Cascaded dynamic noise reduction utilizing VAD to improve residual suppression

Theodoros Petsatodis, Christos Boukis, Fotios Talantzis, Lazaros Polymenakos

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Abstract

Speech processing systems often operate in noisy and reverberant environments. Their operation is subject to the accuracy of the underlying noise reduction algorithm, that aims to reduce noise present in the signals that are captured by the employed microphones. Under adverse conditions a noise reduction scheme, failing to perform adequately, will produce results characterised by speech distortions (metallic or clipping voice) and/or fluctuating residual background noises, the result of inaccuracy in estimating the noise spectrum, known as musical noise. In this paper, performance enhancement when employing a statistical model based Voice Activity Detector (VAD) in combination with noise reduction, is presented in terms of residual noise suppression within silence intervals and short pauses during speech production. To this end, an efficient noise reduction architecture has been developed relying on cascading a previously presented presented denoising scheme. This way, we initially subtract primary noise and then consequently use the same technique, with specific parameter adjustments, to remove spectral subtraction artefacts such as musical noise or noise leftovers that were generated by the first stage. Simulations under various noise types and intensities indicate significant performance enhancement when employing the proposed system.

OriginalsprogEngelsk
Titel2013 18th International Conference on Digital Signal Processing, DSP 2013
Antal sider6
ForlagIEEE Press
Publikationsdato6 dec. 2013
Sider1-6
Artikelnummer6622696
ISBN (Trykt)978-146735805-7
DOI
StatusUdgivet - 6 dec. 2013
BegivenhedInternational conference on Digital Signal Processing - Fira, Grækenland
Varighed: 1 jul. 20133 jul. 2013
Konferencens nummer: 18
http://dsp2013.dspconferences.org/

Konference

KonferenceInternational conference on Digital Signal Processing
Nummer18
Land/OmrådeGrækenland
ByFira
Periode01/07/201303/07/2013
Internetadresse
NavnInternational Conference on Digital Signal Processing proceedings
ISSN1546-1874

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