Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1991-08-28
1994-03-29
Sikes, William L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 91, 348441, G11B 1552, H04N 578, H04N 701
Patent
active
052990737
ABSTRACT:
Video tape recorder speed control apparatus for controlling a video tape recorder (1) to cause it to reproduce a recorded video signal at a predetermined speed, such as a fraction 1
of the normal speed, the apparatus comprising the video tape recorder (1), first and second counters (25,26), the first and second counters (25, 26) being incremented by a signal locked in frequency to the field repetition frequency of the video signal at the normal playback speed thereof, the first counter (25) resetting periodically at intervals determined by the predetermined speed, the second counter (26) being reset with a signal locked in frequency to the field repetition frequency of the video signal being reproduced by the video tape recorder (1), a comparator (27) for periodically comparing the counts of the first and second counters (25, 26) thereby to derive a phase error signal, and a control signal generator (28, 29, 30) to derive in dependence on the phase error signal a signal to control the reproduction speed of the video tape recorder (1).
REFERENCES:
patent: 3686469 (1972-08-01), Clark et al.
patent: 4550349 (1985-10-01), Okuyama et al.
patent: 4780774 (1988-10-01), Edakubo et al.
patent: 4866520 (1989-09-01), Nomura et al.
IEEE Transactions on Consumer Electronics vol. CE-25, No. 1, Feb. 1979, New York US pp. 45-48 Yukihiko Machida `Simplified television standards converter as a video tape reproduction system` p. 46, right col., line 14-p. 47, right col., line 8.
Dorricott Martin R.
Richards John W.
Frommer William S.
Phan Trong
Sikes William L.
Sinderbrand Alvin
Sony United Kingdom Ltd.
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