JPH0778876B2 - Video disc and recording / reproducing apparatus thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video disc in which a pilot signal is frequency-multiplexed with a video signal and recorded, and a recording / reproducing apparatus thereof.

2. Description of the Related Art In recent years, a high-definition television system (high-definition) has been proposed which can display a wide image having a higher definition than the current television system. Since this high-definition television system has more than five times the amount of information as the current television system, recording on a conventional video disc can only record for a very short time. On the other hand, MU capable of band-compressing high-definition television signals by NHK and broadcasting using one channel of satellite broadcasting.
SE method was developed. By using a MUSE signal that is a band compression of a high-definition television signal by 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 sync signal has a positive polarity. For this reason, it is not possible to easily extract the sync signal by amplitude separation like the current television signals, and this sync signal is used to control the rotation speed of the disk and the time axis (jitter).
It is difficult to make corrections. Therefore, the pilot signal is frequency-multiplexed with the MUSE signal and recorded on the disc, and the disc rotation and the jitter control are performed by using the pilot signal during reproduction. (For example, Ninomiya et al .: Optical video disc IPA73-8 for high-definition television by MUSE method)
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 the 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 by the MUSE method, it becomes an analog signal with a maximum frequency of 8.1 MHz. The band of this MUSE signal is about twice that of the current TV signal. Therefore, if the same shortest recording wavelength as that of the current video signal recording television signal is used, the linear velocity at the time of recording / reproducing needs to be doubled. To deal with this, 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 will be shortened. Moreover, if the number of rotations of the disk is increased, the load on the motor for rotating the disk is increased. In optical video discs, the laser light is controlled to focus along the tracks on the disc during recording / playback, but if the number of revolutions increases, the control system band must be widened. Control tends to be unstable.

Further, when a recording signal obtained by FM-modulating the MUSE signal and a pilot signal are frequency-multiplexed and recording and reproducing are performed on the disc, an intermodulation component is generated. This intermodulation component becomes an interference pattern on the demodulated screen, and the image quality is significantly deteriorated. Therefore, the frequency of the pilot signal is selected in a specific relationship with the horizontal frequency of the video signal. However, in the MUSE method, the screen is divided into a still area and a moving area for compression, and the method of interpolating pixels is different for each area during reproduction.
In particular, when performing motion vector correction, the signal of the previous frame is moved in the horizontal and vertical directions according to the motion vector to interpolate the pixels of the current frame, so the phase of the mixed pilot signal changes for each frame. , When the phases match between frames, the interference of the pilot signal is emphasized. In this way, the interference by the pilot signal is
Since it depends on the processing method at the time of reproduction, it cannot be handled only by selecting the frequency.

The present invention has been made in view of the above points, and an object of the present invention is to provide a video disc and a recording / reproducing apparatus thereof, which can reduce the rotation speed of the disc and further reduce interference due to a pilot signal.

Means for Solving the Problems An apparatus for frequency-multiplexing a pilot signal with a video signal and recording the same on a video disc master, and a switching circuit for dividing each line of the video signal into two channels,
A memory that expands the signals of each divided channel on the time axis, an FM modulator that FM-modulates the signals expanded on the time axis, a multiplexing circuit that frequency-multiplexes the pilot signal on the FM modulated signal of one channel, and the pilot signal is multiplexed. A first optical modulator that modulates with the recorded signal and a second optical modulator that modulates with the recording signal in which the pilot signal is not multiplexed, and the optical beam modulated by each optical modulator is a disc master. A video signal is recorded by irradiating the upper two tracks with a video disk recording device, and a pilot signal is frequency-multiplexed with the video signal and recorded on a video disk master.

When a video disc recorded in this way is played back, it is played back with a photodetector that irradiates two tracks on the video disc with playback laser light and receives reflected light from each track, and a photodetector. FM demodulate the generated signal
An FM demodulator, a filter that extracts a pilot signal from one of the reproduced signals, a clock reproduction circuit that reproduces a clock signal from this pilot signal, and a reproduced clock
A video disk comprising a memory for writing a demodulated signal of a channel and reading it with an internal reference clock, and a switching circuit for sequentially switching and reading a reproduced signal of two channels from the memory for each line of a video signal. Use a playback device.

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

Further, since the reproducing laser light is simultaneously irradiated to the respective tracks to reproduce the signals of the two channels, the fluctuations of the time axis occurring in the respective channels become almost equal. Therefore, the pilot signal can be multiplexed and recorded on one channel, and the time-axis variation of the two channels can be corrected by using the time-axis variation component detected from the pilot signal during reproduction. If the video signal is divided into two channels for each line, only one channel is affected by the pilot signal, so that a line without interference is reproduced for each line on the reproduction screen. Therefore, it is possible to reduce image quality deterioration regardless of MUSE interpolation processing.

EXAMPLES Examples of the present invention will be described below. In this embodiment,
Use MUSE signal as video signal.

First, a recording device for recording a video signal on a master disc will be described.

FIG. 1 is a block diagram showing the structure of the disk recording apparatus in this embodiment. In FIG. 1, 1 is an input end, 5
Is a switching circuit, 12 is a pilot signal generating circuit, 13 is a multiplexing circuit, 16 and 17 are optical modulators, and 20 is a disk master.
Band compression of high-definition TV signal by MUSE encoder
After converting to MUSE signal, add to input terminal 1. Input MU
The SE signal a is subjected to direct current reproduction by the clamp 2, the unnecessary component is removed by the low pass filter 3, and converted into a digital signal by the A / D converter 4. The switching circuit 5 is digitized
The destination for outputting the MUSE signal b for each line is switched to the memory 6 and the memory 7 and sequentially written. The memories 6 and 7 are line memories capable of storing one line of the MUSE signal. The two memories sequentially write the data of each pixel sent from the switching circuit 5 for each line and read the data of each pixel by doubling the time axis at a half frequency of the writing. D / A converter 8
Converts the data read from the memory 6 into an analog signal. The MUSE signal c that has been expanded on this time axis is applied to the FM modulator 10
After being modulated by, and converted into a rectangular wave by the waveform shaping circuit 14, it is input to the 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. The MUSE signal e, which has been expanded along the time axis, is modulated by the FM modulator 11 and added to the multiplexing circuit 13. The multiplexing circuit 13 frequency-multiplexes the FM modulated wave with the pilot signal generated by the pilot signal generating circuit 12 to obtain a multiplexed signal f. After being converted into a rectangular wave by the waveform shaping circuit 15, it is input to the optical modulator 17 as a recording signal g. The laser light oscillated by the argon laser 18 is divided into two laser lights by the optical components 22, 23 and 24, and passes through the optical modulator 16 and the optical modulator 17, respectively. The optical modulator 16 and the optical modulator 17 have a recording signal d and a recording signal g, respectively.
The intensity of the laser light is modulated according to. The optical components 25 and 26 combine the laser beams that have passed through the respective light modulators into one laser beam. The mirror 18 and the objective lens 19 perform control so that the combined laser light is focused on a target position on the disk master 20. As a result, 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 20. The motor 21 rotates the disc master 20 and records two tracks with two spots.

FIG. 2 is a schematic diagram showing the recording surface of the video disc on which the video signal is recorded as described above. In FIG. 2, two laser light spots 30 and 31 form recording pits along tracks 32 and 33, respectively. The actual recording is performed by coating a photoresist on the disc master and exposing it to laser light, so the recording pits are not visible before development,
It is shown schematically here. The method of producing a video disc for reproduction from such a disc master is the same as that of the conventional video disc, and therefore its explanation is omitted.

Next, FIG. 3 shows a format when the MUSE signal is divided into two channels for each line and recorded. Third
In the figure, two tracks are shown as track A and track B.
The squares in the figure represent the area in which the data for one line is recorded. As shown in the figure, when the odd-numbered lines are recorded on the track A and the even-numbered lines are recorded on the track B in the Kth frame, the even-numbered lines are track A and the odd-numbered lines are track B in the K + 1th frame. , And the K + 2th frame is the same as the Kth frame. In this embodiment, it is assumed that the pilot signal is multiplexed and recorded on the track B.

Next, a reproducing apparatus for reproducing the video disc on which the video signal is recorded as described above will be described. FIG. 4 is a block diagram showing the structure of the disc reproducing apparatus in this embodiment. In FIG. 4, 40 is a video disk, 42 is a semiconductor laser, 45 is a photodetector, 54 is a bandpass filter, 58 is a clock recovery circuit, 52 and 57 are memories, 59 is a switching circuit, 64 is a phase comparison circuit, 65 is a motor servo. The video disc 40 is rotated by the motor 66. The semiconductor laser 42 emits two reproducing laser beams. The reproducing laser light is focused on the disc by the objective lens 41. The objective lens 41 controls the spot of the reproducing laser light so as to be along each track as in the case of FIG. The 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. Photo detector
The 45 receives the reflected light from the two tracks, photoelectrically converts it, and outputs it to each preamplifier. The reproduction signal j reproduced from the track A shown in FIG.
Amplify with, equalize with equalizer 48, demodulate with FM demodulator 50 to obtain MUSE signal 1. Similarly, the reproduction signal k reproduced from the track B is amplified by the preamplifier 47 and equalized by the equalizer 49.
Is equalized by and is added to the high pass filter 53 and the band pass filter 54. Since the pilot signal is multiplexed with the FM modulation signal in this reproduction signal k, the high pass filter 53
The FM modulated signal is extracted with and the pilot signal p is extracted with the band pass filter 54. FM demodulator for the extracted FM modulated signal
It demodulates at 55 and makes it a MUSE signal m. The clock recovery circuit 58 is
Recording was performed by extending the extracted pilot signal p on the time axis.
The clock n corresponding to the pixel of the MUSE signal is generated. A / D
The converter 51 converts the MUSE signal 1 demodulated by the clock n into a digital signal and writes it in the memory 52. Similarly, A /
The D converter 56 converts the MUSE signal m demodulated by the clock n into a digital signal and writes it into the memory 57. Further, the reference clock generation circuit 62 generates a clock o corresponding to the pixel of the original MUSE signal. The switching circuit 59 switches the input destination for each line between the memory 52 and the memory 57 and reads out according to the clock o. D / A converter 60 is read MUSE
The signal data is converted into an analog signal, amplified by the amplifier 61, and output from the output terminal 67. The output MUSE signal is MUSE
Playback processing is performed by the decoder to play back high definition TV signals. In addition, the reference pilot signal generation circuit 63 uses the clock o.
To generate a pilot signal q synchronized with this clock. The phase comparison circuit 64 compares the phases of the internally generated pilot signal q and the reproduced pilot signal p, and generates the phase error signal r. The motor servo circuit 65 is
The rotation speed of the motor is controlled so that the phase error signal r does not accumulate.

As described above, according to this embodiment, since the reproducing laser light is irradiated to each track at the same time to reproduce the signals of two channels, the fluctuations of the time axis occurring in each channel are almost equal. Therefore, the reproduced signals of the demodulated two channels are written in the memory by using the clock reproduced from the pilot signal multiplexed and recorded in one channel, and read out from the memory by the reference clock, so that the time axis is expanded and recorded. The MUSE signal is compressed on the time axis and the original
At the same time as converting to the MUSE signal, it is possible to remove the time base fluctuation (jitter) included in the reproduction signal. The steady fluctuation of 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 FIG. 3, only the line recorded on the track B is affected by the pilot signal, and the MUSE signal is separated line by line. And a pilot signal is mixed in an odd line in the next frame. MU
When a reproduction process is performed by the SE decoder, even if interpolation is performed within a field or between fields, there is a line that does not interfere with each line, and therefore deterioration in image quality due to a pilot signal can be reduced. Further, when interpolating between frames, the signal one frame before moves due to the motion vector, but it is possible to reduce the probability that the phases of the pilot signals match and interference is emphasized.

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

fp = (m + 1/4) fh m: positive integer In the recording apparatus according to the present embodiment, the oscillation frequency of the pilot signal generating circuit 12 may be the above-mentioned frequency fp with the same configuration as the recording apparatus shown in FIG. . Further, the reproducing apparatus in this embodiment also has the same configuration as the reproducing apparatus shown in FIG. 4, and the resonance frequency of the bandpass filter 54 may be set to the frequency fp. Also in this embodiment, the time axis is expanded during recording of the video signal and the time axis is compressed during reproduction. Therefore, when a pilot signal of frequency fp is mixed during recording and reproduction, it becomes a disturbing signal of frequency 2fp on the reproduction screen, and the phase is inverted between continuously recorded lines. When the MUSE signal is recorded as the video signal in the format shown in FIG. 3, the state of the interference signal due to the pilot signal on the reproduction screen is shown in FIG. In FIG. 6, it is assumed that the phase of the disturbing signal in the m-th line of the k-th frame is the phase shown in the figure (called positive polarity). No interference signal is mixed in the next (m + 1) th line. In the (m + 2) th line, the phase of the disturbing signal is inverted and has a negative polarity. The phase sequentially changes 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 the line with interference is always inverted, so that the interfering signal can be reduced by the field interpolation. In the case of inter-field processing, the phase of the interfering signal is inverted between adjacent lines that are adjacent to each other between fields, and since there is no interfering signal in the two lines before and after the inter-field processing, interfering signals are interpolated by inter-field interpolation. Can be reduced. When the playback screen is a complete still image and the motion vector is O, the disturbing signal on a certain line is
It disappears every frame, and it inverts every two frames.
Interfering signals can be reduced by inter-frame interpolation. Further, when the motion vector is in the left-right direction, the interference signals do not overlap on the same line, so that the interference signals are not emphasized by interframe interpolation. Also,
When there is a vertical component in the motion vector, the phase of the interfering signal may be matched by inter-frame interpolation and the obstruction may be emphasized, but compared to the conventional method in which the interfering signal occurs in all lines, The probability that the phases match will be small.

Now, an embodiment of the signal format on the disc when the video signal is divided into two channels and recorded on two tracks as described above will be described. In this embodiment, as shown in FIG. 1, two laser beams modulated by respective recording signals are made incident on the same objective lens to record on the disc. At this time, as shown in FIG.
3 is formed. In this embodiment, the interval between the spots 30 and 31 is set to the track pitch, and the feed pitch at which the spot moves during one rotation is set to be twice the track pitch or more. As a result, a spirally formed video disc is obtained in which the track on which the recording signal in which the pilot signal is multiplexed and the track on which the recording signal in which the pilot signal is not multiplexed are recorded are parallel to each other. The format of the track thus formed is shown in FIG. When performing tracking control of two reproduction laser light spots along each track of this video disc, a track in which pilot signals are multiplexed and recorded and a track not including a pilot signal are identified, and a channel corresponding to the track is identified. The spot must be illuminated. FIG. 5 is a schematic diagram showing the reproducing laser light incident on the recording surface of the video disk 40. In FIG. 5, spots 34 and 35 of the reproducing laser light are track 38 and track 39, respectively.
Is incident on. Also, before and after spot 34, spot 34
A spot 36 and a spot 37 for position tracking which are slightly deviated from the center of the left and right are arranged. Spot 34,
Three-beam tracking control is performed using the spot 36 and the spot 37, and the spot 34 is controlled to be located at the center of the track. Initially, the spot 35 is set at a position separated from the spot 34 by a track pitch. Since the track 38 and the track 39 are simultaneously recorded on the disk master, the two tracks are formed substantially in parallel. Therefore, if the spot 34 is controlled so as to be along the track 38, the spot 35 can also be along the adjacent track 39. In this embodiment, it is assumed that the spot 34 is used to reproduce the track recorded by multiplexing the pilot signals. That is, the signal reproduced at the spot 34 becomes the reproduced signal k. When reproducing a video disc, first, tracking control is performed so that the spot 34 is along a certain track. Next, the bandpass filter 54 extracts the pilot signal p from the reproduced signal k, and the detection circuit 68 checks the magnitude of the pilot signal p to detect whether or not the pilot signal p is included. The control signal s is output to the control circuit (not shown in FIG. 4) so as to jump to the adjacent track. Then, if it can be detected, the reproduction of two channels is started. As described above, according to this embodiment, by setting the recording spot at the track pitch, the distance between the two laser beams can be reduced and aberration can be suppressed. Further, since the two tracks are formed adjacent to each other, it is possible to reduce the fluctuation of the time axis between the tracks. Also, because the two tracks are next to each other,
By such control, it is possible to irradiate the spot of each channel corresponding to the track in which the pilot signal is multiplexed and recorded and the track not including the pilot signal.

Another embodiment of the present invention will be described below. In this embodiment, the video disc has a V-shaped cross section in the disc radial direction.
A disk having V-shaped grooves is used. Figure 7 shows
FIG. 8 is a perspective view of a disc having a V groove. In FIG. 7, 70 is the signal surface of the disc, 71 and 73 are V-groove ridges, and 72 is V.
Groove valleys, 75 and 76 represent recording or reproducing spots, and 77 represents a tracking spot. When recording a video signal on this V-groove disk, first, tracking control is performed so that the tracking spot 77 is along the V-groove, for example, a valley. For such tracking control, for example, the far field method can be used. The recording laser light spots 75 and 76 are arranged in the center of the slopes on both sides of the valley. The method of modulating each recording laser beam with a recording signal of two channels and recording is the same as that of the recording apparatus shown in FIG. Even when a video signal is reproduced from a video disk having such a V groove, tracking control is performed so that the tracking spot 77 is along the valley of the V groove. The reproducing laser light spots 75 and 76 are arranged in the center of the slopes on both sides of the valley. A method of demodulating a recording signal of two channels from each reproduction laser beam and reproducing the original video signal is the same as that of the reproducing apparatus shown in FIG. This tracking method can be controlled so that the tracking spot is always arranged in the valley of the V groove.
Can also be located on the same slope.
Therefore, by recording the recording signal in which the pilot signal is multiplexed and the recording signal in which the pilot signal is not multiplexed on the adjacent slopes of the same V groove, it is possible to always arrange the spots of the same channel on the corresponding tracks.

In this embodiment, the groove on the disk has a V-shaped cross section.
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 between the bottom of the groove and the groove.

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 of multiplexing and recording pilot signals.

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

Also, by irradiating the reproducing laser light to each track at the same time to reproduce the signal of 2 channels, the time axis of 2 channels is detected by using the time axis fluctuation component detected from the pilot signal multiplexed and recorded in one channel. It is possible to correct axial fluctuations.

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

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a disc recording apparatus in this embodiment, FIG. 2 is a schematic diagram showing the recording surface of a video disc, FIG. 3 is a format diagram of the video disc in this embodiment, and FIG. Is a block diagram showing the configuration of the disc reproducing apparatus in the present embodiment, FIG. 5 is a schematic diagram showing a reproducing laser beam incident on the recording surface of the video disc 40, and FIG. 6 is a schematic diagram showing a reproducing screen. Figure 7 shows V
FIG. 8 is a perspective view of a disc having a groove, and FIG. 8 is a schematic diagram showing a format of tracks formed on the disc. 1 ... input end, 5 ... switching circuit, 12 ... pilot signal generating circuit, 13 ... multiplexing circuit, 16,17 ... optical modulator, 2
0 …… disc master, 40 …… video disc, 42 semiconductor laser, 45 …… photodetector, 54 …… bandpass filter, 58 …… clock recovery circuit, 52,57 …… memory, 59…
… Switching circuit, 64 …… Phase comparison circuit, 65 …… Motor servo.

Front Page Continuation (72) Inventor Tan Kitaura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP 59-154650 (JP, A) JP 57-46331 (JP, A)

Claims (7)

[Claims] 1. An apparatus for frequency-multiplexing a pilot signal together with a video signal and recording the video signal on a master disc of a video disc, wherein a switching circuit for dividing the video signal into two channels for each line and a signal for each divided channel. A memory that expands in the time axis, an FM modulator that FM-modulates the signal expanded in the time axis, a multiplexing circuit that frequency-multiplexes the pilot signal with the FM modulation signal of one channel, and a recording signal that has the pilot signal multiplexed It is equipped with a first optical modulator and a second optical modulator that modulates with a recording signal in which a pilot signal is not multiplexed, and the light beam modulated by each optical modulator is distributed to two tracks on the master disc. A video disk recording device characterized by recording a video signal by irradiation. 2. When the horizontal synchronizing frequency of the video signal is fh,
The video disc recording apparatus according to claim 1, further comprising a pilot signal generating circuit for generating a pilot signal having a frequency fp of fp = (m + 1/4) fh [m: positive integer]. . 3. A device for reproducing a video disc, in which a pilot signal is frequency-multiplexed with a video signal and recorded, wherein two tracks on the video disc are respectively irradiated with a reproducing laser beam to reflect light from each track. FM demodulation of the signal reproduced by the photo detector and the photo detector that receives the
An FM demodulator, a filter that extracts a pilot signal from one of the reproduced signals, a clock reproduction circuit that reproduces a clock signal from this pilot signal, and a reproduced clock
A video disk comprising a memory for writing a demodulated signal of a channel and reading it with an internal reference clock, and a switching circuit for sequentially switching and reading a reproduced signal of two channels from the memory for each line of a video signal. Playback device. 4. If the horizontal synchronizing frequency of the video signal is fh,
4. The video disk reproducing apparatus according to claim 3, further comprising a filter having a resonance frequency of a frequency fp of fp = (m + 1/4) fh [m: positive integer]. 5. A video disc on which a pilot signal is frequency-multiplexed with a video signal and recorded, wherein a track on which a recording signal on which a pilot signal is multiplexed is recorded and a track on which a recording signal in which a pilot signal is not multiplexed are recorded. A video disc characterized by being formed in parallel and spirally. 6. When recording a pilot signal together with a video signal by frequency-multiplexing, a track on which a recording signal on which a pilot signal is recorded and a track on which a recording signal without a pilot signal are recorded are parallel to each other and spiral. A device for reproducing a video disc formed into a shape,
A photodetector that irradiates two tracks on the video disk with playback laser light and receives the reflected light from each track, an FM demodulator that demodulates the signal reproduced by the photodetector by FM, and one of the tracks. A filter for extracting the pilot signal from the signal, a detection circuit for detecting the presence / absence of the pilot signal, a clock regenerating circuit for regenerating the clock signal from the pilot signal, and a demodulated signal of two channels is written by the regenerated clock to perform internal reference. It is equipped with a memory for reading with a clock and a switching circuit for sequentially switching and reading the reproduction signals of two channels from the memory for each line of the video signal, and the spot of the reproduction laser light is arranged along the track on the video disk. After tracking control, the pilot signal is extracted from the playback signal of the preset channel. A video disc reproducing apparatus characterized in that the detection circuit detects whether there is a pilot signal and jumps to an adjacent track when a pilot signal is not detected. 7. A V having a V-shaped cross section in the radial direction of the disk.
A video disc having a groove, wherein a track on which a recording signal in which a pilot signal is multiplexed and a track on which a recording signal in which a pilot signal is not multiplexed are recorded are formed on the same V groove. disk.