Systems and techniques for microphone array calibration

A method for microphone array calibration, comprising:

• playing a test signal at a loudspeaker;
• generating a plurality of microphone array signals at a microphone array based on a first sampling of the test signal at the microphone array;
• generating a reference signal at a reference microphone based on a second sampling of the test signal at the reference microphone, wherein the reference microphone is separate from the microphone array and is positioned between the loudspeaker and the microphone array;
• generating a set of filter coefficients based on the plurality of microphone array signals and the reference signal;
• and
• transmitting the set of filter coefficients to the microphone array.

A self-calibrating microphone system, comprising:

• a microphone module including:
• a microphone configured to receive an audio input signal and further configured to output a raw microphone output signal, wherein the microphone is pre-calibrated using a calibration transfer function that is based on a frequency domain signal for the microphone;
• and
• a non-volatile memory configured to store microphone calibration coefficients for the microphone, wherein the microphone calibration coefficients are based on the calibration transfer function;
• a processor configured to receive the raw microphone output signal and the microphone calibration coefficients, and further configured to generate a calibrated microphone signal;
• and
• a microphone signal sink configured to receive the calibrated microphone signal from the processor and further configured to output the calibrated microphone signal.