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Noise Suppression Employing Short Delay Processing
Responsible organisation
1999 (English)Conference paper, (Refereed) Published
Abstract [en]

Many telecommunication systems allow only a short delay in the terminal. This restriction stems from the fact that a delay will disturb the conversation. Therefore only a short delay is permissible in noise reduction processing. The well-known spectral subtraction method has been modified to introduce only a short delay and a variance reduced gain function. This modification is accomplished by viewing the spectral subtraction as an FFT filter design method which designs a time-varying filter for each block of data. The design will, however, only give the amplitude function, thus in order to obtain a causal filter a phase must be imposed. The spectral subtraction will not provide any phase information hence a minimum phase is imposed on the filter. The designed filter is transformed to the time-domain and the actual noise reduction filtering will be performed in the time-domain with only a short delay. The proposed method reduces the noise by 10 dB with a maximum processing delay of 7 samples.

Place, publisher, year, edition, pages
Phuket, Thailand: King Mongkuts Inst. Technol , 1999.
Keyword [en]
acoustic signal processing, delays, fast Fourier transforms, filtering theory, noise abatement, spectral analysis, time-domain analysis, time-varying filters
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-10062Local ID: oai:bth.se:forskinfo4A54F81E5DB4F2B0C1256C6E003EF4C0ISBN: 974-622-612-6 (print)OAI: oai:DiVA.org:bth-10062DiVA: diva2:838078
Conference
Proceedings of the International Workshop on Intelligent Signal Processing and Communication Systems - ISPACS'99
Available from: 2012-09-18 Created: 2002-11-11 Last updated: 2015-06-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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