JPS62267969A - Picture recording and reproducing device for still picture - Google Patents

Abstract

PURPOSE:To prevent the turbulence of an image, etc., at a reproducing time in a picture recording review mode, by controlling so as to select the output of a synchronizing separator circuit as a synchronizing signal in a picture recording mode, and the output of an oscillation circuit at a reproducing mode, and also, the output of the synchronizing separator circuit in the reproducing operation for a regulated time after a picture recording. CONSTITUTION:In the picture recording mode, a switch 65 is connected to a record processing circuit 61 side, and a switch 68 is connected to a waveform arranging circuit 66 side, and a switch 69 is turned on by a video output control signal VIDCH. And when a picture recording key 33 is depressed, a switch 64 is turned on by a record control signal REC only between continuous two pulses PG. Therefore, an FM-modulated video signal is sent to a magnetic head 51 during the time, and one field is recorded by one revolution of a magnetic disk 21. When a recording by the magnetic head 51 is terminated, the switch 65 is switched to a reproduction processing circuit 71 side synchronizing with the PG signal, and also, the switch 69 is turned off, and the video signal read by the magnetic head 51 is outputted from an output terminal 70 as a reproducing output.

Description

[Detailed Description of the Invention] Summary of the Invention A disk motor for rotating a magnetic disk comprises:
The rotational phase is controlled by the servo control device so that the synchronization signal of the video signal and the phase detection signal of the phase detector for detecting the rotational position 111 of the magnetic disk have a predetermined timing relationship. In the reproduction mode, the output of the internal oscillation circuit is used as the synchronization signal. In the recording mode, an external synchronization signal separated from the input video signal is used. Among the recording modes, there is a recording review mode in which a recorded image is played back for a certain period of time after recording, and in the playback operation in this recording review mode, the above-mentioned external synchronization signal is used as a synchronization signal.

Table of contents (1) Background of the invention (2) Overview of the invention (2, 1) Purpose of the invention (2, 2) Structure and effects of the invention (3) Description of embodiments (3, 1) Recordable still image playback Appearance of the device (3, 2
) Operation modes and their transitions (3, 3) Electrical configuration and operation of recordable still image playback device (1) Background of the invention The present invention has a plurality of recording tracks at an angle and records still images on these tracks. The magnetic head is moved in the radial direction of the magnetic disk on which the video signal is recorded to reproduce the signal from any track, and one image of the video signal output from the television camera, television receiver, etc. is reproduced as described above. The present invention relates to a still image recording and reproducing device that can also record on a magnetic disk.

A still image reproducing device reproduces a video signal recorded on a magnetic disk by a so-called electronic still camera or a video magnetic recording system.

When this reproduction output is applied to a television receiver, a still image is projected on the receiver's cathode ray tube. An electronic still camera is a combination of an imaging device such as a solid-state electronic image sensor and a recording device using a magnetic disk, and is used to electronically photograph a subject and record the still image on a magnetic disk. A video magnetic recording system electronically captures a still image appearing on a visible recording medium such as ordinary film or photographic paper and records it on a magnetic disk.

Such still image playback devices are becoming relatively widespread both as consumer products and for business use, but on the other hand, there is a demand for new functions to be added so that they can be used for more purposes. ing. One of them is the recording function. This records a single frame (one image or one screen) of a continuous video shot by a TV camera or a single frame of a dynamic image displayed on a TV receiver on a magnetic disk. This is a function to It is also desired to be able to immediately confirm whether or not a desired image has been recorded when a single frame consisting of an image is recorded.

Recording of video signals onto a magnetic disk does not have to be done at any arbitrary timing; unless it is done with reference to a certain reference angular position on the magnetic disk, reproduction will not be synchronized.

A phase detector is provided to detect the reference angular position of the magnetic disk, and recording or reproduction is performed so that the edge of the vertical synchronization signal appears when a period of 7H has elapsed from the phase detection by this phase detector. What should be done is determined by the Kikuraku.

A still image reproducing device is equipped with an internal synchronization signal oscillation circuit, and the rotation of the magnetic disk is controlled so that the generated synchronization signal and the phase detection signal satisfy the above relationship (internal synchronization). .

In order to record an input video signal onto a magnetic disk, it is necessary to maintain the above-mentioned predetermined relationship between the synchronization signal included in the video signal and the rotational phase of the magnetic disk.

Therefore, as mentioned above, the synchronization signal from the internal oscillation circuit is used during playback, but during recording, an external synchronization signal separated from the input video signal is used to control the rotation of the magnetic disk (external synchronization).

By the way, in patent application (1) filed simultaneously with the present application, the applicant newly created a recording review mode as one of the recording modes.

In this recording review mode, after one frame of the input video signal is recorded on the magnetic disk, the mode immediately shifts to the playback mode, and the recorded image is played back over a certain period of time (for example, 2 seconds).

(2) Summary of the Invention (2,1) Purpose of the Invention This invention solves a problem that occurs when a recording review mode is set in a still image recording/playback device that performs internal synchronization in playback mode and external synchronization in II image mode. This solves the problem.

The problems are as follows. In other words, in recording review mode, when recording, as external synchronization,
If the internal synchronization is then switched to during playback for a certain period of time, there is a problem in that the rotational phase of the magnetic disk is temporarily shifted, causing disturbances in the playback image.

(2,2) Structure and effect of the invention This invention provides a motor for rotating a magnetic disk;
A phase detector that generates a signal representing the rotational phase of the magnetic disk, a circuit that generates a synchronization signal for the video signal, and a phase signal detected by the above-mentioned detector and a synchronization signal of the synchronization signal generation circuit are input. , a motor control device that controls the motor to rotate at a predetermined number of rotations and to maintain a predetermined relationship between the input phase signal and synchronization signal. In the i-image recording and playback device, the synchronization signal generation circuit is combined with a synchronization signal oscillation circuit, a synchronization separation circuit for extracting a synchronization signal from an input video signal, and, in the case of recording mode, reproducing the output of the synchronization separation circuit. mode, the switch is controlled to select the output of the oscillation circuit, and when the recording review contest mode included in the recording mode is set, The present invention is characterized in that means is provided for controlling the changeover switch so that it selects the output of the synchronous #i port also during the reproduction operation.

Is there a recording review mode in this invention? Exceptionally, external synchronization is used only when live music is played. therefore.

External synchronization occurs when recording in recording review mode, and external synchronization also occurs during playback after this, and there is no switching of the synchronization signal.
Since the magnetic disks continue to rotate in the same phase, there will be no disturbance of images during playback.

Hereinafter, an embodiment in which the present invention is applied to the recordable still image reproducing device of the above-mentioned Patent No. 11i(1) will be described in detail.

(3) Description of Embodiments (3, 1) Appearance of still image reproducing device capable of recording FIG. 1 shows the external appearance of a still image reproducing device capable of recording, particularly its front operation panel.

On the left side of the front operation panel 11 of the still image reproducing device 10, a packet 13 for storing the disc back 2G and its cover 12 are rotatably supported at their lower ends. By pressing the eject button 16, the closed cover 12 and packet 13 are mechanically opened as shown in dashed lines.

Pressing the cover 12 closes and locks the cover 12 and packet 13. Further to the left side of the cover 12, a power button 14 and its indicator light 15 are provided.

The disk back 20 is a thin, small-diameter magnetic disk 21.
It consists of a case that rotatably accommodates the . A circular opening 22 is formed approximately in the center of the case, and the hub or core at the center of the magnetic disk 21 can be exposed through this opening. The disc back 20 is further provided with a shutter 23 movable in a direction parallel to one side thereof. This shutter 23 is opened when the disk back 20 is inserted into the packet 13, and a regulating plate 53 and a magnetic head 51 (see FIG. 4), which will be described later, can come into contact with the magnetic disk 21 inside. A claw 24 for preventing erroneous recording is provided on one side of the case of the disc back 20.

A number (for example, 50) tracks (for example, a track pitch of 100 μm) are provided concentrically on the magnetic disk 21, and each track carries an FM-modulated color video signal (for one image (one frame)). (including luminance signals, chroma signals, etc.) can be magnetically recorded.

FIG. 2 shows the relationship between the tracks provided on the magnetic disk 21 and the home position HP of the magnetic head. The 50 tracks arranged concentrically on the magnetic recording surface of the magnetic disk have N051 tracks in order from the outermost track.
Tracks N[L are attached from ~No. 59.

The home position HP is outside the track of Nα1. This home position HP is not attached to the magnetic disk 21, but is an extreme position assigned on the movement path of the magnetic head. Home position HP is detected by home position switch 84 (see FIG. 4).

Referring again to FIG. 1, a half of the front operation panel 11 is provided with an indicator 17 and various key switches and indicator lights. The display 17 is, for example, a liquid crystal display, and displays the track number of the magnetic disk 21 where the magnetic head 5 is currently located, various warnings (indicated by 17a), and the disk pack 20 contained in the packet 13. and pack presence (which indicates that packet 13 is closed)
17b) is displayed.

The key switches include keys 31, 32, 33, 34, 35 and 36 for instructing various operations, keys 41, 42, 43 and 44 for setting various modes.
There are keys 18 and the like for setting automatic forwarding time in playback mode. Indicator lights 45, 46.47 are key 41.4
2 and 43, and when these keys are pressed, the corresponding indicator lights are lit. The functions of these key switches will be clarified in the next page, ``Operating modes and their transitions.''

(3, 2) Operation modes and their transitions The still image playback device is capable of playing back and recording still images. When a video signal is recorded on the above-mentioned magnetic disk 21, it is possible to reproduce the video signal from the recorded track. Reproducing means reading an FM modulated signal from a predetermined track of a magnetic disk using a magnetic head, demodulating it, and outputting a standard color television video signal in NTSC format or the like. If the output terminal of this video signal is connected to a television receiver, the reproduced still image will be displayed on the cathode ray tube. Recording is based on the input of a standard color TV:1 video signal. This video signal may be provided by, for example, a television camera or television receiver. Recording involves modulating one frame of a given video signal by F1 and writing it onto a predetermined track on a magnetic disk using a magnetic head.

When displaying a screen on a television, interlaced scanning is generally performed, so a video signal is created so that one frame consists of two fields.

However, in static image recording devices such as the above-mentioned electronic still cameras, one field is made up of one frame (one picture, one image) in order to save the recording surface of the magnetic disk for recording video signals, and for other purposes. Video signals are often recorded on magnetic disks. This is called a field record. Furthermore, the manner in which one frame of image is obtained using the two fields described above is called frame recording. In this embodiment, field recording is performed, but it goes without saying that the present invention can also be applied to frame recording.

There are three recording modes: single-frame recording, recording review, and continuous shooting. In the recording mode (more specifically, the recording standby mode to be described later), the magnetic head must be kept on standby at an unrecorded track on the magnetic disk. When one-frame recording is selected, video signals for 11 frames (one field) are recorded on that track, and immediately thereafter the magnetic head moves to the next (ie, inner) track and waits. In the recording review mode, after recording one frame's worth of video signals on a track, the video and image signals recorded on that track are immediately played back and output for a certain period of time (for example, 2 seconds), and then the magnetic head moves to the next track. Move to and wait. In the snapshot mode, the above-described one-frame recording operation is performed continuously (for example, about 6 to 8 times per second).

The above-mentioned recording operations and other operations will be explained with reference to FIG. 3 in relation to the various keys shown in FIG. 1.

In stop mode, single frame key 43. When the review key 42 or the continuous shooting key 41 is pressed, the corresponding indicator light 47, 46 or 45 dots JT t- and the pressed key are memorized and the device enters the recording standby mode. Subsequently, when the record key 33 is pressed, a one-frame recording operation is performed if there is a memory that the one-frame key 43 was pressed, and a recording review operation is performed if there is a memory that the review key 42 was pressed. After these operations, the device returns to recording standby mode again. If the record key 33 is pressed while there is a memory of pressing the quick copy key 41, the quick copy operation is performed while the record key 33 is pressed, and when the record key 33 stops being pressed, the mode returns to recording standby mode. .

In order to prevent double recording on one track, if any signal has already been recorded on the track where the magnetic head is located, the various recording operations described above are prohibited and the actions of the 1 indicator lights 45 to 47 are disabled. Things flicker. Whether a signal is recorded on a track is determined by the envelope detection output, which will be described later.

In such a case, the forward key 32 or reverse key 31 can be pressed to move the magnetic head to the adjacent inner or outer track.

This is track feed mode. These keys 31.
Each time 32 is pressed, the magnetic head advances one track and then returns to recording standby mode.

However, it is also possible to search for the next unrecorded track after recording the video signal in each recording operation.

When erasing the signal of a recorded track.

From the stop mode, press the 1-frame key 43 and press the erase key 44.
Just press . When the erasing process for that track is completed, it returns to recording standby mode.

When the stop key 34 is pressed from recording standby mode, the magnetic head will move to the outside (unless erasing has been performed).
(in the opposite direction) for one track and then returns to the stop mode.

This means that in the two consecutive three recording modes, after recording,
This is because the magnetic head has been moved inward (forward direction) by one track.

When the forward key 32 or reverse key 31 is pressed from the stop mode, the mode shifts to the playback mode, and the video signal recorded on the track where the magnetic head is located is played back. If the forward key 32 or the reverse key 31 is pressed again, the magnetic head is sent to one track inside or outside, and the signal of that track is reproduced. Automatic feed key 3
5 is pressed and the automatic feed time is set using the key group 18, the magnetic head is sequentially fed in the forward direction at each set time, and +Ij recording is performed on each track. Furthermore, when the track number display key 36 is pressed, a signal for displaying the track number on which the magnetic head is located is superimposed on the reproduced video signal and output. The track number is displayed. When the stop key 34 is pressed, the system returns to the stop mode.

In any of the above modes, the track number where the magnetic head is currently located is displayed on the display 17.

In the initial state when the power is turned on by the power switch 14, the magnetic head is once returned to the home position HP, and then moved inward by a predetermined distance from there to be positioned at track k1.

In the recording mode, the magnetic head is moved in a so-called absolute track number system. That is, although the magnetic head is moved in the radial direction of the magnetic disk, the position of each track where the magnetic head is to be positioned is always determined based on the distance from the home position HP, with the position of the home position HP as a reference.

In playback mode, after the position of the large hole of the magnetic head is determined by the above-mentioned absolute track number formula, the center of the magnetic head is positioned at the center of the recorded signal based on the envelope detection described later. Fine position control is performed.

(3, 3) Electrical configuration and operation of still image reproducing device capable of recording FIG. 4 shows the electrical configuration of the still image reproducing device.

The overall operation of this still image reproduction device is supervised by a control device 50. This control device 50 is composed of a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory that stores its programs and necessary data, and an interface with each peripheral element circuit, device, etc. has been done.

When the disk back 20 is placed in the packet 13 and the packet 13 is closed, the disk back 20
The magnetic disk 21 inside is mounted on the spindle of a disk motor 54. Since recording or reproduction is performed by the magnetic head 51 while the magnetic disk 21 is being rotated, a regulating plate 53 is provided inside the cover 12 in order to maintain good contact between the magnetic head 51 and the magnetic disk 21 at all times. is provided. This regulating plate 53 is.

It has a groove along the moving path of the magnetic head 51, and is in contact with or close to the magnetic disk 21 at a portion other than the groove, so that the magnetic disk 21 is sandwiched between it and the magnetic head 51. The magnetic head 51 is connected to the magnetic disk 2 as described above.
A magnetic disk 2 is arranged so as to be movable in the radial direction of 1.
It is in contact with the magnetic recording surface of No. 1. In addition, the magnetic disk 21
The core 1t! A magnetic material is provided at one location to leak a part of the magnetic flux of the permanent magnet for cha-soking provided in the core, and this leakage magnetic flux is detected and one phase is detected for each rotation of the magnetic disk 21. A phase detector 52 that generates a detection nozzle PG is adjacent to the core.

The phase detection pulse PC of the phase detector 52 is input to the servo control circuit 56 and the control device 50.

A frequency generator 55 provided in the disk motor 54 outputs a signal with a frequency proportional to the number of rotations of the motor 54, and is applied to a servo control circuit 56. Furthermore, a vertical synchronization reference signal rerV is input to this servo control circuit 56. Based on such an input signal, the servo control circuit 56 rotates the disk motor 54 at a constant speed, for example, 3.800r, p, a+, and generates a phase pulse PG as shown in FIG. is the reference signal re
The rotational phase of the motor 54 is controlled so that it precedes the rise of rV by 7H (H is the period between two consecutive horizontal synchronization signals). Further, the servo control circuit 56 starts and stops the motor 54 in response to commands from the control device 50.

The control of the motor 54 by the servo control circuit 56 has the following meaning. Consider a case where an FM modulated video signal is recorded on a predetermined track of the magnetic disk 21 by the magnetic head 51. A standard format color video signal applied from a television camera, television receiver, etc. to the input terminal 6G is subjected to FM modulation of its luminance signal component and chroma signal component in the recording processing circuit 61, and these modulated signals are combined and sent to the amplifier circuit. 63.

This amplified FM change: A signal is the recording control switch
4 and a recording/reproduction changeover switch 65 to the magnetic head 51 . On the other hand, horizontal and vertical synchronization signals of the input video signal are extracted by a synchronization separation circuit 61a and sent to a waveform shaping circuit 66. As shown in FIG. 5, the waveform shaping circuit 66 creates and outputs a reference signal rarV having a leading edge synchronized with the leading edge of the input vertical synchronizing signal v5ync and having a duty ratio of approximately 1/2. It is something. This reference signal rcrV is given to the servo control circuit 56 via the synchronization changeover switch 68 (this is called external synchronization). Therefore, recording of the vertical synchronization signal is started on the magnetic disk 21 from a reference position that is offset by a rotation angle corresponding to a period of 7H from the position of the above-mentioned magnetic material that generates the 1-phase pulse PC. The video signal is then recorded.

In the case of reproduction, a similar vertical synchronization reference signal refV is applied from the single oscillation circuit 67 to the servo control circuit 56 via the switch 68 (this is called internal synchronization). By controlling the phase of the motor 54 using the reference signal refV and the phase pulse PC by the servo control circuit 56, P is always maintained.
The magnetic head 51 reads out the video signal from which the vertical synchronizing signal starts from the time 7H delayed from C.

The phase pulse PG is given to the control device 50, and since the video signal is synchronized with this pulse PG with a certain delay in both recording and reproduction, the control device 50 uses this pulse to control timing in various processes. This can now be done using PG as a reference. This is the significance of phase control of the motor 54.

The modulated video signal read from the magnetic disk 51 is input to the amplifier circuit 73 via the changeover switch 65, and further sent to the reproduction processing circuit 71 and envelope detection circuit 72. The reproduction processing circuit 71 is.

The input modulated luminance signal and chroma signal are respectively demodulated and combined and outputted to the output terminal 70 as a standard color video signal. When this video signal is applied to a television receiver, a still image for one frame is displayed on a cathode ray tube.

The erase signal generation circuit 62 generates an erase signal,
For example, 4.5~20MH for a certain period of time (about 1 degree)
A signal whose frequency is continuously swept over about z is generated.

The magnetic head 51 is supported movably in the radial direction of the magnetic disk 21 and is controlled to be moved in the same direction by a transfer drive control device 57. The control device 50 controls the magnetic head 5
1 is given to the device 57 as to the direction and amount of transfer. The device 57 includes a step motor, and the magnetic head 51 is moved in proportion to the rotation angle of the step motor. For example, each drive pulse of the step motor rotates the motor approximately 15 degrees, thereby moving the magnetic head 51 approximately 8.33 μm (1 pitch).

Therefore, the magnetic head 51 is moved very accurately.

The envelope detection circuit 72 is a detection circuit that detects the envelope of the read signal of the magnetic head 51, that is, the FM modulated video signal recorded on the track of the magnetic disk 21, and outputs a voltage signal corresponding to the envelope. be.

The voltage signal representing the envelope is converted by an analog/digital converter (A/D converter) built into the circuit 72 into an 8-bit digital signal representing a quantization level of, for example, 25δ, and is input to the control device 50. do.

The envelope detection signal is used to search for unrecorded tracks on the magnetic disk 21 and to detect the center position of recorded tracks (in playback and erase modes). If the level of the detected signal does not reach a predetermined threshold level when the magnetic head 51 is moved across a track, that track is unrecorded.

When reproducing a video signal, after the magnetic head 51 is positioned by the above-mentioned absolute address method, the magnetic head 5
1 is moved inward or outward one pitch at a time, the position where the detected signal shows a peak is searched, and the position where this peak is shown is determined to be the center of the track where the video signal is recorded, and the magnetic head 51 The video signal is reproduced in a state where it is positioned at this center. This peak search is similarly performed for erasing the video signal, and areas within a certain range on both sides of the peak position are targeted for erasure.

Recording control switch 64. Record/playback switch 65.
Synchronization changeover switch 68 and video output control switch 69
is shown as a contact switch, but of course it is generally realized by a non-contact switch made of a semiconductor element or the like. These switches are controlled to be turned on and off by the control device 50 as follows.

In the recording mode, the switch 64 is turned on at a certain timing, and the switch 65 is turned on at a certain timing, with exceptions described later.
is connected to the recording processing circuit 61 side, the switch 68 is connected to the waveform shaping circuit 66 side, and the switch 69 is turned on. That is, when the recording standby mode is entered, the changeover switches 65 and 68 are respectively switched as described above by the recording/playback switching signal REC/PB and the synchronization switching signal 5YCH from the control device. Further, the switch 69 is turned on by the video output control signal VIDCH. When the recording key 33 is pressed, the switch 64 is turned on by the recording control signal REC only between two consecutive pulses PC, as shown in FIG. Therefore, the FM modulated video (No. 5) is sent to the magnetic head 51 during this time, and one field is recorded in one revolution of the magnetic disk 21. At this time, since the switch 69 is on, the input The video signal input to the terminal 60 is output as is to the output terminal 70.

When the recording review 42 is stored (recording review mode), playback is performed after recording as described above. Therefore, when the recording by the magnetic head 51 is completed, the switch 65 is activated by the reproduction processing circuit 7 in synchronization with the PG double signal.
1 side and the switch 69 is turned off. Therefore, the video signal read by the @ki head 51 is output from the output terminal 70 as a reproduction output. Then, after a certain period of time, these switches 65, 69 return to the above-mentioned state again.

In recording review mode. Even during the reproduction described in 1-1, the changeover switch 68 remains connected to the waveform shaping circuit 66, and external synchronization is performed. That is, since a video signal is input to the input terminal 60, servo control is performed based on the synchronization signal.

As shown later, in playback mode, selector switch 6
8 is connected to the oscillation circuit 67 side for internal synchronization, but during playback in the recording review mode, switching from external synchronization to internal synchronization is not performed, and external synchronization continues throughout. This is because when switching from external synchronization to internal synchronization, the rotational phase of the disk motor 54 is temporarily shifted, which causes distortion in the video signal output from the output terminal 70, causing distortion in the image displayed on the cathode ray tube. This is because disorder occurs.

In the erase mode, the states of the switches 64, 65, 68 and 69 are the same as in the record mode.

In the reproduction mode, switches 64 and 69 are kept off, switch 65 is switched to the reproduction processing circuit 71 side, and switch 68 is switched to the oscillation circuit 67 side.

All operation mode switching and various operations are performed based on inputs from various switches and various keys. The various switches have packets 13 and magnetic disks 21 in them.
is closed to a position where it will be securely attached to the spindle of the disk motor 54.
End switch 81. A pack switch 82 for detecting that a disk pack 20 is contained within a closed packet 13. An erroneous recording prevention switch 83.1 for detecting that the erroneous recording prevention claw 24 of the disk pack 20 housed in the packet 13 has been removed and does not exist (that is, recording is prohibited) - the home position switch 84 described above, etc. be. The various keys include a series of keys 31 to 36, 41 to 44, and 18 provided on the front operation panel 11. The control device 50 operates at a constant period (for example, 1
A key scan routine is performed every 780 seconds), and in this key scan routine, the control device 50
sends a key scan pulse to the above-mentioned switch group and key group, and detects and stores the on/off states of the switches and keys depending on whether or not this pulse returns.

Furthermore, the control device 50 controls the display of the indicator lights 45 to 47 based on the above-mentioned key scan routine.

It also controls the display of the display 17 based on routines for various operations.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of a still image reproducing device capable of recording iJ. Figure 2 shows the number of the second track on the magnetic disk and the home
This indicates the position. FIG. 3 shows various operating modes and how the operating modes change in response to inputs from various keys. FIG. 4 is a block diagram showing the electrical configuration of a recordable still image playback device. FIG. 5 is a time chart showing the synchronous control of the disk motor by the servo control circuit and the recording timing. 21... Magnetic disk, 50... Control device. 51... Magnetic head, 52... Phase detector. 54...Disc motor. 56... Servo control circuit. 61a...Synchronization separation circuit. 66... Waveform shaping circuit, 67... Oscillation circuit. 68...Synchronization signal changeover switch. ” - Patent applicant Fuji Photo Film Co., Ltd. Agent
Patent attorney Asamichi Kato (
(1 person outside)

Claims (1)

[Claims] A motor for rotating a magnetic disk, a phase detector that generates a signal representing the rotational phase of the magnetic disk, a circuit that generates a synchronization signal for a video signal, and a phase signal detected by the phase detector. and a synchronization signal of the synchronization signal generation circuit, and controls the motor so that it rotates at a predetermined number of rotations and maintains a predetermined relationship between the input phase signal and the synchronization signal. In a still image recording and playback device equipped with the above, the sync signal generation circuit is divided into a sync signal oscillation circuit, a sync separation circuit that extracts a sync signal from an input video signal, and, in the case of recording mode, a sync separation circuit. The output is composed of a changeover switch that is controlled to select the output of the above oscillation circuit in the case of playback mode, and furthermore, when the recording review mode included in the recording mode is set, the output of the recording A still image recording and reproducing apparatus, characterized in that a still image recording and reproducing apparatus is provided with means for controlling the changeover switch so that it selects the output of the synchronization separation circuit even during a later reproduction operation for a certain period of time.