Title :
Differential coding of speech LSF parameters using hybrid vector quantization and bidirectional prediction
Author :
Silva, Lucio Martins da ; Alcaim, Abraham
Author_Institution :
Dept. of Electr. Eng., Brasilia Univ., Brazil
fDate :
3/1/2000 12:00:00 AM
Abstract :
This article presents a new strategy to encode the LP (linear predictive) short-time spectral envelope (STSE) of speech. A better reconstruction of the STSE is achieved by modifying the usual trade-off between the transmission rate of the LP parameters and the performance of the quantization algorithm. A differential coding based on bidirectional prediction and hybrid vector quantization is used to compensate the increase in transmission rate. Simulation results show the effectiveness of this coding strategy
Keywords :
filtering theory; linear predictive coding; parameter estimation; signal reconstruction; spectral analysis; speech coding; vector quantisation; CELP coder; LP parameters; LP short-time spectral envelope; bidirectional prediction; differential coding; hybrid vector quantization; information compression; line spectral frequencies; linear prediction coding; quantization algorithm; short-term linear prediction filter; simulation results; speech LSF parameters; speech envelope reconstruction; speech quality; transmission rate; Bit rate; Information filtering; Information filters; Linear predictive coding; Nonlinear filters; Predictive models; Signal analysis; Speech analysis; Speech coding; Vector quantization;
Journal_Title :
Speech and Audio Processing, IEEE Transactions on
