Calibrating a first and a second microphone

摘要

A device for and method of calibrating a microphone, comprising a loudspeaker ( 3 ) for converting a loudspeaker input signal ( 5 ) into sound; a microphone ( 4 ) for converting received sound into a microphone output signal ( 16 ), and calibration means for calibrating an output power of the microphone relative to a desired power level. The calibration means comprise impulse response estimating means ( 7 ) for estimating an acoustic impulse response of the microphone by correlating the microphone output signal ( 6 ) and the loudspeaker input signal ( 5 ) when the microphone ( 4 ) receives the sound from the loudspeaker ( 3 ), whereby the output power of the microphone ( 4 ) is estimated.