Space-Time Signals -- Optimum Linear Filtering -- Optimum Beamforming for Wideband Non-Stationary Signals -- A Practical Audio Acquisition System Using a Robust GSC (RGSC) -- Beamforming Combined with Multi-Channel Acoustic Echo Cancellation -- Efficient Real-time Realization of an Acoustic Human/Machine Front-End -- Summary and Conclusions -- A Estimation of Signal-to-Interference-plus-Noise R…