Method of playing back video records through television receiver

Details Method of playing back video records through television receiver Method of playing back video records through television receiver

1977-08-08

1979-04-03

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record editing

358140, 360 35, 360 73, H04N 502, G11B 1928

Patent

active

041480775

ABSTRACT:
A video disk recording made in accordance with U.S. television standards, namely a line scanning frequency of 15,734 HZ and a field scanning frequency of 30 HZ is played back through a pick-up feeding a television receiver operating at the European standard line scanning frequency of 15,625 HZ provided with a switch that has changed over the vertical scanning frequency to the 30 HZ U.S. standard field scanning frequency. In order for the playback system to work with the European line scanning frequency, the record drive is timed to operate at the proportionately low speed and the speed is held to the timing pulses produced by an oscillator by feeding back the picked up synchronizing signals and comparing them with the oscillator timing pulses in a phase detector that controls the speed adjustment of the playback motor.

REFERENCES:
patent: 3676585 (1972-07-01), Kaneko et al.
patent: 3959819 (1976-05-01), Kubo

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