JPH0388487A - Video floppy device - Google Patents

Abstract

PURPOSE:To reduce wear or damage of a magnetic disk or a video head by storing a video signal reproduced from the magnetic disk into a video memory at reproduction for a long period and reading the video signal stored in the video memory. CONSTITUTION:A selection circuit 4 selects whether a video signal outputted to an output terminal 5 is used for an output of a video signal processing circuit 2 or for a readout signal of a video memory 3. In the case of a long period reproduction mode, a switching signal S1 is fed to the selection circuit 4 from a controller 6, the selection circuit 4 is turned as shown in dotted lines in figure and the video signal stored in the video memory 3 is read out and outputted to the output terminal 5. Since it is not required to reproduce the video signal from a magnetic disk in the long period reproduction mode, the controller 6 supplies a switching signal S2 to stop the operation of a magnetic disk drive 7. Thus, wear or damage of the magnetic disk or the video head 1 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video floppy device suitable for long-term reproduction of video signals recorded on a magnetic disk.

[Conventional technology]

A video floppy device that records and plays video signals using a rotating disk-shaped magnetic recording medium (magnetic disk: video floppy) is itself a video storage means, so video floppy devices such as frame memory, field memory, etc. It has no memory. However, unlike a VTR, this type of video floppy device can store only a small number of frames of video signals, such as 50 fields on a 2.5-inch magnetic disk.

In such a video floppy device, each field or frame (hereinafter referred to as a field) usually constitutes an independent still image, and the VT
Unlike R, it is often used to repeatedly reproduce one field video signal recorded on a magnetic disk.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, no consideration is given to wear and damage of the magnetic film of the magnetic disk due to repeated playback of the green signal of the same video signal for a long time, and the video signal output decreases with repeated playback. However, there have been problems such as deterioration of image quality, shortening of the lifespan of the video head, and deterioration of image quality due to clogging of the head.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video floppy device that solves the problems of the prior art described above and is capable of reproducing the same video signal for a long time.

[Means to solve the problem]

The above purpose is to provide a video memory for storing playback signals from a magnetic disk, and a selection means for selecting and outputting a playback signal from the magnetic disk and a read signal from the video memory. This is achieved by storing the video signal reproduced from the disc in a video memory and reading out the video signal stored in the video memory.

[Operation] The video memory stores one field worth of video signals reproduced from the magnetic disk, and during long-time reproduction, the video signals are read from this video memory and output to the outside.

Furthermore, when a large number of video signals recorded on a magnetic disk are to be quickly reproduced, the reproduction signal of the magnetic disk is directly outputted to the outside, thereby performing a search without delay in operation. The selection means selects the above re-output.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating an embodiment of a video floppy device according to the present invention, in which l denotes a video head, 2
3 is a video signal processing circuit, 3 is a video memory circuit, 4 is a selection circuit, 5 is an output terminal, 6 is a controller, and 7 is a disk drive.

In the figure, a video head 1, which is a magnetic head, is connected to a magnetic disk (not shown) mounted on a disk drive 7.
To reproduce a recorded signal of a video signal recorded in units of one field from a video floppy. The reproduced signal is supplied to the output terminal 5 or the video memory circuit 3 as a video signal V through the video signal processing circuit 2.

This video memory circuit 3 can be the same as that mounted on a VTR.

The selection circuit 4 selects whether the video signal output to the output terminal 5 should be the output of the video signal processing circuit 2 or the readout signal of the video memory 3, and the selection signal is applied from the controller 6. Ru.

The controller 6 is composed of, for example, a microcomputer, and controls the overall operation of the video floppy device, as well as
A selection signal (switching signal) is supplied to the selection circuit 4. The selection circuit is normally in the state shown by the solid line in the figure, so that the reproduced video signal from the magnetic disk that has passed through the video signal processing circuit 2 is output as is to the output terminal 5.

On the other hand, in the long-time playback mode, a switching signal is applied from the controller 6 to the selection circuit, the selection circuit 4 is switched as shown by the dotted line in the figure, and the video signal stored in the video memory 3 is read out. and output to the output terminal 5.

This switching signal S may be generated by setting an arbitrary time in a timer built into the controller 6 and creating a switching signal using the time-up signal, or by creating a switching signal at the time when the video signal is stored in the video memory 3 ( The switching signal may be generated at the time when the memory writing is completed.

In the long-time playback mode, there is no need to play back the video signal from the magnetic disk, so the controller 6 outputs the switching signal S2.
is supplied to the disk drive 7 to stop the operation of the magnetic disk drive 7.

As a result, wear and damage to the video head and magnetic disk can be significantly reduced, and power consumption can also be saved.

In addition, when it is necessary to switch images quickly, such as when quickly viewing video signals recorded on a magnetic disk, the video signal from the video signal processing circuit can be sent to the output terminal 5 without going through the video memory. By outputting directly, it is possible to perform a search without time delay.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a video floppy device that reduces wear and damage on magnetic disks and video heads, significantly extends their lifespan, and enables long-time video signal playback. can.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an embodiment of a video floppy device according to the present invention. ■...Video head, 2...Video signal processing circuit, 3...Video memory circuit, 4...Selection circuit,
5...Output terminal, 6...Controller, 7...
...Disk drive. Fig. 1 1° Video head 2: 1 E 1 Tortoise processing circuit 3 - Path output 5: Output end J 6 Controller 7: Di 4λ actuator 5 1

Claims (1)

[Scope of Claims] 1. A video floppy device that has a magnetic disk, a magnetic disk recording/reproducing means, and a video signal processing circuit, records a video signal, and plays back the video signal, in which a playback signal from the magnetic disk is stored. A video floppy device comprising: a video memory; and selection means for selecting and outputting a reproduction signal from a magnetic disk and a read signal from the video memory. 2. The video floppy device according to claim 1, further comprising magnetic disk playback operation stop means for stopping the playback operation of the magnetic disk when a playback signal of the video memory is selected.