Servo for a rotary head drum of vtr

Details Servo for a rotary head drum of vtr Servo for a rotary head drum of vtr

G - Physics

11

B

352/21.1, 352/21

G11B 15/473 (2006.01) G11B 15/18 (2006.01)

Patent

CA 1329258

ABSTRACT OF THE DISCLOSURE A servo circuit for controlling a rotation of a drum motor to rotate a rotary head drum having a frequency generating circuit for generating a frequency signal corresponding to a revolution speed of a drum motor, a cycle detector circuit for detecting a cycle of the frequency signal from the frequency generating circuit, a detector circuit for detecting a speed deviation between a detected signal from the detector circuit and a reference signal to produce a speed deviation signal, a first circuit for generating a first rotation control signal based on the speed deviation signal, a second circuit for producing a second rotation control signal based on phase difference data obtained by integrating the speed deviation signal and an adder circuit for adding the first and second rotation control signals to produce a rotation control signal which is supplied to the drum motor to stably rotate the rotary head drum.

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