Title :
Analysis-by-synthesis voicing cut-off determination in harmonic coding
Author :
Jia, Wenhui ; Chan, Wai-Yip
Author_Institution :
Brooktrout Technol., Los Gatos, CA, USA
Abstract :
In low bit-rate harmonic speech coding, voicing information is often specified by a cut-off frequency of the spectrum. Many approaches of cut-off estimation depend on spectral matching, where a fixed prototype spectrum is used to model voiced harmonics. However, voiced harmonics do not always show a regular shape. One of the causes is harmonic interference. We propose an analysis-by-synthesis voicing cut-off determination scheme that takes into account harmonic interactions in spectral matching. The proposed scheme has been embedded in a 2.4 kb/s harmonic coder. Subjective listening tests show that the scheme performs well and is robust against noise
Keywords :
frequency estimation; harmonic analysis; speech coding; speech processing; speech synthesis; 2.4 kbit/s; analysis-by-synthesis voicing cut-off; cut-off frequency; fixed prototype spectrum; harmonic coding; harmonic interactions; harmonic interference; low bit-rate harmonic speech coding; noise robustness; spectral matching; spectrum; subjective listening tests; voiced harmonics modeling; voicing information; Algorithm design and analysis; Cutoff frequency; Frequency domain analysis; Frequency estimation; Harmonic analysis; Power harmonic filters; Prototypes; Speech coding; Speech synthesis; Time domain analysis;
Conference_Titel :
Speech Coding, 2000. Proceedings. 2000 IEEE Workshop on
Conference_Location :
Delavan, WI
Print_ISBN :
0-7803-6416-3
DOI :
10.1109/SCFT.2000.878397
