EXAMPLES OF POLYAURAL PROCESSING Richard M. Stern, Evandro Gouvêa Robust Speech Recognition Group Carnegie Mellon University Telephone: (412) 268-2535 Fax: (412) 268-3890 rms@cs.cmu.edu http://www.cs.cmu.edu/~rms Examples from Interspeech 2007 Paper

Some implementation details 11 simulated mics in Flanagan-type logarithmic array Two speakers: One arrives “on axis” (zero delay between sensors) Other arrives with delays of 1, 2, 4, and 8 samples: No reverberation added Polyaural processing: Bandpass filtering followed by nonlinear rectification Cross-correlation with lag at “look direction” Bandpass filtering followed by recombination across frequency

Examples of polyaural processing Brian Stef Individual speakers Combined at zero dB SIR Delay-and-sum beamforming Polyaural separation, no straightness wtg Polyaural separation with straightness wtg