Hybrid servo control system

Details Hybrid servo control system Hybrid servo control system

1973-12-06

1977-01-18

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318329, 360 70, 360 75, G05B 102, G05B 2102

Patent

active

040042057

ABSTRACT:
A hybrid servo control system for controlling, for example a rotation of a capstan driving motor or a head motor of a video tape recorder comprises at least an integral control loop including an analog phase comparator for detecting in an analog mode a phase difference between a signal related to the rotation of the capstan driving motor or the head motor to be controlled and a reference signal so as to produce an analog amount corresponding to said phase difference, an analog-digital converter for converting said analog amount into a digital amount and a digital frequency modulator for frequency modulating in a digital mode clock pulses with said digital amount.

REFERENCES:
patent: 3758710 (1973-09-01), Crosno
patent: 3836756 (1974-09-01), Yamamoto et al.

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