Title :
The effects of non-stationary signal characteristics on the performance of adaptive audio restoration systems
Author :
Vaseghi, Saeed V. ; Rayner, Peter J W
Author_Institution :
Dept. of Eng., Cambridge Univ., UK
Abstract :
The degrading effects of nonstationary and abruptly changing signal characteristics on the performance of a particular class of restoration systems, namely those which use two sources of information, are discussed. The system considered is the adaptive noise suppression system. In this system abrupt changes in signal statistics result in transient degradations in the form of excessive suppression of some signal frequency components and or inadequate suppression of noise frequency components. Abrupt changes are detected using an appropriate distance between two autoregressive models of the signal. After detection of an abrupt change the adaptation gain is increased and/or the filter parameters are reinitialized in order to minimize the degradation
Keywords :
acoustic signal processing; audio signals; interference suppression; speech analysis and processing; abruptly changing signal characteristics; adaptation gain; adaptive audio restoration systems; adaptive noise suppression system; autoregressive models; filter parameters; nonstationary signal characteristics; speech signals; transient degradations; Degradation; Delay effects; Filters; Frequency; Least squares approximation; Signal analysis; Signal processing; Signal restoration; Signal to noise ratio; Statistics;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266444
