Back to results
US 4,786,849 AGranted
Offset compensating circuit in fine control servo device
AssigneePioneer Electronic Corporation
InventorKiyoshi Tateishi
Life of this patent
Estimating the term…
Abstract
An offset compensating circuit in a fine control servo. When the servo loop for an error signal is opened, the error signal is sampled and its positive and negative peaks are found. The average of the positive and negative peaks is determined as an offset signal to be subtracted from the error signal when the loop is closed.
Claims3
An offset compensating circuit in a servo device, comprising:
- a servo loop including a source of an error signal and means for processing said error signal;
- means for opening said servo loop;
- peak detecting means for detecting positive and negative peak values p.sub.p and p.sub.n of said error signal with said servo loop kept open;
- means for calculating an offset value by inserting said peak values p.sub.p and p.sub.n in the following expression:
- (p.sub.p +p.sub.n)/2;
- and
- means for subtracting said offset value from a signal level of said error signal only when said servo loop is closed.
4 more elements
Dependencies are inferred from the claim text.