Generalized postfilter for speech quality enhancement
2008 (English)In: IEEE Transactions on Audio, Speech and Language Processing, ISSN 1558-7916, Vol. 16, no 1, 57-64 p.Article in journal (Refereed) Published
Postfilters are commonly used in speech coding for the attenuation of quantization noise. In the presence of acoustic background noise or distortion due to tandeming operations, the postfilter parameters are not adjusted and the performance is, therefore, not optimal. We propose a modification that consists of replacing the nonadaptive postfilter parameters with parameters that adapt to variations in spectral flatness, obtained from the noisy speech. This generalization of the postfiltering concept can handle a larger range of noise conditions, but has the same computational complexity and memory requirements as the conventional postfilter. Test results indicate that the presented algorithm improves on the standard postfilter, as well as on the combination of a noise attenuation preprocessor and the conventional postfilter.
Place, publisher, year, edition, pages
2008. Vol. 16, no 1, 57-64 p.
Additive noise; Distortion measure; Multiplicative noise; Noise reduction; Perceptually optimal processing; Postfilter; Speech coding; Speech enhancement; Tandeming
IdentifiersURN: urn:nbn:se:kth:diva-5947DOI: 10.1109/TASL.2007.909327ISI: 000251947000006ScopusID: 2-s2.0-64849092071OAI: oai:DiVA.org:kth-5947DiVA: diva2:10489
QC 201008242006-06-022006-06-022011-08-25Bibliographically approved