JPS5974784A - Still picture recorder - Google Patents

Abstract

PURPOSE:To reproduce still pictures with a miniature and compact device, by recording the video signals of the 1st and 2nd fields with the 1st and 2nd magnetic heads respectively on adjacent and concentric tracks in each round. CONSTITUTION:The carrier wave sent from a reference signal oscillator 5 is supplied to a frequency modulator 8 and undergoes modulation of frequency by a luminance signal Y which is fed via an LPF7. Then a modulated luminance signal is applied to a mixer 10 via an HPF9. In this case, the output of the mixer 10 is switched by a switch 12 together with a luminance signal underwent modulation of phase separately by a record amplifier 11 in accordance with the 1st field or the 2nd field. Then these output and the luminance signal are supplied to a magnetic head h1 with the 1st field and a magnetic head h2 with the 2nd field and recorded on adjacent tracks T1 and T2 respectively. The horizontal synchronizing signals are recorded between the tracks T1 and T2 in each round of the track so that the record positions of these signals are arranged properly in the radius direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a still image recording device using a rotating magnetic disk as a recording medium, and more specifically to a frame still format high-density recording device that can be applied to a device using Kosei's rotating magnetic disk. It is related to the device. ' Conventionally, the use of magnetic disk devices has been attracting attention as a still image recording and reproducing method that allows video signals to be recorded magnetically and accessed randomly and in a very short time. There are two types of magnetic disk devices: digital recording and analog recording.Still image file devices that use the former have a number of disks that correspond to the number of heads in a disk pack, which is made up of a large number of disks with diameters of 350 to 130. Can write and read to the track simultaneously, 1
There is a device that allows you to switch between recording still images in the field or in frames, and Ryoya's slow motion video recorder for recording video signals uses a plated disk with a diameter of 200 to 350 fins. , reproduction can be performed at normal variable speed, freeze (stillness), etc. by one rotation of the disk and one field recording.

However, although these conventional devices are multi-functional and high-performance, they were developed with the assumption that they would be used as stationary devices, and they did not have a head feed control mechanism that was compatible with disks or disk packs, or a supply system for the head. There was no need to particularly consider miniaturization and compactness for both types of video signal switching.

Incidentally, in recent years, there has been a high demand for new recording technology that enables portability and compactness for such still image recording and reproducing devices.One of the new directions for the development of bottom VTRs is the application of IrL solid-state imaging technology. The usefulness of this technology has been recognized in the field of recording system development.

Therefore, the purpose of ``Misfire'' is to record a video signal of 17 L/-m, that is, 2 fields, at a density of 17 L/-m, which can be applied to a rotating disk in a shed, and to reproduce a frame without deterioration of vertical layer image quality. It is an object of the present invention to provide a still image recording and reproducing device capable of producing still images.

The structure of the still image recording device according to the present invention which achieves the above object is to record a carrier luminance signal, which is formed by adding a carrier wave in frequency to a luminance signal of a video signal, on a rotating magnetic disk by adjusting the azimuth between adjacent tracks. The chromaticity signal in the video signal is obtained by phase modulating the chromaticity carrier signal obtained in synchronization with the rotation of the rotating magnetic frequency disk, and converting this phase-changed skin color signal into the above-mentioned rotation. In a device that performs recording so that the phases of the carrier waves I and M are aligned in the radial direction between the instantaneous contact tracks of the magnetic disk and the recording positions of at least the horizontal synchronization signals are aligned, the center of each head gap is in the radial direction of the magnetic disk. two mountain-side heads that lie on a straight line, have gaps at different azimuth angles with respect to the straight line, and are arranged adjacent to each other in the radial direction, and store information signals for at least l fields of the video signal; A storage means that can be read at any timing, a delay means that delays by a predetermined m for each field, and a switch V that switches between the two heads for each field.
+ stage, by switching the signals corresponding to the first field and the second field of the video signal to the above-mentioned field, or by giving a delay to either field signal at the so-called head input point freezing. The recording start points of the two fields are relatively different by 1/2 horizontal scanning period, and the video signal of the first field is
This magnetic head is characterized in that the image η of the second field is recorded by the second magnetic head in each one round of the adjacent concentric trunks.

One embodiment of a still image recording device according to the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing the relationship between a rotating disk and a magnetic head of a still image recording apparatus according to the present invention. In the figure, l# is the rotating magnetic disk, h, , h2 is the minute gap d
first and second magnetic heads arranged in parallel with g
t, gt are the gaps between the first and second magnetic heads h1h, θ1. θ, is the gap g1 and g! azimuth angle with respect to the radius, where θ1=-02. It is desirable that the value of the distance d be as small as possible in order to increase the recording track density. Specifically, for example, when a composite head consisting of two heads is constructed using a thin film head, O i'
l r T2 has two magnetic heads b1. M+2 tracks are recorded concentrically by h2, Tp is an auxiliary track on which the reference phase signal is recorded, and hp is an auxiliary track 'rp.
H indicates the position of the horizontal synchronizing signal, and V indicates the position of the vertical synchronizing signal. During recording, as shown in Figure 3, the carrier wave from the reference signal oscillator 5 is input to the frequency modulator and passed through the low-pass filter. LP
The frequency is modulated by the luminance signal Y inputted through F7, and the modulated luminance signal is applied to the mixer lO via HPF9, and the separately phase-changed chromaticity signal (along with No. 8 is added to the recording amplifier 1).
1, the field is switched by the switch 12 according to the first or second field, and the first field is supplied to the head h1, the second field is supplied to the head h2, and recorded on the adjacent track ri,T.

Adjacent track T1. Between T and T, the positions where at least the horizontal synchronizing signal H are recorded are aligned in the radial direction, and are recorded over one round of each track. In the case, the horizontal synchronization frequency mark and the vertical synchronization frequency fV
If the number of lines in the running is 'ftN, then fn=4vx''
/ There is a relationship. As shown in Figure 2, the horizontal period (+
The phase of No. 4 and the vertical synchronization signal are 2H different in phase between the odd field and the audience field.
When the second field is recorded 1111 times on each track, there is a horizontal opening between the tracks. Therefore, in order to line up the horizontal synchronization signals between tracks, it is necessary to delay the video signal of the second field by 1/2 horizontal synchronization.

By the way, in recent years, a solid-state imaging device with a two-dimensional array has been developed, and this device has a memory function similar to that of a charge-coupled device COD, and the first and second fields are imaged with the same exposure, and reading them is a painless process. Therefore, when used in the present invention, the readout of the second field may be made the same as that of the first field in order to line up the synchronization signals between tracks, but it is extremely simple in terms of the circuit as follows. 0, that is, the readout of the first field is delayed by /22 horizontal scans, but the readout of the second field is left unchanged. By doing this, the horizontal synchronizing signals are aligned between tracks, and the -41α synchronizing signal G3 is shifted by 14 horizontal scanning periods, but this is no problem at all. In this way, the circuit can be simplified by simply delaying only the second field by 22 horizontal scans during reproduction.

FIG. 3 shows a circuit diagram for recording according to the present invention.
In the 8IN3 diagram, the luminance signal Y is a switching pulse P generated by the vertical synchronizing signal V-8YNC at the time of input.
Under the control of SW, in the first field, 1/2 horizontal scanning period delay line 1/2 HDL, in the second field, l
/2 Direct low pass filter LPF7 without going through HDL
It is supplied to the frequency position rJA circuit 8 via. The frequency modulation circuit is supplied with a carrier wave having a reference frequency I from the reference 4a oscillator 5, for example, a carrier wave of fY=&03 MHz, and is frequency modulated by the luminance signal Y. The frequency-modulated luminance signal passes through a bypass filter 9 and is mixed with a modulated chromaticity signal in a mixer 1O, and is then sent to a recording intensifier 1.
1, if the first field is the first magnetic head h
If it is the second field, the field is supplied to the second magnetic head h2 by switching the switch 12 in synchronization with the V-8YNC described above, and adjacent concentric recording is performed on the rotating magnetic disk.

On the other hand, the chromaticity signals R-Y and B-Y pass through low-pass filters LPF13 and LPF14, as shown in FIG.
The signal is input to the 4-unit 16. There, the reference frequency ILi on the auxiliary track 'vp is input to the phase comparator 4, and the VCO is set to oscillate a signal synchronized with the rotation of the two rotating magnetic disks.
A carrier wave that phase-modulates the chromaticity (rN) is inputted through the y/n frequency divider 15 and phase-modulated by the quadrature two-phase modulator 16. The two modulated chromaticity signals are combined, and like the luminance signal, the first field passes through 1/2 HDLt-, and the second field directly passes through the LPF 17 and then is added to the mixer 10, and is sent to the recording amplifier 11 together with the luminance signal. sent to.

A more detailed circuit diagram of the quadrature two-phase phase modulation-74Wt16 in FIG. 3 is shown in FIG. In FIG. 4, chromaticity No. 16 it-Y and B-Y are input to balanced modulators 18 and 19, respectively. On the other hand, the reference signal reproduced from the auxiliary track Tp is sent to the balanced modulator 18 and 19. The carrier wave signal obtained through the frequency divider 15 is input to the phase shifter 20, and -5
ina+ct, cosωct.

sin ωct, and as shown in FIG. 4, the balanced modulator 1
8.19 and also inputs to the adder j'f unit 21.22 to adjust the phase by f. f
By inverting and synthesizing the H signal for each horizontal scan, a composite wave of chromaticity signals with quadrature two-phase modulation is obtained. 1
7 and output to the mixer lO.

In the recording of chromaticity signals according to the present invention, two chromaticity signals are transmitted by one carrier wave by phase shift and α angle phase synthesis, and are recorded on the first and second trunks that are in contact with the elbow. The carrier wave of the composite chromaticity signal has a phase difference between adjacent tracks, and the phase modulation index is maintained at 13 or less.

When recording on a rotating magnetic disk, etc., as mentioned above, there is at least a horizontal line between adjacent tracks in the radial direction.
The reason why the modulation index is selected to be less than L3 in the phase modulation recording method in which the recording positions of the first and second numbers are arranged and the position of the carrier wave signal is distributed between adjacent tracks is as follows. RIJ, the phase modulated wave is carrier wave Jo
and upper and lower 1111 band waves J1.
J2. When the sum of J, ... is determined by the Bessel function, and the variable W-index is less than L3, the amplitude of the carrier wave itself does not change significantly between tracks, and the phase also changes from JM.
Also, since sideband components of second order and above can be ignored, even if the adjacent tracks are played back together, the output will only be the sum of the composite vectors of No. 48 from both tracks, and This is because the conditions are such that beat disturbances due to crosstalk from the track do not occur.◎ In the above embodiment, 27 slow lines for the luminance signal and the chromaticity signal are used to control the recording timing. n; As mentioned above, the video signal is transferred to a CCD.

2D solid-state imaging device with 1D function of MOS board
In this case, the two 1/2 FIDL circuits controlled by the V-8YNC shown in FIG. and delay 2 horizontal scanning periods,
The second field is read out as it is and the signal obtained is sent to the third field.
Figure Y, R-Y.

Just supply it to the B-Y terminal.

Next, a case will be described in which a still image is reproduced from a video signal on a magnetic disk recorded in 5K. FIG. 5 is a circuit diagram for reproduction. The configuration and arrangement relationship during reproduction of the first and second magnetic heads placed on the rotating disk l are the same as in the case of recording shown in FIG. 1. Therefore, the first magnetic head h is placed on the first track T1. The second field head J receives the video signal of the first field from the second field.
The video signal of the second field is reproduced from the track. In FIG. 5, when reproducing the video signal of the first field by controlling switch pulses synchronized with the V-8YNC signal, the switch 25 is set to the side 1 of the first magnetic head so that the signal is obtained from the first magnetic head; The luminance signal of the video signal that is sustained and reproduced in the second field is passed through the bypass filter IIP.
F26. Amplifier 27. FM demodulator 2 via limiter 28
9, demodulated, and output through a low-pass filter LPF 30'. The brightness (g) is frequency modulated and recorded on adjacent tracks, but during recording, it is recorded with a magnetic head that is arranged at a radius of fY is &0
Since it is as high as 3Mf (Z), crosstalk does not occur with each other.

Next, the color p, (as for the signal, in FIG. 5, it passes through the LPF 40 and is directly input to the 7JII n circuit 42 and the subtractor 43, and the other one is input to the delay circuit 1L- which gives a delay between 1 horizontal synchronization sU. 11) It is input to the adder 42 and subtracter 43 via L41'5c. The output of the adder 43 is input to the synchronous detector 44, and the output of the adder 42 is input to the synchronous detector 45. However, the reference No. 48 reproduced from the auxiliary track Tp passes through a bandpass filter BI'F34, is divided into 4 by a frequency divider 35, is inputted to a phase comparison circuit, and is compared with the phase of the output signal of the VCU 36.The starting frequency of vCO is set to the rotational phase of the rotating magnetic disk. The same Jυ'' is generated as a carrier wave (f1) and input to the phase shifter 3B.The phase shifter 38 is
nωct.

A signal of cnsa+ct is output, and the polarity of 5islo)ct is inverted to 1/2fH4σ by the inverter 39, and the same signal J
Input to the detector 44 and synchronous detection -f, cosωc
The signal of 1 is input to the synchronous detector 45 and synchronously detected, and the signal of 1 (-7 number and 13-Y
Samurai the signal, each number 16: low pass filter 46
．． 47 to field 11, 1 field is inscribed in 21, and the second field is delayed by 1/2 horizontal scanning period and output. Two chromaticities, 1 and 1 are phase. Two tracks T are modulated and i internal angle phase synthesized to l/i Jλ3.

'r2 with a variable azimuth, and between adjacent trunks, carrier waves of composite chromaticity (II) are recorded in the same phase in the radial direction of the two rotating magnetic disks. By keeping the level below 3, the reproduction signal between the tracks connected to the AC is suppressed by harmonics higher than 1-J-(lit), and again the E(Q has the carvings of both class tracks). ◎In this way, during playback, the 9-color signal (i) is
For all of No. 4, the video signal of the second field should be output with a delay of /2 horizontal running period.

In the above embodiment, the i+2 recording method of the chromaticity signal is obtained in synchronization with the rotation of the rotary disk.] The carrier wave for the chromaticity signal, which is one-third of the N quasi-signal, is quadrature two-phase phase modulated. These two composite variables i! There was a method for recording IAI IFf numbers, but it is not limited to this, and for example 61
μs first-order special phase modulation, that is, with the balance degree d and the displacement a W par 4 method, recording on the track of TJ) 1 by the first recording head is CR(t) = ±[Acosωct −A
kRfIi Y(t) sinract J signal to lH
The second track recorded by the second head is CB (t) = (Asina + ct).
+AkBfB Y'(t) cosωct J signal may be recorded. (Refer to Figures 6 and 7) However, in the above formula, CB (t) is the two color difference signals fRY
(t), fB
A signal obtained by phase modulating ωct with a balanced modulator is shown. If this recording method is adopted, the effect of preventing crosstalk between the brightness Y signal and the brightness Y signal in the low frequency region is great in this apparatus in which the brightness signal Y is recorded in FM azimuth. Here, we will explain the actual Alu example shown in Figure 6 and SrI2 diagram.
FIG. 6 is a block diagram showing an example of the n1 recording system. In the same figure, a pulse generator 9 for switching the 51/fi switch generates an on/off switch 11J in synchronization with the horizontal synchronizing signal Hsync. 520i color A, °1
It is a switch for switching the number, and when the 1st pulse P toe is turned on, it is 5 It -Y color 7'' 1. It takes in the Tomoe J number, and when it is off, the low Y Tomoe signal is sent to the J■p included signal, This outputs color pressure No. 15 C which has been made into a quaternary line. 53 is an equilibrium change B1
Phase change using M device 13Mf! The auxiliary gear rear CWs is operated by switching from the phase switching switch 54 to cosωct and sinωct for 1 horizontal travel 1σ.
) W + converted color (t + phase modulation with C - j" 6. In addition, the 44411 circuit of 53 af ma 27 () ha (). Also, the frequency of the g recarrier is the water 1' scanning frequency If uncle is fH, the example is '8fH (75 (ikHz)
That's about it.

1j change A” Output of A unit 53 CC/liC/l
Pass filter P 1”) 55 t-41 Tei JIW
, Ir, It W? 't 56 te transporti 4 l'L
11□+jCy, multiplied by Jν1 in the amplifier 57, and alternately supplied to the two video heads 58 for each track. Ru. 6° is a motor that moves the magnetic disk 59 by IVrs.

Conveyance brightness No. 16 cy fJ, iJ43 diagram and Mr. 1 Tsukasa's 1
・゛M method makes me cum. 1^1j Carrier CWs is based on a frequency generator (FG) 61 that generates a frequency synchronized with the rotation of the motor 60, and is based on an m-voltage oscillator (V C
O) 62a.

A switch 54 switches between cosωct and sinωct generated by a subcarrier generator 62 including a frequency divider 62) and a phase detector 62G.

FIG. 7 is a block diagram showing an example of the F51A= system,
The reproduction signal of the two video heads 58 is outputted to a bypass filter (HPF) 73 and a low-pass filter (LPF) 7, with the reproduction signal selected by the switch 25 corresponding to the track.
The carrier luminance signal CYii is separated into a carrier luminance signal CY and a carrier chrominance signal CC by a known I''M demodulator 8.
The luminance signal YK is demodulated by 8. On the other hand, the carrier color signal C
After AM noise is removed by a CH limiter 75, the signal is demodulated by a balanced modulator 76. The fourth standard information Sp required for demodulation here is obtained as follows. That is, the synchronization separation circuit 77 separates the horizontal 1st eye 1st period signal 1 (sync) from the luminance signal Y that has been damped to Pulse PGf: Create and use the gate 79t only when this gate pulse I'() is on to send the general color feed signal CC
The W, 7X, and key A1) are given to the APC circuit 80. APC circuit 80tj: phase comparator 8081 phase compensation circuit 80b and voltage side (I'l1 oscillator (V CO
) 80c, please select the time determination of the phase complementary circuit 80b appropriately, and input heat level 11! l (
While the if signal alternately takes a pressure of 6 gr per horizontal scan and a phase of 90 degrees, a carrier of the same frequency is generated with a phase of 45 degrees in between. -t where APCl path 80
A signal (co
smct) and further delayed by 90 degrees using a phase shift circuit 82.
The phase reference (rj signal S
Get P. The switching of the switch 83 is performed by the output of the phase comparator 80a. The level of the output of the phase comparator 80a changes every time the phase of the lamp modulation signal changes, that is, every l horizontal scanning time (ill). Therefore, since the switch 83t- and tl are ports that are switched every horizontal scan, they are connected to the delay circuit 85 and 2 for one horizontal scanning time.
Two switches 86.87 and two color differences No. 48 1t-Y
, B-Y. In this case, both switches 86.87
In both cases, the contacts change every horizontal scan, and one switch 86 first captures the pre-delayed signal and later captures the delayed signal, thereby supplementing the portions missing during recording due to sequentialization. Obtain the y color difference signal. The other switch 87 performs the opposite operation to obtain a B-Y color difference signal that also complements the missing portion. Each switch 86.
The operation of the APC circuit 87 is as follows: It-Y and B-Yf: can be separated without confusion ◎ The luminance signal Y and the two color difference signals R reproduced as above.
-Y and B-Y are directly output when the first field is reproduced, and are output after being delayed by 1/2 horizontal scanning period when the second field is reproduced.

Here, the reason why the phase difference between the subcarriers CWs is set to 90 degrees will be explained. If the heat rA signal input to the APC circuit 80 has a different phase to xH(σ, the l of the phase comparator 808
) i force differs for each 111, but by appropriately changing the loop gain and the time constant of the phase compensation circuit 80b, it is possible to make the phase of the V CO output intermediate between the two phases of the unmodulated signal. can.

In other words, as in the A1C circuit in the PAL system, the phase of the VCOd force is adjusted to match the average phase of the burst carriers whose phases differ by 90 degrees from each other. The average value of degrees is 45 degrees. However, if the phase difference between the carriers is larger than 90 degrees, the level difference between the outputs of the phase comparator 80b becomes too large and the phase of the vCO output becomes unstable.On the other hand, if it is smaller than 90 degrees, the accuracy of the phase comparison becomes poor. The VCO output is 4f.
Since the J accuracy is also poor, it is desirable that the phase difference be around 90 degrees.

According to the still image recording device according to the present invention, two Heradra magnetic disks are arranged on a straight line in the radial direction, and the traps are arranged face-to-face with each other so that the gaps have different azimuth angles, and the first and second magnetic disks are When recording with the head, the first magnetic head can record the eRl field and the second magnetic head can record the second field in sequence. From the first magnetic head, by moving the head, it is possible to perform two-field recording and reproduction. The moon sending old 14 is simplified. Also, the luminance signal is changed to azimuth FM, and the chromaticity signal is changed to the 1st. Between the tracks corresponding to the second field, change the phase so that at least the phase of the horizontal synchronization signal and the center carrier are aligned (4) Since the vertical phase within the frame is recorded and played back There is no effect of talk replacement, so picture 5'Jf:
It is possible to almost eliminate the guard band between the tracks corresponding to the first field and the second field without any damage9.As a result, the trunk density can be increased and the diameter of the magnetic disk itself can be reduced by Kj after 45 ifnor, for example. It becomes possible to reduce the As the diameter of magnetic disks becomes smaller and we approach card bandless recording, it becomes necessary to strictly control horizontal synchronization (Fi alignment) between tracks. In order to achieve this, the above-mentioned solid-state image sensor is equipped with the ability to capture and store one frame's worth of still image information with simultaneous exposure, and read it out in l-field units at arbitrary timing. , can be achieved very conveniently, so even if a small and compact magnetic disk device is used,
It is now possible to create a recording system that achieves frame still playback, which does not blur even when shooting fast-moving screens and has vertical resolution that is approximately twice as good as field stills. Furthermore, since the chromaticity signal is recorded and reproduced using the above-mentioned phase modulation method, the occupied i-field does not expand, and by removing level fluctuations that occur in the electromagnetic conversion system with a limiter, it is not affected by AM noise. , the reproduced color signal will be good.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating the relationship between the rotating G-speed disk and the magnetic head of the still image 69 recording device according to the present invention, FIG. 2 is a circuit diagram of the device in the current television system, and FIG.
The figure is a schematic diagram of a circuit 47 of a quadrature two-phase phase transformer, and FIG. 5 is a rotation a1 recorded by the still image recording device according to the present invention.
7 is a circuit diagram showing another embodiment of the chromaticity signal recording unit of the still image recording device of the present invention. FIG. 7 is a circuit diagram showing mainly the chromaticity signal portion when reproducing data from a magnetic disk after recording with the configuration shown in FIG. In the figure, l is a rotating magnetic disk, 3 is a switch, 4 is a phase comparator, 5 is a base signal oscillator, 6 id V CO
llI type UJI+Q D ), 7.13. ]-413
0, 46, 47 are low pass filters (L)) F)
, 9 FJ, bypass filter, 20 #i mixer, 11rIi recording j' + f rIJ device, 12 is switch, 15 is frequency divider, 16 is right angle 2411 phase changer, 18, 19) or balance liquid + 11 device , 20 #i shifter, 21.22, 24it addition Jγ device, 23.39 is an inverting circuit, 25Fi is a switch, 26 is a bypass filter, 27 is an amplifier, 28 is a limiter, 29 is an FM restorer. 34 is a band pass filter, 35 is a frequency divider, 36 is VCOl 3711.tiXl, phase comparator, 38 is a phase shifter, 4 is IHDL. 42 il: lJn calculator, 43 is a subtracter, 44 .45 is a synchronous detector, 52 is a color signal changeover switch for line sequentialization, 53 is a phase modulator using a balance-4 unit (BM), and 56 is a carrier luminance signal Cy and a phase modulator power Cc. 57 is a Nf2 Shikakunoso II 4 device, Psw is a changeover switch that is switched every on-duty scanning period, 58 is a Haru 8ki head, 59 is a rotating magnetic disk, 62 is a chromaticity signal sub Carrier wave signal (CWs) generator, 761 Equilibrium change)) jl = P = 4 dimensions = 4 report same book j- (To the first issue of this issue 88
1\4 demodulation circuit for luminance signals, 77 a horizontal synchronization signal separation circuit, and 80 an automatic phase fl+I)# circuit (A I'C), respectively. 1 Samurai Applicant Hitoji Photo Film Co., Ltd. Representative Patent Attorney Hikaru Ishibe (1 person)

Claims (1)

[Claims] The carrier luminance (number i) obtained by frequency modulating the carrier wave with the luminance signal of the video symbol is recorded on the rotating magnetic dinuks with different azimuths between adjacent tracks, and the chromaticity signal in the video symbol (number 8) is The chromaticity conveyance obtained in synchronization with the rotation of the disk (i4 is phase-adjusted with the chromaticity signal, and this phase-modulated modulated color signal is transferred between the instantaneous contact tracks of the rotating magnetic master disk at its radius) In a device that records data so that the phase of the carrier wave signal is aligned in the direction and the recording positions of at least the horizontal synchronizing signal are lined up, υ in each head gap is placed directly on one side of the magnetic disk in the radial direction, and the straight line , two sliding heads arranged adjacent to each other in the radial direction with different inclinations f1 and azimuth angles 7ZL and information No. 48 for at least one field of the video signal are stored and output one after another at arbitrary timing. the first field, the second field of the video signal, and a delay means for delaying a predetermined i for each field; and a switching means for switching between the two heads for each field;
91 by changing the read timing from the storage means for each field.
Preferably, by delaying one of the field signals by the time the magnetic head reaches a certain point, the recording start points of the two fields are relatively different by 1/2 horizontal scanning distance. Still image recording characterized in that the video signal of the field is recorded by the first magnetic head, and the video signal of the second field is recorded by the second magnetic head for one round each of the concentric tracks that are in momentary contact. Device.