JPS58166888A - Reproducer of electronic film (system) - Google Patents

Abstract

PURPOSE:To reproduce a still picture on a video reproducing screen, by storing temporarily the video signal into a memory after reading and converting it into a digital signal and then reading repetitively the digital signal out of the memory. CONSTITUTION:A floppy disk 1 is turned by one to several times at 1/60sec per revolution or a lower speed, and the FM modulated video signals equivalent to a picture, for example, which are recorded to the disk 1 are read by a reproducing head 2. These video signals are properly amplified and demodulated by a wave detecting circuit 3 whan necessary to obtain video signals, These video signals are amplified 4 and then A/D-converted by an A/D converter to be stored in a memory 6. Then the digital video signal stored in the memory 6 is D/A- converted 7 and then amplified 8. The amplified video signal is furthermore converted into a desired TV signal, e.g., an NTSC signal through a processing circuit 9. At the same time, the video signal is delivered 10 after an AM modulation given by using the frequency of an idle channel of a TV of VHF, etc. to a carrier wave. This output signal is supplied to a video input terminal of the TV. Then a static picture is reproduced on a screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reproducing apparatus for an electronic film system that records and reproduces still images using an electrical recording medium such as a floppy disk.

Currently, CCDs generate video signals according to the image of the subject.
An electronic still camera is equipped with an image pickup device such as the above, and a recording medium that records the video signal from the image pickup device, and reads the video signal recorded on the recording medium to display a still image on an image reproduction screen of a cathode ray tube or the like. An electronic film system consisting of a playback device and a playback device has been realized.

In such a system, a still camera records a video signal for one image per track on a floppy disk, and a playback device continuously rotates this floppy disk at a cycle of, for example, 1/6 degrees. The reproduced image is obtained by repeatedly reading the video signal for one image using the reproducing head. In other words, in conventional electronic film system playback devices, the recording medium in contact with the playback head is continuously rotated at high speed during image playback, so characteristics may deteriorate due to wear of the playback head or recording signals may deteriorate due to wear of the recording medium. There have been problems with the durability of the recording medium and the reproducing apparatus, such as deterioration and damage to various parts of the reproducing apparatus, especially the rotating parts.

In view of the above-mentioned melting point in the conventional type, the present invention provides a reproducing device for an electronic film system that reads the video recording signal of one track or the entire recording medium at least once, and The purpose of this invention is to improve the durability of recording media and reproduction devices based on the concept of storing images in a memory and reproducing images while repeatedly reading out the contents of this memory.

The present invention will be described in detail below using the drawings.

FIG. 1 shows a block configuration of a playback device for an electronic film system according to an embodiment of the present invention. In the figure, 1 is a floppy disk, 2 is a playback head, 6 is a detection circuit, and 4 is a floppy disk.
is an amplification circuit, 5 is an A/D controller, 6 is a memory, 7 is a
is a D/A converter, 8 is an amplification circuit, and 9 is a processing circuit.

Next, the operation of this playback device will be explained. An FM-modulated video signal is recorded on the floppy disk 1 by an electronic still camera (not shown).

The floppy disk 1 is rotated once or several times at an appropriate speed of 1/60 seconds per rotation, which is similar to a conventional endogenous device, or slower than this, and the reproducing head 2 reads, for example, one track recorded on the floppy disk 1, i.e. Read the FM modulated video signal for one image.

This FM modulated video signal is amplified as necessary and then demodulated by a detection circuit 5 to obtain a video signal. Subsequently, this video signal is amplified by an amplifier 4, and then sampled by an A/D converter 5 at a predetermined period, such as a period corresponding to one pixel of an image sensor of a camera or a period at which a desired resolution can be obtained. The data is A/D converted and stored in the memory 6. The effective memory capacity itM [bytes] of this memory 6 and the floppy disk are 1
There is a relationship between the rotation period TF (seconds) and the sampling frequency, that is, the writing pulse frequency fw [Hz] to the memory 6, as follows: M-fw-TF (1).Therefore, the resolution is the effective memo IJ g amount. M
Determined by Furthermore, even when the rotation period of the floppy disk is made slower than 1/60 second, sampling may be performed at the frequency determined by equation (1). Next, the digital video signal stored in this memory B is expressed as TF=
Read by a read pulse with a frequency of 1760, D
/A converter 6 performs D/A conversion, amplifier 8 amplifies the signal,
Furthermore, a processing circuit 9 converts a necessary television signal into, for example, an NTSC signal, and converts it into a VHF signal as necessary.
A using the frequency of an empty TV channel as a carrier wave.
After M modulation, it is output from the output terminal 10. This output signal is input to a video input terminal or antenna terminal of a television (not shown), and a still image is reproduced on the television screen.

As described above, according to the present invention, it is possible to continuously reproduce still images by simply scanning one track by rotating the floppy disk or playback head one or several times, and there is no need to continuously rotate the recording medium at high speed. Therefore, deterioration of recorded signals due to abrasion of the recording medium, etc. can be prevented, and furthermore, abrasion, etc. of the reproducing head and the rotating portion of the reproducing device is reduced, and the durability of the reproducing device is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a playback device for an electronic film system according to an embodiment of the present invention. 1... Floppy disk, 5... A/D converter, 6... Memory, 7... D/A converter. Patent applicant Copal Co., Ltd. Agent Patent attorney Tatsuo Ito and 1 other person

Claims (1)

[Claims] 1. An electronic film system consisting of an electronic still camera that records a video signal corresponding to an image of a subject on an electrical recording medium, and a playback device that reads the video signal from the recording medium and plays a still image on a video playback screen. In this, the playback device includes means for converting the video signal into a digital signal, a memory for storing the digital signal, and a means for converting the digital signal read from the memory into an analog signal, The electronic device is characterized in that the video signal is read at least once, converted into a digital signal, and then stored in the memory, and then the digital signal is repeatedly read out from the memory to reproduce a still image on the video playback screen. Film system playback device.