ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

3pSP4. Modeling the separation of acoustical signals based on the simulation of spike firing patterns.

Kyrill A. Fischer

Drittes Physikalisches Inst., Univ. of Gottingen, Burgerstrasse 42-44, D-37073 Gottingen, Germany

It is investigated to what extent the separation of overlapping acoustical sounds may be achieved by detecting and grouping comodulated frequency bands. Comodulation is defined by coherent envelope fluctuations which are detected by means of physiological motivated algorithms involving spike representation and coincidence detection. Groups of comodulated frequency bands are defined by cluster analysis and their temporal variations are traced. Every group detected can then be separated from its ``acoustical background'' by suppressing all channels not belonging to the given group. The paper addresses problems concerning the definition of suppression gain values and the problem of overlapping groups.