2004 (English)In: 2004 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, VOL I, PROCEEDINGS: SPEECH PROCESSING, NEW YORK: IEEE , 2004, 457-460 p.Conference paper (Refereed)
This paper introduces a modification of the commonly used postfilter that improves performance when acoustic background noise is present. The modification consists of replacing the nonadaptive postfilter parameters that govern the degree of spectral emphasis (commonly denoted as gamma(1) and gamma(2)) with parameters that adapt to the noise statistics. We describe an effective mapping from the noise statistics to the emphasis parameters and provide a low complexity noise estimation algorithm that is sufficient for this application. The resulting noise-adaptive postfilter successfully attenuates the background noise and naturally converges to the conventional postfilter at high SNR conditions. Thus, the speech enhancement problem is solved with minimal modification of legacy codecs, since the existing structure of the speech codec is used. Test results indicate that the presented algorithm significantly outperforms the standard postfilter with non-adaptive parameters.
Place, publisher, year, edition, pages
NEW YORK: IEEE , 2004. 457-460 p.
Acoustics, Algorithms, Estimation, Mathematical models, Signal to noise ratio, Spectrum analysis, Statistical methods
Computer and Information Science
IdentifiersURN: urn:nbn:se:kth:diva-44754ISI: 000222173500115ScopusID: 2-s2.0-4544259344ISBN: 0-7803-8484-9OAI: oai:DiVA.org:kth-44754DiVA: diva2:451405
IEEE International Conference on Acoustics, Speech, and Signal Processing Location: Montreal, CANADA Date: MAY 17-21, 2004
QC 201110252011-10-252011-10-252014-12-11Bibliographically approved