Title :
High-order allpole modelling of the spectral envelope
Author :
Champion, Terrence G. ; McAuley, R.J. ; Quatieri, Thomas F.
Author_Institution :
Rome Lab., Hanscom AFB, MA, USA
Abstract :
The sinusoidal transform coder (STC) is a vocoding technique that has been evolving over the past few years which represents speech as a harmonic set of sinewaves and has demonstrated synthetic speech of good quality at rates from 2400 b/s to 4800 b/s. Previously, a cepstral model was used to code the sinewave amplitudes. This paper reports on a new approach that fits an allpole model to the sine-wave amplitudes and coding is done in terms of both scalar- and vector-quantization of the line spectral frequencies (LSFs). A new measure is developed to objectively quantify the quantizer design performance
Keywords :
higher order statistics; poles and zeros; quantisation (signal); spectral analysis; speech coding; transform coding; vector quantisation; vocoders; cepstral model; coding; harmonic set; high-order allpole modelling; line spectral frequencies; quantizer design performance; scalar-quantization; sinewaves; sinusoidal transform coder; spectral envelope; speech; synthetic speech; vector-quantization; vocoding technique; Cepstral analysis; Context modeling; Fourier transforms; Frequency measurement; Frequency synthesizers; Laboratories; Linear predictive coding; Phase measurement; Speech analysis; Speech synthesis;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389239
