Stored video signals reproduction device - uses disc rotating on air cushion at speed of e.g. 1500 rpm

Signal recorder in a spiral track is red out by an optical system and converted by a photodetector into an electric signal. Two drives are provided, one for the disc and the other, designed as a servomotor, for the scanning system movement. The electric signal passes through an amplifying and coding...

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Bibliographic Details
Main Author KROLL, GUENTER., 2000 HAMBURG
Format Patent
LanguageEnglish
German
Published 28.05.1975
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:Signal recorder in a spiral track is red out by an optical system and converted by a photodetector into an electric signal. Two drives are provided, one for the disc and the other, designed as a servomotor, for the scanning system movement. The electric signal passes through an amplifying and coding stage, and is applied an f.m. demodulator to a stage delivering the video signal and also deriving a synchronisation pulse as reference signal for the servomotor. Signals delivered by the magnetic head system are applied through an additional equaliser-limiter stage to the f.m. demodulator. A colour picture blanking, composite synchronisation signal is available at the output of the first of the signal delivery stages, and the sound signal at the output of the second.
Bibliography:Application Number: DE19732357027