JPS63197182A - Vtr device - Google Patents

Abstract

PURPOSE:To perform the clear reproduction of a still picture with two heads, by connecting slidably the head on one side with the same track recorded in the same azimuth repeatedly, converting a signal to a video signal, and outputting it after delaying by one horizontal scanning period by a delay means. CONSTITUTION:When the heads R and L are connected slidably with a recording tape 2 with the same locus C being superposed on the same track TR recorded in the azimuth of the head R, the signal is reproduced from the head R on one side, and no signal is outputted from the head L on the other side since the azimuth is different. And while the head is connected slidably with the recording tape 2, the contact (a) of a head switch 6 is controlled so as to be connected to a common terminal (c), and the output of the head R is supplied to a video reproduction processing circuit 10 at every two horizontal scanning periods. Therefore, the video signal is supplied from the video reproduction processing circuit 10 to an output terminal 12 and a delay circuit 13 at every two horizontal scanning periods. And the video signal delayed only by one horizontal scanning period is supplied from the delay circuit 13 to the output terminal 12. In such a way, it is possible to perform the clear reproduction with high definition of the still picture.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a VTR device that is capable of reproducing high-quality and clear still images even though it has two heads.

(Prior Art) In a two-head VTR device, as shown in FIGS. 4 and 5, two heads R and L having different azimuths are disposed at positions 180 degrees apart on a cylinder 1. Then, insert the recording tape 2 into this cylinder 1 at an angle of about 180 degrees.
is wrapped around. This recording tape 2 has tracks TR recorded at azimuths corresponding to the two heads R and L.
9TLs are arranged alternately. Then, when playing a still image, two adjacent tracks TR and T with different azimuths are displayed.
The heads R and L repeatedly slide into contact with the recording tape 2 alternately along the same locus A that spans the recording tape 2. Then, one head R plays back the track TR recorded with the azimuth of head R, and the other head L plays back the track TL recorded with the azimuth of head L. As a result, substantially the same signals are alternately and repeatedly output from the heads R and L to reproduce a still image.

In addition, in a three-head VTR device, as shown in FIGS. 6 and 7, two heads R and L with different azimuths are arranged at positions 180 degrees apart on cylinder 1, and one head R An auxiliary head L' having the same azimuth as the azimuth of the other head L is disposed close to.

Then, in still image playback, the head R,
L and the auxiliary head L' are repeatedly brought into sliding contact with the recording tape 2. Then, since the azimuth is different from one head R, no signal is output, and the head L and the auxiliary head L'
play tracks TL alternately. As a result, the same signal is alternately and repeatedly output from the head L and the auxiliary head L' to reproduce a still image.

(Problems to be Solved by the Invention) By the way, in the above-mentioned two-head VTR device,
Since there are two heads, the device can be manufactured at low cost, but there is a problem that the signals output from the heads R and L are not completely the same and the still image is slightly blurred.

In addition, in a three-head VTR device, the exactly same signal is output alternately from the head L and the auxiliary head L', resulting in clear still images, but since three heads are required, the head assembly is complicated. In addition to being expensive, the rotary transformer and other circuits are also more complex and expensive than a two-head VTR device, making the device expensive.

An object of the present invention was to solve the above-mentioned problems of conventional 2-head and 3-head VTR devices.
The purpose of this invention is to provide a TR device.

(Means for solving the problem) In order to achieve the above object, the VTR device of the present invention has the following features:
Two heads with different azimuths are arranged at 180 degrees different l6 positions on the cylinder, and the heads are rotated in sliding contact with a track recorded on a recording tape that is wound around the cylinder at an angle of about 180 degrees to reproduce video. In a VTR device, one of the heads is repeatedly brought into sliding contact with the same track recorded at the same azimuth as this head, and the output from this head is converted into a video signal by a video playback processing circuit and outputted to an output terminal. , the video signal is outputted to the output terminal with a delay of one horizontal scanning period by a delay means.

(Function) One of the two heads is repeatedly brought into sliding contact with the same track recorded at the same azimuth as this head, and the output of this head is converted to a video signal and output to the output terminal, and one horizontal Since the output is delayed by the scanning period and is output to the output terminal, a video signal with no delay is output during one horizontal scanning period when the signal is output from this head, and a video signal is delayed during the next horizontal scanning period when no signal is output from this head. The video signal is output. As a result, although it is a 2-head VTR device, completely the same signal is outputted to the output terminal without any loss, similar to a 3-head VTR device.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of a main part of an embodiment of the VTR device of the present invention, and FIG. 2 is a diagram showing the trajectory of the head relative to the track during still image playback of the VTR device of the present invention. .

In FIG. 1, two heads R and L with different azimuths are disposed at positions l6 180 degrees apart on a cylinder 1. The outputs of the heads R and L are respectively given to a reproduction amplifier 4.5 via a rotary transformer 3, and are appropriately amplified and output. The output of one of the playback amplifiers 4 is given to one contact a of the head switch 6, and the output of the other playback amplifier 5 is sent to the other side of the head switch 6 via a first switch 8 controlled by a mechanical control 7. given to the contact point. The head switch 6 is controlled by a head switch pulse generation circuit 9 that generates head switch pulses in accordance with the rotation angle of the cylinder 1. The common terminal C of the head switch 6 is connected via the video reproduction processing circuit 1O to the common terminal C of the second switch 11 controlled by the mechanical control 7, and the outputs of the heads R and L are converted into video signals. and is applied to the common terminal C of the second switch 11. Furthermore, one contact a of the second switch 11 is directly connected to the output terminal 12 and connected via a delay circuit 13 in parallel. Further, the other contact point of the second switch 11 is directly connected to the output terminal 12. The mechanical control 7 controls the first switch 8 so that the output of the playback amplifier 5 is not given to the head switch 6 during still image playback, and controls the second switch 1
1 is controlled so that the video signal is output to the output terminal 12 directly and via the delay circuit 13.

In such a configuration, as shown in FIG. 2, with the same trajectory C overlapping the track T recorded at the azimuth of the head R,
The heads R and L are repeatedly brought into sliding contact with the recording tape 2. Then, a signal is reproduced from one head R, and no signal is output from the other head L because the azimuth is different. Then, while the head R is in sliding contact with the recording tape 2, the head switch 6 is controlled so that the contact point a is connected to the common terminal C, and the output of the head R is given to the video reproduction processing circuit lO every horizontal scanning period. . For this purpose, a video signal is applied from the video reproduction processing circuit IO to the output terminal 12 and the delay circuit 13 every horizontal scanning period.

Then, a video signal delayed by one horizontal scanning period is applied from the delay circuit 13 to the output terminal 12.

As a result, the same video signal is alternately output from the video reproduction processing circuit 10 and the delay circuit 13 to the output terminal 12 every horizontal scanning period, and high-quality and clear still images are reproduced.

In addition, for normal image playback, mechanical control 7
In this case, the first and second switches 8.11 are connected in a different state from that shown in FIG.
The outputs are alternately given to the video reproduction processing circuit 10, converted into video signals, and outputted to the output terminal 12.

FIG. 3 is a block diagram of main parts of another embodiment of the VTR apparatus of the present invention. In FIG. 3, block circuits that are the same as those in FIG. 1 are given the same reference numerals and redundant explanations will be omitted.

The difference between FIG. 3 and FIG. 1 is that a memory 14 is provided in place of the delay circuit 13 in FIG. A signal is output from head R! A video signal for one horizontal scan is written in a horizontal scanning period, and a previously written video signal is read out in the next horizontal scanning period in which no signal is output from the head R.

As a result, the same video signal is alternately output from the video reproduction processing circuit 10 and the memory 14 to the output terminal 12 every horizontal scanning period, and a clear still image is reproduced.

In the above embodiment, the video signal converted by the video reproduction processing circuit IO is delayed by one horizontal scanning period in the delay circuit 13 or memory 14 serving as a delay means, but the output of the reproduction amplifier 4 is delayed by the video reproduction processing circuit IO. It is also possible to provide the signal directly to the video reproducing processing circuit 10, and to delay the signal by one horizontal scanning period via a delay means in parallel. Further, in the above embodiment, the head R was brought into sliding contact with the track TR recorded with the azimuth of this head R, but the head L was brought into sliding contact with the track TR recorded with the azimuth of this head L.
Of course, it may be configured so that it comes into sliding contact with L.

(Effects of the Invention) As explained above, the VTR device of the present invention has the excellent effect that high-quality and clear still image reproduction is performed, and the device can be manufactured at low cost with only two heads. play.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of main parts of an embodiment of the VTR device of the present invention, FIG. 4 is a block diagram of main parts of another embodiment of the VTR device of the present invention, FIG. 4 is a diagram showing a two-head arrangement, and FIG. 6 is a diagram showing the trajectory of the head relative to the track during image reproduction; FIG. 6 is a diagram showing the arrangement of three heads; FIG. 7 is a diagram showing the trajectory of the head relative to the track during still image reproduction of a conventional three-head VTR device It is a diagram showing a trajectory. 1 Nijilinda - 12: Recording tape, 10: Video playback processing circuit, 12: Output terminal, 13: Delay circuit, 14: Memory, R, L: Head, T, TL Nidorak, C: Locus.

Claims (3)

[Claims] (1) Two heads with different azimuths are connected to one of the cylinders.
arranged at 80 degree different positions, and approximately 180 degrees to the cylinder.
A VT that reproduces video by rotating the head in sliding contact with a track recorded on a recording tape that is wound at an angle of
In the R device, one of the heads is repeatedly brought into sliding contact with the same track recorded at the same azimuth as this head, and the output from this head is converted into a video signal by a video playback processing circuit and outputted to the output terminal. , a VTR characterized in that the video signal is output to the output terminal with a delay of one horizontal scanning period by a delay means.
Device. (2) The VTR apparatus according to claim 1, wherein the delay means is a delay circuit having a delay time of one horizontal scanning period. (3) The delay means is a memory that writes the video signal in one horizontal scanning period in which the one head outputs the signal and reads it in the next horizontal scanning period in which the one head does not output the signal. The VTR device according to scope 1.