Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Fixed Point Analysis of Frequency to Instantaneous Frequency Mapping for Accurate Estimation of F0 and Periodicity

Hideki Kawahara (1), Haruhiro Katayose (2), Alain de Cheveigné (3), Roy D. Patterson (4)

(1) Wakayama University/ATR/CREST, Wakayama, Japan (2) Wakayama University/LIST, Japan (3) IRCAM/CNRS, Paris, France (4) CNBH, University of Cambridge, Cambridge, UK

An accurate fundamental frequency (F0) estimation method for non-stationary, speech-like sounds is proposed based on the differential properties of the instantaneous frequencies of two sets of filter outputs. A specific type of fixed points of mapping from the filter center frequency to the output instantaneous frequency provides frequencies of the constituent sinusoidal components of the input signal. When the filter is made from an isometric Gabor function convoluted with a cardinal B-spline basis function, the differential properties at the fixed points provide practical estimates of the carrier-to-noise ratio of the corresponding components. These estimates are used to select the fundamental component and to integrate the F0 information distributed among the other harmonic components.


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Bibliographic reference.  Kawahara, Hideki / Katayose, Haruhiro / Cheveigné, Alain de / Patterson, Roy D. (1999): "Fixed point analysis of frequency to instantaneous frequency mapping for accurate estimation of F0 and periodicity", In EUROSPEECH'99, 2781-2784.