The Grass Valley Group, Inc.

Stephen D Mariuz

Eric Foasberg

An analog-to-digital converter with an offset reduction loop detects the presence/absence of an analog input signal having a zero mean value. The analog input signal is converted to a digital signal by the analog-to-digital converter. The least significant bits of the digital signal are compared with a decision threshold to generate an indicator signal representing the presence/absence of the analog input signal. Arbitrary d.c. offsets in the digital signal are compensated by generating a d.c. offset compensation signal from the most significant bit of the digital signal with respect to a mid-logic reference voltage. The d.c. offset compensation signal is added to the analog input signal prior to conversion to the digital signal.

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Grass Valley, CA, United States of America

Stephen D Mariuz