JPH0622271A - Electronic still video recorder - Google Patents

Abstract

PURPOSE:To attain sure frame recording/reproduction to/from a magnetic disk without need of using, e.g. a 2-head integral magnetic head in the electronic still video recorder using the magnetic disk to record/reproduce a still picture video signal. CONSTITUTION:In the case of recording of a still picture data frame onto a magnetic disk, a picture signal by one frame is stored in the lump to a luminance signal storage section 11 and a color difference signal storage section 12 and the picture signal is read one by one field from the storage sections 11, 12 and sent to a magnetic disk device 15 and in the case of still picture data reproduction subject to frame recording onto the magnetic disk, the picture signal read one by one field each from the magnetic disk device 15 is stored in the lump in the storage sections 11, 12 and outputted sequentially via an encoder 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic still video recorder for recording / reproducing still picture video signals using a magnetic disk.

[0002]

2. Description of the Related Art Generally, in an electronic still camera using a magnetic disk as a recording medium for still image data, one track of the magnetic disk is used when performing field recording, so that frame recording is performed with two fields as one frame. In this case, recording processing is performed over two tracks, one field per track of the magnetic disk.

In this case, in order to move the magnetic head between the adjacent tracks of the magnetic disk to perform frame recording for each track and one field, there is a time lag due to the movement of the magnetic head between the fields, so that one field is actually used. Frame processing on a magnetic disk is difficult with a magnetic head.

Therefore, in order to perform frame recording / reproduction on a magnetic disk, two cores of a magnetic head are actually arranged side by side at a track pitch of the magnetic disk.
A head-integrated magnetic head is used.

[0005]

However, such a special magnetic head has a problem that it is difficult to process because it requires extremely high dimensional accuracy, so that the yield is low and therefore it is expensive. The present invention has been made in view of the above problems, and for example, an electronic still video recorder capable of surely performing frame recording / reproducing on a magnetic disk without using a two-head integrated magnetic head. The purpose is to provide.

[0006]

That is, an electronic still video recorder according to the present invention records an image signal of one frame by using two tracks of a magnetic disk.
A frame signal memory holding means for storing and holding an image signal for a frame at a time point, an image signal recording means for reading an image signal from the frame signal memory holding means and recording it on the magnetic disk, and a signal read from the magnetic disk. An image signal writing means for writing an image signal into the frame signal storage / holding means and a frame signal output means for reading out and outputting the image signal from the frame signal storage / holding means are configured.

[0007]

That is, when recording a still image data frame on a magnetic disk, an image signal for one frame is temporarily stored and held in the frame signal storing and holding means, and the image signal for each field is sent from the storing and holding means. Is read and recorded on the magnetic disk. When reproducing still image data frame-recorded on the magnetic disk, the image signals read from the magnetic disk one field at a time are collectively stored and held in the frame signal storage / holding means, and sequentially read and output. Therefore, the track-to-track movement processing of the magnetic head on the magnetic disk does not adversely affect the recording / playback processing of the still image data.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an electronic circuit of an electronic still video recorder. In FIG. 1, reference numeral 10 denotes a control unit, which controls the address control units 13 and 14 of the luminance signal storage unit 11 and the color difference signal storage unit 12, respectively.
Address control signal to the magnetic disk device 15 and a control signal to the magnetic disk device 15.
Recording / re-control signals are supplied to the recording / re-selection switch circuits 16 and 17 provided in the two input / output sections, respectively.

This electronic still video recorder has an NT
An SC (National Television System Commitee) video signal input terminal Video IN is provided, and a video signal frame-input from the video signal input terminal Video IN is supplied to the decoder 18.

The decoder 18 separates an NTSC video signal into a luminance signal (Y) and a color difference signal (RY) (BY), and each video separation signal separated and output by the decoder 18. (Y) (R-Y) (B-Y) is
During recording control by the control unit 10, the data is supplied to the corresponding A / D converters 19 and 20 via the recording / re-selection switch circuit 16.

The luminance signal (Y) converted into a digital signal by the A / D converter 19 is frame-stored in the luminance signal storage section 11. In addition, the A / D converter 2
Color difference signal (R-
Y) (B-Y) is frame-stored in the color difference signal storage unit 12.

Here, the A / D converters 19 and 20
The A / D conversion control for the signal and the address control for the luminance signal storage unit 11 and the color difference signal storage unit 12 are performed in synchronization with the timing signals generated by the timing signal generation unit 21, respectively.

The image luminance signal (Y) and the image color difference signals (RY) (BY) for one frame stored in the luminance signal storage section 11 and the color difference signal storage section 12 respectively correspond to D. It is supplied to the / A converters 22 and 23.

The D / A converters 22 and 23 are synchronized with the timing signals generated by the timing signal voicing section 21, respectively, and the luminance signal (Y) and the color difference signals read from the luminance signal storage section 11 are read. Storage unit 12
The color-difference signals (RY) (BY) read from each of the color difference signals are converted into analog signals, and the image signals converted into analog signals via the D / A converters 22 and 23 are controlled by the control unit. In the recording control by 10, the signal is supplied to the FM modulation circuit 24 via the recording / re-selection switch circuit 16.

The FM modulation circuit 24 outputs the image signals (Y) (RY) (BY) inputted through the recording / re-selection switch circuit 16 during the recording control, respectively.
The image signal which is M-modulated and superposed is supplied to the magnetic disk device 15 through the head amplifier 25, and the image signal which is modulated and superposed through the FM modulation circuit 24 is supplied to each track of the magnetic disk in one field in two tracks. It is recorded as one frame.

In this case, when the magnetic head moves between tracks after recording one field in the magnetic disk device 15, the read operation of each image signal from the luminance signal storage section 11 and the color difference signal storage section 12 is temporarily stopped. It does not hinder the frame recording over two tracks, one field per track.

On the other hand, the image signal read from the magnetic disk by the magnetic disk device 15 is applied to the demodulation circuit 26 through the head amplifier 25. This demodulation circuit 26
Is for demodulating an image signal read from the magnetic disk and separating it into a luminance signal (Y) and a color difference signal (RY) (BY), and each demodulated image signal from this demodulation circuit 26. (Y), (RY), and (BY) are the control unit 1 respectively.
Recording / re-selection switch circuit 1 during playback control by 0
6 through the corresponding A / D converters 19, 2 respectively
Supplied to zero.

The luminance signal (Y) converted into a digital signal by the A / D converter 19 is stored in the luminance signal storage section 11 and the color difference signal (R−) converted into a digital signal by the A / D converter 20. Y) (B-Y)
Are stored in the color difference signal storage unit 12 as frames.

During the reproduction control, the image signals read out from the luminance signal storage section 11 and the color difference signal storage section 12 correspond to the corresponding D / A converters 22 and 23 in the same manner as during the recording control. Is converted into an analog signal via the recording / re-selection switch circuit 17 and sent to the encoder 27.

The encoder 27 receives the demodulated image signals (Y) (R-) supplied from the recording / re-selection switch circuit 17.
Y) (BY) is converted into an NTSC video signal, and the NTSC video signal from this encoder 27 is output from the video signal output terminal Video OUT, and is input to, for example, the video playback terminal of the monitor television. .

That is, in the electronic still video recorder having the above-described structure, in order to record still image data picked up by, for example, an electronic still camera in two fields and one frame on a magnetic disk, the image data output terminal of the electronic still camera is used as this. Connect to the video signal input terminal Video IN of the electronic still video recorder.

When the subject is captured by the viewfinder of the electronic still camera and the release switch is operated, the still image pickup signal is given to the decoder 18 as a video signal, and the luminance signal (Y) and the color difference signal (RY) ( BY)
And demodulated separately.

After being converted into digital luminance signals (Y) and color difference signals (RY) (BY) by the A / D converters 19 and 20 via the recording / re-selection switch circuit 16, In synchronization with the timing signal from the timing signal generation unit 21, one frame is sequentially stored in the corresponding luminance signal storage unit 11 and color difference signal storage unit 12.

In this way, the image signals once frame-stored in the luminance signal storage unit 11 and the color difference signal storage unit 12 are first field D / A converters 22 and 23.
Is read out through the recording / re-selection switch circuit 17 to F
After being sequentially modulated and superposed via the M modulation circuit 24, they are sent to the magnetic disk device 15 through the head amplifier 25.
As a result, the first field of the still image data is recorded on one track of the magnetic disk.

When the magnetic head of the magnetic disk device 15 is set to move to the adjacent track of the magnetic disk, the image for the remaining one field stored and held in the luminance signal storage section 11 and the color difference signal storage section 12 is set. The signal is read through the D / A converters 22 and 23 as in the above, and is sent from the recording / re-selection switch circuit 17 to the magnetic disk device 15 through the FM modulation circuit 24 and the head amplifier 25. As a result, the second field of the still image data is recorded on one track adjacent to the recording track of the first field, and the still image data is frame-recorded in the two track area of the magnetic disk.

On the other hand, in order to reproduce the still image data frame-recorded on the magnetic disk, the recording / re-selection switch circuits 16 and 17 are switched to the reproducing side by the control unit 10.

Then, one frame of still image data read from the magnetic disk by the magnetic disk device 15 is sequentially given from the head amplifier 25 to the demodulation circuit 26, and the luminance signal (Y) and the color difference signal (RY) are supplied. After being separated and demodulated into (BY), they are once stored in the luminance signal storage section 11 and the color difference signal storage section 12 via the recording / re-selection switch circuit 16 and the A / D converters 19 and 20, respectively. .

In this case, the image signal read by the magnetic disk device 15 is read one field at a time when the magnetic head moves between tracks, and is stored and held for one frame.

The image signals stored and held in the luminance signal storage section 11 and the color difference signal storage section 12 are sequentially read out via the D / A converters 22 and 23, and the recording / re-selection switch circuit 17 outputs the encoder 27 to the encoder 27. It is converted to an NTSC video signal and output.

Thereafter, the image signals for one frame are repeatedly read from the luminance signal storage section 11 and the color difference signal storage section 12, respectively, and sent from the video signal output terminal Video OUT to a monitor television or the like for reproduction and output.

Therefore, according to the electronic still video recorder having the above configuration, when recording a still image data frame on the magnetic disk, the image signal for one frame is once stored in the luminance signal storage section 11 and the color difference signal storage section 12. On the other hand, they are collectively stored and held, and the image signals are read from the storage units 11 and 12 one field at a time and sent to the magnetic disk device 15, and also when the still image data frame-recorded on the magnetic disk is reproduced. The image signals read from the one field by 15 are stored in the storage units 11 and 12 described above.
Since it is collectively stored and stored in and output from the decoder 27 sequentially, the track-to-track movement processing of the magnetic head in the magnetic disk device 15 does not adversely affect the recording / playback processing of still image data.

As a result, even when performing frame recording of still image data, it is possible to realize an inexpensive video recorder that can reliably perform recording / reprocessing without the need of using a two-head magnetic head.

[0033]

As described above, according to the present invention, an image signal for one frame is recorded by using two tracks of a magnetic disk, and a frame signal storage for storing and holding the image signal for one frame at a temporary point. Holding means, image signal recording means for reading an image signal from the frame signal memory holding means and recording it on the magnetic disk, and image signal writing for writing the image signal read from the magnetic disk to the frame signal memory holding means. And a frame signal output unit for reading and outputting the image signal from the frame signal storage / holding unit. Therefore, for example, it is not necessary to use a two-head integrated magnetic head, and the frame recording / recording is surely performed on the magnetic disk. An electronic still video recorder capable of reproducing can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic still video recorder according to an embodiment of the present invention.

[Explanation of symbols]

10 ... Control unit, 11 ... Luminance signal storage unit, 12 ... Color difference signal storage unit, 13, 14 ... Address control unit, 15 ... Magnetic disk device, 16, 17 ... Recording / reselection switch circuit, 18
Decoder, 19, 20 ... A / D converter, 21 ... Timing signal generator, 22, 23 ... D / A converter,
24 ... FM modulation circuit, 25 ... Head amplifier, 26 ... Demodulation circuit, 27 ... Encoder.

Claims (1)

[Claims] 1. An electronic still video recorder for recording an image signal of one frame by using two tracks of a magnetic disk, and a frame signal memory holding means for storing and holding an image signal of one frame at a time point, and the frame signal. Image signal recording means for reading an image signal from the memory holding means and recording it on the magnetic disk, image signal writing means for writing the image signal read from the magnetic disk to the frame signal memory holding means, and the frame signal memory An electronic still video recorder comprising: a frame signal output means for reading and outputting an image signal from a holding means.