JPS6158072B2 - - Google Patents

Description

[Detailed Description of the Invention] A magnetic recording and reproducing method in which information signals are recorded and reproduced magnetically makes it extremely easy to record information signals on a magnetic recording medium and reproduce information signals from the magnetic recording medium. Therefore, it has been widely adopted as a means of recording and reproducing information signals in many technical fields, and magnetic recording media include tape-shaped, sheet-shaped, disk-shaped,
Various forms have been used, such as

By the way, in conventional general magnetic recording and reproducing devices, when the magnetic head forms a recording trace and when reproducing information signals from the recording trace, the magnetic head does not track the magnetic recording medium without tracking control. Information signals are recorded and reproduced from magnetic recording media, however, due to limitations imposed by the mechanical precision of each component in the magnetic recording and reproducing device, high-density recording and reproducing using magnetic recording media is difficult. cannot be done.

Therefore, in recent years, attempts have been made to develop magnetic recording and reproducing devices in which a magnetic head reproduces information signals while tracing recording traces on a magnetic recording medium under tracking control. Also, magnetic recording and reproducing devices have been proposed in which information signals are recorded on a magnetic recording medium by tracking control of a magnetic head.

However, in conventional magnetic recording and reproducing devices in which information signals are recorded and reproduced using tracking-controlled magnetic heads, it is necessary to use a dedicated magnetic head for recording tracking reference signals. It has a complex structure, and there are many difficulties in its implementation, and improvements have been desired.

The present invention provides a magnetic recording medium with tracking information in which a required tracking reference signal to be used for tracking control of a magnetic head is recorded on the surface of the magnetic recording medium prior to recording a TV signal on the magnetic recording medium. In recording the TV signal on the magnetic recording medium with tracking information, a magnetic head is used in a portion corresponding to a horizontal blanking period in each predetermined cycle with the horizontal scanning cycle of the TV signal as a unit. On the other hand, the magnetic head can record TV signals on the magnetic recording medium with tracking information during periods other than the above-mentioned reproduction period in the magnetic head. means for obtaining a tracking control signal based on a tracking reference signal obtained from a signal reproduced by the magnetic head; and means for controlling tracking of the magnetic head using the tracking control signal. Sideways
A magnetic recording medium on which a TV signal is recorded is obtained, and in reproducing the TV signal from the magnetic recording medium on which the TV signal is recorded, a magnetic recording medium is obtained from the signal reproduced by the magnetic head. This invention provides a magnetic recording and reproducing method for TV signals in which a magnetic head can reproduce TV signals from a magnetic recording medium under tracking control using a tracking control signal obtained based on a tracking reference signal. The above conventional problems can be satisfactorily solved, and a magnetic recording and reproducing device capable of high-density recording and reproducing that can be effectively used for various purposes can be easily realized.

Hereinafter, the magnetic recording and reproducing method of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 of the accompanying drawings shows the present invention when the magnetic recording and reproducing method of the present invention is implemented in a magnetic recording and reproducing apparatus using a disc-shaped magnetic recording medium (hereinafter referred to as a magnetic disk) as a magnetic recording medium. FIG. 1 is a block diagram showing one embodiment of a magnetic recording reproducibility method;
In the figure, VS is a signal source of a TV signal (regardless of whether it is a color TV or a black and white TV) to be recorded and reproduced. In the illustrated example, the signal source of the TV signal is shown as a TV camera, but the signal source VS can be any device that has the function of generating or supplying a TV signal. It may be.

In addition, in Figure 1, DA is the magnetic disk D
The mechanical unit DA in the illustrated example is a mechanical unit that transports a single magnetic head MH having driving, recording, and reproducing functions as required. It is shown as being composed of a MH transfer motor GM, a feed screw SS, a magnetic head retainer hr, etc. Magnetic disk drive motor M
is a predetermined rotational speed while the rotational phase of the magnetic disk D is regulated by the vertical synchronization signal in the composite video signal (TV signal) to be recorded and reproduced.
In other words, the time for one rotation of the magnetic disk D is the composite video signal (TV signal) to be recorded and reproduced.
The drive power is supplied from the motor drive amplifier of the disk servo system DS so that the magnetic disk D rotates at a rotation speed that is an integral multiple of one vertical scanning period and the rotational phase of the magnetic disk D is strictly maintained. Given. That is, 2 is a gear encoder attached to the rotation shaft 1 of the drive motor M, and this gear encoder 2 is used together with the detection coil 3 to generate detection pulses for the rotational phase of the magnetic disk D, and is used as a so-called intersync. In the disk servo system DS that operates in servo mode, the drive motor M is rotated at a predetermined rotation speed by comparing the phase of the detection pulse of the rotational phase of the magnetic disk D with the horizontal and vertical synchronization signals in the TV signal. For example, the jitter is controlled to be driven and rotated within 0.5 microseconds with an appropriate stable rotational phase.

In addition, a geared motor (DC motor) having a reduction ratio of, for example, about 200:1 is used as the transfer motor GM, and this transfer motor is moved with a constant rotational speed and rotational phase by a DC servo system DCS. It's being rotated. The DC servo system DCS receives a vertical synchronization signal SV from the control signal generation circuit CC and a rotation pulse generator PG provided in the transfer motor GM (for example, the transfer motor GM
A rotation pulse generated from a permanent magnet provided on a rotating shaft and a detection coil disposed opposite to the permanent magnet is given. , this DC servo system
It is desirable that the DCS be configured to perform phase loop control so as to improve the transfer accuracy of the magnetic head MH.

The transfer motor GM mentioned above is a DC servo system DCS.
The drive power sent from the motor drive circuit rotates the feed screw SS and retainer hr.
The magnetic head MH is continuously and linearly transported in the radial direction of the magnetic disk D via the magnetic head MH. retainer hr
has a screw hole that engages with the feed screw SS and a guide hole through which the guide bar 10 passes.

FIG. 2 is a perspective view showing an example of the structure of the magnetic head MH and the retainer hr. In FIG. 2, the magnetic head MH is connected to the tracking control drive mechanism 5 fixed to the retainer hr. The magnetic head MH is attached to one end of the cantilever 6, and the magnetic head MH is connected to the cantilever by a coupling portion provided between the tracking control drive mechanism 5 and the cantilever 6.
The magnetic gap portion is configured to be able to come into contact with the surface of the magnetic disk D with an appropriate pressing force.

The cantilever 6 is arranged so as to extend laterally to the direction in which the recording trace of the magnetic disk D extends (for example, in a direction perpendicular to the recording trace), and the cantilever 6 is arranged so as to extend in a direction perpendicular to the recording trace of the magnetic disk D. When the cantilever 6 is displaced in the direction of its extension, the magnetic head NH is displaced in the width direction of the recorded trace, and a tracking operation is performed.

For details on the structure in which the magnetic head MH is driven and displaced for tracking by the cantilever 6 extending laterally with respect to the direction of extension of the recording trace, see Japanese Patent Application No. 52-152254 and Japanese Patent Application No. 152-152.
Please refer to specifications such as No. 56-100707.

FIG. 3 is a perspective view showing a preferred configuration example of the magnetic head MH. In FIG. 3, 7 and 8 are plates made of a highly wear-resistant material such as sapphire plates, and 4 is a ferrite The core and 9 are the coils. A magnetic head MH has a structure in which a magnetic head body consisting of a ferrite core 4 around which a coil 9 is wound is held between sapphire plates 7 and 8 from both sides.
has excellent wear resistance and can be used for a long period of time with good properties.

In FIG. 1, SW ₁ and SW ₂ are recording/reproduction changeover switches, and these changeover switches SW ₁ ,
SW ₂ uses the recording/reproduction switching control signals sent from the control signal generation circuit CC, which generates various control signals, based on the command signals generated in response to the operation of the control panel CP, which selects the operation mode. By being applied to the terminals 11 and 12 of the object, the movable contact a is switched between the recording side fixed contact r and the reproduction side fixed contact P (electronic switches are used as these changeover switches SW ₁ and SW ₂ ). However, in FIG. 1, for convenience of illustration and explanation, it is shown like a mechanical switch).

Further, the control signal generation circuit CC described above is designed to generate various control signals necessary for the operation of various parts as will be described later, and to supply them to terminals 11 to 16 in FIG. 1 and the like.

In Figure 1, FMM is the signal source of the TV signal.
The SW is a frequency modulator for frequency modulating (FM) a carrier wave of an appropriate frequency value using the TV signal sent out from the VS, and the SW is a frequency modulator for frequency modulating (FM) a carrier wave of an appropriate frequency value using the TV signal sent out from the VS. A switching circuit that performs a switching operation to supply a recording signal to the magnetic head MB during recording as having timing and time length such that the recording signal can be recorded in a predetermined recording pattern on the magnetic disk D. The switching operation of the switching circuit SW is performed by a switching pulse supplied to the terminal 15 from the control signal generating circuit CC. Then, when the apparatus is in the recording mode, the recording signal in the form of an FM wave signal that has passed through the above-mentioned switching circuit SW is sent to the magnetic head via the adder circuit MIX, recording amplifier RA, changeover switch _SW2 , etc.
It is given to MH.

The adder circuit MIX is also configured to record and form recording traces based on different tracking reference signals on both sides of the recording trace to be formed by the recording signal in the form of the FM wave signal described above on the magnetic disk D. Two tracking reference signals fp ₁ and fp ₂ are provided from first and second tracking reference signal generators OSC ₁ and OSC ₂ .

That is, the first and second tracking reference signal generators OSC ₁ and OSC ₂ described above are controlled by control signals supplied to the respective terminals 13 and 14 from the control signal generation circuit CC, so that
A recording trace formed on the magnetic disk D by the first tracking reference signal fp ₁ and a recording trace formed on the magnetic disk D by the second tracking reference signal fp ₂ are respectively D
The first and second recording traces having timing and time length such that a predetermined recording pattern can be formed on both sides of the recording trace formed by the recording signal in the form of the FM wave signal described above. The tracking reference signals fp ₁ and fp ₂ are sent to the adder circuit MIX.

Each of the two different tracking reference signals mentioned above
fp ₁ and fp ₂ are two signals that have frequency values that are outside the occupied frequency band of the recorded signal in the form of the FM wave signal described above, that can be recorded and reproduced, and that contain mutually different information contents. For example, two signals having different frequency values, such as f ₁ and f ₂ , or two signals having the same frequency value but different phases are used.

FIG. 4 is a frequency allocation diagram of the occupied frequency band F of the recording signal in the form of an FM wave signal and the first and second tracking reference signals fp ₁ , fp ₂ whose frequency values are f ₁ , f ₂ . be.

In addition, the two tracking reference signals mentioned above
fp ₁ and fp ₂ are recorded only at positions corresponding to the horizontal blanking period of the TV signal in the recording trace of the recording signal in the form of the FM wave signal described above, so that respective recording traces are formed. The above-mentioned first and second tracking reference signal generators OSC ₁ and OSC ₂ are connected to respective terminals so that a recording trace can be formed by continuous waves of the tracking reference signal. It is controlled by control signals supplied to 13 and 14.

During the period when the device is set to recording mode by operating the control panel CP, the changeover switch SW ₁ is activated by the control signal from the control signal generation circuit CC.
The movable contact a is switched to the fixed contact r side,
The TV signal from the TV signal source VS is given to the sync separator SEP via the changeover switch _SW1 , and from the sync separator SEP, the vertical sync signal BV in the TV signal is sent to the sync separator SEP.
and horizontal synchronization signal Sh to the control signal generation circuit CC, which generates various control signals required when the apparatus operates in recording mode and sends them to each part of the apparatus. supply

In addition, when the device is in the recording mode, the changeover switch SW ₂ has its movable contact a switched to the fixed contact r, so that the magnetic head MH is given a signal from the recording amplifier RA, and the mechanical section
The motor M for driving the magnetic disk in DA is
The magnetic disk D is driven to rotate at a predetermined rotational speed and rotational phase by the driving power from the motor drive amplifier of the disk servo system DS,
Furthermore, the transfer motor GM is a DC servo system.
The magnetic head MH is rotated by the drive power sent from the DCS motor drive circuit, and the magnetic head MH is rotated accordingly.
are continuously and linearly transported in the radial direction of the magnetic disk D.

As is clear from the above description, in the magnetic recording and reproducing apparatus shown in the first diagram, the magnetic disk D is subjected to recording and reproducing by the driving motor M.
A single magnetic head MH, which is driven and rotated at a rotation period that is an integral multiple of one field period in a TV signal and is equipped with recording and reproducing functions, is magnetically driven by a head transport mechanism including a transport motor GM. Since the magnetic disk D is continuously transferred and displaced in the radial direction at a predetermined transfer speed in synchronization with the rotation period of the disk, when the apparatus is in the recording mode, the magnetic disk D is moved by the magnetic head MH. If a spiral recording trace is formed by the information signal on the top and the device is in playback mode,
It is clear that a spiral trajectory similar to the spiral recording trace formed on the magnetic disk D is formed as a result of the relative movement between the magnetic head MH and the magnetic disk D.

In the magnetic recording and reproducing system of the present invention, as a magnetic disk on which TV signals are to be recorded,
A magnetic disk (hereinafter also referred to as a magnetic disk with tracking information) D on which a recording trace based on a tracking reference signal is recorded in advance on the entire surface of the disk is used to magnetically record TV signals. During the horizontal blanking period of the TV signal, the magnetic head MH reproduces the tracking reference signal already recorded on the magnetic disk D with tracking information and supplies it to the tracking control system, and the magnetic head MH performs tracking control. Under,
Tracing the middle of two adjacent recording traces based on different tracking reference signals on the magnetic disk D with tracking information, a recording trace of the TV signal is recorded there, and on the other hand, during reproduction, it is recorded in advance on the magnetic disk D with tracking information. The previously recorded tracking reference signal and the horizontal synchronization signal in the form of an FM wave, which had been recorded in advance as necessary, are reproduced by a magnetic head at the same time as the TV signal, and the reproduced tracking reference signal is transmitted to the tracking control system. The magnetic head MH is tracked and controlled, and the reproduced TV signal is supplied with a signal obtained by delaying the horizontal synchronization signal obtained from a horizontal synchronization signal in the form of an FM wave that has been recorded in advance, or Since a signal equivalent to the horizontal synchronization signal obtained from the reproduced tracking reference signal is given as a horizontal synchronization signal to obtain a complete reproduction TV signal, when recording a TV signal according to the present invention, is a magnetic disk on which a required trace pattern is formed by a tracking reference signal,
That is, it is necessary to prepare a magnetic disk D with tracking information.

The magnetic disk D with tracking information described above may be mass-produced in a factory by, for example, a transfer method or other method, or the magnetic disk D with tracking information may be produced by a magnetic recording/reproducing apparatus shown in FIG. A trace of a desired pattern may be recorded on D by the tracking reference signal. In any case, the tracking reference signal that is recorded on the magnetic disk D with tracking information and that should be used for tracking control of the magnetic head MH when recording or reproducing TV signals is a tracking reference signal that is recorded on the magnetic disk D with tracking information and that is used for tracking control of the magnetic head MH when recording or reproducing TV signals. As long as the TV signal is recorded under tracking control, it will not be erased and will be used repeatedly when recording and reproducing the TV signal.

In order to obtain _the magnetic disk D with tracking information by the recording/reproducing apparatus shown in _FIG . In addition, only horizontal and vertical synchronization signals are sent from the control signal generation circuit CC to terminals 16 and 14 of the first and second tracking reference signal generators OSC ₁ and OSC ₂ . This can be achieved by providing a control signal of

By changing the form of the control signals to be applied to the terminals 13 and 14, the pattern of recording traces based on the tracking reference signal on the magnetic disk D with tracking information can be recorded and formed using continuous signals of the tracking reference signal. (In this case, it is better to keep the signal level of the tracking reference signal to be recorded low.) Or, if the recording trace pattern by the tracking reference signal is recorded on the magnetic disk D with tracking information. A trace pattern can be recorded in which bursts of the tracking reference signal are recorded only in portions of the signal corresponding to the horizontal blanking periods. In the following explanation, the tracking reference signal is
Tracking information in which recording traces are recorded in bursts only in portions corresponding to the horizontal blanking period of the TV signal to be recorded, and are previously recorded on the magnetic disk as recording traces by tracking reference signals. A magnetic disk has been created and is supposed to be used for recording and reproducing TV signals.

The pattern of recording traces based on the two tracking reference signals fp ₁ and fp ₂ recorded on the magnetic disk D with tracking information using the recording and reproducing apparatus shown in FIG. The mutual relationship with TW)
Is TP>TW or TP<TW
Depending on whether the recording trace is continuous or so-called skip recording, and further depending on the combination of the above conditions, various types of results can be obtained. (It goes without saying that even in the case of mass production in factories, a wide variety of record trace patterns can be produced).

5 to 10 are diagrams showing typical examples of recording trace patterns formed by tracking reference signals recorded on the magnetic disk D with tracking information using the two tracking reference signals fp ₁ and fp ₂ . In the figure, arrow α indicates the rotational direction of the magnetic disk D, and β indicates the switching position of the tracking reference signal within the vertical blanking period. Fifth
7 to 9 illustrate the case of TP>TW (TP=3TW in FIG. 7, TP=2TW in FIG. 8), and also in FIGS. 6 and 10. In the diagram
The case where TP<TW is illustrated.

On the tracking information-attached magnetic disk D having recording traces based on such tracking reference signals,
TV recorded by a magnetic head whose tracking is controlled using the tracking reference signal described above.
The recording trace by the signal includes all (in the case of Figures 8 and 9) or part (in the case of Figures 5, 6, 7, and 10) of the recording trace by each different tracking reference signal on both sides of the recording trace of the TV signal. In this case, a recording is formed in the middle of adjacent recording traces caused by two different tracking reference signals in such a manner that a trace shown in the figure is left behind.

Therefore, if we look at each adjacent recording trace after the recording trace by the TV signal is recorded on the magnetic disk D with tracking information, the seventh to
In the ninth case, TP=TW, and
In the cases shown in the fifth, sixth, and tenth figures, TP<TW.

In addition, in the intermediate portion between adjacent recording traces in the recording trace pattern based on the tracking reference signal shown in Figs. It is a desirable practice to record the FM wave signal based on the horizontal synchronization signal in advance, and in that case, record all the horizontal synchronization signals, or The manner of recording may be arbitrarily determined, such as recording the horizontal synchronization signal. Note that the recorded trace patterns based on the tracking reference signal are not limited to those shown in Figures 5 to 10 above, and may include, for example, those shown in Figure 5 (or Figure 6 or Figure 10) and those shown in Figure 9. Various products can be made by combining them.

In the TV signal recording and reproducing method of the present invention, even when recording a TV signal, the magnetic head MH can reproduce the tracking reference signal from the recording trace during all or part of the horizontal blanking period of the TV signal. Therefore, the horizontal synchronizing signal that should be recorded in the portion corresponding to the horizontal blanking period in the playback state is not recorded when the recording trace is formed by the TV signal.
When recording a signal, if switches SW ₁ and SW ₂ are controlled so that the tracking reference signal can be reproduced in correspondence with the entire horizontal blanking period of the TV signal, the signal is reproduced by the magnetic head MH. Ru
The TV signal will be one without any horizontal synchronization signal in it.

Since the TV signal is a periodic signal created according to the scanning standard established by the TV system,
Even if there is no horizontal synchronization signal in the reproduced TV signal, a complete TV signal can be obtained by adding a horizontal synchronization signal obtained by some method to the signal, so all horizontal synchronization signals in the reproduced signal Even if the synchronization signal is lost, there will be no problem with the reproduction of the TV signal.

As described above, since the TV signal is a synchronous signal, even if the horizontal synchronous signal is lost, it can be easily restored, which is one of the major constituent principles of the present invention. It has become an element.

By the way, since the sampling period of the tracking reference signal required for tracking control is 1/2 to 1/3 of the horizontal scanning period, it is sufficient to transfer the TV signal to the magnetic disk D with tracking information. 1 in the TV signal during recording.
The horizontal synchronizing signal in the TV signal may be recorded by the magnetic head MH during every third or every second horizontal blanking period,
In this case, of course, the tracking reference signal reproduced from the magnetic head MH is given to the tracking control system only during the horizontal blanking period in which the horizontal synchronizing signal in the TV signal is not recorded. It is used for this purpose. In any case, the tracking reference signal reproduced from the magnetic head is rectified and filtered in the tracking control system, sampled and held, and used for tracking control.

In this way, before the TV signal is recorded, the FM signal is recorded in advance using the horizontal synchronization signal at the position where the TV signal is to be recorded later (the position where the recording trace is to be formed by the TV signal). The above-mentioned method of keeping the TV, or the TV
By recording part of the horizontal sync signal when recording the signal, all the horizontal sync signals can be included in the reproduced signal and used, or some of the horizontal sync signals can be used. It is an advantageous means to create and use the remaining horizontal synchronization signal that has not been reproduced using the .

Then, a part of the horizontal sync signal is recorded during recording, and the above-mentioned part of the horizontal sync signal extracted from the reproduced signal is delayed using, for example, a delay circuit, and is used as the missing horizontal sync signal. By employing this method, it is possible to easily generate all the horizontal synchronization signals, thereby obtaining a TV signal having all the horizontal synchronization signals.

In the above explanation, a part of the horizontal synchronization signal is recorded, and an unrecorded horizontal synchronization signal is generated based on the recorded horizontal synchronization signal and inserted into the playback signal. We have previously described a method for obtaining a reproduced TV signal having all horizontal synchronization signals, but the tracking reference signal recorded on the magnetic disk with tracking information is recorded only at the position corresponding to the horizontal blanking period of the TV signal. If the tracking reference signal is extracted from the reproduced signal using a bandpass filter, it can be rectified and filtered, and then waveform-shaped by a waveform shaping circuit and used instead of the horizontal synchronization signal. By employing such a means, even if no horizontal synchronizing signals are recorded at the time of recording, it is possible to obtain a reproduced signal containing all horizontal synchronizing signals. Note that since there is noise in the reproduced TV signal in the portion corresponding to the horizontal blanking period during which the tracking reference signal was reproduced during recording, the horizontal blanking period in which the tracking reference signal was reproduced is not correct. When adding a new horizontal synchronizing signal to the line blanking period, prior to adding a new horizontal synchronizing signal, there is a well-known method of shaping the waveform of the horizontal blanking period to remove noise existing in that portion. Needless to say, this should be done.

When obtaining a magnetic disk D with tracking information having a recording trace pattern based on the tracking reference signal as shown in FIGS. An example of how to record is as follows.

First, a magnetic disk D with tracking information having a recording trace pattern based on a tracking reference signal as shown in FIG. 5, FIG. 7, and _FIG. a is switched to the fixed contact r side, and each is set at a predetermined recording trace interval.
The magnetic head MH is moved in the radial direction of the magnetic disk D so as to obtain TP, and furthermore, each rotation of the magnetic disk D, the recording trace caused by the tracking reference signal fp ₁ and the recording trace caused by the tracking reference signal fp ₂ are magnetically transferred. Terminals 1 of the first and second tracking reference signal generators OSC ₁ and OSC ₂ are sent from the control signal generation circuit CC so as to be recorded alternately on the disk D.
3 and 14 by providing necessary control signals. In this case, should each tracking reference signal fp ₁ and rp ₂ be recorded in a continuous wave state, or should it be recorded in a burst form only in the portion that reacts with the horizontal blanking period of the TV signal? The terminal 1 mentioned above
It goes without saying that this can be done arbitrarily by changing the control signals to be supplied to 3 and 14.

In a magnetic disk with tracking information having a recording trace pattern based on a tracking reference signal as shown in FIGS. 5, 7, and 10, an FM wave signal based on a horizontal synchronization signal is also recorded in advance. , the recording traces caused by the first tracking reference signal _rp1 on the magnetic disk D on which the recording trace patterns by the tracking reference signals as shown in FIGS. 5, 7, and 10 are recorded and formed as described above. , the magnetic head may be traced between the recording trace by the second tracking reference signal _fp2 to record the FM signal wave by the horizontal synchronization signal.
In order to prevent the tracking reference signal generators OSC ₁ and OSC ₂ from sending out signals, the control signal generation circuit CC supplies the necessary control signals to the control terminals 13 and 14 of the switching circuit SW. For terminal 15, a control signal generation circuit
By giving a control signal with the required timing and pulse width from the CC, the horizontal synchronization signal is sent from the FM modulator FMM through the tracking circuit SW.
Make sure you can get an FM wave signal. By changing the control signal supplied to the terminal 15 of the tracking circuit SW described above, it is possible to make the FM wave signal by the horizontal synchronization signal exist at all the horizontal synchronization signal positions, or to make it possible to make the FM wave signal by the horizontal synchronization signal exist at every predetermined number of positions. Only the horizontal sync signal position is determined by the horizontal sync signal.
Of course, it is possible to make it so that an FM wave signal is present.

In addition, when recording a record trace using the tracking reference signal described above, the recording of the tracking reference signal and the recording of the FM wave signal using the horizontal synchronization signal are performed in a time-sharing manner, and the recording trace according to the tracking reference signal is recorded by the tracking reference signal. The burst and the FM wave signal due to the horizontal synchronization signal may be recorded in a desired arrangement (every other horizontal synchronization signal is
Alternatively, the tracking reference signal may be recorded every second so that the missing tracking reference signal does not adversely affect the tracking control performance).

Next, a magnetic disk D with tracking information having a recording trace pattern based on a tracking reference signal as shown in FIGS. 6 and 8, respectively.
In this example, the device is set to the recording mode, the movable contact a of the changeover switch SW ₂ is switched to the fixed contact r side, and the magnetic head MH is set to the diameter of the magnetic disk D so that the predetermined recording trace interval TP is obtained. Furthermore, the first rotation of the magnetic disk D has a recorded trace due to the tracking reference signal _rp1 , and the next rotation has a recorded trace of a non-recorded state.
Furthermore, for the next rotation, the tracking reference signal fp ₂
The control signal generation circuit is configured so that recording traces are sequentially and repeatedly recorded on the magnetic disk D.
This can be obtained by applying necessary control signals from CC to the terminals 13 and 14 of the first and second tracking reference signal generators OSC ₁ and OSC ₂ .

Further _, in a magnetic disk D with tracking information having a recording trace pattern based on a tracking reference signal as shown in FIG.
In addition, the magnetic head MH is moved in the radial direction of the magnetic disk D so as to obtain a predetermined recording trace interval TP, and a tracking reference signal is sent during the first rotation of the magnetic disk D. There is a record trace due to fp ₁ , a record trace with no recording in the next revolution, a record trace with the second tracking reference signal fp ₂ in the next revolution, and a record trace with the second tracking reference signal fp 2 in the next revolution. 1 tracking reference signal
The control signal generation circuit is configured so that a recording trace caused by fp ₁ and an unrecorded recording trace in the next revolution are repeatedly recorded on the magnetic disk D.
This can be obtained by applying necessary control signals from CC to the terminals 13 and 14 of the first and second tracking reference signal generators OSC ₁ and OSC ₂ .

Each of the tracking control signals f _p1 ,
When recording f _p2 , it is difficult to determine whether the tracking reference signal should be recorded in a continuous wave state or in burst form only in the portion corresponding to the horizontal blanking period of the TV signal. It goes without saying that this can be done arbitrarily by changing the control signals to be supplied to the terminals 13 and 14 mentioned above.

In a magnetic disk D with tracking information on which recording traces are recorded based on tracking reference signals as shown in FIGS. 6, 8, and 9, an FM wave signal based on a horizontal synchronization signal is also recorded in advance. In order to achieve this, when a recording trace is formed using the tracking reference signal described above, an FM wave signal generated by the horizontal synchronization signal is sent to the adder circuit MIX via the switching circuit SW when a recording trace is recorded in a non-recorded state. All you have to do is make sure it is sent.

Next, the magnetic head is subjected to tracking control with respect to the magnetic disk D with tracking information on which the above-mentioned tracking reference signal or an FM wave signal based on the tracking reference signal and the horizontal synchronization signal is recorded in advance. in the state
An example of the configuration of a tracking control system used when recording a TV signal or reproducing a TV signal from a magnetic disk on which the TV signal is recorded by a magnetic head under tracking control will be explained with reference to FIG. Then, the result is as follows.

In FIG. 1, the frequency multiplexed signal of the FM signal from the TV signal reproduced by the magnetic head MH and the tracking reference signals f _p1 and f _p2 is transmitted through the movable contact a and the fixed contact p of the changeover switch SW ₂ . The process amplifier PRA is supplied to the preamplifier PA, is amplified there, and then includes an FM demodulator and a signal processing circuit (circuits that perform processing such as reinsertion of the horizontal synchronization signal and other operations).
along with the tracking servo circuit
TS (tracking control system TS) and the demodulated signal from the process amplifier PRA is output terminal 1.
7 and the fixed contact P in the changeover switch _SW1 .

The movable contact a of the changeover switch SW ₂ is switched to the fixed contact P side when the device is in the playback mode.
The movable contact a of the changeover switch SW ₂ is connected to the fixed contact P when reproducing the TV signal from the magnetic disk D and during the reading period of the tracking reference signal when recording the TV signal to the magnetic disk D with tracking information.
It is in a state where it is switched to the side.

The tracking servo circuit TS extracts the first and second tracking reference signals f _p1 and f _p2 from the frequency multiplexed signal applied thereto, and determines the magnitude of these two tracking reference signals f _p1 and f _p2 . A tracking control signal is generated by comparing the signals, and according to the polarity and magnitude of the tracking control signal, the magnetic head MH is displaced in a predetermined direction and magnitude in the radial direction of the magnetic disk D. The tracking servo circuit TS shown in FIG.
1, AGC circuit 19, detectors _Det1 , _Det2 , level adjusters 22, 23, differential amplifier 24, amplifier 25
It is shown as consisting of, etc.
A tracking control signal sent from the output terminal 26 is applied to the tracking control drive mechanism 5 shown in FIG. 2 to perform desired tracking control.

The reproduced signal given to the above-mentioned tracking servo circuit TS has a frequency arrangement as shown in Fig. 4, for example, and in Fig. 4, F is the occupied frequency of the FM wave signal of the composite video signal. Bands f _p1 and f _p2 are first and second tracking reference signals whose frequency values are f ₁ and f _2, respectively.

From the reproduced signal supplied to the tracking servo circuit TS, first and second tracking reference signals f _p1 , which exist at frequencies f ₁ , f ₂ in FIG. 4 are generated.
The first and second tracking reference signals _{f p1 ,}
f _p2 is simultaneously extracted and fed to the AGC circuit 19.

Use of the AGC circuit 19 is effective in improving the stability of the tracking servo circuit TS.

The output from the AGC circuit 19 described above is passed through a bandpass filter 20 for extracting the first tracking reference signal f _p1 and a second tracking reference signal f _p2 .
and a bandpass filter 21 for extracting the
First and second tracking reference signals f _p1 and f _p2 are extracted from the bandpass filters 20 and 21, respectively, and applied to individual detectors D _et1 and D _et2 , respectively.

The outputs from the detectors D _et1 and D _et2 are compared by a differential amplifier 24 (comparator 24) to determine the amplitude difference between the first and second tracking reference signals and the polarity of either positive or negative. An error signal having the following value is applied from the differential amplifier 24 to the amplifier 25 as a tracking control signal.

The amplifier 25 amplifies the above-mentioned tracking control signal applied thereto and sends it to the output terminal.The amplifier 25 also has a terminal 16 for changing the position of the magnetic head from one recording trace to another. A control signal for displacing the recording trace of the unit is supplied, and the output signal from the amplifier 25 is connected to the above-mentioned tracking control signal and the terminal 16.
The signal is a composite signal with the control signal supplied to the amplifier 25 via the control signal.

The tracking servo circuit TS shown in FIG _.
An example of a circuit is shown in which f _p2 have different frequency values.

By the operation of the tracking servo circuit TS described above, the magnetic head MH moves over a recording trace such that the tracking reference signals f _p1 and f _p2 read out by the tracking servo circuit TS are reproduced with equal magnitude.
This is done so that they can be tracked correctly.

When playing the composite video signal from the magnetic disk D, there are various playback modes, namely normal and
A playback mode that allows TV playback images to be displayed on the display (normal playback mode), still image playback mode, a playback mode that allows slow-motion images to be displayed on the display (slow-motion playback mode), and others. However, as mentioned above, the playback mode selection can be changed using the control panel.
This is done by operating the CP, and the control signal generation circuit
The CC generates various control signals that enable the device to perform playback operations depending on the playback mode selected by operating the control panel CP, and the various control signals control the changeover switch.
By controlling SW ₁ and SW ₂ and the tracking position of the magnetic head MH, the device performs the reproduction operation in the desired reproduction mode.

For example, when the device is operated in the normal playback mode, the magnetic head MH reproduces the recorded signal in one recording trace on the magnetic disk D a predetermined number of times (each recording trace in each unit on the magnetic disk D). If a composite video signal corresponding to frame recording with N:1 thinning is recorded in
A magnetic head displacement drive pulse is sent from the control signal generation circuit CC to the terminal 16 of the amplifier 25 of the tracking servo circuit TS so that the magnetic head MH is displaced to the position of the next recording trace when the data has been reproduced for the number of times). For example, when the device is operated in slow motion playback mode, the recorded signal in the recording trace of the magnetic disk D is successively repeated N×m times (N is N in the above example). N is a positive integer, m is a positive integer, and the slow motion ratio is determined by the value of m).
For example, when the apparatus is operated in a still image reproduction mode, the reproduction time and the reproduction time of the still image are recorded on the recording trace of the unit of the magnetic disk D so that the magnetic head displacement drive pulse is applied to the terminal 16 of the magnetic disk D. From the control signal generation circuit CC to the terminal 16 of the amplifier 25 of the tracking servo circuit TS, so that the magnetic head MH can be present during the corresponding time.
It is controlled by a magnetic head displacement drive pulse supplied to the magnetic head.

Next, a TV signal is recorded on the tracking information-attached magnetic disk D on which a recording trace based on the tracking reference signal as described above has been recorded in advance, by the magnetic recording/reproducing device shown in the first diagram, and
The case of reproducing a recorded TV signal will be explained.

When recording a TV signal by applying the method of the present invention, the magnetic disk D with tracking information to be used for recording is one on which a desired pattern of recording traces based on a tracking reference signal is recorded. , the recording traces of TV signals are magnetic disks D with tracking information.
Two different tracking reference signals f
A record is formed in the middle part of the record trace formed by _p1 and f _p2 . In forming the recording trace by the TV signal mentioned above, the magnetic head is under tracking control.
Adjacent different tracking reference signals f _p1 , f
The middle part of the recording trace by _p2 is correctly traced, and on both sides of the recording trace formed by the TV signal, even after the recording trace by the TV signal is formed, there are recordings by different tracking reference signals. At least a portion of the trace is left behind so that the magnetic head can correctly track the recorded trace of the TV signal under tracking control even during the reproduction operation of the TV signal.

FIG. 11 shows that when the recording trace pattern based on the tracking reference signal recorded in advance on the magnetic disk D with tracking information is, for example, as shown in FIG. This is a diagram illustrating the state in which a recording trace due to a signal is recorded and formed, and as the magnetic disk D moves in the direction of the arrow in the figure with respect to the magnetic head MH, the magnetic head MH records the recording trace due to the TV signal. Records are being formed like the record trace tV inside.

When forming a record using the TV signal described above, the tracking reference signal generators OC ₁ and OC ₂ in the recording and reproducing apparatus shown in FIG.
The sending operation of the tracking reference signals f _p1 and f _p2 is stopped by the control signal supplied from the control signal generation circuit CC to 3 and 14, and the TV signal supplied from the signal source VS is stopped. The output signal from the FM modulator FMM, which makes the TV signal in the form of an FM wave, is continuously given to the adder circuit MIX on the time axis via the switching circuit SW, and the output signal from the adder circuit MIX is recorded. It is applied to the fixed contact r of the changeover switch _SW2 via the amplifier RA.

The movable contact a of the changeover switch SW ₂ is switched to the fixed contact P side during the horizontal blanking period of the TV signal by a control signal applied to the terminal 12 from the control signal generation circuit CC. During other periods, switching is controlled so that the fixed contact is switched to the r side.

Therefore, the magnetic head MH operates as a reproducing head during each horizontal blanking period of the TV signal to regenerate the tracking reference signal, which is then transmitted to the preamplifier.
Since the signal is sent to the tracking servo circuit TS via the PA, the magnetic head MH can correctly trace the middle part of the recording trace based on the two tracking reference signals under tracking control.
Since the FM wave signal of the TV signal is supplied to the MH during a period other than the horizontal blanking period of the TV signal, the magnetic head MH records the TV signal excluding the horizontal blanking period on the magnetic disk D. record trace
This causes tV to be recorded.

In the case shown in Figure 11, since there is no horizontal synchronization signal in the recorded TV signal, a horizontal synchronization signal is created from a tracking reference signal burst during playback, and then added to the reproduced TV signal. TV with horizontal synchronization signal by adding
It is necessary to use it as a signal.

FIG. 12 shows a magnetic disk D with tracking information, which has a recording pattern based on a tracking reference signal as shown in FIG. FIG. 2 is an explanatory diagram of a case in which a TV signal is recorded using a TV signal. In this case,
A record trace of the FM wave signal P _h due to the horizontal synchronization signal is recorded in advance at the planned position where the record trace by the TV signal should be formed, but when recording the TV signal, the horizontal blanking period in the TV signal is magnetic head
The tracking reference signal is regenerated by the MH (the tracking reference signal has a low frequency value, so it can be regenerated as crosstalk by the magnetic head MH), and tracking control is performed without any problems. By creating the missing horizontal synchronization signal based on the horizontal synchronization signal sometimes included in the reproduction signal, a reproduced TV signal having all the synchronization signals can be easily obtained. Note that in the example shown in Figure 12, the FM wave signal P _h due to the horizontal synchronization signal is recorded in advance only at every other horizontal synchronization signal position, but in other embodiments, the horizontal synchronization signal by FM
As mentioned above, a wave signal may be recorded.

Using a magnetic disk D with tracking information on which a recording trace by a tracking reference signal (and a recording trace of an FM wave signal by a horizontal synchronizing signal) as shown in FIGS. 6 to 10 is recorded, a TV signal is recorded on it. When creating a recording trace, the recording trace caused by the TV signal is transferred to the magnetic disk D with the tracking reference signal that has already been recorded being used and the magnetic head being properly tracked.
The tracking reference signal recorded on the magnetic head and reproduced during reproduction is used to control the tracking of the magnetic head.
Reproduction can be performed in a state in which the MH accurately tracks the recording trace of the TV signal. The addition of the horizontal synchronizing signal during reproduction is the same as described above.

When the patterns of recording traces based on tracking reference signals recorded in advance on the magnetic disk D with tracking information are as shown in FIGS. 6, 8, and 9, the recording traces due to TV signals are as follows In the case shown in Figure 8, the record trace t ₂ → t ₄
→t ₆ ..., and in the case shown in Figure 9, the record trace becomes discontinuous as t ₂ →t ₅ →t ₈ ... (when viewed as a record trace pattern, it becomes uneven) ), in order to continuously record and reproduce TV signals when using a magnetic disk D with tracking information such that the recording trace pattern based on the tracking reference signal is as shown in FIGS. 6, 8, and 9, When recording and reproducing TV signals, at switching position β of the tracking reference signal on the magnetic disk D, the magnetic head MH moves to the next recording trace (Figs. 6 and 8).
In the illustrated case, the record trace t ₂ is followed by the record trace t ₄ , the record trace t 4 is followed by the record trace t ₆ , etc., and in the case of the ninth illustration, the record trace t ₂ is followed by the record trace t _{4 For} example, it is necessary to move the control signal generation circuit to the terminal ₁₆ of the amplifier 25 in the tracking _control system. This can also be done by supplying a kick pulse from the CC.

The explanation so far has been made regarding the case where a magnetic disk is used as the magnetic recording medium, but it goes without saying that the method of the present invention can also be well applied to tape-shaped or sheet-shaped magnetic recording media. do not have.

As is clear from the above explanation, the TV of the present invention
The magnetic recording and reproducing method of the signal is such that the TV signal is a periodic signal created according to a specific scanning standard, so even if its horizontal synchronization signal is missing, Taking advantage of the fact that the horizontal synchronization signal can be easily reinserted or added, the magnetic recording medium used for recording and reproducing TV signals can be used to record traces of tracking reference signals (or By using a magnetic recording medium on which recording traces of both a tracking reference signal and a horizontal synchronizing signal are recorded, that is, a magnetic recording medium with tracking information, when recording a TV signal, the horizontal During the blanking period, the tracking reference signal is read from the magnetic disk by the playback head, thereby controlling the tracking of the magnetic head during recording operation, making it possible to achieve high-density recording of TV signals on the magnetic disk. In addition, by adding the horizontal synchronization signal that was not recorded during recording as a result of the above-mentioned recording operation by an appropriate means during playback, it is possible to obtain a complete signal during the entire recording and playback operation.
A magnetic recording and reproducing method for TV signals in which the recording and reproducing of TV signals is performed satisfactorily under tracking control.
A single magnetic head is used for both recording and reproducing signals. However, it refers to a magnetic head with a structure in which it is impossible to perform both operations at the same time.However, in carrying out the present invention, a plurality of single magnetic heads may be used.) is a magnetic recording medium. Since tracking is controlled using a tracking reference signal read from a magnetic recording medium, high-density recording and reproduction of TV signals can be easily achieved using a magnetic recording medium.

In carrying out the present invention, two single magnetic heads each having a different azimuth angle are used to record and reproduce information signals on a magnetic recording medium by the so-called tilted azimuth recording method. You can also do this. In the above case, the recording trace pattern based on the tracking reference signal that should be recorded in advance on the magnetic recording medium is TP=TW
Although it is preferable that the trace pattern is set as follows, other trace patterns may be used. In addition,
The tracking reference signal can be read without any problem whether or not the oblique azimuth recording method is applied in forming the recording trace using the tracking reference signal.

If a magnetic recording/reproducing device to which the method of the present invention is applied is used in combination with a TV camera, it can be used for the same purpose as a normal optical camera or optical camera. Also,
The method of the present invention also functions effectively when a magnetic recording/reproducing device is used for information filing purposes.

Note that when the TV signal to be recorded is a color TV signal, it is a matter of course that the burst signal should be included in the TV signal recorded on the magnetic recording medium.

As described above, according to the TV signal recording and reproducing method of the present invention, the magnetic head can be displaced under tracking control both during recording and reproducing by simple means, so that the magnetic recording medium can be This makes it possible to easily provide a magnetic recording/reproducing apparatus that can perform density recording and accurate tracking of recorded traces during reproduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a magnetic recording and reproducing apparatus to which the magnetic recording and reproducing method for TV signals of the present invention is applied, FIG. 2 is a perspective view of a magnetic head portion subjected to tracking control, and FIG. 3 is a magnetic FIG. 4 is a perspective view showing an example of the configuration of the head, FIG. 4 is a frequency distribution diagram of signals, and FIGS. 5 to 12 are plan views schematically showing recording trace patterns. VS...TV signal source, DA...mechanical unit, TS...tracking servo circuit, PRA...process amplifier, FMM...FM modulator, SW...switching circuit, SW ₁ , SW ₂ ...changeover switch, MIX...addition circuit, OSC ₁ , OSC ₂ ...First and second tracking reference signal generators, SEP...Sync separator, CC...Control signal generation circuit, DS...Disk servo system, DCS...DC
Servo system, CP...control panel, RA...recording amplifier, D...magnetic disk, M...drive motor,
MH...magnetic head, GM...transfer motor, SS...feed screw, hr...retainer, 5...tracking control drive mechanism, 6...cantilever, 7, 8...sapphire plate, 4...magnetic head body, 9...coil, t ₁ , _t2 ,
t ₃ , t ₄ ...record trace.

Claims (1)

[Scope of Claims] 1. A single magnetic head capable of being displaced and driven in the width direction of a recording trace for tracking control records a television signal on a magnetic recording medium under tracking control; A magnetic recording and reproducing method for television signals that enables reproduction of television signals from a magnetic recording medium, which records television signals to be recorded and reproduced in the magnetic recording medium on the magnetic recording medium. means for obtaining a magnetic recording medium with tracking information, in which a required tracking reference signal to be used for tracking control of a magnetic head is recorded on the surface of the magnetic recording medium, and said magnetic recording medium with tracking information; When recording a television signal on a medium, a magnetic head records information from a magnetic recording medium with tracking information in a portion corresponding to a horizontal blanking period in each predetermined period of the horizontal scanning period of the television signal. so that the signal can be regenerated,
On the other hand, means for enabling the magnetic head to record a television signal on a magnetic recording medium with tracking information during a period other than the above-mentioned reproduction period in the magnetic head; means for obtaining a tracking control signal based on a tracking reference signal obtained from the
A magnetic recording medium on which a television signal is recorded is obtained by a means for performing tracking control of a magnetic head using a tracking control signal, and a television signal is obtained from the magnetic recording medium on which the television signal is recorded. When reproducing the television signal, the magnetic head reads the television signal from the magnetic recording medium under tracking control using a tracking control signal obtained based on a tracking reference signal obtained from the signal reproduced by the magnetic head. A magnetic recording and reproducing method for television signals that can be reproduced. 2. By guiding the magnetic head to the intermediate portion of adjacent recording traces based on different tracking reference signals recorded in advance on a magnetic recording medium with tracking information, the recording traces formed by the television signal are , and is sandwiched on both sides by recording traces based on different tracking reference signals, so that the magnetic head can perform a reproducing operation under tracking control during reproduction. A magnetic recording and reproducing method for television signals. 3. If there is an overlap between adjacent recording traces based on different tracking reference signals pre-recorded on a magnetic recording medium with tracking information and recording traces formed between the recording traces by a television signal. 2. A magnetic recording and reproducing system for television signals according to claim 1, which is adapted to generate a television signal. 4. A part of the horizontal synchronization signal in the television signal that is to be recorded and reproduced is recorded in advance on a magnetic recording medium, and the reproduction signal of the recorded horizontal synchronization signal is used to reproduce the television signal. Claim 1 in which a horizontal synchronization signal that was not recorded at the time of recording is created and used.
Magnetic recording and reproducing method for television signals as described in . 5 The recording position of each horizontal synchronization signal in each recording trace is aligned with respect to each other recording trace, and each has a single low frequency value only in the portion corresponding to the horizontal blanking period. 2. A magnetic recording and reproducing system for television signals according to claim 1, wherein a tracking reference signal is recorded.