In this contribution, a novel two-channel acoustic front-end for robust automatic speech
recognition in adverse acoustic environments with nonstationary interference and
reverberation is proposed. From a MISO system perspective, a statistically optimum source
signal extraction scheme based on the multichannel Wiener filter (MWF) is discussed for
application in noisy and underdetermined scenarios. For free-field and diffuse noise
conditions, this optimum scheme reduces to a Delay & Sum beamformer followed by a …