Eliminating signal quality deteriorations in a reproduced still

Details Eliminating signal quality deteriorations in a reproduced still Eliminating signal quality deteriorations in a reproduced still

1991-09-16

1993-04-06

Smezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record editing

360 351, 360 18, 360 27, 358312, H04N 578

Patent

active

052008622

ABSTRACT:
A device capable of reproducing recording information without error and which eliminates a deterioration in a reproduced image quality during a dubbing operation. The still image reproducing device has a change-over switch that is capable of selectively delivering a demodulated image signal obtained through delaying an image signal by a time corresponding to 0.5 H. A control circuit outputs a switching control signal upon completion of one full rotation of a recording medium. A decoder decodes the demodulated recording information in response to a decoder control circuit, enabling the decoder to operate when the change-over switch is delivering the demodulated composite image signal. In the still image recording device, the composite image signal is FM demodulated. The demodulated composite image signal is multiplexed with a signal obtained by encoding and modulating the recording information. The multiplexed signal is supplied to a recording head through the gate circuit. When the recording trigger signal is received, the gate circuit is opened if the decoder is not supplied with the enable signal at the moment when the rotation pulse is received. When the next rotation pulse is received, the gate circuit is closed if the enable signal is being received by the decoder.

REFERENCES:
patent: 4058840 (1977-11-01), Hasparzak
patent: 4298896 (1981-11-01), Heitmann
patent: 4647987 (1987-03-01), Nutting
patent: 4849832 (1989-07-01), Yamagoto
English abstract of Japanese Unexamined Patent Publication No. 62-112483, May 23, 1987 Arakawa.

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