Article details

Research area
Speech enhancement

Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on


Timo Matheja, Markus Buck, Tobias Wolff

Enhanced speaker activity detection for distributed microphones by exploitation of signal power ratio patterns


In cars with integrated distributed microphone systems usually each speaker has a dedicated microphone. An often required broadband speaker activity detection can be performed by simply evaluating the power ratios among the microphones but transient interferes like indicator noise, outside crossing cars or speech from interfering speakers may be wrongly assigned to one speaker’s activity. In this contribution a new method is presented that exploits patterns based on the characteristics of signal power inverted sub-bands at which compared to the closest microphone higher energy occurs in a distant one. By determination of a distance measure the currently observed pattern of these power inverted sub-bands is compared to online learned speaker position dependent reference patterns. During noise only periods as well as during transient interfering signals the patterns do not match the ref­erence and false speaker activity detections can be reduced.

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