JPS63276390A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a picture from being disturbed even at the time of special reproduction by recording a video signal of one field in plural tracks and outputting signals from 1st and 2nd magnetic heads with a different azimuth angle via a storage means respectively. CONSTITUTION:An output signal of a reproducing head HB1 on a head actuator 21 is given to a reproduction amplifier 23 and a low pass filter 24 and a reproduced pilot signal is fed to a balanced modulator 25. A video signal is written in a storage means 36 or 37 via a high-pass filter 33, an A/D converter 34 and a switch 35. The video signal written in the storage means 36, 37 is outputted via the switch 35 and a D/A converter 39. The switching control of the switch 35, the read/write control of the storage means 36, 37 and the address designation are executed by a memory control section 38.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a segment recording type magnetic recording/reproducing apparatus in which one field of video signals is divided into a plurality of tracks and recorded.

2. Description of the Related Art Conventionally, a helical scan type magnetic recording/reproducing device (hereinafter referred to as a VTR) has a pair of heads mounted at 18o0 opposing positions on a cylindrical head drum at different azimuth angles, and a running magnetic tape. wrapped in a helical shape of 1800 or more around the rotationally driven head drum,
The video signal is reproduced from the recording medium by moving the head in contact with the running magnetic tape in the diagonal width direction.

When performing special reproduction by running the tape at a speed different from that during normal reproduction, if the recording head is used as is, the head output will decrease due to the difference in azimuth, resulting in a significant deterioration in image quality.

In order to prevent image quality deterioration during playback, tracking servo using a 4-frequency pilot is performed for 8 mm video.

FIG. 14 shows the configuration of the head. Rotating head drum 16
Recording and reproducing heads HA1 and HA are placed at positions opposite 18o0.
2 is attached. Similarly, special reproduction heads HB1 and HB2 are attached at positions 180° opposite to each other. HAl/HB2 is mounted on the head actuator 2, and HA2/HBl is mounted on the head actuator 1.

HAl and HA2 have different azimuth angles, and HA
l and HBl have the same azimuth, and HA2 and HB2 have the same azimuth.

The video track 3 formed on the magnetic tape 4 by the recording/reproducing heads HA1 and HA2 is as shown in FIG. Here, each video track 3 has pilot signals f1°12, f3 . f4 is f, →
The signals are superimposed on the video signal and recorded on each track in the order of f2→f3→f4-f1. FIG. 16 shows a block diagram of the playback device. In the case of 8mm video, the pilot signal f1. f2. The frequency of f3°- is determined as follows. (fH is a horizontal synchronization signal and has a frequency of 15.7 KHz.) Since the pilot signal is a relatively low frequency signal, the pilot signal recorded on the adjacent track is also reproduced as crosstalk. For example, 2A in Figure 15)
When the head scans the rack for reproduction, f, , f2 . f
A composite signal of 3 is reproduced. This combined signal and a reference pilot signal (a signal with the same frequency as the pilot signal recorded on the main scanning track) are balanced-modulated to extract a signal with a difference frequency.

This process will be explained using FIG. 16. The reproduction output of the recording/reproduction head HA2 is amplified by a reproduction amplifier 6, and then passes through a low-pass filter 7 to obtain a reproduction pilot signal. This regenerated pilot signal includes fl, f2. The balanced modulation circuit 8 performs balanced modulation on the signal at the frequency f2, which is the output of the reference signal generation circuit 9, and the reproduced pilot signal to generate a signal at the sum frequency l f1.
+ f21 , l f2+f21゜lf3+f21 and difference frequency signal l f 1-f 21 t I f 2-
f 2+.

1 ball. A signal of -121 is obtained at the output of the balanced modulation circuit 8. Among these, the frequency amount H component, that is, 1f1-12
1 is amplified by a tuned amplifier 10 and input to a transverse wave generator 12. Also, frequency 3 component.

That is, 1f3-f21 is amplified by the tuning amplifier 11 and input to the detector 13. A level signal corresponding to the amplitude of the signal of frequency fH is output to the detector 13.
outputs a level signal corresponding to the amplitude of the signal with a frequency of 3fH, and these two output signals are supplied to the differential amplifier 14. Here, if the scanning locus of the recording/reproducing head HA2 deviates to the right from the track 2A, the reproduction pilot signal f3 increases, and conversely, if it deviates to the left, the reproduction pilot signal f1 increases, so the output of the differential amplifier 14 changes the scanning trajectory. The direction and amount of deviation can be detected. In addition, in the track 3A, since the relationship between the pilot frequencies on both sides is reversed, an inverted signal is inputted to the capstan control circuit 102 through the switch 100 using the inverting circuit 101, so that the phase of the capstan motor 103 is is controlled so that the head trajectory scans the track to be reproduced.

Next, mistracks such as track curvature that cannot be tracked by phase control of the capstan motor are tracked by the head actuator 1 composed of a piezoelectric element or the like. That is, the trunking error signal obtained from the output of the differential amplifier 14 is input to the piezoelectric element drive circuit 15, and the recording/reproducing head HA2 is displaced in a direction perpendicular to the head scanning direction by the tracking error signal corresponding to the track music. Make it follow the song.

Another advantage of this head actuator is that it can perform noiseless special playback. For example, when reproducing the video track shown in FIG. 15 at 7x speed, the recording/reproducing head HA2
Figure 17 V for scanning trajectories T1 and T2 of fist T5-T7
Head actuator 1 as in 1@V3/Va-Vryo
By displacing the head actuator 2, the head actuator 2 is displaced as shown in FIG. By doing so, it is possible to achieve noiseless slow playback in the same way as the track locus 6.

Problems to be Solved by the Invention In the head actuator system described above, when one field of video signal is recorded on one track, the head is swung at a width of 2.25 track pitches as shown in FIG. There is a need.

However, during segment recording in which one field of video signals is recorded on four tracks as shown in FIG. 18, it is necessary to increase the maximum deflection amount of the head actuator.

The recording tracks shown in FIG. 18 are formed by rotating the rotary head drum 16 shown in FIG. 14 at four times the normal rotation speed, and recording one field of video signals divided into four tracks. Considering the continuity of one field of images, the head scans T1, T2, and
It is necessary to set T3 and τ4 to head scan S 1-32-33-84), head actuation, x-t1.2 (7) displacement ■1, ■211■311v4, as shown in Figure 19. . Therefore, the amount of deflection of the head actuator is 5.25)
This will be a rank pitch.

When the bed actuator is realized with a piezoelectric element, the maximum displacement is proportional to the effective length of the actuator, but since the effective length is limited by the diameter of the rotating head drum, there is also a limit to the maximum displacement. Depending on the conditions of the two-rotation head drum diameter and track pitch, slow playback may be difficult. Furthermore, since the amount of head deflection is proportional to the voltage applied to the actuator, increasing the amount of deflection means applying a high voltage to the actuator, which poses the problem of requiring a high voltage power supply and transistor. .

In view of the above, the present invention provides a magnetic recording and reproducing apparatus that realizes slow playback by reducing the maximum value of the swing width of a head actuator in a segment recording mode in which one field of video signals is divided into multiple tracks and recorded. The purpose is to provide.

Means for Solving the Problems In order to achieve the above object, the magnetic recording and reproducing apparatus according to the present invention includes first and second magnetic heads having mutually different azimuth angles mounted on a rotating drum at 1800 opposite positions,
Track patterns formed by the first and second magnetic heads are alternately formed obliquely in the longitudinal direction of the tape on a running tape, and one field of video signal is divided into M tracks (M is an integer of 2 or more). A magnetic recording/reproducing device for recording data, comprising: an A/D converter that converts a reproduced video signal from the first or second magnetic head into a digital value;
A first storage means and a second storage means for storing reproduced video signals converted into digital values, and a memory for controlling reading/writing and specifying addresses of the first storage means and the second storage means. a means control device;
It has a D/A converter that converts the video data read out from the storage means or the second storage means into an analog signal, and when the Kth field is reproduced, the reproduced video signal of the Kth field is converted into the analog signal. /D converter converts it into a digital value, and the storage means control device writes it into the first storage means set to write mode, (K+1
) When reproducing the (K+1)th field, the reproduced video signal of the (K+1)th field is converted into a digital value by the A/D converter, and the second storage is set to a write mode by the storage means control device. The video data written in the storage means and read from the first storage means set in read mode is converted into an analog signal by the D/A converter and output as an image.

Effects of the Invention With the above-described configuration, the present invention can provide reproduced video without image disturbances not only during normal playback but also during special playback.

Embodiments Examples of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a circuit block diagram of a first embodiment of the present invention. Further, FIG. 2 shows the configuration of the magnetic head. A pair of recording and reproducing heads HA1 and HA2 with different azimuth angles are attached to 18o0 opposing positions of the rotary head drum 2o, and a pair of reproducing heads HB1 and HB2 with different azimuth angles are attached to respective rad actuators 21. .18 of rotating head drum 2o mounted on .22
They are mounted at positions facing each other at 0°.

During recording, one field of video signals is divided into four tracks and recorded by the recording and reproducing heads HA1 and HA2 as shown in FIG. 3, and pilot signals f1. f2. f3. f
4 is recorded superimposed on the video signal. Pilot signal f1. f2. Each frequency of f3°I4 is as explained in the conventional example.

If the tape speed is set to - for normal playback and 1x playback is performed, the scanning trajectory of the playback heads HB1 and HB2 will be T1 to T1 in Figure 3 unless the head actuator is driven.
12' If the head output obtained at this time is directly used as a video output, a proper image cannot be obtained.

In Figure 1, after the output signal of the playback head HB1 on the head actuator 21 is amplified by the playback amplifier 23,
The regenerated pilot signal is supplied to a balanced modulator 25 through a low-pass filter 24 .

Balanced modulator 26. Tuned amplifier 2, 28, detector 29.
30 and differential amplifier 311 inverting circuit 1o4° switch 1
Reference numeral 06 constitutes a tracking error detection circuit, which detects a deviation from a track to be reproduced using a pilot signal recorded on each track. The piezoelectric element drive circuit 32 controls the deflection direction and deflection amount of the head actuator 21 according to the tracking error signal output from the differential amplifier 31.

A video signal obtained through the bypass filter 33 out of the output of the reproduction amplifier 23 is supplied to the A/D converter 34. The video signal converted into a digital value by the A/D converter 34 is written into the storage means 36 or 37 selected by the switch 36. At the same time, the video data of the previous field written in the storage means 37 or 36 as video output is transferred to the D/A through the switch 35.
The converter 39 converts it into an analog signal and outputs it. Here, switching control of the switch 36 and storage means 36.
Read/write control and addressing of 37 are performed by a memory control device 38.

The system microcomputer 40 selects track N using the field switching detection signal indicating field switching and the H-3W signal indicating track switching.

is determined, and the reference pilot signal generator 26 and switch 105, which are input to the memory control device 38 and the balanced modulator 25, are controlled by the track 0.

The operation of the slow playback circuit shown in FIG. 1 will be explained using FIGS. 3 and 4. FIG. 3 is a portion of the tape pattern shown in FIG. As shown in FIG. 6a, one field consists of four tracks, and a pilot signal is recorded on each track in the order fl-f2-f3→i4, superimposed on the video signal. Figure 3 shows the first and second fields.
After writing out the fields, T1-T16' indicate head scanning when the head actuator and the rear are not driven during single-speed slow playback. System microcomputer 40 in Figure 1
As shown in FIG. 6), the track being scanned by the head is determined based on the field switching detection signal indicating field switching and the H-3W signal in FIG. The track number data output from the system microcomputer 40 controls the reference pilot selection circuit 26 that selects a reference pilot signal to be input to the balanced modulator 26, and also controls the memory control device 38. The operation will be explained below. First, the first field is recording track 1A/1.
The second field consists of recording tracks 2A, 2B, 2C, and 2D. Recording track 1A
・1C, 2A, and 2C are recorded by the recording and reproducing head HA1, and the azimuth angle is in the R direction. Also, recording tracks 1B, 1D, 2B, and 2D are recorded by the recording and reproducing head H.
A2, and the azimuth angle is in the L direction. -Head actuator 21 with double speed slow playback.
When 22 is not driven, the head scans of the special playback head HB1 are T1, T3, T5..., and the head scans of the special playback head HB2 are T2, T4, T6...
...becomes... The special playback head scans track 1A four times (T1 to T4), system microcomputer 40
Data indicating track number=1 is outputted from the reference pilot selection circuit 26 and the memory control device 38. In the reference pilot selection circuit 26, track N0=
1, a positive pilot signal is input to the balanced modulator 25. During head scanning from 1 to T4, in addition to the pilot signal f1 recorded on track 1A as the output of the low-pass filter 24 in FIG. 1, pilot signals f4 and T2 are included as crosstalk from adjacent tracks. The output of the balanced modulator 25 includes a regenerated pilot signal f
Signal 1 of the frequency of the sum and difference of 4・fl・T2 and reference pilot signal f1 f4+f11 p l 14-fl
l * l positive, -+-f11゜Ifl-fll, lf2
+f11, 1f2-f, l are obtained.

The frequencies of pilot signals f1, T2, T3, and T4 are determined as follows. (f is a horizontal synchronization signal of 16.7KHz
It is. ) The tuned amplifier 27 outputs a component of frequency f)i, i.e. 1f2
-fll is amplified and input to the detector 29.

The tuned amplifier 28 has a component of frequency sfH, that is, 1f4.
-fll is amplified and input to the detector 3o.

The detector 29 outputs a level signal corresponding to the amplitude of the signal of the frequency component of the frequency iH, and the detector 30 outputs a level signal corresponding to the amplitude of the signal of the frequency component of the frequency 3fH.
A level signal corresponding to the amplitude of the frequency component signal is outputted, and these two output signals are supplied to the differential amplifier 31. Therefore, when the head scans T1 and T3 deviate to the right from the recording track 1A, the pilot signal f2 increases in the reproduction output of the reproduction head HB1, so that the balanced modulator 2
The amplitude of the signal with the frequency component of 1f2-fll output from the differential amplifier 31 increases, and the level of the tracking error signal output from the differential amplifier 31 increases, which is input to the piezoelectric element drive circuit 32 through the switch 105. The head actuator 21 is driven so that the head locus of the reproducing head HB1 moves to the left. Head scanning T2/T
4 is shifted to the right from the recording track 1A, the same process is performed and the head actuator 22 is driven so that the head locus of the reproducing head HB2 moves to the left.

Conversely, when the head scan TI-T3 deviates to the left from the recording track 1A, the pilot signal f4 increases in the reproduction output of the reproduction head HB1, so that the amplitude of the signal of the frequency component of 1f4-fll output from the balanced modulator 26 increases. As a result, the level of the tracking error signal output from the differential amplifier 31 decreases, and the piezoelectric element drive circuit 32 drives the head actuator 21 so that the head locus of the reproducing head HB1 moves to the right.

Similar processing is performed when the head scan T2 @T4 deviates to the left from the recording track 1A, and the head actuator 22 is driven so that the head locus of the reproducing head HB2 moves to the right.

In this way, in head scanning T1 to T4, track 1A can be traced by shaking the head by the amount shown in Figure 4, and the output of the playback head HB1 is a video signal whose level does not decrease due to azimuth. Obtainable. At this time, after passing the reproduced signal of track 1A obtained by head scanning T1 through the bypass filter 33 shown in FIG.
The signal converted into a digital value by the A/D converter 34 is written into the storage means 36. The memory control device 38 outputs a switching signal for the switch 35 and a mode signal and address signal for the storage means 36.

Next, for head scans T5 to T8, trunk 1B can be traced by shaking the head by the amount shown in Figure 4, and a video signal without level drop due to azimuth can be obtained at the output of playback head HB2. . Therefore, the reproduction signal of track 1B obtained by head scanning T6 is A/
The data is converted into D and written to a specified address in the storage means 36.

Next, for head scanning T9 to T12, track 1C can be traced by shaking the head by the amount shown in FIG. It is possible to obtain a video signal with no level drop due to Therefore, the reproduced signal of track 1C obtained by head scanning T9 is A
/D conversion and written to a designated address in the storage means 36.

Finally, for head scanning T1s to T16, by shaking the head by the amount shown in Figure 4, it is possible to trace track 1D, and it is possible to obtain a video signal with no level drop due to azimuth at the output of playback head HB2. . Therefore, the reproduced signal of the track 1D obtained by the head scan T14 is A/D converted and written to the designated address of the storage means 36. In this way, the video signal of the first field is written into the storage means 36. Here, the screen of the first field is temporally divided into four parts from the top, and the part A in FIG. 6 is recorded on track 1A in FIG. This part is recorded on track 1D. Further, image data is written into the storage means 36 in the order of A, B, C, and D starting from the smallest address.

Next, when the head starts scanning the second field, the field switching detection signal changes from High to Low, so the system microcomputer switches the switch 35. Therefore, the output of the A/D converter 34 is input to the storage means 37 via the switch 35.

Further, the video data of the first field written in the storage means 36 passes through the switch 36 and is converted into an analog signal by the D/A converter 39 to be output as a video signal. This operation will be explained using FIGS. 3 and 4.

Regarding head scanning T1' to T4', Fig. 4 b1' to 4'
Track 2A can be traced by shaking the head by the amount shown in FIG. 2, and a video signal with no level drop due to azimuth can be obtained at the output of playback head HB1. Therefore, the reproduction signal of the track 2A obtained by the head scan T1' is A/D converted and written to the designated address of the storage means 37. Also, during this time, the storage means 36 is in the read mode, and the image data of the first field is read out and the image is output. Since the storage means 36 is read out in order from the smallest address, the video output is shown in the order of A, B, C, and D as shown in FIG.

Regarding head scanning Ts' to Ta', Fig. 4 bs' to 8'
Track 2B can be traced by shaking the head by the amount shown in , and a video signal with no level drop due to azimuth can be obtained at the output of playback head HB2. Therefore, the reproduced signal of the track 2B obtained by the head scanning Te' is A/D converted and written to the designated address of the storage means 37. Also, during this time, the storage means 36 is in the read mode, and the image data of the first field is read out and the image is output.

Regarding head scanning T9' to T12', Fig. 4b 9' to
Track 2C can be traced by shaking the head by the amount indicated by 12', and a video signal without a level drop due to azimuth can be obtained at the output of playback head HB1. Therefore, track 2 obtained by head scanning T9'
The reproduced signal of C is A/D converted and written to a designated address of the storage means 37. Also during this time, storage means 3
6 enters the read mode, and the image data of the first field is read out and the image is output.

Finally, regarding head scanning T13' to T16', Fig. 4b
Track 2C can be traced by shaking the head by the amounts shown in 13' to 16', and a video signal without a level drop due to azimuth can be obtained at the output of playback head HB2. Therefore, the reproduction signal of track 2D obtained by head scanning T14' is A/D converted and stored in the storage means 3.
7 is written to the specified address. Also during this time,
The storage means 36 is in a read mode, and the image data of the first field is read out and becomes a video output.

Next, when the head scans the third field, the switch 36 is changed again, the storage means 36 is in the write mode, the storage means 37 is in the read mode, and the reproduced image data of the third field is stored in the storage means 36. The image data of the second field written into the storage means 37 becomes the video output.

As described above, according to this embodiment, a clear field slow playback image without noise can be obtained.

Further, the maximum value of the head deflection width is 1.25 track pitch, and the amount of deflection of the head actuator can be extremely reduced.

As a second embodiment of the present invention, as shown in FIG.
A2 and playback head HB1 are the same head actuator 2
1, the same operation can be performed using the slow playback device shown in FIG.

As a third embodiment of the invention, as shown in FIG. 8, a recording/reproducing head HA1 is mounted on a head actuator 2, and a recording/reproducing head HA2 is mounted on the head actuator 1, as shown in FIG. A similar operation can be performed with the recording/reproducing heads HA1 and HA2 during slow reproduction using a slow reproduction apparatus. In this case, playback head HB1
Slow playback can be achieved without using ΦHB2, which has the advantage of reducing parts.

A fourth embodiment of the present invention will be described using FIGS. 9, 10, and 11.

The circuit blocks are the same as in the first embodiment. FIG. 9 shows the configuration of the magnetic head. 18o of rotating head drum 31
A pair of recording and reproducing heads HC1 and HO2 are installed at opposite positions at different azimuth angles, and
A reproducing head HCs having the same azimuth as HCl is mounted on a head actuator 30 and attached to a rotating head drum.

During recording, the recording and reproducing heads HC1 and HO2 record the -field video signal divided into at-tracks as shown in FIG. 1o, and each track receives a pilot signal f1. f2. f,
, f4 are recorded superimposed on the video signal. If the tape speed is set to - of normal playback and slow playback is performed at i times the normal playback speed, the scanning locus of the playback head HC3 will be T1 to T12 in FIG. 10 if the head actuator is not driven.
If the head output obtained at this time is directly used as a video output, a proper image cannot be obtained.

The operation of the slow playback circuit will be explained using FIG.

Each track 1A to 4C shown in FIG. 10 is provided with pilot signals f1 to f4 for tracking error detection.
They are recorded in the order of f2-f3-f4.

During playback, the track number corresponding to each track is output from the system microcomputer 40 in FIG. 1, the reference pilot selection circuit 26 is controlled, and the memory control device 28 is restricted. The operation will be explained below. First of all
The frame consists of recording tracks 1A to 2C, and the second frame consists of recording tracks 38 to 4C. Recording tracks 1A, 1C, 2B and 3A, 3C, and 4B are recorded by a recording/reproducing head HC1, and the azimuth angle is in the R direction. Since the azimuth angle of the playback head HCs is in the R direction, recording tracks 1A, 1C, 2B, 3A, 3C,
When the head actuator 3o is driven so that the playback head HC3 traces 4B, the direction and amount of deflection will be the first.
The result is as shown in Figure 1C. At this time, it is possible to obtain a video output from the playback head HC3 without a level drop due to azimuth. Therefore, the first frame is transferred to the playback head HCs.
While scanning, the storage means 36 is in the write mode and the storage means 37 is in the read mode. The video data obtained by scanning the track 1A with the playback head HCa is written to the address of the storage means 36 designated by the output of the memory control device 38. Similarly, the video data obtained by scanning the track 1C by the playback head HCs is stored in the storage means 3 designated by the output of the memory control device 38.
It is written to address 6. Further, the video data obtained by scanning the track 2B with the playback head HC3 is written to the address of the storage means 36 specified by the memory control device 38. In this way, the video signal of the first frame is written into the storage means 36. Here, the video signal of the first frame is temporally divided into six (AhB-C in Fig. 12a).
-A'-B'-C/) The part in Figure 12 a is recorded in trunk 1A in Figure 10, and hereafter B is 1B and C is 10
, A' is recorded at 2A, B' at 2B, and C' at 20. Image data is written into the recording means 36 in the order of A, B'@C from the smallest address.

Next, when the reproducing head HC3 scans the second frame, the storage means 36 is in the read mode) and the storage means 37 is in the write mode. Playhead HCs is on track 3
The video data obtained by scanning A is stored in the memory control device 38.
The data is written to the address of storage means 3 designated by the output. Similarly, the video data obtained by scanning the trunk 3C with the playback head HCa is written to the address of the storage means 37 designated by the output of the memory control device 38.

Further, the video data obtained by scanning the track 4B with the playback head HC3 is written to the address of the storage means 37 specified by the memory control device 38.

During this time, the storage means 36 is in the read mode υ,
After the video data is read out and converted into an analog signal by the D/A converter 39, it becomes a video output.

Since the storage means 36 is read out in order from the smallest address, the video output is A 8 B as shown in FIG.
'・C are displayed in this order. As described above, according to this embodiment, a clear slow-motion playback image without noise can be obtained. Furthermore, the number of heald actuators can be reduced to one, which has a great economical effect.

As a fifth embodiment of the present invention, a recording/reproducing head HA1 is mounted on a head actuator 30 as shown in FIG. 13, and the slow playback device shown in FIG. 1 is used, and the operation is similar to that of the fourth embodiment. can be done. In this case, slow playback can be performed without using the playback head HC1, which has the advantage of reducing parts.

As described in detail, the present invention is extremely useful since it is possible to obtain a clear reproduced video without image disturbance even during normal playback and special playback.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of a slow playback device according to a first embodiment of the present invention, FIG. 2 is a configuration diagram of a rotary head drum according to a second embodiment of the present invention, and FIG. 3 is a pattern diagram of recording tracks. , FIG. 4 is an auxiliary diagram for explaining the operation of the first embodiment of the present invention, FIG. 6 is a recording track pattern diagram, FIG. 6 is a screen configuration diagram of one field, and FIG. 7 is a diagram of the present invention. FIG. 8 is a block diagram of a rotary head drum according to a third embodiment of the present invention, and FIG. 9 is a diagram showing a rotary head drum according to a fourth embodiment of the present invention. Configuration diagram, 1st
Fig. 0 is a turn diagram of a recording track, Fig. 11 is an auxiliary drawing for explaining the fourth embodiment of the present invention, Fig. 12 is a screen configuration diagram of the first frame, and Fig. 13 is a diagram of the screen configuration of the first frame. FIG. 14 is a configuration diagram of a rotary head drum of a conventional example; FIG. 16 is a recording track pattern diagram; FIG. 1e is a circuit block diagram of a tracking error detection circuit; FIG. 17 is an auxiliary diagram for explaining the conventional example, FIG. 18 is a recording track pattern diagram, and FIG. 19 is an auxiliary diagram for explaining the conventional example. 1.2...Head actuator, 8...
...Balanced modulator, 9...Reference pilot signal,
10.11... Tuned amplifier, 12.13...
...Detector, 14...Differential amplifier, 21.22...
... Head actuator, 25 ... Balance modulator, 26 ... Reference pilot selection circuit, 27
．． 28... Tuned amplifier, 29°3o...
・Detector, 31...Differential amplifier, 34...
... A/D converter, 36.37... Storage means,
38...Memory control device, 39...D
/A converter. Name of agent: Patent attorney Toshio Nakao and 1 other person J:
'3 Fig. 2 HAI (Scale HA2 (L) Fig. 3 Fig. 5 ◆ -- Tape running direction gradient 4W (dl'F2j'45g 81234 trac/V. Fig. 10 Fig. 11 Fig. 12 Figure 13 Figure 14 Figure 15 ■ Figure 16 Figure 17

Claims (1)

[Claims] (1) First and second magnetic heads having different azimuth angles are mounted on a rotating drum at 180° opposing positions,
Track patterns formed by the first and second magnetic heads are alternately formed diagonally in the longitudinal direction of the tape on a running tape, and one field of video signal is divided into M tracks (M is an integer of 2 or more). A magnetic recording/reproducing device for recording data using a magnetic head, the A/D converter converting a reproduced video signal from the first or second magnetic head into a digital value, and storing the reproduced video signal converted into a digital value. a first storage means and a second storage means, a storage means control device that controls reading/writing of the first storage means and the second storage means and specifies an address; It has a D/A converter that converts the video data read from the second storage means into an analog signal,
When reproducing the Kth field, the reproduced video signal of the Kth field is converted into a digital value by the A/D converter, and is stored in the first storage means set to write mode by the storage means control device. Write, (K+1)
When reproducing the (K+1)th field, the reproduced video signal of the (K+1)th field is converted into a digital value by the A/D converter, and is stored in the second storage means set to write mode by the storage means control device. A magnetic recording/reproducing apparatus characterized in that the video data read from the first storage means set in a write/read mode is converted into an analog signal by the D/A converter and output as a video output.