Speech Processing by Computer

 

LECTURE 5

FORMANT AND FUNDAMENTAL FREQUENCY ANALYSIS

 

 

Objectives

 

By the end of the session you should:

be able to describe two methods for separating information about source and filter in a spectrum

understand the problems associated with estimating formant frequencies

be able to describe one method for formant frequency estimation

understand the problems associated with estimating fundamental frequency

be able to describe one method for fundamental frequency estimation

 

Outline


 

5.      Formant and Fundamental Frequency Analysis

5.1.   Source-filter separation methods

5.1.1.      Spectral modelling (LPC)

5.1.2.      Cepstrum

5.2.   Formant Frequency Analysis

5.2.1.      General issues

5.2.2.      From cepstrally-smoothed spectra

5.2.3.      From LPC spectrum

5.3.   Fundamental Frequency Analysis

5.3.1.      General issues

5.3.2.      Time-domain methods

5.3.2.1.Autocorrelation

5.3.3.      Frequency-domain methods

5.3.3.1.Cepstrum

5.3.4.      Combination methods

5.3.4.1.Inverse filtering

 

Reading

 

T. Parsons, Voice and Speech Processing, McGraw-Hill, 1987, Chapter 8.