JP2000315090A - Device and method for reproduction and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproducing device which is capable of conducting reproduction from a specific portion within a piece of music or conducting reproduction of only a specific portion while conducting a moving image reproduction. SOLUTION: The reproducing method performs reproduction of a video CD from the midst of a piece of music (a sequence) or only the middle portion of a piece of music. In a recording medium used in this method, the information on an access point of a partial sequence among one sequence is recorded on a first track 1 of a video CD. When an I picture does not exist in an access point while starting a reproduction from the access point of the partial sequence, the recording position of an I picture in the vicinity of that point is detected and a decoding process of moving image data is started from the detected recording position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium on which audio information and moving picture information are recorded, such as a karaoke moving image CD (compact disk), and the like. The present invention relates to a reproducing method and a reproducing apparatus for reproducing image information.

[0002]

2. Description of the Related Art One of the standards of CD-ROM is a video CD. This video CD records moving picture information together with audio information, and is put to practical use for so-called karaoke.

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

[0004] That is, an audio signal is a digital signal, and is recorded after being compressed by a compression encoding method utilizing psychoacoustic characteristics. Also, the moving image signal is converted into a digital signal, one screen is divided into blocks, and discrete cosine transform (DCT) is performed for each block to reduce the code amount according to the change of the image.
According to (Variable Length Code), a code having a higher appearance frequency is assigned a shorter code, and the code amount is recorded so as to reduce the code amount as a whole.

In the case of moving image data, a difference between a screen in which a change is predicted from a past or future screen and an actual screen is extracted, and the difference and a predicted change amount are recorded. , The amount of data is compressed. However, since a demodulated image cannot be obtained only by the difference data or the predicted change amount, the data of the image of one screen (one frame) serving as the reference is compression-encoded as it is without referring to other images. Record. As described above, the reference image that is compression-coded without referring to another image is I
Called a picture. Other images that can be said to be change information for the I picture are called P pictures and B pictures.

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

As will be described later in detail, each sector includes information for distinguishing between an audio sector and a video sector.
Information on the absolute time on the disc, information on the time at which a moving image or sound is output during playback (corresponding information on the playback timing of the moving image and sound) is recorded, and based on this information,
In the playback device, each tune and its associated moving image are played back.

By the way, as is apparent from the above description of the moving image data compression encoding method, if an I picture is lost, a correct demodulated image cannot be obtained. For this reason, 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 if the position of the I picture is not known when reproducing from the middle of the process.

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

Version 1 of the video CD format
1 (Ver.1.1), in an area (first track 1 as will be described later) where information about the number of songs on the disc and the recording data on the disc is recorded, a position where an image in the middle of the track can be reproduced (the entry point and the entry point). ) Is recorded as time information. The entry point is information on the position of the I picture. By performing reproduction while referring to this point, image reproduction is enabled even during partial reproduction or fast-forward reproduction.

[0011]

By the way, a CD moving picture karaoke system conforming to version 1.0 of the video CD format as described above has been realized. Due to changes in the environment surrounding the karaoke market, such as the difficulty in remembering music, the emergence of so-called karaoke boxes, and the transition of usage fees from song-based to time-based systems, the following requirements for karaoke CDs Is coming out of the market.

That is, it is desired to sing only a characteristic part of a song called a chorus in the song.

[0013] I want to sing only the first or only the second of the songs, or want to round up the singing at the second. I want to fast-forward and skip sections that are not related to singing, such as the interlude section in a song, and sections that I'm not good at. And so on.

However, in the prior art, since there was no way for the reproducing apparatus to know the position of the specific partial sequence as described above, the user searched for the start and end points of the partial sequence, and It is necessary to operate the playback device to achieve omission, which is troublesome. In particular, when limiting the position of a partial sequence that depends on a song, such as when playing only the chorus part, it is necessary to perform the operation not only at the start position of the partial sequence but also at the position where the partial sequence ends. Operation is cumbersome.

Also, as described above, in the video CD format version 1.0, since the information on the position of the I picture is not recorded on the disc, the reproduction is started from the middle of a certain music as described in the above. In some cases, it is difficult to reproduce a moving image related to the moving image.

Version 1 of the video CD format
In the case of No. 1, since the position of the I picture is known as an entry point, it is possible to play back a moving image even from the middle. However, as in the above cases, when starting playback from a specific part of the music, It is not possible to specify whether it is preferable to start playback from the entry point.

According to the present invention, as described above, even when a piece of music (sequence) is reproduced from a middle part (partial sequence) or a part is omitted, the partial reproduction and omission can be easily performed. It is another object of the present invention to provide a reproducing apparatus and a reproducing method capable of reproducing a moving image correctly from the point of resuming reproduction after omission at the start of the partial reproduction.

[0018]

According to a first aspect of the present invention, there is provided a reproducing apparatus comprising: a first image data serving as a reference which has been compressed and encoded; In a reproducing apparatus for reproducing a recording medium on which compression-encoded second image data as image change information and management data for managing a recording position of a partial sequence in the one continuous sequence are recorded,
A reproducing unit for reproducing the first image data, the second image data, and the management data; and, based on the management data reproduced by the reproducing unit, in the one continuous sequence. Transfer control means for transferring the reproduction means to a recording position of the partial sequence, and whether or not the first image data is recorded at a position where the reproduction means is transferred by the transfer control means based on the management data. Detecting means for detecting whether or not the first image data is not recorded at the position where the reproducing means has been transferred based on the management data, Transferring the reproducing means to a recording position of the first image data recorded near a position to which the reproducing means is transferred based on management data. That.

In the reproducing apparatus according to the first aspect of the present invention, a partial sequence in one continuous sequence such as a rust portion is performed based on the management data. That is, the transfer control means transfers the reproduction means to the recording position of the partial sequence based on the management data. At this time, the first point
It is detected whether or not the image data (I picture) is recorded. If the I picture is not recorded, the reproducing means is moved to the position of the I picture in the vicinity.

Thus, even when a partial sequence is reproduced from the middle of one sequence, a moving image can always be reproduced correctly.

[0021]

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

Before describing embodiments of the reproducing apparatus and method according to the present invention, the format of a video CD will be described. FIG. 2 is a diagram for explaining a recording format on a video CD. That is, as shown in FIG. 2, the video CD has a lead-in track at the beginning, similar to a normal CD-ROM, and includes a track 1 to N of N (N ≦ 99) data and a lead-out track. Followed by a track. Then, the compressed audio information and the compressed moving image information are recorded on the second and subsequent tracks 2 to N among the tracks 1 to N. Each track from track 2 to track N corresponds to one song (one sequence), and a video CD can record N-1 songs.

In the first track 1, a video C
This track 1 records various information and data related to the contents of D, and the fact that the video CD is in the karaoke format is also described in this track 1.

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. The karaoke basic information area contains basic information about karaoke on the disc for each language according to the country in which the disc is used. J
P (for Japan), KARINFO. US (for the United States),..., And the number of basic information for each country and the number of songs on the disc are described. B
IH.

As basic information on 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 music piece. 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 for the video CD, called a disk item table,
IT0 is provided. The disc item table SIT0 records a disc title, the total number of songs, a disc catalog number, and the like.

Sequence item table SITi
(I = 1 to (N-1)) has 64 item columns.
The items include essential items and optional items, and the length of the content in each item column is variable. Therefore, the sequence item table SIT
At the head of i, information GL indicating the length of the table is provided. The data of each item is called an item packet, and each item packet has an item number (item number) INo. And information IL on the length of the item,
The content DI (text data) of the item.

FIG. 3 shows the structure of the table SITi. For example, the item number 9 is an item column of a song title, and the content thereof is data indicating the song title as text data. Alternatively, the item number 18 is an item column for lyrics, and the lyrics are stored in the form of text data.
The item columns of the item numbers 22 to 31 are open to the maker, and the maker can freely define and use it.

In the video CD version 1.0, as described above, the position of the I picture in the compressed moving image data is not prepared as information, but in the version 1.1, the first track In the video CD information area, an entry table in which a recording position of a predetermined I picture is set as an entry point and is represented by time information on a disc so that the entry point can be used for fast-forward playback or playback from the middle is provided. Is provided. This 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 time information of the entry point.

Next, FIG. 4 shows the data structure of the video sector and the audio sector. As shown in FIG. 4, one sector has a structure in which a header and a subheader are added before a data group called a 2324-byte pack. The header records absolute time information from the innermost circumference to the sector in minutes, seconds, and frames. Further, the subheader includes submode information, and from the submode information, whether the sector is a video sector,
Can be recognized as an audio sector.

The contents of packs 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 head of the pack. The “pack start” of the pack header is data indicating that the pack starts from that position, and is “SCR (System Code Reference)”.
Is data indicating the time for reading the pack data,
“MUX rate” indicates a 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 are different 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 the packet data, and the “buffer size”
Is information indicating the buffer size required for decoding.

Further, “PTS (Present Time Stamps)
) "Indicates the time during which the playback device outputs a moving image or sound. By referring to the PTS, the playback device recognizes which image is to be output at a certain sound output timing.

The packet header is common to the video sector and the audio sector up to the “PTS”. In the audio sector, compressed audio data is recorded after the “PTS”. On the other hand, in the case of a video sector, a “DTS (Decode Time Stamp)” that further describes a time for sending data to a decoder after “PTS”.
) "Is provided, and then the compressed video data is recorded.

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

[Case of Video CD Standard Version 1.0] In this example, as described above, the entry point information is not 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 in the karaoke basic information area of the first track 1 described above that can be freely defined and used by the manufacturer are used. In the column, information on the access point of the partial sequence is recorded. The information of the access points of these partial sequences is recorded as time information from the head position of each track. The time at the head position of each track is described in track 1. Or,
It can be obtained from the data described in track 1.

In this example, for the access point of the partial sequence, the item numbers 22 to 31 are added together with the time information and the attribute information indicating what control is to be performed at the start or end point. Is recorded in any one or a plurality.

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

The data DI of the item contents shown in FIG.
INFO. It is described as text data using a 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.
“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). 1 byte). "M", "S", "F"
Indicates time information of "minutes", "seconds", and "frames", and indicates the position of the access point of the partial sequence in time. "MH", "S
H ”and“ FH ”are those upper bits (1 byte),
“ML”, “SL”, and “FL” are those lower bits (1 byte). In this case, the time information is time information from the start position of the track of each song (sequence).

In the case of this example, as shown in the table of FIG. 6, the high-order bit EH of the event data E is a chorus point indicating that the access point is a chorus part, and the nth chorus part of the music. N-
This indicates the type of the partial sequence to be specified, such as a chorus point. The lower bit EL of the event data is data for instructing how to start or end at a 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 specified by the item packet of the item number 22, simply according to the code of the lower bit EL of the event data E, An aspect of turning on (starting) and off (ending), and an aspect of performing fade-in or fade-out control with only an audio signal or only a video signal, or with both an audio signal and a video signal. Can be specified. In FIG. 6, (H) indicates a hexadecimal display.

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

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

The playback device prepares "play only rust", "play only n-th chorus", "play interlude" and the like as modes for playing only the chorus portion, and presses a mode designation key corresponding to the key input section. To be provided. The user simply performs a key input for designating the mode, and the playback device automatically searches for each of the point positions, and performs audio playback and video playback.

As described above, in the sequence item table, the position data of the access point of the partial sequence and the position data of the access point in any one of the item numbers 22 to 31 open to the user. If a video CD on which attribute data is recorded is used, in the playback device, 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 perform the decompression decoding of the moving image data from the I picture position. However, with regard to I-pictures, only one picture is always recorded within two seconds according to the standard, and the recording position is not particularly defined. For this reason, it is conceivable that an I picture is recorded at the beginning of a song or the beginning of a chorus. However, in the part of the chorus, the prelude, the interlude, and the like, usually, the start position and the end position are not necessarily set. It is considered that the position is not the position of the I picture. For this reason, when performing partial reproduction, even if the decompression decoding processing of the moving image data is performed from the access point, the moving image cannot be correctly obtained 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 song (one sequence).
In the video data of FIG. 7, the hatched portions indicate the I picture portions. The I picture is
As described above, even in the position other than the position shown in the figure, it is recorded that there is always one within a two-second interval.
FIG. 7 shows only I-pictures at positions relevant to the description of the present invention for convenience of description.

In FIG. 7, P0 is a head point of a music piece, and an I picture is recorded as video data corresponding to P0. 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 a point at which reproduction is started in a partial sequence mode in which only the first chorus, the second chorus, or the third chorus is reproduced.

P1 is a point where the first preamble of the first chorus ends, and this precedent end point P1 is used as a point from which reproduction is started when partial reproduction is performed without 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 starting points 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 climax part is the reproduction start point, but in the example of FIG. 7, the video data corresponding to the audio data at this start point is not an I picture.

P4 and P9 are the start points of the interlude between the first and second choruses and the interlude between the second and third choruses, and P6 and P11.
Is the end point of the interlude. These points are used when skipping the interlude. The end point of the interlude is an access point where reproduction is started in the interlude omission 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, a moving image can always be correctly reproduced even when the reproduction is resumed from partial reproduction and omission, as described below.

[First Embodiment of Video Playback Method for Version 1.0] According to the video CD standard, an I-picture must be used within two seconds before the access point. Exists. In the first embodiment, at the time of an access point at which reproduction is to be started, an I-picture position within 2 seconds before the access point is searched prior to reproduction, and reproduction decoding of 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. Then, when the time information in the reproduction signal is monitored and reaches the access point, the expansion decoding of the audio information and the output of the reproduction signal 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, audio information and moving picture information related thereto are reproduced simultaneously from the access point. At the time of output, control in accordance with the attribute of the access point described above, for example, control of fade-in, etc., is performed.

[Second Embodiment of Moving Image Reproducing Method for Version 1.0] In the first embodiment, an I picture before an access point is searched, and moving image data is extracted from the I picture. I tried to play and decode,
In the second embodiment, reproduction of moving image data starts from an I picture after an access point.

In the case of the second embodiment, the reproduction output of the audio information starts from the access point, but the reproduction of the moving image information is delayed, so that the display on the display monitor is delayed by the delay. Will be started.

FIG. 1 shows an embodiment of a reproducing apparatus according to the present invention.
1 is a block diagram showing an example of the reproducing apparatus of FIG. That is, in the reproducing apparatus of the example shown in FIG. 1, the signal recorded on the video CD 1 is reproduced by the optical pickup 2, and the reproduced signal is transmitted through the reproduction amplifier 11.
The signal supplied to the FM decoder circuit 12 is subjected to processing such as EFM demodulation and error correction. The signal subjected to this processing is supplied to the CD-ROM decoder circuit 13 and subjected to sector-by-sector decoding processing. Is output.

Then, among 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 (composed of an address bus and a data bus) 14, and thereafter, Used for playback control.

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

The audio signal data of the output signal of the CD-ROM decoder circuit 13 is taken into the MPEG audio decoder circuit 21 and the original audio signal, that is, the left and right channels of the karaoke (play). The audio signal is decoded, and the decoded audio signal is transmitted to the key control circuit 22.
Supplied to

Further, in this example, the key input unit 1
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 music is supplied to the microcomputer 15, and the microcomputer 15 controls 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 in accordance with the output of the input unit 15, and the key control circuit 22 corrects the change in the signal caused by the change in the speed.

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

Then, in the mixer circuit 46, the karaoke audio signal and the vocal audio signal are mixed, that is, the vocal is added to the karaoke audio signal, and this audio signal is sent to the D / A converter circuit 27. Is supplied and D / A converted.
The / A-converted audio signal is supplied to a level control circuit 33 for fade-in or fade-out, and the level-controlled audio signal is output to an output terminal 29.

Further, in this case, from the data of the table SITi in the data of the first track 1 loaded into the microcomputer 15, the data is described in one of the item numbers 22 to 31, in this example, the item number 22. The data relating to the reproduction of the partial sequence that has been performed is extracted and used for reproducing the partial sequence in the mode specified by the key input unit 16.

A case where the rust portion is partially reproduced by using the above-described reproducing apparatus will be described. In this case, in the video CD, information on the start point Ps and the end point Pe of the rust portion of the target song is recorded on the track 1 as data of the item number 22 of the sequence item table for the target song. Shall be

Now, 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 for 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 in the above example, the chorus point starts from a designated song (sequence), that is, a position after a lapse of 1 minute, 2 seconds, and 10 frames from the beginning of the track, and starts at 1 minute, 5 seconds, 15 minutes. The process ends with a frame, and the start means that the audio signal and the video signal are faded in, and the end means that the audio signal and the video signal are faded out.

When the user designates a song and instructs the mode of playing only the chorus from the key input section 16 of the playback device shown in FIG. 1, the microcomputer 15 sets the item number 22 in the sequence item table of the designated song.
Of the data DI of each of the plurality of partial sequences, the upper data EH of each event data is referred to to find the above data of every 8 bytes relating to the climax point, and these points Ps and Ps are found.
Write 8 bytes of data for e to the buffer memory.

Then, the microcomputer 15 sets "M" of the data of the rust point Ps of the first 8 bytes,
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 song by “S” and “F”, and the tracking control unit 3 is controlled to change the position of the pickup 2 to the reproduction position. So that

The control up to this point is the same in the case of the first embodiment of the reproduction method and in the case of the second embodiment, but the subsequent control is the same as in the first embodiment. Is different from 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, and video sectors are sequentially picked up from the position of the video CD, and MPEG
The video decoder circuit 31 performs a decoding process. M
The PEG video decoder circuit 31 detects an I picture through the decoding process. Therefore, the extended decoding of the moving image data is performed so that the reproduced output of the moving image can be correctly obtained from the I picture position. Then, the decoding process on the moving image data is continuously performed as it is.

During this time, the microcomputer 15 sets C
The playback elapsed 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 data of "M", "S" and "F" relating to the rust start point Ps taken into the buffer memory, and it is monitored that the pickup position reaches the rust start point Ps. I do.

When reaching the start point Ps,
The decoding process for the audio information also starts, 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 rust reproduction from the lower bit “EL” of the event data E of the found data on the rust point Ps of 8 bytes. By controlling the control circuits 28 and 33, fade-in processing is performed 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 start simultaneously.

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

In the case of the second embodiment, reproduction and decoding of audio information is started from the access point, and the microcomputer 15 performs a fade-in process to perform karaoke accompaniment music in the same manner as in the above-described example. Playback starts.

On the other hand, for moving image data, MPEG
In the video decoder circuit 31, as described above,
Decoding processes for video sectors are sequentially performed,
An I picture is detected by the decoding sequence, and a moving image is correctly reproduced. When an I picture is detected, the microcomputer 15 is notified of the detection information. 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 via the output terminal 35.

Thus, in the case of the second embodiment, the moving picture is reproduced on the display monitor device with a delay after the karaoke accompaniment music is started. Since the time from the point to the I-picture position is at most two seconds later, the user does not feel much discomfort.

The processing at the end point of the rust portion is the same processing in the first embodiment and the second embodiment.

That is, as described above, when the reproduction of the sound and the moving image starts from the starting point Ps of the rust portion, the microcomputer 15 makes the C
The playback elapsed 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 data of the “M”, “S”, and “F” (11th to 16th bytes) relating to the end point Pe of the rust taken into the buffer memory, and the reproduction position is determined. Is monitored to reach the rust end point Pe.

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

As described above, the user operates the key input unit 16
By simply designating the song and instructing the rust-only playback mode, it is possible to easily play back only the chorus portion of the desired song.

[In the case of version 1.1 of the video CD standard] Also in this version 1.1, using the playback apparatus of FIG. 1, the item number 22 of the sequence item table in the karaoke basic information area of the track 1 is used. Using any one or a plurality of the sub-sequences, the reproduction of the partial sequence can be performed in exactly the same way as in the case of version 1.0.

In version 1.1, as described above, the video CD information area contains
A table of entry points indicated by time is recorded for each sequence as position information (position information where an I picture is recorded) that can be reproduced from the middle (time information up to 98 points per track is sequentially recorded). ), It is possible to specify partial reproduction using the information of the entry point.

That is, in this case, item number 2
Time information M, S, and F are unnecessary as information relating to partial reproduction to be recorded in portions 2 to 31, and only event data E as an attribute of each entry point is recorded in association with the entry point. Keep it. Although various methods of associating are possible, for example, the event data E of the attribute of each point may be described as any one of the item numbers 22 to 31 in the same order as the entry point.

As the data DI, information for designating (for example, what number) an entry point in the entry table for the sequence,
The event data E may be paired with access point data of each partial sequence so that an entry point is associated with a start or end point of the partial sequence.

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

In the case of the method of designating the entry point before the access point, after the decoding processing of the moving image data is started from the entry point, the first method in the case of version 1.0 described above is started. Processing similar to that of the embodiment is performed.

In the method of designating the entry point after the access point, the reproduction decoding of the audio information from the access point is performed in the same manner as in the second embodiment in the case of version 1.0 described above. Is started, and the microcomputer 15
Thus, for example, a fade-in process is performed, and the reproduction of the karaoke accompaniment music is started. On the other hand, with respect to the moving image data, the microcomputer 15 monitors the time of the position of the designated entry point in the same manner as described above. And the reproduction output is derived, and the reproduction output is outputted to the display monitor device, and the reproduction of the moving image is started from that point in time after the reproduction of the audio information.

In the above description, the type of the access point recorded on the video CD is input from the key input unit 16 to designate the access point. Even in the case where playback is designated and the playback is started from the designated access point, in the same manner as described above, the playback of the moving image information is performed by searching for the I picture position before or after the access point, and By performing decoding and reproduction based on the I picture position,
The same operation and effect as described 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 is not limited to this.
For example, information on the absolute time on the disc or the reproduction output information P
The time information of the TS may be used.

[0094]

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

[Brief description of the drawings]

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

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

FIG. 3 is a diagram for describing 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, 1
5 microcomputer, 21 MPEG audio decoder circuit, 23 mixing circuit, 28 level control circuit, 31 MPEG video decoder circuit, 33 level control circuit

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Claims (7)

[Claims] A first image data as a reference which has been compression-encoded; a second image data which has been compression-encoded as image change information before and after the reference image data;
In a reproducing apparatus for reproducing a recording medium on which management data for managing a recording position of a partial sequence in the one continuous sequence is recorded, the first image data, the second image data, and the management Reproducing means for reproducing data; transfer control means for transferring the reproducing means to a recording position of a partial sequence in the one continuous sequence based on the management data reproduced by the reproducing means; Detecting means for detecting whether or not the first image data is recorded at a position where the transfer means is transferred by the transfer control means on the basis of the management data; and If it is detected based on the data that the first image data is not recorded at the position where the reproducing means has been transferred, the management data The recording position of the first image data recorded in the vicinity of the position transferring the reproduction means based on the data, the reproduction apparatus characterized by transferring the reproduction means. 2. The reproducing apparatus according to claim 1, wherein the first image data recorded near a position to which the reproducing unit has been transferred based on the management data is the first image data based on the management data. A reproducing apparatus, wherein the first image data is recorded before the position where the reproducing means is transferred. 3. The reproducing apparatus according to claim 1, wherein the first image data recorded near a position to which the reproducing unit has been transferred based on the management data is based on the management data. A reproducing apparatus, wherein the first image data is recorded after a position where the reproducing means is transferred. 4. A compression-coded reference first image data, a compression-coded second image data which is image change information before and after the reference image data,
In a reproducing method for reproducing a recording medium on which a management data for managing a recording position of a partial sequence in the one continuous sequence is reproduced, the management data is reproduced, and based on the reproduced management data, A reproducing head is moved to a recording position of a partial sequence in the one continuous sequence, and it is detected whether or not the first image data is recorded at a position where the reproducing head is moved based on the management data. If it is detected by the detection that the first image data is not recorded, the first image data recorded near the position where the reproducing head is transferred based on the management data The reproducing head is transported to a recording position. 5. The reproducing method according to claim 4, wherein the first image data recorded near a position to which the reproducing head has been transferred based on the management data is based on the management data. A reproduction method, wherein the first image data is recorded before a position where a reproduction head is transferred. 6. The reproducing method according to claim 4, wherein the first image data recorded near a position to which the reproducing head has been transferred based on the management data is based on the management data. A reproduction method, wherein the first image data is recorded after a position where a reproduction head is transferred. 7. A compression-encoded first image data recorded at predetermined intervals and a compression-encoded first image data as image change information before and after the reference first image data. 2 is a recording medium on which management data for managing a recording position of a partial sequence in the one continuous sequence is recorded, and a recording position of the partial sequence managed by the management data; A recording medium characterized by including a portion that does not match a recording position of a first image data which is recorded at every predetermined interval and serves as a reference for compression-encoding.