The time can be set to 1 second and a time obtained by adding 1 frame period Tv.

An eighth aspect of the present invention further includes, 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 expression SCR3 = 27000000. 8. The optical disc recording method according to claim 7, wherein the following condition is satisfied: / (27 MHz) PTS3 = 90000 / (90 KHz) + Tv.

As a result, the time when the second system stream starts to be transferred to the decoder buffer is set to 1 second, and the time when the audio is decoded and reproduced by the decoder is set to 1 second and a time obtained by adding 1 frame period Tv. Can be set.

A ninth aspect of the present invention further comprises a management information recording step of recording management information of video and audio part streams, wherein the management information of the video part stream is synchronized with the still image data. An identification flag (Audi) indicating the presence of reproduced audio data.
7. The optical disc recording method according to claim 6, further comprising the step of: generating o_Flag).

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

A tenth aspect of the present invention is that the reproduction time (Cell_Playback_Tim) of the audio data is further included in the management information of the audio part stream.
7. The optical disk recording method according to claim 6, wherein e) is stored.

This makes it possible to set the audio reproduction time.

An eleventh aspect of the present invention relates to an optical disc which can be reproduced by a reproducing device including a decoder buffer (53, 57), a decoder (54, 58) and an output section (55, 56). The optical disc is composed of management information for managing one or more recording areas on the disc as a file and a plurality of units including still image data of one picture, and is recorded as a part of the file. Audio part stream (ST1), and one or more units containing audio data reproduced together with the still image data, and recorded as a part of a file.
T2) is recorded, time stamp information indicating a time required for decoding processing and data output is stored in the unit, and the last unit of the video part stream is stored in the decoder buffer in the time stamp information. (53) The time SCR2 to be input and the time SCR3 to which the first unit of the audio part stream is input to the decoder buffer (57) are included. Between these times SCR2 and SCR3, the following equation: SCR2 + Tp ≤ SCR3 However, Tp is the time required from the start of input of one unit of the video part stream (ST1) to the decoder buffer until the end of input, and the above unit of the video part stream is The files are arranged consecutively in the file, The optical disk is characterized in that the units of the oppart stream are also arranged in series in the file.

As a result, the second audio data is stored.
The system stream is the first stream where still image data is stored.
Since it is stored alone without being multiplexed with one system stream, it is possible to easily rewrite only the second system stream.

In a twelfth aspect of the present invention, the time stamp information further includes a time S at which the first unit of the video part stream is input to the decoder buffer.
CR1 is included, and for these times SCR1 and SCR2, the following equation SCR1 = 0 SCR2 + Tp ≦ 27000000 / (27 MHz)
= 1 sec. However, the optical disc according to claim 11, wherein (27 MHz) is a count value of a 27 MHz clock.

With this, it is possible to set the time length in which the entire first system stream is transferred to the decoder buffer to 1 second or less.

A thirteenth aspect of the present invention is the time SCR.
For S.3, the following expression SCR3 = 27000000 / (27 MHz) = 1
sec. 13. The optical disc according to claim 12, wherein:

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 fourteenth aspect of the present invention, the time stamp information further includes a time PTS1 at which the video part stream is output from the output section (55, 56),
If the audio part stream is the decoder (5
The optical disc according to claim 11, wherein the time PTS3 outputted from 8) is included, and the times PTS1 and PTS3 have the same value.

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

In a fifteenth aspect of the present invention, the time stamp information further includes a decoding start time DTS1 at which the video part stream is decoded by the decoder (53), and the time DTS1 is the following expression DTS1. = 90000 / (90 kHz) = 1 sec. However, the optical disc according to claim 11, wherein (90 kHz) is a count value of a clock of 90 kHz.

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

A sixteenth aspect of the present invention is the time PTS.
1, PTS3 is expressed by the following equation PTS1 = PTS3 = 90000 / (90 kHz
z) + Tv, where (90 kHz) indicates a count value of a 90 kHz clock, and Tv indicates a frame period of video data. The optical disc according to claim 14, wherein:

As a result, the display of the still image on the screen and the output of the sound can be performed at 1 second after the first system stream is started to be transferred to the decoder buffer and at the time when one frame period Tv is added.

According to a seventeenth aspect of the present invention, management information (Volume information) for video and audio part streams is further recorded on the optical disc, and the management information for the video part streams is synchronized with the still image data. 12. The optical disc according to claim 11, further comprising an identification flag (Audio_Flag) indicating the presence of audio data to be reproduced.

With this identification flag, for still images,
It is possible to determine whether or not the voices of simultaneous reproduction are attached.

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

BEST MODE FOR CARRYING OUT THE INVENTION As one embodiment of the present invention, a DVD-RA as a recording medium for an MPEG stream will be described below.
The details of the DVD recorder using M will be described.

(Description of Normal MPEG Stream) First, a normal MPEG stream (AV data) will be described. Since the structure of a normal MPEG stream is obvious to those skilled in the art, the description will focus on the part that is deeply related to the present invention.

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

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

The first is the compression of moving image data.
In addition to the conventional compression method using a spatial frequency characteristic for removing a redundant component within one frame, a compression method using a temporal correlation characteristic for removing a redundant component between frames is adopted. In MPEG, each frame (also referred to as a picture in MPEG) is an I picture (intra-frame encoded picture), a P picture (intra-frame encoded picture using a reference relationship from the past), and a B picture (intra-frame encoded picture). Data compression is performed by classifying into three types (pictures using reference relationships from past and future).

FIG. 3 is a diagram showing the relationship between 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 future, respectively. Also, as shown in FIG. 3, since a B picture refers to a future I or P picture, the display order of each picture (display order) and the coding order of compressed data (coding order) do not match. Occurs.

The second characteristic of MPEG is that dynamic code amount allocation according to the complexity of an image can be performed in picture units. The MPEG decoder has an input buffer,
By storing data in advance in this decoder buffer, a large amount of code can be assigned 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 reproduced with a moving image. Further, in MPEG, in addition to the above-mentioned MPEG audio, it is allowed to use various encoding types for each application.

Audio data encoding types used in the present invention include data compression type and data non-compression type. MPEG audio and Dolby Digital (AC-
3), and LPCM is an uncompressed type.
Although Dolby Digital and LPCM have a fixed bit rate, MPEG audio is not as large as a video stream, but it 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 the MPEG system. The multiplexed moving image data and audio data are called a system stream in MPEG. Data in a state in which 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. The MPEG system stream has a hierarchical structure called a pack or a packet.

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 is an ID (stream I) for identifying the type of data stored in the payload 43.
The time stamp at the time of reproduction of the data contained in the payload described with D) and the accuracy of 90 kHz is stored. The type of data indicated by the ID includes moving images and voice. Also, the decoding time DTS (De
coding Time Stamp) and display time PTS (Presentation Time Stamp)
mp) is recorded. When audio data is decoded and displayed at the same time, storage of DTS is omitted.

A pack is a unit that collects a plurality of packets. In the case of the present embodiment, 1 packet is 1
Composed of packs. A pack is a pack header 41 and a packet (packet header 42 and payload 43)
Composed of.

In the pack header, the SCR (System Clock Re) in which the time when the data in the pack is input to the decoder buffer is described with an accuracy of 27 MHz.
(fence) is recorded.

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

FIG. 5 shows a decoder model (P-STD) of the MPEG system decoder.
Shows the details of. 51 is ST which is the reference time in the decoder
A system control unit equipped with C (System Time Clock), 52 is a system stream decode,
That is, a demultiplexer for demultiplexing, 53 is a video buffer of a video decoder, 54 is a video decoder, and 55 is I, in order to absorb the difference between the data order and the display order occurring between P picture and B picture, A reorder buffer for temporarily storing P pictures, 56 is a switch for adjusting the output order of I, P pictures 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 aforementioned MPEG system stream by the MPEG system decoder will be described below. The pack needs to be input to the demultiplexer 52 when the time of the STC 51 matches the SCR described in the pack header. 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 payload data 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 time of the STC 51 coincides with the DTS, 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 as they are in the temporary reorder buffer 55 without being output.

The switch 56 corrects the difference between the decoding order and the output display order described above with reference to FIG. That is, 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 side is output to the outside, and in the case of I and P pictures, switching is performed to output the output from the reorder buffer 55 side to the outside.

The I picture cannot be output at the same time as the decoding because it is reordered due to the correction of the difference between the decoding order and the output order. 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, one video frame period.

Like the video decoder 54, the audio decoder 58 takes out one audio frame of data from the audio buffer 57 and decodes it at the time when the time of the STC 51 and the PTS (there is no DTS in the case of audio) match.

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

(Problem of Normal MPEG Stream) It is considered that the still image camera using the normal MPEG stream described above does not actually exist as a product due to the problem described later. However, for convenience of explaining the problem,
This is assumed and it demonstrates below.

FIG. 17 and FIG. 18 show the relationship between the reproduction operation by the decoder of the MPEG stream by the assumed still image camera and each time stamp (STC, PTS, DTS).
Will be explained. For the configuration of each decoder, refer to the configuration shown in FIG.

FIG. 17 is a diagram for explaining the operation of reproducing the data taken in by the still image camera on the PC. FIG. 17
(A) shows the screen displayed on the display of the PC.
In the figure, Photo # 1 and Photo # 2 are individually displayed as icons as files. In GUI (Graphical User Interface) such as Windows95, by clicking the displayed file with a mouse, which is 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. It can be output from the speaker. FIG. 17B shows a state in which the contents of Photo # 1 and Photo # 2 are output.

As shown in FIG. 17B, when the Photo # 1 file 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 Photo # 2 file is clicked, Stillpicture # 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 diagram 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 in which Still picture # 1 which is a still picture of Photo # 1 and Audio # 1 which is a sound are respectively output. Figures 18 (c) and 18 (d) show Still
The transitions of the buffer occupancy of the audio decoder buffer 57 and the video decoder buffer 53 when picture # 1 and audio # 1 are respectively decoded and output are shown.
FIG. 18E shows the pack arrangement and the respective time stamps (SCR, PTS, DTS) stored in the pack when Photo # 1 is stored in the disc as stream # 1 which is an MPEG stream.

For convenience of explanation, the packet in the pack is not shown, but the DTS and PTS are present in the packet header in the packet, as described above. Also,
Similarly, there are 4 video packs and 2 audio packs, but since the pack data amount is only 2 KB,
In reality, there are 100 or more video packs and 100 audio packs, respectively. It goes without saying that these are obvious to those skilled in the art.

As the first description of the assumed reproduction operation of the still image camera, first, stream # 1 shown in FIG.
The operation in which each pack constituting the above is transferred to the demultiplexer 52 will be described.

Stream # 1 as shown in FIG.
Has a configuration in which each pack is multiplexed from the top in the order of video pack V1, video pack V2, audio pack A1, video pack V3, video pack V4, audio pack A2.

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 recorded in the SCR # 1 of the video pack V1, the time t2 is recorded in the SCR # 2 of the video pack V2, the time t3 is recorded in the SCR # 4 of the audio pack A1, and the video pack V is recorded.
The time t4 is the SCR # 3 of video pack V4
In CR # 5, the time t5 is the SC of the audio pack A2.
Time t8 is set in R # 6 as an SCR value.

Further, PTS and DTS are set in the head pack of a picture. The time t7 is set in the PTS # 1 of the video pack V1, and the time t6 is set in the DTS # 1.
Video packs other than the first pack of a picture are PT
It is not set because S and DTS are the same.

A PTS is set in each audio pack. The time t is recorded in the PTS # 1 of the audio pack A1.
7 is time t9 in PTS # 2 of audio pack A2.
Is set. In the case of audio data, PTS
And DTS are the same, the value is set only for PTS.
Is omitted.

Each pack forming the stream # 1 is reset to the SC of each pack after the STC is reset at the time t1 which is the value of the SCR # 1 of the video pack V1 which is the first pack.
It is input to the demultiplexer 52 at the timing indicated by the R value.

That is, as shown in FIG. 18E, the video pack V1 is initially 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 the audio pack A2 is at time t8.
Then, each is 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 is output to the audio buffer 57.

Next, as a second description of the assumed reproduction operation of the still image 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 delay that can be ignored, but at the timing of SCR, that is, at time t1, time t2, time t4, and time t5. It is stored in the video buffer 53. Still picture Still picture # 1 is composed of video packs V1 to V4. Therefore, if video pack V4 is accumulated in video buffer 53, still picture Stil
This means that all the data that makes up picture # 1 has been accumulated in the video buffer 53. As shown in FIG. 18 (e), a still picture Still picture # 1 composed of video packs V1, V2, V3, and V4 has time t6 as a DTS value. Therefore, the accumulated data is decoded by the video decoder 54 at the timing of time t6, and the buffer occupation amount of the video buffer is reduced.

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

The end of displaying Still picture # 1 is not specified as a time stamp on the MPEG stream. Generally, the next MPEG stream is erased when the reproduction is started, and the video output is generally ended by the control of the decoder from the outside such as an application. Therefore, in the example shown in FIG. 18, Still picture # 1 is displayed even after the time t10 when the audio output ends.

As a third explanation of the assumed reproduction operation of the still image camera, the relation between the operation of decoding and outputting the data of the audio pack 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 timing of time t8, the audio buffer 57 is accumulated and the occupied amount of the audio buffer 57 increases. Unlike video data, audio data is PT
Since S and DTS are equal, the audio decoder 57 decodes the data of each pack and outputs the audio at the same time. That is, the data of the audio pack A1 accumulated in the audio buffer 57 is decoded by the audio decoder 57 at the timing of time t7 which is the PTS value, and audio output is started. Further, the data of the audio pack A2 accumulated in the audio buffer 57 at the timing of time t8 is decoded by the audio decode 57 at the timing of time t9 which is the PTS value, and is output as voice.

In MPEG, the time during which data can be stored in each buffer of the decoder is limited. This predetermined time is defined as 1 second for moving image data.

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

(Problem of MPEG Stream) The present inventor has, through many years of research and development, extracted and arranged the problem when the above-mentioned normal MPEG stream is used in a still image camera.

The MPEG system stream generated by multiplexing the video data and the audio data reproduced together with the video data is edited by changing the audio data reproduced together with the generated audio data into other audio data. Is difficult That is, it is difficult to edit the sound at the time of shooting to another sound after the still image and the sound are shot by the still image camera and the data is stored as the MPEG stream in the recording medium.

For example, in the example shown in FIG. 17, Photo #
1 is the still image data when shooting with a still image camera.
It is recorded on the disc as an MPEG stream composed of picture # 1 and audio # 1 which is audio data. The generated MPEG stream has a structure in which a video pack and an audio pack are multiplexed, as shown in FIG. For this reason, the user can capture the audio data of Photo # 1 by Audio # 1 after shooting once.
It is difficult to change from to other audio data.

The following three methods are conceivable as a method of performing rearrangement and editing of sound after photographing.

1) A method is conceivable in which an MPEG stream in which audio data that may be combined in advance with video data that is captured still image data is combined to generate an MPEG stream and all of these are stored in a recording medium. For example, in the case of the example shown in FIG. 18, in addition to the stream # 1 shown in FIG. 18 (e), it is possible to separately store a stream in which only the audio pack is changed. However, in this case, since the recording capacity of the recording medium has an upper limit, the recordable MPEG stream also has a limit. In any case, it is virtually impossible for the user to determine all the sounds that may be combined with the 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, and the extracted still image data and the changed audio data are system-encoded again. However, in this case, decoding and encoding must be performed each time editing is performed, which takes time to edit. In addition, a large memory is required for the still image camera in order to store one system stream in the decoded state.

3) The video stream and the audio stream are divided into two streams in advance and stored in the recording medium. 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 additionally recorded audio data can be used as audio data to be reproduced together with the still image.

The inventor adopted this 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, in order to reproduce two MPEG streams of still image data and audio data which are separately present as described above, by one decoder as in the conventional case, It is necessary to have the decoder process the two MPEG streams as one system stream.

The biggest problem in processing two MPEG streams as if they were one MPEG stream is that the two streams are independently time stamped, and the two streams are consecutive as one stream. However, in the case of the automatic processing, a contradiction such as discontinuity occurs between the time stamps given to the respective streams.

The time stamp in the MPEG stream is added by the multiplexing process, but in the case of a normal MPEG stream, the initial value of the time stamp (the SCR added at the very beginning) is not specified by the standard, and it is determined by the encoder. The actual situation is to take a unique value. Therefore, naturally, there is no continuity or correlation between time stamps between MPEG streams created by different encoders. For example, an MPEG stream encoded by an encoder A having an SCR initial value of 0 is stream A, and an MPEG stream encoded by an encoder B having an SCR initial value of 1000 is stream B. Further, the SCR value of the last pack of stream A is set to 27000000 (27 MHz).
Here (27MHz), the value shown before is 27
Indicates a count value of the MHz clock. It is assumed that the stream A and the stream B are continuously processed by the decoder as if they were one stream. in this case,
S from the end of stream A to the beginning of stream B
CR discontinuity occurs, and there is a high possibility that the decoder will malfunction such as hang-up.

Therefore, 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 of the present invention will be described below.

FIG. 11 is a view 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 the still image data system stream ST1. In the first pack, SCR1 is stored in the pack header, and PT is stored in the packet header.
This indicates that S1 and DTS1 are stored. Further, it is shown that SCR2 is stored in the pack header of the final pack.

(B) shows a video object (VOB) which is the audio data system stream ST2. It is shown that in the head pack, SCR3 is stored in the pack header and PTS3 is stored in the packet header.

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

In the present invention, the final pack of the system stream ST1 forming the still image data so that the still image data system stream ST1 and the audio data system stream ST2 are processed by one system stream and the decoder. SCR2 and the SCR3 of the first pack of the system stream ST2 that composes the audio data are limited by setting a prescribed value by the following formula.

[0116]   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. Since the packs are simply distributed in the demultiplexer 52, Tp is the time required from the start of inputting one pack to the buffer 53 or 57 to the end of input.

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

As a result, the SCR2 is prevented from becoming a value larger than that of the SCR3, and the SCRs of the respective packs respectively constituting the still image data system stream and the audio data system stream are arranged in ascending order across the two system streams. Guaranteed to be distributed to.

Further, (Equation 1) guarantees that the difference between SCR2 and SCR3 is Tp or more. This avoids the occurrence of the transfer timing of the first pack of the audio data system stream during the transfer of the final 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.
It becomes 55296 (27 MHz). Also, 10.08M
When it is set to bps, it becomes 43885 (27 MHz).

Next, in the decoder of the present invention, when the MPEG stream forming the still image data is input to the decoder, after the input is completed, the next audio stream is input without resetting the STC. To be done.

This is because the decoder normally resets the STC for each system stream. Therefore, if the STC is reset after the still image data is input, 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 in this way, it is possible to handle still image data and audio data as one MPEG stream. That is, the separately recorded still image stream and audio stream can be reproduced as one system stream.

Further, PTS1 and PTS3 are set equal to each other with a predetermined value as shown below.

[0126]   PTS1 = PTS3 = predetermined value (Equation 2)

With this, it is possible to start outputting the voice and the still image at the same timing.

The predetermined value is, for example, 90,000 (90 kHz).
z) + Tv. Here, (90 kHz) indicates that the numerical value shown before is a 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 following equations (1) and (2) and about 1 second after reading (90000 (90 kHz))
The various time stamps in FIG. 11 will be specifically described by using the case where a still image and audio are simultaneously output to (+ Tv).

First, the time stamp of the VOB for still image 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 90,000 (90 kHz). The still image data VOB 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 93600 when 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 NTSC and 3600 when the video is PAL. Further, since the VOB for still image data includes only one still image, all packs are simultaneously output at the timing indicated by PTS1.

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

This reference value is determined in consideration of the fact that the maximum time from the input of the above-mentioned moving image data into the decoder buffer to the decoding thereof is 1 second (27000000 (27 MHz)).

That is, when the maximum storage time of the moving image data is adopted for the still image data as well, the VO for still image data is used.
All the packs that compose B are 1 second (27000000
It is necessary to complete the transfer to the decoder within (27 MHz). When the SCR (SCR1) of the first pack is 0, this pack is transferred to the decoder for 1 second (27,000).
000 (27MHz)), the SCR (SCR of the final pack that composes the same still image data
2) is 27000000 (27MH) as described above.
It is a value obtained by subtracting the transfer time (Tp) of one pack from z).

The above-described predetermined value of PTS and the meaning of defining this reference value are compatible with the encoder. That is,
The present invention is applied regardless of whether it is generated by any encoder as long as it is a still image system stream and an 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 is 1 second (27000000 (27 MHz)).
If the reference value is MaxT, the following equation holds.

[0139]         SCR2 + Tp ≤ MaxT (Formula 3)         SCR3 = MaxT (Equation 4)

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

(1) SCR of first audio pack (S
CR3) is 27000000 (27 MHz). This is a value that satisfies (Equation 1) and is input to the decoder in the shortest time consecutively to the VOB for still image data input in advance. Also, the PTS (PTS1) of the still image is 930
Since it is set to 03 (90 kHz), at least the SCR value needs to be smaller than this value in order to output the voice at the same time.

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

Of course, it is sufficient that the still image data VOB and the audio data VOB are encoded so as to satisfy the equations (1) and (2), and it is not always necessary to satisfy the above-mentioned condition values.

The video is NTSC and the initial value of SCR is not 0, but is 1 second, which is 27000000 (27 MH).
z) is as follows. SCR1 = 27000000 (= 1 second) SCR2 ≦ 539444704 (= SCR3-Tp) SCR3 = 54000000 (= SCR1 + 1 second) PTS1 = PTS3 = 183003 (= DTS1 + 30)
03) DTS1 = 18000 (= 1 second)

Further, in the case of NTSC, when the initial value of SCR is 0 and PTS is 1 second, 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 1 second, the following is obtained. SCR1 = 27000000 (= 1 second) SCR2 ≦ 539444704 (= SCR3-Tp) SCR3 = 54000000 (= SCR1 + 1 second) PTS1 = PTS3 = 183600 (= DTS1 + 36)
00) DTS1 = 18000 (= 1 second)

Further, in the case of PAL, when the initial value of SCR is 0 and the PTS is 1 second, the following is obtained. SCR1 = 0 SCR2 ≦ 25864704 (= SCR3-Tp) SCR3 = 2590000 (= 1 second-3600 × 30)
0) PTS1 = PTS3 = 90000 (= 1 second) DTS1 = 86400 (= PTS1-3600)

The transmission rate is 10.08 Mbps,
In case of NTSC, it 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)

The transmission rate is 10.08 Mbps,
In case of PAL, it is 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, the operation in which the MPEG stream having the time stamp set under the above-mentioned restrictions is processed by the decoder will be described with reference to FIGS. 19 and 20. Note that FIG. 5 is referred to for each configuration of the decoder.

Similar to FIG. 18 described above, FIG. 19 shows Phot.
It is a figure explaining operation | movement of the decoder of the still image camera of this invention, and the relationship of each time stamp, when o # 1 is reproduced.

FIGS. 19A and 19B show a state in which Still picture # 1 which is a still picture of Photo # 1 and Audio # 1 which is a sound are respectively output. 19 (c) and 19 (d) show Still
The transitions of the buffer occupancy of the audio decoder buffer 57 and the video decoder buffer 53 when picture # 1 and audio # 1 are respectively decoded and output are shown.
FIG. 19E shows pack arrangement and time stamps (SCR, PTS, DTS) stored in the pack when Photo # 1 is stored in the disc as stream # 1 and stream # 2 which are MPEG streams. .

Note that the illustration of the packet structure and the like are omitted as in FIG.

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

Stream # 1 as shown in FIG.
Has a configuration in which each pack is multiplexed from the top in the order of video pack V1, video pack V2, video pack V3, and video pack V4. Also, stream # 2 has a configuration in which audio pack A1 and audio pack A2 are multiplexed from the beginning. The point to be noted here is that stream # 1 is composed of only video packs, and stream # 2 is composed of only audio packs.

An SCR is stored in each pack. As shown in FIG. 19E, the time t1 is recorded in the SCR # 1 of the video pack V1 of the stream # 1 as the video pack V2.
At SCR # 2 of time t2 is SC of video pack V3
At R # 3, the time t3 is SCR # 4 of the video pack V4.
At time t4 is set as the SCR value. Also, a PTS value and a DTS value are set in the leading video pack.
At time T8 in PTS # 1 of video pack V1, 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, which is the same as the value in the above description. Also, the final video pack, video pack V4
Time t4 which is the SCR value of 27000000 (27
MHz) -Tp. As described above, Tp is the pack transfer time, which is 55296 (27 MHz). Further, the video data is of the NTSC system, and the time t8 that is the PTS value is 93003 (90 KHz), and the time t6 that is the DTS value is 90000 (90 KHz).

The time t7 is recorded in the SCR # 5 of the audio pack A1 of the stream # 2 as the SCR of the audio pack A2.
Time t9 is set as an SCR value in CR # 6. Audio pack A1 and audio pack A2 have P
The TS value is set. Audio Pack A1 PTS #
5, the time t8 is 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 leading 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 the stream # 1 is reset to the SC of each pack after the STC is reset at the time t1 which is the value of the SCR # 1 of the video pack V1 which is the first pack.
It is input to the demultiplexer 52 at the timing indicated by the R value.

That is, as shown in FIG. 19E, initially, the video pack V1 is demultiplexer 5 at time t1.
2 and then the video pack V2 at time t2,
Next, the video pack V3 is at time t3, and then the video pack V4 is at time t4.
Entered in.

Here, the difference from the decoding process of the still image camera described in FIG. 18 is that, next to stream # 1,
This is that the STC of the decoder is not reset and each pack forming stream # 2 is input to the demultiplexer 52 at the timing indicated by each SCR.

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, respectively.
It is input to the demultiplexer 52.

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

[0165]   SCR # 4 + Tp ≤ SCR # 5 (Equation 1)

Therefore, stream # 1 and stream #
The continuity of the SCR value between the two is guaranteed, and the interval is guaranteed to be at least the pack transfer time or more, so that the decoder does not hang up and the
One stream can be processed in succession.

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 description of the reproduction operation of the still image camera of the present invention, 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. 19 (c), each video pack output from the demultiplexer 52 has a delay that can be ignored, but at the timings of SCR timings of time t1, time t2, time t3, and time t4. It is stored in the video buffer 53. Still picture Still picture # 1 is composed of video packs V1 to V4. Therefore, if video pack V4 is accumulated in video buffer 53, still picture Stil
This means that all the data that makes up picture # 1 has been accumulated in the video buffer 53. As shown in FIG. 19E, the DTS value of the pictures forming the video packs V1, V2, V3, and V4 is time t6. Therefore, the accumulated data is stored in the video decoder 54 at the timing of 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 image data Stil.
l picture # 1. The decoded I picture is stored in the reorder buffer 55 and is the PTS value at time t8.
Is output to the outside at the timing of.

Next, as a third description of the reproduction operation of the still image camera of the present invention, the relationship between the operation of decoding and outputting the data of the audio pack 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 at time t7,
At the timing of time t9, the occupying amount of the audio buffer 57 is accumulated in the audio buffer 53 and increases. Unlike video data, audio data is PT
Since S and DTS are equal, the audio decoder 57 decodes the data of each pack and outputs the audio at the same time. That is, the data of the audio pack A1 accumulated in the audio buffer 57 is decoded by the audio decoder 57 at the timing of time t8, which is the PTS value, and audio output is started. Further, the data of the audio pack A2 accumulated in the audio buffer 57 at the timing of time t9 is the PTS value at time t10.
At the timing of, the audio is decoded by the audio decoder 57 and output as voice.

A point to be noted here is that the stream # 1 forming the still image data and the stream # 2 forming the audio data have the same PTS value. Therefore, stream # 1 and stream # 2 are input to the decoder separately, but since they have the same PTS value, they are output at the same time.

As described above, under the above-mentioned time stamp limit value, an MPEG stream consisting of only still picture data and an MPEG stream consisting of only audio data are continuously processed by the decoder, and at the same time, audio and video are simultaneously processed. You can see that you can display.

Since the still image and audio MPEG streams are separately recorded on the disc, it is easy to change the audio data that is output at the same time after the still image is captured.

For example, Still Picture # described in FIG.
It is assumed that 1 and Audio # 1 are the data recorded on the optical disc at the time of shooting. When it is desired to change the audio output at the same time as Still Picture # 1, it is sufficient to separately record an MPEG stream having a time stamp that satisfies (Equation 1) and (Equation 2) as in the MPEG stream that is Audio # 1. Audio # 2
FIG. 20 shows an example in which is additionally recorded as MPEG stream # 3.

Although not shown, management information indicating an MPEG stream for audio data which is reproduced at the same time as the MPEG stream which is Still Picture # 1 is recorded on the disc. By updating this management information, the MPEG stream which is Audio # 2 instead of Audio # 1 is reproduced at the same time as the MPEG stream which is Still Picture # 1.

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

In recent years, the densities of rewritable optical discs have increased, and it has become possible to record not only computer data and audio data but also image data.
For example, on the signal recording surface of an optical disc, a guide groove having an uneven shape has been conventionally formed.

Conventionally, the signal was recorded only on the convex or the concave, but it becomes possible to record the signal on both the convex and the concave by the land group recording method. As a result, the recording density has been improved about twice.

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

A major issue for the future is how to record AV data including image data by using these optical disks aiming at large capacity, and to realize performance and new functions that greatly exceed conventional AV equipment.

With the advent of such a large-capacity rewritable optical disc, it is conceivable that the optical disc will be the main component for AV recording / reproduction instead of the conventional tape. The transfer of recording media from tapes to disks has various effects on the functions and performances of AV equipment.

The greatest feature of the shift to the disk is a significant improvement in random access performance. If the tape is randomly accessed, it usually takes several minutes to rewind one roll. This is orders of magnitude slower than the seek time (several 10 ms or less) in the optical disc medium. Therefore, the tape cannot practically be a random access device.

With such random access performance, distributed recording of AV data, which was impossible with conventional tapes, has become possible with optical discs.

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

In the recording area of the optical disc, 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 on the innermost circumference, then a data area, and a lead-out area on the outermost circumference. Each sector has an address part and a data part. The address portion stores address information for specifying the position of the sector on the optical disc and identification information indicating which area the sector belongs to. Digital data is stored in the data portion of each sector.

In the data part of the sector of the lead-in area,
Information for initializing the playback device is stored. Typically, a standard signal necessary for stabilizing the servo, an identification signal with other media, etc. are recorded.

In the data portion of the sector of the data area, digital data which constitutes an application stored on the disc is recorded.

The lead-out area is an area indicating the end of the recording area to the reproducing device.

At the top of the data area, management information called a volume information which constitutes a file system is recorded. The file system is table of contents information for grouping and managing a plurality of sectors on the disk. A plurality of sectors are grouped as a file and a plurality of files are grouped as a directory for management. In the embodiment of the present invention, the file system defined by ISO13346 is used.

In this embodiment, the optical disc is the same as that shown in FIG.
It has the directory / file structure shown in FIG.

All the data handled by the DVD recorder is the VID directly under the ROOT directory as shown in FIG. 8 (a).
It is placed under the EO_RT directory.

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

The management information file is roughly divided into V
It is divided into an OB table and a PGC table. VOB
(Video Object) is an MPEG program stream, and PGC (Program Cha).
(in) defines a cell reproduction order in which an arbitrary partial section (or entire section) in the VOB is one logical reproduction unit. In other words, VOB is one unit that has meaning as MPEG, and PGC is one unit that the player reproduces.

The VOB table contains the number of VOBs (Num
(ver_of_VOBs) and each VOB information is recorded,
The VOB information is the corresponding AV file name (AV_File
_Name), VOB identifier in the disc (VOB_
ID), start address in AV file (VOB
_Start_Address), end address (VOB_End_Address) in the AV file, V
OB playing 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 each PGC information are recorded,
The PGC information is the number of cells in the PGC (Number_o
f_Cells) and each cell information, and Ce
The ll information is the corresponding VOB_ID, the playback start time (Cell_Start_Time) in the VOB, and the playback time (Cell_Playback_Tim) in the VOB.
e), the playback start address in the VOB (Cell_St
art_Address), a reproduction end address (Cell_End_Address) in the VOB, an audio flag (Audio_Flag) indicating the presence of audio data to be reproduced at the same time when a still image is used, and a VOB_ID and Cell_Start_Tim extended for audio.
e, Cell_Playback_Time, Cell
_Start_Address, Cell_End_A
It is composed of ddress.

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 a still image.

(AV File) Next, an AV file will be described with reference to FIG. The AV file is composed of a plurality of (at least one) VOBs, the VOBs are continuously recorded on the disc, and further, the VOBs belonging to the same AV file are continuously arranged on the disc. The VOB in the AV file is managed by the VOB information of the management information file described above. The player can access the VOB by first accessing the management information file and reading the start address and end address of the VOB. Moreover, Cell is defined as a logical reproduction unit in the VOB. Cell is a partial reproduction section (or entire section) of the VOB and can be freely set by the user. With this Cell, the actual AV
It is possible to perform simple editing without operating the data. As with 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 and end addresses of the cell.

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

(Link of Still Image Data and Audio Data) Next, a mechanism for performing synchronous reproduction of a still image and audio will be described with reference to FIG.

FIG. 10A shows a part of the above-mentioned management information file. As shown in FIG. 10A, the cell for a still image is the access information (VOB_ID, C) to the VOB for still image data and audio data, respectively.
ell_Start_Time, Cell_Playb
ack_Time, Cell_Start_Addre
ss, Cell_End_Address).

The audio flag indicates whether or not audio data to be reproduced together with still image data exists. For this reason, when the audio flag is set to 1, it indicates that there is audio data to be output together with the still image data, and V for audio data is used.
It means that the access information of OB exists in Cell. If 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, still image data and audio data can be associated with each other.

FIG. 10B shows an AV file for still image data / audio data. There are multiple V files in the AV file for still image data / audio data.
Although the OB is 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. Unlike the VOB for moving image data, the VOB for still image data is composed of only one I-picture compressed video frame, and the VOB for audio data is composed entirely of audio data. Such still image data VOB and audio data VOB are respectively C
The reproduction control information of the still image and the audio data is configured by referring to the cell information and further 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 Cell to be referred to for the separately recorded still image data and audio data.

In the present embodiment, it has been described that one MPEG stream VOB includes a video data VOB and an audio data VOB. 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 portion (Video Part) is stored in the head portion of the VOB, and subsequently the audio data portion (Audio Part) is stored. FIG. 10C shows the RTR_ST shown in FIG. 8B.
O. An example of a VRO file is shown. The first system stream ST1 shown in FIG. 11 and the still image data portion (Video Part) shown in FIG. 10C have the same concept, and both are called video part streams. Similarly, the second system stream ST2 shown in FIG. 11 and FIG.
Audio part shown in 0 (c)
Have the same concept, and both are called audio part streams.

The file structure may be that shown in FIG. 8B. In this case, the VIDEO_RT directory corresponds to the DVD_RTR directory,
RTR.IFO and RTR_ directly under the RTR directory
STO.VRO, RTR_STA.VRO, RTR_MO
V. It is composed of VRO files. RTR.IFO is a file corresponding to the management information file, and RTR_
STO. VRO and RTR_STA. VRO is a file recorded in relation to still image data. RTR_S
TO. VRO is still image data (Video Part) and audio data (Audi
o Part) is recorded. RTR_STA. The VRO records only the audio data (Audio Part) edited after recording, and RTR_STA. The audio data of VRO is RTR_STO. It is recorded in association with the still image data recorded in the VRO. The moving image data is separated from the still image data by RTR_MOV. It is recorded in the 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 (27MHz) -Tp SCR3 = 27000000 (27MHz) Tp = 55296 (27MHz) 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, 11 is an optical pickup for reading data from the disc, and 12 is an ECC (error c).
is a track buffer, 14 is a switch for switching input and output to the track buffer, 15 is an encoder section, 16 is a decoder section, and 17 is an enlarged view of a disk.

As shown in 17, data is recorded on the DVD-RAM disc with 1 sector = 2 KB as the minimum unit. Also, with 16 sectors = 1 ECC block,
The ECC processing unit 12 performs error correction processing.

Reference numeral 13 is a track buffer. By using the track buffer 13, AV data discretely arranged on the disc can be supplied to the decoder without interruption. This will be described with reference to FIG.

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

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

In other words, if the data amount ([a1, a2]) to be read out before seek is secured at a certain amount or more, 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 successively processed by the decoder are not necessarily arranged continuously on the disc. As shown in FIG. 20, a stream for still image data #
The audio data streams that can be continuously processed by the decoder as 1 are 2 of stream # 2 and stream # 3.
Exist. For this reason, only one of them can be placed on the disk consecutively with stream # 1, and the other is
The stream # 1 is arranged in an area on the disc which is discontinuous.

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

An example of reading data from the DVD-RAM, that is, reproduction has been described.
The same can be applied to the case of writing data to, that is, recording.

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

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

In the figure, reference numeral 1201 is a user interface section for receiving display to the user and requests from the user, 1202 is a system control section for overall management and control, 1203 is an input section consisting of a camera and a microphone, and 1204 is An encoder unit including a video encoder, an audio encoder and a system encoder, 1205 an output unit including a monitor and a speaker, 1206 a decoder unit including a system decoder, an audio decoder and a video decoder,
1207 is a track buffer and 1208 is a drive.

With respect to the DVD recorder configured as described above, the flowcharts shown in FIG. 13, FIG. 14 and FIG.
The recording operation in the DVD recorder will be described with reference to FIG.

The user interface unit 1201 first receives a request from the user. The user interface unit 1201 receives a request from the user, and the system control unit 1201.
2, the system control unit 1202 interprets the request from the user and makes a processing request to each module. When 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 audio.

The encoder unit 1204 video-encodes and system-encodes only one video frame sent from the input unit 1203, and outputs V 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, SCR is reset to 0, PTS value and 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
Initialize to 0 (90 kHz) and set.

If still image data has not been recorded, the encoder unit 1204 converts the still image data into a packed packet structure. (S1404) If converted to the packed packet structure, the encoder unit 1
Reference numeral 204 calculates the SCR / DTS / PTS time stamps and adds the time stamps to the still image data converted into the pack / packet structure. (S1405) At this time, the initialization value 0 is set as the SCR value in the first pack. Also,
9300 which is the above initialization value as the PTS value and the DTS value
3 (90 kHz) and 90000 (90 kHz) are set. If the pack is the final pack, the SCR is 27
Transfer time from 1,000,000 (27MHz) to 1 pack (T
The time stamp is forcibly added so as to satisfy a time earlier than the time when p) is subtracted.

The encoder unit 1204 judges whether or not the still image data has been recorded (S1402).
The system control unit 1202 is notified that the still image data VOB has been created, and the system control unit 1202 sends the still image data VOB stored in the track buffer 1207 through the drive 1208 to the DVD-RAM.
Record to disc. (S1403) In the present embodiment, the VOB for still image of all data is generated and then recorded, but it may be sequentially recorded in parallel with the generation.

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

Specifically, as shown in FIG. 15, the encoder section 1204 sets the SCR value to 27000000 (27M).
Hz), and the PTS value is initialized to 93003 (90 kHz). In addition, when the still image data reproduced simultaneously is PAL, it is set to 93600 (90 kHz). (S1
501) If the audio data has not been recorded, the encoder unit 1204 converts the audio data into a pack / packet structure (S1504), calculates the SCR / PTS time stamp, and adds it. (S1505) At this time, the SCR value of the first pack is 27000000 (27
MHz) and the PTS value is 93003 (90 kHz)
become.

The encoder section 1204 judges whether the audio data has been recorded (S1502).
02 is the track buffer 12 through the drive 1208
DV the audio data VOB stored in 07
Record on D-RAM disc. (S1503) In this embodiment, the VOB for audio data 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 transmitted through the user interface unit 1201 to the system control unit 120.
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.
DVD-RA for all remaining VOBs stored in 07
Record on M disc.

After completion of the series of operations, the system control unit 120
2 creates the management information file shown in FIG. 9A including the VOB table and PGC table described above, and records it on the DVD-RAM disk through the drive 1208. (S1304) If 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 there is no audio data recorded. (S1307) Furthermore, the Cell playback time (Cell_Playback_Ti) for still image data and audio data is added.
management information is set so that both (me) and audio reproduction time are matched.

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 default value by the recording method described above.

Next, FIG. 12 and FIG. 1 which is a flowchart.
The reproducing apparatus in the DVD recorder will be described with reference to FIG.

The user interface unit 1201 first receives a request from the user. The user interface unit 1201 receives a request from the user, and the system control unit 1201.
2, the system control unit 1202 interprets the request from the user and makes a processing request to each module. When the request from the user is reproduction of the disc, the system control unit 1202 reads the PGC table indicating the reproduction order from the management information file through the drive 1208.

The system controller 1202 reads the 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 cell reproduction order. Each cell is VOB_
It has information on the start address and end address of the ID and VOB, and it becomes possible to access the VOB for still image data by these information. (S1601)

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

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

Since the cell address information is based on the VOB and the VOB address information is based on the AV file, in reality, the VOB address information is added to the cell address information to obtain the address information in the AV file. The player calculates the AV recorded on the DVD-RAM.
Data can be read. (S1604)

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

The processing by the continuous decoder of the still image data VOB and the audio data VOB when the audio flag is 1 is specifically performed as follows.

That is, the system control unit 1202 determines the VOB for still image data first by the track buffer 1207.
When the audio flag is 1, the decoder unit 1206 is requested to decode the still image data VOB by using the time when the audio data VOB is read into the track buffer 1207. The audio data VOB is read out immediately after the decoder unit 1206 is started.
Request to decode. The decoder unit 1206 reads the MPEG stream stored in the track buffer 1207 and supplies the decoded data to the output unit 1205. The output unit 1205 outputs the sent data to the monitor and the speaker at the specified reproduction time.

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

At this time, what is important is that the still image data VOB and the audio data VOB are the above-mentioned "still image data VOB and audio data VOB".
By adopting the configuration of
Means that it can be processed as one VOB composed of one still image data and audio data.

In this embodiment, the DVD-RAM is used.
Although the same is true for other media, the present invention is not limited to DVD-RAM and optical discs.

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

Further, in the present embodiment, the link information of the still image data and the audio data is provided in Cell unit, but one VOB is made into one Cell and VO
It may be provided in B units.

Further, in the present embodiment, the Cell reproduction time (Cell_Playback_Time) information is the same between still image data and audio data, but it does not necessarily have to have the same value. For example, information for audio data is given priority. Cell playback time (Cell_Playback)
When the k_Time) information is read, the behavior for the still image data may be ignored.

In this embodiment, the still image data VOB and the audio data VOB are replaced with other VOBs.
Although it is separately recorded in the AV file, it may be recorded in the same AV file as another VOB, and the present invention is not limited to the structure of the AV file.

[0253]

According to the present invention, at least still image data and audio data are packed and have an MPEG structure.
In the optical discs that are independently recorded as separate streams in different areas, the input start time (SCR2) of the last pack of the still image data into the decoder buffer and the input start time (SCR2) of the first pack of the audio data into the decoder buffer ( SCR3) is recorded so that the following equation is established using the time (Tp) required to transfer one pack.

SCR2 + Tp ≤ SCR3

As a result, the decoder can process still image data and audio data recorded independently as if they were one MPEG stream.

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

The data display start time (PTS1)
By recording the display start time (PTS3) of the audio data as the same value, it is possible to reproduce the still image data and the audio data synchronously (start display at the same time).

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

Further, by having an identification flag (Audio_Flag) indicating the presence of audio data reproduced in synchronization in the management information of the still image data, the optical disc player can identify the presence or absence of audio data, and the still image The effect that the data and the audio data can be synchronously reproduced is obtained.

[Brief description of 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 disc and a data storage amount in a track buffer.

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

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

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

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

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

FIG. 8A is a diagram showing a directory structure. (B) is a diagram showing a physical layout on the disk

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

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

FIG. 11A is a diagram showing a VOB for still image data. FIG. 3B is a diagram showing a VOB for audio data. (C) is a diagram showing a synthetic VOB

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

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

FIG. 14: VOB for still image data of DVD recorder
Flowchart of processing for

FIG. 15: VO for audio data of DVD recorder
Flowchart diagram of processing for B

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

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

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

FIG. 19 is an explanatory diagram showing an operation of reproducing a still image accompanied by audio according to the present invention.

FIG. 20 is an explanatory diagram showing a modified example of the operation of reproducing a still image accompanied by audio according to the present invention.

[Explanation of symbols]

11 Optical pickup 12 ECC processing unit 13 track buffer 14 switch 15 Encoder part 16 Decoder part 41 pack header 42 packet header 43 Payload 51 STC 52 Demultiplexer 53 video buffers 54 video decoder 55 reorder buffer 56 switch 57 audio buffers 58 audio decoder 1201 user interface section 1202 System control unit 1203 Input section 1204 Encoder part 1205 Output section 1206 Decoder part 1207 track buffer 1208 drive

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-8-7475 (JP, A) JP-A-8-107541 (JP, A) JP-A-9-97490 (JP, A) JP-A-11- 346342 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5 / 85,5 / 91-5/956 H04N 7/24 G11B 20/10

Claims (17)

(57) [Claims] 1. An optical disc which can be reproduced by a reproducing device comprising a decoder buffer (53, 57), a decoder (54, 58) and an output section (55, 56), and one or more discs on the disc. An optical disc recording device for recording a system stream including management information for managing a recording area as a file, still image data, and audio data reproduced together with the still image data, the optical disc recording device comprising an encoder (1204). ) And a system control unit (1202), and the encoder (1204) is composed of a plurality of units including still image data of one picture and is recorded as a part of a file. ST1) and one or a plurality of audio data that are reproduced together with the still image data. And an audio part stream (ST2) that is recorded as a part of a file, and the encoder (1204) provides the unit with time stamp information indicating the time required for decoding processing and data output. The time stamp information stores the last unit of the video part stream in the decoder buffer (5
3) and the time SCR3 at which the first unit of the audio stream is input to the decoder buffer (57) are included, and between these times SCR2 and SCR3, the following equation: SCR2 + Tp ≤ SCR3 However, Tp represents the time required from the start of inputting one unit to the decoder buffer until the end of inputting, and the above units of the video part stream are continuously arranged in the above file. Out,
An optical disk recording device, wherein the above units of an audio part stream are also arranged consecutively in the above file. 2. The encoder further comprises, as the time stamp information, a time SCR1 when 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 section (55, 55). 56) and the time PTS1 output from the above, and regarding these times SCR1, SCR2, and PTS1, the following equation SCR1 = 0 SCR2 ≦ 27000000 / (27 MHz) −Tp PTS1 = 900000 / (90 KHz) + Tv , 27MHz clock count value (90KHz) is 90K
It shows that it is the count value of the clock of Hz, Tp
The optical disc recording apparatus according to claim 1, wherein is a time required to transfer the last unit of the video part stream, and Tv is a frame period of video data. 3. 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 expression SCR3 = 27000000 / ( 27 MHz) PTS3 = 90000 / (90 KHz) + Tv holds, The optical disk recording apparatus according to claim 2. 4. The system control unit generates management information of video and audio part streams, and indicates presence of audio data reproduced in synchronization with the still image data in the management information of the video part streams. The optical disc recording apparatus according to claim 1, wherein an identification flag (Audio_Flag) is stored. 5. The optical disc recording apparatus according to claim 1, wherein the system control unit records a reproduction time (Cell_Playback_Time) of the audio data in the management information of the audio part stream. 6. Still image data and the still image data are recorded on an optical disk which can be reproduced by a reproducing device having a decoder buffer (53, 57), a decoder (54, 58) and an output section (55, 56). An optical disc recording method for recording a system stream including audio data to be reproduced together, the optical disc recording method recording management information for managing one or more recording areas on the disc as a file. , A video part stream (ST1) composed of a plurality of units including still image data of one picture,
Recording as part of a file, recording an audio part stream (ST2) composed of one or more units containing audio data reproduced with the still image data as part of the file, A time stamp information recording step of recording time stamp information indicating a time required for decoding processing and output in the unit, and as the time stamp information, the last unit of the video part stream is the decoder buffer (53). ) And a time SCR3 at which the first unit of the audio part stream is input to the decoder buffer (57). Between these times SCR2 and SCR3, the following equation: SCR2 + Tp = SCR3 only , Tp is from one unit is started input to the decoder buffer, shows the time required to input ends, the holds, the unit of the video part stream are aligned in succession the file,
An optical disc recording method, wherein the above units of an audio part stream are also arranged consecutively in the above file. 7. 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 from the output section (55, 56). The following equation SCR1 = 0 SCR2 = 27000000 / (27MHz) -Tp PTS1 = 90000 / (90KHz) + Tv including the time PTS1 It shows that it is a count value, and (90KHz) is 90K.
It shows that it is the count value of the clock of Hz, Tp
7. The optical disc recording method according to claim 6, wherein is a time required to transfer the last unit of the video part stream, and Tv is a frame period of video data. 8. The time stamp information further includes a time PTS3 when the audio part stream is output from the decoder (58). For these times SCR3 and PTS3, the following equation SCR3 = 27000000 / (27 MHz) PTS3 = 900000. 8. The optical disc recording method according to claim 7, wherein / (90 KHz) + Tv is satisfied. 9. A management information recording step of recording management information of a video and audio part stream, wherein the management information of the video part stream includes audio data reproduced in synchronization with the still image data. 7. The optical disc recording method according to claim 6, wherein an identification flag (Audio_Flag) indicating the above is generated. 10. The reproduction time (Cel) of the audio data is further included in the management information of the audio part stream.
7. The optical disc recording method according to claim 6, further comprising storing l_Playback_Time). 11. An optical disc reproducible by a reproducing apparatus comprising a decoder buffer (53, 57), a decoder (54, 58), and an output section (55, 56), the optical disc being a disc. A video part stream (ST1) composed of management information for managing one or more recording areas above as a file and a plurality of units including still image data of one picture and recorded as part of the file (ST1) And an audio part stream (ST2) composed of one or a plurality of units including audio data reproduced together with the still image data and recorded as a part of a file. The time stamp information indicating the time required for data output is stored. The last unit of the video part stream into the decoder buffer (5
3) The time SCR2 to be input and the time SCR3 to which the first unit of the audio part stream is input to the decoder buffer (57) are included. Between these times SCR2 and SCR3, the following equation: SCR2 + Tp ≤ SCR3 However, Tp is the time required from the start of input of one unit of the video part stream (ST1) to the decoder buffer until the end of input, and the above unit of the video part stream is set to the above file. An optical disc characterized in that the units of the audio part stream are also consecutively arranged in the file. 12. 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 equation SCR1 = 0 SCR2 + Tp ≦ 27000000. / (27MHz)
= 1 sec. However, the optical disc according to claim 11, wherein (27 MHz) is a count value of a 27 MHz clock. 13. Regarding the time SCR3, the following expression SCR3 = 27000000 / (27 MHz) = 1
sec. 13. The optical disk according to claim 12, wherein: 14. The time stamp information further includes the video part stream in the output unit (55, 56).
12. The time PTS1 output from the PTS1 and the time PTS3 output from the decoder (58) of the audio part stream are included, and the times PTS1 and PTS3 have the same value. optical disk. 15. The time stamp information further includes a decoding start time DTS1 at which the video part stream is decoded by the decoder (53), and the time DTS1 is expressed by the following equation: DTS1 = 900000 / (90 kHz) = 1 sec. However, the optical disc according to claim 11, wherein (90 kHz) is a count value of a clock of 90 kHz. 16. The times PTS1 and PTS3 are expressed by the following expressions PTS1 = PTS3 = 900000 / (90 kHz).
z) + Tv, where (90 kHz) indicates a count value of a clock of 90 kHz, and Tv indicates a frame period of video data. 17. The optical disc further includes management information (Volume informati on) for video and audio part streams.
on) is recorded, and an identification flag (Audio_Fl) indicating the presence of audio data reproduced in synchronization with the still image data in the management information of the video part stream is recorded.
An optical disc according to claim 11, characterized in that it contains ag).