JPH0359503B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing method, and more particularly to a recording method for simultaneously recording video information and audio information corresponding thereto on a recording medium, and a reproducing method thereof.

When recording a predetermined length of image information (still images or moving images) with audio explanations on a video disk, which is a recording medium, there is a method of compressing the audio information in the time axis and inserting it into a section of the video format signal. . That is, audio information is time-axis compressed and recorded in a predetermined frame section out of a group of N TV frames, video information is recorded in the remaining frame sections, and these N frame groups are treated as two segment information. It consists of

To play such a video disc, the audio information recorded in a predetermined frame section is read out and stored in a temporary storage means, and then the audio information is read out from the storage means while playing back the image information of the remaining frame sections. is read out, expanded on the time axis, and played back in real time. Details of such a recording/reproducing system can be found in the specification of Japanese Patent Application No. 56-38497 (Japanese Unexamined Patent Publication No.
57-152786).

In the conventional method described above, it is necessary to compress the time axis in order to record audio information, and it is necessary to expand the time axis in order to reproduce it, which complicates the configuration of the device and increases costs. Become.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording and reproducing method that has an extremely simple configuration and can record a large number of image segment information with audio explanations onto a recording medium to create a so-called video file.

The recording and reproducing system according to the present invention was developed in view of the fact that video discs have separate recording channels (frequency channels) for video information and audio information. For example, if you want to file 300 segments of image information (still images or videos) with 10 seconds of audio explanation on one side of the disk, the recording time on one side of the disk will be approximately 30 minutes.
Since it is a minute (1800 seconds), only 1800/300 = 6 seconds of audio explanation can be added. but,
Since a disk generally has a plurality of audio channels, by making good use of the plurality of channels, it is possible to add an audio explanation for 6×n seconds (n is the number of audio channels).

Therefore, in the recording method according to the present invention, a plurality of image segment information is continuously recorded on a video channel, and n audio information corresponding to n pieces of arbitrary continuously recorded image segment information are recorded on n audio channels. It is characterized in that it is recorded so that each recording section of the n audio information is approximately equal to the total recording section of the n image segment information.

The playback method according to the present invention, when playing back a recording medium recorded as described above, squelches the playback output of image segment information unrelated to audio information contained in a specific audio channel at the time of playback. It is characterized by

The present invention will be explained below using the drawings.

FIG. 1 shows the frequency spectrum of recorded information having two audio channels in addition to one video channel.
The video signal is subjected to FM (frequency modulation) processing,
For example, the pedestal level is 8.1MHz, the white peak level is 9.3MHz, and the sink level is 8.1MHz.
A in the figure after frequency conversion to 7.6MHz
The spectrum is shown in . B and C are
2.3 and 2.8 MHz audio carriers are shown, each of which is subjected to FM processing using two channel audio signals.

A schematic diagram illustrating an example of such a recording system having two audio channels in addition to one video channel is shown in FIG. Each of the video segment information is V _a , V _b , V _c , ..., V _g ,
..., these are sequentially recorded on the video channel _, and at the same time, audio information A a , A c , A e corresponding to the video segment information V _a , V _c , V _e , V _g , ..., respectively, is recorded on the first _{audio channel} . , A _g , ... are recorded in sequence. Further, audio information A _b , A _d , Af , . . . corresponding to the video segment information V _b , V _d , V _{f ,} . . . respectively is sequentially and continuously recorded on the second audio channel. At this time, each start point of the video segment information is made to coincide with each start point of the audio information corresponding to each of these segment information, and as a result, the audio information A _a , A _b ,
Each recording section of A _c , . . . is twice as long as each recording section of the image segment information. If each recording section of image segment information is equivalent to 6 seconds, that of audio information will be equivalent to 2×6=12 seconds, thereby increasing the amount of audio information.

FIG. 3 is a schematic diagram illustrating another example of the recording method of the present invention, and unlike the example of FIG. The rest is the same as the example shown in FIG.

FIG. 4 shows the frequency spectrum of recorded information recorded to have four audio channels in addition to one video channel. The spectrum A of the FM wave of the video signal is equivalent to that shown in FIG. The first and second audio channels each have a main channel and a subchannel. For example, a 47.2KHz subcarrier is subjected to FM processing using a subchannel signal, and this FM wave is superimposed on the corresponding main channel signal to generate these superimposed signals. This allows FM processing to be performed on each of the 2.3MHz and 2.8MHz main carriers. In FIG. 4, B and C are both main carriers, and B ₁ , B ₂ and C ₁ , C ₂ are the first sideband of subcarriers.

A schematic diagram illustrating an example of such a recording system having four audio channels is shown in FIG. Video segment information V _a , V _b , V _c ,
..., V _i , ... are continuously recorded on the video channel in this order, and at the same time video segment information V _a , V _e , V _i , ... and corresponding audio information A _a , A e , ... are recorded on the main channel of the _first channel. Record A _i , ... sequentially and continuously. Also, information on the subchannel
Audio information A _b , A _f , ... corresponding to V _b , V _f , ..., respectively
are recorded in sequence. In the main channel of the second channel, the information V _c , V _g , ... and the corresponding audio information A _c , A _g , ... are sequentially and continuously recorded,
In the subchannel, audio information A _d , Ab , . . . corresponding to information V _d , V _h , _. . . is sequentially recorded. At this time, the starting points of the corresponding image segment information and audio information are both recorded so that they coincide, and as a result, each recording section of the audio information is four times as long as that of the image information, and is 4× 6 = 24 seconds worth of audio information can be recorded.

FIG. 6 is a schematic diagram illustrating another example of the recording method of the present invention, and unlike the example of FIG. 5, the ending points of both the corresponding image segment information and audio information are made to coincide. The rest is the same as the example shown in FIG.

FIG. 7 is a schematic block diagram of a recording apparatus having the two audio channels shown in FIGS. 1-3. The first channel audio carrier (2.3MHz) is continuous audio information A _a ,
FM processing is performed in the modulator 1 by A _c , A _e , A _g , . . . The second channel audio carrier (2.8MHz) provides continuous audio information A _b , A _d , A _f ,...
The signal is subjected to FM processing in the modulator 2. Video segment information V _a , V _b , V _c , . . . , V _g , .

This identification code signal is information that allows the playback side to identify in which of the two audio channels the corresponding audio information accompanying each video segment information is recorded. Inserted at a specific horizontal scan line.

All of these FM waves are superimposed by an adder 5 and passed through a limiter 6 to become a recording signal. At this time, video information V _a , V _b , ... and audio information
The real-time arrangement relationship between A _a , A _b , . . . is edited in advance so that the arrangement is as shown in FIG. 2 or 3, and is input to each modulator.

FIG. 8 is a schematic block diagram of a recording apparatus having the four audio channels shown in FIGS. 4 to 6, and parts equivalent to those in FIG. 7 are designated by the same reference numerals. Two mutually independent subcarriers (47.2KHz) each transmit continuous audio information.
A _b , A _f , ... and A _d , A _h , ... respectively modulate the modulator 7.
and FM processing is performed at 8. These FM waves are used as continuous audio information in adders 9 and 10, respectively.
A _a , A _e , A _i . . . and A _c , Ag , _. . . are superimposed, and both superimposed waves are input to modulators 1 and 2, respectively. In this modulator 1 and 2 there are two main carriers (2.3
and 2.8 MHz) is subjected to FM processing using each superimposed wave, and thereafter undergoes the same signal processing as in the case of FIG. 7 to become a recording signal.

The identification code signal in this case is an information signal indicating one of the four audio channels, and the real-time arrangement relationship between the video segment information and the audio information is as shown in FIG. 5 or 6. Of course, it has been edited in advance.

FIG. 9 is a schematic block diagram of one example of the reproduction method according to the present invention, and is an example of reproducing a recording disk recorded by the method shown in FIGS. 1 to 3. Read by Pickup 11
The RF (high frequency) signal is used to separate the video information band and the first and second channel audio information bands, respectively.
BPF (band pass filter) 12, 13 and 14
are supplied to each. The output of the BPF 12 becomes a video signal in a video detector 15 and becomes a video output via a squelch circuit 16. Also, BPF1
The outputs of 3 and 14 are output to audio detectors 17 and 1.
8 and become audio signals, which are selectively selected by switch 19 and become audio outputs.

The controller 20 detects the identification code signal included in the output of the detector 15,
The squelch circuit 16 is controlled by the output of the controller 20. _The controller 20 inputs image segment information V _a , V _c , _{V e} , _. . .
The squelch circuit 16 is controlled to determine which of the following is selectively reproduced. Furthermore, the controller 20 has a function of determining which of the audio channels corresponding to the reproduced image information is to be selected in accordance with the user command, and the switch 19 is thereby adapted to operate in response.

For example, if the user selects video segment information,
When a command is given to play consecutive groups of V _a , V _c , V _e , V _g , ..., the audio information corresponding to these groups is recorded in the first audio channel, so the audio of this first channel is Switch 19 is controlled to reproduce. At the same time, among the respective identification code signals in the image segment information, the code corresponding to the first audio channel is selectively detected in the controller 20, and when other identification codes are detected, the squelch circuit 16 is used as an oven to generate images unrelated to the reproduced audio. It is designed to squelch the output.

As shown in FIG. 2, the squelch control described above is performed when a recording disc is reproduced in which the starting points of the corresponding image information and audio information both coincide. On the other hand, when reproducing a recording disk in which the end points of both corresponding information coincide as shown in FIG. 3, the following processing operation is performed. When audio information corresponding to certain predetermined image segment information is reproduced, this reproduced audio signal is supplied to a memory or other delay means (not particularly shown), and is output to the memory at the same time as the corresponding image information starts to be reproduced. When the end point of the image information is reached, the playback device is controlled to the still image playback mode, and while still image playback is continued until the end point of the audio information is reached, the remaining playback audio signal is derived from the delay means. All you have to do is output . The transition to the still image reproduction mode is performed by the controller 20.

FIG. 10 is a schematic block diagram of another example of the reproducing method according to the present invention, and is an example of reproducing a recording disc recorded by the method shown in FIGS. Equivalent parts are indicated by the same reference numerals. The signal processing path for image information is the same as in the case of FIG. 9, and its explanation will be omitted. A main channel signal is extracted from the output of the detector 17 of the first audio channel by an LPF (low pass filter) 21 and input to the selector 19, and a subchannel signal included in the output of the detector 17 is separated in the detector 22. Detected selector 19
is input to. Also, the main channel signal is output from the second audio channel detector 18.
A subchannel signal extracted by the LPF 23 and input to the selector 19 and separated and detected by the detector 24 is input to the selector 19 .
The output of this selector 19 is an audio reproduction output, and the selection operation of this selector 19 is controlled by the controller 20, and audio corresponding to the reproduced image information is derived, similar to the example shown in FIG. 9.

FIG. 11 is a schematic block diagram showing another example of the reproduction method of the present invention, and the same parts as those in FIG. 10 are designated by the same reference numerals and the explanation thereof will be omitted. In this example, the selector 19 is adapted to derive the audio reproduction output of the left and right channels, and is applied when stereo audio is recorded on the recording disk. In other words, in the schematic diagrams of Figures 2 and 3, both the first and second channels have a main channel and a sub channel, and stereo information is recorded by these main and sub channels. It is clear that the information recording time is 2×6 seconds.

Furthermore, if the main and sub-channel signals of the first and second channels are subjected to matrix processing such as the conventional SQ method to create a four-channel signal, the audio output of the playback device can be connected to an attached circuit such as an adapter. It is also possible to reproduce substantial 4-channel stereo signals using this method.

The squelch timing of image information is controlled by detecting the identification code in the video signal, but changes in image segment information are detected using the frame correlation of the video signal, and the period during which the same image segment continues ( The squelch operation may be performed for a period slightly longer than 6 seconds). FIG. 12 is a block diagram for squelch control in such a case,
The detected signal from the video detector is sent to a comparator 27 via a 1 frame delayer 25 and an LPF 26.
This is one input. Further, the detected signal is directly inputted to the comparator 27 via the LPF 28, and the correlation between these two inputs is detected by the comparator 27. The LPFs 26 and 28 have time constants set to remove color subcarriers contained in the color video signal. When there is no correlation, MMV (monostable multivibrator)
29 is triggered and outputs a squelch control signal for a certain period of time. In the case of two audio channels, since 2 x 6 = 18 seconds of audio output is obtained, it is necessary to squelch another 6 seconds of images that are unrelated to this audio, and therefore, the single output of MMV29. The purpose can be achieved by setting the time width to be slightly longer than 6 seconds. In the case of 4 audio channels, since 4 x 6 = 24 seconds of audio output is obtained, it is necessary to squelch another 3 x 6 = 18 seconds of images that are unrelated to this audio output. MMV2
It is sufficient to set the time width of the single output of 8 to be slightly longer than 18 seconds.

Yet another method is to make two frequencies in the audible band, ₁ = 1KHz and ₂ = 2KHz, correspond to logic 0 and 1 of a digital signal, respectively, and insert this digital signal in a specific pattern into the audio information channel. Of course, it is also possible to record the video information and squelch the video information in response to the detection of this specific pattern.

As described above, the present invention has the advantage that it is possible to create a file of image information with audio explanations without requiring any special equipment, resulting in a low-cost recording and reproducing system.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the frequency spectrum of a recording disk having two audio channels, FIGS. 2 and 3 are schematic diagrams showing each example of the recording method of the present invention, and FIG. 4 is a diagram showing a recording disk having four audio channels. FIGS. 5 and 6 are schematic diagrams showing other examples of the recording method of the present invention; FIGS. 7 and 8 are schematic block diagrams of the recording method of the present invention; 9 to 11 are schematic block diagrams of the reproduction method of the present invention, and FIG.
The figure is a block diagram for squelch control. Explanation of the symbols of the main parts, 1, 2, 4, 7, 8...
Modulator, 12, 13, 14... BPF, 15, 17,
18, 22, 24...detector, 16...squelch circuit, 20...controller.

Claims (1)

[Claims] 1. A recording system that records multiple information by having one video channel and n audio channels (n is an integer of 2 or more),
A plurality of image segment information is continuously recorded on the one video channel, and n audio information corresponding to each of the n arbitrary continuously recorded image segment information is allocated and recorded to the n audio channels, respectively. A recording method characterized in that recording is performed such that each recording section of the n pieces of audio information is approximately equal to a total recording section of the n pieces of image segment information. 2. The recording method according to claim 1, wherein the image segment information and the corresponding audio information are recorded so that the start point or end point of each recording section coincides with each other. 3. The first aspect of the present invention is characterized in that identification code information for uniquely associating each piece of image segment information with an audio channel in which audio information corresponding to the image segment information is recorded is also recorded. Recording method described in paragraph or paragraph 2. 4. having one video channel and n audio channels and continuously recording a plurality of image segment information on the one video channel;
n pieces of audio information corresponding to n pieces of image segment information recorded continuously are allocated and recorded to the n audio channels, respectively, and each recording section of the n pieces of audio information corresponds to the n pieces of image segment information. A reproduction method for reproducing a recording medium in which segment information is recorded so as to be approximately equal to the entire recording interval,
A playback method characterized in that the playback output of the image segment information unrelated to audio information included in a specific audio channel during playback is squelched. 5. Identification code information for uniquely associating each piece of the image segment information with an audio channel in which audio information corresponding to the image segment information is recorded is recorded on the recording medium, and the identification code information is recorded on the recording medium. Claim 4, characterized in that the information is detected and the reproduction output of the image segment information is squelched.
Playback method described in section. 6. The image segment information and the audio information corresponding thereto are recorded so that the end points of each recording section coincide with each other, and the reproduction signal of the audio information corresponding to the predetermined image segment information is delayed to reproduce the audio information. The predetermined image segment information is outputted at the same time as the playback starts, and when the end point of the predetermined image segment information is reached, the still image playback mode is set and the remaining audio information is continued until the end point of the audio information is played back. A reproduction method according to claim 4 or 5, characterized in that: