An Additive Equalizer for GSC Beamformer

In almost speech processing and applications, an important factor is enhancing the speech quality, causes the observed signal has been degraded by unwanted interference and additive noise. So speech enhancement is an essential topic, which has many unresolved problems about speech distortion, noise reduction. Microphone array, that use a priori information of distributed microphone to obtain an spatial advantage for further signal processing. The location of target speaker can be easily determined, and the direction of arrival of interesting signal plays a major role in GSC beamformer. GSC beamformer allows concerning beampattern at a certain direction, and attenuating surrounding background noise by using an adaptive noise cancellation (ANC). However, causes unwanted interferences and surrounding noise or other efforts affect on performance of GSC beamformer, so at the output still exist speech distortion. In this article, the author proposed an additional equalizer for reducing speech leakage, which received at the reference signal, for increasing speech quality at the output’s beamformer. The experiments has proven the effectiveness of suggested method, and the signal-to-noise ratio (SNR) increased from 12.8(dB) to 22.6(dB).