JPH05210802A - Magnetic recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to reproduce all information on the magnetic tape even during slow and high-speed reproduction. [Structure] Recording / reproducing head 11 and recording / reproducing head 12,
The reproducing head 13 and the reproducing head 14 form a pair of rotating heads facing each other by 180 ° and having an inverse azimuth angle.
Each of the heads 11 to 14 is attached to the AT elements 15 to 18, and the AT elements 15 to 18 are attached to the upper cylinder 10. The AT elements 15 to 18 have the respective heads 11 to 1
4 is moved in parallel with the rotation axis of the upper cylinder 10. Each head 11 to 14 selected by the switches 20 and 21
The reproduction signal from is amplified by the amplifier 23 and is delayed by the delay device 24.
Is input to. The input signal is delayed by the delay unit 24 for each signal.
After being delayed by, the signals are added by the adder 25 and demodulated by the demodulator 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus applied to a field requiring special reproduction such as noiseless slow motion.

[0002]

2. Description of the Related Art In recent years, technological innovations in magnetic recording / reproducing devices have been
There are remarkable ones, and VTRs developed for consumer use have also been developed for commercial use, more advanced image processing has been demanded, noiseless slow speed and high speed reproduction have been required. A conventional magnetic recording / reproducing apparatus will be described with reference to FIG. FIG. 3 shows an upper cylinder to which a rotary head is attached in a conventional magnetic recording / reproducing apparatus.
In FIG. 3, reference numerals 1 and 2 denote recording / reproducing heads. The recording / reproducing head 1 and the recording / reproducing head 2 face each other by 180 ° and have opposite azimuth angles. Reference numerals 3 and 4 denote reproducing heads. The reproducing head 3 and the reproducing head 4 face each other by 180 ° and have the same azimuth angle as the recording / reproducing head 1. Reference numeral 5 is an element for moving the reproducing head 3 in parallel with the rotation axis of the cylinder 7.
It is called an (auto tracking) element.
Reference numeral 6 is an element for moving the reproducing head 4 perpendicularly to the rotation direction of the cylinder 7, and similar to 5, is called an AT element.

The operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described. Recording and normal reproduction are performed by the recording / reproducing heads 1 and 2. AT for slow and high speed playback
The elements 5 and 6 are moved, the reproducing head 3 and the reproducing head 4 are made to follow the recording pattern on the tape, magnetic reproduction is performed, and a good reproduced image is obtained.

[0004]

However, since the reproducing head 3 and the reproducing head 4 have the same azimuth angle as that of the recording / reproducing head 1 in the above-mentioned conventional structure, only one field is reproduced during slow and high speed reproduction. For this reason,
There was a problem that switching from normal playback to slow and high speed playback was not smooth.

An object of the present invention is to provide a magnetic recording / reproducing apparatus capable of reproducing all information on a magnetic tape even in slow and high speed reproduction in order to solve the above problems.

[0006]

In the magnetic recording / reproducing apparatus of the present invention, a plurality of rotary head pairs facing each other by 180 ° and having an inverse azimuth angle, and each rotary head of the plurality of rotary head pairs are movable in parallel with a rotation axis. The present invention is characterized in that it comprises head moving means for effecting, delay means for delaying the signal reproduced by each rotary head for each signal, and synthesizing means for synthesizing the signals delayed by this delay means.

[0007]

According to the structure of the present invention, each rotary head of a plurality of rotary head pairs facing each other by 180 ° and having an inverse azimuth angle is moved in parallel with the rotary shaft, and the signals reproduced by each rotary head are converted into respective signals. By synthesizing after delaying each time, it is possible to select the reproducing head according to the azimuth angle recorded on the magnetic tape during slow and high speed reproduction.
All information on the magnetic tape can be reproduced.

[0008]

1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 10 is an upper cylinder, 11 and 12 are recording / reproducing heads, and the recording / reproducing head 12 faces the recording / reproducing head 11 by 180 ° and has an inverse azimuth angle. A reproducing head 13 has a reverse azimuth angle with the recording / reproducing head 11. A reproducing head 14 faces the reproducing head 13 by 180 ° and has an inverse azimuth angle with the recording / reproducing head 12. Reference numeral 15 is an AT element to which the recording / reproducing head 11 is attached. Reference numeral 16 is an AT element to which the recording / reproducing head 12 is attached. Reference numeral 17 is an AT element to which the reproducing head 13 is attached. 18 is A
The reproducing head 14 is attached to the T element. 20
Is a switch for switching the output of the recording / reproducing head 11 and the reproducing head 13. Reference numeral 21 is a switch for switching the output of the recording / reproducing head 12 and the reproducing head 14. A head switch controller 19 controls the switches 20 and 21. An amplifier 22 receives the output from the switch 20. An amplifier 23 receives the output from the switch 21. Reference numeral 24 is a delay device (delay means) which receives the outputs from the amplifiers 22 and 23 and delays each input. Reference numeral 25 is an adder (combining means), and 26 is a demodulator. AT
The elements 15 to 18 are head moving means attached to the upper cylinder 10, respectively, and moving the recording / reproducing or reproducing heads 11 to 14 attached to the respective elements in parallel to the rotation axis of the upper cylinder 10. The recording / reproducing head 11 and the recording / reproducing head 12, and the reproducing head 13 and the reproducing head 14 respectively form a rotary head pair.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described with reference to FIG. 2 shows a tape pattern recorded by this magnetic recording / reproducing apparatus. In FIG. 2, a pattern recorded on the magnetic tape 27 by the recording / reproducing head 11 is recorded on a track Rn (n is 1,
2, 3, 4, ...) and the pattern recorded on the magnetic tape 27 by the recording / reproducing head 12 is recorded on the track Ln (n is 1,
2, 3, 4, ...). Further, in FIG. 1, the rotation direction of the upper cylinder 10 is the direction of the arrow in the drawing.

At the time of still operation, the AT element 15 is moved, and the recording / reproducing head 11 traces the track R1. Next, the AT element 18 is moved, and the track R is reproduced by the reproducing head 14.
Trace 1. With this series of operations, the track R1 is repeatedly reproduced by the recording / reproducing head 11 and the reproducing head 14. Then, the reproduction signal of the reproducing head 14 is delayed by the delay device 24 by the time with the recording / reproducing head 12 and added by the adder 25 to obtain a continuous signal.
After that, it is demodulated by the demodulator 26 and output. Also,
A frame still can be obtained by reproducing the track R1 with the recording / reproducing head 11 and reproducing the track L1 with the recording / reproducing head 12.

In slow reproduction, the track R1 is reproduced by the recording / reproducing head 11 and the reproducing head 14 a predetermined number of times as in the still state, and then the track L1 is reproduced by the recording / reproducing head 12 and the reproducing head 13 a predetermined number of times. This series of operations is repeated as track R2, track L2, .... At the time of high speed reproduction, for example, at a double speed, the track R1 is reproduced by the recording / reproducing head 11, the track L1 is reproduced by the recording / reproducing head 12, and then the track R3 and the track L are reproduced.
3, and so on.

As described above, according to this embodiment, since the recording / reproducing heads 11 and 12 are provided with the AT elements 15 and 14, a good frame still can be obtained. Further, by providing the reproducing heads 13 and 14 with the AT elements 17 and 18 and setting the reproducing head 13 and the reproducing head 14 to have opposite azimuth angles, all the tracks can be reproduced by still and slow, and at the time of high speed reproduction, the frames can be reproduced. Since it can be reproduced in units, a clearer image can be obtained. Further, the reproducing head 13 (14) adjacent to the recording / reproducing head 11 (12) has a reverse azimuth angle, so that, for example, normal reproduction from slow speed
The transition to high-speed playback can be smoothed continuously.

[0013]

According to the structure of the present invention, each rotary head of a plurality of rotary head pairs facing each other by 180 ° and having an inverse azimuth angle is moved in parallel with the rotary shaft, and a signal reproduced by each rotary head is transmitted. By delaying each signal and then synthesizing them, it is possible to select a reproducing head according to the azimuth angle recorded on the magnetic tape during slow and high speed reproduction, and reproduce all information on the magnetic tape. .. As a result, a good frame still can be obtained at the time of still, and a clear image without noise can be obtained at the time of slow reproduction. Further, since high-speed reproduction can be performed frame by frame, a clearer image can be obtained. Furthermore, the transition of the speed mode, for example, the transition from slow to normal reproduction and high speed reproduction can be continuously smoothed.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a tape pattern in the same embodiment.

FIG. 3 is a block diagram of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 11 recording / reproducing head (rotating head) 12 recording / reproducing head (rotating head) 13 reproducing head (rotating head) 14 reproducing head (rotating head) 15 AT element (head moving means) 16 AT element (head moving means) 17 AT element ( Head moving means) 18 AT element (head moving means) 19 Head switch controller 20 Switch 21 Switch 22 Amplifier 23 Amplifier 24 Delay device (delay means) 25 Adder (combining means) 26 Demodulator

Claims (1)

[Claims] 1. A helical scan type magnetic recording / reproducing apparatus for forming tracks obliquely to the longitudinal direction of a magnetic tape, comprising a plurality of pairs of rotary heads facing each other at 180 ° and having an inverse azimuth angle, and a plurality of these heads. Head moving means for moving each rotary head of the rotary head pair parallel to the rotation axis, delay means for delaying the signal reproduced by each rotary head for each signal, and each signal delayed by this delay means A magnetic recording / reproducing apparatus comprising: a synthesizing unit for synthesizing.