JPS58159258A - Tracking controller - Google Patents

Abstract

PURPOSE:To set the tracking position as required with a simple constitution, by controlling the gain of a deviation signal based on a pilot signal from adjacent tracks for the feedback control of the tracking of a reproducing head. CONSTITUTION:The pilot signal of both adjacent tracks detected at a pilot signal detection circuit 13 are separated at frequency detection circuits and inverting circuits 20 and 22, 21 and 23, and attain to corresponding DC deviation signals. The tracking of the reproducing head is controlled for feedback so that the difference between both deviation signals via a subtractor 24 goes to zero. In switching a switch 32 or 33 of a gain control circuit 31, the gain of the DC deviation signal is controlled at coefficient circuits 34, 35 into a multiple (n) and the tracking position of the reproducing head is changed. Thus, through a simple constitution, the tracking position is set as required for the measurement of crosstalk.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tracking control device, in which a pilot signal recorded on a recording medium is reproduced by a reproducing head, and a detected pilot signal is reproduced by a reproducing head. Automatic track following method (A) that tracks the playback head to the raw track based on the signal.
TF method).

Conventionally, for example, AT is one method for performing phase servo of the capstan system of a video tape recorder (VTR).
This method detects the relative phase relationship between the pilot signal recorded continuously or intermittently on the information recording track of the tape as a recording medium and the playback head, and detects the error. The speed of the capstan and therefore the running speed of the tape are changed to compensate for this.It is relatively easy to correctly track and lock the playback head to each track, but if the playback head is deviated from each track, the racking lock (t&c) It was difficult for a strongman to do so.

However, in general, in VT)L, it is necessary to align the playback head to the desired track during dubbing, or to
When measuring the amount of crosstalk with respect to the tracking deviation IIK in the case of IIK, it may be necessary to arbitrarily lock the playback head at a position offset from each track, and from this point of view, the conventional ATF method The equipment was still functionally inadequate.

A second method that can alleviate this problem is the so-called control signal method (CTL method). In this method, a timing pulse signal is recorded as a control signal along the running direction of the tape, and this control i41 signal is played back by a dedicated control signal playback head, and the phase of this playback control signal and a separately oscillated reference are used. The speed of the capstan is controlled to eliminate the difference in phase of the pulse. In this method, the phase of the reference pulse can be controlled by a controllable element called a tracking control volume, and thus the tracking lock point can be easily shifted.

However, in the case of this CTL method, K11llllll on the tape
A dedicated track for recording the 1 signal and a fixed head for reliably reproducing the 1It11 signal from this trunk must be prepared separately from the recording and playback of video notes, and in this respect it is different from the case of the ATF method. In comparison, there is a problem that the structure around the tape becomes sloppy.

In consideration of the above points, the present invention proposes a tracking control number that allows the tracking lock point to be easily shifted in the ATF method.

An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment in which a pilot signal is continuously recorded twice on an information recording track. Based on the following ATF
It has the basic configuration shown in FIG. 2 for operation. That is, on the tape (11), as shown in the third @, there are a plurality of, for example, four types of baylot signals f1 + each having a different frequency.
◆ Video tracks TI, T2, T3 on which f2 s f3 t 14 are recorded.

'The group 4 repeats the 11th section cyclically, touching the 5 diagonally.The effective width of the video head, which is the playback head (12), is determined by the vibration of the multiple tracks. For example, the width of the tracks T1 to T'r4 is selected to be an indeterminate value, and from this track the playback head (12) is currently scanning for playback (this is called a playback track).
By reproducing only the pilot signal recorded on the track when tracking correctly, the pilot frequency component included in the playback output will be in the 1 to 11 class. When the head (12) is shifted to the right or left, the pilot 8 wave number component included in the reproduced output is also reproduced by reproducing the pilot signal recorded on the track that is swayed to the right or left axis of the relevant reproduction track. is set to 2Wi-.

However, the frequencies 1 and 4 of pilot signals 11 to f4 of the four woodcutter types
f1~f4 are low frequencies (600~'yOo(k)(Z
11 of the color components converted to l)? Among the four tracks T1 to T4 selected in the I area and circulating, for example, the odd numbered track TI, T3 is the center Kl, 'C, and the jli number difference with the pilot signal of the right track is Af□ E
Then, the pilot signal of the truck and the surroundings
a difference is At8, and even-numbered tracks T2. Centering on T4, the frequency difference with the pilot signal of the right truck is At, and the frequency difference with the pilot signal of the left truck is Δf.
, it has been made 5.

Let's assume that the head (12) is the odd 11th track TI.
.

′l゛3, if the frequency component of the pilot signal included in the reproduced signal has a frequency jf□, it can be seen that the head (12) is shifted to the right by 11iK, and the frequency Δtransport is If there is a signal, it is known that the head (12) is in a left-shifted state, and furthermore, the eight wave numbers Δi and Δ
If there is no change, you can see that the tracking is correct.

- For Mr. J, the head (12) is an even numbered track T2
．． When T4 is being regenerated, if there is a signal with a frequency of -Δx as a frequency component of the pilot signal included in the regenerated signal, it is known that the head (12) is shifted to the right.
Further, if there is a signal of frequency fA, it can be seen that the head (12) is in the left-shifted position.

This implementation? In the case of 1. Second. Third. m111 for the fourth track TI, T2, T3, T4
The applied frequency f , f , f , f is f
, = 1011 34 (kHz), f2 = 116 [kHX), f, -16O(
kHz).

La = 146 (kHz" IK selected and followed? Jffl
The wave number difference Δf and jf are as follows: ΔrA-1'1'21=l's'41=14
[kHz)・・・・・・・・・(1) Δfi+=l fz fs l=l 's '41
=44 (kHl) (2) is selected.

A reproduced signal 81 having such content obtained from the head (12) is given to a pilot signal detection circuit (13) having a low-pass filter configuration, and pilot signals f1 to f4 included in the reproduced signal S1 are extracted. The detected pilot signal S2 is applied to the multiplier (14) as a first multiplication input. The reference pilot signal 811 of the rotor point 1llt control path (15) is applied to the multiplier (14) as a second multiplication input.

The lock point control U path (15) is 481 at frequencies f1 to f4.
A pilot frequency generating circuit (16) that generates pilot frequency #jL number outputs f1 to f4 of the type, and a rotating drum (not shown) K are connected to each other when the head that scans the tape among the two video heads is switched. and a switch circuit (17) which receives a head switching pulse RF-8W (FIG. 4A) which changes the logic level to E. In this embodiment, switch II (17) is the head switching pulse ELF -8W.
It has a quaternary counter circuit that counts every time the level of
The gate signals corresponding to the fourth tracks T1 to 'I'4K can be sequentially repeated, and the tracks TI-T
The gates are opened by the gate signals of 4 and the Byron wave number outputs f8 to f4 of the pilot frequency generating circuit (16) are sequentially sent out as reference pilot signals Sll, as shown in FIG. 4B.

The pilot frequency outputs f1 to f4 obtained at the output end of this switch circuit (17) are connected to the signal line (1) during recording.
8) to the video head as a pilot signal, and thus the video head is sent to the first to fourth tracks T.
The corresponding JiIlltIl while scanning I-T4
Several pilot signals f1 to f4 are sequentially applied to the video head to record on each track T1 to T4.

In this way, the head (12) scans the tracks 1 to 411th tracks '1'l - r4k, respectively, and the detected pilot signal 82 is obtained at the output end of the pilot signal detection circuit (13). Multiply the #terupilot signal'@811 that occurs in synchronization with the #illustration track.
Therefore, when there is a tracking error, the ridge component included in the detected pilot signal S2 and the reference pilot flaw'
w18114F) Obtain a multiplication output 812 that includes a frequency component with a frequency difference from the sum wave number (actually, the multiplication output SL2 also includes other signal components such as the sum frequency component). 812 are given to the first and 1A20 differences N@wavenumber detection circles formed by #II bandpass filters (addition) and (mu), respectively. The first difference 8 wave number detection circuit (2o) extracts this when the multiplication output 812 also contains the signal component of (112) <JlldtIM, number difference Δf, A direct current converting circuit (22) having a circuit configuration converts the signal into direct current to obtain a first error detection signal 813 at a direct current level.Similarly, the second difference frequency detecting circuit (21) converts the multiplication output 812 into direct current. ) If a signal component of the frequency difference coefficient based on the equation is included, it is extracted and an error detection signal 814 of aI2 is obtained from the DC converting circuit (mu).

Here, the head (12) is the first. Second. Third. If the fourth trunk TI, T2, T3, T4 is shifted to the right while scanning, the reproduction output 81 of the head (12)
The detected pilot signal 82 K obtained based on the frequency #! as shown in FIG. 4 CI. L11 and f, , f, and f,
, f, and f, , f4, and fl, the difference frequencies Δf, (-f1 to f2), Δf, (
=f, ~f, ), jfyo(=f.

-f4), Δf, and (-f4 to f1) are generated. On the other hand, when the head (12) is shifted to the left, the detected pilot signal S2 sequentially has frequencies f, f, fl, and f2 as shown in No. 4-02K.

1 f2 and f, , f, and f4 pilot signals are included, and accordingly, the multiplication output 812 can be changed to 4 as desired.
As shown in Figure D2, the difference frequency Δf, (=f, ~f1),
ΔfA (= f1~f,) f, (2 f2~f,).

ΔfA (=f, ~f,) is sequentially included.

Thus, as shown in Fig. 4 E and FK (for example, right shift Sa
The first and second error detection signals 813 and 814, in which the DC level rises from O every time the track scanned by the head (12) changes; be able to.

The first and second error detection signals 813 and 814 are supplied to the subtraction circuit (24) as an addition input and a subtraction input, respectively, so that the first and second error detection signals 813 and 814 are input to the subtraction circuit (24).
A subtraction output 815 that changes in an alternating current manner is obtained each time the error detection signals 813 and 814 are obtained alternately. This subtraction output 815 is the first one of the direct changeover switch circuit (25).
The signal is applied to the input terminal al, and its polarity is inverted in the inverting circuit (26), and then applied to the second input terminal a2. The changeover switch circuit (25) has a head changeover pulse of 1-8WK.
Therefore, for example, the head (12) is on the odd ai 1st track T.
When scanning I, T3°, the switching operation is performed to the first input trend 11@, and in contrast, even-numbered tractors T2. T4
When the head (12) is being scanned, the switch is made to the second input terminal 2, and as shown in FIG. In this state, the DC level output 816 becomes negative polarity), and this is sent out as an error signal 817 via the DC amplifier (27). Incidentally, if the head (12) is shifted to the right, for example, the reproduced tracks will be odd-numbered Tl, T.
3, a signal component of 1tdIIL number difference 4f appears at the output terminal of the multiplication circuit (14), so that the output from the first difference frequency detection circuit (20) side is given to the subtraction circuit (24), and At this time, the changeover switch circuit (25) is switched to the first input terminal al side, so it sends out an error signal 817 at a positive DC level. On the other hand, the playback track is the even numbered track T2. When T4, multiplication - path (14)
Since a signal component of the frequency difference Δf appears at the output terminal of Since the input steel weight of 2 has been changed to 2, the negative output of subtraction jl (24) is reversed M (addition)
The polarity is inverted and sent as an error signal 817 at a positive DC level.

Therefore, if this error signal 817 is used as a correction signal in the phase servo circuit of a cabstan servo system, and the tape running speed is corrected to be faster when it is positive and slowed down when it is negative, it is possible to correct It is possible to correct the phase shift, thus realizing correct tracking servo.

The tracking control device shown in FIG. 1 has the following configuration in addition to the basic configuration shown in FIGS. 2 and 3.

1K, in the case of FIG.
The left and right side lII connecting trunks T4 and T2.TI and T3.T2 and T4.T3 and T1 have a length that extends to T3 and T1, thereby playing back to the six raw outputs 81 of the playback head (12). The pilot signal obtained from the track and the pilot signals obtained from the adjacent tracks on the left and right sides are included.However, the pilot signal obtained from the 5th playback track of the playback output S1 is reproduced to all of the playback tracks. Since the heads are in contact with each other, the magnitude K is constant regardless of the amount of deviation of the stop head, whereas the magnitude of the pilot signal obtained from the adjacent tracks on the left and right sides is determined by the magnitude of the pilot signal obtained from the adjacent tracks on the left and right sides. lil[) It will be determined by the cum that is in contact with the rack. Therefore, if the reproducing head (12) is correctly tracking the reproducing track, the magnitudes of the pilot signals of the respective I11 connecting trunks will be poorer than each other. On the other hand, if the playback head (12) shifts to the right or left, the pilot signal of the rack in the direction opposite to the direction of shift corresponds to the amount of shift. It gets bigger.

Second, in the case of FIG. 1, an S gain control circuit (31) is provided between the DC conversion circuits (T2) and (T2) and the subtraction circuit (24). Gain control circuit* (31) is a changeover switch circuit (branch) having a direct terminal b1 and an n-fold terminal b2.
and (33), and directly receives the first error detection signal 813 obtained from the first DC conversion circuit (η) to the direct terminal bi of the first switching circuit ((), and also has a coefficient circuit ( 34), the gain of the error detection signal 813 is controlled by multiplying it by a coefficient n, and the signal is received at the n-fold terminal b2, and is also sent from the second direct current conversion circuit (23) to the direct terminal b1 of the changeover switch circuit (33) of WJ2. Second obtained
It directly receives the error detection signal 814 of the coefficient circuit (
35), the gain of the error detection signal 814 is controlled by multiplying it by a coefficient n so that it is received at the n-fold terminal b2. Thus, the first and second changeover switches-
Paths (32) and (33) are direct terminals b1, respectively.
When switched to @, the first and second error detection signals 8
13 and 814 '& without the gain 5rtn, add human power 821 and subtract human power S to the subtraction circuit (24)? 2, and when switched to the n-fold terminal b2, an addition input 821 and a subtraction input 822, which are obtained by multiplying the first and second error detection signals 813 and 814 by a coefficient n, are provided to the subtraction circuit (24). It is done like this.

The first and second changeover switch circuits (32) and (o) are switched by changeover control outputs 1921 and 825 generated in response to the setting signal 8Z3 in the changeover control circuit (36).

In the configuration of νSHIF, when trying to correctly track the playback head (12) to, for example, the second track T2, both the first and second changeover switch circuits (branches) and (33) are turned off by the setting signal S23. direct terminal bl
can be switched to the side. At this time, the error detection signals 813 and 814 are directly applied to the subtraction circuit (24), and a tracking error signal 817 such that the difference output 815 becomes 0 is applied to the capstan yarn servo circuit. Therefore, at this time, the playback head (12) is connected to the 1ilI contact track TI.
and pilot signals f8 of mutually equal magnitude from T3
and fst - are locked in the playing state, so that the playback head (12) tracks in the correct locked position with lengths equal to the adjacent tracks TI and T3 facing each other across the playback track T2.

From this correct tracking lock state, the playback head (1
2), if you want to lock it with a slight shift toward the right track T3, reset the setting signal 823 so that it corresponds to the trunk in the opposite direction to the direction you are trying to shift, that is, the left track T1. Switching switch circuit for supply 1
Switch to the vehicle.

At this time, the first error detection signal 813 obtained based on the difference frequency Δf□ is 0 of the second error detection signal 814.
Since the size is doubled, the difference output 81 of the subtraction circuit (24)
5 increases in the positive direction. In response, tracking error No. 16 817 cancels this change and controls the speed of the servo circuit of the capstan thread so that the differential output 815 becomes a peak.
As a result, if the playback head (12) is turned in a direction that reduces the difference frequency Δf□, it will be shifted to the right so that the length of contact with the left trunk °l"l will become smaller. When the playback head (12) is in contact with the right track 'v3 for the length IAK of the part where the Tansho head (12) is in contact with the left trunk T1, as shown in FIG. The ratio of the length l of the part that is
+ , : t n= t : n
・−・・・・・・＜3).

The signals of each portion of this right-shifted IIK are shown by solid lines in FIG. In other words, head switching notes RF
-8W (Figure 6) The reference pilot signal 811 (of the lock point control circuit (15))
@6 Figure B) is given to the multiplier (14), the first . Second. Third. 4th track TI,'r2
, T3, and T4, the playback head (12) is locked at a position with a ratio of (1:n (the case where n=2 is shown) based on (3) 2 above). As a result, when reproducing the first track T1 (when the reference pilot signal S11 is fl), the difference frequency f, (=
Difference frequency Δf between the error detection value −qs13 (FIG. 6 CI) obtained from the DC conversion circuit (22) by f□ to f4) and the pilot signal f also obtained from the right track T2.

(-ft~f2)I' Therefore, the ratio with the error detection value 4Ij814 (C2 in FIG. 6) obtained from the DC conversion path (23) is 1:n(-1:2)K. At this time, the first changeover switch jl (32) has the logic [0-j level switching i! 8′1j11! No. 824 is given (Fig. 6 1) 1), whereas the second
The changeover switch circuit (33) K is supplied with the January level changeover control 41 signal 825 as part of the n-times terminal b2 K changeover (D2 in FIG. 6). As a result, the first error detection signal SL3 is directly applied to the subtraction circuit (24) as an addition signal 821 (El in FIG. The subtraction circuit (2
4) is given. Therefore, the difference output 8 of the subtraction circuit (24)
15 (FIG. 6F) is OK, and the tracking error signal 817 (FIG. 6Q) also becomes O level and the playback head (
12) b'1: Indicates that tracking is locked at position n.'4r: Indicates that tracking is locked at position n.

When the second track T2 starts playing and the reference pilot signal vS11 becomes f, the KN raw head (12) moves to the left -〇 track T1 as described above for Figure 5.
an error detection signal 813 (FIG. 6 CI) of the difference frequency jf obtained based on the pilot signal f1 obtained from the
The error detection signal 514 (of the difference frequency jfl obtained based on the pilot signal f obtained from the right track T3)
(02) in Fig. 6 is reversed and switched to 1:n, and the first and second changeover switch circuits (32) and (3
3) switching control signals 824 and 525 given to
By also switching the logic level of (D1 and I)2) in FIG. 6, the error detection signal 813 of 1i is
), the addition output 821 is multiplied by n (-2) and becomes the second
It becomes the same level as the subtracted output 822 formed by the error detection signal 814 (E1 and E2 in FIG. 6). Therefore, [hereinafter, the same process as when generating the first track Tl ttPj] is performed [difference output 815 (FIG. 6F), tracking error signal 81
6 becomes the θ level and maintains an equilibrium state.

Thereafter, a tracking equilibrium state is obtained for each of the odd-numbered tracks and even-numbered tracks in the same manner.

If the playback head (12) deviates to the left from this rightward deviation for some reason, the addition input 821 and subtraction input S22 to the subtraction circuit K (24) will fluctuate as shown in the inspection diagram in FIG. (@E1 and E2 in Figure 6) At this time, the difference output 815 of the subtraction circuit (24) is 1+L, and (F in Figure 6)) The racking error signal 817 drops to a negative level and is sent to the capstan system servo circuit. Playhead (
12) Give water by moving it back to the right. Thus, the error detection signals 813 and 814 temporarily fluctuate, but eventually return to their actual equilibrium state.

Next, if you want to move the playback head (12) to the left side from the state where it is correctly tracking the Toyo track T2, reset the setting signal S and set the switching side lI411.
I! By the i path (36), the W, 2 changeover switch 1 path (33) corresponding to the track in the opposite direction to the direction to be shifted, that is, the right truck T3, is connected to the n times terminal b2.
111 (first changeover switch 4-way (32
) is switched to the direct terminal bl @). In this way, the playback head (12) can be shifted to the left in the same way as the above-mentioned shift to the right, and in the balanced state, the length of the portion where the playback head (12) is in contact with the left track T1 is S.l.

The length of the portion where the playback head (12) is in contact with the right track T3 is 1. The ratio of l A : l B-n : 1
・−・・・＝・(') becomes.

5. According to the configuration shown in FIG. 1, the reproducing head (12)
Coefficient circuit (34) and (
Does the ratio of the coefficient value set in 35) follow? lt No. 813 and 8
The playback head (12
) can be easily torn to the left or even to the right.

In the above description, the case where the pilot signal was recorded continuously on the information 1 recording track was described, but the present invention is applicable to the case where the pilot signal is recorded intermittently.
Similarly, the reproducing head can be shifted as necessary.

This intermittent recording type λTF racking control device basically has the configuration shown in FIG. In FIG. 7, the pilot signal component of the six raw outputs Sl of the reproducing head (12) is extracted in a pilot signal detection circuit (4I) having, for example, a pneumatic path filter configuration, and is applied to an adjacent track pilot signal detection circuit (42)K.

In this case, the tape as a recording medium is used as shown in Figure 8.
For example, an interval of 125[deg.
A pilot signal (43) of kHz is intermittently recorded. However, the odd numbered rack AI, A2
, M3..., 0-phase pilot signals (43) are recorded at 2H intervals, and the recording positions of the pilot signals (43) of each track are sequentially shifted by H intervals. ing.

On the other hand, odd-numbered tracks AI, A2. A3...
even-numbered tracks Bl arranged on the right side of
B2. In B3..., 0-phase and π-phase pilot signals (43) of the opposite phase are recorded alternately at 2H intervals, and the recording position is at the left track input 1. A2.
A3 . . . are arranged to coincide with the recording position of the pilot signal (0).

In this case as well, the reproducing head (12) has a width of 5 so that it straddles the KM raw track TO and faces the left and right tracks TL and TR, as shown in FIG. While reproducing the recorded pilot signal (43), the left and right II! ) The pilot signal detection circuit (41
) (FIG. 7) is applied to the input switch path (44) of the adjacent track pilot signal detection signal (42).

The human switch circuit (44) is a pilot signal detection circuit (
41) is received at the direct input terminal x1 and also at the inverting input terminal x2 via the inverting circuit (45), and the head switching signal RF -
The switching 11111141 is performed by a switching signal 852K applied through a two-man NAND gate circuit (46) which receives 8W as one input signal. Head switching signal F
As shown in Table 1, when -15W is at the logic 104 level, the detected pilot signal 851 is directly input to the comb-tooth filter ( 47), and on the other hand, when it is at the -11+1J level, the input signal 853 of the other power of the Nantes gate circuit (46) becomes the first [l-level], and the input switch 1 path (44) is inverted. When the terminal is switched to the terminal x2, the input signal S51 detected by the terminal K is inverted by an inverting circuit (45) and applied to the sea filter (47).

No. Ill comb tooth filter (47) is a manual switch circuit (・14
) and a 2H*ground circuit (48) that delays the detected pilot signal 852 obtained from the 2-day delay circuit (48) by 2 flea, and receives the output of this 2-day delay circuit (48) as a subtraction input 858, and also receives the detected pilot signal 852 of the input switch circuit (44). It has a subtraction circuit (49) which receives the signal 852 as an addition input 859, and the difference output S60 is a low-pass filter configured as k.
The K conversion circuit (50) converts it to a DC level, and the peak hold circuit (51) holds it at K.

Adjacent track-by-lot signal detection times M with such a configuration
(42) operates as follows. The second human input signal 553 (FIG. 9B) of the NAND circuit (46) is the vertical synchronization frequency 'i
The synchronizing signal 562 (Fig. 9A) of
52) is formed by frequency division at 2H1lt
As shown in FIG. 9C, there is a period Wl in which the head switching pulse RF-8W is at logic [0] level (odd-numbered track entry 1).

A! , A3...), as is clear from Table 1, the Nant gate circuit (46
) sends out a switching control signal 552 (FIG. 9D) for switching the input switch circuit (44) to the terminal x1.

At this time, from the pilot signal output circuit 'NI (41) to the 9th
The pilot color component PI continues to have 0 components as shown in Figure E. ) or a pilot signal component P2 (reproduction head (1
2) are even-numbered heads Bl, B2. B3...
If the detected pilot signal S68 is distorted, it is directly applied to the subtraction circuit (49) as an addition input 859.

On the other hand, the detected pilot signal 862 is transmitted through a 2H*jL circuit (48
) and is given to the subtraction circuit (49) as a subtraction power 558 (FIG. 9F), so the subtraction (b) path (49)
As shown in FIG. 9G, the difference output 860 is that for the pilot signal component P1 that continues with the 0 component, these mutually cancel each other (・K) and are not output (this is indicated by the X mark p), and the 0 phase and π
Regarding the pilot signal component P2 whose phase components are alternately switched, these are added together and output (this is 2.0,
(expressed as 2・π).

In contrast, head switching pulse)tF-SW
l” section that rose to the level (even-numbered track Bl,
B2. As is clear from Table 1, when the 1/4 minute circuit (corresponds to the scanning section of B3...)
The Nant gate circuit (46) sends out a switching control signal 852 that switches the input switch circuit (44) to terminal x2 when the output 853 of 2) is logic II 1-OJ, and switches it to terminal x1 when the output 853 is logic 1-1. . Therefore, the input switch circuit (
44) is the phase of the incoming detected pilot signal 8510
In this way, as shown in FIG. 9 RK, when the O-phase component continues continuously in the pilot signal component P1, an adding force 859 is formed which alternately switches the phase component to 0 phase or 0 phase. The pilot signal component P2 in which the 0-phase or π-phase components are alternately replaced is continuously followed by the π-phase or 0 component (forming an addition input 859. However, the subtraction circuit 09 has this addition input 859). is delayed by 2H and given as subtracted human power 858, so the difference output 860
As shown in Figure 9 (l), for the pilot signal component P1 where the O-phase component continues, the addition output (2・0, 2-f) is output, whereas the O-phase or π-phase components are alternately switched. For the pilot signal component P2 K, the wax becomes O.

Thus, the adjacent track pilot signal detection circuit (42)
The playback head (12) is the odd-numbered track AI.

A2. 0 alternately when playing A3...
intermittently generates pilot signals for adjacent tracks (even-numbered) on the left and right sides in which the phase or π-phase components are reproduced;
Also, the playback head (12) is on even-numbered tracks Bl, B.
2. When playing B3..., O continuously.
Pilot signals are intermittently generated for adjacent tracks (odd numbered) on the left and right sides from which the phase components are reproduced. However, the amplitude of this intermittent pilot signal is
2) corresponds to the length of the portion of the ILI image that is in contact with the top track, and therefore the amount of deviation of the reproducing head (12) from the reproducing track, and this is held in the peak hold circuit (51). In this embodiment, it is assumed that the peak hold circuit (51) is configured to update the hold value every 2H1'&&1.

In this way, the hold value held at the peak hold circuit (50) is transferred to the first and second sample hold circuits (61
) and (6) Sample pulse generation'##((B) Sample and hold is performed by sample pulses 865 and 866 alternately generated. Sample pulse generator (
The hook is connected to the left rack based on the H-interval synchronization pulse 867 that is synchronized with the pilot signal reproduced from the reproduction head (12).The hold value corresponding to the pilot signal of the left rack is held in the peak hold circuit (51). When the first sample pulse 865 is generated, the sample hold value is sampled and held in the sample hold circuit (61), and the hold value corresponding to the pilot signal of the adjacent track on the right is sampled and held in the peak hold circuit. (
51), a second sample pulse 866 is generated and the hold value is sampled and held in the 20th pull-hold circuit (62).

The outputs of the first and second sample hold circuits (61) and (6) are compared in a comparison circuit (64),
The difference output 868 is sent out as a signal 869 similar to the tracking error signal 817 described above with respect to FIG. However, the first and second sample and hold circuits (61) and (
The number hold values of 6 correspond to the extent to which the playback head (12) is in contact with the adjacent tracks on the right and left sides of the playback track, respectively, so the tracking error signal 86& is the difference between them and the playback track. This indicates the amount of deviation of the capstan system, thus controlling the water circuit of the capstan system.
Tracking control can be performed more reliably than K.

In this embodiment with such a basic configuration, as shown in the gio diagram corresponding to FIG.
The tracking lock position is determined by outputting the tracking lock position to the comparator circuit ((2) via the second changeover switch (b) path (branch) and (33), and the gain of the error signal is determined by the coefficient circuits (34) and (35). By controlling it, it can be set as necessary.

In the above, the production speed of the tape is controlled so that the tracking error becomes O by applying a tracking error signal to the capstan system servo circuit. The same effect as in the above case can be obtained even if it is applied to a drum system's nervous circuit.

Further, in the above-described embodiments, the present invention is applied to a VTR, but the present invention is not limited to this and can be widely applied to the case where a reproducing head is tracked to an information distribution track formed on a recording medium.

Furthermore, in the above-mentioned case, the changeover switch circuit (support) and (
33) Although the error signal is input directly to one terminal b1 of (FIGS. 1 and 7), a coefficient circuit may also be provided to this terminal bl.

Furthermore, in the above description, the changeover switch circuit (32) and (
The coefficient circuit provided for 33) has a fixed coefficient, but instead of this, it may be possible to set it to an arbitrary value.

As described above, according to the present invention, it is possible to easily set the tracking position as required with K for ATF type tracking control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a tracking control device according to the present invention, FIG. 2 is a connection diagram showing its basic configuration, FIG. 3 is a route map showing recording turns of an information recording track, and FIG. 4 are signal waveform diagrams showing the signals of each part in Figure 2, and Figure 5.
The figure is a route map showing the arrangement of information recording tracks (turns) used in the embodiment of FIG. 1, @6 is a signal waveform diagram showing signals at each part of FIG. A block diagram showing the basic configuration of another embodiment of the tracking side device. Fig. 8 is a schematic diagram showing the recording pattern of the information recording track used in the embodiment of Fig. 7, and Fig. 9 is a diagram showing the recording pattern of the information recording track used in the embodiment of Fig. 7. Fig. 10 is a block diagram showing an embodiment of the present invention. (11)... tape, (12)... playback head, (
13)...Nokuirot signal detection circuit, (14)...
・Multiplier, (15)...Lock point control circuit, (10)
・−・Pilot wave number 5h raw w circuit, (17)...
Switch circuit, (2[J), (2])...difference frequency detection circuit, <22'), (Zll=llization circuit,
(24)... Subtraction circuit, (25)... Changeover switch circuit, (26)... Inversion circuit, (31)... Gain control circuit, (support), (33)... Changeover switch circuit. (34), (35)... related circuit, (36)...
・Switching control circuit, (41)... Pilot signal detection circuit, (42)... Adjacent traffic pilot signal detection circuit, (43)... Noku pilot signal, (44)...
Input switch circuit, (45)...inversion circuit, (47)
... Comb filter, (48) ... 2-day delay circuit, (4'l) ... Subtraction circuit, (50) - W K conversion circuit,
(51)--Peak hold circuit, (5ka--1/
4 divided by 1 path, (61). (6 lines...sample hold circuit, (6 lines...sample l) pulse generator, (6 lines...changeover switch circuit,
(66)...Inversion circuit. Condolence 4 Figure I Go o-1---□'--
Condolence 6 figure

Claims (1)

[Claims] A pilot signal is recorded on information recording tracks sequentially formed on a recording medium, and this pilot signal is reproduced by a reproducing head, and based on the detected pilot signal, the raw head is output from the Kyou trunk in mutually opposite directions. In a tracking control device that obtains a pair of deviation signals representing the deviation amount of the pair of deviation signals and forms a tracking error signal corresponding to the deviation of the pair of deviation signals, This tracking control device is similar in that it is possible to change the setting of the tracking lock point by providing a side 141 circuit.