JPS5853037A - Disc information recording medium - Google Patents

Abstract

PURPOSE:To prevent discontinuity of audio signal, by taking an audio signal of a track before and after, in compulsively changing the track, as the same signal or a non-recording, at the reproduction of a disc recording information. CONSTITUTION:An audio signal from input terminals 1 and 2 is frequency- modulated 6,7 and inputted to a mixing circuit 8. A video signal from a terminal 3 is gated with a pules inputted from an input terminal 4 the same time as a kick control signal at a gate 9, and a signal after a color burst signal beta during one horizontal period is eliminated and mixed 10. The mixing circuit 10 mixes a kick signal alpha from a terminal 5 and inputs the result to mixing circuit 8. The kick signal is inputted at a vertical blanking period of a video signal and as to the audio signal, a track before and after to be kicked is taken as the same signal or non-recording. Thus, the video and audio can be reproduced without discontinuity. This system is suitable in recording questions, answeres and interpretation on a video disc for study.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk-shaped information recording medium, and there is an advantage in recording the same audio signal or silence on the trunk before and after the kick during the kicking period, and there is no artificial sound during the kicking. It is an object of the present invention to provide a disk-shaped information recording medium capable of obtaining normal continuous sound without causing discontinuity.

Generally, a disc-shaped information recording medium (hereinafter referred to as "disc")
If the information signals to be recorded are video signals and audio signals, there will be no problem when the information signals are continuously played back during normal playback of the disc. But 7,
When a kick control signal is recorded together with an information signal to forcibly change the track of all tracks on the reproducing element (hereinafter referred to as "ftr kick" forcibly changing the track odor of one track on the reproducing element), the disc When a kick is performed during reproduction, the information signal is reproduced discontinuously.

If this kick is performed in the vicinity of the vertical blanking period of the video signal, which is located at four locations in one track, which is formed during one rotation of the Nysk, the video obtained from this reproduced video signal will not be disturbed in any way. However, there was a drawback that the audio signal was discontinuous.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

The present invention relates to a disc in which an audio signal is recorded on the same track as a video signal, and as an example, a case where the present invention is applied to a disc previously proposed by the present applicant, 911, will be explained. In this disc proposed by the present applicant, the main information signal is recorded in the spiral main trunk without forming the entire needle guide groove, and the main information signal is recorded at a frequency lower than the recording frequency band of the main information signal. , first and second tracking control reference signals (hereinafter referred to as "tracking signals") f having different frequencies and having a burst shape.
and fp2 are alternately switched every rotation period of the disk to form a sub-track approximately in the middle between the track center lines of adjacent main tracks, and furthermore f and fp2 are recorded. In the switching connection 1 section, the third tracking signal FP5 is distributed to the main and secondary trunks at a level below a predetermined level in order to avoid giving any shadow to the main information signal, and is a disk with an electrode function of 2L. .

Here, an example will be given of a capacitance detection readable disc in which a video signal and two-channel audio signals as the main information signals are recorded as bit strings that are intermittent at a rate of four fields per rotation. Note that the first
The figure is a diagram schematically showing the arrangement relationship of the recording tracking signals of the disc proposed by the present applicant. In the figure, the ○ mark indicates the f11 recording position, the △ mark indicates the fp2ie nail position lt, The solid line indicates the trunk center line of the main trunk, and the third tracking signal fp3 is recorded on the main or sub-track that intersects with the broken line.

Next, to explain the disc according to the present invention, FIG. 2 shows a block system diagram of the main parts of an embodiment of the Ie recording system of the disc according to the present invention. In the figure, audio signals of a first channel and a second channel are respectively input to input terminals 1 and 2. Here, input m child 1. z, monaural audio signals from the same program source arrive at the same time, left channel and right channel stereo audio signals arrive separately, and different types (for example, one is in Japanese). There are cases where the monaural audio signals of the other side (evening, Japanese, etc.) are input separately. Further, 3 is an input terminal for input signals 1' and 1', 4 is an output terminal for input signals, and 5fJ is a kick control type force terminal.

The audio signal of the first channel that enters the input terminal 1 is converted to a predetermined frequency (for example, 143 MHz) by the frequency modulator 6.
The carrier wave is frequency-modulated and becomes the FM audio signal of the first channel. At the same time, the second channel audio signal that enters the input terminal 2 is frequency-modulated by a carrier wave of, for example, 3.43 MHz by the frequency modulator 7, and is converted into a two-channel FM audio signal. The FM audio signals of the first and second channels are respectively supplied to the mixing circuit 8. The video signal that enters the input terminal 3 is gated at the gate 9 by a gate pulse that enters the input terminal 4 at the same time as a kick control signal to be described later.During the tN1 period, the video signal recording period after the color burst signal is removed. This video signal is supplied to the mixing circuit 10, which mixes this video signal with the kick control signal coming from the input terminals 5 and 9, and inserts the kick control signal into the video signal recording period removed above. 7 and supplies it to the mixing circuit 8. In this video mixing circuit 8, the audio signals of the first and second channels are multiplexed, respectively. Here, the video signal input to the input terminal 3 is made so that the band does not overlap with the FM audio signals of the 1st and 2nd channels, and for example, the upper limit frequency is about 3MHz! This is a composite color video signal in which a low frequency band-converted carrier color signal is band-sharing multiplexed into the high frequency region of a band-limited brightness signal.

In addition, the output control signal µ, for example, a 5OOkHz burst signal, is mixed with the 19 video signal in the mixing circuit 10 as shown in Fig. 3.
The waveform will be as shown in . In Fig. 3, ω is the αμ horizontal synchronizing signal, and β is the color burst signal.

r is the middle lock control Xl signal. The kick control signal is composed of 5 bits Lv, and the first bit r indicates the presence or absence of a kick. When n is "1" (recorded), a middle kick is performed, and "O" (recorded do not kick when The second bit γ2 represents the kick mode, r
oOJ, r01J', rloJ, rlIJ
The first to fourth modes shown in can be specified. 5th bit r5
indicates the number of kicks, and when the first bit is "1", the fifth bit is one kick (the reproducing element moves one track), and when the fifth bit is "1", it is kicked twice. is instructing.

The multiplexed signal taken out from the mixing circuit 8 shown in FIG.
Frequency carrier m with carrier shift bandwidth from 2 to 7.9 MHz
The output terminal 11 outputs the wave as a main information signal.

The main information signal is applied to, for example, an optical modulator (not shown) to modulate a laser beam and convert it into a modulated optical beam.
, this is applied onto a disk-shaped recording master disk that rotates synchronously.
The main trunk is formed by concentrating the light onto a photosensitive material and then passing through a well-known processing process to form a bit string that is intermittent in accordance with the repetition frequency of the main information signal. Therefore, the video signal and the two-channel audio signal are simultaneously recorded on the same main track. Incidentally, after the laser beam applied to the tracking beam is similarly modulated and converted into a modulated light beam, a front sub-track of an intermittent bit string is formed at the same time as the main trunk. A disc is duplicated from the original recording disc through a well-known locking process.

FIG. 4 schematically shows the information signal arrangement of one embodiment of the disc of the present invention. In the figure, the main information signal is recorded on the spiral shown by the solid line, and the position shown by the broken line is the vertical synchronization signal recording position of the video signal in the main information signal. For example, on the spiral from point a to point A on this disk (hereinafter referred to as section abJ), a certain problem is posed and the answer is t A e
A township program to choose from three BIO programs has been recorded.

Corresponding to this program, the interval be a at? Next, a program is recorded that provides an explanation when the answer is m, and similarly, sections atl and fg provide an explanation when the answer is Bt-1, and section de and gh provide an explanation when the answer is cl. The program is distributed.

Following this, a program that poses the next problem is recorded on the inner circumferential side of the dot. At the same time, the second point instructs to kick twice to the inner circumference side in the third mode of point bVCti.
As shown in Figure ω), a kick control signal [10toIJ has not been recorded, and at point 1, a kick control signal rLOOloJ that instructs one kick to the inner circle in the second mode has been recorded. Similarly, at point c S-f, a middle vine control signal instructing to kick twice to the inner circumference in the first mode, second mode, third mode, and first mode, respectively, is sent to point g.
In the Ka second mode, there is a kick control signal that instructs to kick once to the inner circumferential side.

Here, the audio signal is continuous for each program described above, but the audio signal is discontinuous during the period when a kick is performed, for example, immediately after the kick control signal when the kick is performed. In order to avoid this, section bb" and section d (1' are the same audio signal, for example, silence (no audio signal is recorded) and 9, and corresponding to the kick control signal at point 1, section bb" is used. Since ' and section cc' are the same audio signal, section ccI is also silent.

Furthermore, for the same reason, the Eri interval bt)' e QC' @
(1(1' s 6(!'@ff'曾ggl-hh'
Everything is silent.

FIG. 5 shows a block diagram of a reproducing apparatus for reproducing disc V of the present invention. In the figure, a high frequency signal (recorded signal) read from a disk 15 rotating at high speed by a reproducing needle 16 is sent to a preamplifier 17.
s, fp, detector 111° tracking circuit 20
are supplied to each of them. The demodulation circuit 1 reproduces the frequency modulated wave reproduced from the main track and the main information signal, and outputs the same through an output terminal 21 and supplies it to the kick control signal detector 22. At the same time, the reproduced signal includes a tracking signal f reproduced from the main track, a trunking signal f reproduced from the sub-track, a trunking signal reproduced according to the direction and amount of tracking. f and/or f12 respectively include tn1 and 4?, of which fp5 is envelope detected after frequency selection by the detector 11, and on the other hand, Zpl m
fp2 is subjected to envelope detection after being selected by the tracking circuit 20, and its detection output is level-compared by a differential amplifier. fp, the output fp of the detector 19, and the detection signal are supplied to the tracking circuit 20, fL, and input to the differential amplifier.The detection output of f1*f,2 is alternately switched every rotation period of the disk 15. used for
Ru.

The kick control signal detector 22 extracts this signal for a period during which a 5-bit kick control signal should be recorded based on the horizontal synchronizing pulse of the signal in the reproduced main information signal, selects the frequency, and then wraps it. The direction of the kick and the number of kicks are determined for each mode by detecting the route, and a signal for controlling the kick pulse generator 23 is generated for each mode. s second
The mode is supplied to the terminal 24b, the third mode is supplied to the terminal 24C1, and the fourth mode is supplied to the terminal 241. In addition, the terminal 24e of the switch 24 is connected to the input terminal 25 so that the operator can
A control signal for performing special reproduction such as normal playback and still playback 1 borrowed speed playback is supplied, and the terminal 24f is switched by the operator so that any one of the terminals 24a to 24e is connected to the terminal 24f. n, terminals 24a to 24.
The control signal of the control signal is supplied to the kick pulse generator 23. The pulse generator 23 kicks the playback needle 16 toward the inner or outer circumference of the disk 15 based on the control signal. Generates a middle pulse, then: rt'j
The i''h racket/circuit 20° is supplied to the tracking coil 27 through the drive circuit 26. As a result, the reproducing needle 16 moves one or two times in the inner circumferential direction or outer circumferential direction of the disk 15.
It is forcibly moved by the track pitch.

When playing the disk tube of the present invention shown in FIG. 4 using the playback device shown in FIG.
and 24. Operate so that f is connected, and when answering B, connect terminals 241) and 24f, and when answering O, connect terminals 24c
and 24f. Here, for example, A
If the terminals 24a and 24f of the switch 10 are connected in response to ', the regeneration needle 16 will be eli-kicked to the kick control signal at point C and will be in the interval C.

ef is played continuously, and a program explaining the answer to A is played. At this time, a kick is performed at point C and point f, but the interval cc', the interval as', and the interval f:
Since f' and section hh' are the same audio signal (silence in this case), the played audio signal will not become discontinuous due to kicking.

In the above embodiment, the kick is performed during the vertical blanking period, but the kick may be performed at a location other than the vertical blanking period.However, in this case, at least the kicking period is at least as long as before the regenerating needle is transferred. The same audio signal must be recorded on the truck and the transferred truck.
Must be.

Note that the present invention is particularly suitable for application to a disk that does not have a needle guide groove and has an electrode function, which was previously proposed by the present applicant, and a reproduction method for the same. The present invention can also be applied to discs that are played back using systems and their playback methods.

The invention is not limited to the above embodiments.

As described above, the disc-shaped information recording medium according to the present invention at least records the audio signals of the tracks tracked by the reproducing element before and after the trunk change during a period in which the reproducing element that reads and reproduces the information signal is forced to change the trunk. Because both are recorded as the same or both as silent, the playback needle is forcibly changed to the trunk when special playback is performed, and the audio signal does not become discontinuous, making it possible to obtain normal continuous sound. It is something.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the recording arrangement of tracking signals in a disk-shaped information recording medium previously submitted by the applicant, and FIG. 2 is an implementation of the recording system of the disk-shaped information recording medium according to the present invention. Block system diagram showing the main parts of the example, Figure 3 ω,
(B) is a waveform diagram of a kick control signal recorded on the disc-shaped information recording medium of the present invention, and FIG. 4 is an information signal recording arrangement of one embodiment of the disc-shaped information recording medium of the present invention. FIG. 5 is a block system diagram showing an example of a reproducing apparatus for reproducing a disc-shaped information recording medium according to the present invention. 01.2...Audio signal input terminal, 3... Video signal input terminal, 4... Gate pulse input terminal, 5... Kick control signal input terminal, 6. γ, 11...Frequency modulator, a, tO...Mixing circuit, 9...Gate, 11
... Output terminal, 15... Disk, 16... Playback needle, 20... Tracking circuit, 22... Middle kick control signal detector, 23... Kick pulse generator, 24...
...Switch, 26...Drive circuit, 27...Tracking coil. 1st EIA Figure 2 Figure 3

Claims (1)

[Claims] In a disc-shaped information recording medium in which a video signal and an audio signal are recorded as information signals in a spiral or concentric manner, at least a period during which a reproducing element that reads and reproduces the information signal is forcibly changed tracks is reproduced. 1. A disk-shaped information recording medium characterized in that the audio signals of the trunk before and after the track change tracked by the element are both recorded as the same or both as silent.