Digital control of servo circuit
AssigneeIomega Corporation
InventorDavid T. Cornaby
Life of this patent
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Abstract
Digital signal processing means useful in control of servo loops is disclosed. The servo loop is designed to interface with a microprocessor controlling the loop. In a preferred embodiment, in which the servo loop controls the motion of a read/write head with respect to a magnetic disk, plural previous control signals and output response signals are recursively summed to generate each next position signal. Coefficients for weighting the previous control and response signals are stored in a read only memory accessed by portions of the control and response signals.
Claims5
Servo apparatus comprising means for comparing a detected position signal to a command position signal, means for updating said command signal based on the result of said comparison means for recursive summation of plural previous command signals and previous detected position signals to yield a next command signal, memory means for storing coefficients, and means for weighting said previous command and/or detected position signals in said summing step in accordance with said coefficients stored in said memory means.
Method of calculating a control input to a servo loop, comprising the steps of inputting a series of control signals to said loop;
- generating the next succeeding control signals in accordance with the output response signals resulting from application of the previous control signals;
- recursively summing a plurality of previous control signals and of output response signals to generate each next control signal;
- retrieving coefficients from memory means;
- and
- weighting said previous control signals and detected output signals in accordance with said coefficients in said recursive summing operation.
Dependencies are inferred from the claim text.