JPS6028080A - Reproducer for information recording disk - Google Patents

Abstract

PURPOSE:To switch optionally and instantaneously >=3 recording programs for reproduction by generating a prescribed kick pulse in response to the difference between a reproduction program number and a program number which is under reproduction. CONSTITUTION:The information signals of >=2 different programs are switched successively and in time series to an information recording disk 1 for each field of the value less than plural fields which are recorded every rotation respectively. At the same time, an address signal containing the codes showing the kicking position and the kicking direction of a reproduction element 2 in a normal reproduction mode and the codes showing program numbers is recorded within a vertical blanking period of each track. In a reproduction mode of the disk 1 the difference is calculated 13 between a program number N and a program number M which is obtained from the reproduction output of an address signal and under reproduction. Then the kick pulses are produced 12 with the polarity corresponding to the positive or negative value of the result of calculation 13 and also in the number corresponding to said number.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reproducing device for an information recording disk, and in particular, an information signal including at least a video signal relating to two or more different programs is switched in field units of one rotation period or less. The present invention relates to a reproducing device for reproducing an information recording disc on which information is sequentially recorded in chronological order.

BACKGROUND OF THE INVENTION Information recording discs such as video discs can be used for a variety of purposes, but they are sometimes used to arbitrarily select and play back one of a plurality of programs during playback. . - For example, when using an information recording disk in a simulation game such as tennis or baseball, the direction of the ball after the server serves it, the receiver's
Any one of several outcomes or processes at the same time in the course of the game, such as the direction of the ball when it is hit back by the pitcher, the course of the ball thrown by the pitcher, or the flight direction of the ball hit by the batter. You may need to quickly select and play the file. In such cases, conventional information recording disks record image information (programs) of multiple selected results or processes in separate blocks, and it is possible to select any - image information using a random access search. and was playing it. However, the surge time due to the random access described above takes about one second at the shortest, which has the disadvantage of detracting from the enjoyment of the game.

Therefore, the present inventor previously proposed in Japanese Patent Application No. 57-34615 an information recording disk that eliminates the above-mentioned drawbacks.

This proposed information recording disk is an information recording disk in which information signals including at least a video signal are recorded at a rate of multiple fields per rotation, and the information signals of two or more different programs are each equal to the above multiple fields. or smaller values are switched in field units and recorded sequentially in chronological order. This information recording disk obtains normal playback images and normal playback audio by forcibly changing the track (hereinafter also referred to as "kick j") by moving the playback needle in the track width direction during continuous playback of the - program game. Furthermore, by suspending the forcible change of the track described above, it is possible to instantly shift to another program and obtain normally reproduced images and normally reproduced audio of that program.

As a result, when used for a game, the game can be played in real time without losing interest in the game.

Problems to be Solved by the Invention However, as a means of instantaneously transitioning from the program currently being played to another program during playback of the information recording disk proposed above, it is possible to pause the kick as described above. Therefore, it is only possible to switch to another program recorded on the information recording disc after the program currently being played. Therefore, if there are three or more recorded programs, the program can be switched to any program instantly. There was a problem in that switching playback was not possible.

Therefore, the present invention provides a method for determining the difference between the program number currently being played and the program number to be switched and played among the program numbers assigned to each of two or more different programs recorded on the information recording disc in the recording order. By controlling the generation circuit of the pulse (kick pulse) for kicking the reproducing element based on the value of
It is an object of the present invention to provide an information recording disk reproducing device that solves the above problems.

Means for Solving the Problems The present invention provides that an information signal including at least a video signal is recorded at the same rate of a plurality of fields per rotation, and the information signals of two or more different programs are recorded in the same manner as described above. Forced playback track during normal playback of a playback element that is switched in field units with values equal to or smaller than multiple fields and sequentially recorded in time series, and that picks up and plays back already recorded information signals. Reproduction for reproducing an information recording disk in which an address signal indicating a change position and change direction and indicating a program number assigned in advance in the recording order of the recording program is recorded within at least a negative vertical blanking period of each track. The apparatus includes: a transfer means for forcibly changing the reproduction track of the reproduction element; a demodulation means for demodulating the reproduction signal extracted from the reproduction element into the original information signal; an address reproducing circuit for reproducing the address signal from the reproduced signal; an input means for inputting a program number of a program to be normally reproduced; Calculates the value of the difference from the program number M, generates kick pulses with a polarity according to the positive or negative of the calculated value and a number of kick pulses according to the calculated value, and when the calculated value is zero, the playback address The device is constructed of a means for generating a kick pulse (generating a kick pulse of '1 and outputting it to the transfer means) according to an instruction code in a signal, and an embodiment thereof will be described below with reference to the drawings.

Embodiment The information recording disk to be reproduced by the reproduction HH of the present invention is as follows:
Information signals consisting of video signals and audio signals of multiple channels are recorded on the same track at a rate of multiple fields per rotation.
First, a case where the invention is applied to the information recording circle 13 proposed in No. 34615 will be explained. Since the recording system of this information recording disk is well known, a detailed explanation thereof will be omitted. For example, a luminance signal and a carrier color signal are separated from an NTSC color television signal, and the luminance signal has an upper limit frequency. Band-limited to about 3.1 MHz, the carrier color signal is frequency-converted to a low frequency so that the color subcarrier frequency is about 2.56 MHz, and both signals are band-sharing multiplexed.

On the other hand, the audio signal is recorded in two channels, but the audio signal of the first channel and the audio signal of the second channel are each supplied to separate frequency modulators, and the audio signal of 3.43 Ml-1z
, 3,73 Mf-1z carrier waves are frequency modulated (F
M) After the signal is converted into an FM audio signal, it is frequency-division multiplexed to the above band-sharing multiplexed color video signal.

FIG. 1 shows an example of the frequency spectrum of this frequency division multiplexed signal, where Y is the band-limited luminance signal, C is the low-pass converted carrier chrominance signal, and ALJ+ and AU2 are the first . The frequency spectrum of the FM audio signal of the second channel is shown. The frequency division multiplexed signal having this frequency spectrum is further supplied to a frequency modulator to produce an FM signal having a frequency spectrum as shown in FIG. In Figure 2, ■ indicates the carrier wave shift frequency band of 2.3 MHz of the frequency-modulated luminance signal, fa is the frequency of 6, 1 MHz corresponding to the sync chip, fl) is the frequency of 6,1 MHz corresponding to the sync chip, and fl) is the frequency of A corresponding frequency of 6.6 MHz, [C indicates a frequency of 7.9 MHz corresponding to a white beak.

Further, TrL and IIu indicate the lower sideband and upper sideband of the frequency-modulated luminance signal, and IIIL and I[[U are the FM audio signals FAI indicated by AU+ and AU2 in FIG.

The lower sideband and upper sideband of a signal obtained by further frequency modulating fA2 are shown. Iv is the FM audio signal fA+ of the above two channels
, fA2 carrier wave 3,43 MHz.

3.73M1-(indicates z.

Further, in FIG. 2, vl indicates the frequency band of a low-pass converted carrier color signal obtained by low-pass converting the carrier color signal (same as the frequency band shown by C in FIG. 1). Also, the first sidebands generated by frequency modulating this low-pass conversion carrier color signal are VI+-, VIu, and the second sidebands are ■L-, Vf
Each is indicated by J.

” The FM signal having the above frequency spectrum is used as fast first and second tracking control reference signals (hereinafter “
a signal fp inserted as an index signal in the switching connection of rp+ and fP2 (referred to as "tracking signal");
3 (indicated by fP3 in FIG. 2) is supplied to the optical modulator of the rear cylinder 1, which is frequency division multiplexed into an empty low frequency region. On the other hand, the FM signals in FIG.
The first and second racking signals fPI and fP2 of the frequency spectrum indicated by p2 correspond to one of the information recording disks, respectively.
A signal that is alternately switched every rotation period and synthesized in time series is supplied to the second optical modulator.

1st. The first and second modulated laser beams extracted from the second optical modulator are applied to the photosensitizer on the disc-shaped recording master by 1/2.
They are focused at a distance of about a track pitch.

The exposed recording master disk is then subjected to a known development process and an annealing process, respectively, to produce an information recording disk having an electrode function and a track pattern as schematically shown in FIG. 3 without needle guide grooves. to be reproduced by humans.

In FIG. 3, an information signal consisting of a color video signal and a two-channel audio signal is recorded in a spiral shape shown by a solid line at a rate of 4 fields per -rotation.
A dragging signal rp+ is recorded on one side of the track as indicated by a circle mark, and a tracking signal fP2 is recorded on the other side as indicated by an X mark. Further, a to d indicate the vertical blanking period recording portions at four locations corresponding to -rotation, and the index signal fP3 is recorded in the vertical blanking period recording portion a where the tracking signals rp+ and fP2 are alternately switched for each rotation. For example, it is recorded for a period of 31-1. Since the tracking signals fPl and fρ2 are switched to alternating current U every rotation and recorded, the tracking signals @fp+ are recorded on the information recording track as shown in FIG.
, fp2 are recorded on each track (every rotation).

A signal with a frequency spectrum shown by a solid line in FIG. 2 is recorded on the information recording disk. Note that during a specific period within the vertical blanking period, an address signal for random access is recorded superimposed on the video signal.

In the information recording disc proposed by the applicant mentioned above, 2
The information signals of the different programs mentioned above are switched in units of four fields or smaller fields and are sequentially recorded in time series.

FIGS. 4 and 5 each schematically show the program recording arrangement and reproduction time of eight examples of information recording discs to be reproduced by the reproduction apparatus of the present invention. In Figure 4, A+, B+ on the vertical axis
, C+, D+, E+, A2,...

A ID indicates one field recording section of five programs indicated by alphabets A to E, respectively.

That is, in FIGS. 4 and 5, the same alphabet indicates the same program, and the subscript indicates the field order. Further, the upward direction of the assembly axis in FIGS. 4 and 5 indicates the inner peripheral direction of the disk. Therefore, the information recording disk with the program recording arrangement shown in FIG.
go→..., the information signals of one field period of each of the five programs A to F are chronologically synthesized and recorded in field order every four field periods. Note that in FIGS. 4 and 5, rp3 indicates the recording position of the index signal fP3 described above.

Furthermore, the information recording disk with the program recording arrangement shown in FIG.
The information signals for one field period of each of the three programs A to C are sequentially switched cyclically for two fields at a time as follows: B2→C1→C2→A3→A4→...C8→... are synthesized and recorded.

Further, on the information recording disk to be reproduced by the device of the present invention, 1.
Playback 1 of playback needle 2 when playing that disc normally
An address signal having a code indicating the forced change position (kick position) and change direction of the rack, and a code indicating a program number pre-assigned in the recording order of the recording program is sent to each of the four vertical positions of the rack. It is recorded in at least one location of the blanking period recording portion. Here, the address signal is composed of, for example, 29 bits, and is recorded in a superimposed manner within a specific 1H period after the vertical synchronization signal within the vertical blanking period, and is recorded in the kick direction within the specified 1H period. The code indicating the kick position is a 4-bit kick presence/absence instruction code and
It can be configured with a bit kick direction code. The value of the MSB of each of the kick presence/absence instruction code and the kick direction instruction code indicates the presence/absence and direction of a kick in the vertical blanking period recording section shown in FIG. 3rd bit and 4th bit (LS
B) are the vertical blanking period recording portions c, d, and d of FIG. 3, respectively.
It shows the presence or absence and direction of a kick at position a.

Further, the code indicating the program number in the address signal is composed of, for example, 4 bits, and indicates the program number of the program to be recorded next to the address signal. This program number t is a numerical value assigned to each of two or more different programs recorded on the information recording disk in the recording order, for example, five programs A,
B.C.

As shown on the vertical axis in FIG. 4, D and [ are switched every one field period, △-→B→C-+D-+E→A→...
- In the case of a disc recorded in the following order, program A is [0'', B is Ml, C is r2'', D71)\r3,1.
A value where E is "4" is assigned as the program number \-.

The kick position of the regenerator 2, which will be described later, is immediately after reproducing the vertical synchronization signal during the vertical blanking period, and immediately before reproducing the address signal for random access such as the above address signal or time address No. 18. The playback device is configured such that the kick is performed at the position.

Next, the information recording disc reproducing apparatus according to the present invention will be explained. FIG. 6 shows a block diagram of an embodiment of the reproducing apparatus of the present invention. In the same figure, it has a pattern of 1 to 1 as shown in FIG.
They are rotated synchronously with OOrpHl. The reproducing needle 2 viscously scans the information recording disk 1. The reproducing meter 2 includes a resonant circuit whose resonant frequency changes in response to changes in capacitance formed between an electrode fixed by vapor deposition on the rear end surface and the information recording disk 1 in accordance with an intermittent bit string; A circuit that applies a constant frequency to this resonant circuit, a circuit that detects the amplitude of the high frequency signal from the resonant circuit whose amplitude changes according to the change in capacitance, and a circuit that detects the amplitude of the high frequency signal that changes in amplitude according to the change in the capacitance. The high-frequency reproduction signal taken out from the pickup circuit 3 consisting of a preamplification circuit is supplied to the demodulation circuit 4, where it is FM demodulated and main information signals (here, a video signal and an FM audio signal) are taken out. On the other hand, a portion is branched and supplied to the fP3 detector 5 and bandpass filters 6 and 7, respectively.

The fps detector 5 selects the frequency of the signal fP from among the reproduced signals, and applies an fp3 detection signal phase-synchronized thereto to the switching pulse generator 8 at generation 1. Further, the bandpass filter 6 selects the frequency of the first tracking signal fPl from the reproduced signal and applies it to the first input terminal of the switching circuit 9.
selects the frequency of the second tracking signal fp2 from the reproduced signal and applies it to the second input terminal of the switching circuit 9. The switching circuit 9 is switched by a switching pulse from the switching pulse generator 8. For example, during a period when the switching pulse is at a high level, each output terminal of the bandpass filter 6.7 is connected to the detection circuit 1.
On the other hand, between 1111 and 1111 at low level, each output terminal of the bandpass filter 6.7 is separately connected to each input terminal of the detection circuit 11.10.

The switching pulse from the switching pulse generator 8 and the kick pulse from the kick pulse generator 12 are changed in polarity and cycle in response to the reproduction mode signal inputted through the comparator circuit 13. A detection signal from the detector 5 or a kick pulse to the tracking circuit 15 (excluding kick pulses that enter during the fp3 reproduction period).

), the polarity of the switching pulse is reversed. In this way, the envelope detection output of the tracking signal reproduced from the sub-track on the outer circumferential side of the main track to be reproduced is extracted from the detection circuit 10, and
The detection circuit 11 takes out the envelope detection output of the l.racking signal reproduced from the inner sub-track and applies it to the differential amplifier 14 at the next stage. A tracking error signal having a polarity corresponding to the direction of track deviation and a level corresponding to the amount of track deviation is taken out from the differential amplifier 14, and this tracking error signal is used for the required driving by the tracking circuit 15 including a drive circuit etc. After being converted into electric power, it is applied to the tracking coil 16, thereby reproducing '! The needle tip of I2 is displaced in the direction and displacement amount to correct the radial upward track deviation of the information recording disk.

On the other hand, the adapter 17 includes an operation button 18 and a memory 19. The operation button 18 is used to select the five different programs A-
The output signal is supplied to the memory 19 by an operation button for selecting an arbitrary - program from E. The memory 19 reads out an address signal indicating the program number corresponding to the - program selected by the operation button 18 and supplies it to the memory 20. The memory 20 stores data from the memory 19 and supplies it to the comparison calculation circuit 13.

On the other hand, the signal demodulated by the demodulation circuit 4 is sent to the output terminal 2.
The signal is supplied to an information signal processing circuit (not shown) at a stage subsequent to 1, and is supplied to an address reproduction circuit 22, respectively. This address reproducing circuit 22 reproduces an address signal having the above-mentioned program number code etc., which is recorded in advance in a predetermined 11'' period within the vertical blanking period of the color television signal, and also reproduces the address signal having the program number code etc. , detector 5
This circuit counts whether or not the vertical synchronization signal has been reproduced after the first detection signal is received.

The comparison calculation circuit 13 calculates and outputs the difference value between the program number N from the memory 20 and the program number M currently being reproduced from the address reproduction circuit 22, and when the difference value is zero, the above value in the reproduction address signal is output. Control pulses are output at the timing and polarity specified by the kick presence/absence instruction code and the kick direction instruction code, and are output to the switching pulse generator 8 and the kick pulse generator 12. As a result, the polarity of the switching pulse is reversed each time this control pulse arrives, and a kick pulse for the inner circumferential direction or a kick pulse for the outer circumferential direction is generated depending on the polarity of the control pulse and the input timing. The needle 2 draws a predetermined scanning locus according to the kick presence/absence instruction code and the kick direction instruction code, and normally reproduces the input program.

Thus, for example, when the information recording disc 1 is an information recording disc on which five programs A to E shown on the vertical axis in FIG. To kick the playback needle 2 in the inner circumferential direction each time the vertical blanking period recording portions a, b, c, and d at four locations per rotation are played back, so as to draw a scanning locus during double-speed playback. A kick pulse is generated, and in synchronization with this, switching pulses are generated for reversing the tracking polarity in three vertical blanking period recording sections, except for the vertical blanking period recording section a, c, and d. be done. On the information recording disk of the program recording arrangement shown on the vertical axis in FIG. 4, five programs Δ to F are recorded divided by one field for every five fields, so the scanning locus shown in FIG. By drawing the reproducer 12, a normally reproduced image and further a normally reproduced sound of program - out of the five programs A to F are obtained.

Here, by using the operation button 18, it is set which track position on the information recording disk the scanning locus shown in FIG. As a result, any one of the programs A to F is reproduced.

Here, when the scanning locus shown in FIG. 7 is drawn, the reproduction time when normal reproduction is performed is as shown on the horizontal axis of FIG. 4. In Figure 4, the thin solid line shows the change in the playback time of program A, the broken line shows the change in the playback time of program B, the thick solid line shows the change in the playback time of program C, the parallel line shows the change in the playback time of program E, and the parallel line shows the change in the playback time of program E. Show each.

Similarly, when normal playback is performed on an information recording disk with the program arrangement shown on the vertical axis in FIG. 5, play! 12 is the 8th
It is recorded by drawing the scanning locus during 3x speed playback in the conventional forward direction, in which after 2-field playback as shown by the solid line in the figure, a kick is performed in the inner circumferential direction during the vertical blanking period recording portion a or C. It is possible to obtain normal playback images and even normal playback audio of any one of the three programs A to C. The horizontal axis in FIG. 5 shows the playback time at this time, and the solid line is the playback time of program A.
The broken line schematically shows the playback time of program B, and the two parallel lines schematically show the changes in the playback time of program C.

Normally, if the number of programs recorded on the information recording disk is Z, then the information signals for each one field period recorded in the radial direction of one adjacent track (
For example, in the disk with the program recording arrangement shown on the vertical axis in FIG. 4, As, 84.

C3, D2, and El; or As, Ba
.

C7, Ds, and E5, etc., and A4, B2 for the disk with the program recording arrangement shown on the vertical axis of FIG.

and C4; or A7, B5. and 03, etc.) are information signals that are arbitrarily switched and reproduced as described later in the same reproduction time.

Further, in FIG. 6, the comparison calculation circuit 13 and the kick pulse generator 12 may be constructed by a microcomputer 23.

Next, during normal playback of the − program,
The operation when instantly transitioning to another program and obtaining normal playback images and normal playback audio of that program will be described. First, the first method is to pause the kick at the position where the playback meter 2 should be kicked during normal playback of the - program, and then kick it in the original sequence when playing the next vertical blanking period. This is a method of doing this. For example, when playing a disc with the program arrangement shown in FIG. 4, the information signal Δ at the bottom is
When the kick of the reproducing meter 2 is stopped within the recording portion of the vertical blanking period immediately after reproducing the information signal A5, the reproducing meter 2 reproduces the information signal A5.
The information signal B5 of the fifth one-field period of program B recorded next to the program B starts to be reproduced. Then, by generating a kick pulse again from the vertical blanking period recorded portion C immediately after reproducing the information signal B5 so as to draw the scanning locus shown in FIG. are played in the order of B6→B7→B8→B9→... In other words, in the above case, the pause in the kick instantly changes the program from normal playback to 85.
It is then possible to proceed to normal playback of program B.

In addition, in the second method and the first method of performing program switching playback, the program number M of the program currently being played is
and the program number N of another program for which switching playback is attempted, the value of the difference between them (N-M)
There is a method to generate a number of kick pulses depending on the number of kick pulses.

In this case, the address reproduction circuit 22 reproduces the kick address signal described above, and outputs the value of the program number code therein to the comparison calculation circuit 13 as the program number M currently being reproduced. Further, when the comparison calculation circuit 13 and the kick pulse generator 12 are each constructed by a microcomputer 23, the operation shown in FIG. 9 is performed. In FIG. 9, when the operator operates the operation button 18 to set a program number N for which switching playback is requested, the microcomputer 23 is stored in the memory]9 in step S-1.
This program number N that comes through ゜20 respectively
Then, in step S-2, the program number M currently being reproduced is input from the address reproduction circuit 22. Then, in the next step S-3, the microcomputer 23 calculates the difference (N-M) between the progera 11 numbers N and M, and if the value is negative, the microcomputer 23 moves toward the inner circumference in step S-4. Kick pulse that kicks playback 112 (M
-N) kick pulses are generated, and when the value of (NM) is positive, in step S-5, (NM) kick pulses are generated to kick the regeneration needle 2 in the outer circumferential direction. As a result, the reproducing needle 2 is moved by a track pitch corresponding to the value of the difference (NM), and is also moved in a direction depending on the sign of the value of the difference (NM).

For example, the program recording sequence of disk 1 to be played is the fourth one.
As shown on the vertical axis of the figure, five programs A to F are executed every field period A-+B-C-)D->E-→A-ν...
・When recording is performed from the outer circumference to the inner circumference of the disk in the following order, as described above. The program number to the program is rOJ, B is 1j, C4 is r2J, D is r3J,
E is "4". Then, recording program C on this disc is being played back normally, and one field period is C6.
At the time of playback, press operation button 1 to switch and play program A.
8 is operated, the microcomputer 23
is recorded in the vertical blanking period recording portion a to identify that the program number M currently being reproduced is "2" (ie, program C) at the time when the kick address signal (X) is reproduced. After that, since the program requesting switching reproduction is A and the value of the program number N is rOJ, the microcomputer 23
calculates the difference (N-M) value "-2" and then generates two kick pulses for the inner circumferential direction. As a result, the reproducing needle 2 is kicked in the inner circumferential direction by two track pitches and starts reproducing 9 of the information signal for one field period of program A. Thereafter, the reproducing needle 2 starts reproducing program A according to the scanning locus shown in FIG. Reproduce. In this way, it is possible to instantly switch and reproduce from program C to program A.

As another example, if you switch to play program E while playing program B, the value of the difference (N-M) in this case will be "3", so the playback total will be 2. will be kicked three track pitches toward the outer periphery. Switching and reproduction can be performed in the same manner in other cases.

By the way, in the recording part of the vertical blanking period in one place during normal playback, the present applicant had previously disclosed
If kicking is performed by two or more track pitches as proposed in No. 70 and Japanese Patent Laid-Open No. 58-19771, six or more programs can be recorded in a distributed manner.

For example, as shown by the solid line in FIG. 10, if the playback needle 2 is to draw a scanning locus that kicks two track pitches in each of the vertical blanking period recorded portions a, b, c, and d, nine The program can be recorded by dispersing it into nine fields, one field at a time.

Therefore, if K is the maximum number of programs recorded on a disc in which color television signals are recorded at the rate of 4 fields per revolution, K is expressed by the following equation.

K= (4,/n) +1 (1) However, in formula (1), n indicates the number of fields played from one kick position to the next kick position, and 4,/n
n is an integer. Therefore, n is 1,2.4°0.8.
0.5. 0.4. It can take values such as 0.25 and 0.2.

APPLICATION EXAMPLE The above description has been given of a case in which the present invention is applied to an information recording disk proposed by the present applicant, but the present invention is not limited to this, and the present invention is not limited to this. For example, in the case of an information recording disc on which three programs are recorded, one field each, distributed over three fields, the reproduction needle 2 may be By drawing a scanning locus as shown by the solid line in FIG. 11, any negative program among the three programs is played normally,
If the kick is paused during the vertical blanking period recording portion e or f to be kicked, another program can be switched and played.

Therefore, if L is the maximum number of recording programs for an information recording disk in which two fields of video signals are recorded per -rotation, it is expressed as l-=(2/n)+10. However, n is the same as n in equation (1), and 2
/n is an integer (n = 1.2. 0.5>.

As described above, according to the present invention, it is possible to instantly move between different types of programs, so that the interest in games, etc. is never lost. Further, the information recording disk according to the present invention is not limited to use in games, but can also be applied to learning to drive a car, learning to fly an airplane, etc.

Effect-L As described above, according to the present invention, information signals of two or more different programs are sequentially recorded in chronological order by being switched in field units of values equal to or less than a plurality of fields recorded per revolution. , and an information recording in which an address signal having a code indicating the kick position and kick direction during normal reproduction of the reproduction element and a code indicating the program number is recorded within at least the negative vertical blanking period of each track. Play the disc and calculate the difference between the program number N of the program to be switched and the program number M currently being played obtained from the playback output of the address signal, and calculate the difference depending on the sign of the value. Since the number of kick pulses is generated according to the polarity and the value, even if there are 3 or more recorded programs, it is possible to switch playback from the program currently being played to any other program. The programs that can be switched and played back are not limited to programs that are recorded following the program that is being played back, but can also be switched and played back to other programs that are recorded on other tracks. This allows you to switch and play more programs at will, so when you play a game disc, you can proceed in real time without losing interest in the game. It has features such as being able to further increase entertainment.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams showing an example of the frequency spectrum of an information signal recorded on an information recording disk to be reproduced by the reproducing apparatus of the present invention and the frequency spectrum after frequency modulation, respectively, and FIG. 3 is a diagram showing an example of the frequency spectrum after frequency modulation. A diagram schematically showing an example of a track pattern of an information recording disk to be reproduced by the apparatus, and FIGS. 4 and 5 respectively show the program recording arrangement and reproduction time of the information recording disk to be reproduced by the reproduction apparatus of the present invention. FIG. 6 is a block system diagram showing an embodiment of the reproducing apparatus of the present invention, and FIGS. 7 and 8 are shown on the vertical axes of FIGS. 4 and 5, respectively. FIG. 9 is a flowchart for explaining the operation of the essential parts of the reproducing apparatus of the present invention, and FIGS. FIG. 4 is a diagram showing each scanning locus of a playback button during normal playback of an information recording disk having a program recording arrangement. DESCRIPTION OF SYMBOLS 1... Information recording disc, 2... Reproduction needle, 4... Demodulation circuit, 5... [P3 detector, 8... Switching pulse generator, 12... Kick pulse generator, 13・・・
・Comparative circuit, 14... Differential amplifier, 16... Tracking coil, 19.20... Memory, 22...
- Atonenos regeneration circuit, 23...microcomputer. ? yraaa6c+-28080 (10) Figure 5

Claims (1)

[Claims] An information signal including at least a video signal is recorded on the same track at a rate of a plurality of fields per revolution, and the information signals of two or more different programs each have a field having a value equal to or smaller than the plurality of fields. Instructs the forced change position and change direction of playback 1 to rack during normal playback of the playback element which is switched in units and recorded sequentially in chronological order and picks up and plays back the already recorded edge information signal, and also instructs the recording program. A reproducing apparatus for reproducing an information recording disk in which an address signal indicating a program number assigned in advance to 1 in the recording order is recorded within at least - vertical blanking periods of each track, the reproducing apparatus transport means for forcibly changing the reproduction track of the element; demodulation means for demodulating the reproduction signal extracted from the reproduction element into the original information signal; an address reproducing circuit for reproducing , an input means for inputting a program number of a program for normal reproduction, and a value of the difference between the program number N from the input means and the program number M currently being reproduced from the address reproducing circuit. is calculated, and a kick pulse is generated with a polarity corresponding to the positive or negative of the calculated value and a number of kick pulses corresponding to the calculated value, and when the calculated value is zero, the instruction code in the playback address signal is followed. means for generating a kick pulse of polarity and outputting it to the transfer means, forcibly moving the reproducing element toward the outer periphery or the inner periphery according to the positive or negative of the calculated value by a track pitch corresponding to the calculated value; A reproducing device for an information recording disc, which is characterized in that it is transported and reproduced.