JPS61202336A - Still picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the S/N deterioration of the video signal in a dubbing or editing mode by providing plural magnetic recording/reproducing means to a magnetic disk for recording/reproduction of the modulated video signals. CONSTITUTION:The frame FM modulated video signals recorded on two tracks of a magnetic disk 25 set opposite to a video head 29 are frame-recorded to a magnetic disk 26. At the same time, the images field-reproduced by the disk 25 can also be field-recorded to the disk 25 by actuating recording head amplifiers 34 and 35 after connecting an analog switch 37 to an input contact I7, an analog switch 39 to an input contact I8 and the output contact of an analog switch 38 to the Q5 and Q6 respectively. Thus the dubbing and editing jobs are possible between both disks 25 and 26. Then the reproduced FM modu lated video signals are supplied directly to a recording head amplifier through an AGC circuit 40. This minimize the S/N deterioration of the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to the method of transmitting one field or one frame of a video signal onto a track of a disc-shaped rotating magnetic recording medium (hereinafter abbreviated as a magnetic disk) using a predetermined modulation method. Regarding a still image recording and reproducing device that modulates and converts it into a modulated video signal to form an endless recording track, it is particularly useful when editing or dubbing video recorded on a magnetic disk to another magnetic disk. The present invention relates to a still image recording and reproducing device suitable for reducing S/N deterioration.

(Background of the Invention) Still image recording in which one field or one frame of a video signal is modulated on one track of a magnetic disk using a predetermined modulation method and converted into a modulated video signal to form endless recording tracks. In recent years, as playback devices, electrophotographic systems using magnetic disks have been proposed, such as electronic still cameras integrated with magnetic disk recording devices and recording services from 35 mm negative films to magnetic disks through photo labs. When such systems become popular in ordinary households, it is conceivable that images recorded on magnetic disks will be preserved as commemorative photographs, but since a single magnetic disk can record several dozen frames of images, After shooting a large amount using an electronic still camera, etc., edit and record only the desired frames from the played back footage onto another magnetic disk, and then demagnetize and reuse magnetic disks that no longer need to be stored. It is thought that this will be done. Also, similar to floppy disk drives used as auxiliary storage devices in computers, it is also possible to make copies of important magnetic disks and use those copies for playback, or to make and distribute large numbers of copies. Therefore, it is considered essential for an electrophotographic system to have a device that can easily perform editing and dubbing while minimizing deterioration in image quality.

In addition, by recording a time-compressed and modulated audio signal in addition to the video signal on the magnetic disk, it can be used as a memo when shooting, or the audio that matches the video recorded on the magnetic disk can be recorded on the same magnetic disk. By recording on a separate track above, you can play back the audio at the same time as the video to create a sense of realism, and it is also possible to listen to the explanation of the video in audio. In this way, when it becomes possible to record audio as well as video on the same magnetic disk, the need for video dubbing and editing will increase, and audio dubbing and editing can also be done easily while minimizing S/N deterioration. It is thought that there will be a need for equipment that can do this.

By the way, when performing such editing and dubbing using conventional magnetic recording and reproducing devices, at least two magnetic recording and reproducing devices are required, and by connecting them, a recording and reproducing system as shown in Fig. 2 is created. had to be configured.

In the figure, side A and side B separated by dotted lines each represent a recording/reproducing mechanism of a separate magnetic recording/reproducing device,
1 and 2 are magnetic disks, 3 and 4 are drive motors that rotate the magnetic disks 1 and 2 mounted thereon, and 5 and 6 are recording and reproducing heads 5a and 5b.

This is a video head in which two heads 6a and 6b are formed close to each other at one track interval. In an embodiment of the invention,
The video signal for one field is FM modulated for each track and recorded. Below, the FM modulated video signal is
(abbreviated as "modulated video signal")) Using the video heads formed by forming two heads close to each other at one track interval, one continuous frame worth of video signal is recorded one field at a time on a track facing each head. By performing this, frame recording is possible, and video signals for one continuous frame on the two adjacent tracks are simultaneously played back on the two tracks using the video head, and the two reproduced FM modulated video signals are reproduced for each field. Frame reproduction is possible by switching the signal and inputting it to the FM demodulation circuit.

7.8 and 9.10 are video heads 5a and 5b.

Reproduction head amplifiers 5a and 5b amplify the reproduced FM modulated video signal;
This is a recording head amplifier that supplies signals to the a, 5b, 6a, and 5b. The input terminals of the playback head amplifiers 7.8 and 9.10 are connected to the output terminals of the recording head amplifiers 11, 12, 13, and 14, respectively, and are connected to the output terminals when the recording head amplifiers are in operation. The input impedance of the playback head amplifier is configured to be high impedance, and the output impedance of the head amplifier connected to the input terminal of the playback head amplifier is configured to be high impedance while the playback head amplifier is operating. It is prohibited for the recording amplifier and playback amplifier connected to the head to operate at the same time.

17.18, 19.20 are analog switches,
The analog switches 19 and 2o are connected to the video heads 5a and 5.
The reproduced field FM modulated video signals reproduced by channels b, 5a, and 5b are switched field by field to synthesize a reproduced frame FM modulated video signal.

21.22 is an AGC circuit, 23.24 is an Fkl tuning circuit, and the FM demodulated video signal is outputted to output terminals 0UTA and 0LJTB, respectively.

Reference numerals 15 and 16 designate FM modulation circuits that FM modulate the video signals supplied from the input terminals INA and INB and supply them to the analog switches 17 and 18. The output contact Q1 of the analog switch 17 is connected to the input terminal of the recording head amplifier 11, the output contact Q2 is connected to the input terminal of the recording head amplifier 12,
The output contact Q3 of the analog switch 18 is connected to the input terminal of the recording head amplifier 13, and the output contact Q4 is connected to the input terminal of the recording head amplifier 14. Here, the frame recording operation of the A-side magnetic recording/reproducing device will be explained. The video signal input to the input terminal INA is sent to the FM modulation circuit 1.
5 and is FM modulated and input to the analog switch 17.

The analog switch 17 is first connected to the output contact Q1 side, the recording amplifier 11 operates for one field period, and one field worth of video is recorded on the magnetic disk 1 through the video head 5a. Immediately after the recording amplifier 11 operates for one field period, the analog switch 17 closes the output contact Q.
2 side, the recording amplifier 12 operates for one field period, and the recording amplifier 12 outputs data from the magnetic disk 1 through the video head 5b.
Then, the video for one remaining field is recorded on an adjacent track, and frame recording is completed.

Next, in the recording and reproducing system having such a configuration, the FM modulated video signal recorded on the magnetic disk 1 is
The operation when dubbing to the other magnetic disk 2 will be explained.

First, the A-side magnetic recording/reproducing device is set to the reproducing mode, the B-side magnetic recording/reproducing device is set to the recording mode, and the A-side output terminal 0UTA and the B-side input terminal INB are connected.

In the magnetic recording and reproducing device on the A side, video heads 5a and 5b
The video signals for two tracks recorded on the magnetic disk 1 are played back simultaneously, and after being amplified by the playback head amplifier 7.8, the analog switch 19 is switched every 1 field period, and the playback frame FM modulated video is After being combined into a signal and supplied to the AGC circuit 21 and having its amplitude corrected,
'After being supplied to the FM demodulation circuit 23 and demodulated, it is output as a reproduced frame video signal from the output terminal 0UTA.

The reproduced frame video signal output from the output terminal 0UTA is supplied to the FM modulation circuit 16 via the input terminal INB, and after being FM-modulated again, it is sent to the analog switch 18. Recording amplifiers 13, 14. Frames are recorded on the magnetic disk 2 by the video heads 5a and 6b, and the same track pattern as the magnetic disk 1 is formed on the magnetic disk 2, and dubbing is completed.

(Problem to be Solved by the Invention) However, when dubbing or editing is performed in a system in which two magnetic recording and reproducing devices are connected in this way, after the FM modulated video signal that was reproduced on one side is FM demodulated, the FM modulated video signal is Since modulation is used for recording, there are problems in that the S/N is degraded by the amount of FM demodulation and FM modulation, and an additional magnetic recording/reproducing device is required for dubbing or editing.

In addition, in the case where a signal obtained by time-compressing and modulating audio in addition to the video signal is recorded on the above-mentioned magnetic disk, in order to dub or edit the audio, a magnetic recording and reproducing device capable of recording and reproducing the audio is required. Not only did it require two units, but there was also the problem of S/N deterioration, similar to the case of video.

(Object of the invention) The present invention has been made in view of these problems,
It is possible to suppress S/N deterioration of the video signal during dubbing or editing, and the mechanism is also simple, even when recording time-compressed and modulated audio signals in addition to video signals on the magnetic disk mentioned above. It is an object of the present invention to provide a still image recording and reproducing device that allows dubbing and editing with exactly the same device.

(Summary of the Invention) In order to achieve this object, the present invention modulates a video signal using a predetermined modulation method such as FM modulation, converts it into a modulated video signal, and records and reproduces the modulated video signal on a magnetic disk. A still image recording and reproducing device, comprising a plurality of magnetic recording and reproducing means for recording and/or reproducing the modulated video signal on a magnetic disk, and a still image recording and reproducing device equipped with a magnetic disk on which the modulated video signal is recorded. The technical point is that the modulated video signal is recorded on a magnetic disk other than the magnetic disk connected to the other magnetic recording/reproducing means without demodulating or modulating it.

(Example) An example according to the present invention will be described based on FIG. In the figure, 25 and 26 are magnetic disks, 27 and 28 are drive motors that rotate the attached magnetic disks 25 and 26, and 29 is a recording and reproducing head 29a and 29b that are arranged close to each other at a one-track interval. This is a video head formed using a 5°6. 30 is a single video head consisting of a single recording/reproducing head; 31, 3;
2.33 is a reproduction head amplifier similar to 7, 8, 9, 10, and 34, 35, 36 is a recording head amplifier similar to 11.12, 13.14. 37, 38.39 are analog switches, 40 is an AGC circuit similar to 21.22, 41
42 is an FM demodulation circuit that FM demodulates the FM modulated video signal from the AGC circuit 40 and outputs it to the output terminal 0UTC, and 42 is an FM modulation circuit that FM modulates the video signal from the input terminal NC.

Here, the analog switch 37 has input contacts 15°16,
The input contact 15 is connected to the output terminal of the reproduction head amplifier 31, the input contact 6 is connected to the output terminal of the reproduction head amplifier 32, and the input contact 7 is connected to the output terminal of the reproduction head amplifier 33. Analog switch 38 has output contact Q5.
Q6. Q7, and the output contact Q5 is the recording head amplifier 3.
The output contact Q6 is connected to the input terminal of the recording head amplifier 35.
The output contact Q7 is connected to the input terminal of the recording head amplifier 36. The analog switch 39 is connected to the input contact 18. The input contact I8 is connected to the output terminal of the AGC circuit 40, and the input contact I9 is connected to the output terminal of the FM modulation circuit 42.

Next, the operation of the system having such a configuration will be explained.

In the embodiment of the present invention, analog switch 39 is connected to input contact Q9, and analog switch 38 is connected to output contact Q5. By switching with Q6, the magnetic disk 25
The video signal input from the input terminal INC can be recorded in frames. In addition, the input contact 15 of the analog switch 37
．． By switching I6, frames of video recorded on the magnetic disk 25 can be played back. Therefore, the same function as one magnetic recording/reproducing device on the A side or B side shown in FIG. 2 can be realized. Furthermore, in the embodiments of the present invention,
By connecting the analog switch 39 to the input contact I9 side and the analog switch 38 to the output contact Q7 side, the video signal input from the input terminal INC can be field-recorded on the magnetic disk 26. Further, by connecting the analog switch 37 to the input contact I7 side, the video recorded on the magnetic disk 26 can be reproduced in the field. Here, dubbing and editing can be done if there is a function for field playback on one magnetic disk and a function for field recording the playback output on another magnetic disk, but if the video to be recorded is Perform frame playback or field playback on the magnetic disk, select the video track to be recorded, record it on another magnetic disk, and then immediately play it back after recording to confirm whether the recording was performed normally or not. It is preferable to have a playback function for checking. Furthermore, since it has the same functions as conventional magnetic recording and reproducing devices, it is necessary to have a function to record frames and a function to reproduce frames of video signals input from the outside. In addition, double video heads for frame recording and playback are more expensive than single video heads that can only perform field recording and playback, and because they can reduce the number of recording head amplifiers and playback head amplifiers, they are more expensive than magnetic disks. It is considered preferable in terms of cost and usability to provide a frame recording and reproducing function on a separate magnetic disk and a field recording and reproducing function on a separate magnetic disk.

The operation when recording the video recorded on the magnetic disk 25 onto the other magnetic disk 26 will be described below. First, the input contact I5 of the analog switch 37. I6
are switched field by field to reproduce frames of the video recorded on the magnetic disk 25, and the AGC circuit 40. FM
The reproduced video signal outputted to the output terminal 0UTC through the demodulation circuit 41 is observed on a TV monitor, etc., and the video head 2
9 in the radial direction of the magnetic disk 25 to move the video head 29 to the track of the desired frame, first connect the analog switch 39 to the input contact I8 side, and connect the input contact of the analog switch 37 to the 15 side. 1
Output contact Q of analog switch 38 only during the field period.
5 side and operate the recording head amplifier 36,
A reproduction field FM modulated video signal reproduced from the magnetic disk 25 by the video head 29a and the reproduction amplifier 31 is sent to the analog switch 37. AGC circuit 40. The data is recorded on the magnetic disk 26 by the recording amplifier 36° single video head 30 through the analog switches 39 and 38. Next, the video head 30 is moved by one track, and the analog switch 38 is connected to the output contact Q6 side for one field period in which the input contact of the analog switch 37 is connected to the 16 side, and the recording head amplifier 36 is operated. Then, the reproduction field FM modulated video signal reproduced from the magnetic disk 25 by the video head 29b and the reproduction amplifier 32 is transferred to the analog switch 37. ΔGG circuit 4Q, analog switch 39.
38 through recording amplifier 36, single video head 3
0 is recorded on the magnetic disk 26. By the above operation, the magnetic disk 2 facing the video head 29 is
The frame FM modulated video signals recorded on the two tracks No. 5 are frame-recorded on the magnetic disk 26.

In addition, for the video field-played from the magnetic disk 26, the analog switch 37 is connected to the input contact I7 side,
By connecting the analog switch 39 to the input contact ■8 side, connecting the output contact of the analog switch 38 to the 05 or Q6 side, and operating the recording head amplifier 34 or 35, field recording on the magnetic disk 25 becomes possible. .

As described above, in the embodiment of the present invention, the magnetic disk 25
It is possible to dub and edit from to 26 to 26 or from magnetic disk 26 to 25, and after FM demodulating the reproduced FM modulated video signal reproduced from the magnetic disk as in the case of using a conventional device, it is FM modulated again and recorded. Instead, the reproduced FM modulated video signal is passed through the AGC circuit 40 to suppress fluctuations in the signal width due to the orientation of the magnetic disk, and is input directly to the recording head amplifier, resulting in the above-mentioned S/N ratio. It is possible to keep deterioration to a minimum.

In addition, in the embodiment of the present invention, by connecting a television monitor to the output terminal 0UTC, dubbing and editing can be performed while viewing the reproduced image, and a disc that has been dubbed or edited can be immediately played back by simply switching the analog switch 37. However, it is also possible to configure the analog switch 37 to be automatically switched for a certain period of time after the recording head amplifier is operated to reproduce the recorded track number.

In the embodiment of the present invention, one magnetic recording and reproducing device having frame recording and reproducing functions and field recording and reproducing functions was used, but the same effect can be obtained with two frame recording and reproducing devices or two field recording and reproducing devices. In addition, one of the two devices may be used as a recording or reproduction-only device.

In addition, in the embodiment of the present invention, an analog switch is provided on the hex terminal side of the recording head amplifier and on the output terminal side of the playback head amplifier, but between the recording head amplifier and the video head or between the video head and the playback amplifier. By connecting analog switches, it is also possible to reduce the number of recording head amplifiers or reproduction head amplifiers.

(Effects of the Invention) As explained above, according to the present invention, the modulated video signal reproduced from one magnetic disk is directly recorded on the other magnetic disk without being demodulated or modulated. It is possible to minimize deterioration in S/N and provide an inexpensive magnetic recording and reproducing system for still image signals.

Furthermore, even if a signal obtained by time-compressing and modulating audio in addition to a video signal is recorded on a magnetic disk, according to the present invention, the signal reproduced from one magnetic disk can be directly recorded on the other magnetic disk. Therefore, it is possible to dub and edit tracks on which audio is recorded using the same device, and furthermore, deterioration in S and /N can be kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a still image recording device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional still image recording device. 29.30: Video head

Claims (1)

[Claims] Still image recording and reproduction in which one field or one frame of a video signal is modulated on one track of a disc-shaped rotating magnetic recording medium using a predetermined modulation method and converted into a modulated video signal to form endless recording tracks. The apparatus includes a plurality of magnetic recording and reproducing means for recording and/or reproducing the modulated video signal on the disc-shaped rotating magnetic recording medium, and a magnetic recording and reproducing unit equipped with the disc-shaped rotating magnetic recording medium on which the modulated video signal is recorded. The reproduced modulated video signal is recorded on a disc-shaped rotating magnetic recording medium different from the disc-shaped rotating magnetic recording medium attached to the other magnetic recording/reproducing means without demodulating or modulating the reproduced modulated video signal. A still image recording and reproducing device.