Problem: Automatic classification of the acoustical situation, and fast prediction of the local signal-to-noise ratio (SNR)

Application: VAD for mobile communication, noise suppression for e.g. hearing instruments

Motivation: Humans can easily detect and classify different sound sources, e.g., distinguish between speech and noise. Which features in the acoustic waveform allow for such impressive skills?

Approach: Modelling neurophysiological findings on amplitude modulation processing in the auditory system of mammals yielding spectro-temporal feature patterns. Classification and SNR prediction with artificial neural networks.

Implementation: Narrow-band SNR estimation fed into Wiener Filter like noise reduction algorithm. No assumption about stationarity of the noise and no speech pause detection necessary.