Sound specific modelling and synthesis with a new postfiltering in low bit rate speech coding

Author

De Lamare, Rodrigo C. ; Silva, Lucio M da ; Alcaim, Abraham

Author_Institution

CETUC, PUC-RIO, Rio de Janeiro, Brazil

Volume

3

fYear

2002

fDate

2002

Firstpage

843

Lastpage

846

Abstract

In this paper we investigate the use of fricatives and stops modelling and synthesis techniques with a spectral envelope reconstruction combined with noise reduction postfilter (SERNR) in mixed voiced-unvoiced multiband excitation coders. We perform a comparative analysis amongst a noise excitation approach operating at 1.75 kb/s and a fricatives and stops excitation technique operating at 0.4 kb/s. A novel SERNR postfiltering technique that significantly enhances the decoded speech is proposed and compared with the well-known adaptive spectral enhancement (ASE) filter

Keywords

acoustic noise; linear predictive coding; spectral analysis; speech coding; 0.4 kbit/s; 1.75 kbit/s; SERNR; fricatives; low bit rate speech coding; mixed voiced-unvoiced multiband excitation coders; noise excitation approach; noise reduction postfilter; postfiltering; sound specific modelling; spectral envelope reconstruction; spectral envelope reconstruction and noise reduction; stops; Bit rate; Decoding; Filter bank; Frequency; Internet telephony; Linear predictive coding; Noise reduction; Performance analysis; Speech coding; Speech synthesis;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Conference_Location

Phoenix-Scottsdale, AZ

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010356

Filename

1010356