JPS59214389A - Recording and reproduction system for video format signal - Google Patents

Abstract

PURPOSE:To explain a picture more effectively by adding explanation to the picture not only by voice, but also by a character. CONSTITUTION:A digitized audio signal is wtitten at a sampling frequency in a buffer memory 21 for time-axis compression. A character signal is encoded by an encoder 22 into a digital code, which is outputted. A video signal, time-axis compressed data signal SWS in the buffer memory 21, encoded signal of the character signal, and control signal are inputted to a switching circuit 23. The selection control over the circuit 23 is performed by a timing signal generator 24. The internal oscillator of the signal generator 24 synchronizes with the synchronizing signal in the input video signal to generate various timing signals according to an external control signal. A video format signal to be recorded is obtained from the output of the circuit 23 as shown in a figure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and reproducing method for a video format signal, and more particularly to a method for recording and reproducing video information and audio information as a video format signal on the same recording track of a recording medium.

When audio information corresponding to video information is recorded on the same track of a recording medium together with the video information, the A-dio information is digitized and inserted into a part of the video format signal while compressing the time axis, and the remaining part is There is a method for inserting video information. As a new type of such system, the applicant has proposed a so-called SWS (3t+++
A picture with 5ond) method has been proposed in Japanese Patent Application No. 186565/1983. According to this SWS method, a two-dimensional screen obtained by a video format signal is divided into multiple blocks, audio information is inserted into a predetermined block, video information is inserted into the remaining blocks, and control information is inserted and recorded. However, this control information includes information for controlling various aspects of the reproduction operation of the reproduction system in addition to information indicating the block into which the A-dio information has been inserted. - By doing this, it becomes possible to record the procedure 1 for the playback operation, that is, the software, on the recording medium itself, and it becomes possible to record a series of mutually related video information and a series of video information that corresponds to this series of video information. It is possible to reproduce the information in any desired combination with audio information. Therefore, a wide range of uses such as so-called video files and educational software are possible.

An example of a series of video software based on the SWS method is shown in FIG.
It is inserted while compressing the shaft between the four. Although not particularly shown, control data is inserted at the beginning of each recorded portion of A-dio data and still image information, so that it is possible to distinguish between audio data and still image information during playback. It has become.

FIG. 2 shows a block of the SWS system playback system, in which video format signal output from a video sub-disc player (VD player) 1 is sent to the M device 2 for control (21I signals).

The separated control signal is sent to the control device 3, and the other video signals and A-dio data are sent to the data separation device 4, respectively. The data separation device 4 separates the video signal and audio data, and writes the video signal to the display 11 and the audio data to the memory 5. The audio data read out from the memory 5 is decoded as audio by the audio decoding device 6 and sent to the audio switching device 7.

The audio switching device performs switching between decoded audio and normal video audio, and sends this to the speaker 8. The control device 3 also sends identification signals for video signals and audio data to the data separation device 4, sends timing signals for writing and reading audio data to the memory 5, and sends control signals to the audio switching device 7 and VDPI, respectively. Sending out.

Next, the operation of the above system will be explained.

First, a frame of the time-axis compressed audio data shown in FIG. 1 is played back and taken into the memory 5, and the VDPI is switched to the still image playback mode at the next still image frame. During this time, the audio data taken into the memory 5 is time-axis expanded and taken out. When the audio has finished playing, cancel the still image playback mode of VOPI,
Move to playback of the next frame.

In the above system, audio quantization is performed using 4-bit AD
P CM (A adaptive D 1ffe
(rental PCM) method, and assuming that the sampling frequency is 20K and the data recorded in a 1711 frame is 15 kilobytes, the audio recorded in one frame is approximately 1.5 seconds. Normally, as shown in Figure 1, predetermined audio is obtained by adding several frames of audio data to one still image.

In the above system, the still image is explained by voice, but sometimes the voice explanation alone is insufficient, and it would be more effective if the explanation is given by the letter "J" or by the voice and the letter. be. In addition, the playback time of the above system with audio data added is about 40 times that of video only (1.5 seconds ÷ 1/30 seconds - = 45 seconds).
), and it is desired to record even more information.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording and reproducing method that can provide a more effective image explanation by adding not only an audio explanation but also a written explanation to the corresponding image. That's what I mean.

The recording method according to the present invention stores time-axis compressed data of audio information corresponding to a series of mutually related video information as well as predetermined bits of digitized character information corresponding to the video information in frames preceding the series of video information. It is characterized by inserting and recording inside.

The reproduction method according to the present invention is recorded using the above recording method! When playing back a recording medium, time-axis compressed data and digitized character information are stored in memory, and at the same time as the corresponding series of video information is played, the time-axis compressed data is read out from this memory while being time-axis expanded and played back. At the same time, the present invention is characterized in that the character information is also read out, a character pattern corresponding to the read out is generated by the character pattern generating means, and this character pattern is inserted into the reproduction screen of the corresponding video information.

The present invention will be explained below using the drawings.

FIG. 3 is a block diagram of a recording system for obtaining a video format signal according to the recording method of the present invention, in which an analog audio signal is digitized by an A/D converter 20. This digital signal is written to the buffer 7 memory 21 for time-base compression at the Zumbling frequency. By reading data from the memory 21 at a frequency higher than the writing frequency, time axis compression is achieved. What about character signals? It is digitally encoded and outputted by the V-encoding equipment 22. The control signals include start and end signals of SWS data, still image reproduction instruction signals, and start and end signals of character data.

a series of interrelated video signals (which may correspond to several frames or a single frame);
SWS whose time axis is shortened by buffer memory 2-1
A data signal, an encoded signal of a character signal, and a control signal are input to the switching circuit 23, respectively. The selection operation of the switching circuit 23 is controlled by a timing signal generator 24. This timing signal generator 24
In this case, an internal oscillator is synchronized with a synchronizing signal of an input video signal, and various timing signals are generated in response to an external control signal. A recording-1-power video format signal is obtained from the output of the switching circuit 23.

FIG. 4 is a schematic diagram of an example of a recording video format signal obtained by the blocks in FIG.
Audio data and character data corresponding to No. 3 are inserted and recorded in several frames preceding the recording frame of each still image.

In this example, audio data for several frames and character data for one frame are shown as being recorded, but the present invention is not limited to this.

FIG. 5 is a block diagram of a reproducing system for reproducing a recording disk on which the video format signal obtained in this way is recorded, and parts equivalent to those in FIG. 2 are indicated by the same reference numerals. In the figure, the video output on VDPl is sent to control signal separation device 2. The separated control signal is sent to the control device B3, and the other video signals and A-dis character data are sent to the data separation device 4, respectively. The data separation device 4 separates the video signal from the audio/text data, and the video signal is written into the video switching device 10 and the audio/text data is written into the memory 5. Among the data read from the memory 5, the audio data is decoded as audio by the audio decoding device 6 and sent to the audio switching device 7.

Furthermore, a character pattern is generated from the character data by the character generator 9 and sent to the video switching device @10. The kansei kirikesou 7 switches between compressed audio data and normal moving image audio, and sends this to the speaker 8.

The video switching device 10 switches and adds video signals and character patterns in order to display images, characters, or images and characters superimposed on the display 11.

The control device 3 also controls the data I! 11 Sends a video signal A-dis and a character data identification signal to the device 4, and sends an audio A/character data loading/reading timing signal and an audio data and character data identification signal to the memory 5; Shoseikiri T4 device, video switching device, VD
Control signals are also sent to P.

In this configuration, first, a frame of A-dis character data is reproduced, this is loaded into the memory 5, and the VDPI is switched to the static and heavy reproduction mode at the still image frame. Of the data taken into the memory 5 during this time, audio data is time-expanded and extracted as sound, and character data is taken out as a character pattern.
display on the display. When the reproduction of audio or text is completed, the still image reproduction mode of the vDPl is canceled and the reproduction of the next frame is started. Note that the data separation device 4 identifies whether the video output of the VDP 1 is a video signal or audio/character data, and separates the audio/character data.
Only character data is written to the memory 5.

In addition, the menu 5 identifies whether the written data is audio data or character data, and if it is audio data, it is sent to the audio decoding device 6, which identifies whether it is character data, and if it is audio data. If it is, it is sent to the voice decoding device 6, and if it is character data, it is sent to the character generating device 9. For this reason, identification signals for video signals, audio data/character data, and other control signals are recorded at predetermined positions on the video disc, and during playback, these control signals are imported into the control device 3, and from there, identification signals are sent to each part. , and other control signals.

In the above example, audio data or character data is recorded in each frame, but video signals, audio data, and character data may be mixed in one frame, and not only still images but also multiple The same applies to moving images spanning frames.

As described above, in this invention, part or all of the video signal of a video disc is replaced with audio data and character data and recorded, and characters are added in addition to audio as supplementary explanations for images and other information. More effective explanations can be provided than in the case of only audio. Furthermore, text can provide a much larger amount of information than speech.

Here, let's compare the amount of information when using voice and the amount of information when using text. In this system, assuming that one character (including Kanji) is represented by 2 bytes and the data recorded in one frame is 15 kilobytes, the number of characters recorded in one frame is 7500.
If you read this out loud at a rate of 250 characters per minute, it will be 30.
Equivalent to minutes. This is 1,200 times as long as the 1.5 seconds when recording the A-dio data mentioned above.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of one system of video software, Figure 2 is a block diagram of a video format signal reproduction system currently being proposed by the applicant, and Figure 3 is an implementation of the recording system of the present invention. FIG. 4 is a diagram showing an example of a recording pattern of a video format signal obtained by the recording system of FIG. 3, and FIG. 5 is a block diagram of an embodiment of the reproduction system of the present invention. Explanation of part codes 1...VDP 2...Control signal unit 3...Control device 4...Data separation device 5...・Memory 6...Voice decoding device 9...Character Brahma generation device

Claims (2)

[Claims] (1) A recording method in which audio information is inserted into a part of a video format signal containing video information while compressing the time axis and recorded on a recording medium, and the audio information corresponding to a series of mutually related video information and the same A recording method characterized in that character information made into a digital signal of predetermined bits corresponding to the video information is recorded in a frame preceding the series of video information. (2) Insert and record time-axis compressed data of audio information corresponding to a series of mutually related audio information and predetermined bits of digitized character information corresponding to the video information in a frame preceding the series of video information. When reproducing a recording medium made of The digitized character information is read out and reproduced while the axis is expanded, and a character pattern corresponding to the digitized character information is generated by the character pattern generation means, and this character pattern is inserted into the playback screen of the corresponding video information. A playback method characterized by the following.