JPS6374286A - Recording and reproducing device for still picture - Google Patents

Abstract

PURPOSE:To observe a still picture inputted for recording while using a TV monitor of the NTSC system by supplying Y+S (luminance signal and synchronizing signal) and two color difference signals formed from R, G, B primary color signals and a composite synchronizing signal inputted to a recording system into a reproducing system so as to obtain an NTSC video signal. CONSTITUTION:In giving the R, G, B primary color signals and a C-sync composite synchronizing signal to a Y+S and color difference signal generating circuit 1, the Y+S signal and color difference signals R-Y,B-Y are outputted. After they are FM-modulated by FM modulation circuits 2, 6, the result is added and synthesized by a synthesizer 3, written on a floppy disk by thin film double heads 8a, 8b to record a still picture. Moreover, switching circuits 17, 18, 20 are set to the reproducing signal input side, the recorded signal is read by the thin film double heads 8a, 8b from the floppy disk and the signal is fed to a synthesizing section 21. The synthesizing section 21 adds and synthesizes the Y+S signal and a signal from an encoder 19 to generate an NTSC video signal, which is fed to the NTSC system TV monitor connected externally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still image recording and reproducing apparatus that records still images on a magnetic recording medium such as a floppy disk, reproduces the still images, and outputs the reproduced still images as an NTSC video signal.

[Prior Art] Conventionally, this type of still image recording and reproducing apparatus reproduces still images recorded on a magnetic recording medium, outputs them as an NTSC video signal, and displays the signals on an NTSC TV monitor. It has been known.

[Problems to be Solved by the Invention] However, in such conventional devices, due to the difference in bands, an NTSC TV monitor is used to view reproduced images using R, G, and B primary color signals input to the recording system. I couldn't see the image.

This invention generates an NTSC video signal by supplying a (luminance signal/No. 10 synchronization signal) and two color difference signals, which are generated from R, G, and B primary color signals input to a recording system and a composite synchronization signal, to a reproduction system. The object of the present invention is to provide a still image recording and reproducing apparatus that allows viewing of still images input for recording using an NTSC TV monitor.

[Means for Solving the Problems] This invention inputs R, G, B primary color signals and a composite synchronization signal to create two color difference signals (luminance signal plus synchronization signal) and (luminance signal plus synchronization signal). ) is FM-modulated and each color difference signal is FM-modulated with a line-sequential signal to magnetically record a still image signal on a magnetic recording medium. The luminance signal (plus synchronization signal) and color difference signal are separated and FM demodulated, and the color difference signal is further subjected to line-sequential processing, separated into two color difference signals, modulated by an NTSC encoder, and further processed by a combining section. In a still image recording and reproducing device, which consists of a reproduction system that combines a luminance signal and a synchronization signal to obtain a still image video signal, the recording system inputs R, G, and B primary color signals and a composite synchronization signal. An input circuit that inputs the generated (luminance signal and synchronization signal) to the synthesis section of the reproduction system, and an input circuit that inputs the R, G,
An input circuit that manually inputs each color difference signal created by manually inputting the B primary color signal and a composite synchronization signal to the NTSC encoder of the reproduction system, and (luminance signal synchronization signal) and each color difference signal from each input circuit and the reproduction system. Made with (luminance signal + sync signal)
and a plurality of switching circuits for selectively inputting each color difference signal to the combining section and the NTSC encoder.

[Function] In the present invention having such a configuration, R in the recording system is
, G, and B primary color signals and a composite synchronization signal are input, two color difference signals (luminance signal and synchronization signal) are generated, which are FM-modulated and magnetically recorded on a magnetic recording medium. At this time, if the switching circuits are selectively switched so that the (luminance signal and synchronization signal) and two color difference signals are input from the recording system through each input circuit to the synthesis section and NTSC encoder of the reproduction system, respectively, the synthesis can be performed. The NTSC video signal is obtained by combining the (luminance signal and synchronization signal) from the recording system and the color difference signal from the recording system, which has been subjected to carrier suppression amplitude modulation by the NTSC encoder, and can be viewed on an NTSC TV monitor. It becomes possible.

[Example] Embodiments of the invention will be described below with reference to the drawings.

In recording system A, the primary color signals of R (red), G (green), and B (blue) input from the outside and the composite synchronization signal of C-5ync are input as Y+S (luminance signal plus synchronization signal), R-Y, B-
The Y color difference signal is input to the output path 1. The Y+S and (Y+S) signals from the color difference signal generation circuit 1 are FM modulated by a 7 MHz carrier in an FM modulation circuit 2 and supplied to a synthesizer 3.

Further, the Y+S and (R-Y
) signal and (B-Y) signal are respectively supplied to the switching circuit 4.

The composite synchronization signal C-5ync is also supplied to a synchronization separation circuit 5 for line sequential processing. This synchronization separation circuit 5 generates a switching signal for line sequential processing, and contacts 4 of the switching circuit 4.
a is switched every horizontal scan, and the Y+S and (RY) signals and CB-Y) signals from the color difference signal generation circuit 1 are alternately supplied to the FM modulation circuit 6 for FM modulation and the synthesizer 3
is being entered. In this case (RY) signal is 1.2MH
FM modulation with carrier z, and ('B-Y) signal is 1
．． It is FM modulated with a 3MHz carrier.

The synthesizer 3 adds and synthesizes the modulated signals inputted from the respective FM modulation circuits 2 and 6, and supplies the resultant signal to the recording gate circuit 7. This recording gate circuit 7 controls the recording timing of the recording signal and causes a recording current to flow through the thin film double heads 8a and 8b to record the still image signal on a magnetic recording medium, such as a floppy disk. For example, this recording is done once per track.
One frame is recorded as a field using two tracks.

B in the figure shows a reproduction system, in which a still image signal recorded on a floppy disk is read by the thin-film double radars 8a and 8b, and each read signal is taken in alternately via a switching circuit 9 and a bypass filter 10 and The signal is supplied to both low-pass filters 11. The signal obtained through the bypass filter 10 is FM demodulated by an FM demodulation circuit 2 to obtain a (Y+S) signal. Further, the signal obtained through the low-pass filter 15 is FM demodulated by the FM demodulation circuit 13, and then is alternately switched between delayed and non-delayed signals by the IH (1 horizontal scan) delay circuit 14. By overlapping (R-
Y) By creating a signal and alternately switching delayed and undelayed signals using the switching circuit 16 and overlapping them (B
-Y) signal, and each signal is switched to the switching circuit 17.
18 to an NTSC encoder 19.

The (y+S) signal obtained by the FM modulation circuit 12 is supplied to a combining section 21 via a switching circuit 20.

One of the NTSC encoders is (RY), (B-Y)
When each signal is input, the color difference signals (R-Y) and (B-Y) are subjected to carrier wave suppression amplitude modulation and then supplied to the combining section 21.

The synthesizing section 21 synthesizes the (Y+S) signal and the amplitude-modulated color difference signal and outputs it as an NTSC video signal.
The signal is supplied to a TSC type TV monitor (not shown).

The (Y+S) signal from the FM demodulation circuit 12 is taken into the sync separation circuit 22 to separate the sync signal, and the switching signal generation circuit 23 is driven by the signal.

This switching signal generating circuit 23 is connected to the switching circuit 9゜15.1.
6 is switched and controlled every horizontal scan.

Further, the Y+S signal from the recording system A and the (Y+S) signal from the color difference signal generation circuit 1 are transferred to the reproduction system B via the switching circuit 20.
An input circuit 24 for inputting the input circuit to the combining section 21 of the NTSC encoder 19 is formed, and an input circuit 25 for inputting the (RY) signal to the NTSC encoder 19 via the switching circuit 17, The NT via circuit 18
An input circuit 26 for inputting to one SC encoder is formed.

In this embodiment having such a configuration, the Y+S and color difference signal generation circuit 1 receives R, G, and B primary color signals and C-3yn.
When the composite synchronization signal c is input, the Y+S (luminance signal plus synchronization signal) signal and the R-Y and B-Y color difference signals are output, and after they are FM modulated by the FM modulation circuit 2.6. The synthesizer 3 performs addition and synthesis, and writing is performed on the floppy disk from the thin film double heads 8a and 8b via the recording gate circuit 7, thereby recording a still image.

In addition, the switching circuits 17, 18, and 20 are set at the playback signal input terminals to transfer the floppy disk to the thin film double head 8a.
The recording signal is read at 8b, the (Y+S) signal is taken out via the bus filter 10 and the FM demodulation circuit 12, and is supplied to the synthesis section 21 via the switching circuit 20. The (R-Y) signal and (B-Y) signal are processed line-sequentially through the low-pass filter 11 and the FM demodulation circuit 13, and then by the IH delay circuit 14 and the switching signal generation circuit 23 under the switching control of the switching circuit 15.16. The signals are taken out and sent to the NTSC encoder 1 via switching circuits 17 and 18, respectively.
9. The signal is subjected to carrier suppression amplitude modulation by the NTSC encoder 19 and then supplied to the combining section 21 .

In this way, in the synthesis section 21, the (Y+S) signal and the encoder 1
The signal from 9 is added and synthesized to create an NTSC video signal and supplied to an externally connected NTSC TV monitor. The still image recorded on the floppy disk will then be displayed on the TV monitor.

In this device, when recording a still image on a floppy disk, if the switching circuits 20, 17.18 are switched to the input circuits 24, 25.26, respectively, Y+S and color difference signal generation circuit 1 output (Y+S). The (RY) signal is supplied to the NTSC encoder 19 via the input circuit 24 and the switching circuit 20, and the (B-Y) signal is supplied to the NTSC encoder 19 via the input circuit 25 and the switching circuit 17. ) signal is supplied to the NTSC encoder 19 via the input circuit 26 and the switching circuit 18. and N
The signal is subjected to carrier suppression amplitude modulation by the TSC encoder 19 and then supplied to the combining section 21 .

In this way, the NTSC video signal is outputted from the synthesizing section 21 and displayed on the TV monitor in the same manner as during playback. Even when recording a wideband (10MHz) signal, such as when recording a still image by inputting R, G, and B primary color signals, you can observe the recorded still image using an NTSC TV monitor. can.

[Effects of the Invention] As detailed above, according to the present invention, two color difference signals (luminance signal and synchronization signal) and two color difference signals are generated from the R, G, and B primary color signals and the composite synchronization signal input to the recording system. is supplied to the playback system to obtain an NTSC video signal.
Accordingly, it is possible to provide a still image recording and reproducing apparatus that allows viewing of still images input for recording using a TV monitor of the present invention.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the invention. 1...Y+S and color difference signal generation circuit, 2, 6...F
M modulation circuit, 3a, 8b...thin film double head, 12
．． 13...FM demodulation circuit, 17,18.20...Switching circuit, 24,25.26...Input circuit.

Claims (1)

[Claims] Input R, G, B primary color signals and composite synchronization signal to create (luminance signal + synchronization signal) and two color difference signals, perform FM modulation on (luminance signal + synchronization signal) and convert each color difference signal into line sequential signal. a recording system that magnetically records a still image signal on a magnetic recording medium through FM modulation; and a recording system that reads out the still image signal recorded on the magnetic recording medium and separates (luminance signal + synchronization signal) and color difference signal from the signal. The color difference signals are further subjected to line-sequential processing, separated into two color difference signals, modulated by an NTSC encoder, and then combined with the above (luminance signal + synchronization signal) in a synthesis section to produce a still image. In a still image recording and reproducing apparatus, a still image recording and reproducing apparatus comprises a reproducing system that obtains a video signal, and a reproducing system that inputs R, G, B primary color signals and a composite synchronizing signal (luminance signal + synchronizing signal) produced by the recording system. An input circuit for inputting the input to the synthesis section and an R in the recording system.
, G, B primary color signals and composite synchronization signals are input to the NTSC encoder of the reproduction system, and (luminance signal + synchronization signal) and each color difference signal from each input circuit Created by signal and reproduction system (luminance signal +
synchronization signal) and each color difference signal to the synthesis unit and the NTS.
1. A still image recording and reproducing device characterized in that a plurality of switching circuits are provided for selectively inputting input to a C encoder.