MIC audio noise filtering
AssigneeFairchild Semiconductor Corporation
InventorsSeth M. Prentice, Shawn Barden
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Abstract
This document discusses, among other things, a MIC audio noise filtering system configured to detect MIC audio noise at a pole of a four-pole audio jack using first and second comparators. The MIC audio noise detection system can include first and second comparators configured to compare a value of the pole to respective first and second thresholds and to provide an output indicative of the comparisons and a detection circuit configured to count changes in the output over a first period of time and to detect MIC audio noise at the pole of the four-pole audio jack using the count.
Claims15
A MIC audio noise filtering circuit, comprising:
- first and second comparators configured to compare a value of a pole of a four-pole audio jack to respective first and second thresholds and to provide an output indicative of the comparisons;
- and
- a detection circuit configured to count a number of changes in the output over a first period of time and to detect MIC audio noise at the pole of the four-pole audio jack using the count.
A MIC audio noise filtering method, comprising:
- comparing a value of a pole of a four-pole audio jack to respective first and second thresholds;
- providing an output indicative of the comparisons;
- counting a number of changes in the output over a first period of time;
- and
- detecting MIC audio noise at the pole of the four-pole audio jack using the count.
Dependencies are inferred from the claim text.