JPS6087455A - Tracking position control method of video tape recorder - Google Patents

Abstract

PURPOSE:To shift the tracking position with no addition of a DC offset signal by producing a reference signal from a signal obtained by delaying the head switching signal of each video head by a prescribed period of time and shifting the tracking position of each video head by the reference signal. CONSTITUTION:A conventional adder is excluded and a delay circuit 17 is provided to an input terminal 4 to delay a head switching signal (a) by a prescribed time DELTAT. This delayed signal is shown by (b), and the division signal of a dividing circuit 6 is equal to a signal obtained by giving 1/2 division to the delayed signal like (c). Furthermore the frequency switching of a reference signal given from a generator circuit is delayed by DELTAT. Then the output and error signals of an amplifier 11 are varied like (d) and (e) in case DELTAT=T/4. In this case, the average level of the error signals within a field period becomes negative as shown by a broken line of (e). A tape has a phase advance to eliminate a delay of the tape traveling phase. Thus the tracking positions of both heads has a shift by DELTAT in the advance direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to tracking positions of a video tape recorder using an automatic tracking method (ATF method) that controls the tracking position of each video head using an X11 pilot signal for each track of a video tape. Regarding the control method, an object of the present invention is to delay the head switching signal by a predetermined period of time to shift the tracking position of each video head when performing splicing, for example.

Conventionally, the self-assisted tracking method (A) uses pilot signals to control the tracking position of the video head.
TF format) video tape recorders, such as the V2O00 series video tape recorders manufactured by Philips Corporation and the video tape recorders proposed by the 8 Brain Video Conference, trace the tape using multiple rotating video heads that are wider than the track width of the video tape. At this time, the left and right 14 signals included in the reproduced pilot signal of each video head are
The tracking positions of the video heads are controlled so that the levels of the pilot signal components of the contact tracks are equalized, and each video head is controlled so as to trace the center of the track as shown in (Ha) in FIG.

The ATF video tape recorder has the advantage of eliminating the need for a tracking adjustment volume or the like of a video tape recorder that controls the tracking position of the video head using a control signal.

By the way, an ATF video tape recorder with two video heads has, for example, a
Together with the video signal, there are four pilot signals with different frequencies, that is, frequencies f0°f2. , f3. The pilot signal of f is repeated 11 times.

Note that each pilot signal has a frequency difference between frequencies f, , f2 and a decoy wave number f3 . f, the frequency difference is 16 KI-1
'Z, and the frequency f2. f, (f2(f4<f3) are set so that the frequency difference between f3 and the frequency f4°fl becomes 46KI-(z.

During reproduction, in order to control the tracking positions of both heads based on the reproduction pilot signals of both heads, the error signal forming section shown in FIG. The filter 121 extracts a reproduced pilot signal from the four raw signals, and the extracted reproduced pilot signal is input to the mixer circuit (3).

On the other hand, the 31st El (
As shown in a), when one head traces the tape, a low level σ-D signal is input, and when 4+110,000 heads trace the tape, a high level σ-D signal is input. The head cutter 4'k 4N is the reference signal generation circuit; 5) and the 1/2 section circuit (
6).

Furthermore, the 31st signal is generated from the frequency dividing circuit (6):
gl As shown in (b), a frequency-divided signal obtained by dividing the head switching signal by 1/2 is output.

Based on the 2-bit power control code formed by the head switch signal and the division signal of the frequency divider circuit (6), the generation circuit (5) generates a signal when both the head switch signal and the frequency division signal are at low level D. is the reference signal of 1 wave number f1,
When only the branch signal is at low level), use the reference signal of frequency f2, and when the head is switched off: only the Aoi Butsu signal is at low level, use the reference signal of frequency f3. When both are at a high level σ, a reference signal of frequency f4 is output to the mixer circuit (3).

Then, the mixer circuit (3) subtracts and mixes the reproduced pilot signal and the reference signal, and the output signal of the mixer circuit (3) passes through a 16 KH2 bandpass filter (7) and is input to the AM detection circuit (8). 461 (H
AM detection circuit α via the band pass filter (9) of
It is input to O.

Note that the generated frequency of the reproduced pilot signal input to the mixer circuit (3) is equal to the frequency of the reference signal, as shown in FIG. 3(c). Further, since the edges of both heads are wider than the width of each track, the reproduced pilot signal includes subcomponents of frequencies on both sides of the frequency of the main component.

Then, as the tracking positions of both heads shift, the levels of the output 1g of both transverse wave circuits f81 and Ql are different, and the output signal of both transverse wave circuits (8) and αυ is input to the differential amplifier III. The output signal becomes a signal with a positive or negative level depending on the amount of deviation of the tracking position.

Furthermore, the output signal of the differential amplifier C is input to one contact (a) of the switch (121) and the inverter (131) that inverts the polarity of the output signal, and the output signal of the inverter (13) is It is input to the middle contact (b) of the switch (121).

Note that the switch (121) is switched and controlled by the head off → Aoi signal, and when tracing one head, the contact (
In a), when tracing the sacral head, the adder is switched to the contact point (b) and connected to the switching piece of the switch 112)! The signals of both contacts (a) and (b) are alternatively input to I4).

By the way, the adder (14) is selectively inputted with an offset signal of DC A volt from an offset signal input terminal (15) in order to perform an offset described later.

Then, the adder (14) outputs an error signal obtained by adding an offset signal to the signal at the contact (a) or (b) to the error signal output terminal (16), and outputs both signals based on the error signal at the output terminal (1G). Head tracking Jl,l
°rlt is controlled by iti.

By the way, during normal playback, both heads are set to 'M 1 +z+
to the optimal tracking position (Ha)? WIl to, the offset signal is not input to the adder] 4), and the error signal of the output Aiko (10) is formed by the signal at contact (a) or (b), and at this time, it is not included in the regenerated pilot signal. The tracking positions of both heads are adjusted so that the pilot signal components of the adjacent tracks that are tracked are equal and the error signal becomes 0.

During normal playback, both heads are controlled to be at the tracking position (Ha) based on the above-mentioned error signal.
When transitioning from playback to recording, both heads are in the first position.
If it is shifted from the position (Ha) in the figure to the left sacrum l, that is, in the delay direction, the tape will move from the recorded area (rage) to the unrecorded area (
When recording is performed on the first track after transitioning to BLK, the recording area of the track becomes extremely narrow.

Therefore, in the past, the above-mentioned offset signal was input to the adder 5 L141 to determine the tracking position of both heads as shown in FIG.
As shown in Hb), (Hc), and (Hd), the left side of the head is shifted in the advancing direction by an amount of false so that it is located at the boundary of the track, thereby preventing the recording area from becoming narrower.

Note that T indicates one song in one field in which the head switching signal is at a high level σ' or a low level (G).

However, in the first case, in order to shift the tracking positions of both heads, it is necessary to provide an offset signal output circuit for forming and outputting an offset signal, and it is also necessary to adjust the offset signal output circuit for each set. It is necessary to do it.

This invention has been made with the above points in mind,
Each track of the tape is played back by a plurality of video heads having a width wider than the video track width of the video tape, and each track of the tape is reproduced based on a reference signal formed from a playback pilot signal of each track and a head switching signal. fli the tracking position of the video head
14. A method for controlling a tracking position of a video tape recorder for controlling a video tape recorder, characterized in that the tracking position of each of the video heads is shifted by delaying the head off signal of each of the video heads by a predetermined time. A tracking position control method for a tape recorder is provided.

Therefore, according to the tracking position control method for a video tape recorder of the present invention, in order to smooth the tracking position of each video head by delaying the head switching signal for forming a reference signal, a DC offset signal is used as in the conventional method. You can easily shift the tracking position of each video head without adding anything. For example, in order to perform linking, the tracking positions of both heads can be shifted from the positions (Hb) to (Hd) in Figure 1. It is possible to prevent the recording area from becoming narrower due to the shift.

At this point, this invention will be explained in detail with reference to the drawings from FIG.

In Fig. 4, the same symbols as in Fig. 2 indicate the same or equivalent elements, and the difference is that instead of omitting the adder 114) in Fig. 2, the head switching signal is delayed by a predetermined time ΔT to the input terminal (4). This is because a delay circuit (lη) is provided.

The continuous feed signal output from the delay circuit (1η) to the generation circuit (5) and the frequency dividing circuit (6) is a signal obtained by delaying the head switching signal in (a) by ΔT, as shown in 451g+(b). The frequency-divided signal output from the frequency dividing circuit (6) becomes a signal obtained by dividing the frequency of the delayed signal by 172, as shown in FIG.

Furthermore, lEu is generated based on the delayed signal and the frequency-divided signal.
Since the frequency switching of the reference signal output from the circuit 6) is delayed by ΔT, the output signal between the amplifiers and the error signal change as shown in FIGS. 5(d) and (e). Since the average level of the error signal during the field period '1' decreases, the tracking positions of both heads are shifted in the delay direction by ΔT.

Incidentally, the amount of delay caused by the delay circuit 0'iI can be reduced by, for example, a software technique such as a control microcomputer.

If ΔT = Ill/4 is set, then the error signal changes as shown by the broken line in FIG. 6, with a delay of T/4 after reaching the point of ΔT-0 shown by the solid line in the same figure. The tracking positions of both heads are shifted by T/4 in the delay direction.

Furthermore, the tracking position of both heads is ΔT = T, /
When the delay is delayed by 4, the head traces of both heads are shifted by ΔT compared to when there is no shift, as shown by the broken line in FIG. changes with a delay.

Incidentally, FIG. 7 shows a head trace using a known track pattern coordinate method, where the vertical axis shows the tape running distance and the horizontal axis shows time. Also, ■, ■, ■ in the figure
, ■ are frequencies f□, f2. The tracks in which the pilot signals of f3 and f4 are recorded are shown, respectively, and the arrows show the tracing directions of both heads.

By the way, if ΔT=4T-T/4, the error signal changes as shown by the dashed line in FIG. 6, and at this time, ΔT
= -T/4, that is, the tracking position changes as if it advances by T/4, so the tracking position is T/4.
This means that the tracking position of both heads is shifted by 4 in the advancing direction, and the tracking position of both heads is at position ii (Hb) ~ in Fig. 1.
(Hd). Note that +Vm and -Vm in the figure indicate the maximum positive and negative levels of the error signal.

Therefore, when performing splicing, the delay circuit Q
By delaying the head switching signal by ΔT=2T-T4:' using 71, the positional forces of both heads are brought to the positions (Hb) to (Hd) in Figure 1, and the head switching is performed without adding an offset signal. By delaying the signal by ΔT, it is possible to prevent the recording area from becoming narrower.

It is of course possible to shift the positions of both heads to arbitrary positions other than the positions (Hb) to (Hd) by changing ΔT.

Then, in order to form the head switching signal with a delay, the g
It is possible to simply shift the tracking positions of both video heads by a set amount without performing step t.

Further, in the above embodiment, the delay amount of the delay circuit (17) was set under the control of the i+l control microcomputer to delay the head switching signal. It is also possible to delay the head switching signal through processing, and in this case, the configuration can be simplified.

By the way, in the case of the above embodiment, the error signal is as shown in FIG.
As shown in e), since the level changes in one field period T, the error signal changes in pulses during the tracking position 6 control period. Since this may occur, the tracking positions of both heads may be controlled by converting the error signal into a direct current using a low-pass filter, for example.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of head tracing, Figure 2 is a circuit block diagram of a conventional tracking position control method for a video tape recorder, Figures 3 (al to (C) are timing charts for explaining the operation of Figure 21, The following drawings show an embodiment of the tracking position control method for a video tape recorder according to the present invention, and FIG. 4 is a circuit block diagram, and FIGS.
(f) is a timing chart for explaining the operation of FIG.
The figure is a waveform diagram of an error signal, and FIG. 7 is an explanatory diagram of head tracing. 12+, (7), (9)...filter, (3
)...mixer circuit, (6)...reference signal generation 16.1 path, (6)...branch circuit, (8). Shout...Detection circuit, tll+...Differential amplifier, (I2
1-Switch, (I3)... Inverter, (171...
delay circuit. Agent Patent Attorney Fuji 1) Ryutabe Kaku0"1"" ° - Ichino +++++ -no v ++ Written amendment for concavity procedure (voluntary) January 31, 1980 Commissioner of the Japan Patent Office 2 Name of the invention Video tape recorder Tracking position control method 3 Relationship with the case of the person making the correction Patent application Address 2-18 Keihan Hondori, Moriguchi City, Osaka Name
(188) Sanyo City Machinery Co., Ltd. Representative: Ryo Ie 4 Agent: 530 Description 1. Title of invention: Tracking position control method for video tape recorder. 2. Claims ■ Each track of the tape is played back by a plurality of video heads having a width wider than the video track width of the video tape, and a reference signal formed from a playback pilot signal of each track and a head VJm signal. Beg! A tracking position control method for a video tape recorder, which controls the tracking position of each video head by controlling the running phase of the tape based on the signal.
Delay the head cut signal of each video head by 1 at a predetermined time◇
]1. 71 ia The tracking position of a video tape recorder whose four characteristics are that the tracking position of each video head is made to be smooth: i + lJ l
l1t11 method. 3. Detailed Description of the Invention The present invention relates to a method for controlling the tracking position of a video tape recorder using an automatic tracking follow-up method (ATF method) for controlling the piking position of a valley track on a videotape. The object of this invention is to use a head switching signal to shift the tracking position of a head by a predetermined period of time. Conventionally, ATF type video tape recorders that use pilot signals to control the tracking position of the video head, such as the 2000 series video tape recorders manufactured by Philips Corporation and the video tape recorders proposed by the 8-Yo Video Association, have been designed with a cap length. The tape is traced by multiple rotating video heads that are, for example, 1.5 times wider than the track width of the video tape, and at this time, the level of the pilot signal component of the left and right adjacent tracks included in the reproduced pilot signal of each video head The tracking position of the video head is controlled by controlling the running of the tape so that the values are equal, and each video head is controlled to trace the center of the track as shown in (Ha) in FIG. This type of video recorder uses Control 1 to control the tracking position of the video head.
This has the advantage of eliminating the need for a tracking adjustment volume or the like in a video tape recorder that uses a control system. By the way, this 4 that connects to Tsukasa 211's video
A multi-layer video tape recorder, for example, transmits pilot signals of four frequencies with different frequency values, ie, frequencies 19f, , f2, f3, .
f, Pilot No. 100 is repeated 11 times. It should be noted that each pilot signal has a frequency difference of the temporary frequency f, , f2, a frequency IHt, a number f3 . f4 Noted wave error 161 (t-Iz, and frequency difference S of frequency f, f3 and frequency difference of frequency V f4゜f is 46 Kl(z
It is set such that f, < f2 < f4 < f3. During playback, the tracking positions of both heads are controlled based on the playback pilot signals of both heads.
The error signal forming section shown in Fig. 2 is provided, and the reproduced signals of both heads are inputted to the reproduced signal input terminal (1) (200K) (z low-pass filter (2), and filter) 21 converts the reproduced signal into a reproduced pilot signal. is extracted, and the extracted regenerated pilot signal or mixer circuit (3)
is input. On the other hand, the head switching signal input terminal (4) is as shown in Fig. 3(a).
As shown in , a head switching signal is input which is at a low level (L) when one head traces the tape and is at a high level when the other head traces the tape, and this head switching signal is input as a reference. Signal generation circuit (
5) and a single frequency divider circuit (6). Further, the frequency dividing circuit (6) outputs a frequency-divided signal obtained by dividing the head switching signal by one and two times as shown in FIG. 3 (bl) to each generation circuit (5). Based on the 2-bit +lI code formed by the head switching signal and the frequency division signal of the frequency division circuit (6), both the head switching signal and the frequency division signal are at low level (T). When only the branch signal is at low level (G), the reference signal at frequency f2 is used; when only the head switching signal is at low level (L), the reference signal at frequency f3 is used. s The cylinder and the branch signal are both No\IreherH
In this case, the reference number 1 of the frequency efa is output to the mixer 1 (3). Then, the mixer circuit (3) subtracts and mixes the reproduced pilot signal and the reference signal, and the output signal of the mixer circuit (3) passes through a 16KHz bandpass filter (7) and is sent to the AM detection circuit (8). As it is input, 46KH
Bandpass filter of z (01'f
It is input to the X detection circuit αO. Note that the generated frequency of regenerated pilot No. 15 inputted manually to the mixer circuit (3) is the same as the frequency of the reference signal, as shown in No. 31gl (C). It becomes a sad no wave number. Furthermore, since the width of both heads is wider than the width of each track, there is one component of a parrot at each frequency on both sides of the frequency of the main component in the reproduction pilot No. 1. Then, as the tracking positions of both heads deviate, the levels of the output signals of both transverse wave circuits (8) and the output signals differ, and the output signals of both transverse wave circuits (8) and αO are input to the differential amplifier II. ) has a positive or negative level depending on the amount of deviation of the tracking position. Further, the output signal of the differential width amplifier (11) is transmitted to the switch 11.
It is input to one contact (a) of 21 and an inverter (13) that inverts the polarity of the output signal, and the inverter 4t+3
) output one word is the switch (the other contact (b) of 121)
is input. The switch (121) is switched and controlled by the head switching signal, and when tracing one head, the contact (a)
When the other head is traced, it is switched to the contact (b), and the addition R connected to the switching piece of the switch (121) is switched to contact (b).
The signals of both contacts (a) and (b) are alternatively input to f+4). By the way, the adder (14) has an offset signal input terminal (1α from 151) in order to perform the offset described later.
The offset signal of Ryujin Bolt is selectively input. And the adder (14) is ・1 at the contact point (a) or (b)
An error signal obtained by selectively adding the offset 1e to the key is output to the error signal output terminal OGl, and the output terminal (16
) error signal or tape routing i:ill□'Ii
At that time, the tape running phase is adjusted by Raku's 11i111'itl, and the tracking position of both heads (4 is hill, al. The optimal tracking position ji [Ha) in Fig. 1, that is, the upper middle of the head
At position 1 where traces the center of the track, +! I u
gl, so the offset 1z is the addition 4 L1
41, the error signal at the output terminal (16) is formed by contact No. 1g of contact (a) or (b), and the pilot signal components of adjacent tracks included in this old reproduced pilot signal become equal, resulting in an error. No. 100 or OK IQ
The running of the tape is started at 1611, and the tracking positions of both heads are controlled. During normal playback, the tape runs iti! based on the error signal mentioned above. Although both heads are set at a tracking position of 1f (Ha) by I/O, for example, when splicing tapes, when transitioning from playback to recording, the positions of both heads are as shown in Figure 1. If it remains at the position (Ha), it will slide to the left side of the optimal recording position, that is, in the direction of delay, and the
When recording the first track from the unrecorded section (LEc) to the unrecorded section (BLK), the recording area of the last track of the recording section (REC) becomes very narrow. Therefore, conventionally, the aforementioned offset signal is input to the adder er'in+ to advance the tape running phase to adjust the tracking position of both heads by about 1 (Hb in FIG. 1). As shown in (Hc) and (Hd), the optimal position 1-1 when recording the tracking position by moving the head by 1/4 in the advancing direction so that the left end of the head is located at the track boundary.
to prevent the recording head from becoming too narrow. Note that T indicates one field period in which the head switching signal is at a high level or a low level (l K fA). However, the platform in Figure 1 forms and outputs an offset signal in order to shift the tracking positions of both heads. It is necessary to provide an offset signal output circuit, and it is also necessary to adjust the offset No. 4g output circuit for each set.The present invention has been made with the above points in mind.
Each track of the tape is reproduced by a plurality of video heads having a width wider than the video track width of the video tape, and based on the reference signal formed from the reproduction pilot signal of each track and the head switching signal as described in B. A tracking position device for a video tape recorder that controls the tracking position of each video head by blocking the tape running phase.
In the g1 method, head switching 1 of the valley video head
The reference I
Tracking of a video tape recorder ()' d 4811, characterized in that the tracking position of each of the video heads is shifted by forming a reference signal and advancing the regular phase of the tape using the reference signal.
41 methods are provided. Therefore, according to the tracking position control method for a video tape recorder of the present invention, a reference signal is delayed by a predetermined time in place of the delayed head switching signal, and the tape is run based on the reference signal. Because the tracking position of each video head is shifted by advancing the phase, for example, when splicing, the tape running phase can be advanced and shifted without adding a DC offset signal as in the past. Change the tracking position of both heads to the position (t b) to fl- in Figure 1.
Id), it is possible to prevent the recording area of the last track of the recording section (l(, EC) from becoming narrower). This will be explained in detail with reference to the drawings.In Fig. 4, the same symbols as in Fig. 2 indicate the same or equivalent parts, and the difference is that instead of omitting the addition 5+141 in Fig. 2, a head switching signal is input to the input terminal (4). The point is that a delay circuit Ilη is provided to delay the signal by a predetermined time ΔT.Then, the delay signal outputted from the delay circuit (lη to the generation circuit +51 and the frequency dividing circuit (6) is shown in 5th+*1(b). , the head switching signal in (a) of the same figure is delayed by ΔT, and the divided signal output from the frequency divider circuit (6) is delayed 1g by 1/2 as shown in (FC) of the same figure. It becomes a frequency-divided signal.Furthermore, since the frequency switching of the reference signal output from the generation circuit (6) based on the delay signal and the frequency divider No. 18 is delayed by ΔT, for example, in the case of ΔT-'r/4, Output/signal β and error IJ of booster 11 (11)
The numbers change as shown in Figures 5 (dl and (e)), and at this time, the average level of the error signal of the dark T in the first field period decreases from the O holt as shown by the broken line in the diagram (e). Since the tape becomes negative and the tape advances in order to eliminate the delay in the tape running phase, the tracking positions of both RADs shift in the advancing direction by ΔT.By the way, the delay time: 烙117) is as follows. For example, this can be controlled by a software method such as a control microcomputer. SoL TeAT=T/4 Kfffixedsuh,ha,il+'!
51gl (f) As shown in Figure 71, the frequency switching of the reference signal is ΔT = T/
At this time, the level of the error signal becomes a negative level as shown in Figure 1 (e), and the error signal characteristics become as shown in Section 1 of Figure 6. The tape running control circuit considers that the tracking positions of both heads are shifted by T/4 in the advancing direction in FIG. 1 compared to when the frequency switching of the reference signal is not delayed. Therefore, in order to reduce the level of the error signal to the 0 level shown in FIG. Slide in the direction shown in the diagram. Incidentally, FIG. 7 shows a head trace using a known track pattern coordinate method, in which the vertical axis represents the amount of tape travel and the horizontal axis represents time. Also, ■, ■, ■ in the figure
, ■ indicate the tracks in which pilot signals of frequencies f, , f, , f3°f4 are recorded, and arrows indicate the tracing directions of both heads. By the way, if ΔT is set to 4T-T/4, the error signal changes as shown at point 11 in Figure 6, and at this time ΔT
=-T/4, that is, the tracking position is T/4
is considered to be the same as the case where it shifts in the lag direction in Figure 1,
The running phase of the tape is controlled to be delayed by 1/4. Therefore, the tracking positions of both heads are shifted from the position (Ha) when the frequency switching of the reference signal is not delayed by T/4 to the positions (Hb) to (Hd).
become. Note that +Vm and -Vm in FIG. 6 are positive error signals. Indicates the maximum negative level. Therefore, when performing connection, the delay circuit Q
By forming the reference number 1g with a signal delayed by ΔT=T/4 from the head switching signal at step 71, the tape running phase advances by T/4 and the positions of both heads are at the positions shown in FIG. 14b) to (Hd), and without adding an offset signal, a reference signal is generated using a signal delayed by ΔT to the head switching signal, and the recording area after the recording section (l(EC)) is generated. By changing ΔT, it is of course possible to shift the positions of both heads to any i position other than the positions (Hb) to (I(d)). Since the reference signal is formed by a signal obtained by delaying the head switching signal, adjustments must be made for each set, as in the case of adding an offset No. 4g.
The tracking position of both video heads can be adjusted by a set amount. Still, the head switching signal is delayed by setting the delay amount of the delay circuit (171) by the control of the JJLJ wholesale microcomputer, or the delay circuit (1η
It is also possible to form a reference signal by delaying one head switching word by software processing of a microcomputer without providing a reference signal, and in this case, the configuration can be simplified. By the way, in the case of the implementation σ14, the error signal is the 51st
As illustrated in Fast speed・
In this case, there is a possibility that an error 1fflJI may occur, so for example, the error signal may be converted into a direct current using a low-pass filter to adjust the tracking position of both heads. 4. Brief explanation of the drawings Fig. 1 is a schematic diagram of head tracing, and Fig. 21 shows the tracking position of a conventional video tape recorder. Te control method No. 1 @ boot/y Igl, ・-g 31%l
(a) to (C) are timing charts for explaining the operation of Figure 2, and Figure 4 shows an implementation of the method for controlling the racking position of the video tape recorder of the present invention. Figure @4 is circuit block diagram 1, 5th
1-1 (a) to if) are timing charts for explaining the operation of g41-1, the 61st FI is a waveform diagram of error No. 1g, and Figure 7 is an explanatory diagram of head tracing. +21, +7+, (91・filter, (3)・
-・Mixer i, L! Circuit, (51-reference signal generation circuit, (6)... circuit circuit, (6). αO... transverse wave circuit, (111... difference!, 11J increase n+
) 4 devices, (12) switch, (13)...inverter,
Groan... slow ■E circuit. Agent Patent attorney Threat 1) 1゛11　r415Figure 1wJ5Figure-T-+S-T→ ←-■-11Figure 7

Claims (1)

[Claims] ■ Wider than the video track width of a videotape1. Each track of the tape is played back by a plurality of video heads having a width of N, and each video head is controlled based on a playback pilot signal of each track and a head switching signal force S or a fanless signal. A tracking position control method for a video tape recorder for controlling tracking positions, characterized in that a head switching signal for each of the video heads is delayed by a predetermined period of time to shift the tracking position of each of the video heads. A tracking position control method for a video tape recorder.