Theoretical Noise Reduction Limits of the Generalized Sidelobe Canceller (GSC) for Speech Enhancement

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Abstract:

In this paper we present an analysis of the generalized sidelobe canceller (GSC). It can be shown that the theoretical limits of the noise reduction performance depend only on the auto- and cross-spectral densities of the input signals. Furthermore, we compute the limits of the noise reduction performance for the theoretically determined diffuse noise ﬁeld, which is an approximation for re-
verberant rooms. Our results will show that the GSC cannot reduce noise further than 1dB. These results were veriﬁed by simulation of reverberant environments. Only in sound-proof rooms with a reverberation time less than 100ms the GSC performs well.

Document type:

Conference Paper

Publication:

Phoenix, Arizona, 15. - 19. March 1999

Conference:

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 99)

Pages:

2965-2968

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