JPS61263376A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To shorten the pull-in time of tracking control when shifting by making the time series of reproduction pilot signal and of local pilot signal coincide with each other when shifting from a still picture reproduction to a normal reproduction with a magnetic tape. CONSTITUTION:In case of shifting from the still picture reproduction to the normal reproduction using a magnetic tape, a start-up signal ST synchronized with the rising of a head phase-detection signal SW is supplied by a system control circuit to the S-terminal of a D-FF 100 via a terminal 38. Thus the cut-off state of an AND gate 101 is released, the time series circulation of the local pilot signal is started again, and the time series of the reproduction pilot signal and the local pilot signal are made coincident with each other. Thus, by controlling the local pilot signal, a disorder in the tracking control system due to dissidence in time series of pilot signals at the time of shifting from still picture repro ducing state to normal reproducing state, is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a magnetic recording/reproducing device C, and in particular, to applications ranging from still image reproduction. The present invention relates to a magnetic recording and reproducing device that shortens the pull-in time of tracking control when shifting to normal reproduction.

(Background of the invention) In 8mm video, a 4-frequency pilot signal as seen in Japanese Patent Application Laid-open No. 116120/1984 is superimposed on a video signal and recorded on a video track, and during playback, this pilot signal is used for tracking control. A method (hereinafter referred to as the human TF method) is adopted.

This ATF method superimposes a so-called pilot signal onto a video signal, etc., so that adjacent tracks have different frequencies, so four frequencies are used! It f! By recording cyclically in the order of + fs + f4 and controlling the tape speed so that the amount of crosstalk between pilot signals reproduced from both adjacent tracks is equal during playback, the video track can be scanned correctly by the rotating head during playback. This is a tracking control method designed to
The frequency of is determined, for example, as follows, where fH is the horizontal synchronizing signal frequency of the video signal.

In this tracking control method using pilot signals, local pilot signals with the same four frequencies as the pilot signal recorded on the tape are sent in the same order fl+f as when recording.
! + r,, generated cyclically with f4.

This local pilot signal and the reproduced pilot signal from the tape. A method is used in which the difference frequency components fH and 3 fH are detected and the difference between the two is detected as a tracking error signal. However, the above two components ra and 3
fH is detected correctly and a correct tracking error signal is obtained only when the time series of the 4-frequency local pilot signal matches the time series of the 4-frequency reproduced pilot signal from the tape; otherwise, it is correct. No tracking error signal is obtained ◇For this reason, a false tracking error signal is detected during the period until the time series of the local pilot signal and the regenerated pilot signal match.
Tracking control is disturbed, leading to longer pull-in times or hunting in the control system, resulting in unstable operation.

On the other hand, as seen in Japanese Patent Application Laid-Open No. 59-34775, in a rotating head helical scan VTR, in addition to the normal recording and playback in which recording and playback is performed by running a magnetic tape at a constant speed, the movement of the reproduced image is stopped and viewed. Therefore, some devices have a still (still image) playback function that stops the running of the magnetic tape and plays it back. This still function stops the running of the magnetic tape, so when stopping still playback and returning to normal playback, the time series of the local pilot signal and the playback pilot signal from the tape will be changed as described above. There is a problem that they do not necessarily match, and tracking control is disturbed.

(Object of the Invention) An object of the present invention is to provide a tracking control device that shortens the control pull-in time when returning from still playback to normal playback in a tracking control method using a four-frequency pilot signal. be.

(Summary of the Invention) In order to achieve the above object, the present invention provides a magnetic tape at the time when normal playback is started from a still raw magnetic tape.

The present invention is provided with means for matching the time series of the reproduced pilot signal and the local pilot signal reproduced from the magnetic tape, thereby shortening the pull-in time of tracking control at the time of transition from still reproduction to normal reproduction state.

(Example of the invention) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing an example of the configuration of a rotating head helical scan type VTR according to the present invention. Also, the second
The figure shows an example of a video track on a magnetic tape recorded by frequency multiplexing a pilot signal with a video signal, and an example of a head scanning trajectory during still playback.The solid line in the figure indicates the video track, and the broken line indicates the video track. The head scanning locus for field still playback is shown.

In FIG. 1, during recording, a magnetic tape 1 is driven by a capstan 2 and travels in the direction of the arrow. This capstan 2 is rotationally driven in the direction of a solid arrow a by a capstan motor 3. On the other hand, two video heads 5. are attached to the disk 4 180 degrees apart from each other.
6 is rotationally driven by a disk motor 8 and rotates in the direction indicated by the broken line arrow. This disk 4 is attached to a rotating shaft inclined with respect to the longitudinal direction of the tape 1, and is driven to rotate at a frequency η which is the vertical synchronizing signal frequency of the recorded video signal.

Therefore, the video heads 5 and 6 alternately scan the tape 1 from bottom to top in a diagonal direction,
Video signals are recorded on each video track in units of fields. The video heads 5.6 have mutually different azimuth angles, which makes it possible to record without providing a guard band, as shown in FIG.

The video signal applied to the terminal 9 and the recording pilot signal RBCPLT generated by the pilot signal generation circuit 10
are added by an adder 11 and then amplified by a recording amplifier 12. The recording signal R8 is then supplied to the video head 5.6 via the rotary transformer 13 and recorded on the video track on the tape 1.

In FIG. 2, fl""'4 indicates a pilot signal recorded on each video track. As mentioned above, the frequencies of these pilot signals are selected to be low enough to be unaffected by the azimuth angle of the video head.

Next, the operation during playback will be explained. In FIG. 1, the rotational phase of the video head 5.6 is detected by the tack head 14, and this detection signal is sent to the phase adjustment circuit 15. The head phase detection signal SW, which is the output thereof, and the terminal 16
The phase is compared with the reference signal REF in the phase comparator 17,
The phase error signal is fed back to the disk motor 8 via the disk motor drive circuit 18. By doing so, the video heads 5 and 6 are rotated in phase synchronization with the reference signal RBF.

On the other hand, the rotational speed of the capstan motor 3 is measured by the speed detector 1.
9, and this detection signal, the CFG signal, is sent to the frequency discriminator 20, and the speed control voltage 8P according to the number of rotations is detected.
It is converted to D. This voltage SPD is applied to the adder 21. It is supplied to the capstan motor 3 via the capstan motor drive circuit 22. In this way, the speed of the capstan 2 is controlled so that it rotates at approximately a predetermined speed.

Further, the signal reproduced from the tape l by the video head 5.6 is sent to the preamplifier 23 via the rotary transformer 13.
is sent to and amplified. The amplified playback signal RF is sent to the video signal processing circuit z4 to become a playback video signal, while being passed through the low-pass filter 25 to a playback pilot signal PB.
The signal becomes PLT and is sent to the frequency converter 26.

35 is a local pilot signal control circuit, which generates the following gate signals 01 to G4 in the case of normal playback other than still playback described later, and controls the pilot signal generation circuit 1.
Controls 0. That is, according to the head phase detection signal SW which is the output of the 1-phase adjustment circuit 15, in other words, the video head 5 scans the tape 1 every field period in which the video heads 5 and 6 scan the tape 1. During the period, the local pilot signal f or f is applied, and during the period when the video head 6 scans the tape l, the local pilot signal f or f4 is applied, and fl+ft+f
! Pilot signal generation circuit 1 cyclically due to j error of +f4
0 is generated, the local pilot signal control circuit 35 outputs a gate signal G+ -G4 (for example, G, -@
H” is f,,G, “@H” is f,,G, “-H” is f,
.

The pilot signal generating circuit 10 is controlled by the gate signals G to G4. In this way, the local signal generated from the pilot signal generating circuit 10 is Pilot signal LOCPL
T is sent to frequency conversion circuit 26.

In the frequency conversion circuit 26, the regenerated pilot signal PB
PLT is the local pilot signal LO[.

The frequency is converted by the PLT, and the frequency conversion circuit 26
The difference frequency component between the two is output from this difference frequency component, which is the crosstalk component of the pilot signal from both adjacent tracks.

3fi is extracted by BP1i'27.28, and the difference between the two is determined by the differential amplifier 29. This difference signal is based on the level of the pilot signal detected from both adjacent tracks of the main track that the head is trying to scan. The direction of increase/decrease of the difference frequency signal with respect to the direction of tracking deviation differs for each field. Therefore, by switching between a signal passing through the inverter 30 and a signal not passing through the inverter 30 for each field using the switch 31, a correct tracking error signal TR can be obtained. This error signal T
R is the adder 21. It is fed back to the capstan motor 3 via the capstan motor drive circuit 22, thereby controlling the rotation of the capstan 2.

Next, we will briefly explain the operation during still playback.

Normally, in the normal playback state, that is, the playback pilot signal PB PLT from tape 1 and the local pilot signal LO
When starting one still playback from a state where the time series of CPLT matches, a still playback command signal PA is sent to the terminal 32.
USB (Still playback with “H”.

When the still playback command signal PAUSE is input to the system control circuit 33 to which still playback cancellation is applied ("L"), the system control circuit 33 outputs a braking signal BRF! that is synchronized and delayed with the head phase detection signal SW.
Output AK. The braking signal BRII! While tAK is sent to the local pilot signal control circuit 35, it is also sent to the capstan motor control circuit 34I. When the braking signal BREAK is input to the capstan motor control circuit 34, a braking signal is sent from the capstan motor control circuit 34 to the capstan motor pivot circuit 22, and the capstan motor drive circuit 22 controls the rotation of the capstan motor 3. stop. On the other hand, the local pilot signal control circuit 35 includes a pilot signal generation circuit lO as described later.
It outputs gate signals G, ~G4 to control the generation of local pilot signal LOG PLT.

When the rotation of the capstan motor 3 is stopped and still playback starts, the video head used for still playback is
In order to realize field still, video head 5 and
A video head 7 having an azimuth angle in the same direction as the video head 5 is used. At this time, the video tracks traced by these video heads 5 and 7 are as shown in FIG. 2(a) because the time series of the reproduced pilot signal PBPLT and the local pilot signal LOCPLT coincided before the still playback. , pilot signal f3
or the video track in which the
), this is the video track where the pilot signal f1 is recorded.

In this way, during still playback, the pilot signal f3
or the video track on which fl is recorded is played back by the video heads 5 and 7.

Next, when canceling still playback, connect ""L# to terminal 32.
When the L# level is applied, a start signal 8T is generated from the system control circuit 33 in synchronization with the falling phase of the head phase detection signal SW.This start signal 8T is sent to the local pilot signal control circuit 35. On the other hand, it is sent to the capstan motor control circuit 34.

When the start signal 8T is input to the capstan motor control circuit 34, a start signal is sent from the capstan motor control circuit 34 to the capstan motor start circuit 22, and the stoppage of the rotation of the capstan motor 3 is released. When returning from playback to normal playback, the local pilot signal LO is activated during still playback like in conventional equipment.
If the CPLT is not controlled, the disk 4 is still rotating even during still playback, so the phase adjustment circuit 1
A head phase detection signal SW, which is the output of No. 5, is output.

The local pilot signal LOCPLT is successively updated by this head phase detection signal SW. Therefore, at startup when still playback is canceled, the time series of the playback pilot signal from tape 1 and the local pilot signal L
This does not necessarily match the OCPLT time series, and disturbances occur in the tracking control system. The influence of this disturbance appears as noise on the playback screen since the video head is in the playback state.

In the case of still playback, due to the nature of its function, the present invention
As described above, the video track that the video head scans during still playback is determined based on the relationship with the azimuth angle given to the video head. Moreover,
In the normal playback state before shifting to the still playback state, the time series of the playback pilot signal PB PLT from the tape and the local pilot signal LOCPLT match. Therefore, as will be described in detail later, it is possible to match the time series of the reproduced pilot signal at the start of normal reproduction and the local pilot signal based on the local pilot signal immediately before still reproduction. Therefore, the disturbance that occurred in the conventional device is eliminated, and tracking control can be pulled in early when transitioning from still playback to normal playback.

Next, using FIGS. 2, 3, and 4, a first embodiment of the local pilot signal control circuit 35 of the present invention that can make the transition from the still playback state to normal playback without disturbance will be described. will be explained in detail.

The feature of the first real m-series is that during still playback, the time-series circulation of the local pilot signal is stopped together with the pyroft signal recorded on the video track scanned by the video herard, and when transitioning to normal playback. The purpose is to restart the time-series circulation of the local pilot signal at startup.

FIG. 3 is a circuit block diagram showing one embodiment of a local pilot signal control circuit according to the present invention. Also, the fourth
In the local pilot signal control circuit configured as shown in FIG. 3, the diagrams (,) to - show the scanning of the video heads 5 and 7 during the still playback state as shown in FIG. 2(a). This is a timing diagram showing the signal waveforms of various parts when the video track is a track where a pilot signal f is recorded. Point A (boundary between normal playback and braking) in FIG. (11) shows the point in time when the video head 6 starts scanning the λ point.

In Figures 3 and 4, first, during normal playback, terminal 3
Head phase detection signal $W added to 6 [Figure 4 (a)
8W) is D-7 lip 70 tube (abbreviated as D-FF).
100 data terminals, an AND gate 101, and an inverter 108t are input. The output Ql (FIG. 4(f) Q+') of the D-FF 100 is also input to the AND gate 101, and the output Ql of the D-FF 100 is inputted to the AND gate 101 during normal playback.
00 is in the set state, and the head phase detection signal sw is output as is to the output of the AND gate 101.

The output of the AND gate 101 (Tt in FIG. 4(g)) is input to the clock terminal T of the T-FF 102, while the output from the
07 is input.

T-FF 102 converts the output of AND gate 101 into 14
The frequency is divided and output in both positive and negative phases [Figure 4 (b) q*
). The positive phase output Q2 of the T-FP 102 is sent to the AND gates 104 and 107 as the negative phase output Q2 of the T-FF 102.
z (not shown) is input to AND gates 105 and 106. The output of inverter 103 is AND gate 1
04,106, and Fig. 4 (+)Gt~(
4G4, every time the head phase detection signal SW changes, the gate signals 01 to G, ltj are sequentially circulated next to @H'' for one field time, and local pilot signals are output in the order of fl+f2+flll f4. [FIG. 4] LOCPLT) Next, the operation during still reproduction will be explained.

When transitioning to the still playback state, the head phase detection signal SW [Fig. 4(a) 8] is sent from the system control circuit 33.
A braking signal BREAK (BRBAK in FIG. 4(c)) which is synchronized and delayed (DELAY in FIG. 4(b)) with W) is output. As a result, the capstan motor stops running the tape, but a description of the various operations of the capstan motor will be omitted here.

Braking signal BR from this system control circuit 33
BAK is input to AND gate 109 from terminal 37. On the other hand, the head phase detection signal SW inverted by the inverter 108 is also input to the AND gate 109. AN
D The inverted signal of the head phase detection signal SW that has passed through the gate 109 [Fig. 4(a)'r+1) is connected to the black terminal T,
is applied to Since the rising phase of the signal applied to the clock terminal T1 (FIG. 4(d)'r+) is delayed while the head phase detection signal SW passes through the inverter 108 and the AND gate "109," This is delayed from the falling point corresponding to the rising edge of the head phase detection signal SW input to the data terminal.

Therefore, the D-FF100 takes in data when the head phase detection signal SW input to the data terminal is at L level, and the output Q of the D-FF100 is "L".
level.

Here, the signal duration of the braking signal BREAK is determined based on the condition that no noise occurs on the tape pattern (not shown).
The delay signal DBLAY is determined to be at least 1.5 field times and no more than 2 field times.
It is set to be less than one field time.

As mentioned above, before the output Q1 of the D-FFIOQ becomes "L" level and the %AND gate 101 is cut off, the fall of the head phase detection signal sw is detected by the AND gate 101.
'lol has been input, so AND gate 1
When 01 is in the cut-off state I, the gate signal G becomes @
It is at H level.

Therefore, the time-series circulation of the local pilot signal stops at the local pilot signal f.

As mentioned above, the scanning tracks of the video heads 5 and 7 in the still playback state are shown in FIG. 2 (+1
), the track on which the pilot signal f is recorded, that is, the reproduced pilot signal PBPL'I' from the tape is f3.

Next, when transitioning from still playback to normal playback, an activation signal (84
(e) IT) is connected to the D-FF Zo from the system control circuit 33 via the terminal 38.

is applied to the 8 terminals of By this, AND game l-
101 is released, and the local pilot signal 1. The time series circulation of QCPLT is restarted from fl above. As a result, the regenerated pilot signal PB PLT
Similarly, the scanning track of the video head 5.7 in the still playback state can match the time series of the local pilot signal LOCPL'l'.
Even in the case of a track where the pilot signal f8 is recorded as shown in FIG. PLT and local pilot signal LOC
By controlling the local pilot signal in this way, the tracking control system is prevented from being disturbed by the mismatch in the time series of the pilot signals when transitioning from the still playback state to the normal playback state. Next, using FIGS. 5 and 6, we will discuss a second embodiment of a local pilot signal control circuit suitable for transitioning from a still playback state to normal playback according to the present invention. 〇The feature of the second embodiment is that the time-series circulation of the local pilot signal is combined with the local pilot signal in the normal playback state immediately before still playback, and the pilot signal recorded in the scanning track of the video head during still playback. 1 The purpose is to change the time-series circulation of the local pilot signal at startup when transitioning to normal playback. The difference from the first embodiment is that the local pilot signal may be in any state during the still playback period.

FIG. 5 is a circuit block diagram showing an embodiment of the local pilot signal control circuit according to the present invention. Also, the 6th
Figures (a) to -- show the fifth wave in the still playback state as shown in Figure 2(a), that is, when the pilot signal of f3 is recorded on the scanning track of the video heads 5 and 7. FIG. 3 is a timing diagram showing signal waveforms at various parts of the circuit shown in the figure.

Similarly to FIG. 4, point λ in FIG. 6 indicates the point in time when the video head 6 starts scanning point A in FIG. 2(d).

5 and 6, first, during normal reproduction, the head phase detection signal swC applied to the terminal 36 (a
)8W) is the clock terminal T of T-FF 115.

and the positive phase output Ql of the oT-FF 115 which is input to the inverter 114 and the AND gates 117 and 119 (see Fig. 6).
b) qt) is input to AND gates 116 and 119, and the negative phase output QI [not shown] is input to AND gate 11
7,118. The output of the inverter 114 is
The gate signal G is inputted to AND gates 116 and 118 each time the head phase detection signal SW changes, as shown in FIG. 6(c) G+ to (r) G4.

~G4 is sequentially ``H#'' for l field time.
The local pilot signal is changed to fl+f! +
output in the order of fatf4. C Figure 6 (m)
LOCPLT) Next, the operation during still playback will be explained.

When transitioning to the still playback state, the head phase detection signal Sw [Fig. 6(a) 8] is sent from the system control circuit 33.
Braking signal BaEAK synchronized and delayed with W) [Figure 6 (g
)] is output. This braking signal BRBAK is applied to terminal 37.
is input to the AND gate 122.

On the other hand, the head phase detection signal SW inverted by the inverter 114 is also input to the AND gate 122 .

Therefore, as explained in FIGS. 3 and 4, D-
FF 11 Q connects the gate signal G3 to the data terminal at the falling point of the head phase detection signal (the rising point of rt in FIG. 6(h)) during the period of the braking signal BBBAK.
At this point in time, the gate signal G
Depending on the state of , the video head 5. in the still playback state.
The pilot signal recorded on the scanning track of 7 is f
, or t3.

Here, as shown in FIG. 2(a), the track scanned by the video head 5.7 during still playback is the track in which the pilot signal f is recorded, so the gate signal G at the time of capture is is ``H'' (Figure 6 (e) G
S). For this reason, the positive phase output Q of D-FF 110
X (FIG. 6(i) Qt) becomes "H".

In other words, the point on the time series at which the time series circulation of the local pilot signal starts during braking is held.

Next, when transitioning from still playback to normal playback, in synchronization with the fall of the head phase detection signal 8W, the start signal 8T (sixth Figure (j) 8T) is connected to the resistor 111, capacitor 112 . Inverter 113, AND gate 11
4. The rising edge of the start signal 8T is detected by the AND gates 120 and 121.
send to On the other hand, the positive phase output Q of D-FF 110, [
In FIG. 6(t) qt), the AND gate 1211 is input, and the negative phase output qt (not shown) is input to the human ND gate 120.

Therefore, depending on the state Iζ of D-FFIIO, the activation signal 8
By setting or resetting the T-FF 115 at the rising edge of T, the time series of the local pilot signal is changed.
If the pilot signal recorded on the scanning track 1 is f3, the T-FF 115 is reset [see Fig. 6 (
b) R1 + Figure 6 (b) qt), the local pilot signal will start circulating from f3 at startup [
Figure 6(m) LOCPLT), regenerated pilot signal PBPLT and local pilot signal LOCPLT
Similarly, the scanning track of the video head 5°7 in the still playback state is determined by the pilot signal f1 as shown in FIG. 2(b).
Even in the case of a track on which the local pilot signal is recorded, it is possible to match the time series of the reproduced pilot signal and the local pilot signal at startup.

Next, a third embodiment of a local pilot signal control circuit suitable for transitioning from a still playback state to normal playback according to the present invention will be described using FIGS. 7 and 8.

Similar to the third embodiment, the tape is run so that the video track scanned by the video head during still playback is the video track on which the pilot signal of a specific one of the four frequencies is recorded. By stopping the local pilot signal, when starting from the still playback state to normal playback, the local pilot signal is circulated in time series starting from the specific pilot signal.

FIG. 7 is a circuit block diagram showing an embodiment of the local pilot signal control circuit according to the present invention.

Furthermore, in the local pilot signal control circuit configured as shown in FIG. 7, FIG. , 7 is a timing chart showing signal waveforms of each part when the pilot signal recorded on the scanning track of 7 is f.

In Figures 7 and 8, first, during normal playback, terminal 3
Head phase detection signal SW added to 6 [Fig. 8(d)
8W] is the clock terminal T of %T-FF 130 .

is input to the inverter 135 and AND gates 137 and 139. T-PF 13 G positive phase output Ql (8th
(b) qt) is input to AND gates 136 and 139, and negative phase output Q (not shown) is input to AND gates 137 and 138. , 138, and each time the head phase detection signal SW changes as shown in FIG. 8(C) Gl to (f) G4, the gate signals 01 to G4
is sequentially circulated as @H” for one field time,
The local pilot signal is fl+r,, r,, f
Output in lit order of 4 [Figure 8 (i) LOCPLT
).

Next, the operation during still playback will be explained.

During still playback, as described above, tape running is stopped so that the video track scanned by the video head in the still playback state is the track where the pilot signal f is recorded. Although we will not discuss the method of stopping the vehicle in detail, 1For example, there is a method that uses the time series circulation of the local pilot signal (that is, 0 that matches the time series of the reproduced pilot signal) in the normal reproduction state before the still reproduction state. Conceivable.

Next, the operation at startup will be explained.

In the same way as explained using FIGS. 5 and 6, in synchronization with the fall of the head phase detection signal, the starting signal 8T (8T in FIG. 8(g)) is applied to the resistor through the terminal 3B. 131,
The signal is sent to a rising edge detection circuit consisting of a capacitor 132, an inverter 133, and an AND gate 134 to detect the rising edge of the starting signal 8T (R, in FIG. 8(h)). Then, the T-PF 130 is reset at the rising edge. T-P
At the time when F13G is reset, the head phase detection signal SW input to the terminal 36 is always at the "L" level, so the gate signal G becomes "H". For this reason,
The local pilot signal LOCPLT output from the pilot signal generation circuit 10 becomes the same.

As described above, according to this embodiment, the time series of the local pilot signal is changed to a time series cycle starting from the local pilot signal f, and the time series of the regenerated pilot signal and the local pilot signal can be made to match. .

By controlling the local pilot signal in this way, it is possible to eliminate the disturbance in the tracking control system due to the mismatch in the time series of the pilot signal when transitioning from the still playback state to normal playback, making it possible to perform early pull-in. , performance is improved.

However, the present invention is based on the above-mentioned item 1. As in the second and third embodiments, even if the track scanned by the video head during still playback is recorded by the video head 61 and the pilot signal f or f4 is recorded, the above embodiments can be applied. By making appropriate changes, similar effects can be obtained and are effective.

In addition, in the above embodiment, the case has been described in which the head phase detection signal SW1, the braking signal BREAK, and the starting signal 8T are used.1 The present invention is not limited to this, but can be applied to the case where a signal newly created from each of the above signals is used. is also valid.

Furthermore, in the above embodiment, a case was described in which a video signal or the like is recorded and reproduced, but the present invention is a magnetic recording system in which pilot signals are multiplexed regardless of C and L, and tracking control is performed using the pilot signals during reproduction. As long as it is a playback device, the above embodiment can be modified as appropriate, and is effective regardless of the content or type of the signal to be recorded.

(Effects of the Invention) As described above, according to the present invention, it is possible to prevent the tracking control system from being disturbed due to the time series mismatch of pilot signals when transitioning from the still playback state to normal playback, and to prevent control pull-in. It can save time and improve performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of a helical scan VTR according to the present invention, FIG. 2 is a tape pattern diagram, and FIG.
5 and 7 are block diagrams and FIG. 4, respectively, showing an embodiment of the present invention. 6 and 8 are timing diagrams of signals of the main parts of the block diagrams of FIGS. 3, 5, and 7, respectively. 10... Pilot signal generation circuit, 33... System control circuit, 35... Local pilot signal control circuit Fig. 2 Fig. 3 L
J3 g 3 s 3 3 3 g
3 5';il = ↓5th Figure 32 3'Fi3 83g3:5J ε ↓5th
7 Figure

Claims (4)

[Claims] (1) A means for separating a four-frequency pilot signal from a reproduction signal of a magnetic tape in which a four-frequency pilot signal is sequentially and cyclically multiplexed with a main signal every scanning period of a magnetic head in a predetermined order; a local pilot generation circuit that generates a local pilot signal of equal frequency in relation to the scanning period of the magnetic head; and a tracking error detection circuit that generates a signal according to the tracking error of the magnetic head from the pilot signal and the local pilot signal. In a magnetic recording and reproducing apparatus having a circuit, a device for performing tracking control based on the tracking error signal, and a device for stopping the running of the magnetic tape and further transporting the magnetic tape, a transition is made from a still image reproducing state to a normal reproducing state. A magnetic recording and reproducing apparatus characterized in that the magnetic recording and reproducing apparatus is provided with means for matching the time series of the pilot signal and the local pilot signal at the time when the pilot signal and the local pilot signal are acquired, thereby shortening the pull-in time of tracking control. (2) The means for matching the time series of the pilot signal and the local pilot signal stops updating the time series of the local pilot signal when the magnetic tape stops running. The magnetic recording and reproducing device according to scope 1. (3) A point in time when the means for matching the time series of the pilot signal and the local pilot signal identifies the local pilot signal when the magnetic tape stops running, and starts transferring the magnetic tape from the stopped state. in,
2. The magnetic recording and reproducing apparatus according to claim 1, wherein the time series of the local pilot signal is changed based on the identification result. (4) The means for matching the time series of the pilot signal and the local pilot signal is configured such that when the magnetic tape stops running, a pilot signal of a predetermined one frequency among the four-frequency pilot signals is recorded. controlling a stop position so that the video head scans a track on the magnetic tape; and at the start of transport of the magnetic tape, the time series of the local pilot signal is based on the predetermined one-frequency pilot signal. The magnetic recording and reproducing apparatus according to claim 1, characterized in that the magnetic recording and reproducing apparatus is modified by: