JPS5992425A - Video signal recorder - Google Patents

Abstract

PURPOSE:To obtain a signal which shows the track of the end part by recording in time division the 1st and 2nd pilot signals at the end part of the 1st information and shifting left or right the relation between the frequencies of the 2nd pilot signal and a reference pilot signal during composite photographing. CONSTITUTION:In a section Y4 corresponding to a joint track T4 at the end of the 1st information, a switch control circuit 41 transmits alternately pilot signals of frequencies f4 and f2 in time division through a switch circuit 17 in the form of a reference pilot signal S11 and records it to the track T4. The correct tracking is secured in a section having the same frequency as f1, f2 and f3 of a reproduced pilot signal S2 among the signals S11 in sections Y1-Y3. Thus the detection output S13 and S14 of a forming part 31 are set at level 0; while a left shift is produced in the sections having f2, f3 and f4. Then the outputs S13 and S14 rises alternately up to their peak levels. Therefore, the output S21 has the positive maximum value at a discriminating part 33. However, the f1 showing a right shift to the f2 of the signal S2 exists in a section T4. Thus the output S21 has the negative minimum value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording device, and in particular, to a recording medium having a plurality of pilots having different frequencies on recording tracks formed in parallel in a direction IiB across the running direction. The present invention is applied to an automatic track following method (hereinafter referred to as ATF method) image recording device in which a signal is recorded cyclically together with a video signal, and a pilot signal reproduced by a reproducing head is used to cause the reproducing head to track each track. It is suitable.

[Background technology and its problems]

Generally, an image recording device such as a video tape recorder (VT) is used.
R), when attempting to edit multiple pieces of image information, each with a video signal, so that they are consecutively repeated 11,114 times on one tape, the recording and pausing operations are repeated as necessary to separate each piece of recorded information into gaps. The timing of recording image information,
It is necessary to make sure that the conditions such as the recording order of the head tracking control signal are the same as those for continuous recording.If this is not done, the capstan servo system will not work properly at the joints of each recorded information during playback. This results in disturbances in servo operation and disturbances in playback.

Conventionally, in order to solve this problem, CTL pulses (control pulses) are applied to each track in the same direction as C1 and recorded along the running direction of the tape, and the CTL pulses used during playback are used to track the head. (CTL made like this)
In a racking control system, the first information is recorded and the editing device is paused, then the tape is rolled while counting CTL pulses for several fields, and then the device is set to playback mode. Then, the information with the ratio 1 is rewound, and the CTL pulses are counted and the CTL servo is applied while reproducing the information. When the head reaches a track with a predetermined number of fields at the tail end just before the head returns to the pause position, the device is put into recording mode and new second information is superimposed on the track at the tail end. By writing, the first information is recorded while being erased.

In practice, for example, after rewinding the tape by 15 fields, 1
The servo is applied to 3 fields, and the recording of the 2nd information is started by applying the 1st information of the remaining 2 fields. Here, for a few seconds after switching to the recording mode, the recording power level for the second information is set to the number (dB:
By increasing the number by about 3, it is possible to prevent the adverse effects of the unerased portion of overwriting from occurring.

In this way, in an editing device using the CTL (CTL) racking control method, by counting CTL pulses, the switching point of each mode of tape rewinding, playback, and recording can be determined from the recording track of the recorded first information. Therefore, it is possible to prevent servo disturbances and reproduction image disturbances at the joint between the first and second recorded information.

However, in an editing device using the racking control method (ATF), since CTL pulses are not recorded on the tape, it is not possible to easily know the actual tape rewind length, playback or recording length, and therefore the first If the timing of switching to recording mode fails when entering the playback mode after rewinding the information for a number of fields, the rewinding length is traced too far and neither the first nor the second information is recorded at the seam. There was also a possibility that blank areas would be created where no information was recorded, which could disrupt the image of the seam. Also, the frequency change of the pilot signal recorded in each track of the already recorded first information is 1+114, and! The change in the frequency of the pilot signal of the second information to be recorded on the Lr is not continuous, which may cause the tracking servo operation to be disturbed at the seam.

[Purpose of the invention]

In consideration of the above points, the present invention utilizes pilot signals recorded in each track of the first information to
information on the first signal without creating a blank space at the seam and without disturbing the sequence of changes in the frequency of the pilot signal j1.
The purpose of this paper is to propose a video signal recording device that is capable of continuously recording second information based on the first information.In this way, it is possible to obtain a signal that clearly represents the last track of the first information. This is how it was done.

[Summary of the invention]

In order to achieve such an object, in the present invention, a second pilot signal having a frequency different from the first pilot signal used for tracking servo is recorded in a time division manner on the last track of the first information, together with the first pilot signal used for tracking servo. At the time of continuous shooting, the relationship between the frequency of the second pilot signal and the frequency of the corresponding reference pilot signal is made to be in a left-shifted or right-shifted state.

[Embodiment] An embodiment in which the present invention is applied to an editing apparatus for an ATF type two-head helical scanning VTR will be described below in detail with reference to the drawings.

First, the operating principle of the ATF type tracking control device will be described with reference to FIGS. 1 to 3. That is, as shown in FIG. 1, this tracking control equipment receives a part of the signal 81 of the playback output of a rotating video head as a playback head and outputs it to a pilot signal detection circuit (1)K having a low-pass filter configuration, and outputs the signal 81 to a magnetic tape as a recording medium. Reproduction pylon No. 1 82 whose component is the reproduction output of the pilot signal recorded in
'f! : Then, this reproduced pilot signal S2 is given to the error signal forming circuit (3). Error signal formation circuit (3
) sends out a tracking error signal S3 formed under the control of the lock point control circuit (4).

On the tape (5), as shown in Fig. 2, there are, for example, four types of pilot signals f1 and f'2 with different frequencies.
・F3 and f4 are recorded together with the image stick 4
A set of video tracks TI, T2, T3, and T4 are formed diagonally in contact with X# so as to be repeated in a primary arrangement. Here, the shoulder width of the video head constituting the playback head (6) is selected to be approximately equal to the width of the tracks Tl~'■゛4, for example. 7 As shown by the solid line in Fig. 2, when the playback head (6) is correctly tracking the track that it is currently re-scanning (this is called the playback track), only the pilot signal recorded on the track is played back. As a result, only one type of pilot frequency component is included in the playback output, and on the other hand, when the playback head (6) is shifted to the right or left with respect to the track as shown in the illustration, the playback output is of one type. By also reproducing the pilot signal that is applied to the adjacent track on the right or left side of the track, the number of pilot frequency components included in the reproduced output becomes two types. The length corresponds to the opposing length of the reproducing head moving relative to the reproducing head.

However, the Ayaka numbers f1 to f4 of the four types of pilot signals
is selected as the lower III band of the color component converted to low frequency (600 to 700 CkHz), and in the circulating four tracks T1 to T4, for example, the odd-numbered track TI, the track on the right with T3 as the center. Noba 1
The frequency difference between 0 and Toy B, ΔfA, and the frequency difference between 1 and the left leg i's track signal, ΔfB
At the same time, the output number σtan rack i'2, right 11Qσ) with T4 as the center, is 1. ! The d wave number difference becomes ΔfB,
Moreover, the frequency difference between the 1ull track on the left (10t and σ) is set to ΔfA.

Therefore, the head (6) is on odd-numbered track T1. 'l'
3, the frequency difference force Δf is expressed as the frequency component of the Nokuirot signal included in the reproduced signal.A17)
(If there is an i component, it can be determined that the head (6) is in the writhing state.
When you know that the ui head (6) is in a left-handed state, and there is no frequency difference or signal components of ΔtA and ΔfB,
I can see if I'm being tracked correctly.

When the head (6) is reproducing the even-numbered track 'r2゜T4 with four balls, if there is a same wave number difference or the 46th component of ΔfB as a frequency component of the original signal carried by the reproduced signal, the head (6) 6), it can be determined that the head (6) is in a right-shifted state, and if there is a signal component force with a frequency difference of ΔfA, it can be determined that the head (6) is in a left-shifted state.

In this embodiment, the first. Section 2.43. 4th track TI, T2, T3, 'r41cX'lL'
'G41. I'm sorry.

The frequencies f1, f2 r f3, f4 are f t
-102Ckllz:].

f −116(kllz), f3= HiOCk
l17], f4= J4f'i[:kllz,:]
Therefore, the difference frequencies ΔfA and ΔIB are selected, Δ
fA=l'f1-f21=l f3-f41 =14[
kllz]・・・・・・・・・ (1) ΔfB-1f2'-f31=l f4-fll ~4
71 [kl+71... (2) is selected.

The reproduced signal S1 with internal medicine like this σ) obtained from the head (6) is given to the rotor (filter configuration σ)/'-40t signal detection circuit (1), and the pilot which is troughed by the reproduced signal S1 The signal is taken out and the signal is taken out, and the number S2 is the multiplication circuit (14).
given as. Go to Kakashi circuit (14) and go to the culvert 2σ.

The reference pilot signal 811 of the lock point control circuit 1 (4) is given as an input.

The lock point control circuit (4) is one of the two video heads connected to a pilot a generation circuit (16) that generates four kinds of pilot chest wave number outputs with frequencies f1 to t4, and a rotating drum (not shown). Head switching pulse RF that scans the tape and changes the logic level every time the head switches
-8W (FIG. 3A); and a switch circuit (17) receiving 8W (FIG. 3A). In this embodiment, the switch circuit (7) uses a quaternary counter circuit that counts each time the level of the head switching pulse HF-8W changes, and thus the first to fourth tracks are counted from this counter circuit. l'l〜T
1. The gate signals corresponding to tracks 1 to T4 are opened to open gate signals 11. l! As shown in FIG. 3B, the output of the pilot signal generating circuit (16) at the batch frequencies 1□ to t4 is sent out as the reference pilot number 811 from j111.

Note that the reference pilot signal 811 obtained at the output end of this switch circuit (17) is used as the signal 1 (18) during recording.
'i) is sent to the video head as a recording pilot signal through
The f4 pilot signal is given to the Ilt+ next video head to record on each track T1 to T4.

In this way, while the head (6) scans the tracks T1 to T4 of the first to fourth scans, the reproduced pilot signal S2 obtained at the output terminal of the pilot signal detection circuit (1) is applied to the reproduced track. By hanging the reference pilot signal 811 that is generated in synchronization with the reference pilot signal 811, when there is a tracking error, a signal component having a frequency difference between the frequency component included in the reproduced pilot signal S2 and the reference pilot signal 8110 frequency is eliminated. Multiplication output SL2
(In fact, the calculated output 812 also includes other signal components such as the sum frequency component). This multiplication output S1
2 is applied to first and second difference frequency detection circuits (2tl) and (21) each composed of a bandpass filter. The first difference frequency detection circuit (addition) has a multiplication output 81
2, the above (difference frequency ΔfAσ based on equation 11) ig3
When a component is included, it is extracted and converted into a direct current using the 111 path (22) for converting to 3 currents, which has a configuration of 1 ship/stream and 1 path, to obtain the first error detection signal 813 of the @nagashi bell. Similarly, the second difference frequency detection circuit (21) outputs the multiplication signal S1.
2 contains the differential wave number ΔfBσ) signal component power based on equation (2) above, extract this and convert it to a DC circuit (2
3), a second error detection signal 814 is obtained.

Here, the heads (6) are the first, second, third, and so on. Fourth track TI, T2. When trying to track T3, T4 (therefore the switch circuit (17)), as shown in FIG. 3B, each track TI, T2, T3,
Frequency or flr f2 at the timing corresponding to T4&'C
, f3. f40 reference pilot signal Sll is being sent out) If it is shifted to the right, the reproduction signal S1 of the head (6)
Fig. 30 shows the regenerated pilot signal S2 obtained based on
1, the frequencies f1 and f2. f2 and f3+ f
3 and '4 '' 4 and fl (10 pieces of Hg are included, and the multiplication output 812 is shown in Figure 3 D1.
As shown in , the difference frequency ΔfA (=f□~f2), Δf
B (= engineering 2 to f3), ΔfA (= f3 to f4), ΔfB
A signal containing (==i4 to f1) of 114 orders is generated.

On the other hand, if the head (6) is shifted to the left, the playback pattern (No.
It now includes the pilot signals f3 and f4σ,
Accordingly, the multiplication output 812 is calculated as shown in FIG.
), ΔfB (=f2-f3).

ΔfA (-f3 to f4)'&I-.

Thus, as shown in FIGS. 3E and F (for example (showing a 1 right shift state), the first and second error detection signals whose DC level rises from 0 every time the head (61) switches the running track. S13 and 814 can be obtained from the meandering circuits (22) and (e).

First and second error detection Ig No. 813 and S14&1
The l! As shown in Figure 3G, the first
And every time the second error detection signals 813 and 814 are obtained alternately, a subtraction output 815 that changes in an alternating current manner is obtained. This subtraction output 815 is a direct changeover switch circuit (2
A force is seen at the first input terminal a1 of the inverting circuit (2).
6), the polarity is inverted and applied to the second input terminal a2. The changeover switch circuit (25) is a head changeover pulse R.
F-8W causes the head (6) to move, for example, to odd-numbered track T1. When scanning T3, the switching operation is performed to the first input terminal al side, and in contrast, even-numbered tracks T2,
When scanning T4, it switches to the second input terminal a2,
In this way, as shown in FIG. 3H, when the head (6) is in the rightward deviation state, a positive DC level output 816 of a magnitude corresponding to the rightward deviation angle is obtained (on the other hand, when the head (6) is in the leftward deviation state, the DC level is The output 816 has a size corresponding to the left-shifted bud and has a negative polarity), and this is sent as a tracking error (m number S3) through the output amplification circuit (27) consisting of a DC amplifier.Incidentally, the head (6 ) is shifted to the right, for example, when the reproduced track is an odd numbered track T1.T3, a signal component of the difference frequency ΔfA appears at the output terminal of the multiplication circuit (14), so that the first difference frequency detection circuit (
20) The output from *lI is given to the subtraction circuit (24), and at this time, the changeover switch circuit (5) is switched to the first input terminal at side, so the tracking error signal S3 of the positive DC level is sent to the subtraction circuit (24). Send. On the other hand, if the playback track is the even numbered track T2. When T4, the multiplication circuit (14
) The signal component of the difference frequency ΔfB appears at the output terminal of the 20th difference frequency detection circuit (21) 11111
The output from the subtraction circuit (24) is given to the subtraction circuit (24), and since the changeover switch circuit (25) is switched to the second input terminal a2 at this time, the negative output of the subtraction circuit (24) is sent to the inversion circuit. At (26), the polarity is inverted and sent as a positive DC level tracking error signal S3.

Therefore, if this tracking error signal S3 is used as a correction signal in the phase servo circuit of a capstan servo loose, for example, and the tape running speed is corrected so that it becomes faster when it is positive and slows down when it is negative, the video head and the playback track can be The phase shift can be corrected, and thus correct tracking servo can be realized.

In the above principle configuration, the principle has been described assuming that when the head (6) correctly tracks each track, only a difference frequency component is generated at the output end of the hook L1 path (14), but in reality, this tracking state Also in the head reproduction signal S1, pilot signals of tracks adjacent to each other by 1M4F on the left and right sides are generated.

In other words, if a guard band is not actually provided between tracks during recording, the newly recorded track should be partially overlapped with the already recorded instantaneous track in the recording mode.
lffi I will record it next time. Therefore, in this case, the head (6
) is larger than the width of each track T1 to '1'4, so when tracking correctly, the head (6) will move to left side 1 and right side 11! K v4 Extrudes into adjacent track.

Therefore, since the head (6) reproduces the pilot signals of the tracks adjacent to the left and right sides, the error detection number 8 S13 and 514 (corresponding to the fi acid component) has a difference frequency corresponding to the length of this protrusion. E and F) in FIG. 3 are generated from the DC conversion circuits (22) and (L).

In addition, when a guard band is provided, the width of the head (6) becomes almost equal to the width of the track, but the pilot signal recorded on the track that momentarily contacts the left and right sides is detected as a crosstalk signal by the head (6). mixed into the raw signal. Therefore, the error detection signals 813 and 814 include a signal component of the red wave number corresponding to the crosstalk signal.

However, the pilot signal mixed into the reproduction output S1 of the head (6) from the adjacent track is processed by the multiplication circuit (1
4) are simultaneously generated as signal components of difference frequencies ΔfA and ΔfB, so that when error detection prime signals S13 and S14 are subtracted from each other in the subtraction circuit (24), they cancel each other out. Moreover, the head (6)
When the head (6) is tracking correctly, the head (6) is in a symmetrical position with respect to the tracks that momentarily contact the left and right sides, so the protrusion length of the head (6) is almost equal between the left and right sides, and the magnitude of crosstalk is also th left and right sides are equal, and the content of the subtracted output S15 is equivalent to the above case where the width of the head (6) is considered to be almost the same as the track width. Therefore, the tracking operation of the tracking control device depends on the head width. Due to the larger track width or due to crosstalk, there is no adverse effect of the signal components of the difference frequencies simultaneously arising from the adjacent tracks on both sides.

As shown in FIG. 4, the video signal recording apparatus according to the present invention includes a tracking error signal forming section (31), a pilot signal forming section (32), and a joint track determining section (33).

The tracking error signal forming section (31) is connected between the changeover switch circuit (25) and the output amplifier circuit (27) of the error signal forming circuit (3), as shown by assigning the same reference numerals to the corresponding parts as in FIG. The error signal forming circuit (3) in FIG.
).

Further, the joint track determination section (33) has a sample hold circuit (
:tb), and its sample and hold output signal 821
is applied to the non-inverting input terminal of a Schmitt circuit (36) consisting of an operational amplifier operating on hysteresis, and when this drops to a voltage level lower than the Schmitt voltage of the reference power supply (37) applied to the inverting input terminal, the logic rLJ level is reached. A joint track discrimination signal 822 that falls at the same time is sent out.

Here, the sample hold circuit (34) of the tracking error signal forming section (31) and the joint track discriminating section (3
The sample hold circuit (35) of 3) is connected to the output signal 823 of the sample control circuit (38) having a monomultiplyibrator configuration.
and Q output S24, respectively, to perform a sampling operation during their logic "H" level.

The sample control circuit (38) generates a time division signal 529 (eighth
The tracking error signal is set by the rising edge of each pulse in FIGS. The sample and hold circuit (34) of the formation section (31) performs a sampling operation, and in response to this, the sample and hold circuit (35) of the joint track determination section (33) performs a sampling operation in the section of logic rHJ of the time division signal 825.
is designed to perform sample operations.

In this embodiment, the last track when recording the first image signal is predetermined as the fourth track T4 as shown in FIG. When the head (6) scans this fourth track T4, the discriminating section (33) generates a joint track discriminating signal 82.
The second UJM1 is generated on the first track T1.
It is assumed that the 1J signal is recorded.

As in the case of FIG. 1, the pilot signal forming section (32) includes a pilot signal generating circuit (16) and a switch circuit (17) driven by a clock signal from a clock oscillator (40) composed of, for example, a crystal excavator. The reference pilot signal forming circuit (4) includes a reference pilot signal forming circuit (4). In this case, as shown in FIG. 6, the switch circuit (17) selects the frequency f1. f2. Pilot signals of f3° f4 are repeatedly sent out in that order.

The switch control circuit (41) is E18! Head switching pulse signal RF sent from the control circuit main body of the signal recording device
-8W, a recording/reproduction mode signal 826, and a pause mode signal 827. It sends out changing sequence signals A and B, and as shown in FIG.
3).

The time division signal generation circuit (39) is a clock oscillator (40)
The frequency of the clock signal 828 is divided to generate a time division signal 829 which is a pulse generated in synchronization with the head switching pulse RF-8W. In this embodiment, the time division signal 8
29 is the head (6) or the first head (6) as shown in FIG. Second.
Third. 4th track 'l'l, T2, 'll'
3.

Section Yl, Y2, Y3, Y4 scanning T4
(Head switching pulse RF-8W (Fig. 8B)
) is divided into three equal parts, and a pulse with a relatively narrow pulse width that rises at the trailing edge position of each trisected interval d is formed into a pulse with a relatively narrow pulse width. The duty ratio of the width is preset to a predetermined value.

This time division signal 829 is sent to a first two-man AND circuit (45) which receives as one input signal the recording-reproduction mode signal S26 which rises to the logic rHJ level in the reproduction mode in the time division drive circuit (42). This causes the stable mode time division signal 829 to pass through the AND circuit (45) and further through the OR circuit (46) to the operating condition signal 530 (FIG. 8C) to the sequence control logic circuit (43). Sent as . On the other hand, in the recording mode, when the recording/reproducing mode No. 11 826 falls to the logic rLJ level, no rumbling output is sent out from the AND circuit (45).

Further, the time division signal 829 is transmitted to the second two-person AND circuit (47
) as one input signal, and the other input signal as the seam track timing signal circuit (48).
A seam track timing signal s31 is provided.

As shown in FIG. 5, the seam track timing signal 831 is generated when the head (6) enters the pause mode in the interval w1 in which the first information is recorded, during the 4-cycle interval of the head switching pulse RF-8W. One of the predetermined sections, for example, a section in which a pilot signal of frequency f4 is to be recorded, is designated, and when the pause mode signal S27 is generated, the mono multivibrator (49) is operated and the signal shown in FIG.
A temporary stop state signal 832 having a rising edge interval longer than three cycles AIj of the head switching pulse RF-8W shown in FIG. A head switching pulse RF-SW is applied to the clock input terminal of this clip-flop circuit (culprit), and it is set by the first rise signal that occurs when the pause state signal s32 rises, and then It is reset by the first rising edge that occurs after the falling state signal S32 (
(D) in FIG. 9, the head switching pulse RF-8W is thus activated. Output 833 is given by the third two-person AND circuit (51).

On the other hand, the head 9J% Hals RF-8W is given as a clock signal to the promotion cycle circuit (52) having a D-flip 70 times ¥6 configuration. The way it comes out is the head switching pulse as-sw
The frequency at which the resistance level is changed in synchronization with the rising edge of the head switching pulse 534 (FIG. 9B) is formed, and this is applied to the two-man powered NOR circuit (53) together with the head switching pulse RF-8W. It will be done.

This two-manpower Noah circuit (5', 3) is the head switching pulse R.
F-8W and Tsutsumi head switching pulse 834 are both logic rL
In order to generate the rising f4 section designation signal 835 of the section in which the frequency is J (that is, the section Y4 in which the head (6) records the bi-lot signal of frequency f4), this is connected to the AND circuit (Fig. 9E). 51) as the other input signal.

Thus, the AND circuit (51) outputs the temporary stop state signal 833.
14 out of the sections where the logic rl(J) is the logic "rHJ".
generates a joint track timing signal 831 that becomes ``H'', and thus generates a time division 46 number 529 that occurs during this section.
(FIG. 9F) is passed through the AND circuit (47), and further through the OR circuit (46) to the sequence control logic circuit (43).
Output to.

During the recording mode, the sequence control logic circuit (43) generates two sequence signals A and B based on the recording-reproduction mode signal 826 in synchronization with the head switching pulse RF-8W, rLJ and rLj, as described above with respect to FIG. r
LJ and rHJ, rHJ and rl, J, rti
j and rl-IJ in the jl order, whereby the frequencies f, , f2 . f3
．． The pilot signal of f4 is sent out as a recording pilot signal 839 via the recording line (18).

When the sequence control logic circuit (43) switches from this memorization mode to the pause mode, it performs the above-mentioned process until the time division signal 529 (FIG. 9F) arrives from the time division drive circuit (42). By switching the sequence signals A and B in recording mode and in the order of colleagues, frequency f1.
f2. Send the f3 pilot signal. However, in the section Y4 of the subsequent joint track T4, the time division signal 529
(FIG. 9F) arrives, the section Y4 corresponding to the fourth track T4, which becomes a joint track, as shown in FIG. 10C.
When the time division signal 830 is logic rLJ, the sequence signals A and B are rHJ and rHJKI, and the frequency is f4.
When the time division signal S30 is logical rHJ, the sequence signals A and B are rLJ and rHJK to send out the pilot signal of frequency f2 as the recording pilot signal 839, and thus the frequency The pilot signals of f and f2 are alternately time-divided and sent out as a recorded pilot signal 839.

Further, the sequence control logic circuit (43) selects the reproduction pilot signal S'2 (FIG. 10C) or the head switching pulse RF based on the time division signal 830 continuously arriving from the reproduction mode time division drive circuit (42). -SW longest period interval Yl, Y2. Y3, the frequency f1. When reproducing the pilot signals of f2゜f3, the sequence signals A and B are jll['1st order (rLJ, rLJ and "L".

rH, J), (rL, J, rHJ and rHJ,
rLJ), (rfiJ.

rLJ and rHJ, rj month) and the circumference number f1 and f2゜f2 and f3. The tracking error signal forming unit (al) alternately switches the pilot HtW signals of f3 and f4 in a time-sharing manner and uses them as a reference pilot signal 811.
It is sent to the multiplication circuit (14) of
When the pilot signals of frequencies f4 and f2 are being reproduced alternately in a time-division manner, the sequence signals A and B are alternately reproduced in a time-division manner in synchronization with this ([January.

rHJ and rLJ 　LJ > and wave numbers f4 and f
The tool circuit (1) of the tracking error signal forming section (31) uses the pilot signal of
4).

Note that a low-pass filter (55) is installed at the output terminal 1 of the switch circuit (17) in order to remove harmonic components of the pilot signal so as not to cause an influence on the subsequent stage circuit.

In the above configuration, in recording mode, the video head (6
), the first . 2nd゜3rd. Fourth track TI, T2. T3, T4 are formed and recorded on the tape, and in synchronization with this, frequencies fl, f2 . f3. The recorded pilot signal S6, which changes cyclically in the order of
) through the video head (6) VC is sent along with the video signal to the corresponding track TI,'l'2゜'l''3.
Each is recorded in T4.

When the "pause" button is operated on the separate operation panel, a pause mode signal 827 arrives at the time division drive circuit (42), and the recording flow for the video head (6) is the first. The seam track at the end of the image information (
In this embodiment, this is maintained until the recording scan of the fourth track T4) is completed. At this time, the switch control circuit (
41) is the track TI, T2 as shown in FIG. 10C.
, T3 K corresponding section Yl.

Y2. In Y3, the frequency f1. f2. A pilot signal of f3 is sent out from the switch circuit (1i) and recorded by the head (6). Then, when the target section Y4 for track 1'4 arrives, the switch control circuit (41) operates the time division drive circuit (42) (Fig. 7) based on the timing signal S31 between the two points on the VC. The generated time-division signal 830 causes pilot signals of frequencies f and f2 to be sent out alternately and time-divisionally from the switch circuit (17) (FIG. 10C) and recorded on the last track T4 (fifth figure).

Thereafter, the tape is rewound by a predetermined field in rewind mode, and in this state the apparatus enters pause mode. Here, the amount of tape rewinding is, for example, 3 to 10, depending on the necessity.
The number of tracks may be arbitrarily selected, and the key is to be able to rewind a sufficient number of tracks to apply servo to the tracking servo system during the subsequent playback mode.

This pause mode is canceled when a "record" button is operated on a separate operation panel, and the mode becomes playback mode.

In this way, when the playback mode is entered, the time division drive circuit (42)
The continuous time division signal 82 is transmitted through the AND circuit (45) of
9 is given to the sequence control logic circuit (4:(), which allows pilot signals of two frequencies to be alternately and time-divisionally transmitted from the reswitch circuit (17) to the reference pilot signal 81.
1 (FIG. 10D). Here track T
I, T2. Ward I=Iyj corresponding to T3.

Y2. The reference pilot signal 811 at Y3 is the frequency gflf11f of the regenerated pilot signal 82 (FIG. 10C).
2. Section X1 having the same frequency I2 as f3, and truck T2 on the right side of the truck currently being re-scanned,
T3, frequency f2 assigned to '1'4
゜f3. It includes a section X2 having the same frequency as f4. Therefore, each section Y1. Y2. At Y3, frequencies f, , f2 . of the reproduced pilot signal S2 of the reference pilot signal 811 are determined. Section X with the same wave number as f3
1 is equivalent to correct tracking, so the tracking error signal forming section (31) (Fig. 4)
Detection output 81 of the difference frequency detection circuit (addition) and (21)
3 and 814 (FIG. 10 E and F) are at the 0 level, but at different frequencies f2. f3. Since the interval x2 with f is equivalent to a left-shifted state, the detection outputs 813 and 814 of the difference frequency detection circuits (S1) and (21) alternately rise to the peak level.

In this way, the outputs 813 and 814 of the difference frequency detection circuits (20) and (21) alternately rise in the positive direction in the form of pulses in each interval Yl, Y2, Y3, but this
Yl, Y2 . are subtracted from each other in the circuit (24). Y
A synthesized output 515 (Fig. 1O, G) is obtained, which alternately switches to stop or to the negative direction every 3 seconds, and the negative portion is further changed to the positive side by the changeover switch circuit (25) and the inversion circuit (26). An inverted output 516 (H in Figure 10) is obtained, and therefore the output 821 of the sample hold circuit (35) of the joint track discriminator (33) takes the maximum value of 1 on the positive side (Figure 10). .

However, section Y4 corresponds to the last joint track T4.
The reference pilot No. 18 811 in the section x1 has the same wave number as the frequency f4 of the pilot pilot signal S2.
This is similar to the other sections, but the time division section X2 existing in the first section has a frequency f1 representing a state equivalent to the right-hand deviation state with respect to the frequency f2 of the reproduced pilot signal S2.

Therefore, if we focus on this section Y4, the force will be different from that up to section Y3.
A pulse-like detection output 813 is obtained from the difference frequency detection circuit (3) of the difference frequency ΔfA (Fig. 10E).
) The pulse-like detection output 814 is no longer obtained from the difference frequency 4 number detection circuit (21) of the difference frequency ΔfB (FIG. 10F). Therefore, the output 815 of the subtraction circuit (24) does not alternately switch to the positive or negative direction, but a pulse-like output is output in the same positive direction as in the section ¥3 in section ruJY4, and this is converted to the changeover switch circuit (δ). By reversing the polarity of the seam track discriminator (, '(3
) will take the minimum value on the negative side (Fig. 10).

In this way, when the head (6) reaches the last joint track T4 where the first image 9I information is recorded, the sample hold circuit (35) of the joint track determination section (33)
)'s output 821 changes significantly from the maximum positive value to the minimum negative value. Thus, when the head is placed on the joint track T4, the level of the output 821 of the sample and hold circuit (35) becomes significantly lower than the O level and exceeds the reference pressure VR of the Schmitt circuit (36), thus making it possible to identify the joint track. The level of the output 822 changes from logic “L” to logic “H”
'', and this iodization is sent as a Me recording mode switching command signal.

At this time, the apparatus switches to the recording mode when the head (6) finishes running on the track T4 and reaches the end end ('J9) (FIG. 5). Thus, when the head (6) switches to the next track, the switch circuit (17) is applied to this track.
The recording of the first field of the second information is started with a pilot signal 839 of frequency f□ sent from the recording signal line (18).

Therefore, according to the configuration shown in FIG. 4, the first information that has already been assigned is adjacent to the last recorded track, and the second
Thus, there is no need to rely on the second information for the first information as in the conventional case, at the expense of the first information. It is possible to perform spliced shooting 9 without having to record any information, and without the risk of creating a blank track in which no information is recorded at the melting point.

When reproducing a tape recorded in this manner, no inconvenience occurs in the tracking servo operation. That is, as shown in FIG. 11B, when the pause mode is set in section Y4 and the second image information is recorded from the following section Y1,
Regarding the output s2J of the sample and hold circuit (35) of the joint track discriminator (33), the level of the detection output changes in the same manner as described above for the 10th factor (Fig. 11, 1), but the tracking error signal is formed. Part (31
) tracking error +4fS3 is obtained by using the sample hold circuit (34) to select the section X1 having the same frequency as the frequency originally assigned to each track among the time division sections X1 and X2 of the reference bar signal 811. The sample is bold and formed based on its output. Therefore, as long as the head is tracking correctly, the frequency of the reproduced pilot signal S2 and the frequency of the reference pilot signal Sll in this section ), this relationship also holds true for the joint track T4, so there is no fear that the tracking servo during playback will be disturbed.

In the above-mentioned embodiment, the last track during continuous shooting was selected as the fourth track T4, or alternatively, the first, second, and third tracks were selected. Any of the third tracks 'L'l, T2, and T3 may be selected.

In addition, in the above, the joint track sorting circuit (31)
The tracking error signal s3 obtained at the output end of the error signal forming circuit (3) is used as an input to the error signal forming circuit (3), but instead of this, a signal forming circuit dedicated to the seam track discrimination circuit having the same configuration as this error signal forming circuit (3) is used. A circuit may be provided, and a signal corresponding to ↓Ls to the tracking error signal s3 may be generated from this dedicated signal forming circuit, and the joint track may be determined based on this signal.

Furthermore, in the above description, rewinding is performed for J x f stick fields, but instead of this, rewinding may be performed for a certain period of time.

Furthermore, in the above description, the relationship between the frequencies of the reference pilot signal S11 and the reproduced pilot signal S2 in section X2 was selected so that they were shifted to the left in Y1 to Y3 and shifted to the right in Y4. Even so, it's funny.

Furthermore, in the above, the time division drive circuit (42) (Fig. 7) of the switch control circuit (41) is constructed with a buried circuit.
The fc case has been described, but instead of this, it is also possible to configure it with a microcomputer.

Furthermore, in the above description, the last σ) one σ) track of the first image information is used to identify the joint track, but the invention is not limited to this, and multiple σ) tracks may be used. /-1゜ [Effect of the Invention] As described above, according to the present invention, the ? (the last σ where the first information is recorded using the pilot signal) is recorded on the track together with the first information. It is possible to obtain a video signal recording device that does not require overwriting of the second information on the truck and does not cause a blank track to be recorded. reactor. Accordingly, in particular, according to the present invention, when recording the first image information 2, the pilot signal of the first frequency originally assigned to the dark blue joint track and the pilot signal of the first frequency different from this are recorded in a time-sharing manner. With,
The frequency relationship with the Nokuzurotsu signal of the different frequency is shifted to the right or to the left.] The standard Nokuzurotsu H'FA including the pilot Tsukuda signal is used and regeneration tracking is performed. According to

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the principle configuration of an ATF type tracking control device, Fig. 2 is a route map showing the track pattern recorded on the tape, and Fig. 3 is a signal waveform showing the signals of each part in Fig. 4 is a block diagram showing an example of a video signal recording device according to the present invention, FIG. 5 is a route map showing a track pattern recorded on a tape, FIG. 6 is a diagram for explaining a switch circuit, and FIG. FIG. 7 is a connection diagram showing the detailed configuration of the switch control circuit, and FIGS. 8 to 11 are signal waveform diagrams showing signals at various parts. (1)...Pilot signal detection circuit, (3)...Error signal formation circuit, (4)...Lock point control circuit,
(14)...Hip circuit, (16)...Pilot signal generation circuit, (17)...Switch circuit, (20)
, (21)...first and second difference frequency detection circuits,
(22), (23)...DC conversion circuit, (24)...
...'OJ1. dance. Circuit, (25)... Changeover switch circuit, (gb)...
・Another circuit, (31)...Tracking error signal forming section, (32)...Pilot signal forming section, (33)
... Seam track discrimination section, C34), (3ri)・
...sample hold circuit, (36) ...Schmitt circuit, (38) ...mono multiplier, (39
)...Time division signal generation circuit, (41)...Nu1tsuchi control circuit, (42)...Time division IJA rotation rotation 43
)...Nukens control 1 @buried circuit.

Claims (1)

[Claims] A reproduced pilot signal is obtained from a recording medium in which a plurality of first pilot signals having different frequencies are recorded cyclically for each track, and the frequency of the reproduced pilot signal and the frequency of a reference pilot signal are compared and matched. In a video signal recording device configured to obtain a tracking error signal such as this, when recording first image information, the first pilot (along with number i, the first bar 10 bits) is recorded on the last track of the first image information. A second pilot signal with a frequency different from that of the signal is recorded in a time-division manner, and when the second image information is taken continuously, a reference pilot corresponding to the frequency of the reproduced pilot LLI based on the second pilot signal is recorded. Output 1 for determining joint tracks by making the relationship with the signal frequency shift to the right or left.
A video signal recording device characterized by obtaining No. 8 signal.