Gain adjustment of the microphone array device and method

An apparatus and method is disclosed for adjusting a gain difference between the microphone contained in the microphone array. Gain control apparatus calculates a weight to adjust so that the amplitude of the plurality of sound signals coincide with each other while maintaining the phase of a plurality of acoustic signals converted to signals in the frequency domain for each frequency component of the plurality of sound signals. Then, the gain adjusting unit adjusts the amplitude of the plurality of sound signals by using the calculated weights. A gain adjustment unit in real time and calculates a weight to adjust the gain of the microphone in real time. A microphone array, the gain calibration, signal processing, phase, amplitude