JPS59140602A - Recording and reproducing system - Google Patents

Abstract

PURPOSE:To attain filing the picture information with aural captions with a simple constitution by recording continuously plural pieces of picture information, allotting and recording the audio information corresponding to those picture information to audio channels and having equal recording sections between the picture information and sound information. CONSTITUTION:When two audio channels CH are used in addition to a video channel CH, the video segment information Va, b, c... correspond to audio segment information Aa, b, c... respectively. In this case, the coincidence is secured between start points or finish points of segments [diagrams (1) and (2)]. A recording device gives the FM processing to the audio carrier at CH-1 by information Aa, b, c... and at CH-2 by information Ab, d, f... respectively. The video information is continuously supplied to an adder 3 and undergoes the conversion of frequency together with an identification code signal. The identification code identifies the audio CH containing the audio information corresponding to each video information at the reproduction side. These FM waves are added together and turned into recording signals. Both video information Va and audio information Aa are edited previously and fed to each modulator so that the real times are arrayed as shown by (1) or (2) between both types of information.

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 all image information (still images or moving images) with audio explanations of a predetermined length on a video disc as 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 formant signal. .

That is, time-axis compressed audio information is recorded in a predetermined frame section out of a group of N TV frames, video information is recorded in the remaining frame section, and these N frame groups are combined into one frame section. This is configured as segment information.

To play back the entire 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 are disclosed in Japanese Patent Application No. 1984-384'97 (% JP-A-57-152786) filed by the applicant of the present invention.

In the conventional method described above, it is necessary to compress the time axis in order to record the 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. It becomes a factor.

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.

In the recording/playback method according to the present invention, a video disc stores video information and audio information in separate recording channels (
For example, 10 seconds of image information (still images or videos can be used) with an audio explanation can be stored on one side of the disc at 3 times.
00 segment file, the recording time on one side of the disc is approximately 30 minutes (1B00 seconds), so 180
07301) = Only 6 seconds of audio explanation can be added. However, since a disc generally has multiple audio channels, by making good use of these multiple channels, it is possible to add an audio description of 6 x n seconds (rL is the number of audio channels). .

Therefore, the recording method according to the present invention continuously records a plurality of image segment information on a video channel, and records audio information corresponding to arbitrary consecutively recorded image segment information on two audio channels. It is assumed that the audio information is recorded so that each recording section of the audio information is approximately equal to the total recording section of the 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 included in a specific audio channel at the time of playback. It is characterized by what it did.

The present invention will be explained below with reference to 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 slMHz, White Peak Rehelka 93M) Iz, and Cincino Plehelka 7.6M.
The frequency is converted to Hz, resulting in the spectrum shown by A in the figure. B and C are 2.3 and 2.8
Ml(z) indicates an audio carrier, 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 woVa, vb, ■o, ..., ■7. . . ., these are sequentially recorded on the video channel, and at the same time, the audio information N, fi corresponding to the segment information, v, , v, , Vg, . . . -c, A1. , . . . are recorded in sequence. Furthermore, audio information Ab, Act, Af, . . . corresponding to the video segment information Vh, vd, vf, . During this 1st life, each start point of the video segment information is made to match each start point of the audio information corresponding to each of these segment information 1, and as a result, the audio information ~, A, 6. ~． . . . each recording section 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.

Figure 4 shows the entire frequency spectrum of the recorded information recorded in the system, which has 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 and a sub channel, for example 47.2
KHz subcarrier is converted into FM by subchannel signal.
Processing 7. These Fr5A waves are superimposed with the corresponding main channel signals, and these superimposed signals generate 2.3M) (
The main carriers of 2.8 MHz and 2.8 MHz are subjected to FM processing, respectively. In Figure 4, B, C
are both main carriers, B, , B2 and C, ,
C2 is the first sideband based on the subcarrier.

A schematic diagram illustrating an example of such a recording system having four audio channels is shown in FIG. Video segment information Va, ■b, ■o,...

vL +... are continuously recorded in this order on the video channel, and at the same time video segment information V, , V, , VL,... is recorded on the main channel of the first channel.
and corresponding audio information N, A1. Record 戊, . . . sequentially and continuously. -! In addition, information Vb is sent to the subchannel,
■Audio information Ab, Af, corresponding to f,...
... are recorded in sequence. Information V is on the main channel of Nest 2 channel. , Vg, . . . corresponding audio information.

. . , . At this time, the starting points of both the corresponding picture segment information and audio information are recorded so that they coincide, and as a result, each recording section of the audio information has a length four times that of the image information.
Audio information equivalent to X 6 = 24 seconds 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 shown in FIGS. 1 to 3 f? , , is a schematic block diagram of a recording device with two audio channels. Audio carrier of the first channel (2,
3MHz) continuous audio information~l ACIA,,A
, . . . performs FM processing in the modulator l. The audio carrier (28 MHz) of the second channel is subjected to FM processing in the modulator 2 by continuous audio information Ab, Ad, Af, . Video segment information v
, +■b, V, , . . . , Vg, .

This identification code signal is information that allows the playback side to identify in which of both audio channels the corresponding audio information accompanying each video segment information is recorded, and is, for example, a vertical synchronization signal for each video segment information. is inserted at a particular horizontal scan line.

All of these FM waves are superimposed by an adder 5 and then passed through a limiter 6 to become a recording signal.

At this time, the real-time arrangement relationship between the video information 'a + Vb *... and the audio information ~, A, 6°... is as shown in Fig. 2 or 3. It is edited in advance and used as 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 Lv.

Two subcarriers independent of each other (47,2KHz
) is subjected to FM processing in modulators 7 and 8, respectively, into largely continuous audio information Ab, Af, . . . and ~+AJL+ . These FM waves are continuous audio information in adders 9 and 10, respectively.

ke, 'i... and ~, ni! It is superimposed with I,...
Both superimposed waves are input to modulators 1 and 2, respectively. In this modulator 1 and 2, two main carriers (2, 3 and 2
8 MHz) is subjected to FM processing to 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 for 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 reproducing 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. Pick up 11! The read RF (high frequency) signal is passed through a BPF (band pass filter) 12 for separating the video information band, @l and the second channel audio information band, respectively.
．． 13 and 14, respectively. 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, BPF 1
The outputs of signals 3 and 14 are input to audio detectors 17 and 18, respectively, to become audio signals, which are selectively selected by a switch 19, and become audio outputs.

The controller 20 detects the identification code signal included in the output of the detector 15, and the output of the controller 20 controls the squelch times 1@16. The controller 20 outputs image segment information in response to instructions from the user through the input means 21.

V, 5. V, ... or V, 6, V, z, v
The squelch circuit 16 is controlled to determine which one of f, . . . should be 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 this user command.
9 operates in response.

For example, the user may select η out of the video segment information.

vc, ■6. V! When a command is issued to reproduce consecutive groups of I, . . At the same time, among the 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 the identification code is other than that, the squelch circuit 16 is opened and an image unrelated to the reproduced audio is detected. It is designed to squelch the output.

As shown in FIG. 2, the above-mentioned squelch system is used when reproducing a recording disk in which the starting points of corresponding image information and audio information both coincide.

On the other hand, when reproducing a recording disk in which the ending points of both corresponding information coincide as shown in FIG. 3, the following processing operation is performed. When audio information corresponding to a certain predetermined image segment information is reproduced, this reproduced audio signal is supplied to a memory or other delay means (not particularly shown), and the reproduction of the corresponding image segment information is started. At the same time, an audio signal is derived from the memory or the delay means, and when the end point of the image S information is reached, the playback device is controlled to a still image playback mode, and the playback device continues playing the still image until the end point of the audio information is reached. The remaining reproduced audio signal may be 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 disk recorded by the method shown in FIGS. 4 to 6, and FIG. Equivalent parts are indicated by the same reference numerals. The signal processing process for image information is the same as in the case of FIG. 9, and its explanation will be omitted. From the output of the detector 17 of the first audio channel to the main channel signal power LPF' (low pass filter)
The subchannel signals included in the output of the detector 17 are separated and detected by the detector 22 and input to the selector 19 .

Further, a main channel signal is extracted from the output of the second audio channel detector 18 by an LPF 23 and input to the selector 19, and a sub-channel signal subjected to 9-separation detection by the detector 24 is manually inputted to the selector 19. . The output of this selector 19 is an audio playback output, and the selection operation of this selector 19 is controlled by the controller 20 to derive audio corresponding to the playback image information, 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 capable of deriving audio reproduction outputs for left and right channels, and is applied when stereo audio is recorded on a recording disc. 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, and in this case, audio 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 converted to a four-channel signal using an attached circuit such as an adapter. Using this, it is also possible to reproduce virtually all four-channel stereo signals.

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 is controlled. The squelch operation may be performed for a slightly longer period than (6 seconds). FIG. 12 is a block diagram for squelch control in such a case, in which the detected signal from the video detector is passed through the l-frame delayed izs and the LPF 26f to the comparator 27.
Become one-man power. The fc detection signal is directly input to the comparator 27 via the LPF 28, and the comparator 27 detects the correlation between these two inputs.

LPF' 26 and 28 are set at time constants to remove color subcarriers contained in the color video signal. When there is no correlation, the MM'v (mono-staple multipipelator) 29 is triggered and the squelch control 1
Output the i11 signal for a certain period of time. In the case of two audio channels, we have obtained 2X6=18 seconds of audio output; we need to squelch the other 6 seconds of image unrelated to this audio, so the time of single output of MMV 29 Setting the width to slightly longer than 6 seconds will accomplish the purpose. For 4 audio channels, 4X6=
Since 24 seconds of audio output is obtained, it is necessary to squelch other 3 x 6 = 18 seconds of images unrelated to this audio output, and the total time width of MMV 28's single output is 1.
You can set it a little longer than 8 seconds or 9 seconds.

As yet another method, two frequencies f within the audio band,
= IKl (z and f2=2KHz correspond to logic 0 and 1 of the digital signal, respectively, this digital signal is inserted and recorded in the audio information channel in a specific pattern, and in response to the detection of this specific pattern Of course, it is also possible to squelch the video information.

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

[Brief explanation of drawings]

FIG. 1 shows the frequency spectrum of a recording disc with two audio channels; FIGS. 2 and 3 are schematic diagrams showing each side of the recording system of the invention; FIG. 4 shows a frequency spectrum of a recording disc with four audio channels. FIGS. 5 and 6 are schematic diagrams showing other sides 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 system of the present invention, and FIG. 12 is a block diagram for squelch control. Explanation of symbols of main parts 1.2.4.7.8...Modulators 12, 13, 14...BPF'15, 17
, 18, 22,...24...detector 16...
Squelch circuit 20...Controller applicant
Motohiko Fujimura, Patent Attorney, Pioneer Co., Ltd.

Claims (6)

[Claims] (1) A recording method that records multiplexed information by having one video channel and n audio channels (an integer equal to or greater than n742), wherein a plurality of image segment information is recorded on the one video channel. , and allocate and record two pieces of audio information that respectively correspond to n pieces of image segment information that have been continuously recorded, respectively, to the n audio channels, and record each of the pieces of audio information. A recording method characterized in that recording is performed so that the section is approximately equal to the 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 audio information corresponding thereto are recorded so that the start point or end point of each recording section coincides with each other. (3) A claim 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. 1st
Recording method described in paragraph or paragraph 2. (4) It has one video channel and n audio channels, and a plurality of image segment information is continuously recorded in the one video channel, and each corresponds to any n pieces of continuously recorded image segment information. The nine pieces of audio information are allocated and recorded to the n audio channels, respectively, and recorded so that each recording section of the nine pieces of audio information is approximately equal to the total recording section of the n image segment information. 1. A reproduction method for reproducing a recording medium, characterized in that the reproduction output of the image segment information unrelated to audio information included in a specific audio channel at the time of reproduction is entirely squelched. (5) The recording medium records 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. 5. The reproduction method according to claim 4, wherein the reproduction output of the squadron segment information is squelched by detecting the identification code information. (6) The image segment information and the corresponding audio information 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 The still image reproduction mode is configured to delay and output the predetermined image segment information at the same time as the start of reproduction, and when the end point of the predetermined image segment information is reached. 6. The reproduction method according to claim 1, wherein the remaining audio information is reproduced continuously up to the end point of the audio information while closing the audio information.