Microphone signal compensation apparatus and method thereof

A microphone array comprising a signal compensation apparatus, the signal compensation apparatus comprising:

• a plurality of audio input units to respectively receive a target signal, each audio input unit of the plurality of audio input units comprising a microphone;
• a constant filter unit to selectively apply a constant filtering calibration scheme to signals output by the plurality of audio input units to compensate for a difference in at least one characteristic among the audio input units, the constant filtering calibration scheme being estimated from an average value of a ratio of a desired signal to a reference signal among the signals output by the plurality of audio input units;
• and
• a noise remover unit to remove noise from the signals processed by the constant filter unit.

A microphone signal compensation method, comprising:

• outputting, by a plurality of audio input units to respectively receive a target signal, a plurality of signals, each audio input unit of the plurality of audio input units comprising a microphone;
• selectively applying a constant filtering calibration scheme to the signals output by the plurality of audio input units to compensate for a difference in at least one characteristic among the audio input units, the constant filtering calibration scheme being estimated from an average value of a ratio of a desired signal to a reference signal among the plurality of signals output by the plurality of audio input units;
• and
• removing noise from the signals to which the constant filtering calibration scheme has been applied.