Title :
The speech enhancement of the G.723.1 vocoder using multi-order formant postfilter
Author :
Lee, Heewon ; Kim, Jeong Jin ; Jang, Kyunga ; Bae, MyungJin
Author_Institution :
Dept. of Inf. & Telecommun. Eng., Soongsil Univ., Seoul, South Korea
Abstract :
The speech quality of CELP type vocoders is improved by compensating the formant distortion with a formant postfilter. The formant postfilter is generally composed of the conventional ARMA filter with the 1-order tilt compensation filter. We propose a new method to improve speech quality using multi-order tilt compensation filter instead of the 1-order tilt compensation filter. This algorithm is applied to G.723.1 for Internet phone or videoconferencing. Consequently, spectrum distortion is improved about 3.22% and speech quality is improved about 0.04 of MOS score maximally
Keywords :
Internet telephony; autoregressive moving average processes; filtering theory; linear predictive coding; speech enhancement; speech intelligibility; teleconferencing; vocoders; 1-order tilt compensation filter; ARMA filter; CELP type vocoders; G.723.1 vocoder; Internet Phone; MOS score; formant distortion compensation; multi-order formant postfilter; multi-order tilt compensation filter; spectrum distortion; speech enhancement; speech quality; videoconferencing; Bit rate; Decoding; Frequency; Information filtering; Information filters; Linear predictive coding; Signal synthesis; Speech enhancement; Teleconferencing; Vocoders;
Conference_Titel :
TENCON 99. Proceedings of the IEEE Region 10 Conference
Conference_Location :
Cheju Island
Print_ISBN :
0-7803-5739-6
DOI :
10.1109/TENCON.1999.818513
