JPS6374287A - Recording and reproducing device for still picture - Google Patents

Abstract

PURPOSE:To display a still picture different from a 1st and 2nd display devices by providing the 1st display device displaying a reproduced 1-frame still picture signal, a frame memory storing said still picture signal and the 2nd display device reading and displaying still picture signal stored in said memory. CONSTITUTION:In receiving signals Y+S, R-Y and B-Y, an NTSC demodulation circuit 20 uses a chrominance subcarrier to modulate the color difference signals R-Y, B-Y, superimposes them on the Y+S signal and gives the result to a 1st TV monitor 22 being the 1st display device as a video signal NTSC1. The R, G, B signals stored in storage processing circuits 24-26 are read respectively and inputted to an NTSC demodulation circuit 27, where they are demodulated into a video signal NTSC2, which is fed to a 2nd TV monitor 28 being the 2nd display device. Thus, two still picture recorded on a floppy disk are compared simultaneously by the two TV monitors 22, 28.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still image recording and reproducing apparatus for recording and reproducing still images on a magnetic recording medium such as a floppy disk.

[Prior Art] A conventional still image recording/reproducing device records, for example, one image on a magnetic recording medium.
It is known to record frame still images on two tracks with one field per track, and to play the still images and display them on a television monitor.

[Problems to be Solved by the Invention] Such conventional devices simply read, reproduce, and display still image signals recorded on a magnetic recording medium, and therefore play back a certain still image. Sometimes it was not possible to check still images recorded on other tracks. Therefore, when this device is used for medical purposes, for example, it is not possible to compare and view two still images at the same time.

The present invention provides a still image display device that stores a still image signal read from a magnetic recording medium so that a screen displaying the read still image signal as it is and a screen displaying the stored still image signal can be simultaneously viewed on different display devices. The present invention aims to provide an image recording and reproducing device.

[Means for Solving the Problems] This invention modulates a still image signal consisting of a luminance signal and a color difference signal by F~1 and magnetically records it on a magnetic recording medium.
In a still image recording and reproducing device that reads a recorded signal from the magnetic recording medium, demodulates it, and reproduces a still image signal, a first display device that displays one frame of the reproduced still image signal; One or more frame memories that store still image signals and a second display device that reads out and displays the still image signals stored in the frame memory are provided, and the first and second display devices each display different still image signals. It displays images.

[Operation] In the present invention having such a configuration, a large number of still image signals are subjected to FM modulation and recorded on a magnetic recording medium.

Then, a certain still image signal is read out from this magnetic recording medium and stored in the frame memory. Further, other still image signals recorded on the magnetic recording medium are read out and displayed on the first display device, and still image signals previously read out from the frame memory are read out and displayed on the second display device. In this way, different still images are displayed on the first and second display devices.

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

Figure 1 is a block diagram showing the circuit configuration of the recording system, in which 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 synchronous signal) and the R-Y, B-Y color difference signal generation circuit 1. This Y+S and (Y+S) signals from the color difference signal generation circuit 1 are converted to 7MHz by the first FM modulation circuit 2.
The signal is FM modulated with a carrier of 1 and supplied to the combiner 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-3ync is also generated by the line sequential processing switching signal generation circuit 5. is supplied to. This switching signal generation circuit 5 generates a switching signal for line sequential processing, and switches the contact 4a of the switching circuit 4 every horizontal scan to generate the (R-Y) signal from the Y+S and color difference signal generation circuit 1 and ( B-Y
) signals are alternately supplied to the second FM modulation circuit 6 for FM modulation and input to the synthesizer 3. In this case (RY)
The signal is FM modulated with a 1.2MH2 carrier and (B
-Y) The signal is FM modulated with a 1.3MHz carrier.

The synthesizer 3 adds and synthesizes the modulated signals inputted from each FM modulation circuit 2 and 6, and supplies the resultant signal to a pair of amplifiers 7a and 7b, respectively. Each of the amplifiers 7a and 7b is a thin film double head 8a for recording.

A recording current is applied to 8b to record a still image signal on a magnetic recording medium, such as a floppy disk. this.

For example, one field is recorded per track, and one frame is recorded using two tracks.

FIG. 2 is a block diagram showing the circuit configuration of the reproduction system, and 11a
, llb are thin-film double heads for reproduction that read still image signals recorded from a floppy disk. The signals read by each of the playback heads lla and llb are sent to an amplifier 12.
After being amplified by the above, the signal is supplied to the first FM demodulation circuit 14 via the bypass filter 13, and the demodulation circuit 14 performs FM demodulation to obtain the (Y+S) signal. Further, the signal from the amplifier 12 is supplied to the second FM demodulation circuit 16 via the low-pass filter 15 for FM demodulation, and the IH (1 horizontal scan) delay circuit 17 delays and undelayed signals. A (R-Y) signal is created by alternately switching and overlapping in the switching circuit 18, and a (B-Y) signal is created by alternately switching and overlapping delayed and non-delayed signals in the switching circuit 19. Each signal is N
The signal is supplied to a TSC demodulation circuit 20 and a primary color signal generation circuit 21, respectively. The (Y+S) signal from the first FM demodulation circuit 14 is also input to the NTSC demodulation circuit 20 and the primary color signal generation circuit 21.

The NTSC demodulation circuit 20 has (Y+S), (RY),
When each signal of (B-Y) is input, (R-Y), (B
-Y) after modulating the color difference signal with the color subcarrier (Y1S)
The signal is superimposed on the video signal NTSC1 and is supplied to a first TV monitor 22, which is a first display device.

The primary color signal generation circuit 21 has (Y+S), (RY),
When each signal (B-Y) is input, R
Create and output a primary color signal of SG%B. The R and G%B signals outputted from the primary color signal generation circuit 21 are passed through the opening/closing circuit 23 to the R signal storage processing circuit 24 and the G%B signal, respectively.
Signal storage processing circuit 25, B signal is stored in B signal storage processing circuit 2
6. Each of the storage processing circuits 24 to 26 A/D converts the input signal and stores it in an internal frame memory as a digital signal.

The contacts of the opening/closing circuit 23 are closed only when, for example, R, G, and B signals corresponding to one frame of still image signal are stored.

RlG and B stored in each of the storage processing circuits 24 to 26
The signals are each read out and input to the NTSC demodulation circuit 27, and the demodulation circuit 27 converts the video signal into an NTSC
2 and supplied to a second TV monitor 28, which is a second display device.

In this embodiment having such a configuration, for example, when there are two still images that one would like to compare, one of the still images is first read out from the floppy disk by the playback heads lla and llb, and the FM demodulation circuit 14. After FM demodulation at 16, (Y+S) signal, (RY) signal, (B-
Y) The signal is input to the primary color signal generation circuit 21 to generate R, G, and B primary color signals. These primary color signals are digitally converted and stored in storage processing circuits 24 to 26, respectively. The NTSC demodulation circuit 27 then stores and reads out each primary color signal.
The signal is demodulated into an NTSC2 signal and displayed on the TV monitor 28.

In this state, the playback heads lla and llb are moved to the recording position of the other still image to be compared. The other still image is subjected to FM demodulation by FM demodulation circuits 14 and 16, and the resulting (Y+S) signal, (RY) signal, and (B-Y) signal is converted into a video signal by an NTSC demodulation circuit 20.
The signal is demodulated to + and displayed on the TV monitor 22.

In this way, two still images recorded on the floppy disk can be compared simultaneously on the two TV monitors 22,28. Therefore, for example, if two still images are the same thing taken at different time timings, it is possible to clearly grasp the state of change in each other, and the scope of application for observation is wide.

In addition, in the above embodiment, the number of still images that can be stored in the signal storage processing circuits 24 to 26 is one frame, but the number of still images that can be stored in the signal storage processing circuits 24 to 26 is not necessarily limited to this. Still images may be selectively read out and displayed on the TV monitor 28;
A plurality of display devices may be provided so that all stored still images can be displayed on a monitor.

Furthermore, in the above embodiment, a primary color signal generation circuit is provided in the reproduction system, and the RlG and B primary color signals outputted from the circuit are digitally converted and stored, but the invention is not necessarily limited to this. Alternatively, the NTSC signal output from the NTSC demodulation circuit 2o may be digitally converted and stored, and then monitored.

[Effects of the Invention] As described in detail, according to the present invention, it is possible to provide a still image recording and reproducing device that can simultaneously compare and view a plurality of still images stored on a magnetic recording medium on different display devices. It is something.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. FIG. 1 is a block diagram showing the circuit configuration of the recording system, and FIG. 2 is a block diagram showing the circuit configuration of the reproduction system. 2.6...F~1 modulation circuit, 8a, 8b... recording head, ila, 1lb-reproducing head, 14°]6.
...FM demodulation circuit, 24, 25.26... Signal storage processing circuit, 22.28... TV monitor.

Claims (1)

[Claims] In a still image recording and reproducing apparatus that performs FM modulation on a still image signal consisting of a luminance signal and a color difference signal, magnetically records it on a magnetic recording medium, reads out the recorded signal from the magnetic recording medium, demodulates it, and reproduces the still image signal. a first display device that displays a still image signal of one frame that has been reproduced; one or more frame memories that store the still image signal of one frame that has been reproduced; and a first display device that reads out the still image signal stored in the frame memory. A still image recording and reproducing apparatus comprising: a second display device that displays a still image; and the first and second display devices display different still images.