JPH0687331B2 - Tracking controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field B Outline of Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving Problems (Fig. 1) F Action G Example G ₁ Configuration of Tracking Control Device G ₂ Operation of Tracking Control Device G ₃ Example of Circuit of Switched Capacitor Filter H Effect of Invention A Field of Industrial Application The present invention relates to a recording / reproducing device for recording / reproducing a video signal, an audio signal or the like using a rotary head. The present invention relates to a tracking control device.

B. SUMMARY OF THE INVENTION The present invention is an apparatus for performing tracking control by detecting a tracking error signal at the time of reproduction by using a pilot signal cyclically recorded by changing a frequency for each track together with an information signal by a rotary head. The filter for signal detection is composed of a switched capacitor filter, and the center frequency of this switched capacitor filter is changed according to the running speed of the tape, so that the tape speed can be changed with a simple circuit configuration using few filters. The tracking control device dealt with can be obtained.

C Conventional technology In a popular home-use VTR, when performing tracking control in which the rotary head during reproduction correctly operates on a recording track, conventionally, a control signal track formed in the longitudinal direction of the tape using a fixed magnetic head. The playback control signal from is used. However, the method of using such a fixed magnetic head is disadvantageous in view of the widening of the tape and the mounting location of the fixed head when it is desired to downsize the recording / reproducing apparatus.

Therefore, a method of tracking control without using such a fixed head has been proposed. This method is disclosed, for example, in Japanese Patent Laid-Open No.
-116120 and Japanese Patent Laid-Open No. 59-65962, a low frequency tracking pilot signal is recorded and reproduced by a rotary head on a track for recording a video signal by superimposing it on the track. At this time, the tracking servo is performed by detecting the crosstalk amount of the pilot signal from the adjacent track. Therefore, the pilot signal is frequency-multiplexed and recorded as a low-frequency side signal where the recorded signal of the video signal does not exist in the frequency spectrum so that it can be easily separated at the time of reproduction, and the pilot signal is selected to have a small azimuth loss. It

The outline of this tracking control method will be described first.

In this example, pilot signals of four different frequencies are cyclically frequency-multiplexed and recorded on an oblique track in a cyclic manner.
For example, two rotary heads H with different so-called azimuth angles
When recording is performed by a rotary head device in which A and HB are spaced 180 ° apart, these two rotations are performed when recording tracks are sequentially formed in a so-called overwriting state as shown in FIG. four different frequencies together with the recording of the video signal by the _{head, f 1, f 2, f} 3, 4 of the pilot signal f ₄ is changed sequentially for each track of each one by one as shown in FIG. 3 recycle It is recorded in advance.

That is, as shown in FIG. 3, one rotary head HA forms every other track T ₁ , T ₃ to record the FM-modulated video signal, and the track T ₁ has the frequency f ₁ of the frequency f ₁ . The pilot signal and the pilot signal of the frequency f ₃ are recorded on the track T ₃ in a superimposed manner. The other rotary head HB causes every other track T ₂ , T ₄
Are sequentially formed to record an FM-modulated video signal, and a track T ₂ is recorded with a pilot signal of a frequency f ₂ and a track T ₄ is recorded with a pilot signal of a frequency f ₄ being superimposed on each other. Is. And this truck T ₁
By through T ₄ are repeatedly recorded, but also pilot signals of four frequencies sequentially recycle recorded for these tracks T ₁ through T _4.

In this case, when reproducing, the head HA is in the state of just tracking when it correctly scans the tracks T ₁ and T ₃ .
The head HB is in the just tracking state when the tracks T ₂ and T ₄ are correctly scanned. Therefore the head
Assuming that the gap width of HA and HB matches the track width, when the heads HA and HB sequentially scan the tracks T _{1 to} T ₄ , in synchronization with this, the frequencies f ₁ to provides signals P ₁ to P ₄ of the f ₄ in multiplication circuit detects a frequency difference between the reproduced pilot signal, no frequency difference is obtained in a just tracking state.

On the other hand, if the tracking position is deviated as shown in (1) and (2) of the head position (this is the case of the head HA) in FIG. 3, the pilot of the frequency different from the reference pilot signal is detected from the adjacent track. Since the signal is obtained as crosstalk, a frequency difference is generated between the signal and the crosstalk signal, and the level difference is proportional to the amount of deviation.

Therefore, the tracking servo can be easily performed by selecting the frequencies f _{1 to} f ₄ so that the frequency difference becomes the same in the direction of deviation between the tracks T ₁ and T ₃ and T ₂ and T _4. Become. That is, Δf _A = | f ₁ −f ₂ | = | f ₃ −f ₄ | Δf _B = | f ₂ −f ₃ | = | f ₄ −f ₁ | In this way, the presence of the frequency difference Δf _A means a right shift with respect to the head HA and the left shift with respect to the head HB, and the presence of the frequency difference Δf _B causes a left shift with respect to the head HA, For the head HB, it means rightward shift, and the levels of the differences Δf _A and Δf _B are proportional to the shift amount.

Therefore, in principle, these frequency differences Δf _A and Δf _B indicate the tracking error amount, and if the tracking error amount is controlled to be zero, just tracking can be performed.

However, since the example of FIG. 3 is a case of so-called overwriting, as shown by the solid line (3) in FIG. It is in the state of just tracking.
That is, just tracking is performed when the levels of the frequency differences Δf _A and Δf _B are equal, and tracking control is performed by controlling the level difference between the differences Δf _A and Δf _B to be zero.

FIG. 4 is a block diagram of an example of the tracking control device.

This example is an example in the case of 8 mm video, for example, and the pilot signal is a signal lower than the band of the low-frequency conversion carrier color signal.

In FIG. 4, the reproduction outputs of the heads HA and HB are supplied to the switch circuit (13) via the rotary transformers (11A) and (11B), the head amplifiers (12A) and (12B), respectively, and the terminals (14) Head switching signal RFSW
This switch circuit (13) is the head by (Fig. 5A).
In synchronization with the rotation of HA and HB, the head HA or HB is alternately switched to one terminal and the other terminal for a period of 180 ° angular intervals for scanning the tape. Therefore, the output of the amplifier (15) is a signal in which the reproduction outputs of the head HA and HB are continuously connected, and this is the terminal (16).
Is supplied to the reproduction signal processing system.

The output of the amplifier (15) also has a bandpass filter (2
It is supplied to 1) and the pilot signal is extracted from the reproduced signal. The reproduction pilot signal from the bandpass filter (21) is supplied to the multiplication circuit (22).

On the other hand, a pilot signal generating circuit (23) is provided from which a reference pilot signal P ₁ of frequency f ₁ , f ₂ , f ₃ , f ₄ is generated.
P ₂ , P ₃ , and P ₄ are obtained and these are supplied to the switch circuit (24). This is to the switch circuit (24) is a select signal SL ₁ and SL ₂ is supplied from the switch control circuit (20), 1 Tsugakono switch of these select signals SL _1, SL ₂ by four frequency pilot signal It is selectively taken out from the circuit (24). The head control signal RFSW from the terminal (14) is supplied to the switch control circuit (20), the select signals SL ₁ and SL ₂ change at the rising and falling points of this signal RFSW, and the switch circuit (24) The obtained reference pilot signal is changed. For example, during the 180 ° period during which the head HA scans the track T ₁ , the signal P ₁ having the frequency f ₁ is used as a reference pilot signal from the switch control circuit (24), and the head HB scans the track T ₂ at 180 °. In the period of, the signal P ₂ of the frequency f ₂ is obtained by sequentially switching the signals P _{1 to} P _{4 of the four} frequencies as shown in FIG. 5B.

The reference pilot signal from the switch circuit (24) is supplied to the multiplication circuit (22). Therefore, the signals of the frequencies Δf _A and Δf _B of the difference between the reference pilot signal and the reproduced pilot signal are obtained from this multiplication circuit (22), and these are extracted by the bandpass filters (25) and (26), respectively. The signals are detected by the detection circuits (27) and (28), and are output as DC level outputs SA and SB. here,
The gains of the bandpass filters (25) and (26) are made equal to each other. Detection circuit (2
The detection outputs SA and SB in 7) and (28) have levels proportional to the amounts of the components of the frequency differences Δf _A and Δf _B , respectively, that is, the magnitude of the pilot signal included as crosstalk in the reproduced pilot signal. And the left adjacent track tracking amount.

These detection outputs SA and SB are supplied to the subtraction circuit (29), and the subtraction outputs SD of them are obtained from them. This subtraction output SD is a signal indicating which one of the left side and the right side is more displaced. As described above, the frequency difference Δf _A and Δf _B are
The direction of deviation is opposite between the scanning of the head HA and the scanning of the head HB.

Therefore, the output SD of the subtraction circuit (29) is directly supplied to one input end of the switch circuit (30), and the polarity is judged through the polarity inversion circuit (31) to be supplied to the other terminal of the switch circuit (30). To be done. And this switch circuit (3
0) is alternately switched by the head switching signal RFSW during scanning of the head HA and during scanning of the head HB, so that the amplifier (32) obtains the tracking error voltage SE corresponding to the direction of deviation. Therefore, if this is supplied to the capstan motor, tracking control is performed.

For example, when the head HA is in a state of scanning with the head displaced to the right as shown at position (2) in FIG. 3, the reproduction pilot signal from the low pass filter (21) is as shown in FIG. 5C. In FIG. 3, the pilot signal of the adjacent track on the right side is also included. Then, the fifth from the multiplication circuit (22).
As shown in FIG. D, the frequency differences Δf _A and Δf _B indicating the right shift for the heads HA and HB are obtained alternately for each scanning period. Therefore, the output SA of the detection circuit (27) is as shown in E of the same figure, the output SB of the detection circuit (28) is as shown in F of the same figure, and the subtraction output SD is as shown in G of the same figure. Then, the tracking error signal SE is in a state indicating an error of right shift as shown in FIG.

By the way, in 8 mm video, variable speed reproduction is often performed by setting the tape speed to a speed different from that during normal reproduction. In this case, unless the rotational speed of the rotary head is changed and the correction is performed, the relative speed of the rotary head to the tape deviates from the speed during recording, the reproduction pilot frequency also deviates by that amount, and the beat frequencies Δf _A and Δf _B also deviate. I will end up. Therefore, if the relative speed of the rotary head is greatly deviated,
The attenuation in the bandpass filters (25) and (26) becomes large, and as a result, the S / N of the tracking error detection system based on this reproduction pilot signal becomes poor, and eventually it becomes impossible to detect it. was there.

On the other hand, in the case of the 8 mm video described above, the pilot signal frequencies f ₁ , f ₂ , f ₃ and f ₄ are selected so as to be interleaved with the horizontal frequency f _H of the video signal and considered so as not to affect the video signal. However, in general, each signal is obtained by dividing the master clock from the crystal oscillator. For example, in the 8 mm video standard (for NTSC), the frequency f _M of the mask clock is f _M = 378 f _H and the frequencies f _{1 to} f
₄ and Δf _A and Δf _B are selected as follows.

_{f 1 = f M /58=6.517f H ≒} 102.542kHz f 2 = f M /50=7.560f H ≒ 118.949kHz f 3 = f M /36=10.500f H ≒ 165.207kHz f 4 = f M / 40 = 9.450f _H ≈148.686kHz Δf _A = f ₂ −f ₁ = 1.043f _H ≈16.407kHz Δf _A = f ₃ −f ₄ = 1.050f _H ≈16.521kHz Δf _B = f ₄ −f ₁ = 2.933f _H ≈46.144 kHz Δf _B = f ₃ −f ₂ = 2.940f _H ≈46.258kHz Looking at these frequencies, the pilot signal frequency is 4
Not all of the three frequencies are exactly interleaved with the horizontal frequency f _H , and their respective beat frequencies Δf _A or Δf _B are also subtly different.

Originally, the pass bands of the band pass filters (25) and (26) of the tracking error detection system are preferably as narrow as possible in terms of accuracy. If the center frequencies of the bandpass filters (25) and (26) of the tracking error signal detection system can be delicately shifted, even a narrow bandpass filter can handle the above difference in beat frequency. Since it has been difficult to shift the center frequency in the past, it is generally a fixed center frequency, and its value is selected to be an average value of each beat frequency, and the pass band width also covers the difference in beat frequency. It was relatively wide.

Therefore, the present applicant has previously proposed, for example, the one shown in FIG. 6 as a tracking control device which copes with the change in the reproduction pilot frequency and the beat frequency (Japanese Patent Application No. 60-244571). In the tracking control device shown in FIG. 6, the reproduction signal from the amplifier (15) is supplied to the high pass filter (41), and the luminance signal of the color video signal is obtained therefrom. This luminance signal is supplied to the demodulation circuit (42) for FM demodulation, and the demodulated output is supplied to the sync separation circuit (45) through the low-pass filter (43) and de-emphasis circuit (44) to obtain the sync signal. To be This sync signal is supplied to the half H killer circuit (46) to be a horizontal sync pulse from which the equalization pulse in the vertical blanking interval has been removed, and this is supplied to the PLL circuit (47), from which this horizontal sync pulse is generated. A master clock MCK having a frequency f _M = 378 f _H , for example, phase locked to is obtained.
Since this master clock MCK is phase-locked with the reproduction horizontal synchronizing pulse, it has a frequency corresponding to the relative speed deviation of the rotary head.

This master clock MCK is used for the first to fourth frequency dividing circuits (4
8 ₁ ) to (48 ₄ ) are supplied.

Then, the master clock MCK is divided by 1/58 in the frequency dividing circuit (48 ₁ ) to obtain a signal of frequency f ₁ from this, and also by 1/50 in the frequency dividing circuit (48 ₂ ). The frequency is divided and a signal of frequency f ₂ is obtained from this, and the frequency dividing circuit (48 ₃ )
In the frequency division circuit (48 ₄ ) is divided into 1/36 to obtain a signal of frequency f ₃ , and in the frequency division circuit (48 ₄ ) is divided into 1/40 to obtain a signal of frequency f ₄ .

Then, the signals from the frequency dividing circuits (48 ₁ ) to (48 ₄ ) are supplied to the switch circuit (24), and one of the frequencies is selected by the switching signals SL ₁ and SL ₂ from the switch control circuit (20). Signal is selectively extracted from this signal and supplied to the multiplication circuit (22) in the same manner as described above, and is multiplied by the reproduced pilot signal from the bandpass filter (21).

Thereafter, the switch circuit (30) is performed in exactly the same manner as the example of FIG.
A tracking error signal is obtained, and this is added to the speed error signal from the speed servo circuit from the terminal (33), and is supplied to the capstan motor (34) through the drive amplifier (32) to drive the rotary heads HA, HB. The tape phase shift amount is controlled so that the tracking phase is correct.

In the above example, the reference pilot signal is the PLL circuit (4
Since it is obtained by dividing the frequency corresponding to the frequency of the horizontal synchronizing signal in the reproduced signal from 7) by the frequency dividing circuit (48 ₁ ) to (48 ₄ ), the recording pilot signal When there is a frequency deviation within the tolerance or when there is a change in the relative speed of the rotary head due to a tape speed change during variable speed reproduction, the reference pilot signal also includes the deviation. Therefore, the difference between the frequency differences Δf _A and Δf _B obtained from the multiplication circuit (22) becomes small, and a good tracking error can be obtained even during variable speed reproduction through the bandpass filters (25) and (26). Is. However, in this case, the band widths of the band pass filters (25) and (26) are made slightly wider than in the case of supporting only the normal reproduction.

D The problem to be solved by the present invention is that the tracking control device as shown in FIG. 6 has a complicated circuit configuration, and requires, for example, many frequency dividers and a switch circuit for switching the frequency dividers. It has been demanded to deal with the change in tape speed with a simple structure.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a tracking control device having a simple configuration capable of coping with a deviation of a reproduction pilot frequency due to a change in tape speed or the like.

E Means for Solving the Problems In the tracking control device of the present invention, as shown in FIG. 1, for example, an information signal is recorded as a diagonal track on a tape by a rotary head and frequency separation from the information signal is possible. A plurality of pilot signals with different frequencies depending on the rotary head in each state
When reproducing from a recording medium in which pilot signals of three frequencies are allocated and recorded cyclically, the reproduction pilot signal separated from the output of the reproducing rotary head is multiplied by the reference pilot signal, and the multiplication calculation power is calculated. In a tracking control device for obtaining a tracking error signal of a reproducing rotary head based on this, a filter for detecting a tracking error signal is composed of switched capacitor filters (57) and (58), and the switched capacitor filter (57 ) And (58), the center frequency is changed according to the running speed of the tape.

F Action The tracking control device of the present invention is adapted to change the center frequency of the switched capacitor filters (57) and (58) according to the running speed of the tape, thereby responding to the change of the reproduction pilot frequency during variable speed reproduction. Then filter (5
The center frequencies of 7) and (58) change, and tracking error detection based on the playback pilot signal can always be performed well regardless of the tape speed.

G Embodiment Hereinafter, one embodiment of the tracking control device of the present invention will be described.
Description will be made with reference to FIGS. 1 to 2, parts corresponding to those in FIGS. 3 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

Structure of G ₁ tracking controller In Fig. 1, (51) is the RF reproduced from the magnetic head.
This shows the playback RF signal input terminal to which the signal is supplied.
The signal obtained at the RF signal input terminal (51) is supplied to the bandpass filter (52). This Band Pass Filter (52)
Is a filter that passes the band in which the pilot signal exists, and supplies the output signal of the bandpass filter (52) to the voltage control amplifier (54) via the preamplifier (53).
The voltage control amplifier (54) is controlled by the output signal of the first sample hold circuit (71) described later, and supplies the output signal of the voltage control amplifier (54) to one multiplication input of the multiplication circuit (55).

On the other hand, a pilot signal generation circuit (23) is provided, from which reference pilot signals P ₁ , P ₂ , P of frequencies f ₁ , f ₂ , f ₃ , f ₄ are provided.
₃ and P ₄ are obtained, and these are supplied to the switch circuit (24).

Select signals from the switch control circuit (20) are supplied to the switch circuit (24), and one of pilot signals of four types of frequencies is extracted from the switch circuit (24) at a predetermined cycle by these select signals. The pilot signal is supplied as a reference pilot signal to the other multiplication input of the multiplication circuit (55) and is also supplied as a recording pilot signal to the recording pilot signal output terminal (56). Then, the multiplication circuit (55) supplies the multiplication signal of the signals obtained at the one and the other multiplication inputs to the first and second switched capacitor filters (57) and (58). The first and second switched capacitor filters (57) and (58) are so-called band-pass filters that limit the pass band of the multiplication signal to be supplied, and have a circuit configuration as shown in FIG. It is integrated into an IC, and the center frequency of the pass band changes depending on the supplied control signal. That is, the horizontal synchronizing signal of the reproduced signal obtained at the reproducing horizontal synchronizing signal input terminal (59) is supplied to the PLL circuit (60) and the frequency (hereinafter referred to as f _H ) corresponding to one horizontal period of this horizontal synchronizing signal is supplied. A frequency signal of a predetermined multiple is used, and this frequency signal is divided by a 1 / L divider (6
The frequency signal output from the frequency divider (61) is supplied as a control signal to the first and second switched capacitor filters (57) and (58). By doing so, when the interval of the horizontal synchronizing signal reproduced due to the change of the tape speed changes, the first and second switched capacitor filters (57) and The frequency of the control signal supplied to (58) changes. Then, each of the switched capacitor filters (57), 57
The center frequency of the pass band of (58) changes. The center frequency of the first switched capacitor filter (57) when the control signal is supplied when the tape speed is the normal speed is f _H
Similarly, the center frequency of the second switched capacitor filter (58) at the normal speed is 3f _H.

The output signal of the first switched capacitor filter (57) thus formed is supplied to the count signal output terminal (62), one fixed contact (63a) of the first changeover switch (63) and the second changeover switch. (64) and one fixed contact (64a). Then, the tape running amount can be counted by detecting a change in the signal obtained at the count signal output terminal (62). Further, the output signal of the second switched capacitor filter (58) is supplied to the other fixed contact (63b) of the first changeover switch (63) and the other fixed contact (64b) of the second changeover switch (64). Supply to. The changeover of the first and second changeover switches (63) and (64) is
Head switching signal RFSW obtained at terminal (65) (Fig. 5A)
The changeover switches (63) and (64) are interlocked with each other during switching of the scanning period of the head, and the movable contact (63c) of the first changeover switch (63) is one fixed contact, for example. When connected to the (63a) side, the second
The movable contact (64c) of the changeover switch (64) is connected to the other fixed contact (64b) side. Then, each movable contact (6
The signals obtained in 3c) and (64c) are supplied to envelope detectors (66) and (67), respectively, and envelope detection is performed. The detection signals of the respective detectors (67) and (68) are supplied to a subtraction circuit (69), and the subtraction output signals of both are passed through a low pass filter (70) to a first and second sample hold circuit (71). ) And (72). The first sample-hold circuit (71) controls the sampling timing by the timing signal obtained at the terminal (71a), and outputs the sample-held output signal to the Schmitt circuit (73).
And a voltage control signal to the above voltage control amplifier (54) via a resistor (74). And
The output signal of the Schmitt circuit (73) is supplied to the back lock detection terminal (75). By doing so, a signal indicating whether or not the tracking is in the back lock state can be obtained at the back lock detection terminal (75).

The second sample and hold circuit (72) is connected to the terminal (72
The timing of sampling is controlled by the timing signal obtained in a), the sampled and held output signal is supplied to the subtraction circuit (78) through the resistor (76), and the reference power supply (79) is further supplied to the subtraction circuit (79). 78), and the subtraction output signals of both are supplied to the ATF error signal output terminal (80). The inverting input terminal and the output terminal of the subtraction circuit (78) are connected via a resistor (77). By doing so, an ATF error signal is obtained at the ATF error signal output terminal (80), and tracking control is performed by this ATF error signal.

Operation of G ₂ Tracking Control Device The tracking control device of the present example is configured as described above, so that when the tape speed changes due to variable speed reproduction or the like, the first and second switched capacitor filters (57) and ( Since the center frequency of 58) changes, even if the pass bands of the filters (57) and (58) are made extremely narrow, it is possible to respond to changes in the beat frequency due to changes in tape speed, and good tracking is maintained regardless of tape speed. An error signal is obtained. Therefore, good tracking control can be performed even during variable speed reproduction. Further, for example, the count based on the signal obtained at the count signal output terminal (62) can accurately count the tape running amount even during variable speed reproduction.
The center frequencies of the filters (57) and (58) are changed by about 10% when the tape speed is changed by 10%.

G ₃ Switched Capacitor Filter Circuit Example Note that the first and second switched capacitor filters (57) and (58) shown in FIG. 1 use IC filters, and the circuit of this IC filter is For example, it is configured as shown in FIG. The filter shown in FIG. 2 shows a first switched capacitor filter (57) whose center frequency during normal reproduction is f _H , and limits the band of the signal obtained at the input terminal (57a) to the output terminal. (57b) is a biquad switched capacitor filter that is supplied to (57b) and is composed of _first and second operational amplifiers OP ₁ and OP ₂ , FETs M _{1 to} M ₁₆ and capacitors C _{10 to} C ₁₂ and C _{20 to} C _23. is there. By using the IC-type switched capacitor filter as described above, the tracking control device of FIG. 1 can be easily configured. In the case of the second switched capacitor filter (58) whose center frequency is 3f _H , the capacitor C ₂₁ of the circuit shown in FIG. 2 may be changed.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

H According to the tracking control device of the present invention, the filter for tracking error signal detection is composed of the switched capacitor filters (57) and (58), and the center of the switched capacitor filters (57) and (58). Since the frequency is changed according to the running speed of the tape, there is an advantage that a tracking control device that copes with the change in the tape speed can be obtained with a simple circuit configuration using a small number of filters.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the tracking control device of the present invention, FIG. 2 is a circuit diagram showing an example of a switched capacitor filter, and FIGS. 3 and 5 are diagrams for explaining the ATF system, respectively. 4 and 6 are block diagrams showing a conventional tracking control device. (57) is the first switched capacitor filter, (58)
Is a second switched capacitor filter, (59) is a reproduction horizontal synchronizing signal input terminal, (60) is a PLL circuit, and (61) is 1 / L.
It is a frequency divider.

Claims (1)

[Claims] 1. An information signal is recorded as a diagonal track on a tape by a rotary head, and a plurality of pilot signals having different frequencies are recorded on the track by the rotary head in a state of being frequency separated from the information signal. At the time of reproduction from a recording medium in which a pilot signal of one frequency is allocated per cycle and is cyclically recorded,
In the tracking control device, the reproduction pilot signal separated from the output of the reproducing rotary head is multiplied by the reference pilot signal, and the tracking error signal of the reproducing rotary head is obtained based on the multiplication calculation force. A tracking control device characterized in that a filter for signal detection is composed of a switched capacitor filter, and a center frequency of the switched capacitor filter is changed according to a running speed of the tape.