Offset compensating circuit

Details Offset compensating circuit Offset compensating circuit

1977-02-09

1978-06-27

Smith, Jerry

Communications: electrical

Audible indication

Percussion-type sound producer

307359, 328165, 364571, H03K 1302, H03K 1332

Patent

active

040978605

ABSTRACT:
Method and apparatus for cancelling a deviation in an input signal due to drift, line or background noise, changes in circuit component characteristics due to aging, and the like wherein the input signal, typically a digitized representation of an analog signal, is altered by a presumed offset magnitude; the polarity of the difference is monitored and a negative or positive count of clock pulses is accumulated dependent upon the aforesaid polarity. When a determined positive (or negative) count is reached the presumed offset is adjusted (up or down) by a predetermined increment and the count is begun anew.
As an alternative technique and embodiment the initiation of the count may be restrained as long as the magnitude of the digitized input signal exceeds a predetermined threshold.

REFERENCES:
patent: 3533098 (1970-10-01), Munoz
patent: 3824588 (1974-07-01), Vermillion
patent: 3958236 (1976-05-01), Kelly

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