JPH05314596A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the variation of a phase difference voltage before and after the start of recording and to make the running of magnetic tape smooth by setting an operating center level of the phase difference signal after the start of a new video signal recording by an operating point setting circuit. CONSTITUTION:The phase difference signal outputted from a phase comparator 14 is inputted to a signal processing circuit 22. Then, numerical data (m) corresponding to the input signal level are supplied to the operating point setting circuit 23 through a switch, hold circuit, inversion amplifier and A/D converter which are incorporated in the circuit 22. At this time, the incorporated switch is closed during a changeover signal (a) from a system controller 11 is in the 'H' state and opened when the signal is changed over to the 'L' state. Consequently, the data (m) are set by the circuit 22 so that a reference synchronizing signal (e) is set to the phase such that the level of phase difference signal outputted from the comparator 14 coincides with the phase difference signal level at the time before the start of new video signal recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a VT having an editing function.
The present invention relates to a magnetic recording / reproducing apparatus such as an R (video tape recorder), and particularly to a servo system suitable for so-called continuous shooting, in which a second signal is newly recorded following a first signal already recorded on a magnetic tape. The present invention relates to a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art In a VTR, a video signal from a video camera or a television broadcast or a video signal of a desired program is recorded on a magnetic tape, and a new video signal is often recorded subsequently to these video signals at a later date. However, when such continuous shooting is performed, it is desirable that no synchronization disturbance occurs at the boundary between the new and old video signals during reproduction. For this purpose, the new video signal must be recorded on the magnetic tape in phase synchronization with the old video signal. An example of such a technique for continuous shooting is disclosed in Japanese Patent Laid-Open No. 59-191165, and this conventional technique will be described below.

FIG. 7 is a block diagram showing such a conventional technique. 1 is a magnetic tape, 2 is a capstan shaft, 3 is a capstan motor, 4 is a pinch roller, 5 is a control head, 6 is an input terminal, and 7 is an input terminal. Is a frequency divider, 8 is a switch,
9 is a recording amplifier, 10 is a switch, 11 is a system controller, 12 is a reference signal generator, 13 is a frequency divider, and 14
Is a phase comparator, 15 is a motor drive circuit, 16 is a frequency generator, 17 is a frequency divider, 18 is a reproduction amplifier, 19 is a switch, 20 is a preset pulse generator, and 21 is a pause switch.

FIG. 8 is a waveform diagram showing the output signals from the respective parts of FIG. 7, and the corresponding signals in FIG. 7 are designated by the same reference numerals.

In FIGS. 7 and 8, the magnetic tape 1 is a capstan shaft 2 which is rotated by a capstan motor 3.
And is pinched by the pinch roller 4 and running. Now, assuming that it is in the reproduction mode, the old video signal is reproduced from the magnetic tape 1 by a rotary head (a video head mounted on a rotary cylinder) not shown,
The control signal g of 30 Hz recorded at the same time when the old video signal was recorded by the control head 5
Is being played. At this time, the switch 8 is open, the switch 10 is closed, and the switch 19 is closed on the P side. Therefore, the reproduced control signal g is supplied to the phase comparator 14 via the reproduction amplifier 18 and the switch 19.

On the other hand, the reference signal generator 12 generates a high frequency reference signal d, and the reference signal d is divided by a frequency divider 13 composed of a counter so that the duty ratio is constant and 3
A reference synchronization signal e of 0 Hz is formed. This reference synchronizing signal e is phase-compared with the control signal g by the phase comparator 14, and a signal representing the phase difference between them, as shown by the one-dot chain line F in FIG. 7, is supplied to the motor drive circuit 15 to supply the capstan motor. 3 is phase controlled.

Here, in the phase comparator 14, the phase is synchronized with the falling edge of the reference synchronizing signal e by 30.
A trapezoidal wave f of Hz is formed. The trapezoidal wave f is sampled as a sampling pulse by the control signal g, but the amount of deviation of the sampling point from the center of the rising edge of the trapezoidal wave f is the phase difference between the reference synchronization signal e and the control signal g. Yes, the level of the signal obtained by this sampling represents the phase difference. The capstan motor 3 is phase-controlled so as to eliminate this phase difference, that is, to be phase-synchronized with the reference synchronization signal e.

In order to continuously shoot a new video signal on the magnetic tape 1, after setting the above reproduction mode once,
The pause switch 21 is closed to start recording. At the same time, the vertical synchronizing signal b of 60 Hz of the new video signal is supplied from the input terminal 6. The vertical synchronizing signal b is divided by 2 by a frequency divider 7 such as monomulti, and a 30 Hz frame synchronizing signal c synchronized with the vertical synchronizing signal b having every other rising edge is obtained. The frame synchronization signal c is supplied to the frequency divider 13 as a preset signal via the switch 10. The frequency divider 13 is preset at the falling edge of the frame synchronization signal c, and as a result, the reference synchronization signal e is formed from this reference synchronization signal e such that its rising edge leads the rising edge of the frame synchronization signal c. Trapezoidal wave f
The phase is forcibly adjusted by the frame synchronization signal c from the frequency divider 7 so that the center of the inclined rising edge of is coincident with the rising edge of the frame synchronization signal c.

At this time, since the phase relationship between the vertical synchronizing signal b of the new video signal and the control signal g reproduced from the control head 5 is random, when the frequency divider 13 is preset by the frame synchronizing signal c, Although the relationship between the reference synchronization signal e and the control signal g is random, a signal representing the phase difference between them is supplied from the phase comparator 14 to the motor drive circuit 15, and as a result, the control signal g is trapezoidal. The phase of the capstan motor 3 is controlled so that it coincides with the center of the rising edge of the wave f, and the capstan motor 3 is phase-synchronized with the reference synchronization signal e. Therefore, it also comes into phase synchronization with the frame synchronization signal c from the frequency divider 7.

When the capstan motor 3 is phase-synchronized with the frame synchronization signal c, the old video signal and the new video signal on the magnetic tape 1 are phase-synchronized, and the new video signal is magnetically followed by the old video signal. Even if you record on tape 1,
No synchronization disturbance occurs at these boundaries during reproduction.

After the pause switch 21 is closed, when the time sufficient for the capstan motor 3 to be phase-synchronized with the reference synchronizing signal e has elapsed, the system controller 11 inverts the switching signal a from "H" to "L". Then, the switch 8 is closed and the switch 10 is opened. As a result, the frame synchronization signal c output from the frequency divider 7 is supplied to the control head 5 as a new control signal via the switch 8 and the recording amplifier 9 and recorded on the control track (linear track) of the magnetic tape 1. .. At this time, recording of a new video signal by the rotary head is also started.

On the other hand, the frequency generator 16 outputs a frequency signal i having a frequency proportional to the rotation speed of the capstan motor 3.
The frequency signal i is divided by the frequency divider 17 to obtain a phase signal h of 30 Hz. This phase signal h is supplied to the preset pulse generator 20, and when the switching signal a changes from "H" to "L", the preset signal j is formed from the trailing edge of the phase signal h immediately after that. The frequency divider 13 is preset by the preset signal j, and the falling edge of the instantaneous reference synchronization signal e is forcibly synchronized with the falling edge of the phase signal h from the frequency divider 17. Immediately after that, the preset pulse generator 20 generates a switching signal and switches the switch 19 from the P side to the R side. As a result, the phase signal h is supplied to the phase comparator 14 via the switch 19.

Here, when the frequency divider 13 is preset by the preset signal j and the falling edge of the reference synchronizing signal e is forcibly phase-locked with the falling edge of the phase signal h, the rising edge of the phase signal h. Edge is reference sync signal e
The duty ratio of the phase signal h is set by the action of the frequency divider 17 so that it is located at the center of the inclined rising edge of the trapezoidal wave f formed by.

As described above, the phase of the phase signal h is random with respect to the control signal g, but the switch 19
Immediately before switching from the P side to the R side of, the phase of the reference synchronizing signal e is forcibly matched with the phase of the phase signal h. Therefore, the reference synchronizing signal e and the phase signal h immediately after switching the switch 19 are changed.
Is equal to the phase relationship between the reference synchronization signal e and the controller signal g immediately before the switch 19 is switched, and the phase difference signal (phase difference signal level) from the phase comparator 14 is indicated by the one-dot chain line F. As shown, even if the switch 19 is switched, there is no change, and the synchronous relationship between the capstan motor 3 and the new video signal is maintained.

The frequency divider 13 performs the same preset once or twice at most, and thereafter the phase of the reference synchronizing signal e is fixed. Then, the reference synchronization signal e and the phase signal h
The phase of the capstan motor 3 is controlled in accordance with the phase difference between and, and the phase is synchronized with the reference synchronization signal e. Also,
This phase control is also to synchronize the capstan motor 3 with the new video signal, which enables continuous shooting of the new and old video signals without disturbance in synchronization.

[0016]

By the way, in the above-mentioned prior art, it is premised that there is no variation or offset in the electric circuit for phase control of the capstan motor 3, the characteristics of the capstan motor 3, and the load of the tape running system. If the time sufficient for the capstan motor 3 to be phase-synchronized with the reference synchronization signal e has elapsed, the control signal g
Coincides with the center of the inclined rising edge of the trapezoidal wave f, and the level of the phase difference signal becomes the center of the output range. I expect to be seen.

However, since there are variations and offsets in the actual circuits, even if a sufficient time has passed for the capstan motor 3 to be phase-synchronized with the reference synchronizing signal e, the control signal g is not always the trapezoidal wave f. It does not always coincide with the center of the sloped rising edge of. Therefore, as shown in FIG. 9, the control signal g is phase-controlled at a position delayed from the center of the rising of the trapezoidal wave f, and the level of the phase difference signal becomes higher than the center of the output range.
Although not shown in particular, the phase is controlled to the advanced position and the level of the phase difference signal becomes lower than the center of the output range.

However, after the switching signal a is switched from "H" to "L", the frequency divider 13 outputs the preset signal j.
Preset, the falling edge of the reference synchronization signal e is forcibly phase-synchronized with the falling edge of the phase signal h, and the rising edge of the phase signal h is changed to the reference synchronization signal e.
Since the duty ratio of the phase signal h is set by the action of the frequency divider 17 so that it is located at the center of the inclined rising edge of the trapezoidal wave f formed by, the phase difference signal from the phase comparator 14 is As indicated by the chain double-dashed line F in FIG. 9, it will fluctuate. As a result, the running of the magnetic tape fluctuates at the start of recording the new video signal, the recording track is disturbed, and smooth continuous shooting cannot be performed.

The object of the present invention is to solve the above problems.
It is an object to provide a magnetic recording / reproducing apparatus that enables smooth continuous shooting.

[0020]

In order to achieve the above object, according to the present invention, a new image is obtained from the result of processing the control output signal in the capstan motor phase control during the period in which the old image signal recording portion is running. It is configured to set the operation center level of the phase difference signal after the start of signal recording.

[0021]

The signal processing circuit takes in the phase difference signal from the phase comparator, and the operating point setting circuit sets the operation center level of the phase difference signal after the start of recording the new video signal from the processing result. By doing so, the fluctuation of the phase difference signal before and after the start of the recording of the new video signal is eliminated, the running of the magnetic tape at the start of recording the new video signal becomes smooth, and smooth continuous shooting can be performed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a block diagram showing a main configuration of a magnetic recording / reproducing apparatus (VHS type home VTR) according to the present embodiment, in which 22 is a signal processing circuit and 23 is an operating point setting circuit. The same reference numerals are given to the portions corresponding to, and the overlapping description will be omitted. Further, FIG. 2 is a waveform diagram showing output signals from the respective parts of FIG. 1, and corresponding signals in FIG. 1 are denoted by the same reference numerals.

The phase difference signal is input to the signal processing circuit 22 of FIG. 1 as a control output signal. Further, in FIG. 1, the frequency divider 17 divides the frequency signal i output from the frequency generator 6 and outputs a phase signal h of 30 Hz. This phase signal h is supplied to the R side of the switch 19 and also serves as a reset signal in the operating point setting circuit 23.
Has been entered in. The operating point setting circuit 23 is also supplied with the reference signal d from the reference signal generator 12, and is further supplied with the processing result (numerical data) m of the signal processing circuit 22.

The signal processing circuit 22 takes in the phase difference signal output from the phase comparator 14, processes the phase difference signal as a control output signal, and sends it as numerical data m to the operating point setting circuit 23. The signal processing circuit 22 processes the phase difference signal as a control output signal during the period when the switching signal a from the system controller 11 is "H", and after the switching signal a is switched to "L". Holds the result of processing within the "H" period and sends it to the operating point setting circuit 23.

The operating point setting circuit 23 counts the reference signal d while being reset at each rising edge of the phase signal h, and the count value m of the control output signal processing result sent from the signal processing circuit 22. Compare with. As a result, as shown in FIG. 2, the operating point setting circuit 23 sends the rising edge of the phase signal h and the "H" period from the period of the reference signal d and the signal processing circuit 22. A pulse signal k that is determined by the incoming numerical data m is output. Therefore, the "H" period of the pulse signal k, that is, the period from the rising edge to the falling edge is not a fixed value, and the time corresponding to the phase error in the period when the switching signal a from the system controller 11 is "H". Is set to.

When the switching signal a from the system controller 11 is inverted from "H" to "L", the preset pulse generator 20 detects the trailing edge of the pulse signal k immediately thereafter and outputs the preset signal j. Immediately thereafter, the switch 19 is switched from the P side to the R side. As a result, when the frequency divider 13 is preset by the preset signal j, the phase signal h is immediately supplied from the frequency divider 17 to the phase comparator 14 via the switch 19.

When the frequency divider 13 is preset by the preset signal j, as shown in FIG. 2, the reference synchronizing signal e of 30 Hz is forcibly fallen at this preset time point and thereafter fixed to that phase. The timing of the preset signal j coincides with the falling edge of the pulse signal k, and the timing is set according to the phase error during the period when the switching signal a from the system controller 11 is "H". Immediately after the frequency divider 13 is preset, the rising edges of the reference synchronization signal e and the phase signal h are
The reference synchronization signal d regardless of the cycle of the frequency synchronization signal i
And the numerical data m output from the signal processing circuit 22
There is a timing relationship determined by.

Therefore, immediately after presetting by the preset signal j of the frequency divider 13, the timing of the falling edge of the phase signal h with respect to the inclined rising of the trapezoidal wave f formed from the reference synchronizing signal e in the phase comparator 14 is as follows. The signal processing circuit 22 processes the control output signal during the period when the switching signal a from the system controller 11 is "H" so that the switching signal a from the system controller 11 becomes the same as that during the period "H". , Numerical data m is sent to the operating point setting circuit 23. With this configuration, the control signal g is trapezoidal wave f due to variations in circuit and offset.
Even if the level of the phase difference signal is higher than the center of the output range due to the phase control at a position delayed from the center of the rising edge of, the output from the phase comparator 14 after the switch 19 is switched. The phase difference signal does not change as indicated by the one-dot chain line F.

FIG. 3 shows one of the signal processing circuits 22 in FIG.
2 is a circuit diagram showing a specific example, in which 24 is a switch, 25 is a hold circuit, 26 is an inverting amplifier, and 27 is an analog-digital converter, and the portions corresponding to FIG.

The phase difference signal output from the phase comparator 14 is input to the hold circuit 25 via the switch 24. The hold output l of the hold circuit 25 is inverted by the inverting amplifier 26 around the voltage of the power supply E and input to the analog-digital converter 27. Here, the voltage of the power source E is set to the center level of the output range of the phase difference signal. The analog-digital converter 27 digitally converts the input signal and supplies the operating point setting circuit 23 with numerical data m corresponding to the input signal level. The switch 24 is closed while the switching signal a from the system controller 11 is "H", and is opened when switching to "L". Therefore, the switching signal a changes from "H" to "L". The hold circuit 25 after switching holds the phase difference signal immediately before the switching signal a is switched from “H” to “L” and supplies it to the analog-digital converter 27. Therefore, the numerical data m supplied to the operating point setting circuit 23 is the numerical data determined from the phase difference signal level immediately before the switching signal a is switched from "H" to "L", that is, from the running of the old video signal recording portion. The control output signal immediately before switching to the recording of the new video signal will be supplied.

FIG. 4 is a circuit diagram showing another specific example of the signal processing circuit 22 in FIG. 1, in which 27 is an analog-digital converter, 28 is an arithmetic processing unit, and the portions corresponding to FIG. 1 are the same. It is attached with a code.

The phase difference signal output from the phase comparator 14 is input to the analog-digital converter 27, converted into numerical data n corresponding to the input signal level, and supplied to the arithmetic processing unit 28. The arithmetic processing unit 28 supplies the result of processing the numerical data n to the operating point setting circuit 23 as numerical data m. Since the arithmetic processing unit 28 also takes in the switching signal a at the same time, the phase difference signal immediately before the switching signal a is switched from "H" to "L", as in the signal processing circuit 22 (of FIG. 3) described above. Numerical data n corresponding to the level
It is possible to use the result of processing the above as the numerical data m supplied to the operating point setting circuit 23 after the switching signal a is switched from "H" to "L". Further, the arithmetic processing unit 28
Is the operating point setting after the switching signal a is switched from "H" to "L" by calculating the average value by performing the arithmetic processing of the numerical data n during the period when the switching signal a is "H". It is also possible to use the numerical data m supplied to the circuit 23.

The effect of using the average value in the above arithmetic processing is as follows. Some disturbance is temporarily applied to the magnetic recording / reproducing apparatus that is performing continuous recording, causing a disturbance in the rotational speed of the capstan motor immediately before the switching signal a is switched from "H" to "L", If the level of the phase difference signal deviates from the level when the phase is originally synchronized, the switching signal a
Holds the numerical data n corresponding to the level of the phase difference signal immediately before switching from "H" to "L", and after the switching signal a switches from "H" to "L", the operating point setting circuit 23
If the numerical data m to be supplied to is determined, there is a risk that the phase relationship between the phase signal h during the recording of the new video signal and the reference synchronization signal e will shift. By performing the arithmetic processing of the numerical data n during the period when the switching signal a is "H" and calculating the average value, the temporary fluctuation of the phase difference signal level is absorbed, and the result is switched. After the signal a is switched from "H" to "L", the operating point setting circuit 23
By setting the numerical data m to be supplied to, the phase relationship between the phase signal h during the recording of the new video signal and the reference synchronization signal e is kept constant.

FIG. 5 is a circuit diagram showing one specific example of the operating point setting circuit 23 in FIG. 1, in which 29 is a rising edge detection circuit, 30 is a counter, and 31 is a comparator, corresponding to FIG. Are given the same reference numerals. The operation of this specific example will be described below with reference to FIG. 6 showing the signal waveforms of the respective parts of FIG.

The phase signal h output from the frequency divider 17 is
It is supplied to the rising edge detection circuit 29. The rising edge detection circuit 29 generates a pulse having a constant time width from the rising edge of the phase signal h, and this pulse is supplied to the counter 30 as a reset pulse o.

The counter 30 counts the reference signal d from the reference signal generator 12 as a clock and is reset every reset pulse o. Therefore, the count value p of the counter 30 sequentially increases from zero every time the reference signal d is supplied after being reset by the reset pulse o. The counter value p is supplied to the comparator 31 together with the numerical value data m supplied from the signal processing circuit 22. The comparator 31 compares the counter value p with the numerical data m, and is a pulse signal which is “H” when the count value p is smaller than the numerical data m and is “L” when the count value p is the numerical data m or more. generate k.

As described above, the pulse signal k is supplied to the counter 3
It rises when 0 is reset by the reset pulse o,
When the count value p coincides with the numerical data m supplied from the signal processing circuit 22, it falls, so that its rising edge coincides with the rising of the phase signal h, and the numerical data m determines the time width of the "H". ..

Here, the frequency divider 13 is preset by the preset signal j obtained from the falling edge of the pulse signal k, so that the rising edge of the phase signal h corresponds to the sloped rising edge of the trapezoidal wave f (FIG. 2). The reference synchronization signal e is set to a phase delayed from the center and such that the level of the phase difference signal output from the phase comparator 14 matches the level of the phase difference signal before the start of recording the new video signal. As described above, the numerical data m is set in the signal processing circuit 22.

In the above description, the case where the phase control of the capstan motor is performed using the control signal recorded in the longitudinal direction (linear track) of the magnetic tape (for example, in the case of the VHS format of a domestic VTR) is taken as an example. As mentioned above, when the phase control of the capstan motor is performed by using the pilot signal recorded in the video signal recording track direction of the magnetic tape (for example, 8 mmV of a home VTR).
It is needless to say that the same effect can be obtained even in the case of TR format).

[0040]

As described above, according to the present invention,
The fluctuation of the phase difference voltage before and after the start of recording the new video signal is eliminated, the running of the magnetic tape becomes smooth at the start of recording the new video signal, and smooth continuous shooting becomes possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a signal waveform of each part of FIG.

FIG. 3 is a block diagram showing an example of the signal processing circuit of FIG.

FIG. 4 is a block diagram showing another example of the signal processing circuit of FIG.

5 is a block diagram showing an example of an operating point setting circuit in FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing signal waveforms of respective parts of the operating point setting circuit of FIG.

FIG. 7 is a block diagram showing a main configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 8 is an explanatory diagram showing signal waveforms of respective parts of FIG.

FIG. 9 is an explanatory diagram of signal waveforms for showing conventional problems.

[Explanation of symbols]

 1 magnetic tape 2 capstan shaft 3 capstan motor 4 pinch roller 5 control head 6 input terminal 7 frequency divider 8 switch 9 recording amplifier 10 switch 11 system controller 12 reference signal generator 13 frequency divider 14 phase comparator 15 motor drive Circuit 16 Frequency generator 17 Frequency divider 18 Reproduction amplifier 19 Switch 20 Preset pulse generator 21 Pause switch 22 Signal processing circuit 23 Operating point setting circuit 24 Switch 25 Hold circuit 26 Inversion amplifier 27 Analog-digital converter 28 Arithmetic processing unit 29 Rising Edge detection circuit 30 Counter 31 Comparator a Switching signal b Vertical synchronization signal c Frame synchronization signal d Reference signal e Reference phase signal f Trapezoidal wave g Control signal h Phase signal i Frequency signal j Preset signal k Pulse signal l hold output m numerical data n numeric data o reset pulse p counter value E Power F phase difference signal level

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Yokoyama 5-22-1 Kamisuihoncho, Kodaira-shi, Tokyo Inside Hitachi Microcomputer System Co., Ltd. 22-1 No. 1 In Hitachi Microcomputer System Co., Ltd.

Claims (7)

[Claims] 1. A continuous shooting function for recording a second signal continuously from a first signal previously recorded on the magnetic tape, comprising a magnetic tape running unit for running the magnetic tape, and When recording the first signal, the first phase information indicating the first signal recording phase is simultaneously recorded, and at the time of the second signal recording, the second phase information indicating the recording phase of the second signal is simultaneously recorded. In a magnetic recording / reproducing apparatus having a recording function, means for performing a control operation of the magnetic tape running unit in a period for recording the second signal in the continuous shooting function is provided based on the first phase information. A magnetic recording / reproducing apparatus characterized in that 2. A continuous shooting function for recording a second signal continuously with a first signal previously recorded on the magnetic tape, comprising a magnetic tape running unit for running the magnetic tape, When recording the first signal, the first phase information indicating the first signal recording phase is simultaneously recorded, and at the time of the second signal recording, the second phase information indicating the recording phase of the second signal is simultaneously recorded. In a magnetic recording / reproducing apparatus having a recording function, the setting of an initial state of the control operation of the magnetic tape running unit during the recording of the second signal in the continuous shooting function is performed based on the first phase information. A magnetic recording / reproducing apparatus, characterized in that it is provided with a means for carrying out. 3. The pulse signal synchronized with the rotation phase of the rotating cylinder according to claim 1, wherein the magnetic head mounted on the rotating cylinder records the first signal or the second signal on the magnetic tape. Is recorded in the longitudinal direction (linear track) of the magnetic tape by another magnetic head, and the pulse signal is used as the first phase information. 4. The magnetic head mounted on a rotary cylinder according to claim 1, wherein the first signal or the second signal is recorded on the magnetic tape, and the first signal or the second signal is recorded. And a tracking information signal having a frequency different from that of the first signal or the second signal.
Magnetic recording / reproducing apparatus, wherein the tracking information signal is used as the first phase information. 5. The first detection according to claim 1, wherein the first detection is performed to control the continuous shooting function.
The magnetic recording / reproducing apparatus is characterized in that the first phase information recorded in a fixed section immediately before the recording of the second signal is mainly used as the phase information of the above. 6. The first detection according to claim 1, wherein the first detection is performed for controlling the continuous shooting function.
The magnetic recording / reproducing apparatus is characterized in that the result of averaging the first phase information recorded in a certain section immediately before the start of recording the second signal is mainly used as the phase information. 7. The magnetic recording / reproducing apparatus according to claim 1, wherein at least a part of the processing of the first phase information is realized by an arithmetic processing function of an arithmetic processing device such as a microcomputer.