Joint enhancement and coding of speech by incorporating Wiener filtering in a CELP codec

Johannes Fischer, Tom Bäckström

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

The performance of speech communication applications in the field of mobile devices is often hampered by background noises and distortions. Therefore, noise attenuation methods are commonly used as a pre-processing method, cascaded with the speech-codec. We demonstrate that the performance of such combinations of speech enhancement and coding methods can be improved by joining the two methods into a single block. The proposed method is based on incorporating Wiener filtering into the objective function used for optimization of the quantization in code excited linear prediction (CELP)-based codecs. The benefits are that 1) the non-linear components of CELP codecs, including quantization and error feedback, are taken into account in the joint minimization function thereby improving quality and 2) by merging blocks both delay and computational complexity can be minimized. Our experiments demonstrate that the proposed joint enhancement and coding approach consistently improves subjective and objective quality. The proposed method is compatible with any CELP-based codecs without changing the bit-stream, whereby it can be readily applied in mobile phones or speech communication devices applying the concepts of CELP codecs for improving perceptual quality in adverse conditions.

Original languageEnglish
Title of host publicationProceedings of the Annual Conference of the International Speech Communication Association
PublisherInternational Speech Communication Association
Pages1730-1734
Number of pages5
Volume08-12-September-2016
DOIs
Publication statusPublished - 1 Jan 2016
MoE publication typeA4 Article in a conference publication
EventInterspeech - San Francisco, United States
Duration: 8 Sep 201612 Sep 2016
Conference number: 17

Publication series

NameProceedings of the Annual Conference of the International Speech Communication Association, INTERSPEECH
PublisherInternational Speech Communication Association
ISSN (Print)2308-457X

Conference

ConferenceInterspeech
CountryUnited States
CitySan Francisco
Period08/09/201612/09/2016

Keywords

  • Code-excited linear prediction
  • Speech coding
  • Speech enhancement
  • Wiener filtering

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