Abstract
The audio signal-to-electrical signal converter includes one microphone array comprising several microphones with different central resonant frequency and different amplification factor. Each microphone includes one first audio receiving unit, one second audio receiving unit, and one differential amplifier, and the output signal of the first audio receiving unit and that of the second audio receiving unit are substrated in the differential amplifier to produce one output electrical signal with preset central resonant frequency value. The microphones in the microphone array may be connected selectively with one switch unit.