Automatic head tracking system

Details Automatic head tracking system Automatic head tracking system

G - Physics

11

B

352/30.4

G11B 21/10 (2006.01) G11B 5/588 (2006.01)

Patent

CA 1104714

S01940 AUTOMATIC HEAD TRACKING SYSTEM ABSTRACT OF THE DISCLOSURE In an apparatus for reproducing video or other information signal recorded in a track on magnetic tape or other record medium; a magnetic head or transducer is moved along the track for reproducing the information signals recorded therein while a bi-morph leaf which supports the head receives an electrical drive signal for deflecting the head in a direction transverse to that along the track. A deflection signal is generated in correspondence to the deflection of the head from a rest position by a circuit which includes a stain gauge fixed on the bi-morph leaf. A control circuit for controlling the deflection of the head includes an oscillator providing a dither oscillation signal which, on appli- cation to the bi-morph leaf, cause transverse oscillation of the head about a null position, an elvelope detector detecting the envelope of the reproduced output of the head, a multiplier for synchronously demodulating the detected envelope by means of the deflection signal so as to obtain a tracking error signal accurately representative of the deviation of the null position of the head from the center of the track and an adder adding the tracking error signal -1- to the dither oscillation signal so as provide therefrom the electrical drive signal and by which the null position of the oscillated head is aligned with the center of the track.

303825

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