JP2951494B2 - Magnetic recording device and tracking control method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking control technique in a recording / reproducing apparatus.

[0002]

2. Description of the Related Art For example, as a helical scanning type magnetic recording / reproducing apparatus, a video tape recorder (hereinafter referred to as "VT")
R ") is known. As the tracking control of the VTR, the ATR used in an 8 mm VTR or the like is used.
The TF method is known.

Hereinafter, the ATF system will be described.

According to the ATF system, pilot signals f1 to f4 are superimposed on recording information and sequentially recorded on a magnetic tape for each track. Also, the frequency of each pilot signal is f1 {6.5fH, f2 {7.5fH, f3}.
10.5fH, f4 ≒ 9.5fH (fH: horizontal synchronization signal frequency of television signal = 15.734 kHz). Thus, the pilot signal frequency difference between adjacent tracks on the magnetic tape is always fH or 3fH.

Therefore, in the ATF system, the crosstalk components from both adjacent tracks included in the reproduced signal are detected to extract the difference frequency components fH and 3fH, and the capstan motor 1 is controlled so that the levels of the two become equal. The tracking control is performed by controlling.

[0006] It is generally known that the tracking control band should be widened in order to increase the response speed of the tracking control. However, as described above, in the ATF system using a pilot signal of four frequencies, a disturbance having a quarter field period occurs due to a level difference between the pilot signals, a mounting error of a head on a rotary cylinder, and the like. That is, the VT adopting the NTSC system
In R, disturbance of a specific frequency of 15 Hz and an integral multiple thereof occurs. For this reason, if the response band of the tracking control is widened, the jitter characteristic is deteriorated.

Therefore, in the device described in Japanese Patent Application Laid-Open No. 3-168957, a notch filter (hereinafter, referred to as a "disturbance suppression filter") for suppressing the specific frequency is provided so that the band of tracking control can be expanded. .

[0008]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 3-168 is disclosed.
According to the apparatus described in Japanese Patent Application Laid-Open No. 957, in a normal reproduction mode, it is possible to secure a necessary gain and response band, and realize stable tracking control in which disturbance at a specific frequency is suppressed.

However, depending on the operation mode of the VTR,
Further, there is a case where a wideband and high-speed tracking control is required.

[0010] For example, in the case of so-called splicing recording in which recording is continuously performed on a pre-recorded tape, it is necessary to make track patterns continuous in order to prevent image distortion at the spliced portion. Playback and start tracking after adjusting the tracking, but if it takes time to pull in the tracking, the time from the recording command to the actual start of recording must be long, and the scene immediately after the recording start command Is not recorded. Also, when recording, recording pause, and recording are repeated with the video camera, after the recording is stopped, the recording is rewound and temporarily set to the recording pause state. However, similarly, if it takes time to pull in the tracking, there is a problem that the scene immediately after the recording start command is not recorded.

On the other hand, according to the apparatus disclosed in Japanese Patent Application Laid-Open No. 3-168957, the high speed required at the time of pulling in the tracking before the start of the splicing shooting is sufficiently achieved due to the phase delay caused by the disturbance suppression filter. , The high-speed tracking control cannot be realized.

Therefore, the present invention provides an
An object of the present invention is to provide a magnetic recording / reproducing device capable of performing high-speed tracking control.

[0013]

To achieve the above object,
The present invention provides a magnetic recording and reproducing apparatus for recording a signal on a track formed on a magnetic recording medium, a magnetic head for detecting a signal recorded in a track on the magnetic recording medium, the magnetic head is detected specific frequency component contained from the signal, the tracking error detecting means for generating a tracking error signal representing a deviation amount with respect to the track of the magnetic head, the tracking error signal the tracking error detection means generated when the on state the output is attenuated, and the preparative <br/> tracking oppression filter tracking error signal error detecting means has produced you output transparently in the off state, the tracking error signal the suppression filter outputs Adjust gain
And gain adjustment means for gain-adjusting by the gain adjustment means
Means for adjusting the relative motion between said magnetic recording medium and the magnetic head in accordance with the value of the integer tracking error signal, on to control the on / off state of the suppression filter
/ Off control means, and tracking control means including
The gain adjuster turns on the suppression filter.
Control characteristic margin of the tracking control means when
When the suppression filter is turned off.
According to the difference of the control characteristic margin of the tracking control means,
Tracking output from the suppression filter in the off state
From the suppression filter in the ON state.
Greater than the gain of the output tracking error signal
A magnetic recording / reproducing apparatus is provided.

[0014]

According to the magnetic recording / reproducing apparatus of the present invention, the on / off state of the disturbance suppression filter and the gain of the amplifier can be switched. Here, when the disturbance suppression filter is turned off, there is no phase delay due to the disturbance suppression filter, and the gain margin of the tracking control system is reduced.
As phase margin increases, stability is maintained. It is possible to increase the gain of the amplifier by the increase in the margin.

Therefore, at the time of tracking pull-in,
The tracking control can be speeded up by turning off the disturbance suppression filter and increasing the gain of the amplifier. Accordingly, it is possible to reduce the running time for the transition shooting and the tracking time for shifting from the stop state to the playback state. Furthermore, when playing back a tape that has a blank section in the middle, or when playing back a seamless recording tape with a discontinuous track pattern, speeding up the tracking control will minimize video disturbance. Can be.

In any case, in the steady state after the tracking is pulled in, the gain amount of the amplifier is reduced and the disturbance suppression filter is turned on, whereby a stable image with suppressed jitter can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described below with reference to application to a VTR.

First, a first embodiment will be described.

FIG. 1 shows the configuration of the servo control system of the VTR according to the first embodiment.

In the figure, 1 is a capstan motor, 2 is a motor driver for driving the capstan motor 1, 3 is a frequency generator for generating a signal proportional to the rotation frequency of the capstan motor, and 4 is the cycle of this signal. A speed control circuit that generates a speed error signal from a difference from a target cycle and controls the motor to rotate at a constant speed.

Numeral 5 is a magnetic head for reading a recording signal from a magnetic tape, 6 is an ATF error detection circuit for detecting an ATF error signal from a reproduced signal, 7 is a disturbance suppression filter, and 8 is an on / off of a disturbance suppression filter. Is a variable gain amplifier for amplifying the tracking error signal, 10 is a phase control circuit for compensating the phase of the tracking error signal, 11 is an adder, and 12 is a system controller.

In such a configuration, the tracking error signal that has passed through the variable gain amplifier 9 is subjected to processing such as phase compensation filtering in the phase control circuit 10 and then added to the speed error in the adder 11 and added to the motor driver 2. Can be The gain characteristic of the open-loop transmission characteristic of the tracking servo can be changed by setting the gain of the variable gain amplifier 9. The tracking servo control band is
If the open loop gain is defined as a frequency band of 0 dB or more, the control band can be widened and the response can be speeded up by increasing the gain.

The system controller 12 includes a switch 8
, And controls the gain amount of the variable gain amplifier 9.
In addition, the system controller 12 performs overall control of the magnetic recording / reproducing device according to a command from the operation panel.

Next, FIG. 3 shows the configuration of the ATF error detection circuit 6 according to the first embodiment.

In the figure, 23 is a preamplifier, 24 is an LPF
(Low-pass filter), 25 is an AGC amplifier (automatic gain control amplifier), 26 is a balanced modulator, 27 is a frequency divider, 28
Is a clock generator, 30 and 31 are band pass filters (BPF), 32 is a switch, 34 and 35 are envelope detectors, 36 is a subtractor, and 29 and 33 are input terminals. It is also assumed that pilot signals f1 to f4 are sequentially recorded on the magnetic tape 100 so as to be superimposed on recording information for each track. The frequency of each pilot signal is f1 ≒ 6.5fH, f2 ≒ 7.5fH, f3
≒ 10.5fH, f4 ≒ 9.5fH.

In FIG. 3, a disturbance suppression filter 7, a switch 8, a variable gain amplifier 9, a phase control circuit 10
Are collectively indicated by reference numeral 110.

The reproduced signal reproduced by the magnetic head 5 is supplied to the LPF 24 after being amplified by the preamplifier 23. L
The PF 24 suppresses high-frequency components such as video or audio information unnecessary for tracking control, extracts a reproduced pilot signal, and supplies the reproduced pilot signal to the AGC amplifier 25. AGC amplifier 2
5 amplifies the reproduced pilot signal to an appropriate level and supplies it to the balanced modulator 26.

The balanced modulator 26 multiplies the reproduced pilot signal by the local pilot signal supplied from the clock frequency dividing circuit 70, and converts the pilot signals of both adjacent tracks of the main track reproduced by the magnetic head 5 to fH and The signal is converted into a signal having a frequency of 3fH. As the local pilot signal, a signal having the same frequency as the pilot signal of the main track is used.

The fH-BPF 30 extracts the fH signal of the frequency fH, and the 3fH-BPF 31 extracts the 3fH signal of the frequency 3fH.
Extract the signal. The extracted fH signal and 3fH signal are supplied to the envelope detection circuit 34 or the envelope detection circuit 35 via the switch 32.

The switch 32 responds to a control signal HSW (head switch pulse) supplied from the input terminal 33.
The switching is performed every track scanning cycle. This switch 32
Is to cope with the relationship between the pilot signal of the preceding / following track and the frequency-converted fH / 3fH signal changing for each track.

The envelope detection circuit 34 and the envelope detection circuit 35 detect the envelope levels of the supplied fH signal and 3fH signal, respectively, and supply them to the subtraction circuit 36, respectively. The subtraction circuit 36 performs a subtraction between the level of the fH signal and the level of the 3fH signal, and outputs the result. This output becomes the ATF error signal.

Next, the configuration of the disturbance suppression filter 7 is shown in FIG.

In the figure, 47 is an A / D converter, 61 is a delay element, 62 is a coefficient unit, 63 is an adder, and 64 is a D / A converter. The sampling frequency of the A / D converter 47 is 60 Hz of the field frequency, and the delay time of the delay element 61 is
The coefficient of the coefficient unit 62, which is one sampling period, is 1/4.
And

FIG. 5 shows the transfer characteristics of the disturbance suppression filter 7.

As shown, the disturbance suppression filter 7
Is an integral multiple of 15 Hz (excluding an integral multiple of the sampling frequency). Accordingly, the disturbance suppression filter can remove a disturbance component having a frequency that is an integral multiple of a quarter field period.

On the other hand, the phase delay of the disturbance suppression filter 7 is about 45 degrees at 5 Hz and about 90 degrees at 10 Hz. Accordingly, if the gain is increased and the tracking control band is widened to slightly less than 10 Hz, the phase margin is not sufficient and the stability of the system cannot be secured.

The configuration of the disturbance suppression filter 7 is shown in FIG.
However, the present invention is not limited to the configuration shown in FIG. For example, instead of using a digital filter as shown in FIG. 5, a trap filter may be used to suppress disturbance by analog signal processing.

Hereinafter, the operation of the VTR according to the first embodiment in the case where the tracking adjustment is performed before the recording, such as transition shooting and recording>pause> recording, will be described.

FIG. 2 shows the operation sequence of the VTR in this case.

As shown in the figure, in this case, after the recording is stopped (point A), the tape is temporarily rewound (AB), further forwardly rotated and the tape is advanced and stopped (point C), and the standby state is established. become. Then, when a recording command is input, the tape is advanced while reproducing (running-up period CD), the tracking is adjusted, and then recording is started. This control is performed by the system controller 12 in response to an instruction from the operation panel 13.

In the present embodiment, the system controller 12 controls the switch 8 to select a path that does not pass through the disturbance suppression filter 7 (select the side b in FIG. 1) only during this approach period. As a result, the ATF error signal output from the ATF error detection circuit is input to the variable gain amplifier 9 without passing through the disturbance suppression filter 7.

As described above, by selecting a path that does not pass through the disturbance suppression filter, the phase delay (about 45 degrees at 5 Hz) due to the disturbance suppression filter 7 described above is eliminated, so that the gain margin is greatly increased. Therefore, the system controller 12 controls the variable gain amplifier 9 to increase the gain amount of the variable gain amplifier 9 during the run-up period by the increased gain margin. When the pull-in of the tracking is completed, the system controller 12 controls the switch 8 to select a path passing through the disturbance suppression filter 7 (selects the side a in FIG. 1) and controls the variable gain amplifier 9 to control the gain amount. Is lowered to a predetermined level at which the stability can be secured.

Thus, during the approach period, the gain and the bandwidth of the tracking control system can be expanded while maintaining the stability of the system, and high-speed tracking can be performed. On the other hand, during the tracking pull-in period, since no video is output, deterioration of the jitter characteristic is not a problem.

Hereinafter, a second embodiment of the present invention will be described.

The second embodiment relates to a VTR which performs servo control by digital signal processing or arithmetic processing using a microcomputer.

FIG. 6 is a configuration diagram according to the second embodiment.

In the figure, 41 is a frequency generator, 42 is a sampling circuit, 43 is a period measuring circuit, 44 and 48 are subtractors, 45 and 49 are coefficient circuits, 46 is a low-pass filter,
47 is an A / D converter, 50 and 52 are phase compensation filters,
51 is a timer, 53 is an operating point compensation circuit, 54 is a pulse width modulator (PWM), 55 is a PWM carrier suppression filter, and 56 is a current amplifier. The other parts are equivalent to the parts indicated by the same reference numerals in FIG.

In such a configuration, the speed control and tracking control of the capstan motor are performed as follows.

That is, the period of the FG signal generated according to the rotation angle of the capstein motor 1 is determined by the period measuring circuit 43.
And a difference from the target cycle, that is, a speed error is obtained.

Then, the signal is amplified by the coefficient circuit 45 so as to have appropriate servo characteristics, added to the tracking error signal output from the phase compensation filter 50, and then subjected to phase compensation filtering by the phase compensation filter 52. After the operating point is adjusted by the compensation circuit 53, this signal is output from the PWM 54 as a motor control signal,
6 to the motor driver.

Here, the tracking error signal is obtained as follows.

That is, after the ATF error signal obtained by the ATF error detection circuit 6 is band-limited by the low-pass filter 46, it is converted into a digital signal by the A / D converter 47. Subsequent tracking control is performed by digital signal processing or arithmetic processing using a microcomputer.

At the time of normal reproduction, the disturbance component of the frequency component of 15 Hz and an integral multiple thereof is suppressed by the disturbance suppression filter 7, and then a difference from a reference value is calculated to generate a tracking error signal. In the coefficient unit 49 and the phase compensation filter 50, processes such as amplification and phase compensation filtering are performed so that Then, as described above, the result is added to the speed error signal output from the coefficient unit 45 and is provided to the phase compensation filter 52.

On the other hand, the system controller 12
It controls the sampling frequency of the D converter 47, opening and closing of the switch 8, setting of the coefficient of the coefficient unit 49, the filter constant of the phase compensation filter 50, and the like.

Now, also in the second embodiment, the first
In the same way as in the embodiment, the connection shooting and recording> pause
When the tracking adjustment is performed before recording as in the case of recording, the b side is selected by the switch 8 during the run-up period and the disturbance is not passed through the disturbance suppression filter. As a result, the phase lag of the disturbance suppression filter is eliminated, so that the gain margin is increased. Therefore, the gain of the divider 49 is increased, the gain and the band are widened, and high-speed tracking can be performed.

Hereinafter, a third embodiment of the present invention will be described.

In the third embodiment, the phase lock detector 70 is provided in the VTR according to the second embodiment.

Now, in a tape spliced according to the normal procedure, the recording pattern and the rotation of the recording pilot are continuous. For example, as shown in FIG. In some cases, the tracks are discontinuous and the pilot rotation is shifted as shown in FIG.

When such a tape is reproduced, tracking is disturbed due to a non-recorded portion or a discontinuous portion of a track, and it takes time until the tape is pulled in again.

Therefore, in the third embodiment, the phase lock detector 70 observes the level of the tracking error signal, and when the phase lock is lost, turns off the disturbance suppression filter and increases the gain to perform tracking control. Speed up.

FIG. 9 shows the configuration of the ATF error detection circuit 6 and the phase lock detector 70 according to the third embodiment.

Reference numeral 71 denotes a comparator, 72 denotes a phase lock detector,
46 is a low-pass filter, 47 is an A / D converter, and other components are the same as those described above with reference to FIG.

The operation of the ATF error detection circuit 6 and the phase lock detector 70 according to the third embodiment will be described below.

As described above, the ATF error detection circuit 6 uses the local pilot signal of the same frequency as the pilot signal of the main track to be scanned, and detects the pilot signals of both adjacent tracks. Is the frequency of the pilot signal of the following track or the preceding track, the pilot signal of the main track and the adjacent track of the main track can be detected.

When the phase control is locked,
The pilot signal of the main track is sufficiently larger than the pilot signal of the adjacent track, and the difference signal between them becomes a certain level. On the other hand, in the transient state until the phase is locked, the level of the difference signal does not become constant but fluctuates according to the relative position between the head and the track. Accordingly, by monitoring the level fluctuation of the difference signal between the main track and the adjacent track, it can be determined whether or not the phase is locked.

Therefore, in the third embodiment, during normal reproduction, the ATF error detection circuit 6 switches between the local pilot signal for tracking control and the local pilot signal for lock determination during scanning of one track, and , A level difference signal between the pilot signals of both adjacent tracks, that is, an ATF error signal, and a difference signal between the pilot signal of the main track and the pilot signal of the adjacent track adjacent to the main track are sequentially obtained. And A / D
The converter 47 outputs an ATF error signal for tracking control, the phase lock detector 70 outputs a difference signal between a pilot signal of a main track and a pilot signal of an adjacent track adjacent to the main track for detection of phase lock loss, and a low-pass filter 46. Sampling at timings corresponding to the signals to be sampled.

FIG. 10 shows the sampling timing.

(A) shows a pilot signal recorded on the main track, (B) shows a local pilot signal,
(C) shows an ATF error signal, and (D) shows an A / D converter 4.
7 shows a sampling pulse of FIG. 7 and (E) shows a sampling pulse of the phase lock detector 70.

The switching of the reference signal is performed by the system controller 12 switching the frequency division ratio of the frequency dividing circuit 27.

Now, it is assumed that the switch 32 is controlled so that the pilot signal of the main track is input to the + input of the subtractor 36 and the pilot signal of the adjacent adjacent track is input to the-input. At this time, if the phase is locked, the output of the subtractor 36 has a large positive value. If the reference potential of the comparator 71 is set to an appropriate level smaller than this, the output of the comparator 71 becomes high level, and when the phase is not locked, it becomes high or low level.

The phase lock detection circuit 72 samples the output of the comparator 71 at the timing shown in FIG. 9 (E). If the sampled value is continuously at a high level for a predetermined period, it is determined that the phase is locked. Otherwise, it is determined that it is not locked, and this is transmitted to the system controller 12.

Therefore, the system controller 12 controls the switch 8 according to the information transmitted from the phase lock detector 70 when it is not locked, to turn off the disturbance suppression filter 7, , The response speed priority control is performed by increasing the gain, and if locked, the switch 8 is controlled to turn on the disturbance suppression filter and the gain of the coefficient unit 49 is reduced to perform the jitter performance priority control. .

The third embodiment is characterized in that the tracking control state such as the phase lock state is detected and the control characteristics are changed, and the tracking control state such as the phase lock state is detected by the present embodiment. A method other than that shown in the third embodiment may be used.

In the first, second, and third embodiments, the tracking control system may be operated as follows during transition from the stop state to the reproduction mode.

That is, when the reproduction is started from the stop state, the system controller 12 controls the switch to turn off the disturbance suppression filter, and at the same time, increases the gain to widen the band and speed up the response. After the reproduction is started, the time is measured by a timer, and when a predetermined period has elapsed, a switch is switched to operate the disturbance suppression filter and reduce the gain to a predetermined value. This shortens the time required for tracking after startup,
In a steady state, an image in which disturbance is suppressed can be obtained.

In the above description of the embodiment, the disturbance suppression filter is described as a notch type filter. However, although the effect of disturbance suppression is reduced, a filter showing general low-pass filter characteristics may be used.

In the above embodiment, application to a VTR device employing the ATF system has been described as an example.
The other magnetic recording / reproducing devices adopting the ATF method or the similar tracking control method also have the above-described embodiments that turn on / off the disturbance filter according to the operation mode.
The off control and the gain switching control can be similarly applied.

As described above, according to the embodiments of the present invention, a stable image can be obtained by the effect of the disturbance suppression filter at the time of normal reproduction. The speed of the tracking control can be increased. Also, by providing a phase lock detection circuit and performing the same control when it is detected that tracking has deviated, it is possible to reduce the tracking recovery time.

[0079]

As described above, according to the present invention, it is possible to provide a magnetic recording / reproducing apparatus capable of performing high-speed tracking control according to an operation mode.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a servo control system of a VTR according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation at the time of splicing and taking a VTR according to the first embodiment of the present invention;

FIG. 3 is a block diagram illustrating a configuration of an ATF error detection circuit according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a disturbance suppression filter according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating characteristics of a disturbance suppression filter according to the embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a servo control system of a VTR according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a servo control system of a VTR according to a third embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a recording state of a magnetic tape.

FIG. 9 is a block diagram illustrating a configuration of an ATF error detection circuit and a phase lock detector according to a third embodiment of the present invention.

FIG. 10 is a timing chart showing operations of an ATF error detection circuit and a phase lock detector according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capstan motor 4 Speed control circuit 6 ATF error detection circuit 7 Disturbance suppression filter 8 Switch 9 Variable gain amplifier 10 Capstan phase control circuit 12 System controller 13 Operation panel 45 Coefficient unit 49 Coefficient unit 51 Timer 70 Phase lock detection circuit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akifumi Mibe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi, Ltd. Visual Media Research Laboratory (72) Inventor Yoshio Narita 1410 Inada, Katsuta-shi, Ibaraki Hitachi, Ltd. In the AV Equipment Division of the Manufacturing Company (72) Inventor Yukinobu Tada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Video Media Research Laboratory (56) References JP-A-2-66763 (JP, A) JP-A Heihei 3-168957 (JP, A) JP-A-4-301254 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 15/467

Claims (8)

(57) [Claims] 1. A magnetic recording and reproducing apparatus for recording a signal on a track formed on a magnetic recording medium, a magnetic head for detecting a signal recorded in a track on the magnetic recording medium, the magnetic head from the detection signal, the tracking error detecting means for generating a tracking error signal representing a deviation amount with respect to the track of the magnetic head, a specific frequency which the tracking error detecting means is included in the generated tracking error signal when the on state outputs attenuates the components, adjusting the tracking error detecting means oppression filter you output transparently tracking error signal generated by the gain of the tracking error signal in which the suppression filter outputs in the off state Gain adjusting means, and the gain adjusting means
And on / off control means for controlling the means for gain adjusting the relative motion between said magnetic head in accordance with the value of the tracking error signal adjusted the magnetic recording medium, an on / off state of the suppression filter by, Tracking including
Control means, wherein the gain adjustment means turns on the suppression filter.
The control characteristic margin of the tracking control means when
When the suppression filter is turned off.
Off according to the difference in the control characteristic margin of the locking control means
Tracking error output from the suppression filter
Output from the suppression filter in an on state.
A magnetic recording / reproducing apparatus characterized in that the gain is larger than the gain of the tracking error signal . 2. A magnetic recording and reproducing apparatus for recording by superimposing a pilot signal of the sequential four different frequencies on a track formed on a magnetic tape in cyclically recording signals by a helical scanning method, for driving the magnetic tape A capstan motor, a magnetic head for detecting a signal recorded on a track on the magnetic tape by a helical scanning method, and a track included in the signal detected by the magnetic head, the track on which the magnetic head detects a signal. Tracking error detecting means for generating a tracking error signal indicating an amount of deviation of the magnetic head from the track from a level of a crosstalk component of the pilot signal recorded on an adjacent track; A specific circuit included in the tracking error signal generated by <br/> and the attenuated wave number component output, and suppression filter for outputting a tracking error signal transparently to the tracking error detecting means has produced in the off state, the gain of the tracking error signal the suppression filter outputs adjust
Gain adjusting means, and the gain is adjusted by the gain adjusting means.
And means for adjusting the operation of said capstan motor according to the value of the tracking error signal, and on / off control means for controlling the on / off state of the suppression filter, the
Tracking control means, wherein the gain adjustment means turns on the suppression filter.
The control characteristic margin of the tracking control means when
When the suppression filter is turned off.
Off according to the difference in the control characteristic margin of the locking control means
Tracking error output from the suppression filter
Output from the suppression filter in an on state.
A magnetic recording / reproducing apparatus characterized in that the gain is larger than the gain of the tracking error signal . 3. A magnetic recording / reproducing apparatus according to claim 1, wherein:
In the on / off control means, the suppression filter is turned off when pull tracking, the tracking pull
A magnetic recording / reproducing apparatus , wherein the suppression filter is turned on when writing is completed . 4. A magnetic recording / reproducing apparatus according to claim 1 or 2.
In the on / off control means, splicing of running period, before
The serial suppression filter is turned off, the period other than the run-up period
A magnetic recording / reproducing apparatus , wherein the suppression filter is turned on during the period . 5. A magnetic recording / reproducing apparatus according to claim 1 or 2.
In the on / off control means, a predetermined period after the start of reproduction, before
The serial suppression filter is turned off, again other than the predetermined period
A magnetic recording / reproducing apparatus , wherein the suppression filter is turned on during a live period . 6. A magnetic recording / reproducing apparatus according to claim 1 or 2.
In, further comprising a tracking state detecting means for detecting a tracking state with respect to the track of the magnetic head, the on / off control means, in response to a tracking state in which the tracking state detecting unit detects, wherein the suppression off <br / > magnetic recording and reproducing apparatus characterized by controlling the oN / oFF state of the filter. 7. A magnetic recording and reproducing apparatus smell of claim 6, wherein
Te, the tracking state detection means, from the signal which the magnetic head is detected, which detects the locked state of tracking with respect to the track of the magnetic head, the on / off control means, the tracking state detection
When the locked state of tracking detected by the means is deteriorated, the suppression filter is turned off, and
A magnetic recording / reproducing apparatus, which is turned on in the case of the above . 8. A tracking control method for controlling the tracking of the recording and reproducing apparatus for recording a signal on tracks formed on a recording medium, in a state where the tracking is completed, is recorded in the track on the recording medium From the signal detected by the head that detects the signal, a tracking error signal indicating the amount of deviation of the head from the track is generated, a specific frequency component included in the tracking error signal is attenuated, and the specific frequency component is reduced. Amplify the attenuated tracking error signal , adjust the relative movement between the head and the recording medium according to the value of the amplified tracking error signal, and in a state where the tracking is in the pull-in process, the track on the recording medium is A signal detected by a head for detecting a recorded signal is located in front of the head. A tracking error signal indicating the amount of deviation from the recording track is generated, and the generated tracking error signal is used as the tracking completion signal.
In response to the fluctuation of the control characteristic margin of the tracking control caused by the elimination of the attenuation processing of the specific frequency component contained in the tracking error signal applied in the
The gain applied in the tracking completed state
A tracking control method comprising : amplifying the gain so as to be larger than a width gain; and adjusting a relative motion between the head and the recording medium according to the value of the amplified tracking error signal.