JPH07284065A - Reproducing method for audio information and moving picture information - Google Patents

Abstract

PURPOSE:To reproduce audio and video information from the specific part of a sequence (music) by using the access point information of a partial sequence recorded on the required track of a video CD. CONSTITUTION:The respective sequences composed of moving picture information and audio information for the respective music are recorded in the video CD 1 and the access point information of the partial sequences for the respective sequences is recorded on the first track of the CD 1. When the access point information is used, the position of the desired specific part of the sequence is detected and the audio and moving picture video information from the desired part of the sequence is easily and surely outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reproduces the audio information and the moving image information from a recording medium in which the audio information and the moving image information are recorded, such as a karaoke moving image CD (compact disc). Regarding the method.

[0002]

2. Description of the Related Art One of the standards of CD-ROM is called a video CD. On this video CD, moving image information is recorded together with audio information, which has been put to practical use for so-called karaoke.

In this video CD, MPEG (Movin
According to the g Picture Expert Group) 1 standard, a moving image signal and an audio signal are compression-coded and recorded.

That is, the audio signal is made into a digital signal, and is compressed and recorded by the compression coding method utilizing the psychoacoustic characteristics. In addition, the moving image signal is converted into a digital signal, one screen is divided into blocks, and a discrete cosine transform (DCT) is performed for each block to reduce the code amount according to the degree of change of the image.
According to (Variable Length Code), a code having a higher appearance frequency is recorded so that a shorter code is assigned to reduce the code amount as a whole.

In the case of moving image data, the difference between the predicted change screen and the actual screen is extracted from the past and future screens, and this difference and the predicted change amount are recorded. , The amount of data is compressed. However, since a demodulated image cannot be obtained only with the difference data and the predicted change amount, the data of the image of one screen (one frame) that is the reference thereof is directly compressed and encoded without referring to other images. Record. In this way, the reference image compressed and encoded without referring to other images is I
Called a picture. Other images that can be said to be change information for this I picture are called P picture and B picture.

Audio signals and moving image signals are recorded on the disk in units of sectors of the CD-ROM standard as shown in FIG. That is, in FIG.
Is a sector of compression-encoded moving image data (hereinafter referred to as a video sector), and A is a sector of compression-encoded audio data (hereinafter referred to as an audio sector).
Since the audio data has a smaller data amount than the moving image data, it is recorded at a ratio of one audio sector to a plurality of video sectors as shown in FIG.

As will be described in detail later, each sector has information for distinguishing whether it is an audio sector or a video sector,
Information of absolute time on the disc, information of time when a moving image or sound is output during reproduction (corresponding information of reproduction timing of moving image and sound) is recorded, and based on these information,
In the playback device, each song and the moving image associated with it are played back.

By the way, as is clear from the above description of the compression coding method for moving image data, if an I picture is missing, a correct demodulated image cannot be obtained. Therefore, a certain track (one track corresponds to one song; a series of events such as one song is called one sequence. The same applies hereinafter).
It is difficult to obtain a correct reproduced image when reproducing from the middle of the process unless the position of the I picture is known.

In the video CD format, one I-picture is specified to be recorded within two seconds in order to maintain a predetermined image quality.
In 0 (Ver.1.0), information about the position of the I picture is not recorded on the disc. For this reason, in version 1.0, it was not easy to reproduce from a certain track.

Video CD format version 1.
1 (Ver.1.1), in the area for recording information about the number of songs on the disc and the recorded data on the disc (first track 1 as described later), a position where the image can be played in the middle of the track (entry point and (Named) is recorded as time information. This entry point is information on the position of the I picture, and by performing reproduction with reference to this point, image reproduction is possible even during partial reproduction or fast-forward reproduction.

[0011]

By the way, although a CD moving image karaoke system conforming to the above-mentioned version 1.0 of the video CD format has been realized, the number of song programs as TV programs has decreased, so It is difficult to remember, the so-called karaoke box has appeared, and the usage fee has changed from song-based system to hourly system. Due to changes in the environment surrounding the karaoke market, the following requirements for karaoke CDs Are coming out of the market.

That is, it is desired to sing only the characteristic part of a song called a chorus in the song. I want to sing only No. 1 or No. 2 of the songs, or want to round up the No. 2 song. I would like to skip the parts that are not related to singing, such as the interlude in the song, and the clauses (phrases) that I am not good at by fast-forwarding. And so on.

However, in the conventional case, since there is no way for the reproducing apparatus to know the position of the specific partial sequence as described above, the user searches for the start and end points of the partial sequence and performs the specific partial reproduction or It is necessary to operate the playback device to realize the omission, which is troublesome. In particular, when limiting the position of a partial sequence that depends on the song, such as when playing only the chorus part, it is necessary to operate not only at the start position of the partial sequence but also at the position where the partial sequence ends. And the operation is cumbersome.

Further, as described above, in the version 1.0 of the video CD format, since the information regarding the position of the I picture is not recorded on the disc, the reproduction is performed from the middle of a certain song as described above. When doing, it was difficult to reproduce the moving image related to it.

Video CD format version 1.
With No. 1, since the position of the I picture can be known as the entry point, the moving image can be played even from the middle. However, when the playback is started from a specific part of the music, as in the cases 1 to 3, It is not possible to specify whether it is preferable to start playback from the entry point.

As described above, according to the present invention, even if the reproduction from a part (partial sequence) in the middle of one music (sequence) or the omission of a part thereof is performed, the partial reproduction and omission can be easily performed. It is an object of the present invention to provide a reproducing method that enables a moving image to be correctly reproduced from the point of resuming reproduction after omitting the partial reproduction.

[0017]

In order to solve the above-mentioned problems, a reproducing method of audio information and moving picture information according to the invention of claim 1 records audio information of one or a plurality of sequences, and As for the related moving image information, for images at appropriate intervals, all of the image information of one frame is compressed and recorded, and for images other than the above-mentioned image, change information of image information of preceding and following frames is displayed. A reproducing method of reproducing the audio information and the moving image information from a recording medium that is compressed and further records information of an access point of a partial sequence in one sequence in a predetermined recording area,
When starting reproduction from the access point of the partial sequence, the moving image information detects the recording position of the image data recorded by compressing all the image information of the one frame that is a predetermined time before the access point. The decoding process of the moving image data is started from the detected recording position, and the reproduction signal of the audio information and the moving image information is output from the access point.

In the reproducing method of audio information and video information according to the second aspect of the present invention, when reproduction is started from the access point of the partial sequence, the audio information outputs a reproduction signal from the access point and a moving image. As for the image information, the recording position of the image data in which all the image information of the one frame after the access point is compressed and recorded is detected, the decoding process of the moving image data is started from the detected position, and the moving image is recorded. A reproduction signal of image information is output. Further, in the reproducing method of audio information and video information according to the invention of claim 3, a part in one sequence is recorded in the predetermined recording area. Sequence access point information and the above 1 in the vicinity of this access point
A reproduction method for reproducing the audio information and the moving image information from a recording medium on which information indicating an image position where all the image information of a frame is compressed and recorded is recorded, which is an access point of the partial sequence. When the reproduction is started from the above, decoding of the moving image information is started from the image position designated by the information indicating the image position where all the image information of the one frame is compressed and recorded. And

[0019]

In the reproducing method according to the first aspect of the present invention having the above-described structure, the reproduction is performed using the information of the access point of the partial sequence in one sequence recorded in the defined recording area on the recording medium. At this time, the position of the I picture in the case of the above-mentioned video CD at the time point before the access point in time is detected, and the moving image data decompression decoding process is started from this I picture position.
When it becomes an access point, it outputs a decompression output signal of moving image data.

In the reproducing method of the second aspect of the invention, the extension decoding of the audio signal and the outputting of the reproduction signal are performed from the access point, but the extension decoding of the moving image data is performed by the I picture after this access point. Starting from the position, the reproduction signal of the moving image data is output from that point.

Further, in the reproducing method of the third aspect of the invention, the recording medium, together with the information of the access point,
Information about the position of the I picture near the access point is recorded. Therefore, the moving image data is decoded from the I picture position indicated by this information. When the I-picture position is before the access point, the playback signal of the moving image data is output from the access point, and when the I-picture position is after the access point, the decoded moving image is displayed. Immediately output the reproduction signal of the image data.

As described above, according to the present invention,
By using the access points of the partial sequences recorded on the recording medium, playback from the access point, omission, etc. can be realized, and at the time of playback from the access point, moving image data is always output from the I picture near the access point. Since the decoding is performed, it is possible to always correctly reproduce the moving image even when the reproduction is performed from the middle of one sequence.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the reproducing method according to the present invention will be described below by taking the above-mentioned video CD as an example.

Before explaining the embodiment of the reproducing method according to the present invention, the format of the video CD will be explained.
FIG. 2 is a diagram for explaining the recording format on the video CD. That is, as shown in FIG. 2, the video CD has a lead-in track at the head, as shown in FIG. 2, and has N (N ≦ 99) data tracks 1 to N and a lead-out track. Followed by trucks. And
The compressed audio information and the compressed moving image information are recorded on the second to second tracks 2 to N among the tracks 1 to N. Each of the tracks 2 to N corresponds to one song (one sequence), and N-1 songs can be recorded on the video CD.

Also, on the first track 1, the video C
Various information and data relating to the contents of D are recorded, and it is also described in this track 1 that the video CD is in the karaoke format.

Further, as shown in FIG. 2, the track 1 is provided with a karaoke basic information area, a video CD information area and the like. In the karaoke basic information area, basic information about karaoke on the disc in each language according to the country in which the disc is used, KARINFO. J
P (for Japan), KARINFO. US (for the United States), etc. are included, and the number of pieces of basic information for each country and the number of songs on the disc are described in KARINFO. B
IH is included.

As basic information about karaoke prepared for each country, a karaoke data table for n = (N-1) songs is recorded. This data table is called a "sequence item table" and is independently configured for each song. That is, n = (N-1) sequence item items corresponding to each karaoke song.
Tables SIT1 to SITn are provided. In addition to the table for each song, a data table S related to the video CD called a disc item table.
IT0 is provided. In the disc item table SIT0, a disc title, the total number of songs, a disc catalog number, etc. are recorded.

Sequence item table SITi
(I = 1 to (N-1)) has 64 item columns.
The item includes an essential item and an optional item, but the length of the content in each item column is variable. Therefore, the sequence item table SIT
Information GL indicating the length of the table is provided at the beginning of i. The data of each item is called an item packet, and each item packet has an item number (item number) INo. And the item length information IL,
It consists of the content ID (text data) of the item.

FIG. 3 shows the structure of the table SITi. For example, the item number 9 is used as an item field of a song name, and the content thereof is data indicating the song name as text data. Alternatively, the item number 18 is a lyrics item column, and the lyrics are stored in the form of text data.
Further, the item columns of item numbers 22 to 31 are open to the maker and can be freely defined and used by the maker.

In the version 1.0 of the video CD, the position of the I picture in the compressed moving image data is not prepared as information as described above, but in the version 1.1, the first track is the first track. In the video CD information area No. 1, there is an entry table in which the recording position of a predetermined I-picture is used as an entry point and this is represented by time information on the disc so that it can be used for fast-forward reproduction and reproduction from the middle. It is provided. The entry table is provided for each track, and up to 98 entry points are sequentially recorded per track (one sequence). The time information from the beginning of each track is used as the entry point time information.

The data structure of the video sector and audio sector is shown in FIG. As shown in FIG. 4, one sector has a structure in which a header and a subheader are added in front of a data group called a pack of 2324 bytes. In the header, information on the absolute time from the innermost circumference to the sector is recorded in minutes, seconds and frames. Also, the sub-header includes sub-mode information, and from this sub-mode information, whether the sector is a video sector,
Can be recognized as an audio sector.

The contents of the pack are slightly different between the video sector and the audio sector. That is, a pack header common to the video sector and the audio sector is provided at the beginning of the pack. The "pack start" in the pack header is data indicating that the pack starts from that position, and is "SCR (System Code Reference)".
Is data indicating the time to read the pack data,
The "MUX rate" indicates the transfer rate of video compression data and audio compression data.

The contents of the packet header in the packet portion excluding the pack header in the pack data differ between the video sector and the audio sector. "Packet start" in the packet header is data indicating that the packet starts from that position, and "ID" indicates whether the packet is a video packet or an audio packet. The “packet length” indicates the length of packet data, and is the “buffer size”.
Is information indicating a buffer size required for decoding.

In addition, "PTS (Present Time Stamps
) ”Indicates the time when the playback device outputs a moving image or sound. The playback device refers to the PTS to recognize which image is to be output at the output timing of a certain sound.

The packet header is common to the video sector and the audio sector up to the "PTS", and the compressed audio data is recorded after the "PTS" in the audio sector. On the other hand, in the case of the video sector, "DTS (Decode Time Stamp) is described after" PTS "and the time to send data to the decoder is further described.
) ”Is provided, after which compressed video data is recorded.

Next, an embodiment of the reproducing method of the present invention will be described.

[For Video CD Standard Version 1.0] In this example, as described above, no entry point information is recorded on the video CD.
However, in this example, in the video CD, items of item numbers 22 to 31 in the sequence item table of the karaoke basic information area of the first track 1 which can be freely defined and used by the manufacturer. The information of the access point of the partial sequence is recorded in the column. The access point information of these partial sequences is recorded as time information from the head position of each track. The time of the head position of each track is described in track 1. Alternatively,
It can be obtained from the data described in track 1.

Further, in this example, for the access points of the partial sequence, in addition to the time information, the attribute information indicating what kind of control is to be performed at the start or end point is also included in the item numbers 22 to 31. One of them, or a plurality of them are recorded.

FIG. 5 shows an example of one item packet in the sequence item table used for designating an access point of a partial sequence. As described above, the item number is one of the item numbers 22 to 31 that the manufacturer can freely define and use. In the following description, for example, the item packet of item number 22 is assumed to be for the access point of the partial sequence.

The data DI having the item contents shown in FIG.
INFO. It is described as text data using the character code defined by BIH. In this example, the value of the data is A, assuming Shift JIS as the character code.
Use the SCII code.

In the item content data DI of FIG. 5,
“E” is event data (2 bytes) and indicates control information at the time of partial reproduction, “EH” is the upper bit (1 byte), and “EL” is the lower bit ( 1 byte). Also, "M", "S", "F"
Indicates the time information of “minute”, “second”, and “frame”, and these indicate the position of the access point of the partial sequence by time. "MH", "S
“H” and “FH” are their upper bits (1 byte),
“ML”, “SL”, and “FL” are their lower bits (1 byte). In this case, the time information is the time information from the head position of the track of each song (sequence).

In the case of this example, the upper bit EH of the event data E is, as shown in the table of FIG. 6, a chorus point indicating that the access point is a chorus portion, and the nth chorus portion of the song. N-indicating that
The type of partial sequence to be designated, such as chorus point, is designated. Further, the lower bit EL of the event data is data for instructing in what kind of mode the start or end is at the point indicated by the item packet of the item number 22.

In the case of this example, as shown in the table of FIG. 6, at the access point designated by the item packet of item number 22, simply according to the code of the lower bit EL of the event data E, There are a mode of turning on (starting) and a mode of turning off (ending), and a mode of performing fade-in or fade-out with only an audio signal or only a video signal, and controlling fade-in or fade-out of both an audio signal and a video signal. Can be specified. In FIG. 6, (H) indicates hexadecimal display.

When there are a plurality of access points for each of the songs, the set of position data M, S, F and the data E of its attribute are sequentially added to the item number 2.
It is described in the data DI of the second item packet. That is, in the case of this example, in the data DI of the item packet of item number 22, each access point has 8 bytes (2 bytes of data E, M, S, and F, 8 bytes each). A plurality of access points in the song are recorded in order.

In the reproducing apparatus, the data DI of the item number 22 is divided into 8 bytes, and from the upper bit EH of the event data E, which is the first byte of the data of 8 bytes, the chorus point, n-chorus point, It is possible to identify an interlude point and the like, and from the lower bit EL of the next 1-byte event data E, it is possible to recognize what control can be performed at that point. Then, the position of the point can be known as time information from the third byte to the eighth byte MH to FL of the 8-byte data.

The reproducing apparatus prepares "reproduction only for chorus", "reproduction only for nth chorus", "intersection skipping", etc. as modes for reproducing only the chorus portion, and a mode input key corresponding thereto is provided as a key input section. To be installed in. The user simply performs a key input to specify the mode, and the playback device automatically searches the point positions to perform audio playback and video playback.

As described above, the position data of the access point of the partial sequence in any part of the item numbers 22 to 31 open to the user in the sequence item table, and further related to that point. If a video CD on which the attribute data is recorded is used, the sequence item
By using the information in the table, the partial sequence of the video CD can be easily reproduced.

However, as described above, it is necessary to decompress and decode the moving image data from the I picture position. However, with respect to the I picture, the standard stipulates that only one picture should be recorded within two seconds, and the recording position thereof is not specified. Therefore, it is possible that an I-picture is recorded at the beginning of the song or the beginning of the chorus, but the start and end positions of the chorus, prelude, and interlude are usually not always the same. It is considered that it is not in the I picture position. Therefore, when performing partial reproduction, even if the moving image data is expanded and decoded from the access point, the moving image cannot be obtained correctly as it is.

FIG. 7 is a diagram showing a relationship between an access point of a partial sequence and audio data and video data for a certain piece of music (one sequence).
In the video data of FIG. 7, the shaded portion indicates the I picture portion. The I picture is
As mentioned above, even at positions other than those shown in the figure, one is always recorded within 2 seconds.
In FIG. 7, for convenience of explanation, only I-pictures at positions relevant to the explanation of the present invention are shown.

In FIG. 7, P0 is the beginning point of the music, and corresponding to this, an I picture is recorded as video data. Similarly, P5 and P10
Are the start points of the second chorus (No. 2 of the song) and the third chorus (No. 3 of the song), and an I-picture is also recorded at this position as video data. This is the point at which reproduction is started in the partial sequence mode in which only the first chorus, the second chorus, or the third chorus is reproduced.

P1 is a point at which the prelude at the beginning of the first chorus ends, and the prelude end point P1 is used as a point at which reproduction is started when partial playback is performed by omitting the prelude. However, in FIG. 7, the video data corresponding to the audio data at the point P1 is not an I picture.

P2, P7 and P12 are the start points of the chorus parts of the first chorus, the second chorus and the third chorus, respectively, and P3, P8 and P13 are the end points of the respective chorus parts. is there. The start point of the hook portion is the reproduction start point, but in the example of FIG. 7, the video data corresponding to the audio data of this start point is not an I picture.

P4 and P9 are the starting points of the interlude of the first chorus to the second chorus and the interlude of the second chorus to the third chorus, and P6 and P11.
Is the ending point of the interlude. These points are used when omitting the interlude. The end point of the interlude is an access point at which reproduction is started in the interlude skip mode, and it is preferable that an I picture be recorded as video data corresponding to the audio data at this point. No I picture is recorded as such.

Therefore, in this embodiment, as will be described below, the moving image can always be correctly reproduced even in the partial reproduction and the restart of the reproduction from the skip.

[First Embodiment of Moving Image Playback Method for Version 1.0] From the video CD standard to the point 2 seconds before the access point, I
There is a picture. In the first embodiment, when the access point is a reproduction start point, prior to reproduction,
The I picture position within 2 seconds before the access point is searched for, and the reproduction decoding of the moving image data is started from the I picture. However, the reproduction output of the moving image signal is not output to the display monitor device. When the time information in the reproduction signal is monitored and reaches the access point, the expansion decoding of the audio information and the reproduction signal output are started, and the reproduction output of the moving image signal is output to the display monitor device.

In the case of the first embodiment, the audio information and the moving picture information related thereto are simultaneously reproduced from the access point. In addition, at the time of output, control according to the above-mentioned attribute of the access point, for example, control of fade-in is also performed.

[Second Embodiment of Reproduction Method of Moving Image in Version 1.0] In the first embodiment, an I picture before the access point is searched and the moving image data is reproduced from the I picture. I tried to decode it, but the second
In this embodiment, reproduction of moving image data is started from the I picture after the access point.

In the case of the second embodiment, the reproduction output of the audio information is started from the access point, but since the reproduction of the moving image information is delayed, the display on the display monitor is started after the delay. Will be done.

FIG. 1 is a block diagram of an example of the video CD reproducing apparatus described above. That is, in the reproducing apparatus of the example of FIG.
The signal recorded therein is reproduced from D1, and the reproduced signal is transmitted through the reproduction amplifier 11 to the EFM decoder circuit 1
2 and is subjected to processing such as EFM demodulation and error correction. The processed signal is supplied to the CD-ROM decoder circuit 13 to perform sector-by-sector decoding processing and output each signal. It

Then, of the output signals of the CD-ROM decoder circuit 13, the data of the first track 1 is taken into the microcomputer 15 via the system bus (consisting of an address bus and a data bus) 14, and thereafter, Used for playback control.

Further, the data of the compressed video signal in the output signal of the CD-ROM decoder circuit 13 is taken in by the MPEG video decoder circuit 31, and the original video signal, that is, for example, the luminance signal and the two color difference signals. Is decoded. Then, the decoded video signal is D / A converted into an analog signal in the D / A converter circuit 32, and the D / A converted video signal is supplied to the level control circuit 33 for fade-in or fade-out. To be done. The output video signal of the level control circuit 33 is the NTSC encoder circuit 3
4 and is encoded into an NTSC color composite video signal, and this video signal is output to a terminal 35.

The data of the audio signal of the output signal of the CD-ROM decoder circuit 13 is taken in by the MPEG audio decoder circuit 21, that is, the original audio signal, that is, the left and right channels of karaoke (performance). The audio signal is decoded, and the decoded audio signal is sent to the key control circuit 22.
Is supplied to.

Further, in this example, the key input unit 1
6 is provided, and the output of the key input unit 16 is supplied to the microcomputer 15. Then, the key input unit 16
The output of the operation unit for adjusting the speed of the song is supplied to the microcomputer 15, and the microcomputer 15 rotates the rotation speed of the video CD 1 and the decoder circuit 21,
31 is controlled to change the reproduction speed of the video signal and the audio signal according to the output of the input unit 15, and the key control circuit 22 corrects the change of the signal caused by the change of the speed.

Then, the audio signal from the key control circuit 22 is supplied to the mixer circuit 23. Also,
The singer's vocal audio signal is transmitted from the microphone 24 through the amplifier 25 to the A / D converter circuit 26.
Is supplied to the mixer circuit 23 and the A / D converted audio signal is supplied to the mixer circuit 23.

Then, in the mixer circuit 23, the karaoke audio signal and the vocal audio signal are mixed, that is, the karaoke-added audio signal is obtained, and this audio signal is sent to the D / A converter circuit 27. It is supplied and D / A converted, and this D
The / A converted audio signal is supplied to the level control circuit 33 for fade-in or fade-out, and the level-controlled audio signal is output to the output terminal 29.

Further, in this case, one of the item numbers 22 to 31 is described from the data of the table SITi among the data of the first track 1 fetched by the microcomputer 15 to the item number 22 in this example. The data relating to the reproduction of the partial sequence being reproduced is extracted and used for reproducing the partial sequence of the mode designated by the key input unit 16.

A case of performing partial reproduction of the hook portion using the reproducing apparatus described above will be described. In this case, in the video CD, information about the start point Ps and the end point Pe of the chorus portion of the target song is recorded on the track 1 as the data of item number 22 of the sequence item table for the target song. Be present.

Then, the item content ID relating to the point Ps is [EH, EL, MH, ML, SH, SL, FH, FL].
= [60, 39, 30, 31, 32, 32, 31, 3
0] and the item content ID relating to the point Pe is [EH, EL, MH, ML, SH, SL, FH, FL].
= [60, 31, 30, 31, 35, 32, 31, 3
5]. The data of these points Ps and Pe are sequentially recorded in the data DI.

In the partial reproduction information of the above example, the chorus point starts from the position of the designated song (sequence), that is, 1 minute 2 seconds 10 frames after the beginning of the track, and 1 minute 5 seconds 15 It ends with a frame, which means that the start is performed by fade-in for the audio signal and the video signal, and the end is performed by fade-out for the audio signal and the video signal.

When the user designates a song designation and chorus-only playback mode from the key input unit 16 of the playback device of FIG. 1, the microcomputer 15 causes the item number 22 of the sequence item table of the designated song.
Among the data of every 8 bytes related to a plurality of partial sequences of the data DI, the above data of each 8 bytes related to the chorus point is found by referring to the upper bit EH of each event data, and these points Ps and P
Write each 8 bytes of data for e into the buffer memory.

Then, the microcomputer 15 sets the data "M" of the first 8-byte chorus point Ps to "M",
With "S" and "F", the position on the video CD 1 to be accessed is calculated from the relative time from the beginning of the track of the designated music, and the tracking control unit 3 is controlled so that the position of the pickup 2 is the reproduction position. Try to be.

The control up to this point is the same in the case of the first embodiment and the case of the second embodiment of the reproducing method,
The control from this point onward is different between the case of the first embodiment and the case of the second embodiment.

First, the case of the first embodiment of the reproducing method will be described.

In the case of the first embodiment of the reproducing method, the pickup 2 is jumped to a position two seconds before the position of the access point in time, and the video sectors are sequentially picked up from that position of the video CD. , MPEG video decoder circuit 31 performs the decoding process. MPE
The G video decoder circuit 31 detects an I picture in the decoding process. Therefore, the moving image data is decompressed and decoded so that the reproduced output of the moving image can be correctly obtained from the I picture position. Then, the decoding process for the moving image data is continuously performed as it is.

During this period, the microcomputer 15 keeps the C
The elapsed playback time is calculated from the subcode in the data of the D-ROM sector structure and the absolute time information in the header. Then, the elapsed time is compared with the "M", "S", and "F" data relating to the chorus start point Ps captured in the buffer memory to monitor that the pickup position reaches the chorus start point Ps. To do.

When the start point Ps is reached,
The decoding process for the audio information is also started, and the microcomputer 15 controls the level control circuit 28 so that the reproduced audio signal can be output from the output terminal 29. At the same time, the microcomputer 1
Reference numeral 5 controls the level control circuit 33 to enable the output of the reproduced video signal of the moving image from the output terminal 35.

Then, the microcomputer 15 determines the operation at the start of the chorus reproduction from the lower bit "EL" of the event data E of the data regarding the found 8-byte chorus point Ps, and in the case of this example, the level is determined. The control circuits 28 and 33 are controlled to perform fade-in processing on the audio signal and the video signal.

Thus, in the case of the first embodiment of the reproducing method, the reproduction of the karaoke accompaniment music and the reproduction of the moving image are started at the same time.

Next, the case of the second embodiment of the reproducing method will be described.

In the case of the second embodiment, reproduction decoding of audio information is started from the access point,
Similar to the above-mentioned example, the microcomputer 15 performs the fade-in process to start the reproduction of karaoke accompaniment music.

On the other hand, for moving image data, MPEG
In the video decoder circuit 31, similarly to the above,
The decoding process for the video sector is performed sequentially,
The I-picture is detected by the decoding sequence and the moving image is reproduced correctly. Then, when the I picture is detected, the detection information is notified to the microcomputer 15. Therefore, the microcomputer 15 controls the level control circuit 33 to supply the reproduced video signal to the NTSC encoder circuit 34 and output the NTSC composite video signal to the display monitor device via the output terminal 35.

In this way, in the case of the second embodiment, the moving image is reproduced on the display monitor device with a delay after the karaoke accompaniment music starts, but a correct moving image is obtained and the access point From the I to the I-picture position, the maximum is 2 seconds, so the user does not feel so uncomfortable.

The processing at the ending point of the hook portion is the same processing in the first embodiment and the second embodiment.

That is, when the reproduction of the voice and the moving image starts from the start point Ps of the hook portion as described above, the microcomputer 15 performs the C operation in the same manner as described above.
The elapsed playback time is calculated from the subcode in the data of the D-ROM sector structure and the absolute time information in the header. Then, the elapsed time is collated with the “M”, “S”, and “F” data (11th to 16th bytes) relating to the end point Pe of the chorus that is loaded in the buffer memory, and the reproduction position is determined. Observes reaching the end point Pe of the chorus.

When the reproduction position reaches the end point Pe,
The microcomputer 15 determines the operation at the end of the chorus reproduction from the lower bit "EL" of the event data E relating to the point Pe, and in this example, controls the level control circuits 28 and 33 based on this to control the audio signal. And fade-out processing is performed on the video signal.

From the above, the user can operate the key input unit 16
Therefore, it is possible to easily reproduce only the chorus portion of the desired song by only designating the song and instructing the chorus-only mode.

[For Version 1.1 of Video CD Standard] In this version 1.1 as well, using the reproducing apparatus of FIG. 1, the item number 22 of the sequence item table in the karaoke basic information area of track 1 is used. Any one or more of .about.31 can be used to replay the partial sequence exactly as in version 1.0.

In version 1.1, as described above, in the video CD information area,
Position information that can be reproduced from the middle (position information in which an I picture is recorded) is recorded for each sequence in a table of entry points indicated by time (time information of up to 98 points per track is sequentially recorded. Recorded), so that partial playback can be specified using the information of this entry point.

That is, in this case, item number 2
The time information M, S, F is not required as the information regarding the partial reproduction recorded in the portions 2 to 31, and only the event data E as the attribute of each entry point is recorded in association with the entry point. I'll do it. Although various methods can be considered for associating, for example, the event data E of the attribute of each point may be described as the data DI of any of the item numbers 22 to 31 in the same order as the entry point.

Further, as data DI, information for designating an entry point in the entry table for the sequence (for example, what order),
The event data E may be paired to form access point data of each partial sequence, and the entry point may be associated with the start or end point of the partial sequence.

In the case of using this entry point information, there are a method of designating an entry point before the access point and a method of designating an entry point after the access point.

In the case of the method of designating the entry point before the access point, after starting the decoding processing of the moving image data from the entry point, the first case in the case of the above-mentioned version 1.0 is performed. The same processing as in the embodiment is performed.

Further, in the case of the method of designating the entry point after the access point, the reproduction / decoding of the audio information is started from the access point similarly to the second embodiment in the case of version 1.0 described above. Similarly to the above-described example, the microcomputer 15 performs, for example, a fade-in process to start the reproduction of karaoke accompaniment music. On the other hand, with regard to the moving image data, in the microcomputer 15, the position of the designated entry point is monitored by monitoring the time in the same manner as described above, and when the entry point is reached, the moving image data is started from that point. Is decoded and the reproduction output is derived, and output to the display monitor device, and reproduction of the moving image is started from that point in time after the reproduction of the audio information.

In the above, by inputting the type of the access point recorded on the video CD from the key input unit 16, the access point is designated. However, the access point is directly input from the key input unit 16. In the case of designating and starting playback from the designated access point as well, the playback of the moving image information is performed by searching the I picture position before or after the access point in the same manner as above. By performing decoding and reproduction based on the I picture position,
The same effect as above can be obtained.

In the above example, the position information of the access point of the partial sequence is the time information from the head position of each track, but it is not limited to this.
For example, absolute time information on the disc and reproduction output information P
The time information of TS may be used.

[0096]

As described above, according to the present invention, by using the recording medium in which the positional information necessary for the partial reproduction is recorded, the audio reproduction of the portion desired by the user in one sequence is performed. And video playback can be done easily. Then, when starting the partial reproduction,
As for moving image data, first, one frame of image data, which is a reference for compression encoding, is found and played back, so that a correct moving image can always be played back.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a reproducing apparatus to which a reproducing method according to the present invention is applied.

FIG. 2 is a diagram for explaining a recording format of a video CD.

FIG. 3 is a diagram for explaining data recorded on track 1 of a video CD.

FIG. 4 is a diagram for explaining a sector structure of a video CD.

FIG. 5 is a diagram showing an example of data recorded according to the present invention.

FIG. 6 is a diagram for explaining an example of an attribute of data recorded according to the present invention.

FIG. 7 is a diagram for explaining a positional relationship between an access point for partial reproduction and an I picture.

FIG. 8 is a diagram for explaining a recording state of an audio signal and a video signal on a video CD.

[Explanation of symbols]

 1 Video CD 13 CD-ROM Decoder Circuit 15 Microcomputer 21 MPEG Audio Decoder Circuit 23 Mixing Circuit 28 Level Control Circuit 31 MPEG Video Decoder Circuit 33 Level Control Circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 20/12 103 9295-5D 27/10 A 8224-5D H04N 5/765 5/781 5/92 H04N 5/92 H 8224-5D G11B 27/10 A

Claims (5)

[Claims] 1. Audio information of one or more sequences is recorded, and moving image information related to the audio information is recorded.
For images at appropriate intervals, all of the image information of one frame is compressed and recorded, and for images other than the image, change information of image information of previous and subsequent frames is compressed, and further, predetermined. A reproducing method for reproducing the audio information and the moving image information from a recording medium in which information of access points of partial sequences in one sequence is recorded in a recorded area, At the start of reproduction, the moving image information is detected by detecting the recording position of the image data in which all the image information of the one frame which is a predetermined time before the access point is compressed and recorded. The decoding process of the moving image data is started from the recording position, and the audio information and the moving image are transmitted from the access point. Reproducing method of audio information and video information, characterized in that so as to output a reproduced signal of the image information. 2. Audio information of one or a plurality of sequences is recorded and moving image information related thereto is recorded.
For images at appropriate intervals, all of the image information of one frame is compressed and recorded, and for images other than the image, change information of image information of previous and subsequent frames is compressed, and further, predetermined. A reproducing method for reproducing the audio information and the moving image information from a recording medium in which information of access points of partial sequences in one sequence is recorded in a recorded area, Upon starting reproduction, the audio information outputs a reproduction signal from the access point, and the moving image information is an image in which all the image information of the one frame after the access point is compressed and recorded. Detects the data recording position and starts decoding the moving image data from the detected position. And, reproducing method of audio information and video information, characterized in that so as to output a reproduction signal of the video information. 3. One or more sequences of audio information are recorded and associated video information,
For images at appropriate intervals, all of the image information of one frame is compressed and recorded, and for images other than the image, change information of image information of previous and subsequent frames is compressed, and further, predetermined. The information of the access points of the partial sequences in one sequence and the above 1 in the vicinity of this access point are stored in the created recording area.
A reproduction method for reproducing the audio information and the moving image information from a recording medium on which information indicating an image position in which all the image information of a frame is compressed and recorded is recorded, the access point of the partial sequence When starting reproduction from the moving image information, the moving image information is the audio information that starts decoding from the image position indicated by the information indicating the image position where all the image information of the one frame is compressed and recorded. Reproduction method with moving image information. 4. When the image position indicated by the information indicating the image position where all the image information of the one frame is compressed and recorded is a position temporally before the access point, a moving image is displayed. The method for reproducing audio information and moving image information according to claim 3, wherein a reproduction signal of information is output from the access point. 5. A moving image when the image position indicated by the information indicating the image position where all of the image information of the one frame is compressed and recorded is a position preceding the access point in time. The reproduction method of audio information and moving image information according to claim 3, wherein a reproduction signal of information is output immediately.