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Speech codec enhancements utilizing time compression and perceptual coding

Abstract

A method for encoding wideband speech signal employing standardized narrowband speech codecs is presented as well as experimental results concerning detection of tonal spectral components. The speech signal sampled with a higher sampling rate than it is suitable for narrowband coding algorithm is compressed in order to decrease the amount of samples. Next, the time-compressed representation of a signal is encoded using a narrowband speech codec. The time expansion procedure is applied to the speech signal after transmission and decoding in order to restore original time relations. Finally, the wideband speech signal is presented to the user. The method for spectral envelope estimation involving perceptual criteria is described. The algorithms for tonal components detection were evaluated and compared during experiments carried-out.

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Category:
Conference activity
Type:
publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Title of issue:
122nd Audio Engineering Society, Vienna, Austria, 5-8 May 2007, Convention Paper 7004 strony 1 - 14
Language:
English
Publication year:
2007
Bibliographic description:
Kulesza M., Czyżewski A.: Speech codec enhancements utilizing time compression and perceptual coding// 122nd Audio Engineering Society, Vienna, Austria, 5-8 May 2007, Convention Paper 7004/ Vienna: AES, 2007, s.1-14
Verified by:
Gdańsk University of Technology

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