JPH0620204A - Recording apparatus of still image - Google Patents

Abstract

PURPOSE:To increase the number of recording operations by a CHSV system while the compatibility of the title apparatus with conventional systems is being kept by a method wherein a track width is set at 30mum, a track pitch is set at 50mum and a recording operation is performed by an H-arrangement. CONSTITUTION:The processing of a prescribed camera signal and the processing of a recording signal are executed by a CHSV signal processing circuit 2 with reference to a signal from an image sensing part 1. The signals are output to individual heads 4, 5 as two-channel heads; they are recorded on an SV floppy disk 3. When a video signal for one floppy disk is divided into a plurality of tracks and recorded on the SV floppy disk 3, a track width is set at 30mum, a track pitch is set at 50mum, and a recording track is set as an H-arrangement with reference to one of adjacent recording tracks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image recording apparatus for recording a still image on a magnetic recording medium.

[0002]

2. Description of the Related Art For example, there is an SV (still video) system as a system for recording an NTSC still image on a 2-inch magnetic disk (hereinafter referred to as an SV floppy). And recently, 1 in this SV floppy
CHSV (Format) is a method that is compatible with conventional SV systems while enabling recording with image quality of about 000 pixels (vertical) x 1300 pixels (horizontal).
Compatible High Definition
n SV) method has been proposed.

Here, an outline of the CHSV system will be described. The CHSV system uses a technique called sampled value analog transmission. This is a technique used also in the MUSE (Multiple Sub Nyquist Sampling Encoding) system proposed by the Japan Broadcasting Corporation (NHK) as a transmission system of HDTV (High Definition Television), and it is a predetermined technique. It is intended to correctly transmit a sample value sequence (time interval T) by using an analog transmission line with band limitation.

There are the following two conditions for realizing this sample value analog transmission. The frequency characteristic of the analog transmission line is linear phase, and
The target roll-off characteristic is centered on the frequency of (1 / 2T). On the receiving side (during playback), resample the correct sample points.

The CHSV system basically records the sample value sequence of the video signal on an SV floppy and reproduces it in accordance with the recording format of the conventional SV system, while satisfying the above conditions. That is, as shown in FIG. 8, the sampled input signal is input to a low pass filter (LP
After passing through F) 11, FM modulation is performed by the FM modulator 12, and recording is performed on the SV floppy 3 by the output of the FM modulator 12. Further, at the time of reproduction, the reproduction signal obtained by the head (not shown) is FM-demodulated by the FM demodulator 13, and the signal obtained through the low-pass filter 14 is resampled by the sampling circuit 15.
This is the output signal.

FIG. 9 shows a YS (luminance) signal (FIG. 9A) and C1, C2 (color difference) signals (FIGS. 9B and 9C) recorded on an SV floppy disk in the CHSV system. Sample points are shown. Here, as the color difference signals C1 and C2, the (RY) signal and the (BY) signal are shown, but C1 and C are used as the classification indicating how to take the sample points.
Display 2 Therefore, if C1 = (RY), then C2 = (BY), and conversely C1 = (BY).
In the case of Y), C2 = (RY). And CHS
In the V method, Y and C of the sample pattern shown in FIG.
The 1 and C2 signals are divided into 4 types and recorded on 4 tracks of the SV floppy.

The division method differs for the Y signal, the C1 signal and the C2 signal. Y signal YA signal: Y signal sampling point on (4n + 0) line YB signal: (4n + 1) 〃 〃 YC signal: (4n + 2) 〃 〃 YD signal: (4n + 3) 〃 〃 C1 signal C1A: C1 on (8n + 0) line Signal sample point C2B: (8n + 2) 〃 〃 C3C: (8n + 4) 〃 〃 C4D: (8n + 6) 〃 〃 C2 signal C2A: C2 signal sample point on the (8n + 1) line C2B: (8n + 3) 〃 C8: 〃 C〃 C〃 C〃 〃 〃 C2D: (8n + 7) 〃 〃 In the recording format of the conventional SV system, the FM-modulated Y signal and the FM-modulated C1 / C2 (color difference line sequential) signal are frequency-multiplexed and recorded (Fig. 10). reference). In the CHSV system, C1 is applied to the YA to YD signals.
The signals after FM modulation are frequency-multiplexed by the following combinations of A to C1D and C2A to C2D signals. (I) YA, C1A / C2C (II) YB, C2A / C1C (III) YC, C1B / C2D (or C2B / C
1D) (IV) YD, C2B / C1D (or C1B / C
2D) FIG. 11 shows an example of a recording pattern when recording the signals (I) to (IV) on an SV floppy disk.

Therefore, the S recorded by the CHSV method is recorded.
When playing a V-floppy with a conventional SV playback device, at least field playback is completely compatible.
When the frames of the second track and the third track are reproduced, compatibility of frame reproduction can be obtained.

During CHSV reproduction, the original sample values are completely restored by re-sampling the sample value sequence recorded on the four tracks at correct sample points.
They are stored in the memory at the time of reproduction, and thereafter, by interpolating pixels other than the sample points shown in FIG.
About 1300 still images are reproduced. The above is CHSV
It is an outline of the method.

[0010]

However, in the SV recording format according to the above-mentioned conventional technique, it is specified that a maximum of 50 tracks can be recorded on one SV floppy disk. Therefore, if the CHSV method recording is performed, only 12 still images can be recorded on one SV floppy. Under such circumstances, there has been a demand for a means for increasing the number of recording sheets in the CHSV system while maintaining a certain level of compatibility with the conventional SV system.

The object of the present invention has been made in view of the above-mentioned circumstances of the prior art, and provides a still image recording apparatus capable of increasing the number of recording sheets by the CHSV system while maintaining compatibility with the conventional art. To do.

[0012]

In order to achieve the above object, the present invention provides a still image recording apparatus for recording a video signal for one still image on a still video floppy disk by dividing it into a plurality of tracks. The recording means is 30 .mu.m and the track pitch is 50 .mu.m, and a recording means for recording the recording tracks on one of the adjacent recording tracks by H-arrangement is provided.

[0013]

According to the above-mentioned means, the track width and the track pitch are ½ of those of the conventional one, and the CHSV system recording is performed by arranging H on adjacent recording tracks. Therefore, more than double the number of still images (25) of the conventional one can be recorded, and compatibility with the conventional SV system can be achieved.

[0014]

1 is a block diagram showing an embodiment of a still image recording apparatus according to the present invention.

A CHSV signal processing circuit 2 is connected to the image pickup section 1, and heads 4 and 5 are connected to outputs of the two systems. Each of the heads 4 and 5 is an SV floppy 3
It is arranged so as to face.

In this embodiment, the CHSV signal processing circuit 2 processes a predetermined camera signal and a recording signal for a signal from the image pickup unit 1 and outputs the processed signal to each of the heads 4 and 5 of the 2-channel head. , SV floppy 3 is recorded. In this case, the recording operation is divided into the first step and the second step.

FIG. 2 is an explanatory diagram showing a CHSV recording pattern in the present invention. A still image is recorded using 4 tracks. Here, the track width is 30μ.
m, the guard band width between tracks is set to 20 μm. Therefore, the track pitch in this case is 50μ.
m. That is, the track pitch of the present invention is half that of the conventional recording pattern.

As a result, one SV floppy can record 100 times as many tracks as the conventional one, and 25 still images can be recorded even if recording is performed by the CHSV system. However, in the present invention, as shown in FIG.
The signals to be recorded on the four tracks are reversed with respect to the conventional CHSV recording pattern. However, strictly speaking, only the Y _C and Y _D signals of the third and fourth tracks need to be interchanged, but the color difference signals may be interchanged or may not be interchanged, so FIG. 2 is shown as an example.

In order to perform such recording, the head 4,
2 channel head 6 consisting of 5 has a gap width of 30 μ
m, and the track pitch is 50 μm, the head pitch is 50 μm. This two-channel head is located at the position A in FIG. 3 in the above-mentioned first step, and recording on the first and second tracks is performed in H-line and simultaneously performed. After that, the head is moved at high speed to the position B in FIG. However, during this head movement, the image pickup unit 1
The signal reading from is temporarily stopped. Then, in the second step as well, the recording of the third and fourth tracks is performed at the same time as the first step.

The CHSV according to the present invention shown in FIG.
4 and 5 show how the recording pattern is reproduced by the conventional SV 2-channel head. In FIG. 4, the first and third tracks can be reproduced by the conventional SV 2-channel head 7, and in the state of FIG. 5, the second and third tracks can be reproduced as one NTSC frame. Further, it goes without saying that field reproduction is also possible with the conventional SV head 7.

FIG. 6 is a block diagram showing another embodiment of the present invention. This embodiment uses a 4-channel head,
The 4-channel head 8 includes a head (I) 8a, a head (II) 8b, a head (III) 8c, and a head (IV).
It consists of 8d. On the other hand, since the CHSV signal processing circuit 2 outputs two channels, the switch 9 (SW1) and the switch 10 which are interlocked with the four-channel head 8 are connected.
(SW2) is provided and these are switched according to the step.

In FIG. 6, the 4-channel head used has a gap width of 30 μm and a pitch of 50 μm. In this case as well, the recording operation is performed in two steps. That is, in the first step, the switches 9 and 10 are switched to the positions indicated by the dotted lines, and the head (I) 8a and the head (II) 8b of the four-channel head are used to move the first and second switches.
Recording is simultaneously performed on the tracks, and in the second step, the switches 9 and 10 are switched to the solid line position to change the head (II
Recording on the third and fourth tracks is simultaneously performed by I) 8c and head (IV) 8d. In this case, since the 4-channel head is used, it is not necessary to move the head as in the embodiment of FIG. FIG. 7 is an explanatory diagram showing the method of forming the recording pattern in this embodiment.

[0023]

As described above, according to the present invention, in a still image recording apparatus for recording a video signal for one still video floppy disk into a plurality of tracks, the track width is 30 μm and the track pitch is 50 μm. ,
Moreover, since the recording means for recording the recording tracks in one of the adjacent recording tracks by H-arrangement is provided, more than twice the number of still images as in the conventional case can be recorded, and the compatibility with the conventional SV system is achieved. To be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a still image recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a CHSV recording pattern in the present invention.

FIG. 3 is an explanatory diagram showing a method of forming a recording pattern according to the embodiment of FIG.

FIG. 4 is an explanatory diagram showing a reproducing method using a conventional SV 2-channel head.

FIG. 5 is an explanatory diagram showing a reproducing method when the head is moved in reproducing by a conventional SV 2-channel head.

FIG. 6 is a configuration diagram showing another embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a method of forming a recording pattern in the embodiment of FIG.

FIG. 8 is an explanatory diagram showing the concept of analog transmission of sample values of a video signal according to the CHSV method.

FIG. 9 is an explanatory diagram showing sample patterns of Y signals, C1 and C2 signals.

FIG. 10 is a conceptual diagram showing frequency allocation in a still video (SV) format.

FIG. 11 is an explanatory diagram showing a method of forming a CHSV recording pattern.

[Explanation of symbols]

 1 Imaging unit 2 CHSV signal processing circuit 3 SV floppy 4,5 head 6,7 2 channel head 8 4 channel head 9,10 switch

Claims (1)

[Claims] 1. A still image recording apparatus for recording a video signal for one still image on a still video floppy disk into a plurality of tracks, wherein the track width is 30 μm, the track pitch is 50 μm, and the recording tracks are adjacent to each other. A still image recording apparatus, characterized in that a recording means for recording in H side by side on one side is provided.