JPH03125318A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To accomplish the special reproducing of both fields without lowering S/N by providing a standard head and a special head spaced at a specified angle and switching a standard signal and a special signal to a delayed signal at the time of special reproducing. CONSTITUTION:R and L azimuth heads 1 and 2 for standard recording and reproducing and L' and R' azimuth heads 3 and 4 for special reproducing are attached to a rotary cylinder 5 spaced at the specified angle theta (30-90 deg.), and delay units 10 and 11 which delay output from the heads 3 and 4 layer than that of the heads 1 and 2 by the amount of the angle theta are connected to a circuit. By transmitting a reproducing signal from the heads 1 and 2 at the time of standard reproducing and giving the signal from the heads 3 and 4 to the delay circuits 10 and 11 at the time of special reproducing, the signals of the heads 3 and 4 are switched by synchronizing with the reproducing output of the heads 1 and 2. Therefore, the reproducing of both fields is performed at the time of special reproducing such as still reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a magnetic recording/reproducing apparatus which is capable of realizing reproduction of both fields during special reproduction in a rotary head azimuth recording type VTR.

BACKGROUND OF THE INVENTION In recent years, in rotary head azimuth recording type VTRs, reproduction of both fields during special reproduction has been realized by combining heads of different azimuths.

An example of the above-mentioned conventional magnetic recording/reproducing device will be described below with reference to the drawings.

FIG. 3 shows the circumference of a rotary head cylinder of a conventional magnetic recording/reproducing apparatus, and FIG. 4 is a block diagram for switching the head output during special reproduction.

In FIGS. 3 and 4, 31 is an R azimuth head for recording and reproduction, 32 is an L azimuth head for recording and reproduction, and 33 is an R azimuth head for recording and reproduction 91.6
34 is the L' azimuth head for special reproduction, which is installed at a distance within 100 degrees from the L' azimuth head 32 for recording and reproduction. This is an R' azimuth head for special reproduction that is attached within a distance of 5 degrees, and 36 is a cylinder that rotates the attached head. Also, 36, 37, 38, and 39 are head amplifiers that amplify the outputs from the heads 31, 32, and 33.34, respectively, and 40, 41 are the magnitudes of the outputs from the head amplifiers 36, 38, and 37, 39, respectively. 42°43 is the comparator 40.41
44 is a reproduction output magnitude switch that switches the output of the head amplifiers 36, 38 and 37, 39 by signals from the head amplifiers 36, 37, and 37, respectively, and 44 switches the output by the H3W pulse 45 that can determine which head is currently in contact with the tape. H
It is a 3W switch.

The operation of the conventional magnetic recording/reproducing apparatus configured as described above will be described below.

Assume now that the head trajectory during still playback is at the position shown in FIG. 31. When the combination head R and L' of 33 comes into contact with the tape, the head output is output from the head amplifier 3.
6.38 and sent to the reproduction output main switch 42 and the comparator 40.

The reproduction output main switch 4 is activated by the signal from the comparator 4o.
2 passes the one with higher reproduction output. On the other hand, 32°34 glue, R
When the combination head ' comes into contact with the tape, the head output is amplified by head amplifiers 37 and 39 and sent to a reproduction output level switch 43 and a comparator 41. Based on the signal from the comparator 41, the reproduction output main switch 43 passes the higher reproduction output. Then, the output of the playback output major switcher 42, 43 is H3W4g, H3W switcher 4.
4, the signal from the side that the tape is currently in contact with is sent to the next stage video circuit.

Problems to be Solved by the Invention However, in the above configuration, even during standard recording and reproduction, the special reproduction heads 33 and 34 adjacent to the recording and reproduction heads 31 and 32, respectively, cause the recording and reproduction heads 31 and 32 to The contact ratio between the magnetic tape and the magnetic tape decreases, resulting in a decrease in performance such as S/N.

In view of the above problems, the present invention provides an S/N ratio during standard recording and reproduction.
The present invention provides a magnetic recording and reproducing device that enables special reproduction of both fields without degrading performance.

Means for Solving the Problems In order to solve the above problems, the magnetic recording device of the present invention has the following features:
In a rotary head azimuth recording type VTR, two first azimuths, an R azimuth and an L azimuth, are located diagonally to each other for recording and standard playback. the second head and the first head; The first head is placed independently at a position sufficiently distant from the second head. R azimuth for special playback that plays the same track as the second head;
L azimuth of two mutually diagonal 3rd. a rotating cylinder in which a fourth head is disposed;
head and the third head. The first... a reproduction output delay section that delays the reproduction output reproduced from the second head; and a reproduction output delay section that delays the reproduction output reproduced from the second head; The reproduction output signal from the second head and the third head. The apparatus further includes a switching circuit that switches between the reproduced output from the fourth head and the signal delayed by the reproduced output delay section.

According to the present invention having such characteristics, the first. A second head and a third head for special playback. A fourth head is placed on the rotating cylinder at a predetermined angle apart, and during standard playback, the first... The second head is designed to obtain the υ reproduction signal. Also, during special playback, the 3rd. By applying the signal obtained from the fourth head to the delay circuit, the signals of the first to fourth heads are switched in synchronization with the reproduction output from the first and second heads.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the circumference of the rotary head cylinder, and FIG. 2 is a block diagram for changing the direction of the head during special playback. In FIGS. 1 and 2, 1 is an R azimuth head (first head) for recording and reproduction, and 2 is an L azimuth head for recording and reproduction.
This is an azimuth head (second head).

3 and 4 are L' and R' azimuth heads for special playback, respectively, and a third head that plays the same track as heads 1 and 2.
This is the fourth head. Each of these heads 1 to 4 is attached to a rotating cylinder 5 as shown in FIG. The special reproduction head 3.4 is mounted at a position rotated by a predetermined angle θ0, for example, 30 degrees to 90 degrees, so as not to affect the recording and reproduction heads 1 and 2. Further, 6, 7, 8.9 are head amplifiers that amplify the output from each head 1 to 4, and IQ, 11 is a delay device that temporally delays the output of heads 3 and 4 by an angle of 0 minutes. . 12゜13 is a comparator that compares the magnitude of the output from the head amplifiers 6.8, 7, and 9, and 14.15 is a comparator that compares the magnitude of the output from the head amplifiers 6.8, 7, and 9. 14.15 uses the signal from the comparator 12.13 to 16 is the H3W pulse 1 which can determine which head is currently in contact with the tape.
This is an H5W switch that switches by 7.

The operation of the magnetic recording/reproducing apparatus of this embodiment configured as described above will be described below.

Assume now that the head trajectory during null reproduction is at the position shown in FIG. When R and L/heads 1 and 3 are in contact with the tape, the head output is 6.8 from the head amplifier.
The output of the head amplifier 6 is directly amplified, and the output of the head amplifier 8 is delayed by a delay device 10 and sent to a reproduction output level switch 14 and a comparator 12. Comparator 12
The reproduction output level switch 14 passes the higher reproduction output signal. On the other hand, when the heads 2 and 4 of L and R/ come into contact with the tape, the head output is amplified by the head amplifier 7.9, the output of the head amplifier 7 is directly transmitted, and the output of the head amplifier 9 is transmitted by the delay device 11. The signal is delayed and sent to the reproduction output level switch 16 and the comparator 13. Based on the signal from the comparator 13, the reproduction output level switch 15 passes the higher reproduction output. The output of the playback output level switch 14.15 is H8W17. The H3W switch 16 sends the signal on the side that the tape is currently in contact with to the next-stage video circuit.

Effects of the Invention As described above, according to the present invention, two heads, R azimuth and L azimuth, which perform recording and standard reproduction, which are located diagonally to each other, are mounted on a rotating cylinder, and the recording and reproduction head and the magnetic tape are connected to each other. independently in a position that does not cause a decrease in contact rate,
Two heads, R azimuth and L azimuth, which perform special reproduction are arranged diagonally to each other, and reproduction output is produced for a time corresponding to the distance on the circumferential angle between the recording and reproduction head and the special reproduction head. and a playback output delay section that delays the playback output signal from the recording/playback head and the playback output from the special playback head during special playback such as still playback. Since the signals are switched, both fields can be reproduced during special reproduction such as still reproduction. Further, even during standard recording and reproduction, an excellent effect can be obtained in that a decrease in the S/N ratio due to a decrease in the contact ratio between the magnetic tape and the head can be eliminated.

[Brief explanation of the drawing]

FIG. 2 is a schematic diagram showing tracks on a slab; 1... R azimuth head for recording and playback, 2. Old.
・L azimuth head for recording and playback, 3... R/Ashimanu head for special playback, 4. Old... L' azimuth head for special playback, 6... Rotating cylinder, 6, 7,
Head amplifier for 8.9..., 10.11...
Delay device, 12, 13... Comparator, 14.15
...... Playback output large/small υ changer, 16...
・H3W switch.

Claims (1)

[Claims] In a rotary head azimuth recording type VTR, two first and second heads, R azimuth and L azimuth, which perform recording and standard playback, are located diagonally to each other and are located independently at a position sufficiently distant from the first and second heads. , an R azimuth for special playback that plays the same track as the first and second heads;
a rotary cylinder in which two third and fourth heads of L azimuth are arranged diagonally to each other;
a reproduction output delay unit that delays the reproduction output reproduced from the first and second heads by a time corresponding to the circumferential angular distance between the head and the third and fourth heads, still reproduction, etc. and a switching circuit that switches between the reproduction output signals from the first and second heads and the reproduction output from the third and fourth heads delayed by the reproduction output delay section during special reproduction. magnetic recording and reproducing device.