As an effective technique for suppressing coherent noise, adaptive beamforming shows a strong decrease in reverberant rooms due to multipath room reflections of received signals. In this paper a dual-channel beamformer based on noise coherence and frequency domain filter is proposed. First, hybrid coherence based on coherent-to-diffuse energy ratio (CDR) is introduced to approximate the coherence of noise signals. Then the hybrid coherence is used to estimate the noise power spectral density (PSD), which is applied to the frequency domain filter to reduce noise and reverberation components in microphone signals. Finally, outputs of the filter are processed by a beamformer to suppress residual noise. Experiments demonstrate that the proposed system has noticeable improvements in SNR and quality of the output in reverberant environments.
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