JP2794658B2 - Playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION   The present invention will be described in the following order. A. Industrial application fields B. Summary of the Invention C Conventional technology D Problems to be solved by the invention E Means to solve the problem F action G Example   G₁Description of the configuration of the tracking control unit (FIG. 1)   G_TwoDescription of operation during slow playback (FIGS. 2 and 3) H Effect of the Invention A. Industrial application fields   The present invention relates to a rotary head type reproducing apparatus,
The so-called ATF (automatic
Tracking finding) method,
In particular, it relates to a tracking technique at the time of variable speed reproduction. B. Summary of the Invention   According to the present invention, the tape is played at the normal playback speed (at the same
At the same speed), apply the brake to stop the tape,
When the tape is stopped, the signal is reproduced by the rotating head.
Speed-change playback such as slow playback and still playback.
When rotating the tape at normal speed,
Generated based on the playback pilot obtained from the
The braking amount is controlled according to the locking error.
When the tape stops, the optimal tracking position is
Or by ATF tracking control.
Playback position that can be set to the optimal tracking position
It is to become. C Conventional technology   For example, in the case of 8 mm video,
Then, using a rotating head for video signals,
The ATF system that performs racking control is adopted.   This tracking control method is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-6596.
Record video signals as described in No. 2
The track is overlapped with the track by the rotating head.
The pilot signal for King is recorded,
Detects the amount of crosstalk of this pilot signal from the
To perform tracking servo. For this reason,
The pilot signal is a video signal viewed from the frequency spectrum.
Signal during playback as a low-frequency signal where no recorded signal exists.
Frequency multiplex recording to facilitate separation of
Azimuth loss does not reduce crosstalk much
Such a low frequency is selected.   First, an outline of the tracking control method will be described.
You.   This example circulates pilot signals at four different frequencies
Frequency-multiplexed recording on diagonally tracks
You. For example, as shown in FIG.
Two rotating heads HA and HB are arranged at an interval of 180 °
When recording is performed using the rotating head device, the sixth
As shown in the figure, the recording track
Are sequentially formed by these two rotating heads.
And four different frequencies f with the recording of the video signal₁, f_Two, f_Three, f
_FourThe four pilot signals are sequentially transmitted as shown in FIG.
Changed for each track one by one and recorded cyclically
Things.   That is, as shown in FIG.
Every other truck T₁, T_ThreeIs formed by FM modulation
The recorded video signal is recorded and the track T₁In the lap
Wave number f₁The pilot signal of the track T_ThreeHas the frequency f_Threeof
The pilot signals are respectively superimposed and recorded. Ma
Every other track T by the other rotary head HB_Two, T
_FourAre sequentially formed and the FM-modulated video signal is recorded
Track T with_TwoHas the frequency f_TwoThe pilot signal of
Track T_FourHas the frequency f_FourThe pilot signals of
It is recorded superimposed. And this truck
T₁~ T_FourAre recorded repeatedly, so that four types of frequencies
The number of pilot signals is also these tracks T₁~ T_FourTo
It is recorded cyclically.   Tracking control during playback is performed as follows.
You.   In this case, head HA is track T₁And T_ThreeScan correctly
When the head is in just-tracking state
HB Truck T_TwoAnd T_FourWhen scanning correctly is just
Tracking state. Therefore, head HA and
HB gap width assumed to be equal to track width
If heads HA and HB are on track T₁~ T_FourWhen scanning sequentially
Synchronously with this, the frequency becomes the reference pilot signal.
f₁~ F_FourSignal P₁~ P_FourTo the multiplication circuit,
When the frequency difference from the cut signal is detected, the just track
No frequency difference can be obtained in the state of ringing.   On the other hand, the tracking position is the head position in FIG.
(This is for head HA) As shown in (1) and (2)
The reference pilot from the next track.
Pilot signal of a frequency different from the
Between the crosstalk signal
A frequency difference occurs and is proportional to the amount by which the level deviates
You.   So track T₁And T_ThreeAnd T_TwoAnd T_FourIn the direction of deviation
Frequency f so that the above frequency difference is the same.₁~ F_FourTo
Tracking servo can be easily performed by selecting
Become like That is,   Δf_A= | F₁−f_Two| = | F_Three−f_Four|   Δf_B= | F_Two−f_Three| = | F_Four−f₁| So that In this way, the frequency difference Δf_Aof
Existence shifts right for head HA, head HB
Means left shift, frequency difference Δf_BPresence of head HA
Means left shift and head HB right shift.
And the difference Δf_AAnd Δf_BLevel is proportional to the amount of deviation
It becomes   Therefore, in principle, these frequency differences Δf_A, f_BBut
Indicates the amount of king error, and controls this to be zero.
Just tracking can be used.   Actually, just as shown by the solid line (3)
Both sides of the original track to be scanned even in the racking state
Crosstalk from the pilot signal
Frequency difference Δf_AAnd Δf_BWhen the levels are equal
And the difference Δf_AAnd Δf_BNo level
The tracking control by controlling the difference to zero.
Things.   Note that in the case of 8 mm video, the pilot signal is
The signal is even lower than the band of the
Frequency f₁, f_Two, f_Three, f_FourIs, for example, f₁= 102kHz, F_Two= 116kH
z, f_Three= 160kHz, f_Four= 146kHz, Δf_A= 14kHz, Δf
_B= 44kHz.   By the way, in playback on VTR, after normal playback
Use the brake to perform still playback or normal playback.
The raw state and the still playback state are repeated, and both
Slow playback by changing the time ratio of the live period
Is known.   In other words, this variable speed reproduction system is, as shown in FIG.
Same as head HA near head HB, in addition to head HA and HB
Azimuth head HA 'is provided.
The regeneration is performed by HA and HA '. Also
Of course, in normal playback state, playback starts from heads HA and HB.
To gain strength.   For example, during the first one frame period, the heads HA and HB
-After playing the tape and sending the tape for one frame,
Stop the tape and stop the head for the next 4 frames
Perform still reproduction using HA and HA '.
If it returns, it will be in the state of 1/5 slow playback.   In this case, stop the tape from the normal playback state.
When the tape is stopped and set to the still state,
The track scanning position of the transfer head is a so-called noiseless
To the playback position. For this reason,
From the preset time of one frame period in the playback state.
Apply a fixed amount of braking to this noiseless still
The tape was controlled to stop at the position.   Here, the braking amount is the period during which the brake is applied
The constant amount of braking is generally the same
It means that the brake is applied for a certain period of time. D Problems to be solved by the invention   By the way, during still playback and intermittent feeding as described above,
In the still playback state when performing slow playback by
Means that the tracking servo loop by the ATF method is still
If it is also formed in the state, in the still state
The tracking position of the rotating head fluctuates
Therefore, make sure that the ATF control loop does not work in the still state.
Can be considered.   Therefore, still playback without noise or slow playback
To do this, rotate the rotating head at the stopped tape position.
Racking is a problem.   By the way, in the past, a certain amount of
Stop the tape at the noiseless still position.
, But correctly at the noiseless still position
ATF system during normal playback to stop the tape
Just tracking by the tracking servo of
It is necessary to be.   However, in the still state, the tracking support of the ATF method is used.
When the tape does not work,
Or ATF servo does not work, but intermittent slow re
When performing raw, this tape feed period is, for example, 1/5 slot.
-In playback, it is as short as one frame out of five,
Generally, ATF servos have a slow response, so tracking
Bo can not follow enough. Therefore, during slow playback,
There is a disadvantage that noise appears on the playback screen.   In addition, ATF tracking error (hereinafter ATF error)
Considering the dynamic range of
For example, in case of 8mm video, ATF error as shown in Fig. 8
ATF servo is activated when the voltage is between 1V and 3.8V
ATF error during just tracking
-Voltage is this median E₀Is set to
The pressure becomes as shown by the solid line (4).   However, head variations, temperature characteristics, and mechanical loads
Fluctuations (eg difference between tape top and tape end)
Therefore, the ATF error during just tracking is
Fluctuating from the median as shown by the solid line (5) in FIG.
And the value E₁Becomes When this happens, the dynamic lens
Is virtually very narrow and ATF errors are dynamic
You may be out of range.   If this happens, is the ATF servo responding slowly?
Stop with a certain amount of brake to perform still playback
Tracking that is completely off the noiseless position
The tape stops at the position, and normal playback is resumed from this state
ATF error reduces the dynamic range
The tracking servo will not work with it off,
Noise appears on the playback screen.   The present invention has been made in view of the above problems, and has been developed.
The purpose is to perform still playback or intermittent transmission.
When performing slow playback, especially in the normal playback state
When you stop the tape from
Normal regeneration of the amount of brake applied to the capstan motor
Can be made variable based on ATF error in state
The ATF error is out of the dynamic range
Avoid the inconvenience of constantly appearing noise in raw images
And still playback at the noiseless still position.
To provide a playback device that can perform the playback. E Means to solve the problem   The present invention uses a rotating head as an oblique track.
The information signal is recorded and the information signal track
In addition, pilots with different frequencies are sequentially circulated for each track.
Information signal from a recording medium on which
In a playback device that plays back a signal,
Pilot signal detection for detecting the above pilot signal
Circuit and multiple normal pilot signals with different frequencies
A pilot signal generating circuit that outputs the signal cyclically;
The reproduced pilot signal from the lot signal detection circuit
The above regular output cyclically output from the pilot signal generation circuit
Tracking error signal based on the pilot signal
A tracking error signal generation circuit to generate, and the above recording
After transporting the media at the same speed as when recording and playing it back,
To stop the recording medium and perform playback.
Activated when the recording medium is transported, and
The pulse width is long according to the advance amount of the
The pulse width is short according to the delay amount of the tracking error signal
Brake signal generation to generate a locked brake signal
Circuit and the brake from the brake signal generation circuit
The amount of braking corresponding to the pulse width of the signal
Brake to stop the recording medium by applying a brake.
Key application means, activated when the recording medium is stopped,
The pilot signal output from the pilot signal generation circuit
Signal is switched in a time-division manner during one field period.
The tracking error signal has extremal signals of different polarities.
Pilot signal switching means for inserting a signal component,
Activated when the recording medium is stopped, and
Based on the extreme value signal component inserted in the
Control means for controlling a capstan motor
Are provided. F action   In the reproducing apparatus according to the present invention, first, the recording medium
The pilot signal recorded in the
, And the detected reproduced pilot signal and
The above cyclically output from the pilot signal generation circuit
Subsequent tracking based on the legitimate pilot signal
The tracking error signal is generated in the error signal generation circuit.
Generated.   Then, transfer the recording medium at the same speed as when recording and play back
After applying the brake, stop the recording medium and
When the recording medium is transported during production, a brake signal
The generation circuit is activated and the tracking error signal generation
Pal according to the amount of advance of the tracking error signal from the road
The tracking error signal delay amount.
A brake signal with a short pulse width is generated
You. This brake signal is supplied to the subsequent brake application means
The brake applying means supplies the recording medium with
With the braking amount according to the pulse width of the supplied brake signal
The brake is applied to stop the recording medium.   Tracks obtained during normal speed transport of recording media
The amount of advance and delay of the king error signal is tracked
Generally corresponds to the shift amount and the shift direction. Therefore, this
As can be seen, the amount of advance and delay of the tracking error signal
Variable amount of brake applied to recording media according to amount
When the recording medium is stopped, the magnetic head
To the noiseless still position.   When the recording medium stops, the pilot signal
The switching means and the capstan control means are activated, and
The pilot signal is generated by the pilot switching means.
The pilot signal output from the raw circuit is one field period
Switching in a time-division manner
-Extreme signal components with different polarities are inserted into the signal.
You. Then, the capstan control means at the subsequent stage provides
The extreme value signal component inserted in the racking error signal
The capstan motor is controlled based on this.   This capstan motor controls still playback.
The position of the magnetic head at the time of the noiseless still position
It is possible to go. In other words, still reproduction
It can be performed at the stills position and can be used for long periods of time.
Reproduction can be realized. G Example G₁Description of the configuration of the tracking control unit   FIG. 1 shows an example of a tracking control unit of the device of the present invention.
It is shown.   In the figure, (6) is a tape, which is a capstan.
State sandwiched between (7) and pinch roller (8)
The capstan motor (9) is driven by the
(7) transported in the direction of the arrow by rotation
It is.   Capstan motor (9) is capstan drive
Driven by the drive signal from the road (10). cap
Stan drive circuit (10) is the microcomputer processing part (100)
Capstan on signal ON and forward reverse direction
The signal FW / RV is supplied. ON signal ON is capstan
It becomes "1" only during the period for driving (7). On the other hand, the signal FW
/ RV drives the tape (6) in the forward direction
"0" when driving the capstan (7)
When driving in the reverse (reverse) direction, it becomes “1”.
You.   Therefore, the ON signal is turned ON from the stop state of the tape (6).
Is "1" and the signal (FW / RV) is "0", the tape (6)
Sent in the forward direction, if signal FW / RV is "1",
Sent in the berth direction. However, the tape (6)
(When signal ON is “1”, signal
FW / RV is “0”) When the signal FW / RV changes from “0” to “1”
This is for the capstan motor in the forward direction.
Tape (6) also reverses
Direction (signal ON is “1”, signal FW / R
V is "1"), and when the signal FW / RV changes from "1" to "0",
This is the reverse direction of the capstan motor (9).
Work as a brake.   Next, the ATF servo system will be described.   That is, the reproduction output of the head HA is output from the head amplifier (11
It is supplied to the switch circuit (12) via A).   The playback output of heads HB and HA '
The switch circuit (1) is connected via the amplifiers (11B) and (11A ').
3) supplied to. This switch circuit (13) is a microcomputer
Normal reproduction by mode signal MO from processing unit (100)
At the time, the playback output from the head HB is taken out and during still playback
Switches to take out the playback output from head HA '
Is performed.   The output signal from this switch circuit (13) is
Route (12). And this switch circuit (1
2) Rotation of heads HA and HB by head switching signal RFSW
Synchronized with phase, every half rotation (one field of video signal)
Alternately select the signal supplied to one and the other input
Is controlled as follows. Therefore, this switch circuit
The output of (12) is head HA and HB or head HA
And the signal of the state where the playback output of HA 'is continuously connected
This is supplied to the reproduction signal processing system.   The output of the switch circuit (12) is
The pilot signal is supplied to the
Is extracted. The playback path from this low-pass filter (21)
The pilot signal is supplied to a multiplication circuit (22).   On the other hand, a pilot signal generation circuit (23) is provided.
Frequency f₁, f_Two, f_Three, f_FourThe reference pilot signal P₁,
P_Two, P_Three, P_FourAnd these are supplied to the switch circuit (24).
It is. This switch circuit (24) has a microcomputer processing unit (10
0) is supplied, and this cell is
Of the pilot signals of four different frequencies
One of them is selectively taken from this switch circuit (24).
Will be issued. Head switching for microcomputer processing unit (100)
The signal RFSW is supplied, and the rising of this signal RFSW and
At the falling point, the select signal SL changes and the switch
The reference pilot signal obtained from the route (24) is changed
To be.   For example, during normal playback, heads HA and HB₁
~ T_FourThis switch control is applied during the 180 °
From the control circuit (24), the frequency is used as the reference pilot signal.
f₁, f_Four, f_Three, f_TwoReference pilot signal P₁, P_Four, P_Three, P_TwoTurns off sequentially
It can be obtained by being replaced.   Reference pilot signal from this switch circuit (24)
Is supplied to the multiplication circuit (22). Therefore, this multiplication
From the circuit (22), the reference pilot signal and the reproduced pilot signal
Signal difference frequency Δf_AAnd Δf_BSignal is obtained.
Are based on bandpass filters (25) and (26), respectively.
And detected by detection circuits (27) and (28), respectively.
The signals are detected and output as DC level outputs SA and SB. here
And the gains of the band-pass filters (25) and (26) are
It is intended to be equal. Detection circuit
The detection outputs SA and SB in (27) and (28) are
Number Δf_AAnd Δf_BOf the component of the
Large pilot signal included as crosstalk in the signal
The level is proportional to the size, and the right and left adjacent tracks
Tracking amount.   These detection outputs SA and SB are supplied to a subtraction circuit (29).
Thus, the subtraction output SD of both is obtained from this. This reduction calculation
The force SD indicates that the tracking position of the rotating head is just
It is more shifted to the left or right side with respect to the king position
This is a signal indicating the AFT error.   This ATF error is supplied to the adding circuit (30),
After the capstan is added to the speed error, the capstan
Capstan motor (9) via drive circuit (10)
And the tracking servo is applied.   The reference pilot signal from the switch circuit (24)
The frequency f₁→ f_Two→ f_Three→ f_Four→ f₁F without changing cyclically with ‥‥₁
→ f_Four→ f_Three→ f_Two→ f₁F_FourAnd f_TwoSwap with
The frequency difference Δf_AAnd Δf_BAnd the head HA
The direction of misalignment is reversed between when scanning the head and when scanning the head HB.
Because it is.   Then, the ATF error is also detected by the comparison circuits (31) and (3).
2) are supplied to the respective reference values E₁And E_TwoCompared with
It is. In the case of this example, the reference value E in the comparison circuit (31)₁
Is the upper limit of the dynamic range of ATF error, for example, 3.8V
And the reference value E in the comparison circuit (32)_TwoIs like
The lower limit of the dynamic range of the ATF error is 1.0V
You. The reference value E is obtained from the comparison circuit (31).₁AT = 3.8V
Output C changes from "0" to "1" when F error is exceeded₁Get
The reference value E is obtained from the comparison circuit (32)._Two= ATF than 1.0V
Output C changes from "0" to "1" when the error becomes low_TwoGet
Can be   The output C of these comparison circuits (31) and (32)₁And C_TwoIs
It is supplied to the sampling circuits (33) and (34). on the other hand,
Formed based on switching signal RFSW from microcomputer processing unit (100)
Generated sampling pulse SP₁This sampling time
Output C supplied to roads (33) and (34)₁And C_TwoIs a sump
Ringed. This sampling is performed during still playback and
-During playback, the tape stops from the normal playback state.
Before normal playback, especially when the normal playback time is short.
Also, the tape rises from the stopped state to the normal playback speed.
Until the tracking is not stable,
As long as the tracking position will be stable
This is to extract the ATF error in the system.   The sampling circuits (33) and (34) thus obtained
Output D₁, D_TwoIs supplied to the microcomputer processing unit (100),
During normal playback or intermittent slow playback, normal
The amount of braking to stop the tape being played
Used for   That is, as described above, this microcomputer processing unit (10
From 0), the capstan on signal is turned on and the forward
Source direction signal FW / RV, but capstan on signal
Forward when signal ON is “1” and direction signal FW / RV is “0”
Direction signal FW / RV during normal feed in
This direction signal FW / R when setting the brake to "1"
This is for controlling the length of the period of “1” of V. G_TwoExplanation of the operation during slow playback   For example, Fig. 2 shows the time for 1 / 5x slow playback.
In the chart, FIG. A shows a head switching signal RFSW, and FIG.
The capstan ON signal is ON, and FIG. C is the direction signal FW / RV.
You. That is, for one frame period from the stop state, the ON signal
Set ON to “1” and direction signal FW / RV to “0”
During this one frame period, the heads HA and HB
Perform playback. And one frame of this normal reproduction
At the end of the period, the direction signal FW / RV is set to "1".
Ascends, brakes and tape stops. Soshi
This tape is stopped (signal ON and signal FW / RV
Are both “0”) for 4 consecutive frames.
Still reproduction is performed by the pads HA and HA '.   One frame after the still reproduction of the four frames is turned on again.
The ON signal turns to "1" and the tape is sent
It is in a raw state, and during one frame period of this normal reproduction
At the end signal FW / RV becomes "1" and brake
And the tape stops. Below, still playback 4 frames
And normal playback 1 frame are alternately repeated
1/5 speed slow playback is performed.   Then, in this case, the normal reproduction 1
Tracking before braking during the frame period
At the point where it will be stable, the sampling pulse SP₁
(FIG. 2D) shows that the ATF error during normal reproduction
Comparison output C of comparison circuits (31) and (32)₁And C_TwoIs a sump
Signal and the signal FW / RV
The length of the period in which it is "1", that is, the amount of braking
So that the tape stops at the noiseless still position
Controlled. Or at least, if the ATF error
The brake amount is controlled so that it does not deviate from the
You.   FIG. 3 is a block diagram of the microcomputer processing unit (100) at this time.
In the flowchart for rake control, first step
In [101], the comparison output C of the comparison circuits (31) and (32)₁Passing
And C_TwoSampling data D₁And D_TwoIs taken in. Next
In step [102], the comparison output C₁Sampling data
Data D₁Is “0”, that is, 3.8V or less
Is determined.   If it is 3.8V or less, proceed to step [103], and compare output C
_TwoSampling data D_TwoWhether or not is "0"
That is, it is determined whether the voltage is 1.0 V or more. And 1.0V or less
Above, the ATF error is within the dynamic range.
In this case, the process proceeds to step [104], where the signal FW / RV is
The pulse width of "1" is equal to a predetermined normal value set in advance.
Is done.   On the other hand, in step [102], the ATF error is
When it is determined that the tracking is shifted in the advance direction
In this case, go to step [105].
And the pulse width at which the signal FW / RV becomes "1" is longer than the normal value
As a result, the braking amount is increased.   Also, the ATF error is less than 1.0V in step [103]
When the tracking position is determined to be
And the process proceeds to step [106], where the signal F
The pulse width of W / RV is shortened and the amount of braking is reduced.
Or it is set to zero so that the brake is not applied.   By the above operation, at least ATF during normal playback
Errors do not deviate from the dynamic range
Noiseless by the ATF servo during normal playback.
It stops at the chill position.   Note that, of course, the ATF error
Is less than 3.8V, more than 1.0V and less than dynamic range.
If it is within the ATF error size,
By changing the amount of braking according to the size of the
The tape stop position is faster than the noiseless still playback position
Control.   Note that the above example shows the tracking position during still playback.
The correction is not performed at all.
Tracking position correction during chill playback can be performed.
You.   That is, FIG. 4 shows the tracking during the still reproduction.
FIG. 3C is an explanatory diagram of the position correction.
A and B in FIG.
If the position is later than the still position,
Indicates that the position is ahead of the noiseless still position.
And the track T₁Play more mainly
This is where you get the output.   During normal playback, the head HA₁Scan
During one field period, the frequency is used as the reference pilot signal.
Number f₁To supply only the signal to the multiplier (22)
However, during the still playback, as shown by the dotted line in the figure.
Track T on both sides adjacent to_TwoAnd T_FourStraddling
Scans HA and HA '. And this truck T₁To
Adjacent track T_TwoAnd T_FourThe middle of the first half of the track scan
Position, and how far across the intermediate position in the second half
In the noiseless still position, the amount is the same.
On the other hand, the track T_TwoOr
Rack T_FourScan over more.   Therefore, it is necessary to monitor the ATF error during this still playback.
And the tracking position is known. However, normal playback
Frequency f during one field period₁Standard
If only the pilot signal is used, the
Since no significant change can be obtained, the tracings A to E in FIG.
As shown in the illustration of the locking position, the first half of the track scan
As a big error in the middle of the second half
Time-division of the reference pilot signal at the frequency
Switch from the microcomputer processing unit (100) to supply
Control the selection signal to the switch circuit (24). Figure
In the case of the example, the frequency f_FourBase
The quasi-pilot signal is used, and the frequency is
Number f_TwoIs used.   By doing so, the AT as the output of the subtraction circuit (29)
The F error depends on the tracking position, as shown in FIGS.
It becomes a waveform like the following.   Supply this ATF error to the Schmitt circuit (35).
The output SC is shown in FIGS. 4A to 4E, respectively.
Such an output is obtained.   Then, this output SC is scanned during one track scanning.
As shown by the arrow in the output SC waveform diagram,
In consideration of the point in time when the frequency of the
If sampling is performed by the sampling circuit (36),
Pull output is available at the noiseless still position (Fig. 4C).
Is [1010], at a slightly delayed position (Fig. 4) [0010],
In the later position (Fig. 4A) [0000],
In the advanced position (Fig. 4D) [1011], the advanced position
[1111] in the position (Fig. 4E), and
A 4-bit pattern signal corresponding to the racking position is obtained.
It is. Therefore, this 4-bit pattern signal is
The discrimination is made by the controller (100) and the tracking position is advanced.
Or control the capstan motor (9) in response to the delay
To correct the tracking position during still.
The sampling pulse to the sampling circuit (36)
SP_TwoIs supplied from the microcomputer processing unit (100).   Fig. 5 shows still playback at 1 / 5x speed slow playback described above.
Time when the tracking position is corrected during the period
When the tracking position is the delay position in the chart
Is only the capstan ON signal ON as shown in FIG. 5B.
Is set to "1" for a short period during the still playback period,
The tape (6) is transported in the forward direction and
When the docking position is the advance position,
As shown by the broken line in FIG. 5C, the signal FW / RV is also set to "1".
Transport in the reverse direction to compensate for the tracking position.
To correct it.   The above example is based on the case of 8 mm video.
As described above, the present invention employs ATF tracking control.
The present invention can be applied to all of the reproducing devices used. H Effect of the Invention   According to the present invention, when performing still playback or intermittent transmission
When performing slow playback in
To stop playback and enter the still playback mode.
The amount of brake applied to the stun motor is
Since the variable is changed by referring to the ATF error, the ATF error
Over the dynamic range,
Noise can be prevented from constantly appearing, and still
Can be performed at the noiseless still position.
is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of an embodiment of a main part of the device of the present invention, FIG.
5 to 5 are diagrams for explaining an example of the operation, FIG. 6 is a diagram showing an example of a recording track pattern, FIG. 7 is a diagram showing an example of a rotary head device, and FIG. FIG. 3 is an explanatory diagram of a dynamic range. (6) is a tape, (7) is a capstan, (9) is a capstan drive motor, and (10) is a capstan drive circuit.

Continuation of front page       (56) References JP-A-61-65676 (JP, A)                 JP-A-59-200590 (JP, A)                 JP-A-61-105982 (JP, A)                 JP-A-61-160863 (JP, A)                 JP-A-61-202357 (JP, A)                 JP-A-61-87485 (JP, A)                 JP-A-59-58650 (JP, A)

Claims (1)

(57) [Claims] A reproducing apparatus for recording an information signal as an oblique track by a rotating head and reproducing the information signal from a recording medium on which a pilot signal having a frequency which is cyclically different for each track is sequentially recorded in a frequency-multiplexed manner. A pilot signal detection circuit for detecting the pilot signal recorded on the recording medium; a pilot signal generation circuit for cyclically outputting a plurality of normal pilot signals having different frequencies; and a reproduction from the pilot signal detection circuit. A tracking error signal generation circuit for generating a tracking error signal based on a pilot signal and the normal pilot signal cyclically output from the pilot signal generation circuit; and transporting and reproducing the recording medium at the same speed as recording. And then apply the brake to stop the recording medium It is activated when the recording medium is transported during reproduction and the pulse width is long according to the advance amount of the tracking error signal, and the pulse width is short according to the delay amount of the tracking error signal. A brake signal generating circuit for generating a brake signal; and a brake applying means for applying a brake to the recording medium with a brake amount corresponding to a pulse width of the brake signal from the brake signal generating circuit to stop the recording medium. A pilot signal which is activated when the recording medium is stopped and which is output from the pilot signal generation circuit is switched to a pilot signal corresponding to the frequency of an adjacent track in a time-division manner in one field period, and Pilot signal switching means for generating extremal signal components having different polarities from each other in a signal; A pattern signal generation circuit that is activated when the recording medium is stopped and generates a pattern signal based on the extreme value signal component included in the tracking error signal; code content of the pattern signal from the pattern signal generation circuit A capstan control means for controlling a capstan motor in accordance with the condition.