JP2839793B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VHS type VTR.
The present invention relates to a magnetic recording / reproducing apparatus such as a (video tape recorder), and more particularly to a configuration of a rotary head thereof.

[0002]

2. Description of the Related Art In a VHS type VTR, an EP mode in which a track pitch is 58 μm (standard mode) and an EP in which the recording time is tripled by reducing the running speed of a video tape to 1/3 of that in the SP mode. Mode (3x mode)
In order to cope with the above, two video heads for the SP mode and two video heads for the EP mode are provided on the rotating drum.

[0003] These video heads are configured as so-called double azimuth type video heads in which head cores having different azimuths are attached to the same head base. The head width of the video head for the EP mode is set wider than the track pitch (19 μm) in the EP mode so that special reproduction such as slow reproduction and fast forward reproduction can be performed together with normal reproduction.
It is set to 30 μm. However, as a result, in the EP mode, crosstalk from an adjacent track increases, so that the image quality during normal reproduction deteriorates.

[0004] Therefore, in the recent of the rotary drum 15 0, as shown in FIG.
As shown in 1 8, the video head 15 for SP mode is 180 ° disposed 1L · 15 1R, video head 15 4L · 15 4R for special reproduction, the audio head 15 5L · 15 5R for Hi-Fi sound not only are provided, the video head 15 2L · 15 2R having exactly equal head width to the track pitch of the EP mode is newly added. As a result, the image quality in the EP mode is improved.

[0005]

However, in the above-mentioned conventional configuration, even if a video tape for long-time recording (T-180 of the VHS standard) is used in the EP mode, recording for 9 hours or more cannot be performed. Has problems.

In addition, VHS standard video tapes
Although it has about five times the volume of a video tape used in a mm-type VTR, the recording time is only 2.25 times. For this reason, there is also a problem that as the number of video tapes held increases, a large space is required in a storage place.

[0007]

According to a first aspect of the present invention, there is provided a magnetic recording / reproducing apparatus including a rotating head having at least one pair of video heads on a rotating drum, and a video tape. In the magnetic recording / reproducing apparatus for recording / reproducing a video, the head width of the video head is set to be wider than 1/6 of the track pitch in the standard mode and narrower than 1/3. The head is arranged at (180 + α) degrees on the rotating drum, and α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period. It is characterized in that video recording and reproduction are performed at 1/6 of the feed speed.

According to a second aspect of the present invention, there is provided a magnetic recording / reproducing apparatus including a rotary head having at least one pair of video heads on a rotary drum, in order to solve the above-mentioned problems.
In a magnetic recording / reproducing apparatus for recording / reproducing a video on a video tape, the head width of the video head is set to be wider than 1/6 of the track pitch in the standard mode and narrower than 1/3. Is arranged at (180 + α) degrees on the rotating drum, α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period, and the recording signal and the reproduction signal are shifted by one horizontal scanning period. A delay means for delaying by a half integral multiple of the scanning period, and a switching means for switching and outputting a signal delayed by the delay means and a signal not delayed for each frame are provided. When recording and reproducing video at a speed 1/6 of the feed rate in the standard mode, the video is recorded by switching between the delayed recording signal and the non-delayed recording signal for each frame. Then, the playback signal corresponding to the undelayed recording signal is delayed, and the playback signal delayed and the playback signal that is not delayed are frame-by-frame so that the playback signal corresponding to the delayed recording signal is not delayed. It is characterized in that video is reproduced by switching.

According to a third aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to the second aspect, wherein:
The switching means switches the signal delayed by the delay means and the undelayed signal for each frame during recording, and divides the frequency of a switching pulse for switching the video head alternately for each field by two. And a control means for generating a control pulse for switching the switch means.

According to a fourth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to the second aspect, wherein
The switching means includes a switching means for switching, on a frame-by-frame basis, between a signal delayed by the delay means and an undelayed signal during reproduction, a synchronization separation circuit for separating a vertical synchronization signal from a reproduction signal, It is characterized by comprising control means for generating a control pulse for switching the switch means so that the time interval is 1/60 second.

According to a fifth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus comprising: a rotary head having at least one pair of video heads and one pair of audio heads on a rotary drum; In a magnetic recording and reproducing apparatus for recording and reproducing video and audio, the head width of the video head and the audio head is wider than one sixth of the track pitch in the standard mode and one third.
The pair of video heads is arranged at (180 + α) degrees on the rotating drum, and α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period. The pair of audio heads are arranged at 180 degrees on a rotating drum, and perform recording and reproduction of video and audio at a video tape feed speed of 1/6 of the feed speed in the standard mode. It is characterized by.

According to a sixth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus for solving the above-mentioned problems.
The azimuth angle of the pair of audio heads is about 40 ° left and right
It is characterized by being set to.

According to a seventh aspect of the present invention, there is provided a magnetic recording / reproducing apparatus comprising: a left azimuth first video head and a right azimuth first video head having a head width equal to a track pitch on a rotating drum; 18 video heads
A left azimuth third video head and a right azimuth fourth video head having a head width equal to one third of the track pitch are arranged at 180 degrees, and are arranged at 180 degrees. A left azimuth first audio head and a right azimuth second audio head having a head width wider than one-half and narrower than the track pitch are provided with a rotary head arranged at 180 degrees. In a magnetic recording / reproducing apparatus for recording video on a video tape with first and second video heads and recording video on a video tape with third and fourth video heads in triple mode,
A fifth azimuth video head and a right azimuth sixth video head having a head width wider than one sixth of the track pitch and smaller than one third of the track pitch are arranged at 180 degrees, A left azimuth third audio head and a right azimuth fourth audio head having a head width larger than one sixth of the track pitch and smaller than one third of the track pitch are arranged at 180 degrees; and Each pair of the third video head and the sixth video head, the fourth video head and the fifth video head, the first audio head and the fourth audio head, and the second audio head and the third audio head. It is characterized by being configured as a double azimuth type.

[0014]

According to the first aspect of the present invention, a video can be recorded on a video tape for six times as long as the standard mode. Moreover, compatibility at the time of reproduction can be easily maintained between the magnetic recording / reproducing devices.

According to the structure of claim 2, the above-mentioned claim 1 is provided.
In addition to the operation described above, the positions of the horizontal synchronization signals are arranged on the video tape, so-called H arrangement, so that correlation can be made between adjacent tracks. This makes it difficult for beat-like interference on the screen to occur.

According to the configuration of claim 3, the above-mentioned claim 2 is provided.
In addition to the operation described above, a control pulse output for each frame during recording can be created with a simple configuration.

According to the configuration of claim 4, the above-mentioned claim 2 is provided.
In addition to the operation described above, a control pulse for obtaining a continuous reproduction signal of frames during reproduction can be created with a simple configuration.

According to the configuration of the fifth aspect, video and audio can be recorded on a video tape for six times the time in the standard mode. Moreover, compatibility at the time of reproduction can be easily maintained between the magnetic recording / reproducing devices.

According to the configuration of claim 6, according to claim 5 described above.
In addition to the effect of the above, since the crosstalk from the adjacent track on the video tape can be reduced, the sound quality is improved.

According to the configuration of claim 7, the fifth and sixth aspects are provided.
6 times longer than standard mode with video head
Can be recorded on videotape. In addition, the third and fourth audio heads are used to transmit the sound in the standard mode 6.
Double the time it can be recorded on videotape. In addition, special reproduction such as still and slow can be performed on the recorded video using the third, fifth, and sixth video heads or the fourth, fifth, and sixth video heads. it can. Further, compatibility at the time of reproduction can be easily maintained between the magnetic recording / reproducing devices.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the recording system of the S-VHS VTR of this embodiment is an AGC (automatic gain control circuit) for amplifying a composite video signal from a television tuner or a video camera to an appropriate amplitude. 1 and a Y / C separation circuit 2 for separating and extracting a Y signal (luminance signal) and a C signal (chroma signal) from the output signal of the AGC 1.

Further, the recording system of the VTR includes an LPF (low-pass filter) 3 for extracting a low-frequency component from the Y signal from the Y / C separation circuit 2, a non-linear emphasis circuit 4 for emphasizing the high frequency range of the signal from the LPF 3, A main emphasis circuit 5, a white / dark clip circuit 6 for performing white clipping and dark clipping of a signal from the main emphasis circuit 5, and an FM modulation circuit 7 for performing FM modulation (frequency modulation) on a signal from the white / dark clipping circuit 6 It has.

The VTR recording system extracts a signal component having a center frequency of 3.58 MHz from the C signal from the Y / C separation circuit 2 (BPF).
1, an ACC (automatic chroma level control circuit) 12 for making the amplitude of the burst signal constant, a low-frequency conversion circuit 13 for performing low-frequency conversion of the C signal, a burst emphasis circuit 14 for emphasizing the burst signal, and a C signal Is provided with a color killer circuit 15 for cutting off the output when is a monochrome signal, and an LPF 16 for extracting low frequency components.

The VTR recording system further includes a synthesizing circuit 8 for synthesizing the output signal from the FM modulation circuit 7 and the output signal from the LPF 16, and a recording amplifier 9 for amplifying the signal from the synthesizing circuit 8. And a rotary head 10 for magnetically recording a recording signal from a recording amplifier 9 on a video tape 17.

As shown in FIG. 3, the reproduction system of the VTR according to the present embodiment has a reproduction amplifier 21 for amplifying a reproduction signal obtained from the video tape 17 by the rotary head 10, and characteristics of a Y signal from the reproduction amplifier 21. And a demodulation circuit 23 for FM demodulating the Y signal
A main de-emphasis circuit 24 for suppressing the high frequency band of the Y signal as opposed to the main emphasis circuit 5 of the recording system;
The LPF 25 includes an LPF 25 for extracting a low-frequency component, a non-linear emphasis circuit 26 for suppressing the high band of the Y signal, and a luminance signal processing circuit 27 for cutting high band noise, contrary to the non-linear emphasis circuit 4 of the recording system.

The reproduction system of the VTR includes a reproduction amplifier 21.
An LPF 29 for extracting a low-frequency component from the C signal from
An ACC 30 for keeping the amplitude of the burst signal constant, a high-frequency conversion circuit 31 for returning the C signal to a high frequency, which is opposite to the low-frequency conversion circuit 13 for the recording system, a BPF 32 for extracting the C signal component, and a burst emphasis for the recording system A burst de-emphasis circuit 33 for suppressing a burst signal, which is opposite to the circuit 14,
A crosstalk removing comb filter 34 for removing crosstalk of the C signal, a color killer circuit 35 for cutting off the output when the C signal is a monochrome signal, and a CNR (color signal processing circuit) 36 for cutting high-frequency noise. Have.

The reproduction system of the VTR further comprises a synthesizing circuit 28 for synthesizing the Y signal from the luminance signal processing circuit 27 and the C signal from the CNR 36 and outputting it as a composite video signal to a monitor or the like. .

As shown in FIG. 1, the rotary head 10 includes a rotary drum 50 and an SP mode (standard mode) video head 5 arranged on the rotary drum 50 at 180 °.
1L / 51R (first and second video heads), video heads 52L / 52R for EP mode (triple mode)
(Third and fourth video heads), video heads 53L and 53R for AP mode (6x mode) (fifth and sixth video heads), and video heads 54L and 54R for special playback in SP mode and EP mode. , SP-mode and EP-mode audio heads 55L and 55R (first and second audio heads), and AP-mode Hi-Fi audio heads 56L and 56R (third and fourth audio heads) Audio head).

The azimuth angles of the video heads 51L to 54L are +6 degrees, the azimuth angles of the video heads 51R to 54R are -6 degrees, the azimuth angles of the audio heads 55L and 56L are +30 degrees, and the azimuth angles of the audio heads 55R and 56R are-. It is set to 30 degrees.

Video heads 51L and 51 for SP mode
The head width of R is set so as to substantially coincide with the width (58 μm) of the recording track in the SP mode.
The head width of the video heads 52L and 52R for the P mode is the width of the recording track in the EP mode (19.3 μm).
m).

On the other hand, a video head 53L for the AP mode
The head width of the 53R is wider than the recording track width (9.6 μm) in the AP mode, and is twice as large as the recording track (19.3 μm) in order to avoid crosstalk from adjacent recording tracks. ) Is set to be smaller, and in this embodiment, it is set to 15 μm.

The head width of the video heads 54L and 54R for special reproduction in the SP mode and the EP mode is as follows.
Recording track width in EP mode (19.3 μm)
In order to avoid the crosstalk from the recording tracks that are wider and adjacent to each other, the width of the recording tracks is twice (38.
6 μm), and is set to 26 to 30 μm in the present embodiment.

Further, the head width of the audio heads 55L and 55R for Hi-Fi audio in the SP mode and the EP mode is equal to the recording track width (1 in the EP mode).
9.3 μm), and is set to be narrower than twice the width (38.6 μm) of the recording track in order to avoid crosstalk from adjacent recording tracks. , 28 μm.

On the other hand, the head width of the audio heads 56L and 56R for the Hi-Fi audio in the AP mode is wider than the width of the recording track (9.6 μm) in the AP mode, and the head width from the adjacent recording track is large. Double the width of the recording track (19.3 μm) to avoid crosstalk.
m), and is set to 18 μm in the present embodiment.

The pair of video heads 51L and 54R has a double azimuth type configuration in which each head core is attached in the same head base shape. Video head 51R / 54L, video head 52L / 53R, video head 52R / 53L, audio head 55L /
Similarly, each pair of the audio heads 56R and the audio heads 55R and 56L has a double azimuth type configuration.

In order to ensure compatibility between different VTRs in the AP mode, the head widths of the video heads 53L and 53R are determined in consideration of the linearity of the recording track.
It is preferably 15 μm or more. This will be described below with reference to FIG.

According to the target standard of S-VHS, the linearity of a recording track is determined to be within 7 μm. Therefore, for example, as shown in FIG. 4, when the reproduction-side VTR has a linearity characteristic as shown by a curve 40 and the recording-side VTR has a linearity characteristic as shown by a curve 41, Both VTRs meet the standard.

Here, the vertical axis indicates linearity, and the horizontal axis indicates a position along a recording track. The positions A to D are respectively the video heads 53L and 5L.
The figure shows a 3R switching point, a recording position of a vertical synchronization signal, a recording start position of a video signal, and a recording position near the middle of a video signal.

V having a linearity characteristic of curve 41
When the video tape 17 on which the video is recorded by the TR is reproduced by the VTR having the linearity characteristic of the curve 40, the on-track amount at the position B where the vertical synchronization signal is recorded is the track pitch in the AP mode (9.6 μm). 50% of
If the on-track amount after the position C where the video signal is recorded is 70% or more, the compatibility between these VTRs can be maintained. In other words, if the on-track amount at the position B is 5 μm or more and the on-track amount after the position C is 7 μm or more, compatibility between VTRs can be maintained.

The reason why the on-track amount at the position B may be small is that the vertical synchronizing signal portion is advantageous in terms of S / N since the carrier frequency is low.

In order to secure an on-track amount of 5 μm or more at the position B, the off-track amount at the position B is 8.5 μm.
Since the tracking shift amount is 1 μm at the maximum, a head width of 8.5 μm + 5 μm + 1 μm = 14.5 μm is required at least. On the other hand, after position C, 7
In order to secure the on-track amount of μm or more, the position C
Is 3.5 μm, so if the maximum tracking shift amount is 1 μm, 3.5 μm + 7 μm.
At least a head width of m + 1 μm = 12.5 μm is required. Therefore, the head width of the video heads 53L and 53R is preferably 15 μm or more.

Similarly, in the case of a Hi-Fi audio signal in the AP mode, if the on-track amount is 7 μm or more as in the case of the video signal, compatibility between VTRs can be maintained. However, Hi
Since the Fi audio signal is continuous without a vertical blanking period, the audio head 56L for Hi-Fi audio
After the 56R switching point, it is necessary to always secure an on-track amount of 7 μm or more.

Therefore, the off-track amount at the position A is 9.5 μm.
The required head width is 17.5 μm obtained by adding μm and further adding 1 μm of the tracking shift amount at point D. Therefore, the head width of the audio heads 56L and 56R is preferably 18 μm or more. It should be noted that the linearity characteristic is desirably within 5 μm in order to provide a margin for compatibility.

Next, separation of a video signal and an audio signal will be described with reference to FIGS.

In the AP mode, similarly to the SP mode and the EP mode, the Hi-Fi sound is transmitted to the dedicated audio head 5.
A so-called deep recording method in which recording is performed prior to a video using 6L / 56R is adopted. Therefore, as shown in FIG. 5, the recording track 42 of the Hi-Fi audio signal and the recording track 43 of the video signal overlap on the video tape 17. Note that the oblique lines in the figure indicate the azimuth direction.

The video signal and the audio signal are separated by using the azimuth loss.
As the width W where the recording track 43 of the plus azimuth overlaps (or the width W where the recording track 42 of the minus azimuth overlaps with the recording track 43 of the minus azimuth) is larger, as shown in FIG. The degree of separation of audio signals is improved. The degree of separation was measured at 1.3 MHz.

For this reason, it is best if the recording tracks 42 and 43 are completely overlapped. However, considering the efficiency at the time of adjusting the step (height) between the audio heads 56L and 56R and the video heads 53L and 53R, The overlapping width W may be 8 μm or more.

By the way, as described above, the video head 5
Since the head width of 3L / 53R is set to 15 μm or more, the video heads 53L / 53R also detect the Hi-Fi audio signal of the adjacent recording track 42.
In this case, the degree of separation between the video signal and the audio signal becomes maximum when the amount of overlap between the video heads 53L and 53R and the adjacent recording tracks 42 is about 6 μm, as shown in FIG.

As described above, the video heads 53L and 53
If the head width of R is set to 15 μm, the recording track 4
When 2 and 43 are completely overlapped, the above-mentioned overlapping amount is about 5.5 μm (≒ 15-9.6), so that a large degree of separation is obtained, which is advantageous.

In the AP mode, the running speed of the video tape 17 is half that in the EP mode.
The adjacent recording tracks 43 are not arranged in the H arrangement. Moreover, since the video heads 53L and 53R extend to the adjacent recording tracks 43, crosstalk occurs in the horizontal synchronizing signal portion and the color burst portion having a low carrier frequency, and beat-like interference occurs near the center of the screen.

In order to make this visually inconspicuous,
At the time of recording, as in the EP mode, it is necessary to shift the carrier frequency in the FM modulation circuit 7 by １ ／ horizontal scanning frequency (f _H / 2) for each recording track 43.

Further, in the SP mode or the EP mode, the color burst is doubled at the time of recording and is reduced to 1/2 at the time of reproduction, thereby increasing the S / N of the color burst and the burst emphasis circuit 14 and the burst. It is necessary to disable the de-emphasis circuit 33 in the AP mode.

The (f _H / 2) carrier shift in the FM modulation circuit 7 and the burst-up by the burst emphasis circuit 14 and the burst de-emphasis circuit 33 are controlled by control means (not shown) according to each mode. It is performed based on the signal.

Table 1 shows the operating states of (f _H / 2) carrier shift and burst-up in each mode.

[0056]

[Table 1]

As described above, in the AP mode of the present embodiment, the interleaving relationship is created for each recording track 43 by performing the (f _H / 2) carrier shift, thereby suppressing the deterioration of the image quality. By not performing burst-up, crosstalk between bursts on a screen with low color saturation is made inconspicuous.

The special reproduction such as still and slow in the AP mode is performed by the video heads 52R, 53L and 53R. That is, the still is the video head 52R.
The search (fast forward playback) is performed by the video heads 53L and 53R, and the slow search is performed by the video head 52R.
This is performed by 53L and 53R.

Table 2 shows the video heads 52R, 53L, and 53R selected for each special reproduction in the AP mode.
During special playback, the video heads 52R, 53L, 53
Instead of R, video heads 52L, 53L, 53R may be used.

[0060]

[Table 2]

In the above embodiment, a rotary erasing head may be added on the rotary drum 50 in order to facilitate editing. In the above embodiment, S-VH
Although the S type VTR has been described, the present invention can be applied to a normal VHS type VTR.

The second embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 8, the rotary head 10 'of the present embodiment has a video head 53L'
The above embodiment is different in that R ′ is disposed at (180 + α) ° on the rotating drum 50 and that the rotation erasing head 57a and the dummy head 57b for balance are disposed at 180 ° on the rotating drum 50. Is different from here,
α is an angle at which the rotary head 10 ′ rotates at a time equal to 0.25H, and H is one horizontal scanning period.

When an image is recorded in the AP mode (six times mode) using the rotary head 10 ′, on the video tape 17, as shown in FIG. The position and the position of the horizontal synchronization signal in the even field are aligned. On the other hand, between frames, the position of the horizontal synchronization signal in the odd field and the position of the horizontal synchronization signal in the even field are separated by a distance corresponding to 0.5H. By the way, when the video is recorded in the AP mode using the rotary head 10 of the embodiment, on the video tape 17, the position of the horizontal synchronization signal corresponds to 0.25H between adjacent tracks as shown in FIG. Separated by a certain distance.

As described above, the rotary head 10 'of this embodiment is
According to the embodiment, since the positions of the horizontal synchronization signals are arranged in the same frame, beat-like interference on the screen is less likely to occur as compared with the rotary head 10 of the embodiment.

Further, in the VTR using the rotary head 10 'of this embodiment, at the time of recording, the recording signal is delayed by n * 0.5H (n is a positive odd number) every other frame. For example, on the video tape 17, the positions of all the horizontal synchronizing signals are arranged in a straight line. That is, H arrangement can be realized. On the other hand, at the time of reproduction, if a frame not delayed at the time of recording is delayed by a period of n × 0.5H, the time axis of all frames becomes continuous.

By configuring the VTR as described above, beat-like interference on the screen hardly occurs in the AP mode. Note that n is desirably 1 or 3 in order to have a correlation between adjacent tracks.

FIG. 9 shows an example of this VTR. It should be noted that the processing block 70 in the figure is the main part of this embodiment, and VH
The luminance signal processing circuit and the chroma signal processing circuit of the S system are not shown because they are almost the same as those of the above embodiment.

The recording system includes an AGC 71 for amplifying the composite video signal to an appropriate amplitude, a Y / C separation circuit 72 for separating and extracting a Y signal and a C signal from an output signal of the AGC 71,
The BPF includes a BPF 74 for extracting a signal component having a center frequency of 3.58 MHz from the C signal, a main converter 75 for converting the C signal to a low frequency band of 629 kHz, and an LPF 76 for extracting a low frequency component.

The reproduction system includes an FM demodulation circuit 77 for demodulating an FM signal reproduced by the rotary head 10 'and extracting a Y signal, and an LPF 78 for extracting a low-frequency component from a C signal extracted from the FM signal. . Switching between recording (Rec) and reproduction (PB) is performed by switches 73a and 73b.

The processing block 70 comprises a Y signal system, a C signal system, and a control system. Y signal system is LPF8
1. A 0.5H delay circuit 82 and a switch 83a (switch means) for switching between a delay signal and a through signal are provided. The C signal system is an AGC85, 0.5H delay circuit 8
6. A switch 83b (switch means) for switching between the delay signal and the through signal is provided. The control system (switching means) includes a control microcomputer 88 (control means) and a synchronization separation circuit 87. Switch 84 for switching between SP mode & EP mode and AP mode
a to 84c.

In the above configuration, the switches 84a to 84a
When SP mode & EP mode is selected by 4c,
The Y and C signals simply pass through processing block 70. That is, at the time of recording, the Y signal from the Y / C separation circuit 72 is sent to the luminance signal processing circuit at the subsequent stage, where the LPF 76
Is sent to the recording amplifier via the (Y / C) MIX circuit. On the other hand, during reproduction, the Y signal from the FM demodulation circuit 77 is sent to the luminance signal processing circuit, and the C signal from the LPF 78 is sent to the chroma signal processing circuit via the ACC 89.

When the AP mode is selected by the switches 84a to 84c, a delay processing is performed in a processing block 70.

First, recording in the AP mode will be described. The Y signal from the Y / C separation circuit 72 is separated into a delay signal passing through the delay circuit 82 and a through signal not passing through the delay circuit 82 after unnecessary high frequency components are removed by the LPF 81. The delay signal and the through signal are alternately selected for each frame by the switch 83a, and the selected signal is sent to the luminance signal processing circuit. Main converter 75
After the unnecessary high-frequency component is removed by the LPF 76 from the C signal from the
6 through signals that do not pass through. The delay signal and the through signal are alternately selected for each frame by the switch 83b, and the selected signal is sent to the recording amplifier via the (Y / C) MIX circuit.

The switches 83a and 83b are controlled by the microcomputer 88. That is, as shown in FIG. 11, when the microcomputer 88 receives the recording start signal (FIG. 11B), the microcomputer 88 switches the video heads 53L ′ and 53R ′ alternately (FIG. 11A). ) By dividing by 2
A control pulse (FIG. 9C) which becomes high level every frame is generated, whereby the switches 83a and 83
3b is switched. In the figure, when the control pulse is low level, the through signal is selected, and when the control pulse is high level,
It is shown that the delay signal is selected.

The delay circuit 82 may be an analog circuit using a CCD (charge coupled device) or a digital circuit using a line memory. When configured with an analog circuit, a bandwidth of 4 f _SC (f _SC is a color subcarrier frequency) or more is required to cover a wide band of S-VHS. Therefore, the input band is limited by the LPF 81 in order to prevent aliasing noise. However, due to the band limitation, a level difference and a frequency characteristic difference tend to occur between the delay signal and the through signal. Therefore, as shown in FIG. 10, the IC (integrated circuit) for the delay circuit 82 is provided with not only the clamp circuit 91 and the CCD 92 but also a switch 83a so that the delay signal and the through signal are switched inside the IC. It has become. In the case of the chroma signal delay circuit 86, the clamp circuit 91 is unnecessary.

When the delay circuits 82 and 86 are constituted by digital circuits, both the through signal and the delay signal are subjected to A / D conversion (analog-digital conversion), so that no level difference or frequency characteristic difference occurs.

Next, reproduction in the AP mode will be described. The Y signal from the FM demodulation circuit 77 is divided into a delay signal passing through the delay circuit 82 and a through signal not passing through the delay circuit 82 after unnecessary high frequency components are removed by the LPF 81. The delay signal and the through signal are alternately selected for each frame by the switch 83a, and the selected signal is sent to the luminance signal processing circuit. The C signal from the LPF 78 passes through the AGC 85 and is divided into a delay signal passing through the delay circuit 86 and a through signal not passing through the delay circuit 86. The delay signal and the through signal are alternately selected for each frame by the switch 83b.
And then sent to the chroma signal processing circuit.

The switches 83a and 83b are controlled by the microcomputer 88. Sync separation circuit 87
The vertical synchronizing signal is taken out from the reproduced signal by the microcomputer, and the pulse interval of the vertical synchronizing signal is measured by the microcomputer 88.
The polarity of the control pulse is switched so that the pulse interval becomes 1/60 second. As another method, for example, there is a method of recording a pilot signal indicating a frame to be delayed together with a recording signal. In this case, a pilot signal of 100 kHz or less may be frequency-multiplexed with the recording signal, or the pilot signal may be inserted in a vertical blanking period of the recording signal.

As described above, according to the VTR of the present embodiment, even in the AP mode, since the positions of the horizontal synchronization signals of all the frames on the video tape 17 are arranged in a straight line, crosstalk from an adjacent track may occur. Even if there is, there is no beat disturbance on the screen. In addition, since the color burst in the AP mode can be burst-up in the same manner as in the SP / EP mode, the S / N of the C signal is improved.

Next, the audio heads 56L and 56R for Hi-Fi audio in the AP mode will be described.

The azimuth angles of the audio heads 56L and 56R are ± 30 °, and the head widths are 16 μm and 17 μm.
FIG. 14 shows the result of measuring the magnitude of the crosstalk from the adjacent track in the AP mode with respect to the frequency in the case of changing to m and 18 μm.

The azimuth angles of the audio heads 56L and 56R are set to ± 40 °, the head width is set to 17 μm,
FIG. 15 shows the result of measuring the magnitude of the crosstalk from the adjacent track in the AP mode with respect to the frequency by changing to 8 μm.

For comparison, audio heads 55L / 5 for Hi-Fi audio in SP mode and EP mode
5R azimuth angle ± 30 °, head width 25μ
FIG. 16 shows the results of measuring the magnitude of the crosstalk from the adjacent track in the EP mode with respect to the frequency in the case of changing to m, 26 μm, 27 μm, and 28 μm. Similarly,
FIG. 17 shows the measurement results when the head width was changed to 29 μm, 30 μm, and 31 μm.

In the EP mode, the azimuth angle is set to ± 30 °.
And curves 99a-9 corresponding to head widths of 25-31 [mu] m.
From 9g (FIGS. 16 and 17), the maximum value of the crosstalk is about −30 dB, and in the AP mode, curves 97a to 97c corresponding to an azimuth angle of ± 30 ° and a head width of 16 to 18 μm (FIG. 15). Therefore, the maximum value of the crosstalk is about -20 dB. Therefore, crosstalk occurs about 10 dB greater in the AP mode than in the EP mode.

When the azimuth angle is changed from ± 30 ° to ± 40 ° in the AP mode, the maximum value of the crosstalk becomes about −30 dB from the curves 98b and 98c (FIG. 16) corresponding to the head widths of 17 and 18 μm. . That is, it can be seen that there is almost no difference from the EP mode. As mentioned above,
Azimuth angle of audio head 56L / 56R is 30 °
By making it larger, preferably near 40 °, crosstalk in the AP mode can be reduced and good sound quality can be obtained.

The VTR according to the first aspect of the present invention has at least one pair of video heads 53L 'on the rotating drum 50.
In a VTR including a rotating head 10 'having 53R' and recording and reproducing video on the video tape 17, the head width of the video heads 53L 'and 53R' is wider than one sixth of the track pitch in the standard mode. The pair of video heads 53L 'is set to be narrower than one third.
53R 'is arranged at (180 + α) degrees on the rotating drum 50, and α is set to an angle at which the rotating drum 50 rotates during a quarter of one horizontal scanning period. Is 1/6 of the feed rate in standard mode
The video can be recorded and reproduced in this manner, so that the video can be recorded on the video tape 17 for six times the time in the standard mode. In addition, compatibility at the time of reproduction between VTRs can be easily maintained.

The VTR according to the second aspect of the present invention has at least one pair of video heads 53L 'on the rotating drum 50.
In a VTR including a rotating head 10 'having 53R' and recording and reproducing video on the video tape 17, the head width of the video heads 53L 'and 53R' is wider than one sixth of the track pitch in the standard mode. The pair of video heads 53L 'is set to be narrower than one third.
53R 'is arranged at (180 + α) degrees on the rotating drum, α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period, and the recording signal and the reproduction signal are set to 0. There are provided delay circuits 82 and 86 for delaying by 5H, and switching means for switching and outputting a signal delayed by the delay circuits 82 and 86 and a signal not delayed for each frame. When recording and reproducing video at 1/6 of the feed rate in the standard mode, the video is recorded by switching between the delayed recording signal and the non-delayed recording signal for each frame, and the video is not delayed. The playback signal corresponding to the recording signal is delayed, and the playback signal that is delayed and the playback signal that is not delayed are switched for each frame so that the playback signal corresponding to the delayed recording signal is not delayed. Since the video is played back, the video can be recorded on the video tape 17 for a time six times longer than the standard mode. In addition, compatibility at the time of reproduction between VTRs can be easily maintained.

Further, since the positions of the horizontal synchronizing signals are arranged on the video tape 17 in a so-called H arrangement, correlation can be made between adjacent tracks. This makes it difficult for beat-like interference on the screen to occur.

In the VTR according to the third aspect of the present invention, the switching means includes switches 83a and 83b and a microcomputer 88. At the time of recording, the microcomputer 88 controls the video heads 53L 'and 53R' for each field. Since the switches 83a and 83b are switched by the control pulse obtained by dividing the switching pulse for alternately switching by two, the video can be recorded on the video tape 17 for six times the time in the standard mode. In addition, compatibility at the time of reproduction between VTRs can be easily maintained. Further, since the positions of the horizontal synchronizing signals are arranged on the video tape 17 in a so-called H arrangement, correlation can be made between adjacent tracks. This makes it difficult for beat-like interference on the screen to occur. Furthermore, a control pulse output for each frame during recording can be created with a simple configuration.

A VTR according to a fourth aspect of the present invention is characterized in that the switching means comprises switches 83a and 83b, a synchronization separation circuit 87 for separating a vertical synchronization signal from a reproduction signal, and a microcomputer 88. The microcomputer 88 sets the time interval of the vertical synchronization signal to 60.
Since a control pulse for switching the switches 83a and 83b is generated so as to be a fraction of a second, an image can be recorded on the video tape 17 for six times as long as in the standard mode. In addition, compatibility at the time of reproduction between VTRs can be easily maintained. Further, since the positions of the horizontal synchronizing signals are arranged on the video tape 17 in a so-called H arrangement, correlation can be made between adjacent tracks. This makes it difficult for beat-like interference on the screen to occur. Furthermore, a control pulse for obtaining a continuous reproduction signal of frames during reproduction can be created with a simple configuration.

The VTR according to the fifth aspect of the present invention has at least one pair of video heads 53L 'on the rotating drum 50.
.53R 'and a pair of audio heads 56L.56
Video tape 17 with a rotating head 10 '
In a magnetic recording and reproducing apparatus for recording and reproducing video and audio, the head width of the video heads 53L 'and 53R' and the audio heads 56L and 56R is wider than one sixth of the standard mode track pitch. The pair of video heads 53L '.
53R 'is disposed at (180 + α) degrees on the rotating drum 50, and α is set to an angle at which the rotating drum 50 rotates during a quarter of one horizontal scanning period. 56L and 56R are arranged at 180 degrees on the rotating drum 50, and perform recording and reproduction of video and audio by setting the feed speed of the video tape 17 to 1/6 of the feed speed in the standard mode. Recording can be performed on the video tape 17 for six times the time in the standard mode. In addition, compatibility at the time of reproduction between VTRs can be easily maintained.

In the VTR according to the sixth aspect of the present invention, the azimuth angles of the pair of audio heads 56L and 56R are set to about 40 ° on the left and right, so that the video and audio can be recorded for six times the time in the standard mode. It can be recorded on the tape 17. In addition, compatibility at the time of reproduction between VTRs can be easily maintained. Further, since crosstalk from an adjacent track on the video tape 17 can be reduced, sound quality is improved.

In the VTR according to the seventh aspect of the present invention, a left azimuth first video head 51L and a right azimuth second video head 51R having a head width equal to the track pitch are arranged 180 degrees on the rotary drum 50. And
A left azimuth third video head 52L and a right azimuth fourth video head 52R having a head width equal to one-third of the track pitch are arranged at 180 degrees, and the third azimuth fourth video head 52R is larger than one-third of the track pitch. It has a rotary head in which a left azimuth first audio head 55L and a right azimuth second audio head 55R having a head width that is wider than the track pitch and 180 degrees are arranged. The video is recorded on the video tape 17 by the second video heads 51L and 51R, and the third and fourth video heads 52 are used in the triple mode.
VTR that records video on video tape 17 using L · 52R
, A left azimuth fifth video head 53L and a right azimuth sixth video head 53L having a head width wider than one sixth of the track pitch and narrower than one third of the track pitch are provided on the rotating drum 50. A third azimuth audio head 56L having a left azimuth and a right azimuth having a head width wider than one sixth of the track pitch and narrower than one third of the track pitch are provided with a video head 53R arranged 180 degrees. 4th audio head 56R
Are arranged 180 degrees, and the third video head 52L and the sixth video head 53R, the fourth video head 52R and the fifth video head 53L, the first audio head 55L and the fourth audio head 56R, and Since each pair of the second audio head 55R and the third audio head 56L is configured as a double azimuth type, the fifth and sixth video heads 53L and 53L
With R, a video can be recorded on the video tape 17 for six times the time in the standard mode. In addition, the third and fourth audio heads 56L and 56R can record sound on the video tape 17 for a time six times longer than in the standard mode. In addition, the third, fifth, and sixth video heads 52L, 53L, 53R
Or, the fourth, fifth, and sixth video heads 52
Using R, 53L, and 53R, special reproduction such as still and slow can be performed. Further, compatibility during reproduction between VTRs can be easily maintained.

[0095]

As described above, the magnetic recording / reproducing apparatus according to the first aspect of the present invention includes the rotary head having at least one pair of video heads on the rotary drum, and performs the recording and reproduction of video on a video tape. In the recording / reproducing apparatus, the head width of the video head is 6 times the track pitch in the standard mode.
It is set to be wider than one-third and narrower than one-third.
+ Α) degrees, and α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period, and the feed speed of the video tape is set to one sixth of the feed speed in the standard mode. Since the video is recorded and reproduced in this manner, the video can be recorded on the video tape for six times the time in the standard mode. In addition, there is an effect that the compatibility at the time of reproduction can be easily maintained between the magnetic recording and reproducing devices.

As described above, the magnetic recording and reproducing apparatus according to the second aspect of the present invention includes the rotating head having at least one pair of video heads on the rotating drum, and performs the recording and reproducing of video on a video tape. In the device, the head width of the video head is 6 times the track pitch of the standard mode.
It is set to be wider than one-third and narrower than one-third.
+ Α) degrees, and α is set to an angle at which the rotating drum rotates in a quarter of one horizontal scanning period, and the recording signal and the reproduction signal are converted into a half integral multiple of one horizontal scanning period. A delay means for delaying, and a switching means for switching and outputting a signal delayed by the delay means and a signal not delayed for each frame, and providing a video tape feed speed of the standard mode. When recording and reproducing a video at 1/6, a video signal is recorded by switching between a delayed recording signal and a non-delayed recording signal for each frame, and a reproduction signal corresponding to the non-delayed recording signal is recorded. The video is reproduced by switching between the delayed reproduction signal and the non-delayed reproduction signal for each frame so as not to delay the reproduction signal corresponding to the delayed recording signal. In addition to the effect of the first aspect, the positions of the horizontal synchronization signals are arranged on the video tape, so-called H arrangement, so that correlation can be made between adjacent tracks. This allows
An effect that beat-like interference on the screen is less likely to occur is exerted.

As described above, in the magnetic recording / reproducing apparatus according to the third aspect of the present invention, in the second aspect, the switching means converts the signal delayed by the delay means and the signal not delayed during recording. 3. The switching device according to claim 2, wherein the switching unit switches the switching unit for each frame and the control unit generates a control pulse for switching the switching unit by dividing the switching pulse for switching the video head for each field by two. In addition, a control pulse output for each frame during recording can be created with a simple configuration.

The magnetic recording / reproducing apparatus according to the fourth aspect of the present invention provides a magnetic recording / reproducing apparatus according to the second aspect,
The switching means includes a switching means for switching, on a frame-by-frame basis, between a signal delayed by the delay means and an undelayed signal during reproduction, a synchronization separation circuit for separating a vertical synchronization signal from a reproduction signal, The control means for generating a control pulse for switching the switch means so that the time interval is 1/60 second.
In addition to the effects described above, there is an effect that a control pulse for obtaining a reproduced signal of continuous frames during reproduction can be created with a simple configuration.

The magnetic recording / reproducing apparatus according to the fifth aspect of the present invention comprises a rotating head having at least one pair of video heads and one pair of audio heads on a rotating drum, and a video tape having video and audio signals. In the magnetic recording / reproducing apparatus for performing recording / reproducing, the head width of the video head and the audio head is set to be wider than 1/6 of the track pitch in the standard mode and narrower than 1/3. The video head is arranged at (180 + α) degrees on the rotating drum, and α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period. It is arranged at 180 degrees on the rotating drum, and the video and audio are recorded and reproduced at a video tape feed speed of 1/6 of the feed speed in the standard mode. Video and audio in standard mode 6
This has the effect of being able to record on a video tape twice as long. In addition, there is an effect that the compatibility at the time of reproduction can be easily maintained between the magnetic recording and reproducing devices.

As described above, in the magnetic recording / reproducing apparatus according to the sixth aspect of the present invention, the azimuth angle of the pair of audio heads is set to about 40 ° on the left and right in the fifth aspect. In addition to the effect of 5, the crosstalk from adjacent tracks on the video tape can be reduced,
This has the effect of improving sound quality.

In the magnetic recording / reproducing apparatus according to the seventh aspect of the present invention, as described above, the left azimuth first video head and the right azimuth second video head having a head width equal to the track pitch are provided on the rotating drum. A left azimuth third video head and a right azimuth fourth video head having a head width equal to one-third of the track pitch are arranged at 180 degrees and are arranged at 180 degrees. A left azimuth first audio head and a right azimuth second audio head having a head width wider than one-half and smaller than the track pitch are equal to one.
It has a rotating head arranged at an angle of 80 degrees, in a standard mode, video is recorded on a video tape by a first and a second video head, and in a triple mode, a video is recorded by a third and a fourth video head. In the magnetic recording / reproducing apparatus for recording on a tape, a left azimuth fifth video head having a head width larger than one sixth of the track pitch and smaller than one third of the track pitch is provided on the rotating drum. A left azimuth third audio head having a head width wider than 1/6 of the track pitch and narrower than 1/3 of the track pitch, and a sixth video head of right and azimuth arranged at 180 degrees. And a right azimuth fourth audio head are arranged at 180 degrees, and the third video head and the sixth video head are
Since each pair of the fourth video head and the fifth video head, the first audio head and the fourth audio head, and the second audio head and the third audio head is configured as a double azimuth type, the fifth And the sixth video head allows video to be recorded on a video tape six times as long as in the standard mode. Also, the third
And the fourth audio head is capable of recording sound on a video tape for six times the time in the standard mode. In addition, special reproduction such as still and slow can be performed on the recorded video using the third, fifth, and sixth video heads or the fourth, fifth, and sixth video heads. it can. Further, there is an effect that compatibility at the time of reproduction can be easily maintained between the magnetic recording / reproducing devices.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a rotary head of an S-VHS type VTR according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram illustrating a recording system of an S-VHS VTR.

FIG. 3 is a schematic block diagram showing a reproduction system of an S-VHS type VTR.

FIG. 4 is a graph showing the linearity of a recording track of an S-VHS VTR.

FIG. 5 is an explanatory diagram showing an overlap between a recording track of a video signal and a recording track of an audio signal in the deep recording method.

FIG. 6 is a graph in which the degree of separation between a reproduced video signal and an audio signal is plotted against the degree of overlap between a recording track of a video signal and a recording track of an audio signal.

FIG. 7 is a graph in which the degree of separation between a reproduced video signal and an audio signal is plotted against the degree of overlap between a video head and a recording track of an adjacent audio signal.

FIG. 8 is a VHS VT according to a second embodiment of the present invention.
FIG. 3 is a configuration diagram schematically illustrating a rotating head of R.

FIG. 9 is a schematic block diagram showing a main part of a VTR using the rotary head of FIG. 8;

FIG. 10 is a schematic block diagram of a delay circuit in the VTR of FIG. 9;

11 is a timing chart of control pulses in the VTR of FIG.

FIG. 12 is an explanatory diagram showing a recording pattern on a video tape when recording is performed by the rotary head of FIG. 8;

FIG. 13 is an explanatory diagram showing a recording pattern on a video tape when recording is performed by the rotary head of FIG. 1;

14 is a graph showing the result of measuring the magnitude of crosstalk from an adjacent track with respect to frequency when the azimuth angle of the audio head for the AP mode (6 × mode) is set to ± 30 ° with the rotary head of FIG. 8; It is.

FIG. 15 is a graph showing the result of measuring the magnitude of crosstalk from an adjacent track with respect to frequency when the azimuth angle of the audio head for the AP mode (6 × mode) is set to ± 40 ° with the rotary head of FIG. 8; It is.

16 is a graph showing the result of measuring the magnitude of crosstalk from an adjacent track with respect to frequency when the azimuth angle of the EP mode (triple mode) audio head is set to ± 30 ° with the rotary head of FIG. 8; It is.

17 is a graph showing the result of measuring the magnitude of crosstalk from an adjacent track with respect to frequency when the azimuth angle of the audio head for EP mode (triple mode) is set to ± 30 ° in the rotary head of FIG. 8; It is.

FIG. 18 is a configuration diagram schematically showing a rotary head of a conventional VTR.

[Explanation of symbols]

 Reference Signs List 10 rotating head 10 'rotating head 17 video tape 50 rotating drum 51L video head (first video head) 51R video head (second video head) 52L video head (third video head) 52R video head (fourth video head) 53L Video head (fifth video head) 53R video head (sixth video head) 53L 'video head 53R' video head 54L video head 54R video head 55L audio head (first audio head) 55R audio head (second audio head) 56L Audio head (third audio head) 56R Audio head (fourth audio head) 82 Delay circuit (delay means) 83a Switch (switch means, switch means) 83b Switch (switch) Stage, switching means) 86 delay circuit (delay means) 87 synchronization separation circuit (switching means) 88 microcomputer (control means)

Claims (7)

(57) [Claims] 1. A magnetic recording / reproducing apparatus comprising a rotating head having at least one pair of video heads on a rotating drum and recording and reproducing video on a video tape, wherein the head width of the video head is 6 times the standard mode track pitch. It is set to be wider than one-third and narrower than one-third.
0 + α) degrees, and α is a quarter of one horizontal scanning period.
Is set to the angle at which the rotating drum rotates during the period
Set the feed rate of the video tape to 6 times that of the standard mode.
A magnetic recording / reproducing apparatus for recording / reproducing a video in one-half. 2. A magnetic recording / reproducing apparatus which comprises a rotating head having at least one pair of video heads on a rotating drum and records and reproduces an image on a video tape, wherein the head width of the video head is 6 times the standard mode track pitch. It is set to be wider than one-third and narrower than one-third.
0 + α) degrees, and α is a quarter of one horizontal scanning period.
Is set to the angle at which the rotating drum rotates during the period
There are provided delay means for delaying a recording signal and a reproduction signal by a half integral multiple of one horizontal scanning period, and switching means for switching and outputting a signal delayed by the delay means and a signal not delayed for each frame. When recording / reproducing a video at a video tape feed speed of 1/6 of the feed speed in the standard mode, a delayed recording signal and a non-delayed recording signal are switched for each frame. The video is recorded, the playback signal corresponding to the undelayed recording signal is delayed, and the delayed playback signal and the undelayed playback signal are mixed so that the playback signal corresponding to the delayed recording signal is not delayed. A magnetic recording / reproducing apparatus characterized in that a video is reproduced by switching every frame. 3. A magnetic recording / reproducing apparatus which comprises a rotating head having at least one pair of video heads on a rotating drum and records and reproduces an image on a video tape, wherein the head width of the video head is 6 times the standard mode track pitch. It is set to be wider than one-third and narrower than one-third.
0 + α) degrees, and α is a quarter of one horizontal scanning period.
Is set to the angle at which the rotating drum rotates during the period
There are provided delay means for delaying a recording signal and a reproduction signal by a half integral multiple of one horizontal scanning period, and switching means for switching and outputting a signal delayed by the delay means and a signal not delayed for each frame. The switching means includes a switch means for switching a signal delayed by the delay means and a signal not delayed for each frame during recording, and a switching pulse for alternately switching a video head for each field. The control means generates a control pulse for switching the switch means by dividing the frequency by two. The feed rate of the video tape is set to six times the feed rate in the standard mode.
When recording / reproducing a video in one-half, a video signal is recorded by switching between a delayed recording signal and a non-delayed recording signal for each frame, and a reproduction signal corresponding to the non-delayed recording signal is delayed. A magnetic recording / reproducing apparatus for reproducing a video by switching between a delayed reproduced signal and a non-delayed reproduced signal for each frame so as not to delay a reproduced signal corresponding to the delayed recording signal. . 4. A magnetic recording / reproducing apparatus which comprises a rotating head having at least one pair of video heads on a rotating drum and records and reproduces an image on a video tape, wherein the head width of the video head is 6 times the standard mode track pitch. It is set to be wider than one-third and narrower than one-third.
0 + α) degrees, and α is a quarter of one horizontal scanning period.
Is set to the angle at which the rotating drum rotates during the period
There are provided delay means for delaying a recording signal and a reproduction signal by a half integral multiple of one horizontal scanning period, and switching means for switching and outputting a signal delayed by the delay means and a signal not delayed for each frame. The switching means includes: a switch means for switching, on a frame-by-frame basis, between a signal delayed by the delay means and a signal not delayed during reproduction, a synchronization separation circuit for separating a vertical synchronization signal from a reproduction signal; Control means for generating a control pulse for switching the switch means so that the time interval of the vertical synchronizing signal is 1/60 second. The feed rate of the video tape is 6 times the feed rate in the standard mode.
When recording / reproducing a video in one-half, a video signal is recorded by switching between a delayed recording signal and a non-delayed recording signal for each frame, and a reproduction signal corresponding to the non-delayed recording signal is delayed. A magnetic recording / reproducing apparatus for reproducing a video by switching between a delayed reproduced signal and a non-delayed reproduced signal for each frame so as not to delay a reproduced signal corresponding to the delayed recording signal. . 5. A magnetic recording / reproducing apparatus comprising a rotary head having at least one pair of video heads and one pair of audio heads on a rotary drum and recording and reproducing video and audio on a video tape. Is set to be wider than one sixth of the track pitch in the standard mode and narrower than one third of the track pitch in the standard mode, and the pair of video heads are arranged at (180 + α) degrees on the rotating drum. α is set to an angle at which the rotating drum rotates during a quarter of one horizontal scanning period. The pair of audio heads are arranged at 180 degrees on the rotating drum, and the feed speed of the video tape is reduced. A magnetic recording / reproducing apparatus for recording and reproducing video and audio at 1/6 the feed rate in the standard mode. 6. The magnetic recording / reproducing apparatus according to claim 5, wherein the azimuth angles of the pair of audio heads are set to about 40 ° left and right. 7. A left azimuth first video head and a right azimuth second video head having a head width equal to a track pitch are arranged 180 degrees on a rotating drum,
A left azimuth third video head and a right azimuth fourth video head having a head width equal to one third of the track pitch are arranged at 180 degrees, and are wider than one third of the track pitch. A rotating head in which a left azimuth first audio head and a right azimuth second audio head having a head width smaller than the track pitch are arranged at 180 degrees, and in the standard mode, the first and second video heads In the magnetic recording / reproducing apparatus for recording an image on a video tape by using the third and fourth video heads in the triple mode, a 1/6 of the track pitch is provided on the rotating drum. A fifth azimuth video head and a right azimuth fifth video head having a head width wider than and less than one third of the track pitch. A third azimuth audio head and a right azimuth fourth audio head having a video head arranged 180 degrees and having a head width wider than one sixth of the track pitch and smaller than one third of the track pitch. Audio heads are arranged at 180 degrees, and the third video head and the sixth video head, the fourth video head and the fifth video head, the first audio head and the fourth audio head, and the second A magnetic recording / reproducing apparatus, wherein each pair of an audio head and a third audio head is configured as a double azimuth type.