US9419640B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9419640-B2 |
| Application number | US-201113580153-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 16, 2011 |
| Priority date | Mar 17, 2010 |
| Publication date | Aug 16, 2016 |
| Grant date | Aug 16, 2016 |
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Official abstract text for this publication.
A microphone circuit has a clip detection circuit ( 30 ) which detects when an analog to digital converter (ADC, 12 ) output has reached a threshold. A variable capacitance ( 34 a, 34 b, 34 c, 34 d ), which functions as a variable input load associated with the microphone ( 11 ), is controlled based on the clip detection circuit output, the feedback is thus based on the ADC output level, and the processing of this signal can be implemented without requiring baseband processing of the signal—it can simply be based on a state of the ADC output.
Opening claim text (preview).
The invention claimed is: 1. A microphone circuit comprising: a microphone; an analogue to digital converter at an output of the microphone, the analogue to digital converter including a sigma delta converter configured to generate a pulse density modulation output; a clip detection circuit for detecting when the pulse density modulation output of the analogue to digital converter has reached a threshold, the clip detection circuit configured to generate an output in response…
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Electricity · mapped topic
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