JPH04364684A - Data reproduction device and orchestral accompaniment equipment - Google Patents

Abstract

PURPOSE:To reproduce continuously data groups of plural kinds without intermission. CONSTITUTION:A data read from a CD-ROM by a CD-ROM drive 1 is written in an FIFO memory 3. The read of the data from the FIFO memory 3 is inhibited till a data quantity in the FIFO memory reaches a prescribed quantity. After the data reaches a prescribed quantity, the data read from the FIFO memory 3 is reproduced by a post-stage reproduction section 100. The data written to the FIFO memory 3 is interrupted for a data group retrieval period at changeover of the data group to be reproduced and the reproduction data for this period is supplemented by the data read in advance to the FIFO memory 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a data reproducing device.
In particular, it relates to something suitable for use in karaoke equipment.

0002

2. Description of the Related Art A laser disc player is an example of a data reproducing device applied to a karaoke machine. Such a player can play back accompaniment as well as video. Video FM signals and audio FM signals are recorded on the laser disc.
The signal and the audio CD (compact disc format) signal are frequency multiplexed and recorded. Of these, audio F
Two channels of the M signal are prepared, with monaural accompaniment recorded on one channel and the singer's singing voice recorded on the other channel. Furthermore, a stereo accompaniment signal is assigned as the audio CD signal. In addition to the normal karaoke function, the player is equipped with various functions regarding audio playback. For example, stereo audio and a singer's singing voice can be played simultaneously. Alternatively, in such playback, there is also a function that automatically turns off the singer's singing voice when the user starts singing a song. In such a player,
Since three types of audio signals are prepared, a wide variety of functions can be realized in audio reproduction.

[0003] However, only one type of video is assigned to each song on a disc used in such a karaoke apparatus. Therefore, in video output,
It is not possible to add various functions to the player, such as the audio output described above. On the other hand, when multiplexing several types of video signals using the frequency multiplexing method described above, the frequency band of the video signal must be further expanded to higher frequencies.
Technically difficult. Furthermore, when recording several types of video signals in different areas on the disc, the recording area required for one song increases, and the recording efficiency of the disc decreases. In addition, in this case, if the video is switched during playback, the video signal is recorded in a different area on the disc, so data reading will be interrupted while searching for this area. This causes the player to interrupt playback.

0004

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a karaoke apparatus that can switch videos without causing such inconvenience.

[0005]

[Means for Solving the Problems] In view of the above-mentioned problems, the present invention provides a data reproducing device for reproducing a medium in which a plurality of data groups are compressed and recorded in physically different areas. a data reading means for reading the read data; a reproduction means for reproducing the read data;
A memory interposed between the data reading means and the reproducing means and storing the read data, and a retrieving means for retrieving one of the data groups, and sequentially reading out the data stored in the memory at the time of such retrieval. It is characterized in that it is supplied to the reproducing means.

[0006]Furthermore, the karaoke apparatus plays back a medium in which a plurality of types of video data are compressed and stored in physically different areas together with audio data, and includes data reading means for reading data recorded on the medium. a reproducing means for reproducing the read data; a memory interposed between the data reading means and the reproducing means for storing the read data; and a retrieving means for retrieving one of the video data groups. The present invention is characterized in that the data stored in the memory are sequentially read out during this search and supplied to the reproducing means.

[0007]

According to the present invention, by compressing data and recording it on the medium, the efficiency of recording data on the medium can be improved. Furthermore, when searching for a predetermined data group, the data stored in the memory is read out in order and supplied to the reproduction means, so that no interruption of reproduction occurs during this search.

[0008]

[Embodiment] A karaoke apparatus according to an embodiment of the present invention will be described below.

First, the disc used in this karaoke apparatus will be explained. In this karaoke machine, CD
-Using a ROM disk. The disc has a CD-RO
The data is recorded in the M format, and the innermost part has a T that shows the table of contents information of the songs recorded on the disc.
OC (Table Of Contents) is recorded. Compressed video data and audio data are allocated to the data area of the CD-ROM format. Intel's DVIT is used to compress video data.
An efficiency coding scheme with M can be used. Furthermore, the ADPCM method can be used to compress audio data.

[0010] According to the CD-ROM standard, in mode 1,
It can record 153,600 bytes of digital data per second. On the other hand, when audio data is encoded using the ADPCM method with a sampling frequency of 32 KHz and 4 bits per sample, a sound quality almost equal to that of FM radio can be obtained. With this ADPCM method, audio data is
When recording on 2 channels of R, 32,000 (H
Z) x 0.5 (byte/sample) x 2 channels = 3
The amount of data is 2,000 (bytes/second). Therefore,
Video data can be allocated to the remaining 153,600-32,00=121,600 (bytes/second). With this amount of data, if the DVITM encoding method is used, it is possible to obtain a video with an image quality comparable to that of NTSC television at 30 frames/second.

FIG. 3 shows an example of the data format of music information for one song recorded on a track of a disc. Incidentally, as mentioned above, such data can be stored on a CD-ROM.
They are recorded in order in the data area of the format. Furthermore, the data in the music data section and the extended data section are composed of audio data and video data, and each data is compressed as described above. The data in the header part does not need to be compressed, but may be compressed if necessary.

As shown in FIG. 3, header data is first recorded on the recording track. The data in the header section is structured as shown in the figure, and serves to provide a table of contents for the music data section and the extended data section. The header data is stored in the RAM within the device and is used to control the reproduction of music data.

[0013] The music data section stores audio data and video data to be reproduced. That is, by reproducing the data in the music data section in order from the first address, the audio and video outputs of the song can be obtained. In this music data section, n switching periods are prepared. In this embodiment, the number of switching periods corresponds to the number of lyrics in the song. That is, it is possible to switch the video between lyrics. Therefore, such a switching period is inserted into the music data section so as to correspond to the period between lyrics. When the data reading position reaches the switching period, data for the switching period prepared in the extended data section is selected, and the selected data is reproduced during this period. When the reproduction of the data for this switching period is completed, the process returns to the music data section to reproduce the data following the switching period.

In FIG. 3, the switching period prepared in the music data section is shown as if the data is blank.
In reality, such a blank space does not exist, and the video data and audio data of this period are skipped on the track.
The video data and audio data before this period and the video data and audio data after this period are connected and recorded continuously. The header address of the switching period in the header section specifies the address of the data joint. When the device reads this address, it searches for data for the switching period in the extended data section and moves on to reading data for this period. And when we finish reading the data for this period,
It searches for the address of the first half connection and moves on to reading the following data.

[0015] In the extended data section, two types of data are prepared corresponding to each switching period to compensate for the data of the switching period. Among the various types of data, the audio data is data corresponding to the music of the interlude part that maintains the continuity of the music. On the other hand, regarding the video data, Data 1 is assigned data that is appropriate for the video so that continuity of the video can be maintained, and Data 2 is assigned data that is appropriate for the video that is different from the previous video, such as a scoring list. . The selection of extended data is
The user selects preset data before playback.

Next, a karaoke apparatus for playing such a CD-ROM disc will be explained. FIG. 1 shows a block diagram of such a karaoke apparatus. In the figure, 1 is CD-
ROM drive device; 2 is a CD-ROM control unit that controls the CD-ROM drive device; 3 is a FIFO (Fast I
n Fast Out) memory.

Reference numeral 100 denotes a playback section that plays back data from the FIFO memory 3, of which 4 is a data distribution section that distributes the data output from the FIFO memory into video data and audio data, and 5 is a playback section that plays back the data output from the FIFO memory 3. 6 is a memory that stores the expanded video data for one screen; 7 is a display control unit that controls reading of the video data stored in the memory; 8 is the read video data. 9 is an NTSC monitor; 10 is an audio decompression unit that decompresses the audio data distributed by the data distribution unit 4 to create L channel and R channel data; 11 , 12 are D for converting the L channel and R channel digital audio data into analog signals, respectively.
A converters 13 and 14 are mixers that add the audio signal input from the microphone 16 via the microphone interface 15 to the signals from the DA converters 11 and 12; 17 and 18 are amplifiers that amplify the mixer output; 19; 20 is a speaker.

The operation of each section described above is performed by the system control section 2.
Controlled by 00. Such system control unit 200
consists of a CPU 21 , a program ROM 22 , a program RAM 23 , an operating section interface 24 , and a timing control section 25 . A signal from the operating section 26 is input to the operating section interface 24 .

Next, the operation of this karaoke apparatus will be explained according to the flowchart shown in FIG. First, C
When a D-ROM disk is set in the CD-ROM drive device 1, the system control unit 200 reads the TOC from the CD-ROM via the CD-ROM control unit and stores it in the program RAM 22 (step 1). Next, when the TNO corresponding to the song you want to sing is input from the operation unit 26, the system control unit 200 checks the start address of the track specified by the TNO based on the TOC and issues a command to search for this track start address. to the CD-ROM control section 2. The CD-ROM control section 2 controls the CD-ROM accordingly.
The drive device 1 is caused to perform the search operation.

When such a search is executed, the header data of the music information data for one song shown in FIG. 7 is first read out from the CD-ROM. The header data is stored in the program RAM 22 in the system control unit 200 (step 2). When the reading of the data in the header section is completed, the data in the music data section is then read, and this data is sequentially written into the FIFO memory 3. 2 x Mn x NMAX (seconds) for FIFO memory 3
Reading of data is prohibited while the data for the number of minutes is written (step 3). Here, Mn is the number of switching periods within the song, and NMAX is the longest search time required to search for switching period data in the extended data section. M
n is included as header data. Since NMAX is not included as data in the header section, it is determined based on the size MS of the music data section.

[0021] When a certain amount of data is written to the FIFO memory 3 in this way, the data is read out from the FIFO memory 3 at a constant speed, and the subsequent circuit starts expanding and reproducing the data. (Step 4). After the playback of such data starts, on the other hand, the CD-
Writing of the data read from the ROM to the FIFO memory 3 continues (steps 5, 6, 7), while data is read from the FIFO memory 3 (step 8). Here, the writing speed and reading speed of data to the FIFO memory 3 are on average the same unless the writing is interrupted. Therefore, in this case, FIFO memory 3
The amount of data within is kept at the constant amount.

The data read out from the FIFO memory 3 is then judged by the data discrimination section 4 as to whether it is video data or audio data (step 9), and if it is video data, it is determined according to steps 10 to 14. It is displayed on the monitor 9, and if it is video data, it is output from the speakers 19 and 20 in steps 15-20. The video data and audio data are reproduced until the end of the song (step 21). The end point of the song is detected by detecting that all the data in the FIFO memory 3 has been read out.

By the way, in steps 5 to 7, C
When the reading point of the CD-ROM disk by the D-ROM drive 1 reaches the switching period shown in FIG. 3, the reading of the data (data 1 or data 2) of the corresponding extended data section is started as described above. Furthermore, when the reading of the extended data section is completed, the process returns to reading the music data section again. When reading such extended data,
Since the extended data section and the music data section are recorded in physically different locations on the disc, a search operation is required when reading from the extended data section and when returning from the extended data section to the music data section. Become. During such a search, reading of data from the CD-ROM is interrupted, so no data is written to the FIFO memory 3. Therefore, during this period, FIF
The data stored in the O memory 3 decreases as data is read from the FIFO memory 3.

FIGS. 4 and 5 are diagrams showing the selection of data and the data storage state of the FIFO memory 3 during the switching period. In such a case, there are two switching periods within one song, and in switching period 1, data 1a is selected, and in switching period 2, data 2b is selected. If the maximum search period NMAX for one time is N, there are two switching periods, so in the FIFO memory 3, according to the above formula, 2×2×N=4N data are first stored as the music data shown in FIG. The data is written to the FIFO memory at the beginning of reading the data. After writing such data, the data writing speed and reading speed to and from the FIFO memory 3 are constant, so the amount of data in the FIFO memory 3 is kept constant.

However, when the data read position on the CD-ROM reaches the switching period shown in FIG.
- The ROM drive device 1 is located at a physically different position on the CD-ROM (track position following the music data section)
In order to search for the extended data portion recorded in the FIFO memory 3, writing of data to the FIFO memory 3 is interrupted during this search period. Since this interruption time is at most the maximum search period N, at the time of this search, the FIF
The amount of data in the O memory 3 decreases by up to N seconds. When reading of the data in the extended data section is completed, the CD
- The ROM drive device 1 searches for the switching period in order to return the read position to the switching period of the music data section. Even during such a search, the amount of data in the FIFO memory 3 decreases by up to N seconds. Therefore, the amount of data in the FIFO memory 3 decreases by 2N seconds at most for one switching period. In the examples shown in FIGS. 4 and 5, there are two switching periods, so searching according to the switching period can result in up to four
Data for N seconds is reduced. On the other hand, in the FIFO memory 3, data for 4N seconds is read ahead and recorded using the above formula, so the FIFO memory 3 is
Even if writing of data to the FO memory 3 is interrupted, the data in the FIFO memory 3 will not become empty due to such interruption. Therefore, even during such a search, video and audio can be played back without interruption.

As described above, according to this embodiment, it is possible to switch the video during playback of a song without causing any interruption in the video or audio.

It should be noted that the present invention is not limited to this embodiment, and various other modifications are possible. For example, 1
The format of the data constituting the song is not limited to the example shown in FIG. 3 above, and other formats may also be used. That is, in the above embodiment, continuous video data and different types of video data are prepared in the extended data section.
Alternatively, continuous video data may be inserted into the music data section in a form inserted during the switching period of the music data section, and only different types of video data may be prepared in the extended data section.

[0028]

[Effects of the Invention] According to the present invention, several types of data groups can be prepared on a medium with a small amount of data, and even if the data group to be reproduced is changed during reproduction, there is no interruption in data reproduction. It can be played back as a series of data without any problems.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an embodiment.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a diagram showing a signal format of an embodiment.

FIG. 4 is a diagram showing an example of data switching.

FIG. 5 is a diagram showing the amount of data in a FIFO memory.

[Explanation of symbols]

1 CD-ROM playback device (data reading means) 2
CD-ROM control section (search means) 3 FIFO memory (memory) 100 playback section (playback means)

Claims (2)

[Claims] 1. A data reproducing apparatus for reproducing a medium in which a plurality of data groups are compressed and recorded in physically different areas, the apparatus comprising: a data reading means for reading data recorded on the medium; a reproducing means for reproducing the read data, a memory interposed between the data reading means and the reproducing means and storing the read data, and a retrieving means for retrieving one of the data groups, A data reproducing device characterized in that the data stored in the memory is sometimes sequentially read out and supplied to the reproducing means. 2. A karaoke apparatus that plays back a medium in which a plurality of types of video data are compressed and stored in physically different areas together with audio data, the apparatus comprising: a data reading means for reading data recorded on the medium; , a reproducing means for reproducing the read data, a memory interposed between the data reading means and the reproducing means and storing the read data, and a retrieving means for retrieving one of the video data groups. A data reproducing apparatus, characterized in that the data stored in the memory is sequentially read out and supplied to the reproducing means at the time of such a search.