Dynamic magnetic information storage or retrieval – Record editing
Patent
1982-06-17
1985-07-23
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Record editing
360 70, H04N 578, G11B 2104
Patent
active
045311625
ABSTRACT:
A video signal slow-motion or still picture reproduction system comprises at least one rotary video head for scanning a tape recorded with an FM video signal on tracks formed obliquely with respect to the longitudinal direction of the tape, a drum pulse obtaining circuit for obtaining a drum pulse in phase synchronism with the rotation of the rotary video head, a counting pulse generation circuit for generating a counting pulse in phase synchronism with the rotation of said rotary video head and having a repetition frequency sufficiently high with respect to the drum pulse, a noise detection pulse generation circuit for generating a noise detection pulse having a pulse width equal to a period in which an envelope of the FM video signal reproduced by the reproducing circuit is lower than a predetermined level, when the envelope of the FM video signal reproduced by the reproducing circuit is lower than the predetermined level, a calculation circuit supplied with the drum pulse, the counting pulse, and the noise detection pulse, for calculating an error between a point corresponding to a vertical blanking period of the reproduced FM video signal and a noise position within the reproduced FM video signal, and a circuit for driving the tape with a timing according to the calculated error obtained by the calculation circuit, and stopping the tape travel with a timing according to a value obtained by multiplying a coefficient to the error so that the noise position is within the vertical blanking period, to cause intermittent tape travel and to stop the tape travel.
REFERENCES:
patent: 4276571 (1981-06-01), Sakamoto
patent: 4306255 (1981-12-01), Misaki et al.
"Microprocessor Controlled Variable Play-Back Speed System for Video Tape Recorder", Azuma et al., IEEE Trans. Cons. Elec., vol. CE-26, No. 1, Feb. 1980, pp. 121-128.
Bernat Louis
Psitos Aristotelis M.
Victor Company of Japan Ltd.
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