Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1980-11-12
1983-06-28
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 142, G11B 2702, H04N 578
Patent
active
043909086
ABSTRACT:
A phase servo circuit for controlling a rotatable magnetic head which is used for recording and/or reproducing a television signal includes a pulse generator for producing a pulse signal synchronous with the rotating phase of the rotatable magnetic head, a phase difference detecting circuit for generating a control signal which is used for controlling the rotating phase of the rotatable magnetic head, the control signal having a pulse width modulated in response to the phase difference between the pulse signal and the vertical synchronizing signal of a television signal to be recorded, another circuit for detecting the phase difference between the aforementioned vertical synchronizing signal and a second vertical synchronizing signal of a reproduced television signal and a modulating circuit for modulating the pulse width of the control signal in response to the output of the phase difference detecting circuit, whereby the phase angle of the first-mentioned and second vertical synchronizing signals are in synchronization with each other on a magnetic tape in order to carry out tape editing operation.
REFERENCES:
patent: 3729583 (1973-04-01), Yano
patent: 3849795 (1974-11-01), Koda et al.
patent: 4206485 (1980-06-01), Sakamoto
patent: 4259698 (1981-03-01), Takada
patent: 4306254 (1981-12-01), Koda et al.
patent: 4307417 (1981-12-01), Tokuyama
Nakamura Tadahiko
Nakano Kenji
Tajima Shigeru
Canney Vincent P.
Eslinger Lewis H.
McElheny Jr. Donald
Sinderbrand Alvin
Sony Corporation
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