Abstract
A method to eliminate echo by using an array microphone and used for an acoustic reception system. The method includes the steps of: using an array microphone to receive an acoustic source to form a plurality of analog audio signals; using an analog to digital converter to convert the analog audio signals to a plurality digital audio signals; using a digital signal processor to divide the digital audio signals into a main audio signal and at least one noise signal through an adaptive beamforming process and a Blocking matrix filtering process; using the digital signal processor to perform a subtraction operation between the noise signal and the main audio signal through a multiple-input canceling process so as to obtain a sound signal with echo suppression. Accordingly, the present invention enables the acoustic reception system to eliminate the error, so that the sound signal has better robustness.