Title :
Improving temporal resolution by using LaGrange interpolation filter (LIF) [speech coding]
Author :
El-Kouatly, Rand ; El-Ramly, Salwa H.
Author_Institution :
Dept. of Electr. & Commun. Eng., Ain Shams Univ., Cairo, Egypt
Abstract :
This paper introduces a new technique for improving speech quality of a low bit rate code-excited linear prediction (CELP) coder without introducing any increase in bit rate or complexity. The idea is to improve the resolution of the adaptive codebook contribution by using a LaGrange interpolation filter (LIF) in place of the Hamming sinc filter originally used. The designed filter is tested on a floating point C-simulation of the G.729 8 kb/s CS-ACELP coder (Salami et al, 1995). The results show that the designed filter has generally improved the temporal resolution by increasing the pitch prediction gain.
Keywords :
computational complexity; filters; floating point arithmetic; interpolation; linear predictive coding; signal resolution; speech coding; 8 kbit/s; CELP coder; CS-ACELP coder; Hamming sinc filter; LaGrange interpolation filter; adaptive codebook contribution; bit rate; code-excited linear prediction coder; complexity; filter design; filter test; floating point C-simulation; pitch prediction gain; speech coding; speech quality; temporal resolution; Adaptive filters; Delay; Frequency; Interpolation; Lagrangian functions; Nonlinear filters; Sampling methods; Signal synthesis; Speech enhancement; Speech synthesis;
Conference_Titel :
Microelectronics, 1999. ICM '99. The Eleventh International Conference on
Print_ISBN :
0-7803-6643-3
DOI :
10.1109/ICM.2000.884847
