JPH027782A - Video floppy recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent vertical fluctuation of a video image at mute release by using a synchronizing signal whose phase is matched with a synchronizing signal of the video image before muting and outputting it during mute period. CONSTITUTION:The title device is provided with a synchronizing signal generating means 14 reset by a vertical synchronizing signal and generating a synchronizing signal, a means 16 generating a mute video signal based on the synchronizing signal from the synchronizing signal generating means 14, a means 7 switching a video signal and a mute video signal and a means 17 generating a reference signal for spindle motor drive keeping a prescribed phase relation to the vertical synchronizing signal, a mute signal is generated during the track moving of a floppy disk 1 and a vertical synchronizing signal consecutive to the vertical synchronizing signal in the video signals after and before the mute period is outputted to a television receiver. Thus, the vertical fluctuation of the video signal after mute release is prevented.

Description

[Detailed Description of the Invention] The industrial field of application is the recording and recording of video signals on VideoFrombi discs.
This invention relates to a video floppy recording/playback device for playback.

BACKGROUND OF THE INVENTION In recent years, video floppies have attracted attention as still image information files, and are increasingly being commercialized as electronic still cameras.

A video floppy disk can record up to 50 still images on one disk, and it is common to record and play back on any desired track by moving the head in the radial direction of the disk. The time required for this truck movement is, for example, 25m5flc between adjacent trucks, and from the first to the fifth truck.
01-Rack movement is 1.25 SOC. During this time, the output image is distorted and unsightly, so the video output is muted.

An example of muting in a conventional video floppy recording/playback device will be explained with reference to FIG.

In Fig. 3, 31 is a video floppy disk on which still images are recorded, 32 is a magnetic head that reproduces signals from the floppy disk, and 33 is a hesodon amplifier that amplifies the reproduction signal reproduced from the floppy disk 32. 34 is a reproduction signal processing circuit, which performs various processes such as an FM demodulation circuit, de-emphasis, and other processing to produce a video signal. 38 is a head movement mechanism mainly composed of a step motor. 4o is an operation unit 39 is a control section that generates signals for controlling each block in response to inputs operated on the operation section 40. 36 is a video control section. A switch selects whether to output or mute the video signal. 36 is an output circuit.

The operation of the conventional example configured as described above will be explained below. Based on the input from the operating section 4o, the controller 1-roll section 39 calculates the amount of head movement and drives the step motor. The video floppy disk 31 has five concentric circles.
An image of the 01-rack is recorded, and the output image is disturbed due to reasons such as passage of a noise portion during head movement, that is, during movement from track to track. For this reason, the video is muted by switching the video switch 36 to DC potential for a predetermined period including the period of track movement.

Problems to be Solved by the Invention However, in the above configuration, since the mute release is switched from a DC potential to a video signal, the vertical deflection of the television receiver often cannot be synchronized with the first vertical synchronization signal. However, there was a problem in that the image was shaken in the vertical direction.

The present invention solves the above problem, and prevents the vertical fluctuation of the image when the mute is released by generating and outputting the mute image using a synchronization signal that is in phase with the synchronization signal of the image before muting during the mute period. The present invention provides a video floppy recording/playback device that allows the video floppy recording and playback to be performed in a manner similar to that described above.

Means for Solving the Problems In order to solve the above problems, the video floppy recording/playback device of the present invention includes means for determining the presence or absence of a vertical synchronization signal of a video signal reproduced from a video floppy, and a reset method based on the vertical synchronization signal. means for generating a signal, synchronization signal generation means for generating a synchronization signal by being reset by a vertical synchronization signal, means for generating a video signal for muting based on the synchronization signal from the synchronization signal generation means, and video signal and muting means. and means for generating a reference signal for spindle motor rotation that has a predetermined phase relationship with the vertical synchronization signal in the non-reset state of the synchronization signal generation means.

Effect of the Invention With the above-described configuration, the present invention generates a mute signal while moving tracks on a floppy disk, and outputs a vertical synchronization signal continuous with the vertical synchronization signals of the video signals before and after the mute period to a television receiver even during the mute period. This can prevent vertical fluctuations in the video signal after muting is released.

Embodiment Hereinafter, a video floppy recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a video floppy disk, 2 is a spindle motor, 3 is a motor control/drive circuit, 4 is a magnetic head, 6 is a head amplifier, 6 is a reproduction signal processing circuit,
8 is a mute switch, 8 is an output circuit, 9 is a video output terminal, 1o is a synchronization separation circuit, 11 is a reset generation circuit, 1
2 is a reset signal switch, 13 is a synchronization signal discrimination circuit,
14 is a synchronization signal generation circuit, 15 is a clock generation circuit, 1
6 is a mute signal generation circuit, 17 is a spindle motor reference signal generation circuit, 18 is a control section, 19 is an input operation section, and 20 is a head moving mechanism.

The video floppy disk 1 has a PG joke to indicate the position of one revolution, and the video signal is recorded based on this. Therefore, a constant phase relationship is maintained between the recorded vertical synchronization signal and the PG joke. ing. In addition to speed control, the spindle motor 2 is also subjected to phase control to keep the phase of the PG joke output and the motor reference signal constant. FIG. 4 shows the phase relationship between the vertical synchronization signal and the motor reference signal in the PG double signal reproduction signal.

Therefore, the vertical synchronization signal of the synchronization signal generation circuit 14, which is the vertical synchronization signal in the reproduced signal, which is multiplied by seven times, also has a constant phase relationship with the above three signals.

When the clock of the clock generation circuit 15 is set to 4f8° (f8C is the color subcarrier frequency of approximately 3.58MHz),
4f in the synchronization generation circuit 14. 1/(625X455
) to create a vertical synchronization signal and similarly generate a reference signal for the spindle motor in the reference signal generation circuit 17.
A reference signal is generated by frequency-dividing the f8C tarok by 1/(525×455). With this configuration, when the -degree synchronization generating circuit 14 is reset to match the phase relationship with the reference signal, the phase relationship is maintained even in the non-reset state.

The video signal recorded on video floppy disk 1 is 6
The phase relationship with respect to the PG yoke is maintained in all 0 tracks as described above, that is, the vertical synchronization signals of all 60 tracks are aligned in a line in the radial direction of the disk.

Track movement and signal waveforms before and after the movement will be explained with reference to FIG. The reproduced video signal from the video floppy disk is synchronized with the motor reference signal a. C is a vertical synchronization signal separated from the reproduced video signal, e is a set signal generated from the vertical synchronization signal, f is a vertical synchronization signal of the synchronization generation circuit 14 reset by this reset signal, and q is a vertical synchronization signal of the synchronization generation circuit 14 reset by this reset signal. An example of a mute signal generated from a signal is a so-called plasokbarmat signal. As you can see by comparing the reproduced video signal (Φ signal and mute signal q), even if there is noise during track movement, the phase relationship between the reproduced video signal and mute signal q is maintained.
The vertical synchronization signal C, which is an output signal obtained by combining the reproduced video signal and the mute signal q, is continuous. The reproduced image (p signal "b" and the mute signal q are combined by a mute switch 7, amplified by an output circuit 8, and outputted from an output terminal 9.

Effects of the Invention As described above, the present invention provides means for separating a vertical synchronizing signal from a video signal and generating a reset signal, a synchronizing signal generating means for generating a synchronizing signal by being reset by the vertical synchronizing signal, and a synchronizing signal generating means. means for generating a video signal for muting based on the synchronization signal of the video signal, means for switching between the video signal and the video signal for muting, and means for generating a reference signal for spindle motor rotation that maintains a constant phase relationship with the vertical synchronization signal. By providing this, it is possible to obtain an excellent effect of preventing image disturbance when muting is canceled after trunk movement is completed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a video floppy recording/playback device according to an embodiment of the present invention, FIG. 2 is a timing diagram for explaining FIG. 1, FIG. 3 is a block diagram of a conventional example, and FIG. 4 is the same. FIG. 3 is a timing diagram showing the operation. 10... Synchronization separation circuit, 11... Reset generation circuit, 13... Synchronization signal discrimination circuit, 1
4... Synchronization signal generation circuit, 16... Clock generation circuit, 16... Mute signal generation circuit, 17. Old... Reference signal generation circuit. Name of agent: Patent attorney Toshio Nakao and one other person Figure PG Exit (b) Motor basic information (C) On-cho Dosho No. 11 in Sushu No. 1

Claims (1)

[Claims] means for determining the presence or absence of a vertical synchronization signal in a video signal reproduced from a video floppy; means for generating a reset signal from the vertical synchronization signal; and synchronization signal generation means for generating a synchronization signal by being reset by the vertical synchronization signal; means for generating a mute video signal based on the synchronization signal from the synchronization signal generation means; means for switching and outputting the video signal and the mute video signal; and a vertical synchronization signal in a non-reset state of the synchronization signal generation means. and N times or 1/
1. A video floppy recording/reproducing apparatus comprising means for generating a reference signal for spindle motor rotation having a frequency relationship of M (N and M are both integers).