JPH04167693A - Recording and reproducing device for video signal - Google Patents

Abstract

PURPOSE:To keep the same picture quality as normal pictures even at the time of reproducing a still picture by processing a color signal in the same manner as a luminance signal to record and reproduce the picture. CONSTITUTION:When the still mode is designated by a still control signal S, a field memory 4 takes in color component signals R, G, and B, and input is not accepted hereafter until the still mode is released, and the field memory 4 successively repeatedly outputs taken-in data while the still mode is set. A switcher 11 successively repeatedly and selectively outputs inputted color component signals R, G, and B with one field as the unit, and they are outputted from an output terminal as a face component signal RGB where respective components are repeated with one field as the unit. This face component signal RGB passes a matrix circuit 12 as it is and is inputted to an encoder circuit 5 and is processed as a luminance signal Y and is supplied to a VTR system. Thus, the still picture having the same picture quality as normal reproduced pictures is obtained.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a video signal recording and reproducing device that records a still screen video signal on a recording medium such as a magnetic tape and plays back the recorded video signal. Regarding.

(b) Prior Art In recent years, as the prices of memories, A/D converters, and D/A converters have become lower, there has been a tendency for digital signal processing to be adopted in consumer equipment. One of the additional functions provided by such digitization of signal processing is the function of recording and reproducing still images in a camera-integrated VTR.

FIG. 3 shows the configuration of such still screen recording and playback functions.

The erroneous output video signal from the CCD solid-state image sensor (1) is
A signal processing circuit (2) converts the signal into a digital component signal consisting of a luminance signal Y and color difference signals RY and BY. In normal mode, these signals pass directly through the next field memory (4) and are input to the digital color encoder circuit (5). In this digital color encoder circuit (5), the digital component signal is converted into a luminance signal Y and a color signal C of analog values, and the luminance signal Y and color signal C are supplied to a VTR system circuit.

In the VTR system, the color signal C is input to the low frequency conversion circuit (7), the luminance signal Y is input to the FM modulation circuit (6), and the outputs of the respective circuits (6) and (7) are input to the adder circuit (8). After being synthesized, the signals are recorded on a recording medium by a recording means (9) such as a magnetic head.

In such a configuration, when recording a still screen, the field memory (4) is set to read-only mode according to the still control signal S input to the memory control circuit (3), and from then on, it operates in the same way as the normal mode. Then, the video signal of the still screen on the recording medium is recorded.

(C) Problems to be Solved by the Invention However, the video signal of the playback screen, which has undergone exactly the same signal processing as the video signal of a continuous normal screen, must undergo color signal processing in the recording and playback systems during playback, such as low-frequency conversion. The deterioration of the color signal C due to noise suppression and the like becomes noticeable, and the image quality of the reproduced screen visually deteriorates.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable high-quality still screen recording and playback.

(2) Means for solving the problems The present invention has been made to solve the above problems,
The first feature is that in a video signal recording and reproducing device that records a video signal containing multiple color components on a recording medium and reads out the recorded video signal to obtain a playback screen, it separates each color component. a field memory for recording the first video signal field by field, and a second field memory in which the first video signal read out from the field memory is repeatedly selected and output field by field, and each color component is repeatedly arranged field by field. a switching circuit for obtaining a video signal; a signal processing circuit for modulating a second video signal obtained from the switching circuit into a predetermined frequency band; and a recording means for recording the modulated second video signal on a recording medium. and a video signal constituting a still screen is recorded on the recording medium over a plurality of fields.

The second feature is a reading means for reading the video signal from the recording medium and obtaining the second video signal in which each color component is repeatedly arranged in field units, and a switching circuit that distributes the second video signal in units of fields and separates each color component to obtain a third video signal; and a field memory that records the third video signal separated for each color component in each field. The third video signal is repeatedly read out from the field memory over a plurality of fields, and a reproduction signal for reproducing a still screen is synthesized based on the third video signal.

(E) Effect According to the present invention, since the color signal is processed in the same way as the luminance signal for recording and reproduction, there is no signal deterioration caused by the color signal processing system, and even when reproducing a still screen, it is possible to It is possible to maintain the same image quality as the screen of

Kube) Example Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a video signal recording and reproducing apparatus according to the present invention.

First, the operation in normal mode will be explained. CCD (
The video signal output from 1) is converted by the signal processing circuit (2) into color component signals R, G, and B of digital values including high-frequency components, and these color component signals R, G, and B are sent to the switch ~ (10) is input. In the normal mode, the switcher (10) has input terminals ■,
The signals input from ■, ■ are output to terminals ■, ■,
Output from ■. The output of the switcher (10) passes through the field memory (4) to the next switcher (11).
is input. In the normal mode, the switcher (11) outputs the signals input from the input terminals 1, 2, and 2 from the output terminals 0.0.0, respectively, as shown in FIG. 2(b). These switchers (10) and (11) are controlled according to the output of the memory control circuit (3), and are constructed by a combination of a plurality of gate circuits.

The color component signals R9G and B outputted from the switcher (11) are input to the matrix circuit (12), where they are combined into a luminance signal Y and color difference signals R-Y and B-Y and output. The encoder circuit (5) converts the luminance signal Y and color difference signals R-Y and B-Y into luminance signals Y and B-Y as shown in FIG. 2(c). The luminance signal Y and the color signal C are combined by an adder circuit (8) and then recorded on a recording medium by a recording means (9). Such an operation is basically as follows. This is exactly the same as the normal operation of the circuit shown in FIG.

Next, the operation in the still screen recording mode will be explained. The signal processing circuit (2) operates in the same manner as in the normal mode and generates digital color component signals R, G, and B including high-frequency components.
Output. In addition, the switcher (10) outputs color component signals R, G, and B to output terminals ■, ■, as in the normal mode.
■Output from. Here, when the still mode is specified by the still control signal S, the field memory (4) takes in the color component signals R, G, and B, and does not receive any further input until this still mode is canceled. configured. During this mode, the field memory (4) sequentially and repeatedly outputs the captured data.

In the switch-v (11), as shown in FIG. 2(b), the color component signals R2G and B inputted to the input terminals ■, ■, ■ are selectively output repeatedly in field units.
Solid component signal RGB that repeats each component for each field
It is output from output terminal O as This solid component signal RGB
is a matrix circuit (12
) and is input to the encoder circuit (5). Then, in the encoder circuit (5), the solid component signal RG
B is processed as a Y signal and supplied to the VTR system.

Furthermore, in the VTR system, the solid component signals RGB are input to the FM modulation circuit (6) in the same way as the Y signal without color signals, and the FM modulated output is recorded on a magnetic tape etc. by the recording means (9). recorded on the medium.

Next, the operation when reproducing the solid component signals RGB recorded on the recording medium will be explained. The signal read from the recording medium is demodulated into a solid component signal by a demodulation circuit (13) and input to the input terminal (2) of the switcher (10). As shown in FIG. 2(a), the switch ~ (10) distributes the solid component signal RGB from the input terminal ■ to the output terminals ■, ■, ■ for each field, and separates each component and stores it in the field memory. Enter in (4). This field memory (4
) repeatedly outputs each color component signal R, G, and B, and supplies them to a matrix circuit (12) via a switcher (11).

The subsequent processing is the same as in the normal mode, and necessary signals are extracted in the signal processing process to form a reproduced signal.

(G) Effects of the Invention According to the present invention, in a camera-integrated VTR having a still screen recording mode, all video signal components can be recorded and played back as luminance signals without impairing the characteristics of the still screen. This allows you to obtain a still screen with the same image quality as a normal playback screen.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the video signal recording and reproducing apparatus of the present invention, FIG. 2 is a diagram showing the configuration of each part in FIG. 1, and (a) is a configuration diagram of a switcher provided at the input stage of the field memory. , (b) is a block diagram of a switcher provided at the output stage of the field memory, (C) is a block diagram of a matrix circuit for luminance and color difference signals, and FIG. 3 is a block diagram of a conventional video signal recording/reproducing device. It is a diagram. (1)...CCD, (2)...signal processing circuit,
(3>...Memory control circuit, (4)...Field memory, (5)...Yuncoder circuit, (6)...
)...FM modulation circuit, (7)...low frequency conversion circuit,
(8)...addition circuit, (9)...recording means, (
10) (11)...Switcher, 12)...Matrix circuit, (13)...Demodulation circuit. Figure 2 (al (bl energizing is also 1" (4 dome) CC)

Claims (2)

[Claims] (1) In a video signal recording and reproducing device that records a video signal including multiple color components on a recording medium and reads out the recorded video signal to obtain a playback screen, a first video separated for each color component is used. A field memory for recording signals in field units, and switching for repeatedly selecting and outputting the first video signal read out from the field memory field by field to obtain a second video signal in which each color component is repeatedly arranged in field units. a signal processing circuit that modulates a second video signal obtained from the switching circuit into a predetermined frequency band; and recording means that records the modulated second video signal on a recording medium, 1. A video signal recording and reproducing device characterized in that a video signal constituting a screen is recorded on the recording medium over a plurality of fields. (2) The video signal recording and reproducing apparatus according to claim 1, further comprising: reading means for reading the video signal from the recording medium to obtain the second video signal in which each color component is repeatedly arranged in field units; a switching circuit that distributes the second video signal obtained from the reading means field by field and separates each color component to obtain a third video signal; a field memory for recording in field units, the third video signal is repeatedly read out from the field memory over a plurality of fields, and based on the third video signal, a playback signal for playing a still screen is synthesized. A video signal recording and reproducing device characterized by: