JPS6068783A - Recording and reproducing system of video signal - Google Patents

Abstract

PURPOSE:To reproduce a reference signal with high S/N without giving beat disturbance such as cross modulation onto a video signal by recording at least one reference signal to a nonrecording part at both sides of a video recording track. CONSTITUTION:A television RF signal is inputted from a terminal 21 and fed to a composite circuit 24 via a switching circuit (switched at one frame period) 22. On the other hand, pulses (h), (i) having a period of 4-frame and different phase from each other at each 2-frame are fed to oscillators 29, 30, and this output is fed to the composite circuit 24 as a reference signal for tracking control. The oscillating operation of the oscillators 29, 30 is controlled so that the said reference signal is recorded only to a portion corresponding to the horizontal blanking period, avoiding a video information period in a recording television signal. Thus, the reference signal does not give beat disturbance to a main information signal and the signal is recorded and reproduced with high S/N.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video signal recording and reproducing method, and particularly to a video signal recording method in which a video signal is recorded on a recording medium every desired frame (or field). The present invention also relates to a video signal recording and reproducing method for recording and reproducing video signals on a recording medium as described above.

BACKGROUND TECHNIQUES AND THEIR PROBLEMS An example of a conventional video signal recording and reproducing method is to record video signals (
There was a method for recording television signals (hereinafter referred to as television signals) and reproducing them. In this method, it is necessary to use a racking system (Ill) so that the laser beam can accurately follow and scan the recording track during playback, and for this purpose, it is necessary to divide the irregular beam from the recording medium, or Japanese Unexamined Patent Publication 1973-
As described in Japanese Patent No. 50954, there are various means such as dividing the signal reading beam into so-called 3-point beams, ie, one main signal Ht collecting beam and two sub-beams for tracking, to perform tracking control. is being carried out) [.

However, all of these methods have problems such as complicated and expensive equipment.

In the conventional magnetic recording and reproducing method, the tracking reference signal is recorded on a dedicated rack using a plurality of dedicated magnetic heads, and each dedicated track is re-biopsied using a person's magnetic head. The above-mentioned 1.1 Hera-to-1 ring control has +1 power in theory, but due to the complexity of the device, it is difficult to put into practical use. gender fiti, implementation cost. This would have been almost impossible to implement in the past, considering the loss of recording density caused by this.

Therefore, the present invention records a video signal on a recording medium every desired field (or frame), and at least one reference is recorded in first and second video signal non-recorded portions located at opposite corners of the video signal recording track. A recording method that enables stable and reliable reproduction tracking of the information signal using at least six single signal recording elements by using a recording method for recording the signal and generating a ranking control signal from the reference signal to 1 during reproduction. The purpose is to provide a playback method.

Means and operation for solving the problem The recording method of the present invention records a video signal on at least one signal recording element every desired frame (or one field), and Record 1 - Record at least one reference No. 18 in the pre-record section on both sides of the rack. In addition, the recording and reproducing method of the present invention records and reproduces the recorded error of the recording medium as described above to the No. 15 conversion element,
The above-mentioned reference A11\i is differentially reproduced, and the racking control signal C1 is generated (1), and this control No. 18 controls the converting element No. 2 A5.

Only one signal recording element records the reference signal along with the video signal.
Therefore, during reproduction, the signal conversion element for the tracking control sub-beam quality I/ranking is not required. Further, at least the recording and reproduction of the ferric acid signal can be performed by a single (G conversion element).The present invention will be described in more detail below along with examples.

Embodiment FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the main part of the method of the present invention, and FIGS. 2(A) to (C) each show one of the signals recorded and reproduced by the method of the present invention. 〜Rack pattern, an enlarged view of the 1-rack pattern of the first embodiment and a schematic diagram of an example of recorded and reproduced signals, FIG. 3 is an enlarged view of the track pattern of the second embodiment of the method of the present invention, FIG. 5(A) to (K) are a block system diagram of the first embodiment of the main part of the system of the present invention, and FIG. 6 is a signal waveform diagram for explaining the operation of the recording system in FIG.
) to (F) respectively show No. 13 waveform diagrams for explaining the operation of the reproduction system in Fig. 4.1゜In Fig. 1, 1 is a flexible disc-shaped magnetic sheet (hereinafter referred to as disk), with a diameter of e.g. 3
The rotary flange of the disk motor shown in the figure is supported on the flat substrate 2 at 0 cm, for example, 1800 ppm.
is driven to rotate synchronously in the direction of arrow 9. During this rotation n5, the disk 1 is spaced a minute distance from the surface of the flat substrate 2 by a well-known technique, and a predetermined rotating surface is formed by the so-called air film effect.

The magnetic head 3, which is a signal recording element or a signal converting element, has a substantial video track width of, for example, 3 μm, and a thin flat plate spring 4. Buffer member 5. The springs 4. are attached to the moving shaft 7 via brackets, respectively. Due to the low pressure contact made of the cushioning member and the air film cushioning effect of the disk 1, it is possible to stably contact the magnetic surface of the disk 1 with a low suppressing force and move 1N. The structure is such that the displacement on a plane parallel to the magnetic surface of the disk 1 is limited. 6 is a so-called moving coil structure constructed based on the same operating principle as a loudspeaker; (The parts up to 14 consist of a permanent magnet, a driving coil, and a yoke (all not shown), and the coil part is supported by a damper shaft to form a moving shaft axis 7, and this moving shaft @7 is the above-mentioned drive =
I'M is quantitatively displaced in the disk radial direction in accordance with the direction and size of the current applied to the current.

However, M
The signal converter including the magnetic head 3 is taken, and the magnetic head 3 moves in the y direction perpendicular to the signal track formed on the disk 10 by the magnetic head 3. The signal converter and the moving coil mechanism 6 are mounted and mounted on a transfer mechanism (not shown) so that the signal converter and the moving coil mechanism 6 are moved in the radial direction 8 of the disk 1 when recording or reproducing signals. It is transferred j3 linearly at a slow speed synchronized with the rotation of 1. During signal recording, the signal converter and the moving coil machine 4t06 are moved in the radial direction 8 of the disk 1 while the moving coil 11m6 is not operated. Simply change the frequency of the TV signal as if it were
The information signal is magnetically recorded by forming a spiral track locus.

To explain the operation of the recording method according to the present invention, the disc 1 is separated from the frame pulse shown in FIG. 5 (C) separated from the television signal to be recorded as shown in FIG.
is driven to rotate synchronously at, for example, 1,800 rpm, and while moving the signal converter in a predetermined direction from the outer circumferential direction to the inner circumferential direction on the radial direction 8 of the disk 1, the magnetic head 3 receives J.
Disc 1 by recording the above TV signal.
A spiral signal track trace is formed on the disk 1 in units of frame periods of the television signal, and the vertical synchronization pulse and horizontal synchronization pulse portions of the television signal are recorded in parallel lυ in the radial direction of the disk 1. Here, the television signal is thinned out and recorded every desired frame (so-called frame skip recording) as will be described later, and in the first embodiment, a 1-racking reference signal is used in the non-recorded portion of the television signal. 2-5 rP1. which have different frequencies from each other. rP
2 are recorded on the desired frames 10 and 10 in an alternating manner.

. The television signal to be recorded is in units of vertical sync pulses.
Then, the result will be as shown in FIG.

1:2. . . , 1 near indicates the first frame, second frame, . . . , seventh frame, respectively. This TV signal is
A frequency modulator (not shown) modulates the frequency of a carrier wave with an appropriate frequency suitable for magnetic recording and reproduction, and outputs a C high frequency frequency modulated wave (RF multiplied signal) to the input terminal 21 in Fig. 4.
is applied to the switching circuit 22, where it is reswitched to the switching pulse from the input terminal 23. This switching pulse is triggered by a pulse as shown in FIG. 5(C) with one frame period obtained by discriminating the relationship between odd and even fields from a television signal This is the output pulse d shown in (D). As shown in Fig. 5(E), the pulse is the above pulse d.
is the flip-flop output pulse of opposite polarity.

The switching pulse d causes even-numbered frames F2, F4 . F6. The switching output is output from the RF double signal switching circuit 22 of ..., and the combining circuit 2
4.

On the other hand, in FIG. 5(E) above, flip-flops (Us shown in the figure) J, S,
As shown in (F) and (G) of the same figure, pulses f and Q with opposite polarity (period 11J are 4 frames) are taken out, respectively, and these pulses are the same as those in which the pulse e is applied to one input terminal. 1 and the second AND GO 1- (not shown) and respond to their respective positive polarity portions/j portions only.
Output. As a result, pulses e and [ from the first ando goo 1 to
Therefore, pulses e and Q are logically ANDed, and a pulse i shown in FIG. 3(I) is output. Pulse 11.1 is positive electrode f%
The interval between JUJ and JJ is one frame, the repetition period is a four-frame period, and the time phases are different from each other for two frame periods, and the positive polarity period of the switching pulse d is sequentially alternated every frame by H. The relationship is a repeating frame cycle. This pulse 1) is applied to the input terminal 27J, an oscillator shown at 29 in FIG.
J is applied to the oscillator 30, causing the oscillators 29 and 30 to oscillate only during the positive polarity period, and stopping the oscillation during the four oscillation periods. The output signals of the oscillators 29 and 30 are applied to the combining circuit 24 as a reference signal for one-to-four-ring control.

Here, in this embodiment, the reference signal causes interference to the main 11j information signal to the bee 1 in the magnetic recording/reproducing transmission system.
- For the purpose of preventing harmful effects, recording at a suitable level, and recording and reproducing a reference signal with a high S/N, the video information period in the recorded television signal is avoided, and the portion corresponding to the horizontal blanking period is The oscillation operation of the oscillators 29 and 30 is controlled so that the reference signal is recorded only in the oscillators 29 and 30.

FIG. 5(J) shows a television Ω@ in which horizontal synchronization signals are shown as units, where 45 is a video information signal section, 46 is a horizontal synchronization pulse section, 47 is one horizontal scanning period (11-1), and 48 is a horizontal return signal. For convenience of explanation, the horizontal synchronizing pulse is separated from the input television signal and generated into daily cycle pulses, and only the width of the period corresponding to the horizontal blanking period is shown. It is extremely easy to shape the pulse into a 1Hlti 1-period pulse with positive polarity, and in the embodiment, the recording position of the reference signal is not inserted into the entire horizontal blanking period for the reason described later, and the recording position is inserted into the 2H period every 1H. Two kinds of reference signals are inserted into the recording pattern traces adjacent to each other by sandwiching one main information 1-rack on the recording pattern stationary surface with a shift of 1H, as shown in FIG. K) is oscillator 2
This is the output waveform of 9.30.

Therefore, the oscillator control pulses h, i have the respective positive polarity lv
Furthermore, in relation to the horizontal period as shown in FIGS. 5(J) and (K) above, the oscillation occurs only in the horizontal blanking period corresponding part, and in this embodiment, only in the 2-day period. oscillator 29. ．． 30, the oscillator control pulse is shaped.

The oscillators 29 and 30 are simply composed of, for example, crystal oscillators, and a relatively low oscillation frequency of I M l - I Z or less is sufficient. ), the oscillation frequency of the oscillator 30 is selected to be 700 MH2 (g, lower fp 2 ), and each oscillator horn is applied to the synthesis circuit 24 to generate the switched [F signal together with the oscillation frequency of 700 MH2 (g, lower fp 2 )]. Three types of signals are combined. The three types of signals with the J1 frame period shown in FIG. Recording/playback selector switch 26 connected open to the fixed contact R side
is applied to the magnetic head 3 through the
The even-numbered frame signal F2 of the television signal is placed on the magnetic surface of
, Fa, Fe,... as the reference signal f with /υ
p+ and rpz are recorded alternately and repeatedly.

Next, the recording track pattern trace will be explained. In this embodiment, J5 is used, and the track width t of the magnetic head 3 is 3 μm.
, the track pitch p is 2 μm, the above figure 5 (B
) The locus of the 1~Rack pattern formed on the °C disk 1 by the recording signal as shown in FIG. 2(B) is as shown in FIG. 2(B). In the same figure (B), if 11 is the frame pulse position of the recorded television signal, the disk 1 moves 180 Orp in the direction of arrow 9 based on this pulse as described above.
Since the synchronous 4-novo drive is performed at m, the lifting platform whose frame pulse position number 11 is set to 525H for convenience is 1-
In numerical order (1), (2), (3), (4),
..., (522), (523).

It is clear that (524) and (525) H are sequentially aligned and recorded in the radial direction of the disc 1.

Yes, t2. t3. ..., tll is a spiral track sequentially formed by the magnetic head 3, the first time -
fP I is ■ on t1 of the knot, (4).

6),..., (520), (522), , (5
24) One circular cycle is recorded in each even-numbered horizontal blanking interval corresponding portion of the H position, and recording starts from the frame pulse position 11 and ends at the position 11. second 1
- The rack t2 forming aid has a track width t of 1 in this embodiment.
It's more human than Hellac Pitch p! , :me, truck [1
The inner edge of 1-rack is 16.1-rack [The outer edge of 2 is 17 as shown in 1, 1-rack tl, j2 has an A-burlap part 14, and in this part J3 is used to overwrite and record signals. . This overlap part 14bat=3t1m
, p=211m platform, 1μlit. However,
Track (Succeeding from track 1, the main RF signal frame F2 is recorded by the vIi head 3 as shown in FIG. 5(B) to form track t2. 1 after recording the reference signal fp+ at t1
- As a result of recording a part of the TV signal of frame F2 ("F signal") on the rack 12, the reference signal of rp+ recorded with a predetermined width of 13 between the horizontal retrace lines is
As shown in the enlarged figure (C), the overlap part 14
is the 1=th mark of the overwrite record, indicated by 19, and the 1 portion is slightly demagnetized.

Recording of the R11 signal of frame F2 is also started from frame pulse position δ11, and up to this position 11, the TV signal of one frame is recorded in [・rack (2).Next, on the third 1~rack t3 The reference signals of fp2 are (1), (3), (5), ..., (' 521
).

<523) Recording is performed at a position and width corresponding to the horizontal blanking period of ff1l-1, but 1- of the magnetic head 3 is recorded.
From the relationship between the rack width and the transfer width, the scanning width 1 of track t3 is also 3Jlris-! as shown by the broken line! Therefore, when track t3 is formed, it also has an overlap portion 14' with track t2, and as a result, a portion of the width of the recording moisture signal of track t2 and a portion corresponding to the odd-numbered horizontal blanking period. It is clear that overlapping old recordings of signals are made.

3rd i31 to rack reference signal [After recording to P2 frame pulse position @ 11 is completed, the main RF multiplication signal 4 on t4 is pulse position @ Recording continues up to 11, and track t
Recording is performed while being demagnetized by the same superimposed recording of fp2 already recorded on DX'; A-paragraph. As a result, the signal fp2 is the main j, indicated by diagonal lines, and the information track t2 of the RF signal. This results in the formation of a bridging layer on L4Jx. Also, in the guard band section 15.15' the main [('signal is recorded and J
3, f, reference signals fp+, and fpλ are arranged within corresponding horizontal blanking periods, and in this embodiment, 1
The width is μm.

Thereafter, by repeating the same procedure as above, one rotation period of the disk 1, the frame period (1/30 second) is set at li, and the frame pulse position 11 is set as the starting point and end point of switching recording.
On t6, the main l(]=signal of F6 is on Ly, and while sequentially switching the recording up to tn in the order of fp2, for example, 30
Recording was performed for 54,0000 t-racks to form a 1-rack pattern as shown in FIG. 2(B).

Note that when the track pitch is set to <track width as in this embodiment, as is clear from the above explanation, the successive track widths inevitably overlap and some parts are recorded overlappingly, causing playback. Sometimes in J3, three types of information signals are always reproduced at the same time.

Therefore, in principle, the present invention records the rp+ and rpz reference signals as continuous waves, including the part corresponding to the video A information of the television signal, by simply changing the frequency to FU every other rotation, and C also achieves the initial purpose. obtain. However, this method uses a high S
The port 4, which records at a strong level even though it should be played back at /N, has the disadvantage that it causes interference with the TV signal when the signal is played back. On the other hand, when a reference signal is inserted and recorded in a period corresponding to the horizontal blanking period as in this embodiment, the reference signal recording of [ρI, fP2 does not cause any hindrance to the main information signal. It has this feature.

Therefore, for example, in frame unit recording of the entire H period, 5
fp+, fp2 at positions corresponding to the horizontal blanking period for 25 lines
According to the method of inserting and recording, the above-mentioned bee 1~ disturbance does not occur, but as in this embodiment, fp+, fp
It is clear that the reproduction sensitivity of (PL, tP2) can be increased by inserting and recording 2, and the horizontal scanning frequency is 15.75kl-lz in the Japanese and American standard television signals.
However, the pulse train η・of about 7 kl-lz, which is half of this,
61-If the racking information is sufficient and the applicant's experimental results indicate that J, then the number of rotations of the disk is 1800 r p
In the case of l, the basic disc eccentricity error component is 301-
Since it is 1z, even a 3H cycle Pyrower 1- signal has ±
For unbalanced fertilizer of about 100μm, sufficient 1-racking correction accuracy can be obtained.

In this example, each of fp+ and fp2 is set to 2H.
In order to insert and record the periodic pulses at predetermined positions shifted by one day, the 1CI-1 day period pulses are used as frame pulses from Sera 1 to . It can be easily generated by a logic circuit that resets the pulse by 1/2 and counts down the 1-1 period pulse by 1/2.

Next, a second example of recording 1 to easy pattern traces will be explained with reference to FIG. This embodiment accepts the track pattern formed on the disk 1 when the rack pitch p and the track width t are approximately equal. Now, for example, p=
When t=2 μm, 1~lack Reference signal fp for L+ Recording of I, 1-lack Signal recording of frame F2 for t2, 1~lack Reference signal f for J for t3
P2 record, and] Herakku [Frame F for J to 4
4 are opposed to each other in correspondence as shown in FIG.
The reference signals fp+ and fp2 are recorded almost to the full width of the reference signals fp+ and fp2, and no overlapping recording of signals is performed, and the reference signal [Pl.

fpz will not be reproduced simultaneously, and one reference signal from the shifted direction will be reproduced instantaneously.

Therefore, 1-racking control reference signal rp+.

In this embodiment, it is not a problem that B1-interference is caused to the main RF information signal as in the overlap recording method where fpz is in the first embodiment (p<t), and as a result,
The reference signals ipl and rP2 may be continuously recorded or may be inserted and recorded within the entire horizontal blanking period. Further, only in the first and second embodiments described above, f and p>t may be satisfied.Second, the operation of the reproduction system according to the present invention will be explained.

During playback, the recording/playback selector switch 26 (other fixed contact 1
] side. The weak signal from the magnetic head 3 is amplified to an appropriate level by the preamplifier 31 in FIG.
) and demodulated to the original television signal.

Also, the reference signal fp amplified at the front stage of the preamplifier 31
+, fp2, this signal fP+, iP2
The signals are applied to the amplifiers 33 and 34 for separate amplification. The preamplifier 33 is a prefilter amplifier installed so as to have a steep frequency characteristic only at a frequency corresponding to fpl, and the preamplifier 34 to have a steep frequency characteristic only at a frequency corresponding to fP2. The output signals of these amplifiers 33 and 34 are separated into only fpl and fpz, the −C reproduction levels are made equal, and are led to the next polarity switching gate switching circuit 35, where a switching pulse from an input terminal 36 causes at least During normal playback, the polarities of fpl and fpz are switched and output every two frames.

As is clear from the so-called field-skip recording and playback technology of the conventional (41st recording technology), television signals are composed of field-by-field and frame-by-frame signals that have many correlations. This skip recording and playback of unit signals doubles the recording capacity, and in order to convert it into real time in the playback process, at least during normal playback, the same track should be played twice. It is necessary to scan and reproduce the address.

During normal playback, since odd-numbered frames are missing during signal recording, the recorded even-numbered frame signal F
2, F4, Fs, . . . are reproduced, but the missing Fa, F5. ,'F,y,・
In order to replenish and replay ... in a pseudo manner, F2, F4
, Fa.

. The preamplifier 34 separates the reference signal [ρ2] as shown in FIG.

By the way, for example, in FIG. 2(B), the magnetic head 3 moves from the J position shown in 3a by one swinging rib (
If the playback is started without eccentricity of the disk 1 with the movement of the head 3 stopped in the inner radial direction, the playback amount will be 1 to easy at point Ci IIJ (frame pulse position 11). The maximum regenerative RF output of 2J and ri can be obtained. However, as the magnetic head 3 moves from this starting position 11 in the rotational direction 111, the magnetic head 3
tracks scan on the same recording radius, whereas tracks such as t2 are formed in a spiral shape, causing track deviation toward the outer circumference of the disk. It deteriorates to about 3. Similarly, when the magnetic head 3 is at the position shown in 3b in FIG. 2(B), at the beginning of the first playback it covers only the top of the track t4 from 1 to 4, but at the end of one revolution near the eye 1. l-Rack (1 to Rack (2) [4 R
The F signal is reproduced at the same time, resulting in an extremely unsightly reproduced image accompanied by B1-interference. In other words,
As shown in Figure 2 (13) or Figure 3, if the head 3 is transferred to the recording track pattern without racking in the same way as when recording, a satisfactory reproduced image will not be obtained at all. On the other hand, the signal rP reproduced when the magnetic head 3 is positioned at the position 3a
The level relationship of I, fl)2 is ([Start 11.1 near the frame pulse position 11, fp+.

It is clear that fP2 was being reproduced at the same level of 1, but as disk 1 rotates, the l-rack shifts spirally toward the inner diameter of the disk.
The reproduction level of I gradually increases as the rotation progresses, and conversely, the reproduction level of signal fp2 gradually decreases.It is clear that near the end of one rotation, fPl is reproduced at the maximum level and fp2 is reproduced at the minimum level. It is.

Therefore, the output signal fp+ of the same amplifier 33 and 34 is
, fp2 are introduced into the detectors 37 and 38 through the switching circuit 35, which detects the envelope, and converts the level into a DC voltage, which is applied to the racking servo circuit 39 and the differential amplifier. (not shown) and a control technology that compares the phase and level of the two using well-known servo circuit technology, the driving power is supplied from the circuit 39 to the moving arm on which the magnetic head 3 is attached.
By applying M6, the magnetic head 3 is kept scanning on a predetermined track. In other words, rp+ is generated by the closed-loop dragging servo loop described above.

The playback level of rp2 is j:! In other words, 1-racking control is performed so that the reproduced RF output level from the track is always at the maximum peak value, regardless of the rotational position and phase, so that the track is reproduced by a certain number of people in accordance with the rotational position.

Here, when the output signal level of the detector 37 becomes equal to the output signal level of the detector 38, the magnetic head 3 is controlled to move toward the inner circumference of the disk 1, and the output signal level of the detector 38 becomes higher than that of the detector 38. 37, the magnetic head 3 is controlled to move toward the outer periphery of the disk 1. A servo loop is configured in advance to compare the level relationship between the two polarities. Therefore, when no switching pulse is applied from the C1 input terminal 36, the output signal fp+ of the preamplifier 33, 34.

fP2 passes through the gate switching circuit 35 to the detector 37
．． 38 respectively. Therefore, in this case, for example, assuming that the magnetic head 3 races 1-rack t2 from 1 to 1, the result after reproduction up to (525) H at the end position of one frame of track t2 reproduction is shown in FIG. 2(B). As shown, the magnetic head 3 starts tracing on the track t3, but from this i~rack [3, the signal 1
As a result, only 'p2 is reproduced at the maximum level, the output level of the detector 38 becomes the maximum, and the above polarity setting causes the magnetic head 3 to rapidly move towards the outer circumference of the disk ', '1, and fP+ and fP2 Since the 1-racking servo is turned on at the position where the playback level of 2 becomes the equilibrium level, even in the step-jag discontinuous track portion of the 2nd frame pulse position 11, it is always pulled back to track only track 2, and in this case By repeatedly reproducing only the track t2, a frame-by-frame still image can be obtained.

Next, in the normal play mode J5, the signal pick-up body is moved along the radial direction 8 of the disk 1 via a transfer mechanism (not shown) at a predetermined pitch (implemented) at a speed synchronized with the rotation of the disk 1 as during recording. In the example, the frame is transferred in a straight line to 2 μm), but because of the frame skip recording as mentioned above, when the rack is recorded at 1 frame per rack per rotation 11, the rack is transferred to the same 1 frame. It is necessary to scan and reproduce the frame pulse twice.To do this, the magnetic head 3 must, for example, track the frame pulse position 11 from 1 to t2 twice in FIG. 2(B).
It is necessary to move the head from the 12th track position on the right side of track [4] to the position indicated by the broken line 3b at the discontinuous adjacent track position of track [4]. This movement is performed as follows.

1. That is, if the C tracking 1 nervo is operated with the polarity of [+)l and fP2 maintained from the state where the magnetic head 3 approaches the above position 11, the pickup body is moved in the inner diameter direction. However, the magnetic head 3 does not move from 1-rack t2 to track t4, and continues to trace only J~rack [2], but it moves to 1 twice on track t2. ! from position 11 to
We decided to reverse the polarities of fPl and rpz and apply them to the tracking servo circuit 39 with the opposite polarity.
Contrary to the case of 2 upper tracing, [1-racking turbo control operation is performed such that the magnetic head 3 is moved in the inner radial direction by the detection of 1J2, and the magnetic head 3 is moved in the outer radial direction by the detection of fPl.

In this embodiment, a switching pulse as shown in FIG. 6(D) with a symmetrical 4-frame period of 2 frames positive and negative generated based on a frame pulse reproduced synchronously with the frame pulse position 11 is used. By applying voltage to the gate switching circuit 35 from the input terminal 36 in FIG.
The output J signals rp+ and rp2 are switched every two frames. In this case, the output signals from the switching circuit 35 have different frequencies as shown in FIGS. 6(E) and 6(F), respectively, and the frequency is changed to [Pl] every two frames.

The waveform in which fp2 is arranged is set, and the foot detector 37°38
(-) is supplied to the magnetic head 3. As a result, the magnetic head 3 receives (-
Rack (tracked 2 twice!,,:
Thereafter, 1~racking control is performed so that only on 1~rack t4, the reproduction level of tracks P11 and P2 remains in an equilibrium state, and the reproduction RF level from J, that is, the track 14, maintains the maximum value.

Below, the magnetic head 3 moves from 1 to easy [After racing 4 to 1 twice, start again from position 11 fF + + fP 2
By reversing the inputs of the reproduced signals to the detectors 37 and 38, the control is performed such that 1-racking 1-race J is performed on 1 rack t6, and thereafter the reference signals fp+ and fp2 are sequentially input at two frame periods IU. By switching the detector input, the signal is moved in the direction of the inner diameter of the disk, and so-called normal playback is performed.

Also, for example, the transfer speed of the pick-up body H is reduced to 1/3 of the normal playback speed (however, the rotational speed of the disk 1 is the same as the speed during normal playback), and the same track is transferred to 3i1~ (- It is clear from the above explanation that by switching the above signals rP1.fP2 so as to play the race (2X3=(once)), a three-speed slow motion image (elephant) can be obtained. 1! Solution, and if necessary, perform operations based on the same principle, such as forwarding one frame, reversing playback, and high-speed cueing. 107., > 1
It is clear that there will be no success in 11!7.

As mentioned above, the tracking revo circuit 39 may be a well-known circuit, and first, the input circuit section is configured to compare two erroneously received signals with a differential amplifier. Strictly speaking, when a disk with track pattern traces of the first embodiment is reproduced, as shown in FIG. Therefore, it is desirable to correct the level drop during reproduction by taking into account the detection output and input it into the 4-water circuit 39.

In addition, when playing back a disk with traces of rack patterns 1 to 1 of the second embodiment according to FIG. The signal processing for this may be of a configuration similar to that shown in FIG.
'ii'[11> If 4”L (7) Outlet ig
No. fp +, fp 2 (1) Level is also minimum 1+iI
J, who maintains a state of equilibrium, is shaken again (,
Tracking control is always performed in a state where the RF output signal level of 1 is outputted from the head to the maximum level fF7 (there is essentially no difference in terms of 1, 4, and 1q).

FIG. 7 is an enlarged view of the 1-rack pattern of the third embodiment of the method of the present invention, and FIG. 8 is a block diagram of the second embodiment of the drum section of the method of the present invention.
] Shows the Tsuku family tree. In each figure, Figures 2 (A) to (C)
, the same parts as in FIG. 4 are designated by the same reference numerals, and their explanations are omitted. 1) In the 1-to-rack patterns of the 2nd and 2nd actual seat examples, the two tracking system tall reference signals were recorded alternately in sequence at each rotation period on the 1-rack corresponding to the non-recorded portion of the TV signal. However, in this embodiment, this is further modified. Only the first reference signal rPl is recorded at a position corresponding to the horizontal blanking period of 7 Lebis month every 31-1 period, for example, as shown by the solid line in FIG. 7, and the second reference signal rP 2 with the TV signal and this Rarepi signal recording 1-rack (t2. L, Le.

18,...) at the position corresponding to the horizontal blanking period of 31-
Switching is recorded in one cycle flJ as shown by the broken line in the figure, and the signal (R2) is used as a reference signal for gate discrimination of fP+ during reproduction.

In FIG. 8, first, during recording, the input terminal 27'.

From 28', first and second switching pulses each having a positive polarity period equal to the horizontal blanking period and a repetition period of 3H, for example, are applied to the oscillator 29,30. The rising points of the first and second switching pulses are shifted by one day from each other.

That is, when the first switching pulse rises I+, the second switching pulse rises from point 1 to 11-Im -C. Here, to explain how to generate these switching pulses, first, based on the recorded Besa TV signal J, the separated water/IL synchronization No. 16 I↓i,
As a result, a 1/3 countdown η will be performed to generate 1 g of repeated pulses with 311 cycles, but at this time, separate /, l Handle the frame pulse from the above synchronization signal, and use it as a reference to set a predetermined value from the frame pulse recording position. Avoid missing one or more horizontal synchronization signals at the th recording position, and set the switching pulse to 1! It is something to do. for example,
In the 11-rack pattern shown in Figure 7, the spiral j
t2. If the horizontal synchronization signal recording position (525) of t4+t6+... is taken as the frame pulse recording position 11, only the first (1) horizontal synchronization signal located next to this recording position 11 is missing, and the signal corresponding to this omission is By spacing only the part at 2H intervals, the number of horizontal scanning lines is actually increased to 524, generating 111J pulses per continuous pulse, and this 1" periodic pulse is further counted down by 1/3 by the tI number logic circuit. A desired switching pulse can be obtained by performing pulse processing so as to obtain the desired switching pulse.

Among the output signals of the oscillators 29 and 30 whose oscillation is controlled by this switching pulse, the frequency rp of the oscillator 29 is
The output signal I of the switching circuit 22 is output 1 (1: signal missing period and only during the horizontal blanking period of the recorded TV set every 3 days; on the other hand, the output signal of the oscillator 3
The output signal with a frequency fP2 of 0 is output within the horizontal blanking period of the television signal and at the periodic interval of 3), and is superimposed on the output [R1: signal of the switching circuit 22 at an appropriate level. As a result, the trace of the rack pattern 1 on the disk 1 is shown by the solid line C in FIG.
1: signal) non-recording 1 to easy tl, [3, js,...
・In addition, the television number 13 (as shown by the dashed line on p 2, even number 1) (g@recording track j2.
4. It is superimposed and recorded on j6°... Also, the signal fp
+, rp2 is recorded every other rack, and
For example, 11, h, ... are recorded in parallel in the direction of the center of the circle with a period of 6F racks, and fp+ and rp2
are recorded at positions shifted by 11-1 from each other.

Next, the operation during playback will be explained. The signal f extracted by the preamplifier 33 by the same operation as explained in FIG.
p+ is applied to circuit 52.54 to goo1. Further, the signal [R2 taken out from the preamplifier 34 is applied as a trigger pulse to the monostable multi-vibration break 50 with an oscillation time constant of 1.5 Ll, which causes 1 to 3 oscillation. This oscillation output is applied to the circuits 1 to 52.54 from input terminals Eil, 5'3, and the reproduced signal fP
Output l as gool.

For example, when the positive polarity period of the output pulse of the multivibrator 50 described in - is heard (approx. The signal fp+ reproduced at the inner circumferential position of 1 inch is output, and the 4th pulse of the above IC is output.
At a time phase corresponding to the polarity period (approximately 1.58), the gate circuit 571 outputs 2
At 1-111, the signal fPI reproduced from the outer circumferential position of the reproduction track is gated out. This goo 1-circuit 5
The output signal 2.54 is outputted as a dragging control signal by the same operation as explained in FIG.

In this embodiment, during playback, the signal processing is performed as follows at frame pulse position 11 of the recorded signal. Normal playback and special playback such as slow and still playback can be performed. . In other words, a reproduction frame pulse whose phase is substantially coincident with the frame pulse position @11 of the signal switching during recording is obtained, and by this frame pulse, positive and negative polarity signals corresponding in phase to the vertical blanking period of the reproduction television signal are obtained. Shape into pulse. This is JiX7
The signal is applied as a damping pulse to the tracking revo circuit 39 from the input terminal 55. By this \7 pumping pulse, moving coil R4 is activated during the vertical blanking period.
A servo configuration is adopted in which N can be forcibly controlled instantaneously from the outside at a portion corresponding to the frame pulse recording position 11,
The polarity, pulse width, and amplitude of the frame pulse are set to predetermined values. During playback, the head rapidly moves from the discontinuous position of the recording position 11 to the 1~Rack position shifted from 1i~Rack in the previous stage. It is easy to drive the 1-racking control element using known technology, and the switching control operation may be performed in conjunction with the above-mentioned playback operation mode.

In addition, in this embodiment, since the main information signal and the reference signal for racking control are always open ICY playback l-1, fp2 is configured to be recorded in the video 1 to rack part when recording fPI. Then later.

In this example, during signal reproduction, the signal fp+, which is reproduced after 11-1 with respect to the reproduction position of fp2, is always affected by the adjacent blur (No. ii non-recorded part) on the inner circumference side of the reproduced video track. The signal [■・1, and the signal fp+ reproduced at the fP2fl\production position 2 +-I K is always the signal fp+ on the adjacent TV non-recorded part on the outer circumference side of the reproduced video track. By generating a gate pulse by separating fp2 from the reproduced signal and outputting the reproduced and separated fp1, f
kfp is regenerated 11-1 after the regeneration horn position of p2
By discriminating and outputting whether the signal is a signal or an fp+ signal reproduced after 21-1, the position of the track in the direction of deviation is identified and racking control is performed.

The present invention is not only applicable to the device using magnetic recording and reproducing technology for television signals mentioned above, but also applies to the continuous recording of television signals by applying optical systems and reading the signals with optical beams. Not only can it be applied to a reproduction device, but also a well-known contact scanning method that picks up a so-called optical beam pattern cut and recorded by an optical beam in a capacitance format or a mechanical vibration format. It is also possible to use this scanning side in combination with the 1 Hertz A-ng control 211 element without using the 11 to provide a sword guide.

FIG. 9 shows an enlarged view of the track pattern of the fourth embodiment of the method of the present invention.
1-Rack has reference signal @ fPI pin 1, 1~
Rack 2 is inserted and recorded at a position corresponding to the horizontal blanking period of the television signal recorded in rack 2, and the main pitch pattern of the television signal is recorded in rack 1-rack L2.
3, pits of the reference signal fp2 are inserted and recorded in the horizontal blanking period. Thereafter, these three types of information signals are sequentially and alternately recorded on the studs every frame around the disk '1. Further, during reproduction, the open signals rp+ and fp2 are separated into the negative signals, and reproduction 1-racking control is performed in the same manner as described above. In addition, in this embodiment, A-bar ramp recording is performed as in FIG. Good too. 41.Compared to the conventional method in which the scanning side is regenerated by moving the scanning side within the guiding area, there is no need for a guiding area, so the contact width area of the board surface on the scanning side can be greatly expanded. It can be extended enough and in slow motion, Sujiru fIJ student arbitrarily forms a video play 1 no and I'.

FIG. 10 is a partial enlarged view of 1 to 1 rack patterns of the fifth embodiment of the method of the present invention, in which tracks are formed in a spiral shape with p<t for one field of one-field video signal for one rotation of the disk.
1+, 12. ...In between, A-bar love part 171,
There is 14'. In this embodiment, the disk 1 is 3GOO with a phase difference of +11J to the heavy 11ζ synchronization pulse of the video and other signals.
The signal is recorded and reproduced by being synchronously rotated r times. In the case of Japanese and American TV video signals, the number of horizontal scanning lines in one frame is 525, as is well known, and the odd and even fields are interlaced in L7 to form a frame image. When recording and reproducing signals at least in field units, one field is 262.5N (-525/2), so the reference signals fp+ and fpz are alternately generated every rotation of the disk.
When inserting and recording into the part corresponding to each horizontal blanking period, 1
~The easy pattern is as shown in FIG. In the figure, 11 indicates the vertical WJ pulse recording position. truck
((1), ■, (3) from the vertical synchronization pulse on 1.

..., (260), (261), (262) number H
The reference signal fp+ shown by a solid line is recorded in the first (odd number) field corresponding to horizontal synchronization pulse recording, and then the second (even number) of the video signal is recorded on rack t2.
The field is recorded on the broken line track section, and the horizontal +UJ pulse position of this even field is <263>
, (2G4> , ..., (!124) , (525
). Furthermore, the reference signal fp2 is racked to the third 1 (as shown by the vertical solid line of the 2 tree above 3).
(odd number) IΦ person is recorded at the corresponding horizontal periodic pulse recording position of Fieldro as shown in the same figure.

Here, track t2. I4. L6. . . . The vertical broken line portion of the horizontal synchronizing pulse position 100 of the even field in the video signal recorded and formed above is l-rack tl.

t3. t5. ...Reference signals rρl, fP to be inserted and recorded at the horizontal synchronizing pulse positions corresponding to the odd-numbered fields above
With respect to z, the phase relationship is shifted by T degree 1/2H as shown in the figure.

However, as in d3 in this embodiment, when the field unit signal is particularly recorded by Δ-burlap, fp+, fp2
Since the recording position is such that the phase is inserted from video signal recording 1 to approximately the center of the rack section, there is a possibility that the reference signal fp1°fp2 may cause beat disturbance to the reproduced video signal.

Therefore, according to FIG. 10, if the present invention is applied to record signals in units of 1 field per rotation of the disk, the above-mentioned reference signal is The reference signal fp+ is used so that the I11' single recording position of fp1.rp2 is in phase with the horizontal blanking period part of the video signal part to be recorded.

The recording phase of fp 2 is shown in Figure 11 <1/21-1
By configuring it so that it is inserted and recorded in a staggered manner,
- Eliminate interference and get good results in one step.

Although the above example shows the case where the easy pattern from Formation 1 of the present invention is carried out in a spiral form, the present invention is not limited to this. Even in the case of magnetic recording and reproducing by forming many concentric rack trajectories on a disk medium, the three types of information signals mentioned above can be appropriately arranged for magnetic recording and reproducing. In addition, if necessary, a device that appropriately combines multiple heads and multiple drive elements can be used.
The recording and reproducing operations of these signal converters may be sequentially crossed 7j (1'4).

In each of the embodiments shown in FIGS. 7 and 8, an embodiment will be described in which the reference signal fp2 is intentionally inserted and recorded on a track where a video signal is recorded for the purpose of discriminating the reference signal fPI. However, the method of the present invention is limited to this, so Q, < , only a single reference signal is recorded every predetermined period, and during reproduction, the reproduction time phase relationship of this single reference signal is discriminated. There is a C' that can fulfill the initial purpose by doing this.

For example, in FIG. 7, when recording and reproducing the vertical synchronizing signal recording position 11 in units of frame video number 5, moving the vertical synchronizing signal recording position 11 to the li position, the reproduction reference signal is set to Katsuto-Ruru 1st stage related-CG1~Rack (
If you change only the rack to reference signal record 1, it will be 31-rack)
Taking into account that the recorded phase is regularly arranged and recorded in a single reference for each period, it is logically calculated based on the recording phase 11 in -, or when it is approximately 31-1. A monostable multivibrator with a constant value is scanned by a means such as sequentially gating the control signal for reproduction by scanning the monostable multivibrator with the reference signal indicated in the column. It may be configured to perform i~ racking while distinguishing the relationship between the reproduced phase of the reference signal 11 and one column and detecting the direction of deviation, and furthermore, the reproduced signal may not be subjected to complete peak value control. However, C can similarly achieve the initial purpose by comparing the reference signal fp+ and the signal re-received from the rack to video 1 at a predetermined level ratio.

Furthermore, FIG. 10 shows an example in which the vertical synchronizing pulse is separated from the recorded video signal, and the disc is driven to rotate synchronously with it, and exactly one field of video signal is recorded for one rotation of the disc. However, the present invention calculates the horizontal synchronization pulses, for example, 262 or 263 per rotation of the disk by using an integer multiple of the horizontal scanning period, and thereby rotates the disk. It is clear from the above description that the present invention can also be implemented in the case where recording is performed in field units in a form in which the irregular discontinuous period of 1/2 as in the fifth embodiment is eliminated.

In addition, the present invention is not limited to magnetic recording and reproducing devices in which the frame period of a television signal is a unit, but is applicable to a device that records and reproduces in field units and records and reproduces signals in units of any integer 8. Needless to say, the purpose of HgJ is achieved and achieved, and by making no modifications, we have developed a tracking error signal detection device for magnetic recording 71T raw-M position using the D-A-Dave. It is also conceivable that it could be applied to

1=, the Kinei Akira method is not limited to the one shown in FIG. 4 or FIG. 8, and the 1 to easy patterns of the recording medium are shown in FIG. , FIG. 10 or FIG. 11.

In addition, the reference bones for racks 1 to 1 do not need to be of two types, fp+ and fp2. It is only necessary to record the second signal and the second signal.

Furthermore, the present invention is not limited to the above-mentioned embodiments, but the reference signal of the minimum L1i-, for example, may be set every 3H and at a different position every 3 tracks, at least in phase with each other. Recording is inserted into the unrecorded portion between the adjacent video signal recording racks, and during playback, J3 discriminates the playback time phase to detect the direction and start of deviation at the time of mistracking. Depending on the configuration, the purpose of 1-racking control can be achieved as in each of the above embodiments.

- As mentioned above, according to the recording and reproducing method of the present invention, the reference signal can be recorded at a predetermined position simultaneously with the video signal with a simple configuration, and the video signal can be recorded at the same time as the reference signal. By inserting and arranging and recording the reference signal only in the corresponding portion within the horizontal blanking period of the recorded video signal, it is possible to prevent beat disturbances such as TLFI modulation from occurring in the video signal. The reference signal can be reproduced at high S/N without any drop.

In addition, at least video signal recording and playback can be performed stably and reliably with a single signal conversion element, the configuration is simpler than conventional equipment, and the storage of recorded information signals is improved and compatibility between equipment is improved. .

Also, during playback, normal playback, still playback, frame-by-frame forwarding, information search, two-starting, etc. can be performed as desired in relation to the device mode. In addition, since the video signal is recorded every desired frame (or field), the recording density is increased, and especially when applied to a magnetic recording/reproducing device using a rotating magnetic medium as the recording medium, a single Main information 1-rack and 1-racking control 1-rack are sequentially recorded in an alternating manner on a rotating magnetic medium by linearly moving the signal recording/reproducing magnetic head at a predetermined pitch using a spiral track. Therefore, the initial purpose can be achieved with a very simple 4ti J 戊.

Furthermore, a 1-rack pattern can be recorded so that the recording pitch of the magnetic head (transferring in the radial direction of the magnetic head) is less than or equal to the recording 1-rack width of the magnetic head.
Shoes: 1. Stability of ringing control and recording density - Extremely advantageous for measuring the stomach, and also for head adjustment if necessary. By reducing the 7-channel system by 2% and sequentially alternating the signal recording and reproducing operations, it is possible to record and reproduce without thinning out recording and without interrupting television video information. It has many features.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the main part of the method of the present invention, and FIG. 2 is a diagram recorded using the method of the present invention. Rack pattern to 1 of the signal to be reproduced, 1 of the first embodiment
- An enlarged view of a track pattern and a schematic diagram of an example of No. 48 being recorded and reproduced; FIG. 3 is an enlarged view of a track pattern of the second embodiment of the method of the present invention; FIG. 4 is an enlarged view of the main part of the method of the present invention. 1
A block system diagram of the embodiment, FIG. 5 is a signal waveform diagram for explaining the operation of the recording system in FIG. 4, FIG. 6 is a signal waveform diagram for explaining the operation of the m raw silk in FIG. FIG. 8 is an enlarged view of the track pattern of the third embodiment of the present invention, FIG. 8 is a block diagram of the second embodiment of the main part of the method of the present invention, and FIG.
Enlarged view of rack pattern to Example 1, Figure 10 and Figure 1
Figure '1 is an enlarged view of the track pattern of the fifth embodiment of the present invention and a modification thereof, respectively. DESCRIPTION OF SYMBOLS 1...Disc-shaped magnetic sheet (disk), 3...Magnetic head, 6...Moving coil mechanism, 22...Switching circuit, 24...Composition circuit, 29.30...
・Oscillator, 31, 33. 34... Preamplifier, 35・
... Game switching circuit, 37.38... Detector, 39... Tracking servo circuit, 52.54.
・Goo]・Circuit. 2 Gong ni 1 E Basigyo Tomoe

Claims (1)

[Scope of Claims] (1) A video signal is recorded every J3 desired frames (or (fields)) in one signal recording element, even if it is not received on a recording medium, and the video signal is recorded on 8 recording tracks. A video signal recording method characterized in that at least one reference signal is recorded in at least the first and second video signal non-recorded portions adjacent to each other. ■ A video signal is recorded every J3 desired frames (or fields). It is characterized by recording the entire video information without thinning out the video signal by arranging a plurality of the signal recording elements for recording and recording the video signal sequentially without any interruption in the plurality of signal recording elements. [Video signal recording system according to claim 1. (31) A head consisting of at least one magnetic head extending in the radial direction of the rotating magnetic recording medium at a speed synchronized with the rotational speed of the rotating magnetic recording medium. The three-dimensional object is transferred linearly to the magnetic head, and the racking control reference (No. 3) is alternately transferred to the video No. 53 and No. 1 in units of frame (or field) periods of the video signal. When sequentially recording on a medium, a 1-rack pattern is recorded and formed in which the recording pitch of the magnetic head in the radial direction of the rotating magnetic recording medium is less than or equal to the recording width of the magnetic head, and , Recording of the above-mentioned video@signal 1-Rack are recorded with horizontal same-bright signals aligned in the perpendicular direction of each track; A video signal recording method characterized in that the tracking control reference signal is disposed substantially on both sides of the track and is intermittently recorded in a portion corresponding to a horizontal retrace period of the video and signal. (4) A video signal is recorded every desired frame (or field) J3 by at least one signal recording element on the recording medium, and at least adjacent first and At least one reference signal is recorded in the second video signal non-recorded portion, and during reproduction, the reference signal is discriminately reproduced to generate a tracking control signal, and the control signal causes a signal conversion to perform a 1-racking control operation. A video signal recording and reproducing method characterized in that the video signal is reproduced on a device. (5) At least 51 magnetic heads are used to record and reproduce the video signal in units of frame (or field) periods of the video signal. tracking control reference signals are sequentially and alternately recorded on a recording medium, and the tracking control reference signals are recorded by the magnetic head from the recording track of the tracking control reference signal, which is arranged substantially on both sides of the recording track of the video signal. The tracking control reference signal is reproduced, and this reproduced reference signal J
A video signal recording and reproducing method characterized in that the video signal is reproduced by the magnetic head which is subjected to 1-racking control by a tracking control signal generated by the above. 6) At least one magnetic head records the video signal and the racking control reference signal 1 to 1 to the racking control reference signal alternately on the recording medium in units of frame (or field) periods of the video signal to form tracks in sequence. Of these, in the rack for recording the video signal 1, horizontal synchronizing signals are recorded side by side in the perpendicular direction of each track. A racking control reference signal is intermittently recorded in a portion corresponding to the horizontal retrace line m of the video signal, and the magnetic head causes the magnetic head to record the racking control reference signal. The tracking control reference signal Pj is generated along with the tracking control signal Pj, and the video signal is reproduced by the magnetic head, which is controlled from 1 to 4 by the generated 1-seat 4-ng control signal. A video signal recording and reproducing method characterized by: ■ A head assembly consisting of at least one magnetic head is linearly moved in the radial direction of a rotating magnetic recording medium at a speed synchronized with the rotational speed of the rotating magnetic recording medium. The image No. 15 and the racking control reference signals 1 to 1 are sequentially recorded on the rotating magnetic recording medium in units of frame (or field) periods of the image signal by the magnetic head. Of the tracks 1 to 1, the horizontal synchronization signal is parallel to the perpendicular direction of each track.
υ, and the recording track of the tracking control reference signal is substantially arranged on both sides of the recording track of the video signal, and in a portion corresponding to the horizontal retrace period of the video signal. A control reference signal is intermittently recorded, and the magnetic head reproduces the 1 to racking control reference signals together with the video signal, and 1 to racking control 1 generated from the reproduced reference signal.
No. 5 J: A video signal recording and reproducing method characterized in that the video signal is reproduced by the magnetic head which is subjected to retracking control.