JPH01320645A - Video disk and its recording and reproducing device - Google Patents

Abstract

PURPOSE:To lower the number of revolutions of a disk by recording a video signal by irradiating two tracks on an original disk with light beams modulated by their respective light modulators. CONSTITUTION:A digitalized MUSE signal (b) is changed every one line in its output to memories 6 and 7 alternately by a changeover circuit 5 to be written in turn. The intensity of laser light is modulated by light modulators 16 and 17 in accordance with recording signals (d) and (g). Then, each laser light as passed through the light modulators respectively is synthesized with each other into one laser light beam by optical parts 25 and 26, and the synthesized laser light is controlled by a mirror 18 and an objective lens 19 so as to focus on the original disk 20 in an objective position. By this method, two laser beams modulated in intensity by the modulators 16 and 17 respectively are formed into spots on the original disk 20, and two tracks are recorded with two spots by rotating the original disk 20 with a motor 21. Consequently, the number of revolutions of the disk can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video disc in which a pilot signal is frequency-multiplexed and recorded together with a video signal, and a recording and reproducing apparatus thereof.

2. Description of the Related Art In recent years, a high-definition television system (high-definition) has been proposed that can display wider images with higher definition than current television systems. This high-definition television system has more than twice the amount of information compared to the current television system, so even if it is recorded on a conventional video disc, it can only be recorded for a very short time. On the other hand, NHK has compressed the bandwidth of high-definition television signals and can broadcast them using one channel of satellite broadcasting.
The USE method was developed. By using a MUSE signal obtained by band-compressing a high-definition television signal using this method, it is possible to extend the recording time of a video disc. However, since the MUSE system was developed for satellite broadcasting, the synchronization signal has positive polarity. For this reason, it is not possible to easily extract the synchronization signal by amplitude separation, as is the case with current television signals, and it is difficult to use this synchronization signal to control the rotational speed of the disk or to correct the time base (jitter). Therefore, M.U.S.
A pilot signal is frequency-multiplexed with the E signal and recorded on the disk, and during playback, this pilot signal is used to control disk rotation and jitter. (For example, Ninomiya et al.:
Optical video disc for high-definition television using MUSE system IPA73-s) Generally, when recording a video signal such as a MUSE signal on a disc, FM modulation is performed. Therefore, the pilot signal is frequency-multiplexed in a lower band than the lower sideband of the FM modulated wave.

Problems to be Solved by the Invention If a high-definition television signal is band-compressed using the MUSE method, it becomes an analog signal with a maximum frequency of s, 1 MHz.

The band of this MUSE signal is approximately twice that of current television signals. Therefore, if the same shortest recording wavelength as the current video disc used for recording television signals is used, the linear velocity during recording and playback will be approximately twice as high. To accommodate this, either the radius of the innermost circumference must be increased or the rotational speed of the disk must be increased. If the radius of the innermost circumference is increased, the time that can be recorded on the disc becomes shorter. Furthermore, if the rotational speed of the disk is increased, the load on the motor that rotates the disk increases. Optical video discs are controlled so that the laser beam is focused along the tracks on the disc during recording and playback, but as the rotational speed increases, the control system must have a wider bandwidth. Control tends to become unstable.

Furthermore, when a recording signal obtained by FM modulating the MUSE signal and a pilot signal are frequency multiplexed and recorded on and reproduced from a disk, intermodulation components are generated. This intermodulation component becomes an interfering pattern on the demodulated screen and significantly deteriorates the image quality. Therefore, the frequency of the pilot signal is selected to have a specific relationship with the horizontal frequency of the video signal. However, M
In the USE method, the screen is compressed by dividing it into a still area and a moving area, and during playback, the method of interpolating pixels differs depending on each area. In particular, when performing motion vector correction, 1
The signal from the previous frame is moved horizontally and vertically according to the motion vector to interpolate the pixels of the current frame, so the phase of the mixed pilot signal changes every frame, and if the phase matches between frames, the pilot signal This will emphasize signal interference. In this way, interference caused by pilot signals varies depending on the processing method used during reproduction, and therefore cannot be dealt with simply by selecting a frequency.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a video disc and a recording/reproducing apparatus thereof that can reduce the number of rotations of the disc and further reduce interference caused by pilot signals.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for solving the problems described above.
A switching circuit that divides each line into two channels, a multiplexing circuit that frequency-multiplexes a pilot signal onto the signal of one channel, a first optical modulator that modulates the pilot signal with the multiplexed recording signal, and a pilot signal. and a second optical modulator that modulates with a recording signal that is not multiplexed, and records a video signal by irradiating the optical beam modulated by each optical modulator onto two tracks on the master disk. A pilot signal is frequency-multiplexed together with a video signal and recorded on a video disc master using a video disc recording device characterized by the following.

When playing back a video disc recorded in this way, two tracks on the video disc are each irradiated with a playback laser beam, a photodetector receives the reflected light from each track, and a photodetector is used to detect the playback signal from one of the tracks. Pilot signal
a clock regeneration circuit that regenerates a clock signal from this pilot signal, a memory that writes two channels of reproduced signals using the regenerated clock and reads them using an internal reference clock, and a clock regeneration circuit that regenerates a clock signal from this pilot signal. A switching circuit that sequentially switches and reads out two channels of reproduced signals from memory, a phase comparison circuit that compares the phase of the pilot signal generated from the reference clock and the reproduced pilot signal, and a motor servo that controls the motor based on this phase difference. A video disc playback device is used.

Function According to the present invention, a video signal is divided into two channels for each line and recorded on two tracks. When reproducing a video disc recorded in this manner, two tracks on the video disc are each irradiated with a reproducing laser beam to reproduce two-channel signals. In this way,
By dividing the video signal into two channels and recording and reproducing them, the signal band in each channel becomes half of the original signal. Therefore, even if the shortest recording wavelength is the same, the linear velocity can be halved.

Furthermore, since two channels of signals are reproduced by simultaneously irradiating each track with a reproduction laser beam, the fluctuations in the time axis occurring in each channel are approximately equal. Therefore, it is possible to multiplex and record a pilot signal on one channel and use the time axis fluctuation component detected from this pilot signal during playback to correct the time axis fluctuation of the two channels.

If the video signal is divided into two channels per line, only one channel will be affected by the pilot signal, so that each line without interference will be reproduced on the playback screen. Therefore, image quality deterioration can be reduced regardless of the MUSE method interpolation processing.

Examples Examples of the present invention will be described below. In this example,
A MUSE signal is used as the video signal.

First, a recording device for recording video signals onto a master disc will be explained.

FIG. 1 is a block diagram showing the configuration of a disc recording apparatus in this embodiment. In Figure 1, 1 is the input terminal, 6
12 is a switching circuit, 12 is a pilot signal generation circuit, and 13 is a switching circuit.
1 is a multiplex circuit, 16 and 17 are optical modulators, and 20 is a master disc. A high-definition television signal is band-compressed by a MUSE encoder and converted into a MUSE signal, which is then applied to an input terminal 1.

The input MUSE signal a is subjected to DC reproduction by a clamp 2, unnecessary components are removed by a low-pass filter 3, and converted into a digital signal by an A/D converter 4.

The switching circuit 6 switches the digitized MUSE signal to 1.
The output destination is switched between the memory 6 and the memory 7 for each line, and data is sequentially written. memory e.

The memory 7 is a line memory that can store one line of MUSE signals. The two memories sequentially write the data of each pixel sent line by line from the switching circuit 6, and read out the data of each pixel by doubling the time axis at half the writing frequency. D
The /A converter 8 converts the digital signal read out from the memory 6 into an analog signal. This time-axis expanded MUSE signal C is modulated by an FM modulator 1o, converted into a rectangular wave by a waveform shaping circuit 14, and then inputted to an optical modulator 16 as a recording signal d. Similarly, the D/A converter 9 converts the data read from the memory 7 into an analog signal. This time-base expanded MUSE signal e is modulated by an FM modulator 11 and applied to a multiplex circuit 13.

The multiplexing circuit 13 frequency-multiplexes the pilot signal generated by the pilot signal generation circuit 12 onto this FM modulated wave to obtain a multiplexed signal f. After converting it into a rectangular wave in the waveform shaping circuit 16, it is input to the optical modulator 17 as a recording signal q. The laser beam oscillated by the argon laser 18 is transmitted to the optical component 22.
．． At 23 and 24, the laser light is divided into two beams, which pass through the optical modulator 16 and the optical modulator 17, respectively. The optical modulator 16 and the optical modulator 17 each modulate the intensity of the laser beam according to the recording signal d1 and the recording band q. Optical components 25 and 26 combine the laser beams that have passed through each optical modulator into one laser beam. The mirror 18 and the objective lens 19 are controlled so that the combined laser light is focused at a desired position on the master disc 2°.

Thereby, two spots of laser light whose intensity is modulated by the optical modulator 16 and the optical modulator 17 are formed on the disk master 2o, respectively. The motor 21 is the disk master 20
Rotate and record two tracks at two spots.

FIG. 2 is a schematic diagram showing the recording surface of a video disc on which video signals are recorded as described above.

In FIG. 2, two laser beam spots 30 and 31 form recording pits along tracks 32 and 33, respectively. Note that the actual recording is performed by coating a photoresist on the master disc and exposing it to laser light, so the recorded bits are not visible before development, but they are shown schematically here. Also,
The method for creating a video disc for playback from such a master disc is the same as that for conventional video discs, so the explanation will be omitted.

Next, FIG. 3 shows a format in which the MUSE signal is recorded by dividing it into two channels for each line.

In FIG. 3, two tracks are referred to as track A and track B, and each square in the figure represents an area in which data for one line is recorded. As shown in the figure, if in the first frame the odd numbered lines are recorded on track A and the even numbered lines are recorded on track B, then in the +1st frame the even numbered lines are recorded on track A and the odd numbered lines are recorded on track B. B, and the -)-2 frame is the same as the -2 frame. In this embodiment, it is assumed that a pilot signal is multiplexed and recorded on track B.

Next, a reproducing apparatus for reproducing a video disc on which video signals have been recorded as described above will be described. FIG. 4 is a block diagram showing the configuration of the disc playback device in this embodiment. In FIG. 4, 40 is a video disk;
2 is a semiconductor laser, 45 is an optical output, 54 is a bandpass filter, 58 is a clock regeneration circuit, 52, 5 is a memory, 59 is a switching circuit, e4 is a phase comparison circuit, 66
is a motor servo. The video disc 40 is rotated by a motor 66. The semiconductor laser 42 emits two reproduction laser beams. The reproduction laser beam is focused onto the disk by an objective lens 41. Objective lens 41
As in the case of FIG. 2, the spot of the reproducing laser beam is controlled so as to follow each track. Optical components 43 and 44 separate the laser light emitted from the semiconductor laser 42 and the laser light reflected from the disk, and make the reflected light enter the photodetector 45. The photodetector 45 receives reflected light from the two tracks, performs photoelectric conversion, and then outputs it to each preamplifier. A reproduced signal j reproduced from track A shown in FIG. 3 is amplified by a preamplifier 46, equalized by an equalizer 48, and demodulated by an FM demodulator 6o to produce a MUSE signal l. Similarly, the reproduction signal reproduced from track B is amplified by a preamplifier 47, equalized by an equalizer 49, and applied to a bypass filter 53 and a bandpass filter 64. Since this reproduced signal k has a pilot signal multiplexed on the FM modulation signal, the bypass filter 63 extracts the FM modulation signal, and the bandpass filter 54 extracts the pilot signal p. Extracted F
The M modulated signal is demodulated by an FM demodulator 66 to form a MUSE signal m. The clock reproducing circuit 58 generates a clock n corresponding to a pixel of the MUSE signal recorded by time-axis expanding the extracted pilot signal p. The A/D converter 51 converts the MUSE signal l demodulated by the clock n into a digital signal and writes it into the memory 62.

Similarly, the A/D converter 56 converts the MUSE signal m demodulated by the clock n into a digital signal, and stores it in the memory 57.
Write to. In addition, the reference clock generation circuit 62 is the original M
A clock O corresponding to the pixel of the USE signal is generated. The switching circuit 69 selects the input destination for each line from the memory 6.
2 and memory 57 and read out according to clock 0. The D/A converter 60 converts the data of the read MUSE signal into an analog signal, amplifies it with the amplifier 61, and outputs it from the output terminal 67. The output MUSE signal is
The E-decoder performs reproduction processing to reproduce a high-definition television signal. Further, the reference pilot signal generation circuit 63 generates a pilot signal q synchronized with the clock O from the clock O. The phase comparison circuit 64 compares the phases of the internally generated pilot signal q and the reproduced pilot signal p, and generates a phase error signal r. Motor servo circuit 6
6 controls the rotation speed of the motor so that the phase error signal r does not accumulate.

As described above, according to this embodiment, since two channels of signals are reproduced by simultaneously irradiating each track with the reproducing laser beam, the fluctuations in the time axis occurring in each channel are approximately equal. Therefore, the demodulated reproduced signals of the two channels were written to the memory using the clock reproduced from the pilot signal multiplexed and recorded on one channel, and the time axis was expanded and recorded by reading them from the memory using the reference clock. At the same time as compressing the time axis of the MUSE signal and converting it to the original MUSE signal, it is possible to remove time axis fluctuations (jitter) contained in the reproduced signal.

Regular fluctuations in the time axis can be removed by controlling the rotation speed of the motor so that the phase error signal of the pilot signal becomes small.

As shown in Figure 3, only the line recorded on track B is affected by the pilot signal;
Since the signals are separated line by line, in one frame of the playback screen, pilot signals are mixed only in even-numbered lines, and in the next frame, pilot signals are mixed in odd-numbered lines. When the MUSE decoder performs reproduction processing, even if interpolation is performed within a field or between fields, there is a line free from interference for each line, so image quality deterioration due to pilot signals can be reduced. Furthermore, when interpolating between frames, the signal from one frame before moves due to the motion vector, but the phase of the pilot signals match, making it possible to reduce the probability that interference will be emphasized.

In this embodiment, the interference can be reduced regardless of the frequency of the pilot signal, but by specifying the frequency of the pilot signal, the interference can be further reduced. This example will be described next. If the horizontal synchronization frequency of the video signal is fh, then the frequency fp of the pilot signal is fh
/4 offset.

f, p = (m+1/4) fh m: Positive integer The recording device in this embodiment has the same configuration as the recording device shown in FIG. do it.

Further, the reproducing apparatus in this embodiment may have the same configuration as the reproducing apparatus shown in FIG. 4, and the resonant frequency of the bandpass filter 54 may be set to the above frequency fp.

In this embodiment as well, the time axis is expanded when recording the video signal, and the time axis is compressed when playing back. Therefore, if a pilot signal of frequency fp is mixed in during recording or reproduction, it becomes an interference signal of frequency 2fp on the reproduction screen, and the phase is reversed between consecutively recorded lines. When the MUSE signal is recorded as a video signal in the format shown in FIG. 3, FIG. 6 shows the interference signal caused by the pilot signal on the playback screen. In FIG. 6, it is assumed that the phase of the interference signal on the m-th line of the frame is the phase shown in the figure (referred to as positive polarity). No interfering signal will be mixed into the next (m+1)th line. At the m+2 line, the phase of the interference signal is reversed and has negative polarity. The phase changes in order as shown in the figure below. In the case of intra-field processing, there is a line without interference for each line, and the polarity of lines with interference is always reversed, so interfering signals can be reduced by intra-field interpolation. In the case of inter-field processing, the phase of the interfering signal is reversed between adjacent lines between fields, and since there is no interfering signal on the two lines before and after that, inter-field interpolation is used to eliminate the interfering signal. The signal can be reduced. If the playback screen is a completely still image with no movement, the interference signal on a certain line disappears every frame and is reversed every two frames, so interpolation between frames reduces the interference signal. be able to. Also, if the motion vector is left or right,
Since the interfering signals do not overlap on the same line, inter-frame interpolation does not emphasize the interfering signals. Furthermore, if the motion vector has vertical components, interframe interpolation may match the phase of the interference signal and emphasize the interference, but conventional Compared to the method, the probability that the phases match is smaller.

Now, as described above, an embodiment of the signal format on the disc when the video signal is divided into two channels and recorded on two tracks will be described. In this embodiment, as shown in FIG. 1, two laser beams modulated by respective recording signals are incident on the same objective lens and recorded on a disk. At this time, as shown in FIG. 2, two tracks 32.
33 is formed. In this example, Suboc) 30.31
Let the interval be the track pinch, and let the feed pitch at which the spot moves during one rotation be at least twice the track pitch. In this way, a video disc is obtained in which a track on which a recording signal with a pilot signal multiplexed thereon and a track on which a recording signal on which no pilot signal is multiplexed are recorded in parallel and formed in a spiral shape. The format of the track thus formed is shown in FIG. When tracking and controlling the two playback laser beam spots along each track of this video disc, tracks recorded by multiplexing pilot signals and tracks that do not contain pilot signals are identified, and the channel corresponding to the track is identified. A spot must be irradiated. FIG. 5 is a schematic diagram showing the reproducing laser beam incident on the recording surface of the video disc 4o. In FIG. 6, spots 34 and 35 of the reproducing laser beam are located on tracks 38 and 38, respectively. It is incident on track 39. Also, spot 3
A spot 36 and a spot 37 for trunking are arranged at positions around 40 and slightly shifted left and right from the center of the spot 34. Three-beam tracking control is performed using spots 34, 36, and 37, and the spot 34 is controlled to be located at the center of the track. The spots 36 are initially set to be located at a position separated from the spots 34 by a track pitch. Truck 38 Truck 3
Since tracks 9 and 9 are simultaneously recorded on the master disc, the two tracks are formed almost parallel to each other. Therefore, if the spot 34 is controlled to follow the track 38, the spot 35 can also be made to follow the adjacent track 39. In this embodiment, it is assumed that a track recorded by multiplexing a pilot signal at the spot 34 is reproduced. In other words, the signal reproduced at the spot 34 becomes the reproduced signal. When playing back a video disc, tracking control is first applied so that the spot 34 follows a certain track. Next, a bandpass filter 54 extracts a pilot signal p from the reproduced signal k, and a detection circuit 68 checks the magnitude of the pilot signal p.
If it cannot be detected, a control signal 8 is output to a control circuit (not shown in FIG. 4) so as to jump to the next track. If detected, playback of the two channels is started. As described above, according to this embodiment, by setting the recording spot at the track pitch, the interval between the two laser beams can be reduced and aberrations can be suppressed. Furthermore, since two tracks are formed next to each other, fluctuations in the time axis between the tracks can be reduced. Moreover, since the two tracks are alternately adjacent to each other, such control makes it possible to irradiate the spots of each channel corresponding to the track where the pilot signal is multiplexed and recorded and the track which does not contain the pilot signal.

Other embodiments of the present invention will be described below. In this embodiment, as a video disc, the cross section in the radial direction of the disc is V.
A disk with a V-shaped groove is used. Figure 7 shows
② It is a perspective view of a disk with grooves. In Fig. 7, To is the signal surface of the disc, 71.73 is the peak of the V groove, and 7
2 represents the valley of the groove, 75.76 represents a spot for recording or reproduction, and 77 represents a spot for tracking. When recording a video signal on this V-groove disk, tracking control is first performed so that the tracking spot 77 follows, for example, a valley of the V-groove. For example, a far field method can be used for such tracking control. The recording laser light spora) 75.78 is placed in the center of the slopes on both sides of the valley. The method of modulating each recording laser beam with two-channel recording signals and recording is the same as that of the recording apparatus shown in FIG. Even when reproducing a video signal from a video disc having such a V-groove, tracking control is performed so that the tracking spot 77 follows the valley of the V-groove. Reproduction laser light spot 75.76
are placed in the center of the slopes on both sides of the valley. The method of demodulating the two-channel recording signal from each reproducing laser beam and reproducing the original video signal is the same as that of the reproducing apparatus shown in FIG. 4. This tracking method can be controlled so that the tracking spot is always placed in the valley of the V groove,
Spot 75. The spots 76 can also each be located on the slope in the same direction. Therefore, the recording signal with multiplexed pilot signals and the recording signal without multiplexing can be recorded at the same voltage.
By recording on adjacent slopes of the groove, the same channel spots can always be placed on corresponding tracks.

In this example, the cross section of the groove on the disk is V.
Although a U-shaped groove is used, the present invention is not limited to this. For example, a U-shaped groove may be used to form tracks at the bottom of the groove and between the grooves.

Note that although the MUSE signal is used as the video signal in this embodiment, the present invention is not limited to this, and can be applied to the case where pilot signals are multiplexed and recorded.

Effects of the Invention As described above, according to the present invention, by dividing the video signal into two channels and recording and reproducing it, the linear velocity (rotation speed) of the disk can be halved. is big.

In addition, by simultaneously irradiating each track with a reproduction laser beam and reproducing two channels of signals, it is possible to reproduce the time of two channels using the time axis fluctuation component detected from the pilot signal multiplexed and recorded on one channel. Axis fluctuations can be corrected.

In addition, the video signal is divided into two channels per line,
By multiplexing and recording a pilot signal on one channel, only one channel is affected by the pilot signal, and each line without interference is reproduced on the reproduction screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the disc recording device in this embodiment, FIG. 2 is a schematic diagram showing the recording surface of a video disc, FIG. 3 is a formant diagram of the video disc in this embodiment, and FIG. The figure is a block diagram showing the configuration of the disc playback device in this embodiment, FIG. 5 is a schematic diagram showing the playback laser beam incident on the recording surface of the video disc 40, and FIG. 6 is a schematic diagram showing the playback screen. , Fig. 7 is a perspective view of a disc with a V-groove, and Fig. 8 is a schematic diagram 1 showing the format of tracks formed on the disc.
...Input end, 5...Switching circuit, 12...
... Pilot signal generation circuit, 13 ... Multiplex circuit, 16°17 ... Optical modulator, 20 ...
...Disc master, 40...Video disc,
42 is a semiconductor laser, 45... photo detection Mr.
54...Band pass filter, 58...
・Clock regeneration circuit, 52.57...memory,
59...Switching circuit, 64...Phase comparison circuit, 65...Motor servo. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 11'

Claims (7)

[Claims] (1) A device that frequency multiplexes a pilot signal together with a video signal and records it on a video disc master, which includes a switching circuit that divides each line of the video signal into two channels, and a pilot signal that is added to the signal of one channel. A first optical modulator that modulates a recording signal with a pilot signal multiplexed thereon, a second optical modulator that modulates a recording signal with no pilot signal multiplexed, and each A video disc recording device characterized in that a video signal is recorded by irradiating a light beam modulated by an optical modulator onto two tracks on a master disc. (2) The horizontal synchronization frequency of the video signal is fh = (m + 1/4
2. The video disc recording apparatus according to claim 1, further comprising a pilot signal generation circuit that generates a pilot signal having a frequency fp of ) fh [m: a positive integer]. (3) A device that plays back a video disc recorded by frequency multiplexing a pilot signal with a video signal, which irradiates each of two tracks on the video disc with a laser beam for playback and receives the reflected light from each track. a photodetector that extracts a pilot signal from one of the regenerated signals, a clock regeneration circuit that regenerates a clock signal from this pilot signal, and an internal reference clock that writes two channels of regenerated signals using the regenerated clock. 1. A video disc playback device comprising: a memory for reading data from the memory; and a switching circuit for sequentially switching and reading two channels of playback signals from the memory for each line of a video signal. (4) If the horizontal synchronization frequency of the video signal is fh, then fp
4. The video disk reproducing apparatus according to claim 3, further comprising a filter having a resonance frequency fp of =(m+1/4)fh [m: positive integer]. (5) A video disc in which a pilot signal is frequency-multiplexed with a video signal, and a track in which a recording signal with a pilot signal multiplexed is recorded and a track in which a recording signal without a pilot signal is recorded are parallel to each other. , a video disc characterized by being formed in a spiral shape. (6) When frequency-multiplexing and recording a pilot signal together with a video signal, the track on which the recording signal with the pilot signal multiplexed is recorded and the track on which the recording signal on which the pilot signal is not multiplexed are made parallel, and This device plays back the formed video disk, and includes a photodetector that irradiates two tracks on the video disk with a laser beam for playback, receives reflected light from each track, and a pilot signal from one of the playback signals. a clock regeneration circuit that regenerates a clock signal from this pilot signal, a memory that writes two channels of reproduced signals using the regenerated clock and reads them using an internal reference clock, and a clock regeneration circuit that regenerates a clock signal from this pilot signal. A switching circuit sequentially switches and reads out two channels of playback signals from memory, and a pilot signal is extracted from the playback signal of a preset channel after tracking control of the playback laser beam spot along the track on the video disc. 1. A video disc playback device comprising: a filter for detecting a pilot signal; and a detection circuit for detecting the presence or absence of a pilot signal, and jumping to an adjacent track when a pilot signal is not detected. (7) A video disc having a V-groove with a V-shaped cross section in the radial direction of the disc, which has two tracks: a track on which a recording signal with a pilot signal multiplexed is recorded and a track on which a recording signal without a pilot signal is recorded. A video disc characterized in that the video discs are formed on the same V-groove.