Title :
Comprehensive improvement in low bit rate speech coding
Author :
Fan, Changxin ; Ma, Hongfei
Author_Institution :
Dept. of Inf. Eng., Xidian Univ., Xi´´an, China
Abstract :
A comprehensive improved LPC (linear prediction coding) vocoder scheme is suggested. Many effective techniques are used in the scheme, such as vector quantization (VQ), line-spectrum pair parameters, and the just-noticeable-difference error criterion. By using these techniques it is possible to increase the linear prediction order from 10 to 14, and the sampling rate from 8 to 10 kHz without increasing the transmission bit rate. The design principles and the specifications of the scheme are introduced. Computer simulation shows that it gives very good synthetic speech quality at 2400 b/s. The sonograms of the original and synthesized speeches are also given for comparison
Keywords :
encoding; filtering and prediction theory; speech analysis and processing; 2400 bit/s; 8 to 10 kHz; LPC vocoder; computer simulation; just-noticeable-difference error criterion; line-spectrum pair parameters; linear prediction coding; low bit rate speech coding; sampling rate; sonograms; synthetic speech quality; vector quantization; Bit rate; Computer errors; Computer simulation; Linear predictive coding; Sampling methods; Sonogram; Speech coding; Speech synthesis; Vector quantization; Vocoders;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64271
