JPS604631B2 - Television signal recording method for rotating recording media - Google Patents

Description

[Detailed Description of the Invention] In recent years, there has been research and development on recording and reproducing information signals that occupy a wide frequency range for recording and reproducing various information signals, and efforts have been made to record and reproduce information signals with high recording density on information recording media. Research and development on so-called high-density recording, which records and plays back, has become more active, and high-density recording of information signals is being carried out using disc-shaped or cylindrical information recording media, that is, rotating recording media. It is well known that a large number of various recording and reproducing methods for reproduction have been proposed, and among them, a disc-shaped rotating recording medium (disc-shaped information recording medium...hereinafter abbreviated as disk) is widely known. Various methods for high-density recording of information signals and their reproduction using the following methods are reaching the stage of practical use.

By the way, when the main information signal to be recorded and reproduced by a rotating recording medium is a television signal (hereinafter, television is referred to as TV), the rotation period of the rotating recording medium is the target for recording and reproduction. TV that should be recorded and reproduced in the recording trace formed on the rotating recording medium by one revolution of the rotating recording medium as an integral multiple of the field period (vertical scanning period) in the TV signal that should be
Normally, a signal is recorded that corresponds to a time length that is an integral multiple of one vertical scanning period of the signal, but the rotation period of the rotating recording medium is set to the vertical direction of the TV signal to be recorded and reproduced. If it is set equal to the scanning period, the number of revolutions of the rotating recording medium will be extremely high, which not only poses safety issues, but also may cause vibrations and require high precision for the rotating recording medium. The rotation period of a rotating recording medium is limited to a Such a method allows signals of a plurality of vertical scanning periods (a plurality of field periods) of a TV signal to be recorded and reproduced to be recorded in a record trace formed on a rotating recording medium by one revolution of the recording medium. If we look at the publicly known recording and reproducing methods that have been announced so far, we can see that in many of the previously announced recording and reproducing methods for TV signals using discs, the recording trace during one rotation of the disc is A TV signal for two vertical scanning periods is recorded in a disc, and a grooved disc is used to extract information signals from the recording trace by detecting changes in capacitance. In this known system, TV signals for eight vertical scanning periods are recorded on a recording trace during one rotation of the disk. In the above-mentioned method for recording and reproducing TV signals using a disk, the number of revolutions of the disk when recording and reproducing a TV signal that follows a scanning standard in which one field is 1/6 sand is 180. In the latter method, it is 45 pm.

When the disk rotation speed is high, the various problems mentioned above occur, so it is desirable to set it low in order to solve the problems mentioned above. A decrease in the rotational speed of the disc causes a shortening of the recording wavelength of the recorded signal on the disc, which causes the problem that the information signal cannot be read from the disc if the reading resolution of the reproducing element is low. Another problem is that it is not possible to use an inexpensive recording device that uses laser light beams when recording information signals on the master disk, and the same recorded trace is repeatedly played back during playback, resulting in a stationary state. Inconveniences also arise when attempting to obtain images.

If the playback device is an optical playback device, the diameter of the light spot that is irradiated onto the disk to collect information signals from the disk depends on the wavelength of the light emitted from the light source used. Therefore, if the recording wavelength of the recording signal on the disk is shortened due to a decrease in the rotational speed of the disk, the information signal on the disk cannot be captured.

For this reason, in optical recording and reproducing systems, the disk is usually rotated at a relatively high rotational speed so that one frame (two fields) of TV signal is recorded in the recording trace during one rotation of the disk. This causes the various problems mentioned above.

On the other hand, in a recording/reproducing method in which information signals from a disk are exchanged by detecting changes in capacitance, the thickness of the electrode of the playback needle that slides into contact with the disk and reads the information signal must be made thinner. Therefore, even if the recording wavelength of the recording signal on disk H becomes shorter due to a decrease in the rotational speed of the disk, information signals from the disk can be exchanged without any problem. , 4 frames (8 frames) are recorded during one rotation of the disk.
Some discs have also been announced that rotate the disc at a low rotational speed so that TV signals (field) can be recorded.

If the rotational speed of the disc is lowered in this way, desirable results such as being able to lengthen the playing time of the disc (increasing the recording capacity of the disc) and reducing wear on the playback stylus that supports the disc are achieved. is obtained, but
The drawback is that an inexpensive recording device using laser light cannot be used for recording, and an expensive electron beam recording device is required for recording information signals. Furthermore, if the disc is of a grooveless type, it is possible to rapidly move the reproducing element in the vertical direction of the disc when reproducing information signals from the disc. In addition to being able to access signals randomly, the playback mode can also be set to still image playback mode, slow motion playback mode, and various other playback modes, making the information signal recording and playback device using a disk suitable for many purposes. This has the advantage that it can be used for

As a result of considering the advantages and disadvantages of various information signal negotiation methods, the advantages and disadvantages of different disk configurations, and many other conditions, the applicant company can easily obtain stable playback results. Moreover, we can provide playback equipment at low cost,
In addition, as a method for recording and reproducing information signals using a disk that also allows searching for various information signals, information signals from the disk are read by detecting changes in capacitance value, and the disk is made of a grooveless type. Further, it is assumed that two frames (four fields) of a TV signal to be recorded and reproduced exist in the recording trace formed during one rotation of the disk, and furthermore, We are promoting development research and practical research on a system that allows the playback needle to accurately track the recorded trace under tracking control, and have achieved great results so far. He has also filed numerous patent applications.

This method of recording and reproducing information signals on discs by the applicant company uses a non-grooved disc, which allows for random access as well as playback of electrostatic images, slow motion images, etc. So-called trick play is also possible, and since the disc is driven and rotated at a relatively low rotational speed, wear of the playback stylus is not a major problem, and the recording capacity is sufficient, and the disc Real-time recording of information signals is possible using an optical recording device using a laser beam, and it is also superior in several respects, such as the fact that deformation that occurs during disk manufacturing and storage has little effect on playback operations. It is something that

However, since the TV signal recorded during one rotation of the disc consists of 2 frames (4 fields), the portion where the image content of the TV signal recorded on the disc changes and the switching of reference symbols for tracking control. If a portion is recorded in an unrelated state, for example, when the information signal of that portion is reproduced as a still image, the still image may be reproduced in a state in which two image contents are mixed.

A concrete explanation of this is as follows. That is, in FIG. 1, Fa,, Fa2..., Fb,, FQ...F
c,, Fc2, etc. are each one field period (one vertical scanning period) recorded sequentially in the recording trace of the disk ○.
, and the above-mentioned TV signal Fa, , Fa2
The subscripts (a, b, c) in ... etc. are used to distinguish between TV signals of different programs (different image contents, e.g. baseball, volleyball, swimming, etc.), and furthermore, The subscript numbers in Fa, Fa2, etc. indicate the order of field signals according to each program, and as this disk D rotates in the direction of the arrow Assuming that the signal is to be reproduced, let's assume that the information signal recorded on this disk D is to be reproduced in still image reproduction mode. A still image does not necessarily depend only on the image content. In the still image playback mode, it is necessary for the playback stylus to repeatedly play back the information signal from the same recording trace formed in correspondence with one rotation of the disk; The TV signal with a 4-field period is
A TV signal in which four fields of image content of the same program are repeatedly played depending on the path followed by the playback needle when playing still images from disk D. In some cases, the image contents of two programs may appear superimposed in one still image.

To specifically explain the above points regarding Fig. 1, the arrow ×
The reproduction needle for reproducing information signals from the disc D rotating in the same direction moves in the outer circumferential direction of the disc D every rotation of the disc D so that the same recording trace can be repeatedly reproduced in the still image reproduction mode. The locations that are driven and displaced by one track pitch are switching locations for reference signals for tracking control, and these locations are a-○, b-10, c10, on disk D in FIG. Which of the four locations corresponding to the four radii indicated by d10 is determined by the setting of the switching timing of the reference signal for tracking control when recording the information signal on the disk, so the above-mentioned tracking The timing of switching the reference signal for control is based on the disk radius a-○ in Figure 1.
, b-○, c-○, or d-○,
The still image reproduction signal to be reproduced is, for example, Fa,, Fa.
2, Fa3, Fa4 (if the signal switching position is radius a-0), Fa2, Fa3, Fa4,
Fb, is repeated (signal switching position is radius b)
-○), Fa3, Fa4, Fb,, Fb2 line return (when the signal switching position is radius c-○)
, or the lines of Fa4, Fb,, FQ, and FA are switched (if the signal switching position is at radius d-○).In the above example, the still image signal from the TV signal of the same program is obtained. This occurs only when the playback needle is displaced by one track pitch toward the outer circumference of the disk at the radius a-○ of the disk ○ for each rotation of the disk D. In other cases, the two programs This results in a mixture of completely different image contents, and it is clear that still image reproduction is of no use in this case.

The above problem also occurs when still images are reproduced by recording address signals on the disk and searching for information. The present invention has been made to solve the above-mentioned problems, and the specific details of the method for recording TV signals on a rotating recording medium of the present invention will be explained below with reference to the accompanying drawings.

FIG. 2 is a block diagram showing an embodiment of the TV signal recording method for a rotating recording medium according to the present invention, in which laser light from a laser light source 1 is applied to an optical modulator 3 via a reflecting mirror 2. Here, the laser beam drift is removed, laser noise is removed, and the amount of light is controlled in the radial direction of the disk master Da, and then the light is applied to the optical modulator 4 via the half mirror 12. The intensity is modulated by the signal to be recorded and reproduced, and then the intensity is modulated by the signal to be recorded and reproduced onto the photoresist layer of the master disc Da of the disc via the reflecting mirrors 5, 6 and the objective lens 7. image a small diameter light spot.

The master disk Da of the disk is rotated by the motor M at 900 revolutions per minute.
A 2-frame period (4-field period) signal of a TV signal that follows the 0-field scanning standard is used as a disc master Da.
It will be recorded in the record trace formed by one rotation of .

The modulation signal given to the optical modulator 4 is the output signal of the adder 11, and the output signal of this adder 11 is the pilot signal fp3 (this The pilot signal fp3 is used as a reference signal for the rotational phase of the disc, as a timing signal for switching between the two tracking signals fp, fp2, and as a timing signal for switching the program of the TV signal to be recorded and reproduced. , which is also used as a reference signal for switching signals of each two frames of a TV signal to be recorded and played back), and a TV signal edited into a TV signal in units of two frames by an electronic editing device EC. and an FM modulated wave from the FM modulator 10 based on the audio signal accompanying the TV signal, an address signal from the address signal generator 9, and the like.

The relative relationship on the time axis of each of the above-mentioned signals constituting the modulation signal supplied to the optical modulator 4 is as follows:
TV edited in units of frames (4 fields)
Just as the pilot signal fp3 exists at a specific position in the vertical blanking period immediately before the video signal of the first field of the first frame in the signal, the vertical blanking period for each field is It is as if an address signal (for example, 40 bits) exists within each period.

Now, in FIG. 2, the laser beam reflected by the half mirror 12 is applied to the reference signals fp, , fp2 ( After receiving intensity modulation by pilot signals fp,, fp2),
A light spot with a minute diameter is imaged onto the photoresist layer on the master Da of the disk through the reflecting mirror 14, the deflecting prism 15, the reflecting mirror 6, the imaging lens 7, and the like.

The two pilot signals fp, fp2 described above may be sent out in the form of a continuous signal or may be sent out in the form of an intermittent signal, but in either case. To ensure that the presence of the pilot signal does not cause beat interference or other negative effects on the main information signal, care must be taken in determining the signal level of the pilot signal and the insertion position on the time axis of the pilot signal. .

The two pilot signals fp, fp2 used as reference signals for the tracking control mentioned above and the pilot signal fp3 used as the reference signal for the rotational phase of the disk mentioned above are connected to the terminal 16 in the example shown in the second diagram.
The color subcarrier (with a frequency value of 3.579549)
M) is obtained by dividing the frequency by frequency dividers 17 to 19.

The fractional display shown in each frequency divider 17 to 19 in FIG. 2 is an example of the frequency division ratio in each frequency divider 17 to 19. If the frequency dividers 17 to 19 each have a frequency division ratio as shown in the figure, the frequency value of each pilot signal obtained from each frequency divider 17 to 19 is such that the pilot signal fp is 715.90. Hz, pilot signal fp2 is 511.36357K
pilot signal fp3 is 275.34961KH
It becomes z. As mentioned above, each pilot signal fp, ~fp
If the frequency value of 3 is associated with the frequency value of the chrominance subcarrier, an advantage is obtained that the presence of the pilot signal can reduce the extent to which it adversely affects the main information signal.

FIG. 3 is a frequency allocation diagram showing an example of the relationship between the occupied frequency band F by the main information signal and each pilot signal fp, to fp3.

In the recording system shown in FIG. 2, pilot signals fp·,f
p2 is alternately supplied to the adder 26 by the switching circuits 22 and 21 in synchronization with the rotation of the master disc Da, and the master disc Da has spiral or circular recording traces caused by the TV signal and the above. A pilot signal f is placed between two adjacent recording traces of the TV signal.
A spiral or circular trace is formed by p, , fp2.

Switching of each of the switching circuits 21 and 22 is controlled by control signals applied to terminals 24 and 25.

FIG. 4 is an explanatory diagram showing a model of the state of recording traces on a disc ○ created based on the master disk Da of the disc on which information signals have been recorded by the recording system shown in FIG.
In FIG. 4, FR, FR2, etc. indicate the signals of each frame of the TV signal recorded on the disc D, and the subscripts 1, 2, . . . indicate the order of the frames.

In FIG. 4, pilot signals fp3 are recorded side by side on a specific radius of the disk ○, and a vertical line erasure period precedes the video signal of each field in the TV signal of the sequentially recorded frames. are also positioned so as to be aligned in a specific rearward direction of the disk D, respectively. Address signals are recorded at specific positions within each vertical women's erasure period, and TV signals for each two frames in each recording trace formed by each rotation of the disk D are recorded. In this case, the field signal that includes the pilot signal fp3 during the blanking period preceding the video signal is always the first field signal in a particular frame. In addition, if the signal recorded on the disc D is a signal used to reproduce a still image, the T
1 from the position of pilot signal fp3 when editing the V signal.
In the recording trace formed by the rotation, field signals having the same image content are repeated four times and recorded.Furthermore, TV signals of different programs are recorded consecutively in chronological order. When the TV signal is edited in the electronic editing system EC, the TV signal of the first field of the first frame of the TV signal of each different program is used as the pilot signal fp3.
This allows recording to begin immediately after the recording position. As is clear from FIG. 4, the pilot signals fp, fp2 for tracking control are sequentially and alternately switched every rotation of the disk D with the recording position of the pilot signal fp3 on the disk D as a reference. Pilot signals fp,
, fp2, recording traces Tfp, , Tfp2 are sequentially formed.

In this way, the TV signal recorded on disk D,
The two pilot signals for tracking control are:
In both of these methods, the time position of the pilot signal fp8 is used as the recording timing reference, and for this reason, even if a still image is played back when playing back the disc D, the above-mentioned problems occur. There isn't.

Next, the structure of the modulation signal supplied from the adder 11 to the optical modulator 4 will be explained.

In FIG. 2, reference numeral 8 denotes an information signal source, and this information signal source 8 is, for example, a TV camera, VTR, or other video signal generating device. Accompanying audio signals etc. are output. The electronic editing device EC stores signals of the first field of each two frames of the TV signal supplied from the information signal source 8 at a specific radial position on the master Da of the disc (a radius where the pilot signal fp3 is aligned and recorded). Electronic editing is performed on the signal in the state that is recorded following the position), and the audio signal accompanying the TV signal is outputted as being in the state accompanying the TV signal.

Now, when the electronic editing device EC electronically edits the TV signal sent from the information signal source 8 into a TV signal in a signal format suitable for playing still images on the disk D, the electronic editing device EC The signal of one field period of the TV signal supplied to the TV is returned four lines to make a TV signal of two frame period, or the TV signal of one frame period obtained from a still image is returned two lines to make a TV signal of two frame period. For example, the master disc D
In the case where a TV signal for still image playback having different image contents is recorded for each recording trace formed by each rotation of a, two frame periods each having different image contents are recorded. The TV signals for still image reproduction are recorded on the master disc Da as TV signals that are continuous on the time axis.

In addition, if the TV signal recorded in detail on the disc is one in which TV signals from multiple programs appear sequentially on the time axis, all the TV signals for each program are divided into integral multiples of two frame periods. In addition, the first field of the TV signal of the first two frame periods of the TV signal of each program is necessarily aligned on a specific radius on the master disc Da of the disc. Pilot signal fp recorded in
This will cause it to be recorded immediately after 3.

As described above, in the TV signal recording method for the rotating recording medium of the present invention, the TV signal recorded on the master disk ○a is made up of two frame periods of TV signals, and the first part of each unit of TV signals is field tv
The signal is always recorded following the pilot signal fp3, which is recorded aligned on a specific radius on the master disc Da of the disc. The TV signal from the electronic editing device EC and the audio signal accompanying the TV signal are given as modulation signals to the FM modulator 10,
The FM modulated wave output from the FM modulator 10 is sent to the adder 11
, the pilot signal fp3 received from the switching circuit 20 and the address signal from the address signal generator 9 are added together and sent to the optical modulator 4.

Pilot signal fp3 added in adder 11
In the adder 11, the video signal of the first field of the first frame in each unit of the TV signal of two frame periods as described above is supplied from the electronic editing device EC. The timing and time length of the transmission are determined by the switching circuit 201 so that the signal is superimposed on the TV signal at a specific time position within the immediately preceding vertical blanking period, and the above switching operation of the switching circuit 20 is as follows. , its control Satoko 23
controlled by a control signal applied to the Further, the address signal added to the TV signal in the adder 11 is controlled by the electronic editing device EC so as to be inserted at a specific time position within each vertical female line erasure period of the TV signal. 5A to 5E are waveform diagrams for explaining the operation of the recording system, and FIG. FIG. 5b is a diagram showing the insertion position (in order to facilitate understanding, the TV signal is shown as a video signal); FIG.
It is a waveform diagram of a control signal applied to the control terminal 23 of
FIG. 5c is a waveform example of the pilot signal fp3 sent from the switching circuit 20, FIG. 5d is a waveform example of the control signal supplied to the control terminals 25 and 24 of the switching circuits 22 and 21, and FIG. Figure e shows the switching circuit 22,
21 is a waveform example diagram of pilot signals fp, fp2 sent out from 21. FIG.

In FIG. 4, a model is shown in which the form and recorded content of the recording traces of the disc D created based on the master disk Da on which information signals are recorded by the recording system shown in the second diagram described above are clearly shown. Vb〆W is the recorded portion of the direct blanking period, Bv is the recorded portion of the vertical synchronization signal, fp3 is the recorded portion of the pilot signal fp3, and Sad is the recorded portion of the address signal. Arrow X indicates the direction of rotation of the disk. FIG. 6 is a block diagram showing an example configuration of a reproduction system, in which the disk D is rotated at a rotation speed of 900 revolutions per minute in the direction of the arrow X in the figure by a rotation drive mechanism (not shown), and the upper surface of the disk D is A reproducing needle 33 that detects the information signal of the disk D as a change in capacitance is in contact with the disc D with a predetermined pressing force, and the information signal read by the reproducing needle 33 is applied to the front layer amplifier 36. It will be done. 34 is a cantilever, and 35 is a tracking control drive mechanism for driving and displacing the reproducing needle 33 in the middle direction of the recorded trace.

The tracking control disturbance mechanism 35 can cause the playback needle 33 to move in the middle direction of the recording trace according to the tracking control signal, and at the same time drive and displace the playback needle 33 in the extending direction of the recording trace according to the jitter correction signal. A drive mechanism like (
For example, it is a desirable mode of implementation to provide the following specification (see the specification of Tokurinin Sho 52-12228). As the regenerative needle 33 equipped with an electrode for information signal discussion, for example, Hakama Gansho 5
No. 1-1137216, Mochiiso Sho 52-Shige No. 7 can be used successfully.

The signal received by the reproduction needle 33 and amplified by the front layer amplifier 36 is a frequency modulated wave by the main information signal (frequency band in FIG. 3), as shown in the frequency map shown in FIG. 3. occupies Castle F} and pilot signals fp, to fp3, the main information signals are given to the signal processing circuit 38 via the Takagi Kashiwa device 37, and the signal processing circuit 38 performs the necessary signal processing. and output terminal 39
Main information signals to be recorded and played back {for example, composite color video signals and audio signals accompanying them}
At the same time, the pilot signals fp, ~fp3 are sent to the automatic gain control circuit 41 (AGC circuit 4
1), and the output signal from this AGC circuit 41 is applied to the band wave wave generators 42 to 44, and the band wave wave generator 42 outputs a pilot signal fp, and the band wave wave generator 43 outputs a pilot signal fp. The pilot signal f is outputted, and furthermore, the pilot signal fp3 is outputted from the obijo monkey wave device 44.

The pilot signal fp is given to the polarity switching circuit 48 via the bell adjuster 45, and the pilot signal fp2
The polarity switching circuit 48 receives the pilot signal fp. is applied to the detection circuit 50 and the pilot signal fp2 is applied to the detection circuit 51, or the pilot signal fp is applied to the detection circuit 51 and the pilot signal fp2 is applied to the detection circuit 50.
I try to give them 1 bottle. A control terminal 49 of the polarity switching circuit 48 is supplied with a switching control signal from a sliding door control signal generation circuit 56.

That is, when the reproduction needle 33 is placed on a certain recording trace on the disc D in order to remove the main information signal from the recording trace on the disc D, the reproduction needle 33 will remove the main information signal from the recording trace on the disc D. In the state of accurate tracking, the reproducing needle 33 treats the two pilot signals fp, fp2 as having the same magnitude, and the reproducing needle 33 is biased toward one side in the middle of the recording trace. In this state, two pilot signals fp. , fp2, the size of one is larger than the other, but
At this time, in the tracking control circuit, the reproduction needle 33 is driven and displaced in the middle direction of the recording trace by the tracking control drive mechanism 35 so that the two pilot signals fp, fp2 are equally reproduced.

On the other hand, when the playback stylus 33 advances to the next record trace of the above-mentioned record trace and is in a state of reading the main information signal, a pilot signal is generated corresponding to the deviation of the record trace of the playback needle 33 in the middle direction. The state of change in the relative magnitude of the pilot signals fp, , fp2 is the state of change in the relative magnitude of the pilot signals fp, , fp2 that occurs when the reproducing needle 33 deviates in the middle direction on the recording trace described above. The relationship is exactly the opposite. Therefore, when the reproducing needle 33 advances to the next recording trace to collect information signals from successive recording traces on the disc D, the relative magnitudes of the pilot signals fp, fp2 generated for the successive recording traces are The polarity of the tracking control according to the changing state needs to be reversed for each successive recording trace by the polarity switching circuit 48. Therefore, when the disc is played back in the normal playback mode, In order to perform good tracking control for successive recording marks, the switching control signal generation circuit 56 supplies the required polarity switching control signals to the control terminals 49 of the polarity switching circuit 48. That's what I do.

The above-mentioned detection circuits 50, 51 (rectifier wave circuits 50, 51
) is given to a differential amplifier 52, and a tracking error signal is output from the differential amplifier 52. The tracking error signal from the difference amplifier 52 is sent to the phase compensation circuit 53.
After being compensated to match the operating characteristics of the tracking control drive mechanism 35, the signal is amplified by the drive amplifier 54 and supplied to the tracking control drive mechanism 35 as a tracking control drive signal. A kick pulse is supplied to the drive amplifier 54 from a control terminal 55, and when the kick pulse is supplied to the control terminal 55, the track sog control drive mechanism 35 moves the playback needle 33 from the recorded trace being tracked at that time. Move to another record.

It goes without saying that the direction of movement of the regeneration needle 33 due to the kick pulse applied to the control terminal 55 described above changes depending on the polarity of the kick pulse. In the example shown in FIG. 6, the drive amplifier 54 is also provided with a kick pulse generated by the control section 29 during the random access reproduction mode.

The control unit 29 includes a comparator 28 which indicates the result of comparing the reproduced address signal detected by the address signal detection unit 60' and the set address signal from the address signal setting unit 27 in the comparator 28. A kick pulse is output in accordance with the output signal from the comparator 28 which indicates the result of the comparison at . Note that the output of the control section 29 described above is also given to a speed control circuit (not shown).

In the playback device, the playback mode generates various pulses such as switching pulses and kick pulses required in so-called trick play playback modes such as still image playback mode, slow motion image playback mode, etc. These various pulses are used as a pilot signal fp3 extracted by a bandpass filter 44.
It is generated based on the time position of .

That is, the pilot signal fp3 extracted by the Oshiro-mono waver 44 is rectified and made into a monkey wave by the detection circuit 47, and is then given to the Kirisato control signal generation circuit 56.

Further, the control signal generation circuit 56 has its control terminal 5.
7 is configured to receive command pulses from an operation panel (control panel), and the cut-sliding control signal generation circuit 56 is required depending on the playback mode and operation mode set on the operation panel. Various control pulses are generated using the pilot signal fp3 as a time reference. When the disk D on which information signals have been recorded by the recording system as shown in the second figure is played back by the playback system configured as shown in the sixth figure, the TV signals of different programs recorded on the disk D are reproduced. , each having a length that is an integral multiple of a two frame (four field) period, and the signals of the first field of the TV signals of each of the different programs are recorded in alignment on a specific radius of the disk D. Since the pilot signal fp3 is recorded at a position subsequent to the recording position of the pilot signal fp3, which serves as a reference for the rotational phase of the
Even if the signal is a continuous TV signal for normal image playback or a TV signal for still image playback, when it is played back in still image playback mode, the TV signal of the program to be played back will always be displayed. A still image can be obtained using only the signal, and if the TV signal is recorded using the recording method of the present invention, the above-mentioned conventional problems will not occur.

It should be noted that a magnetic disk is used as the disk, and a magnetic head for recording TV signals on the magnetic disk D records and forms a recording trace of the TV signal, and a magnetic head for recording pilot signals fp, fp2. TV with records recorded by pilot signals fp, fp2
A TV signal in a magnetic recording and reproducing system in which recording is formed on a magnetic disk at the same time as a recording trace by a signal, and a TV signal and a pilot signal are simultaneously read out from a magnetic disk by a single magnetic head. The present invention may be applied to recording. In this case, the output signals of adder 11 and adder 26 in the recording system shown in the second figure may be applied to individual recording magnetic heads. .

In addition, for reproduction, a single reproduction magnetic head is attached to the tip of the cantilever 34 in the reproduction system shown in FIG.
The output signal of the magnetic head may be applied to the amplifier 36. Moreover, the recording method of the present invention can be used for TV recording on a master disc in an optical recording and reproducing method.
Of course, this may also be carried out when recording signals.

As is clear from the above detailed explanation, in the recording method of the TV signal on the rotating recording medium of the present invention, the TV signal to be recorded on the rotating recording medium is recorded and reproduced for each program. A signal of 2 frame periods (4 field periods) for each signal and information content to be targeted for still image reproduction is used as a unit recording signal,
It is assumed that the edited TV signal is edited in advance in chronological order so that it becomes a signal with a time length that is an integral multiple of the recorded signal in that unit, and when the edited TV signal is recorded on a rotating recording medium. the first two in the edited TV signal.
A specific part of the recording position of the vertical female erasure period located immediately before the video signal of the first field period of the frame is at the recording position of the reference signal of the rotational phase of the rotational recording medium, and the above-mentioned By switching between the first and second tracking control reference signals to be recorded on the rotating recording medium at the recording position of the reference signal of the rotational phase of the rotating recording medium, it is possible to In the still image playback mode, a playback signal is always obtained that provides a still image of a TV signal of one program, and according to the present invention, the above-mentioned problems are satisfactorily solved. In addition, even when the address signal is recorded during the direct blanking period of the TV signal and random access is performed to quickly extract necessary information from a large amount of information, the image content of the desired program is always displayed. It is possible to accurately obtain an information signal having .

[Brief explanation of the drawing]

FIGS. 1 and 4 are plan views of a disk showing recorded traces as models, and FIG. 2 is a T for a rotating recording medium of the present invention.
Block diagram illustrating an embodiment of a V signal recording method, No. 6
FIG. 3 is a block diagram showing an example configuration of a reproduction system, FIG. 3 is a frequency allocation diagram of signals, and FIGS. 5 a to 5 e are diagrams showing example waveforms of signals. 1... Laser light source, 2, 5, 6, 14... Reflecting mirror, 3,
4, 13... Light modulator, 7... Imaging lens, 8...
・Information signal source, 9...Address signal generation circuit, 10.
...FM modulator, 11, 26...Adder, 17-19
...Frequency divider, 20-22...Switching circuit, D is...
・Master disk, M...Motor, EC...Electronic editing device, D...Disc, 33...Reproduction needle, 34.
...Cantilever, 35...Tracking control drive device, 36...Pre-layer amplifier, 42-44...Obijo waver, 48...Polarity switching circuit, 56...Sliding control signal generation Circuit, 47, 50, 51...Detection circuit, 54...
- Drive amplifier, 60.. ．． Address signal detection section, 27.
... Address signal setting section, 28... Comparator, 29.
...Control unit. Figure 1: World Figure 2 Figure 3' Figure Younger Brother Mu Plan Figure 5 Younger Brother Figure 6

Claims (1)

[Scope of Claims] 1. A spiral or concentric record trace recorded on a rotating recording medium by a television signal to be recorded and reproduced corresponds to each revolution of the above-mentioned rotating recording medium. As a result, a television signal is recorded for each of four vertical scanning periods of the television signal to be recorded and reproduced, and a spiral is recorded and formed in the middle part of the recording traces of the television signal that are adjacent to each other. During recording traces by reference signals for circular or concentric tracking control,
Recording on the rotating recording medium in a state in which reference signals for first and second tracking control having different frequency values are sequentially and alternately switched corresponding to each rotation of the rotating recording medium. In a recording method for television signals on a rotating recording medium, the television signal to be recorded and reproduced is a signal for each program and information content to be reproduced as a still image. It is assumed that a signal of four vertical scanning periods is used as a unit recording signal, and is edited in advance in chronological order so that the signal has a time length that is an integral multiple of the recording signal of that unit, and the above-mentioned editing Specifying the recording position of the vertical blanking period located immediately before the video signal of the first vertical scanning period in the edited television signal when the edited television signal is recorded on a rotating recording medium. The first part to be recorded on the rotary recording medium is located at the recording position of the reference signal of the rotational phase of the rotary recording medium, and at the recording position of the reference signal of the rotational phase of the rotary recording medium. , the above-mentioned edited television signal, the reference signals for the first and second tracking controls, and the rotating recording medium, so that the reference signals for the second tracking control can be switched. A recording method for recording television signals on a rotating recording medium, in which a reference signal for the rotational phase of the rotational phase is recorded on the rotating recording medium. 2. A method for recording television signals on a rotating recording medium according to claim 1, wherein a reference signal for the rotational phase of the rotating recording medium is recorded in a recording trace of the television signal. 3. A recording system for television signals on a rotating recording medium according to claim 1, wherein each unit of recording signal is edited in advance into a signal format suitable for still image reproduction. 4. Recording of a television signal on a rotating recording medium according to claim 1, wherein an address signal for information retrieval is additionally recorded within a recording position of a predetermined vertical blanking period in a unit recording signal. method.