Patent ID: 9451358
Filing Date: 2016-09-20
CPC Classification: H04R

Claim Text:
1. An adjustable microphone, the microphone comprising: a MEMS microphone configured to provide a signal indicative of sound detected by the MEMS microphone; a charge pump coupled to the MEMS microphone and providing a bias voltage to the MEMS microphone; a preamplifier coupled to the MEMS microphone and receiving the signal from the MEMS microphone, the preamplifier outputting an amplified signal indicative of sound detected by the MEMS microphone; a first analog-to-digital converter (ADC) receiving the amplified signal and converting the amplified signal to a digital signal; a root mean square (RMS) power detector configured to detect a power level of the amplified signal and output an indication of the power of the amplified signal; and a logic circuit receiving the RMS power detector output and a control input, the logic circuit adjusting the operation of the microphone based on the control input; wherein the logic circuit adjusts an amplification of the preamplifier based on the control input and the RMS power detector output.