ISCA Archive Eurospeech 1993
ISCA Archive Eurospeech 1993

A reliable postprocessor for pitch determination algorithms

Gao Yang, Henri Leich

A difficult problem for a PDA (Pitch Determination Algorithm) of speech signal is to avoid gross errors such as halving pitch and multiple pitch. This paper proposes a new postprocessor which can reliablely and efficiently correct the gross errors. The basic principle of the postprocessor is based on utilizing the histogram of the past estimated values of pitch. It can be guaranteed that the correct value of pitch is situated in a small region centring around the peak position of the histogram. A reference value calculated in the small region and sometimes modified with the progressive values outside the small region is used to verify and correct the present estimated pitch. The results obtained by testing the data base in the laboratory showed that the PDA with the proposed postprocessor is so reliable that no gross error was found.

Keywords: Speech Coding, Speech Analysis, Pitch estimate