Title :
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
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;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010356
