Digital servo circuit

Details Digital servo circuit Digital servo circuit

1979-01-11

1981-03-03

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318341, 318608, H02P 516

Patent

active

042543673

ABSTRACT:
A digital servo circuit which, for example, may be used in a video tape recorder, for controlling the velocity and the phase of movement of a video tape by a capstan which is driven by an electric motor. The circuit includes a frequency generator for generating a pulse signal having a repetition rate that varies in accordance with the velocity of the capstan, and hence of the tape driven thereby an n-bit presettable counter for counting a reference clock signal during an interval corresponding to the repetition rate of the pulse signal, a latch circuit for latching the least significant m output bits of the counter (where m is less than n), a control circuit for controlling the m-bit output from the latch circuit so as substantially to hold the latter output at the minimum level when the n-bit output from the counter is less than a first predetermined value, and at the maximum level when the n-bit output from the counter is more than a second predetermined value, and a digital-to-analog converter for converting the m-bit output from the latch circuit to the corresponding analog signal to drive the motor.

REFERENCES:
patent: 3836756 (1974-09-01), Yammoto et al.

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