performing an echo cancellation process on a voice input signal according to an echo reference signal to obtain an echo cancellation signal;

performing a fast Fourier Transform (FFT) on the echo reference signal to obtain a reference spectrum signal for each frame;

performing the FFT on the echo cancellation signal to obtain a speech spectrum signal for each frame;

using the reference spectrum signal of a current frame and the speech spectrum signal of the current frame to obtain a priori signal-to-noise ratio of the current frame according to a principle of additive noise;

filtering the speech spectrum signal of the current frame by a Wiener filter coefficient of the current frame determined by the priori signal-to-noise ratio of the current frame to obtain a target spectrum signal of each frame; and

performing an inverse fast Fourier Transform (IFFT) on the target spectrum signal of each frame to obtain a target voice signal;

wherein the priori signal-to-noise ratio of the current frame is the ratio of the non-reference spectrum signal in the speech spectrum signal of the current frame to the reference spectrum signal of the current frame.