JP2576097B2 - Tracking control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking control apparatus, and more particularly, to a digital signal recording / reproducing apparatus in which a recording track is formed obliquely on a tape by a rotating head. It is something.

SUMMARY OF THE INVENTION The present invention relates to a tracking control device for controlling the rotation of a rotating head on a recording track formed obliquely on a tape by controlling the locking phase of the rotating head so that the rotating head is positioned at the center of the recording track. By controlling the tracking to a position where the phase is locked to the phase, the rotating head can be reliably tracked to the recording track on the magnetic tape.

C. Prior Art As a digital signal recording / reproducing apparatus of this kind, a video tape recorder (VTR) is used which records a digital video signal and an audio signal obliquely on a magnetic tape using a rotating head.

D Problems to be Solved by the Invention In this kind of VTR, in an editing mode (for example, insert editing, assembly editing, etc.) in which a new signal is recorded on a tape on which a digital video signal or an audio signal is already recorded, There is a possibility that continuity may be disrupted at the joint position between the already recorded track and the newly recorded track, and when playing back a tape edited in such a state where the continuity is disrupted, the rotating head is placed on the recording track. At the time of landing, it is necessary to track the rotating head to the recording track sufficiently following the disturbance of continuity at the seam.

The position of the recording track on the tape is two-dimensionally determined using a reference position on the tape, for example, a distance in the longitudinal direction from a synchronization control signal (a so-called CTL signal) and a distance from an edge in the width direction of the tape. In this case, if the edge of the tape is deformed due to fatigue, the accuracy of the distance in the width direction cannot be increased, so that it is practically sufficient. There is a possibility that the rotating head cannot be landed on the recording track in a tracking state.

This is especially true for high-density recording of information on tape, such as in digital VTRs.
If the track pitch is reduced, it becomes an important issue that cannot be avoided.

The present invention has been made in view of the above points, and when a tape having an obliquely formed recording track is reproduced by a rotating head, when the rotating head lands on the tape, the rotation with respect to the recording track is performed. An object of the present invention is to propose a tracking control device capable of reliably performing tracking control of a rotating head on a recording track in accordance with a head locking phase.

E. Means for Solving the Problem In order to solve such a problem, according to the present invention, the recording head TR formed on the tape 4 is provided with the rotating heads 3A and 3B.
In the information recording / reproducing apparatus in which the information recorded in the recording track TR is picked up by controlling the recording head TR, when the rotating heads 3A and 3B are landed on the recording track TR, the rotating head 3 of the tape 4 is used.
By controlling the lock phase Δφ for A and 3B,
After a first phase lock state in which the rotating heads 3A and 3B are phase-locked to one side edge of the recording track TR, a second phase in which the rotating heads 3A and 3B are phase-locked to the other side edge of the recording track TR. After rotating the rotary heads 3A and 3B by a predetermined phase amount in the direction in which the locking state can be obtained, the rotary heads 3A and 3B are brought into the second phase locking state, and then the first locking in the first phase locking state. Phase Δφ ₁ and second lock phase Δφ in second phase lock state
Rotation heads 3A, 3B at center lock phase Δφ ₃ between _two
Is phase locked.

Further, in the second invention, the information recorded on the recording track TR is picked up by controlling the tracking of the rotating heads 3A and 3B on the recording track TR formed on the tape 4. In the apparatus, when the rotating heads 3A and 3B are landed on the recording track TR, the rotation phase of the tape 4 with respect to the rotating heads 3A and 3B is controlled, so that the rotating heads 3A and 3B are mislanded between the recording tracks TR. In this case, the lock phase for the rotary heads 3A and 3B is changed in the first direction, and then the rotary heads 3A and 3B are connected to one of the recording tracks TR even if the lock phase is continuously changed in the first direction by a predetermined amount. When the phase lock does not occur on the side edge of the head, the direction of change of the lock phase with respect to the rotary heads 3A and 3B is reversed in the second direction, and once returned to the initial state, Rotary head 3A after,
After changing the lock phase to 3B in the second direction, the rotary heads 3A and 3B are brought into a first phase lock state in which the rotary heads 3A and 3B are phase-locked to one side edge of the recording track TR.
Rotating heads 3A, the second phase lock state to phase lock the 3B on the other side edge of the recording track TR, the then the first lock phase [Delta] [phi ₁ and a second phase lock state in the first phase lock state rotating heads 3A in the central locking phase [Delta] [phi ₃ between the second locking phase [Delta] [phi _2, 3B and so as to phase lock.

F acting rotary heads 3A, Yotsute to control the lock phase [Delta] [phi recording track TR for 3B, recording track to detect the lock phase [Delta] [phi ₁ and [Delta] [phi ₂ representing the side edges position of TR, the center phase [Delta] [phi _{3 (=} Δφ ₁ + Δφ ₂ ) / 2) is obtained.

This central phase [Delta] [phi _3, rotary heads 3A, if 3B the tracking control, rotary heads 3A, 3B becomes possible to Jiyasu Toto Raţ King in the center position of the recording track TR, thus if rotated head 3A, 3B recording track Regardless of whether landing on TR is possible (that is, when tracking is performed), or when landing is not in the tracking state, the rotating heads 3A and 3B are reliably recorded on the track. Just tracking control can be performed on TR.

Thus, in the first invention, the rotating head 3
The lock phases of A and 3B are changed from the first lock phase Δφ ₁ to the second
Rotating heads 3A, 3B while moving in the locking phase [Delta] [phi ₂
Is jumped by a predetermined phase amount, so that the tracking control time from when the rotary heads 3A and 3B land on the tape 4 to when the rotating heads 3A and 3B enter the just tracking state can be shortened.

Further, in the second invention, even if the lock phases of the rotary heads 3A and 3B are continuously changed by a predetermined position amount, when the phase lock state is not reached, the direction of change of the lock phase is reversed to search for the phase lock state. By doing so, when the rotating heads 3A and 3B mislanded in the area between the recording tracks TR, the rotating heads 3A and 3B can be phase-locked to the closest side edge of both sides of the recording track TR,
As a result, the tracking control time from when the rotating heads 3A and 3B land on the tape 4 until the rotating heads 3A and 3B enter the just tracking state can be shortened.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(G1) Overall Configuration In FIG. 1, reference numeral 1 denotes a scanner, which scans a magnetic tape in an oblique direction by rotating heads 3A and 3B mounted on a rotating drum 2 to store digital data D _RW on a recording track TR. recorded, or is adapted to reproduce the digital data D _RW that has been recorded on the recording track TR.

The scanner 1 is rotationally driven by a separate speed servo system (not shown) in synchronization with an external reference synchronization signal REF.

The running speed of the magnetic tape 4 is set to a speed corresponding to the rotation speed by the capstan 5, and the capstan motor 7 is driven by the drive output MDA supplied from the capstan servo circuit 6 to the capstan motor 7. By controlling the rotational phase of the tape 4, the lock phase of the tape 4 with respect to the rotational heads 3A and 3B is controlled.

When the scanner 1 is operating in the recording operation mode, as shown in FIG. 2, a large number of recording tracks TR adjacent to each other in the longitudinal direction are recorded on the magnetic tape 4,
The synchronization signal CTL is recorded in the longitudinal direction of the magnetic tape 4 along the recording track TR.

The synchronizing signal CTL, when Sukiyana 1 is operating in a reproducing operation mode, the detected phase signal P _CTL via an amplifier circuit 12 which is Yotsute pickup to the synchronization signal head 11 of the fixed
To the phase comparison circuit 13.

To the phase comparator 13, a reference phase signal P _REF, the external reference synchronization signal REF is supplied via a controllable delay circuit 14, a phase comparator circuit 13 the phase difference detected phase signal P _CTL and the reference phase signal P _REF a corresponding phase error signal P _ER, rotary head 3A, the lock phase signal LOCK indicating a locking phase for the recording track TR of 3B sent to. The phase error signal _PER is converted to a direct current in the low-pass filter circuit 15 and then supplied to the drive circuit 16. The drive circuit 16 sends a drive output MDA for controlling the rotation phase of the capstan motor 7 in a direction in which the phase error signal _PER becomes zero.

Here, the delay phase amount of the controllable delay circuit 14 is determined by a phase control signal P _CON to a predetermined preset phase amount φ ₀ (for correcting a positional deviation between the synchronization signal head 11 and the rotation heads 3A and 3B). (Representing the phase) and the clock phase Δφ (representing the relative phase of the rotating heads 3A and 3B with respect to the recording track TR).

Thus the magnetic tape 4 is in a state in which phases are matched detected phase signal P _CTL and the reference phase signal P _REF obtained based on the synchronization signal CTL, the phase servo state as to pass through the head 3A, 3B position of Sukiyana 1 The phase is controlled so that it can be obtained.

In this phase servo state, the rotary heads 3A and 3B of the scanner 1 are in a phase locked state with respect to the recording track TR of the tape 4, and the digital data D _RW picked up from the rotary heads 3A and 3B are processed by the processor 21. After signal processing such as deshuffling, error detection, and error correction, the reproduced data DATA is sent from the processor 21 to a recording / reproducing circuit (not shown). If processor 21 of this embodiment receives print data DATA from the recording and reproducing circuit when the recording mode, has been made the digital data D _RW after the data processing such Shiyafuringu to deliver the Sukiyana 1.

In addition to the above configuration, the processor 21 fetches digital data D _RW from the scanner 1
When the error rate of the digital data D _RW has decreased to a predetermined value or more, it transmits the mist Raţ King detection signal S _ER to the sequencer 22.

The sequencer 22 is rotated while responding enter the automatic tracking control operation mode connexion, a mist Raţ King detection signal S _ER supplied from the sequencer 22, to a phase lock signal LOCK received from the phase comparing circuit 13 when receiving the enable signal EN head 3A, and sends the phase control signal P _CON as to Jiyasu Toto Raţ King and 3B to the recording track TR. In this embodiment, the enable signal EN is separately supplied from the system controller when the VTR is set to the reproduction mode, the edit mode, or the automatic tracking mode by, for example, an operation of the operator, and the processing shown in FIG. The phase control signal _PCON is sent to the controllable delay circuit 14 of the capstan servo circuit 6 according to the procedure.

That is, first, as shown in FIGS. 4 and 5, when the rotary heads 3A and 3B land on the recording track TR,
The sequencer 22 enters the automatic tracking control program in step SP1 of FIG. 3, when receiving the enable signal EN at time t ₁ of FIG. 4, lock phase signals LOCK and mist Raţ King detection signal S at step SP2
While taking in and monitoring the _ER , an automatic tracking operation mode for controlling the phase of the magnetic tape 4 is entered. At this time, the sequencer 22 proceeds to step SP3, and the phase control signal P _CON
Is gradually increased from the initial phase 0.

The controllable delay circuit 14 controls the amount of phase delay by the phase control signal P _CON , thereby controlling the reference phase signal.
Change P _REF in a direction that gradually increases. In response, the phase comparison circuit 13 gradually shifts the phase of the magnetic tape 4 with respect to the heads 3A and 3B of the scanner 1 in the positive direction by gradually increasing the rotational phase of the capstan motor 7.

Since this time head 3A and 3B is in a state of Randeingu on recording tracks TR, processor 21 has not detected a mist Raţ King, maintains its mist Raţ King detection signal S _ER to a logic "0" level It is in a state of having done.

By the phase of the magnetic tape 4 goes shifted in the positive direction over time, head 3A, the 3B starts off the track, head 3A, the error rate of the digital data D _RW which is Yotsute pickup to 3B go large summer. Eventually the error rate at time t ₂ of FIG. 4 becomes greater than the predetermined value, processor 21 is a logic "0" the mist Raţ King detection signal S _ER detects the occurrence of a transfer connexion mist Raţ King step SP4 level Rises to "1" level. At this time the sequencer 22, by mist Raţ King detection signal S _ER is changed, and stores the lock phase [Delta] [phi = [Delta] [phi ₁ at this time takes in the lock phase signal LOCK.

Then the sequencer 22 determines whether the step SP5 moves connexion mist Raţ King detection signal S _ER is changed from a logic "0" level to the "1" level. Here, at the time of FIG.
Since t mist Raţ King detection signal S _ER in ₂ changes from a logic "0" level to logic "1" level, positive result in step SP5 is obtained, the sequencer 22 negative moves connexion lock phase Δφ in step SP6 It sends a phase control signal P _CON as to Yutsukuri change in direction. At this time, the phase comparison circuit 13 shifts the phase of the magnetic tape 4 in the negative direction via the capstan motor 7.

As a result, the heads 3A and 3B return to the tracking state, and shift so as to cross the recording track while maintaining the tracking state. Logic becomes in a state of mist Raţ King at the edge of the opposite heads 3A, processor 21 based on the digital data D _RW that is pickup from 3B is a mist Raţ King detection signal S _ER in Figure 4 time t ₃ of eventually The level is changed from “0” level to logic “1” level.

In response to this, the sequencer 22 responds to step SP7 in FIG.
To the transfer connexion lock phase signal LOCK that stores by connexion phase [Delta] [phi = [Delta] [phi ₂ to capture proceeds to the following step SP8.

This step SP8 is expressed by the following equation Expressed as in, step SP4 and SP7 phase [Delta] [phi ₁ and the average value a new locking phase of [Delta] [phi ₁₂ delta stored in
phi = calculated as [Delta] [phi _3, and sends the controllable delay circuit 14 so as the phase control signal P _CON.

The controllable delay circuit 14 by providing a reference phase signal P _REF corresponding to the lock phase to the phase comparator 13, drives and controls so as to lock the capstan motor 7 in this locking phase Δφ = Δφ _3. As a result, the rotating head 3A,
3B is a fourth view of the time t ₃ after the phase Δ represented by the formula (1)
It will scan recording tracks while locking the φ = Δφ _3.

Thus, in step SP9, the sequencer 22 ends the processing program for the automatic tracking operation mode for controlling the rotary heads 3A and 3B to a state where the recording tracks are just-tracked.

The automatic tracking operation, the phase corresponding to the center position after moving from one side edge of the recording track during the fourth diagram of the time t ₁ ~t ₃ automatic tracking operation period T _TR to the other side edge It means that the phase was locked.

The processor 21 at time t ₂ In this connection launched mist Raţ King detection signal S _ER from the logic "0" level to logic "1" level, the rotation head 3A, 3B of one side edge of the recording track TR It means that the processor 21 similarly raised the mistracking detection signal S _ER from the logic “0” level to the logic “1” level at the time t ₃ , whereas , The recording track
It means that it has moved to the other side edge position of TR. Therefore, the lock phases Δφ ₁ and Δφ _{2 at} times t ₂ and t ₃
Are locked to a lock phase that satisfies the average value Δφ ₃ (Equation (1)) of the recording tracks TR when the rotary heads 3A and 3B are phase-locked to phases substantially corresponding to the center positions on both side edges of the recording track TR. Is represented.

Thus, according to the configuration of FIG. 1, when the rotary heads 3A and 3B land on the recording track TR as indicated by reference numeral K1 in FIG. 5, once the front head side of the recording track TR is temporarily indicated by reference numeral K2. locking the phase [Delta] [phi = moves to a state shifted to the lock phase [Delta] [phi ₂ side edge after the track TR as indicated at K3 after shifted to [Delta] [phi _1, substantially the front edge and rear edge as shown in the subsequent reference numeral K4 Automatic tracking control can be performed in a state where the tracking is performed to the phase Δφ ₃ at the intermediate position.

In addition to this configuration, the sequencer 22 has a rotating head 3A,
3B, as indicated by the symbol K11 in FIG.
When the Randeingu at a position shifted outward from the rear edge of the sequencer 22, the logic level when loading the mist Raţ King detection signal S _ER in step SP2 of FIG. 3 is decreased to a logic "1" .

At this time the sequencer 22 by changing the lock phase Δφ in the positive direction in step SP3 (the time point t ₁₁ of FIG. 6), head inside the side cutting connexion track TR of the rear edge of the recording track TR at time t ₁₂ The phase of the magnetic tape 4 is controlled so that 3A and 3B move. By error rate of digital data D _RW is lower than a predetermined value at time t ₁₂ and the resulting Figure 6, processor 21 changes the mist Raţ King detection signal S _ER from the logic "1" level to the "0" level . Position K12 of rotating heads 3A and 3B at this time
FIG. 7 shows that the rotary heads 3A and 3B have moved to the trailing edge position of the recording track TR.

In this state, the sequencer 22 proceeds to step SP in FIG.
Proceeds to step SP10 to obtain a negative result in 5, and controlled to Yutsukuri changed in the positive direction to further continue the lock phase Δφ as the phase control signal P _CON, thus transected rotary heads 3A, 3B the recording track TR Then, as shown by reference numeral K13 in FIG. 7, the recording track TR is moved to the front side edge position.

Eventually head 3A at time t ₁₃ of FIG. 6, 3B position K
Coming to 13, the sequencer 22 is phase-controlled to return step SP7, SP8 to the transfer connexion rotary head 3A, and 3B to Jiyasu Toto Raţ King position K14, thus the time t ₁₃ after the rotating head 3A, Jiyasutotoratsu the 3B King lock phase Δφ = Δ
It can be phase locking to phi _3.

Thus, according to the configuration of FIG. 1, the enable signal
Even when the rotary heads 3A and 3B are in the mistracking position when EN arrives and mislanding on the recording track TR, the rotary heads 3A and 3B can be tracked to the just tracking position.

According to the above configuration, when the enable signal EN for commanding the automatic tracking operation arrives, the rotation heads 3A and 3B
In either case of landing on the recording track or mislanding, the rotary heads 3A and 3B can be reliably subjected to the tracking control to the center position of the recording track. Therefore, even in the case where the recording track TR is formed in a format that forms a tape pattern in which the track pitch is extremely narrowed for high-density recording, the head can be reliably tracked and controlled.

If a new signal is recorded on a magnetic tape recorded by another machine's VTR by insert editing or assemble editing, the conventional VTR has a track angle of several degrees and a tape edge wear of 20 to 20 degrees. If the recording pitch is 30 [μm], there is a risk of mislanding even if recording is performed at a recording density of approximately 50 [μm] in consideration of the linearity of the recording track TR. On the other hand, according to the above-described configuration, even if such a mislanding occurs, it is possible to reliably pull the mislanding into the just tracking position.

If the rotating heads 3A and 3B (and thus the scanner 1) can be track-controlled to the recording tracks TR on the magnetic tape 4 based on the reproduced signals picked up by the rotating heads 3A and 3B, the rotating drum Even when a scanner 1 having a reproduction head and a recording head separately mounted thereon is used, it is possible to insert and assemble a new track by using the recording head following the already recorded recording track TR. Also in this case, since the rotating drum 2 is formed of a rigid body having a small error (for example, only a few μm), it is possible to record a recording track having sufficient continuity substantially at the seam.

(G2) First Embodiment FIG. 10 shows a second embodiment of the present invention. In this embodiment, the sequencer 22 (FIG. 1) uses the recording track TR in step SP4 of FIG. Lock phase Δ of front side edge
After storing the φ = Δφ _1, until storing lock phase [Delta] [phi = [Delta] [phi ₂ of the rear edge at step SP7, so that increase the movement speed of the rotary head.

That is, in FIG. 10, as shown by the same reference numerals are applied to parts corresponding to FIG. 4, the rotation at time t ₂ heads
3A, when 3B is detected that come to the front edge position, the sequencer 22 as a calculation processing of FIG. 3 in step SP6 or SP10, rotating heads 3A, 3B only jumps amount [Delta] [phi ₀ predetermined value recording track TR at once to jump in the direction of the rear edge of the moving in a short time to lock the phase [Delta] [phi = [Delta] [phi ₄ position.

Then the sequencer 22 is rotated heads 3A, 3B Oyutsukuri and go moved to the rear edge side, eventually rotate at time t ₃₁ heads 3A, of FIG. 3 detects the arrival at the 3B are rear edge step SP7, Execute the processing of SP8.

Thus as compared with the case of FIG. 4 if, it is possible to reduce the jumps amount [Delta] [phi ₀ by the rotation head 3A, 3B to be cause it can have partial automatic tracking operation time movement at once T _TR.

In the case of using the rotating head moving method shown in FIG. 10, as shown in FIG. 11, when the head width H _W of the rotating heads 3A and 3B is sufficiently smaller than the recording track width T _W of the recording track TR, that is, H _W In the case of <T _W <T _P (2), the amount of jump Δφ _{0 is set} to Δφ ₀ (T _W −H _W ) (3) or Δφ ₀ <(T _W −H _W ) (4) ) Should be selected. Here T _P is Toratsukupitsuchi.

On the other hand, as shown in FIG. 12, the rotating heads 3A and 3B
If head width H _W is (recording method, such as the direction of the azimuth of the adjacent track is inverted) track width T _W than large and azimuth recording of the recording track TR, i.e. _{H W> T W = T P} ... ... (5) in the case of, since it is the relationship _{H W 2T W (= 2T P} ) ...... (6) between the head width H _W and track width T _W, [Delta] [phi ₀ and jumps Ryo [Delta] [phi ₀ (T _P ) Equivalent (7) or Δφ ₀ <(T _P ) Equivalent (8) The track width T _W (and therefore the track pitch T _P ) may be selected.

Incidentally, in FIG. 12, the rotating heads 3A and 3B have their own azimuth angles, and the recording tracks TR which are adjacent to each other in order.
(2) The recording data of TR4 (or TR1, TR3 ...) can be picked up by the rotary head 3A (or 3B).

When doing so, for example, rotating heads 3A at time t ₂ of FIG. 10 the first and second recording tracks TR1 and TR2
To by detecting the lock phase [Delta] [phi ₁ of the leading edge of the second recording track TR2 while straddling, the sequencer 22 after the second track TR3 only jump amount [Delta] [phi ₀ represented by the head 3A (7) equation Jump all at once to the position near the edge.

Thereafter, as shown at time t ₂ ~t ₃₁ of FIG. 10, heads 3A
If we Oyutsukuri and is moved in the direction of the trailing edge of the second track TR2, the while finally rotating head 3A at time t ₃₁ of FIG. 10 is straddles the second and third recording track TR2 and TR3 it is possible to detect the lock phase [Delta] [phi ₂ for the trailing edge of the second recording track TR2.

Then, in step SP8 (Fig. 3), the rotating head 3A
Is returned in the direction of the front edge by a lock phase which is half of the moving amount, so that the rotary head 3A can be controlled so as to be tracked to the second track TR2.

It should be noted that the rotary head 3B can be similarly controlled to perform the just tracking.

(G3) 13 Figure second embodiment shows a third embodiment, in this case the rotation head 3A, 3B is smaller with respect to track width T _W in the same manner as described above for Figure 11 heads having a width H _W.

When the center position of the track TR0 is to be tracked by the rotary heads 3A and 3B, when the enable signal EN arrives at the sequencer 22, there is a risk of mislanding as described above with reference to FIG. is there.

At this time, in the case of the embodiment of FIG. 13, in the same manner as described above with reference to FIG. 6, first, in step SP10 of FIG. 3, the rotation heads 3A and 3B are started to move in the direction indicated by the arrow a. However, in the case of FIG. 13, when the tracking state cannot be obtained even when the movement amount of the rotary heads 3A and 3B in the direction a reaches a predetermined value, for example, 1/2 pitch (that is, T _P / 2), The sequencer 22 returns to the initial state by moving the rotary heads 3A and 3B in the reverse direction as shown by the arrow b in FIG. 13, and then rotates the rotary heads 3A and 3B in the reverse direction as shown by the arrow c. Move.

In FIG. 13, the rotating heads 3A and 3B are directed in the direction of arrow a.
Sequencer 22 despite moving by 1/2 pitch
It but can not get tracking information, rotating heads 3A, than the position of the 3B causes the tracking to track TR1 on the direction a side, reverse tracks TR0 to the tracking operation is to it is automatic tracking operation period T _TR
Means that the position is smaller. Therefore, if the tracking conditions cannot be obtained by moving the rotary heads 3A and 3B in the direction a during 1/2 pitch, the tracking conditions must be obtained by moving the rotary heads 3A and 3B in the opposite direction. it is possible to effectively shorten the automatic tracking operation time T _TR by.

In the embodiment shown in FIG. 13, the amount by which the rotating heads 3A and 3B are moved in the direction a is such that a plurality of N rotating heads are mounted on the scanner 1, and accordingly, each head has N recording heads on the tape. When scanning is performed for each track, the amount of movement in the direction a may be selected to be about _NTP / 2.

(G4) Other Embodiments (1) In the above embodiment, as described above with reference to FIGS. 4 and 6, the value of the lock phase signal LOCK when the enable signal EN arrives is set to the initial phase Δφ = 0. The embodiment in which the change in the lock phase Δφ is detected thereafter has been described. Instead, as shown in FIGS. 8 and 9, the rotating heads 3A and 3B are provided on one side edge of the track TR. Assuming that the lock phase Δφ when moving is Δφ = 0,
Thereafter, the lock phase until moving to the other side edge Δφ = Δ
Even when φ ₂₁ Δφ ₃₁ is detected, the same effect as in the above case can be obtained.

In the case of this embodiment, in addition to this, the use of the binary counter to begin counting from practice time t ₂ or t _12, the calculation of the values of the tracking-lock phase [Delta] [phi ₃ to digit shift technique Thus, the configuration as a whole can be simplified.

(2) In the embodiment shown in FIGS. 4 and 6, the rotation head is moved continuously, but the inclination is quantized so as to change stepwise. Thus, the same effect as in the above case can be obtained.

(3) In the above-described embodiment, the case has been described in which the lock phases of the rotating heads 3A and 3B with respect to the recording track TR are detected based on the synchronization signal CTL recorded in the longitudinal direction of the magnetic tape 4. But magnetic tape 4
The means for detecting the phase of the recording track TR is not limited to this, and various means may be used.

(4) In the above embodiment, the processor 21 (first
Figure) to obtain the mistracking detection signal S _ER
Rotating heads 3A, it has dealt with the case of by connexion formed to monitor the change in the error rate of the digital data D _RW that Yotsute pickup to 3B, the error correction for example digital data D _RW not limited thereto may be generated mist Raţ King detection signal S _ER based on this time has ceased can.

H Effects of the Invention As described above, according to the present invention, when a rotating head is tracked on a recording track recorded on a tape, the head is moved so as to obtain a tracking condition for one side edge of the recording track. After the head is moved until the tracking condition can be obtained for the other side edge, the rotary head is moved to an intermediate position between the two positions where the tracking condition is obtained, so that the rotary head is moved. It is possible to reliably perform the tracking at the center position of the recording track.

According to the first aspect of the present invention, the rotary head is jumped while the lock phase of the rotary head is moved from the first lock phase to the second lock phase, so that the rotary head is correspondingly on the tape. In this case, the tracking control time from landing to the just tracking state can be shortened.

Further, in the second invention, even if the lock phase of the rotary head is not changed to the phase lock state even if the lock phase is continuously changed by a predetermined amount, the change direction of the lock phase is reversed to search for the phase lock state. Thus, when the rotating head mislandes in the area between the recording tracks, the rotating head can be phase-locked to the closest one of the two side edges of the recording track, and as a result, the rotating head can land on the tape. The tracking control time from the start to the just tracking state can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a tracking control device according to the present invention, FIG. 2 is a schematic diagram showing a recording pattern of the magnetic tape 4, and FIG. 3 shows a processing procedure of the sequencer 22 in FIG. Flow charts, FIGS. 4 and 5, FIG. 6 and FIG. 7 are respectively a curve diagram and a schematic diagram showing a change in the lock phase of the rotating head during the automatic tracking operation, and FIG. 8 and FIG. 10 to 12 are a curve diagram and a schematic diagram for explaining a change in the lock phase of the rotary head in the first embodiment, and FIG. 13 is a second diagram of the second embodiment. FIG. 7 is a schematic diagram illustrating a change in a lock phase of a rotating head in the embodiment. 1 ... scanner, 3A, 3B ... rotary head, 4 ... magnetic tape, 5 ... capstan, 6 ... capstan servo circuit, 7 ... capstan motor, 21 ... processor
22 …… Sequencer.

Claims (2)

(57) [Claims] 1. An information recording / reproducing apparatus wherein information recorded on a recording track is picked up by controlling tracking of the rotating head on a recording track formed on a tape. By controlling the lock phase of the tape with respect to the rotary head when landing on the recording track, the rotary head is brought into a first phase lock state in which the rotary head is phase-locked to one side edge of the recording track. The rotary head is jumped by a predetermined amount of phase in a direction in which a second phase lock state in which the head is phase-locked to the other side edge of the recording track is obtained, and then the rotary head is brought into the second phase lock state. A first lock phase and a second phase lock state in the first phase lock state. Second in state
A tracking control device, wherein the rotation head is phase-locked to a center lock phase between the lock phases. 2. An information recording / reproducing apparatus in which information recorded on a recording track is picked up by controlling tracking of a rotating head on a recording track formed on a tape. By controlling the lock phase of the tape with respect to the rotating head when landing on the recording track, when the rotating head is mislanded in the area between the recording tracks, the locking phase with respect to the rotating head is changed to the second phase. 1 and then continue to change in the first direction by a predetermined amount of phase, when the rotary head does not enter a state of phase locking on one side edge of the recording track, the rotation of the rotary head is stopped. The direction in which the lock phase is changed is reversed in the second direction to return to the initial state, and then After changing the lock phase to the rotation head in the second direction, the rotation head is brought into a first phase lock state in which the rotation head is phase-locked to the one side edge of the recording track, and then the rotation head is set to the above-mentioned state. A second phase lock state is applied in which the other side edge of the recording track is phase locked, and then the center between the first lock phase in the first phase lock state and the second lock phase in the second phase lock state. A tracking control device, wherein the rotation head is phase-locked to a lock phase.