Title :
Spectrograms of overlapping speech based upon instantaneous frequency
Author :
Dorrell, P.R. ; Denbigh, P.N.
Author_Institution :
Sch. of Eng., Sussex Univ., Brighton, UK
Abstract :
A method is presented for the production of a novel type of spectrogram which is intended to emphasise the harmonic nature of speech. A bank of gammatone filters separates the speech into frequency bands whereupon the frequency of the most dominant speech component in each band is obtained by exploiting the FM capture effect. A validation process rejects the frequency estimates from any band where immediately previous estimates show large fluctuations due to noise and cross-interference. The remaining current estimates are then plotted on a spectrogram type display. Even with two simultaneous voices, clear harmonic patterns can be seen from which it is hoped that two pitch tracks may be determined
Keywords :
digital filters; filtering and prediction theory; harmonic analysis; parameter estimation; spectral analysis; speech analysis and processing; FM capture effect; cross-interference; dominant speech component; frequency estimates; gammatone filters; harmonic; instantaneous frequency; noise; overlapping speech; pitch tracks; simultaneous voices; spectrogram; validation process; Filter bank; Fluctuations; Frequency estimation; Frequency measurement; Power harmonic filters; Reverberation; Robustness; Spectrogram; Speech; Time measurement;
Conference_Titel :
Speech, Image Processing and Neural Networks, 1994. Proceedings, ISSIPNN '94., 1994 International Symposium on
Print_ISBN :
0-7803-1865-X
DOI :
10.1109/SIPNN.1994.344838
