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

de Lamare, R.C. ; da Silva, L.M. ; Alcaim, A.

2002 IEEE International Symposium on Circuits and Systems (ISCAS), 2002, Vol.3, p.III-III

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Título:
Sound specific modelling and synthesis with a new postfiltering in low bit rate speech coding
Autor: de Lamare, R.C. ; da Silva, L.M. ; Alcaim, A.
Assuntos: Bit rate ; Decoding ; Filter bank ; Frequency ; Internet telephony ; Linear predictive coding ; Noise reduction ; Performance analysis ; Speech coding ; Speech synthesis
É parte de: 2002 IEEE International Symposium on Circuits and Systems (ISCAS), 2002, Vol.3, p.III-III
Descrição: 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.
Editor: IEEE
Idioma: Inglês

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