Apparatus for producing a phase-synchronized reference signal in

Details Apparatus for producing a phase-synchronized reference signal in Apparatus for producing a phase-synchronized reference signal in

1980-07-08

1982-08-03

Konick, Bernard

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 64, 360 10, H04N 5795

Patent

active

043430228

ABSTRACT:
Apparatus is disclosed for use in a video signal reproducing system of the type having first and second rotary reproducing transducers for reproducing video and vertical synchronizing signals from record tracks on a record medium, in which the transducers exhibit a predetermined angular separation therebetween, the video signal reproducing system also having means for producing a reference synchronizing signal in phase synchronism with the vertical synchronizing signal reproduced by the first transducer. The apparatus is adapted to produce a substantially phase synchronized reference signal regardless of the particular transducer which is used to reproduce the video signals. The apparatus comprises a delay circuit for delaying the reference synchronizing signal by an amount corresponding to the predetermined angular separation between the transducers; and a switching circuit supplied with this delayed as well as the undelayed reference synchronizing signal. A switch control circuit supplies a switch control signal to the switching circuit to determine whether the delayed or undelayed reference synchronizing signal should be selected, the switch control circuit including a detector for detecting the phase relationship between the vertical synchronizing signal which then is being reproduced and the reference synchronizing signal.

REFERENCES:
patent: 4178607 (1979-12-01), Mikado
patent: 4203076 (1980-05-01), Yamashita
patent: 4257073 (1981-03-01), Tatami
patent: 4259698 (1981-03-01), Takada

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