JPS623470A - Video signal recording medium and its reproducing device - Google Patents

Abstract

PURPOSE:To execute the real time simultaneous reproduction of both data of a picture and voice without using a RAM for a voice data by setting each block length of a recording medium to the length corresponding to the sampling rate of the voice. CONSTITUTION:For a gate circuit 5, an opening signal and a closing signal are supplied, the voice data in an input signal from an input terminal 1 for one scanning are passed through to the (l) bit data of the beginning, one piece of (l) bit data are supplied successively to a D/A converter 13 and processed by the real time. In such a way, each block length L0 of video signal recording media comes to be the length corresponding to the sampling rate of the voice, and a reproducing device reads successively the voice data to one piece of sampling data at every scanning, and reads all picture data at the time of one scanning. Thus, without the RAM for voice data, the data of the video and the voice can be simultaneously processed and reproduced by the real time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording medium and a reproducing apparatus thereof, which are capable of simultaneously reproducing still image data and audio data recorded together in real time.

[Summary of the invention]

In the present invention, a short sound is recorded together with a still image,
In a video signal recording medium and its reproducing device that reproduce still images and audio together, the length of each block of the recording medium is set to correspond to the audio sampling rate, and this one block is repeatedly repeated. In addition to reproducing still images by scanning, this 1
By sequentially reading out the audio data in a block one sampling data at a time for each scan, the audio data is played back in real time at the same time as the still image data.

[Conventional technology]

Recording short sounds together with still images on a disk-shaped recording medium and playing them back together is convenient for providing information on various learning aids or products.

Conventionally, the following methods have been used to reproduce sound recorded on a disk-shaped recording medium together with a still image when the still image is reproduced.

First, the audio data recorded in the audio data recording area of the recording medium is read out and written into a RAM (Random Arrangement Memory). Here, audio data is recorded for each still image.

Then, when the still image data (for one sheet) recorded over multiple tracks of the recording medium is played back by repeatedly reading it, the audio data in the RAM is synchronized with this playback. are output sequentially while extending the time. As a result, still image data and audio data having different transfer rates are matched, and the audio is reproduced simultaneously with the still image.

[Problem that the invention seeks to solve]

Conventionally, when playing back still images and audio recorded on a disk-shaped recording medium at the same time, the audio data read out from the recording medium at once is written to RAM, and then synchronized when the still image is played back. RAM was outputting audio data.

Therefore, it is necessary to provide a RAM for audio data and a control circuit for this RAM in the playback device, which causes problems in that the playback device becomes larger and costs increase.

Therefore, the present invention was proposed to solve these conventional problems, and provides a video signal recording medium and its video signal recording medium that can simultaneously reproduce still image data and audio data in real time without using a RAM. The purpose of the present invention is to provide a playback device, thereby making it possible to reduce the size and cost of the playback device.

[Failure to solve the problem]

In order to achieve this object, the video signal recording medium of the present invention has each recording block on the disk recording surface set to a block length corresponding to the sampling time of audio data, and in each recording block, a synchronization signal and an audio data are stored. and image data are sequentially recorded as a signal train, and the audio data consists of a plurality of sampling data.

Further, in the playback device of the present invention, each recording block on the disk recording surface is set to a block length corresponding to the sampling time of audio data, and a synchronization signal, audio data, and image data are sequentially transmitted in each recording block. When reproducing a video signal recording medium in which the audio data is recorded as a column and the audio data is composed of a plurality of sampling data, the recording medium is a synchronization signal separation circuit that separates the synchronization signal from another readout signal; and an image data regeneration circuit that reproduces the image data from the readout signal based on the synchronization signal from the synchronization signal separation circuit during one scan. and an audio data reproducing unit that reproduces audio data of one sampling data from the read signal during the one scan, and an audio data reproducing unit that reproduces audio data of one sampling data from the readout signal, and an audio data reproducing unit that reproduces audio data of one sampling data from the readout signal, and an audio data reproducing unit that reproduces audio data of one sampling data from the readout signal, so that the audio data of the next sampling data is sequentially read out each time the recording block is repeatedly read. The present invention is characterized by comprising a control circuit that generates a control signal based on the synchronization signal from the synchronization signal separation circuit and supplies it to the audio data reproducing section.

[Effect]

The length of each block of the video signal recording medium corresponds to the audio sampling rate. When the above playback device plays back the audio data and image data in one block, the audio data is sequentially read out one sampling data per scan, and the image data is read out all at once during one scan. ing.

Therefore, audio data and image data can be simultaneously played back in real time without using a RAM for audio data.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. First, a video signal recording medium according to the present invention will be explained. FIG. 1A shows a recording format of a signal recorded on this video signal recording medium, and a disk-shaped recording medium such as an optical disk is used as this recording medium. The recording format described above is configured such that image data reproduced from a recording medium can be displayed on a display device such as a liquid crystal display comprising a large number of pixels. Further, the information signal shown in the above recording format indicates one block BLK of recording data recorded in a spiral shape on the recording surface of the disk-shaped recording medium. This one block BLK is composed of a synchronization signal sy, address data ad, audio data As, and image data VS. Further, the block length L0 of each block BLK is determined to correspond to the audio sampling rate.

The synchronization signal sy is provided as a delimiter for each block, that is, a delimiter for recording data, and also serves as a synchronization signal when the address gator ad, audio data AS, and image data vS are reproduced by a reproducing apparatus to be described later. Further, the address data ad indicates the display position on the screen when the image data vS is displayed on a liquid crystal, for example. By decoding the address data ad, the image data S consisting of i components is sequentially displayed on the screen. will be displayed. This display order can be arbitrarily predetermined.

Furthermore, the audio data ad has a data block length L□
consists of 1 bit data. This L bit data 1
Each corresponds to one sampling data. That is,
One bit corresponds to the number of quantization bits. here,!
, is a suitable integer.

Further, the image data vS has a data block length L2
is made up of i pieces of j-bit data.

Here, Jt'' is a well-known integer.One j-bit data corresponds to, for example, one point on the screen.This image data vS consisting of i pieces of J-bit data is
As shown on the display screen 1 in the figure, based on the address data ad, the information is sequentially displayed in units of j bits in the lateral force direction, for example.

Here, tnn corresponds to i pieces.

The one block BLK of recording data having such a format is recorded over N tracks on the recording surface of a disk-shaped recording medium. Then, a still image is displayed on the screen 1 based on the image data vS while the bus scan is repeated by scanning and reading the N tracks multiple times by, for example, an optical pickup. Here, during one scan in which the one block BLK is read from the beginning to the end, the synchronizing signal sys, address data ad, and all image data vS covering the data block L2 are read out.

Also, during this one scan, one L-bit data corresponding to one sampling data is read out and decoded from the audio data As. Then, the next sampling data t bits are sequentially read every scan, and by scanning k times, all the audio data AS over the data block length L1 is read out. Therefore, if the block length L0 is the audio sampling time (sampling time), and k is 100, for example,
For example, 10 seconds of audio is reproduced by 100 scans in which all the audio data As is read. At this time, a still image is reproduced for 10 seconds based on the image data vS. Also, if we continue the 1x scan k times,
The same audio is played back r times.

Next, a reproducing apparatus for reproducing the video signal recording medium having these five configurations will be explained based on the block diagram of FIG. 1B.

First, the signal read out from the disc-shaped recording medium of the video signal recording medium by, for example, an optical pickup is
It is input to input terminal 2. The signal that entered input terminal 2 is
The signal is supplied to a synchronization signal separation circuit 3, an address data separation circuit 4, a gate circuit 5, and an image data reproduction circuit 6.

In the synchronization signal separation circuit 3, the synchronization signal sy of the above-mentioned one block BLK A of the recorded data is separated and taken out, and sent to the address data separation circuit 4 and the image data reproduction circuit 6.

Since this is predetermined, the above-mentioned address data ad is separated and decoded based on this synchronization signal sy. This address data ad is sent to the display control circuit 7 and the start address detection circuit 8.

In the image data reproducing circuit 6, the image data vS is separated based on the synchronization signal sy, and the image data vS having the data block length L2 is reproduced. The reproduced image data vS is sent to the display control circuit 7.

The display control circuit 7 generates a display signal for sequentially displaying the image data vS consisting of one bit data on the screen of the display device 9 based on the address data ad. This display signal is sent to a display device 9 such as a liquid crystal display device consisting of a plurality of pixels. Note that, when the display device 9 is a cathode ray tube (CRT) display device, the display control circuit 7 is supplied with a conversion instruction signal from the system controller 0 for converting the display signal to a signal for CRT display. be done.

? The display device displays a still image based on the display signal.

Further, the head address detection circuit 8 detects the head address of the input address data ad, and supplies this detection output to the counter 11 as a clock signal. Since this head address is detected every time the optical pickup scans the recording track of one block BLK, the detection output is an output for every scan.

Each time the counter 1 counts the above detection output,
The color output P is sequentially increased by 1 and output. A clear signal is also input to this counter 1 from the system controller 0.

Since the audio data As consists of L pit data, the system controller o supplies a clear signal to the counter 11' when, for example, P=. The counter output P is supplied to the gate control circuit 12.

In the gate control circuit 12, the signal length of the synchronization signal sy is M□
If the data length of the bit and address data ad is M2, after the number of bits shown by M, +M2'+ CP - 1) J has elapsed, an open signal to open the gate circuit 5 is output, and the signal is shown by M1+M2+PA. After the number of bits has elapsed, a close signal that closes the gate circuit 5 is output. Here, 1 is the number of bits corresponding to the audio data AS of one sampling data.

Since the gate circuit 5 is supplied with the above open signal and close signal, the input terminal 1 is
The first 1-bit data of the audio data As of the input signal from the input signal A is passed through. This piece of 1-bit data is sequentially supplied to the D/A converter 13 and processed in real time.

Therefore, by repeating the scan k times, the data block length L! All of the audio data As is read out, subjected to I/A converter-to-analog conversion processing, and outputted as audio from the speaker 14 after being amplified.

Note that during the continuation of this second scan, the still image is displayed on the display device 9 based on the reproduced image data VS.

In this way, each block BLK of the video signal recording medium
block length. has a length corresponding to the audio sampling rate, and one block BLK records audio data As consisting of image data vs and a plurality of sampling data. In the above playback device, 1
Audio data is read out one sampling data at a time for each scan, and all image data V is read out in one scan.
I am trying to read out S.

Therefore, without using RAM for audio data,
Video data vs and audio data As can be simultaneously processed and played back in real time.

Note that the data block length L2 may be long, a plurality of still image data may be recorded, and the still images may be sequentially reproduced.

〔Effect of the invention〕

As explained above, according to the present invention, the length of each block of the video signal recording medium is set to a length corresponding to the audio sampling rate. Then, every scan corresponding to the audio sampling time, audio data of one sampling data in the block is read out, and all image data is read out at this time.

Therefore, image data and audio data can be simultaneously played back in real time without using a RAM for audio data.

By eliminating the need for RAM in this way, the playback device can be made smaller and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1A is a signal recording format diagram of a video signal recording medium according to the present invention, FIG. 1B is a block diagram of a playback device according to an embodiment of the present invention, and FIG. 2 is a diagram of a display device used in the playback device. It is a figure showing a screen. 1.0.Screen 4...Address data separation circuit 5..Gate circuit 6.--.Image data reproduction circuit 8.--Start address detection circuit 9.--.Display device No. 11 ψ.Color/R12. 0・Gate control circuit 13・−・Converter to D/

Claims (2)

[Claims] (1) Each recording block on the disk recording surface is set to a block length corresponding to the sampling time of audio data, and a synchronization signal, audio data, and image data are sequentially recorded as a signal sequence in each recording block, A video signal recording medium characterized in that the audio data consists of a plurality of sampling data. (2) Each recording block on the disk recording surface is set to a block length corresponding to the sampling time of audio data, and a synchronization signal, audio data, and image data are sequentially recorded as a signal sequence in each recording block, When reproducing a video signal recording medium in which the audio data consists of a plurality of pieces of sampling data, during one scan of the disk recording surface for reading out the recording block once at the sampling time, from the read signal from the recording medium. a synchronization signal separation circuit that separates the synchronization signal; an image data regeneration circuit that reproduces the image data from the readout signal based on the synchronization signal from the synchronization signal separation circuit during the one scan; , an audio data reproducing unit that reproduces the audio data of one sampling data from the read signal; and a control signal that controls the audio data of the next sampling data to be sequentially read out each time the recording block is repeatedly read. A playback device comprising: a control circuit that generates a synchronization signal based on the synchronization signal from the synchronization signal separation circuit and supplies it to the audio data playback section.