Joint dereverberation and noise reduction using beamforming and a single-channel speech enhancement scheme
The REVERB challenge provides a common framework for the evaluation of speech enhancement algorithms in the presence of both reverberation and noise. This contribution proposes a system consisting of a commonly used combination of a beamformer with a single-channel speech enhancement scheme aiming at joint dereverberation and noise reduction. First, a minimum variance distortionless response beamformer with an on-line estimated noise coherence matrix is used to suppress the noise and possibly some reflections. The beamformer output is then processed by a single-channel speech enhancement scheme, incorporating temporal cepstrum smoothing which suppresses both reverberation and residual noise. Experimental results show that improvements are particularly significant in conditions with high reverberation times.