Eric R Bauer

US Patent:

20150086043, Mar 26, 2015

Filed:

Sep 25, 2014

Appl. No.:

14/496678

Inventors:

- Stuttgart, DE
Eric Bauer - San Jose CA, US
Mikko Suvanto - Pittsburgh PA, US

International Classification:

H04R 3/00

US Classification:

381111

Abstract:

An adjustable microphone. The microphone includes a MEMS microphone, a charge pump, a preamplifier, a first analog-to-digital converter, a root mean square (RMS) power detector, and a logic circuit. The MEMS microphone is configured to provide a signal indicative of sound detected by the MEMS microphone. The charge pump provides a bias voltage to the MEMS microphone. The preamplifier receives the signal from the MEMS microphone, and outputs an amplified signal indicative of sound detected by the MEMS microphone. The first analog-to-digital converter receives the amplified signal and converts the amplified signal to a digital signal. The root mean square power detector is configured to detect a power level of the amplified signal and output an indication of the power of the amplified signal. The logic circuit receives the RMS power detector output and a control input, and adjusts the operation of the microphone based on the control input.