DocumentCode :
705372
Title :
Multi-band pre-echo control using a filterbank equalizer
Author :
Geiser, Bernd ; Roggendorf, Martin ; Vary, Peter
Author_Institution :
Inst. of Commun. Syst. & Data Process., RWTH Aachen Univ., Aachen, Germany
fYear :
2010
fDate :
23-27 Aug. 2010
Firstpage :
244
Lastpage :
248
Abstract :
We propose a new method to mitigate so called “pre-echo artifacts” that occur with transform-based audio codecs owing to their comparatively large block lengths. Our algorithm operates entirely in the time domain. In contrast to previous time domain approaches, a frequency selective pre-echo control (PEC) is achieved by applying the concept of a filterbank equalizer (FBE) with non-uniform frequency resolution. As an example application, the new PEC approach has been used to enhance the ITU-T G.722.1C super-wideband codec. The performance of the algorithm has been objectively measured and optimized w.r.t. various FBE parameters. Considerable quality gains could be obtained which are confirmed by the subjective listening impression. The proposed algorithm can be easily extended to act as an adaptive spectro-temporal pre- and deemphasis filter.
Keywords :
audio coding; block codes; channel bank filters; echo suppression; time-domain analysis; FBE; FBE parameters; ITU-T G.722.1C super-wideband codec; PEC; adaptive spectro-temporal pre-and-deemphasis filter; block lengths; filter bank equalizer; frequency selective preecho control; multiband preecho control; nonuniform frequency resolution; preecho artifacts; quality gains; subjective listening impression; time-domain analysis; transform-based audio codecs; Bit rate; Codecs; Delays; Discrete Fourier transforms; Equalizers; Stacking; Time-domain analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2010 18th European
Conference_Location :
Aalborg
ISSN :
2219-5491
Type :
conf
Filename :
7096645
Link To Document :
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