Determination of instants of significant excitation in speech using group delay function

Author

Smits, Roel ; Yegnanarayana, B.

Author_Institution

Inst. for Peception Res., Eindhoven, Netherlands

Volume

3

Issue

5

fYear

1995

fDate

9/1/1995 12:00:00 AM

Firstpage

325

Lastpage

333

Abstract

A new method for determining the instants of significant excitation in speech signals is proposed. In the paper, significant excitation refers primarily to the instant of glottal closure within a pitch period in voiced speech. The method is based on the global phase characteristics of minimum phase signals. The average slope of the unwrapped phase of the short-time Fourier transform of linear prediction residual is calculated as a function of time. Instants where the phase slope function makes a positive zero-crossing are identified as significant excitations. The method is discussed in a source-filter context of speech production. The method is not sensitive to the characteristics of the filter. The influence of the type, length, and position of the analysis window is discussed. The method works well for all types of voiced speech in male as well as female speech but, in all cases, under noise-free conditions only

Keywords

Fourier transforms; filtering theory; prediction theory; speech processing; analysis window; female speech; global phase characteristics; glottal closure; group delay function; linear prediction residual; male speech; minimum phase signals; noise-free conditions; phase slope function; pitch period; positive zero-crossing; short-time Fourier transform; significant excitation instants; source-filter; speech production; unwrapped phase; voiced speech; Computer science; Delay; Educational institutions; Filters; Fourier transforms; Information analysis; Region 2; Signal analysis; Speech analysis; Speech synthesis;

fLanguage

English

Journal_Title

Speech and Audio Processing, IEEE Transactions on

Publisher

ieee

ISSN

1063-6676

Type

jour

DOI

10.1109/89.466662

Filename

466662