Microphone array and the microphone array establishing method

A microphone array and a microphone array establishing method are provided. The microphone array is disposed on an electrical device, and includes: at least one built-in microphone, being built in the electrical device, having a first frequency spectrum; and an audio processor, coupled to the built-in microphone, for coupling to an external transducer, including: a spectrum estimation unit for estimating a second frequency spectrum of the external transducer.