On the effect of the language in CMS channel normalization

Dirceu Gonzaga da Silva, José A. Apolinário Jr., Charles B. de Lima

DOI: 10.14209/its.2002.829

Evento: 2002 International Telecommunications Symposium (ITS2002)

Keywords:

Abstract

"This paper presents a modification in a technique of channel normalization widely known as Cepstral Mean Subtraction (CMS). This modification is based on the introduction of language dependent phonetic modification. A careful investigation using Brazilian Portuguese was carried out showing that it is possible to improve the CMS channel identification through a constant vector, associated with the language, obtained from an estimation of the mean cepstral coefficients from clean speech signal over time. As a consequence of better channel estimation, better features normalization is attained. Computer simulations were carried out with cepstral coefficients extracted from Mel-scale in a speaker identification experiment where the proposed technique, in some cases, improved the recognition rate on the top of the CMS good results."

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