JPS61248687A - Video disk device - Google Patents

Abstract

PURPOSE:To record and to reproduce suitably a composite video signal and a sound signal without interfering mutually with an address signal by constituting a device so that the composite video signal which is FM-modulated is not recorded overlapping on an address signal area and also setting the frequency band area of the address signal higher then that of a modulated sound signal. CONSTITUTION:A means 2 which FM-modulates the composite video signal, means 16-22 which control the rotation phase of a disk so that the vertical blanking period of the composite video signal is recorded on a prescribed position including the address signal, a means which modulates the sound signal to the signal having a lower frequency band area than that of the FM-modulated composite video signal and a means 3 which mixes the FM-modulated composite video signal and the modulated sound signal are provided. Furthermore, with providing a means 23 which prevents the composite video signal that is FM-modulated from being supplied for a prescribed time to the mixing means 3 so that the FM-modulated composite video signal is not recorded at the area where the address signal is performed, and providing means 11-13 which record the signal outputted from the mixing means 3 on an information recording truck, the address signal is set as the signal having a higher frequency band area than that of the modulated sound signal.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention records information on a disc-shaped recording medium (disc),
Regarding a video disc device for reproducing recorded information, in particular, a function of recording a composite video signal and an audio signal on a disc having a spiral or concentric information recording guide track on which an address signal is formed in advance. The present invention relates to a video disc device equipped with.

[Background of the invention]

Conventionally, a light beam such as a laser is irradiated onto a disk in a spiral or concentric pattern to record information such as video signals at high density in binary form such as mechanical unevenness or chemical shading.
There are also optical video disc devices that perform playback.

In this optical video disk device, a carrier signal of an appropriate frequency is FM-modulated with a video signal, this is converted into a binary signal using a limiter, etc., and a light beam is modulated with this binary signal to generate the video signal. is recorded, for example, as a change in recording bit length. Then, during reproduction, the bit length is detected and the video signal is reproduced.

An example of a method for recording an audio signal by superimposing it on a video signal in this optical video disc device is shown in FIGS. 6 and 7.
This will be explained using figures. Examples of this are IEE Transactions on Consumer Electronics, Polymer CEE 29. Number 4.1983
November (IEE Tratyaction)
z on Conzurnar Elact-roni
cz, Vol, CE-29, 814, November
R 1983) ``Digital Audio Modulation Expansion in the Pal and NTC Laser Vision Video Disc Coding Formats J CD Talman'' by Immin, Hoogand and Kahlman.
Aμdi.

Modulation in the PAL a+h
d Shoulder Sc Layervision Video.

This is a recording method for video signals and audio signals announced in ``Disc Coding Formats''.

FIG. 6 shows the frequency spectrum of the signal recorded on the disk, and FIG. 7 is a block diagram showing the schematic configuration of the recording apparatus. According to the above document, as shown in FIG. 6, an NTSC composite video signal consisting of a luminance signal, a chrominance signal, and a synchronization signal is transmitted to an FM wave with a sync chip frequency of 7.6 AfHz and a white peak frequency of 9.5 MHz. Then, the directly FM-modulated signal r (S...synchronization signal e'0...brightness signal and color signal) and the two-channel audio signal are combined with a center frequency of 2.
．． The frequency deviation is ± for 5MHz and 2.8MHz, respectively.
Signal A1 directly FM modulated on FM wave of 1ooKEz
m'G and a signal obtained by pulse width modulating a digital audio signal are superimposed and recorded. Note that J is the primary lower color,
3.

It is a sideband wave.

In FIG. 7, the composite image signal applied to the terminal α is supplied to the 1M modulator 2 via the pre-emphasis circuit l, modulated into an FM wave of the above frequency, and then sent to the mixer circuit 3. .

The first audio signal applied to the terminal is supplied to the 1M modulator 5 via the pre-emphasis circuit 4, modulated into an FM wave with a center frequency of 2.5 MHz, and then sent to the mixer circuit 3. The second audio signal applied to the terminal C is supplied to the 1M modulator 7 via the pre-emphasis circuit 6, modulated into an OFM wave with a center frequency of 2.8 MHz, and then sent to the mixer circuit 3. The third audio signal applied to the terminal d is supplied to the digital encoder circuit 8. This encoder circuit 8 is compatible with currently commercially available compact disc players (reads digital audio signals recorded on discs using a laser beam, performs signal processing such as decoding, and converts the original analog audio signal to the original analog audio signal). A player for playback (hereinafter referred to as a CD player)',
4.

The same circuit as the encoder circuit for isk cutting equipment is used. In this circuit 8, sampling, A/D conversion, error correction processing, E F
M (Eight Fourteen Modulat
ion) The binary signal output after undergoing signal processing such as modulation is sent to the mixer circuit 3 via a low-pass filter circuit 9 with a cutoff frequency of about 175 MHz and a pre-emphasis circuit 10 that emphasizes the low frequency range. Sent.

In the mixer circuit 3, after the FM-modulated composite video signal, first audio signal, second audio signal, and 11M-modulated 3'O audio signal are added, this added signal is The signal is sent to the limiter circuit 11. From the IJ transmitter circuit l], the frequency changes according to the FM' modulation wave of the composite video signal, and the width (i.e., duty) changes according to the sum signal of the first to third plain voice signal modulation waves. A pulse signal is output. □This pulse signal is sent to the optical modulator 12'
By converting the intensity of the light beam into a light beam, focusing the light beam with an objective lens 1 m, and projecting the light beam onto the disk 14, each modulated wave of the frequency spectrum shown in FIG. 6 is multiplexed and recorded.

The above-mentioned literature describes a method of recording a composite video signal with the same specifications as a commercially available video disc device, and also superimposes and records a digital audio signal with the same specifications as a commercially available CD. However, in a video disc device that has not only a playback function but also a recording function, a guide track (information recording track) is formed in advance in a spiral or concentric form, and an address signal is engraved at a predetermined position on this guide track. There is no mention of a video disc device that is equipped with a function to record a composite video signal and an audio signal in a superimposed manner on a disc. Therefore, the problem of mutual interference between the address signal and the composite video signal or audio signal is not mentioned.

Next, a video disc device equipped with such a recording function will be explained.

FIG. 8 is a partially enlarged perspective view of the disk 14, partially cut away and shown in perspective. In the same figure, 27α to 27
f is a guide track formed, for example, in a spiral shape with a width W, a pitch P, and a depth d on the side of the disk 140. Reference numeral 28 denotes a recording surface formed by applying a recording material such as a photosensitive amorphous metal from the planar side.

Further, 29 indicates a substrate. Although not shown, the actual disc 14 is provided with a protective layer or the like on the recording surface 28.

In FIG. 8, the light beam output from the optical modulator 12 of FIG. 7 is filtered by an objective lens 13, and is irradiated from the substrate 29 side as a minute spot light 30. As a result, minute spots are formed on the recording surface 28, and recorded information is accumulated on the recording surface 28 in the form of holes (pits) or blackening.

FIG. 9 fil is a partially enlarged view of any one of the guide tracks 27σ to 27f viewed from the top surface of the disk 14. FIG. Moreover, FIG. 9(2) is a sectional view taken along the line AA' in FIG. 9(1). In FIGS. 9(1) and (2), the same reference numerals as in FIG. 8 indicate the same or equivalent items.

100 is a protective layer. Guide track, 7.

27α to 27f, area 3 where address signals are recorded in advance
1, and an area 32 where no address signal is recorded. In the address signal area 31, address information is formed discretely in a pit structure accompanied by an optical phase change. Note that information such as a video signal is also recorded in the address signal area 31 in an overlapping manner.

Address signals are generally phase encoded (PE)
This is a code signal modulated by modulation or modified FM (MFM) modulation, and is formed in the address signal area 31 of the guide tracks 27α to 27f of the disk 14, as described above. The fundamental wave component of this address signal is set to approximately 275 KHz to 550 KH2, and not only this fundamental wave component but also its third harmonic component has a high level.

Therefore, as is clear from FIG. 6, if an EFM modulated audio signal of the CD system is recorded in the address signal area 31 in an overlapping manner, interference will occur due to the fundamental wave component and harmonic component of the address signal previously formed on the disk 14. Accordingly, the above E
FM modulated, 8.

The audio signal is corrupted and the quality of the reproduced audio becomes very poor.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to record a composite video signal and an audio signal on a disc on which an address signal has been formed in advance, without mutual interference with the address signal. The goal is to provide equipment.

[Summary of the invention]

To achieve the above object, the present invention provides a video disc device for recording composite video signals and audio signals on a disc in which information recording tracks on which address signals are formed in advance are formed in a spiral or concentric form. means for FAI modulating the composite video signal; and means for controlling the rotational phase of the disk so that the vertical blanking period of the composite video signal is recorded at a predetermined position including the address signal;
the audio signal is lower than the FM-modulated composite video signal;
means for modulating a signal having a wide frequency band;
means for mixing the modulated composite video signal and the modulated audio signal; means for preventing the modulated composite video signal from being supplied to the mixing means;
Means for recording the signal output from the mixing means on the information recording track is provided, and the address signal is formed with specifications to be a signal of a higher frequency than the frequency band occupied by the modulated audio signal.

[Embodiments of the invention]

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a block diagram of an optical video disc device showing one embodiment of the present invention. FIG. 2 is a plan view of the disc 14 showing an example of address signal recording areas 31α, 31h, vertical synchronizing signal recording areas 33g, 33A, and V mark signal recording area 34 of the disc 14. Third
The figure shows a frequency spectrum of a signal recorded on the disc 14.

FIG. 4 is a timing chart for explaining the operation of FIG. 1.

First, the operation during recording will be explained.

In FIG. 2, the disk 14 is rotated at 1800 rpm in the direction of the arrow so that one frame of composite video signal is recorded in one rotation. Then, the address signal area 31α, 3
1h are provided at two locations facing each other and 180 degrees apart. Furthermore, an uneven surface, for example, is formed at a predetermined position on the inner peripheral portion of the disk 14 as V mark information.

During recording, the vertical synchronization signal of the composite video signal is placed at positions 33α and 33h immediately before the address signal area 31°, as shown in FIG.
This address signal area 31a, 31h
is within the vertical retrace period of the video signal.
Controls the 40 rotation phase. For this purpose, in FIG. 1, the output of the optical sensor 15 is amplified and shaped by the r mark signal detection circuit 16, and the signal VM that detects the r mark information engraved on the disk 14 [FIG. 4 (3)] obtained, disk 14
Detect the rotational phase of (The light beam emitted from the optical sensor 15 hits the disk 14 and is reflected, 11.

is detected by the optical sensor 15. A V mark signal is obtained by detecting the diffused reflection caused by the unevenness of the r mark surface. ) On the other hand, terminal α
The vertical synchronization signal detection circuit 17 generates a 60 Hz vertical synchronization signal VF [Fig.
l)]. This vertical synchronization signal VF is divided into frequency dividing circuit 1.
Signal VD divided by 8 to 1/2 frequency (30Hz)
4(2)] is sent to the phase comparator via the switch 19 which is switched to the REC terminal side during recording. In the phase comparator 20, this 1/2 frequency-divided vertical synchronizing signal VD,
The phase is compared with the nine r mark detection signal VM described above, and the phase error signal is sent to the motor drive circuit 21 to control the rotational phase of the spindle motor 22. As a result, the disk 14 rotates in phase synchronization with the vertical synchronization signal of the composite video signal to be recorded, and the vertical synchronization signal is placed at a predetermined position 33 immediately before the address signal area 31a, 31A as shown in FIG. tL, recorded at 33A. Note that a speed control system that detects the rotational frequency of the spindle motor 22 and controls the rotational speed to be constant is also used, but this is not shown.

In this manner, the composite video signal and the audio signal are recorded while the disk 14 is rotated in synchronization with the vertical synchronization signal to be recorded. The audio signal is recorded using the same digitization method as the sixth audio signal in the conventional example shown in FIG.

That is, in FIG. 1, the audio signal applied to terminal d is supplied to the digital encoder circuit 8. In FIG. In this circuit 8, the binary signal output after undergoing signal processing such as sampling, AD conversion, error correction processing, and EFM modulation according to the specifications of the current CD system has a cutoff frequency of approximately 1.7.
The signal is sent to the mixer circuit 3 via a 5 MHz low-pass filter circuit 9 and a pre-emphasis circuit 10 that emphasizes the low frequency range. Therefore, this digital audio signal is recorded on the disk 14 as a signal in a low frequency range up to about 1.75 KHz, as shown in FIG.

Next, in FIG. 1, the Nrsc type composite video signal applied to terminal a is supplied to the 1M modulator 2 via the pre-emphasis circuit I, and the sync chip frequency is Z6M.
Hz, and is modulated into a 1M wave with a white peak frequency of 9.3MHz, and then sent to the mixer circuit 3 via the squelch circuit 23.
sent to.

After the FM-modulated composite video signal and the EFM-modulated audio signal are added in the mixer circuit 3, this added signal is sent to the limiter circuit 1. The limiter circuit H outputs a pulse signal whose frequency changes according to the 1M wave of the composite video signal and whose width (that is, duty) changes according to the EFM modulated wave of the audio signal. This pulse signal is sent to the optical modulator 12 and converted into the intensity of the light beam,
The light beam is reflected by an objective lens 13 and irradiated onto a disk 14 . As a result, the FM modulated wave V of the composite video signal and the EFM modulated wave of the audio signal shown in FIG.
It is multiplexed into 4 and recorded. Note that J is a first-order lower color sideband wave. Further, illustration and description of the focus control device and the tracking control device will be omitted.

As mentioned above, the disk 14 has PE modulation or M
A code signal modulated by FM modulation is used as an address signal N,
The address signal areas 31α and 31h shown in FIG. 2 are carved in advance. In the address signal areas 31α and 31h, an audio signal EFM-modulated using the CD method is recorded superimposed on the address signal N. In this case, in order to prevent the voice signal from being interfered with by the address signal N, the frequency of the address signal N is set to approximately 1
．． Set the frequency to be sufficiently higher than the frequency of the audio signal, which has a band of up to 75 MHz. FIG. 6 shows an example in which the center frequency of this address signal N is set to 6.5 MHz.

In this way, if the frequency of the address signal N is made sufficiently higher than the EFM modulated wave of the digital audio signal, mutual interference between the audio signal and the address signal N will disappear, but the FM modulated wave of the composite video signal V Mutual interference between the address signal N and the address signal N becomes a problem. That is, since the frequency of the address signal N and the frequency of the composite video signal V are close to each other or in the same band, it is inevitable that they will interfere with each other if they are recorded in a superimposed manner.

Therefore, in the embodiment shown in FIG. 1, the FM signal of the composite video signal is
To prevent a modulated wave V from being recorded in a superimposed manner. For this purpose, the squelch signal forming circuit 24 converts the r mark signal VM output from the V mark signal detection circuit 16 into the fourth
As shown in the figure, by delaying by a predetermined time TItTl+,
A squelch signal SQC (FIG. 4(4)) which becomes high level during the period when the light beam formed by the objective lens 13 passes over the address signal areas 31α and 31h is formed. This squelch signal SQ is supplied to the squelch circuit 23, and the transmission of the composite video signal FM-modulated by the 1M modulator 2 is configured to be prohibited during the period when the squelch signal SQ is at a high level. The squelch circuit n outputs an FM modulated wave of the composite video signal whose transmission is prohibited for a predetermined period, as shown in FIG. 4(5), and sends it to the mixer circuit. As a result, the FM modulated wave of the composite video signal is no longer recorded in the address signal areas 31α and 31b, so mutual interference between the address signal N and the composite video signal is completely eliminated.

It will be done. In the squelch signal forming circuit, instead of delaying the r mark signal VM to form the squelch signal SQ, the vertical synchronizing signal VF of +71 in FIG. 4 is delayed for a predetermined time TA.
The squelch signal SQ may be formed with a delay of +T4.

Further, +71 and +81 in FIG. 4 are timing charts showing an example of the phase relationship between the composite video signal and the address signal (code), and the 11th period and the T2 period are periods in which the vertical synchronization signal exists. For example, the picture stop code PS is recorded in the 16th horizontal line and the 17th horizontal line of the 1st field shown in (8), the chapter number code CM is recorded in the 18th horizontal line, and the 274th horizontal line of the 2nd field shown in (8) is recorded. white flag FF, frame number code FN for 280 horizontal line and 281 horizontal line
is recorded. These codes are recorded as digital codes within predetermined horizontal scanning lines during the vertical blanking period of the video signal. Therefore, in order to prevent mutual interference between these address signals (codes) and the composite video signal without damaging the horizontal synchronization signal, it is necessary to use the squelch signal SQ shown in 61 for the first field shown in 71. , (8) K
The squelch signal S shown in 9) for the second field shown in
Q must be used.

Next, the configuration of the device for reproducing signals from the disk 14 is as follows.
A brief explanation of the first drawing will be provided.

During reproduction, the switch 19 is switched to the PR terminal side, and the 3QHz reference signal generated by the reference signal generator 44 is supplied to the phase comparator 20. The phase comparator compares the phases of this reference signal and the r mark detection signal rM, and sends the phase error signal to the motor drive circuit 21 to control the rotation of the spindle motor 22. With this phase control system,
The disc 14 has a frequency of 30Hz (1800r7m), same as when recording.
) is controlled to rotate. Furthermore, spindle motor 2
The speed control system in Figure 2 is used in the same way as during recording.
The illustration and explanation will be omitted.

During reproduction, a weak light beam of constant intensity is irradiated from the optical modulator 12 onto the disk 14 through the objective lens 53, and the transmitted light from the disk 14 is supplied to the photoelectric converter 25. In this case, the reflected light from the disk 14 is
It may also be supplied to the photoelectric converter 25.

The photoelectric converter 25 generates an electric signal depending on the intensity of the transmitted light, and supplies this to the preamplifier 26 . The reproduced signal output from the preamplifier 26 is generated by a 1M compensator 35 due to deviations in the recording/reproducing characteristics of the disk 14, deviations in the MTF characteristics of the objective lens 13, changes in recording wavelength depending on the radial position of the disk 14, etc. After compensating for changes in the overall frequency characteristics, the signal is sent to the bandpass filter circuit 36. After separating the FM-modulated composite video signal components in the bandpass filter circuit 36, the FM demodulator 37
The signal is demodulated and the frequency characteristics are further corrected by a de-emphasis circuit 38 to obtain a desired reproduced composite video signal in the terminal sense.

On the other hand, the reproduced signal output from the preamplifier section is sent to a low-pass filter circuit 39, where only the low-frequency EFM-modulated digital audio signal component is extracted, and a de-emphasis circuit 4o converts the frequency and 19° frequency characteristics. is corrected, the digital decoder circuit 41
sent to. In this digital decoder circuit 41, 11M demodulation, error correction processing, DA
Signal processing such as conversion is performed, and a desired reproduced analog audio signal is output to terminal f.

Further, the reproduced signal output from the preamplifier 26 is sent to a bandpass filter circuit 42. The bandpass filter circuit 42 extracts only the frequency component of the address signal recorded in advance on the disk 14 and supplies it to the address signal extraction circuit 43. In the address signal extracting circuit 43, for example, the r mark detection signal V is detected in the squelch signal forming circuit U.
In response to the squelch signal SQ generated from M, the gate is closed only during the address signal period, and a desired reproduced address signal is outputted to the terminal l.

In addition, in FIG. 3, the address signal N may be selected to have a frequency intermediate between the EFM modulated wave of the digital audio signal and the first-order lower color sideband wave J1. For example, if 2.5 MHz is selected, the 6th frequency Audio message shown in figure 20.

Since it has the same frequency as the FM modulated wave A of the above-mentioned number, it is possible to reproduce and separate it as shown in the above-mentioned document.

Next, another embodiment of the present invention will be described using FIG. 5.

FIG. 5 is a diagram for explaining a signal multiplexing format in a system called MUSE, which compresses and transmits a high-quality television signal.

Research is being carried out on high-definition television systems that have significantly improved resolution compared to current standard television systems, such as the NTSC system. As the quality increases, the necessary transmission bandwidth increases, and therefore, technology for compressing the video signal band is required for practical use. In this regard, MUSE (MUSE) has recently been developed as an effective technology to significantly compress the bandwidth.
ltipl-5ub-Nyquist Samplin
g Encoding ) method was proposed.

The contents of this Muse method are available in NHK Giken Monthly Report 27-7.
(1984) by Ninomiya in ``A New Transmission Method for High-Definition Television ~MUSE~''. According to this document, there are two color signals (C video) divided into low and high frequencies.
is time-division multiplexed with the luminance signal (Y video) alternately and line-sequentially every horizontal period, and the horizontal synchronizing signal HD and frame pulse signal FP are at a level that does not exceed the maximum amplitude of the luminance signal and color signal, so-called Multiplexed with positive polarity. The frame frequency is 3QHz, and the number of horizontal scanning lines in the frame periodic box is 1125.

Looking at the muse signal format in Figure 5, from line 6 to 43
The 38 lines up to this line and the 37 lines from the 568th line to the 604th line are a period in which audio signals and various additional information are not recorded, and are part of the vertical blanking period.

This audio signal is a digitized and time-base compressed signal.

This high-definition television signal of the Meese system is transmitted to the disk 14.
The present invention can also be applied to the case where information is recorded on an information recording track on which an address signal is previously formed. That is, a signal obtained by FM modulating the Muse method signal shown in Fig. 5 (however, the audio signal is not multiplexed in the vertical blanking period) and a CD described in Fig. 1 in which the audio signal in the vertical blanking period is deleted. The digital audio signal of the
A squelch circuit is provided to record the FM modulated signal in an overlapping manner and to prohibit transmission of the FM modulated signal for a predetermined period so that the FM modulated signal is not recorded in the address signal area.

In this case, the rotational phase of the disk 140 is controlled so that the address signal area corresponds to the period of additional information shown in FIG. For this phase control, a signal obtained by detecting a 30 Hz frame pulse BP is used instead of the 50 Hz vertical synchronizing signal rD whose frequency is divided by 2 as shown in Fig. 1, and this FP detection signal and r mark detection signal are used. The rotation of the spindle motor 22 is controlled according to the phase difference with the VM.

In FIG. 5, by using a phase-locked loop circuit to detect the horizontal synchronizing signal HD of positive polarity, there is no problem even if the horizontal synchronizing signal HD in the additional information period is deleted. In this way, by deleting the horizontal synchronization signal H1) in the additional information period, there is no need to worry about the horizontal synchronization signal HD detection malfunctioning with the address signal, so the address signal area can be widened, and the transmission of the FM modulated signal can be The pulse width of the inhibited squelch signal can also be made sufficiently wider than the address signal area, which is convenient because there is a margin for the squelch operation.

Furthermore, in the above embodiment, the audio signal is digitized and the EF
Although we have described the case of recording with M modulation, the present invention is not limited to this, but also applies to the case of modulating the audio signal with various modulation methods so that it becomes a signal in a frequency band lower than the band of the FMK-modulated composite video signal. The present invention is also applicable.

〔Effect of the invention〕

As described above, according to the present invention, the FM-modulated composite video signal is prevented from being recorded over the address signal area, and the address signal has a higher frequency than the frequency band of the modulated audio signal. It becomes possible to record and reproduce a composite video signal and an audio signal at an appropriate angle of 24° without mutual interference with the address signal on the information recording track of the disk on which the address signal is partially formed in advance.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an optical video disc device showing an embodiment of the present invention, Fig. 2 is a plan view of the disc showing the recording area of address signals and vertical synchronization signals, and Fig. 6 is a block diagram of an optical video disc device showing an embodiment of the present invention. Spectrum showing one example of a signal, 4th
1 is a timing chart for explaining the operation of the device shown in FIG. 1, FIG. 5 is a signal format diagram for explaining another embodiment of the present invention, and FIG. 6 is a conventional example of a signal recorded on a disk. FIG. 7 is a block diagram showing a conventional example of a video disc recording device, FIG. ) is a partially enlarged plan view of one of the information recording tracks of the disk, and FIG. 9(2) is a sectional view taken along the line A--AI in FIG. 9(1). 2...FM modulator 3...Mixer circuit 8.
...Digital encoder circuit 14...Disk 15...Optical sensor 16
... r mark signal detection circuit 17 ... vertical synchronization signal detection circuit 18 ... branch circuit addition ... phase comparator 21
...Motor drive circuit 22...Spindle motor 23...Squelch circuit A...Squelch signal forming circuit 27α-rnf...Information recording track 31.31α,
31b...Address signal area 33α, 33b...Vertical synchronization signal recording area, 27. -N η size ψ
To Kaku ■＋7
+-′ +J
+7 recognition # Δ

Claims (1)

[Claims] 1. A disk-shaped recording medium in which information recording tracks on which address signals have been formed in advance are provided in a spiral or concentric shape;
a first modulating means for FM modulating a composite video signal including a synchronization signal, and a vertical blanking period of the composite video signal,
control means for controlling the rotational phase of the disc so that the audio signal is recorded at a predetermined position containing the address signal formed in advance on the disc; a second modulating means for modulating the FM-modulated composite video signal and the modulated audio signal, a second modulating means for modulating the FM-modulated composite video signal into a signal having at least the address signal; blocking means for preventing the FM-modulated composite video signal from being supplied to the mixing means for a predetermined period so that the FM-modulated composite video signal is not recorded in the area where the FM-modulated composite video signal is formed; recording means for recording on the information recording track of the disc, wherein the address signal is a signal formed on the information recording track of the disc as a signal having a higher frequency than the frequency band occupied by the modulated audio signal. A video disc device characterized by: