Title :
Rule-based speech analysis and application of CELP coding
Author :
Copperi, Maurizio
Author_Institution :
CSELT, Torino, Italy
Abstract :
An approach is presented for efficiently encoding speech signals at low bit rates, by exploiting a combination of various speech analysis and compression techniques cooperating via a rule-based reasoning system. A front-end analyzer compresses speech events at nonuniformly spaced time intervals, by resorting to dynamic and static variable-frame-rate methods relevant to perception models. Then a codebook-excited-linear-predictive (CELP) coder performs a perceptually meaningful identification and quantization of the excitation parameters, to provide an optimal rendition of the original signal. This coding scheme can reduce the transmission rate down to 2.4-2.8 kb/s, while retaining a very good quality. The main applications are in voice response systems and voice mail
Keywords :
data compression; encoding; expert systems; speech analysis and processing; voice communication; 2.4 to 2.8 kbit/s; LPC; codebook-excited-linear predictive coding; excitation parameters; perception models; rule-based reasoning system; speech analysis; speech compression; speech signal encoding; static variable-frame-rate methods; voice mail; voice response systems; Bit rate; Encoding; Interpolation; Linear predictive coding; Presses; Quantization; Signal processing; Speech analysis; Speech synthesis; Voice mail;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Conference_Location :
New York, NY
DOI :
10.1109/ICASSP.1988.196533
