Phase servo circuit

Details Phase servo circuit Phase servo circuit

G - Physics

11

B

352/21.1

G11B 21/10 (2006.01) G11B 15/18 (2006.01) G11B 27/024 (2006.01) H04N 5/76 (2006.01)

Patent

CA 1154159

ABSTRACT OF THE DISCLOSURE A phase servo circuit for controlling rotatable magnetic head which is used for recording and/or reproducing a television signal. The servo circuit includes a pulse gene- rator for producing a pulse signal synchronous with rotating phase of said rotatable magnetic head. A circuit is provided for generating a control signal which is used for controlling the rotating phase of said rotatable magnetic head, the control signal having a pulse width modulated in response to phase diffe- rence between the pulse signal and first synchronizing signal of television signal to be recorded. Another circuit is provided for detecting phase difference between the first synchronizing signal and second synchronizing signal of reproduced television signal. The pulse width of the control signal is modulated in response to output of said phase difference detecting circuit. Each phase angle of the first and second synchronizing signals is agreed with each other on a magnetic tape in order to carry out tape edition.

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