JPH0422279A - Picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a picture recording and reproducing device capable of frame recording or reproduction by means of one-channel magnetic head by providing a picture memory having a storage capacity of one field, using the memory as a buffer at frame recording and using the memory as a storage medium for frame reproduction. CONSTITUTION:A control circuit 38 throws switches 14, 16 to the position of R contact in the recording mode, a camera section 10 is driven in response to the operation of a release switch to drive a magnetic disk 26. An output of an image pickup signal processing circuit 12 is fed to a recording processing circuit 18 via switches 14, 70, 72, 16, a signal amplified by a recording amplifier 20 is fed to a magnetic head 24 via a switch 22 thereby allowing the magnetic disk 26 to record a field video signal. In the case of reproduction, the control circuit 68 throws switches 14, 16 to the position of P contact. The output of the magnetic head 24 is fed to a reproduction processing circuit 36 via the switch 22 and a reproduction amplifier 34 and its output is fed to a delay circuit 38 and a (b) contact of a switch 40 via the switches 14, 70, 72, 16. Then the switch 40 is switched for each field to eliminate skew at field reproduction. The output of the switch 40 is amplified by an output amplifier 42 and outputted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image recording and reproducing device.

[Prior Art] A still image recording and reproducing device using a magnetic disk called a still video floppy as a recording medium has been proposed.

The magnetic disk can record one field of video signals on one track, and frame video signals are recorded on two tracks.For example, in the case of an NTSC signal, the magnetic disk is rotated at 3.60 rpm. . 1
Conventionally, for frame recording that records the video signal of a frame, a 2ch head and a frame memory, which are two integrated magnetic heads separated by one trunk pitch, are installed. The bow was recorded on two separate adjacent tracks2, and when playing back, the two outputs of the 2ch head were switched every 1/60 seconds7.

[Problems to be Solved by the Invention] In this way, there are two steps required to record or reproduce a frame video signal.
Since an eh head is required or an expensive single head is used in this type of magnetic head, this type of magnetic head has the disadvantage of being more expensive than devices using a leh head. Also,
In a 2ch head, it is necessary for the two magnetic heads to evenly contact the magnetic disk, but in order to achieve this,
High precision is required for the magnetic head transport and support mechanism. This also leads to higher prices.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image recording/reproducing apparatus that can perform frame recording or reproduction using an Lch magnetic head.

[Means for Solving the Problems] An image recording and reproducing apparatus according to the present invention is an image recording and reproducing apparatus that performs recording on or reproducing from a recording medium using a single magnetic head, and is capable of recording images with a storage capacity of one field. A memory is provided, and during frame recording, the image memory is used as a buffer until the magnetic head can record the second field video signal on the recording medium, and during frame playback, the image memory is used as a buffer for recording the second field video signal on the recording medium. It is characterized by being used as a storage medium for one of the reproduced video signals.

[Operation] The above means enables frame recording and frame reproduction using a single magnetic head. Therefore, expensive 2eh
No need to use a head.

"Example code" Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention applied to an electronic still camera. 10 is a camera unit including an image sensor, a photographing optical system, and a shutter; 12 is a camera unit 1
1 is an imaging signal processing circuit that processes the output signal of 0 (7) and outputs a video signal. 1416 is a recording/playback switch that connects to the R contact in recording mode and the P contact in playback mode; 1
8 is a recording processing circuit for recording and processing a video signal; 20 is a recording amplifier; 22 is a switch that is connected to the A contact only when recording on a magnetic disk 26 (to be described later); otherwise connected to the B contact; 24 is a magnetic head; 26 is a magnetic disk as a recording medium, 28 is a motor that rotates the magnetic disk 26, 30 is a head moving mechanism that moves the magnetic head 24 in the radial direction of the magnetic disk 26, and 32 is a PG that detects the rotational phase of the magnetic disk 26. It is a coil. 34 is a reproduction amplifier, 36 is a reproduction processing circuit, 38 is 1/2H (IH is 1
40 is a switch for removing noise during field reproduction; 42 is an output amplifier; and 44 is an output terminal.

Further, 50 is an A/D converter, 52 is a memory having a storage capacity for one field, 54 is a switch for selecting the output of the A/D converter 50 or the output of the memory 52, and 56 is a switch selected by the switch 54. This is a D/A converter that converts the digital signal back into an analog signal.

A portion consisting of the circuits 50 to 56 is configured to be detachable from other circuit portions as an adapter 58.

60 is an adapter detection switch that is closed when the adapter 58 is connected; 62 is a field/frame selection switch that is closed by the user's operation; and 64 and 66 are the user's controls for moving the magnetic head 24 by the head moving mechanism 30. The instructing head movement switch 68 is a control circuit that controls the entire system. 7072 is a when the adapter 58 is not used.
It is a switch that connects to the contact and connects to the a or b contact when it is to be used.

First, connect the adapter 58 1. Explain the operation when not in use. In this case, since the switch 60 is in the open state, the operation of the switch 62 is invalid, and in response, the control circuit 66 connects the switch 7072 to the a contact.

In recording mode, the control circuit 68 switches 14.16
Connect to the R contact. The control circuit 68 drives the camera unit 10 in response to operation 1 of a release switch (not shown).
, the magnetic disk 26 is rotated by the motor 28 at a speed of 3.60
Rotate with Orpm. The image signal processing circuit 12 performs well-known processing such as γ conversion and white balance on the output of the camera unit 10, and outputs the processed signal. The output of the imaging signal processing circuit 12 is applied to the recording processing circuit 18 via switches 14.70 and 72.16. Recording processing circuit 8 performs FM modulation on the input signal and outputs it to the recording amplifier 20. Recording amplifier 2
The signal amplified by 0 is applied to the magnetic head 24 via the switch 22, whereby a field video signal is recorded on the magnetic disk 26.

Note that the control circuit 68 defines the output timing of the camera unit 10 so that the vertical synchronization signal of the video signal to be recorded and the output of the PG coil 32 have a constant phase relationship.

When performing field reproduction of the video signal recorded on the magnetic disk 26, the control circuit 68 connects the switch 1416 to the P contact. The output of the magnetic head 24 is applied to a reproduction processing circuit 36 via a switch 22 and a reproduction amplifier 34. The reproduction processing circuit 36 performs reproduction processing such as FM demodulation, and its output is applied to the delay circuit 38 and the b contact of the switch 40 via the switches 14, 70, 72, and 16.

The output of the delay circuit 38 is connected to the a contact point of a switch 40, and by switching the switch 40 for each field, skew during field reproduction can be removed. The output of the switch 40 is amplified by an output amplifier 42 and output from an output terminal 44.

Next, the operation when connecting and using the adapter 58 will be explained. When adapter 58 is connected, switch 60 is closed. In this state, if the user selects to open the switch 62, the operation will be the same as described above (and in the disconnected state of the adapter 58). Explain the operation.

Describe the frame recording mode. At this time, the control circuit 6
8 connects the switch 14, 1.6 to the R contact. The control circuit 68 drives the camera unit in frame mode according to the closed switch 6062, and the camera unit 10 continuously outputs the first and second field imaging signals. When the imaging signal processing circuit 12 outputs the first field video signal, the control circuit 68 connects the switches 70 and 72 to the a contact point, and therefore, the magnetic disk is The video signal of the first field is recorded in 26.

When the imaging signal processing circuit 12 outputs the second field video signal, the control circuit 68 sets the switches 70 and 72 to b.
The second field video signal output from the imaging signal processing circuit 12 is connected to the A/D converter 50.
is digitized and stored in memory 52. Further, after the recording path r of the first field video signal onto the magnetic disk 26, the control circuit 68 causes the head moving mechanism to move the magnetic head 24 to an adjacent track. magnetic head 2
After the movement of field 4 is completed and the storage of the second field video signal 1 and the second field video signal in the memory 52 is completed, the control circuit 68 reads out the signal stored in the memory 52. The data read from the memory 52 is applied to the D/A converter 56 via the switch 54 and converted back into an analog signal. And switch 7
2.16 to the recording processing circuit 18, and is recorded on the magnetic disk 26 in the same way as the first field.

Next, the operation in frame playback mode will be explained. At this time,
The control circuit 68 connects the switch 14.16 to the P contact;
Connect switches 70 and 72 to the b contact. magnetic head 2
The reproduction signal of the first field outputted from switch 22, reproduction amplifier 34, reproduction processing circuit 36, switch 1
4.70 to the A/D converter 50 of the adapter 58. The first field video signal digitized by the A/D converter 50 is applied to and stored in the memory 52, and is also applied to the b contact of the switch 54. At this stage, the switch 54 is connected to the b contact, and therefore the output of the Al1) converter 50 remains as it is.
The signal is returned to an analog signal by the /A converter 56, and its output is supplied to the output terminal 44 via the switch 72[deg.]6, the delay circuit 38, the switch 40, and the output amplifier 42. However, at this stage, the switch 40 is switched between the AB contacts at the field period, and the output terminal 44 outputs the skew-compensated reproduced video signal of the first field.

When the first field reproduced video signal has been loaded into the memory 52, the control circuit 68 causes the head moving mechanism 30 to move the magnetic head 24 to the track where the second field video signal is recorded, and the control circuit 68 causes the head moving mechanism 30 to move the magnetic head 24 to the track where the second field video signal is recorded. (
2nd field). In this regeneration phase, the switch 40 is fixedly connected to the b contact, while the switch 5
4 is switched to a and b contacts in the field period. Also, at this time, the contents stored in the memory 52 are not changed.

That is, a signal obtained by digitizing the reproduction signal of the second field is output to the b contact. As a result, a reproduced video signal of the first field is obtained from the memory 52, and a reproduced video signal of the second field is obtained from the magnetic disk 26 (directly from the A/D converter 50).

A backup power supply is provided in the adapter 58, and the image memory
It may also be connected to another playback device or printer as a backup and used as an image source.

[Expensiveness of the invention] As can be easily understood from the above explanation, according to the present invention, it is possible to record or reproduce frames using a field head, and the additional circuit for this can be simple and inexpensive. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. 10. Camera section 12: Imaging signal processing circuit 18: Recording processing circuit 20/Recording amplifier 24: Magnetic head 26
．． Magnetic disk 28, motor 30, head moving mechanism 32, PG coil 34: Reproduction amplifier 36: Reproduction processing circuit 38: 1/2H delay circuit 42: Output amplifier 44: Output terminal 52: Memory 58: Adapter
6o: Adapter detection switch 62: Field/frame selection switch 64.66: Head movement switch
68: Control circuit

Claims (1)

[Claims] An image recording and reproducing apparatus that performs recording on or reproducing from a recording medium using a single magnetic head, is provided with an image memory with a storage capacity for one field, and when recording a frame, the magnetic head performs a second recording on the recording medium. The image memory is used as a buffer until a field video signal can be recorded, and during frame reproduction, it is used as a storage medium for the reproduced video signal of either the first field or the second field. Image recording and playback device.