Title :
Improving speech quality of CELP coder
Author :
Lee, J.I. ; Un, C.K.
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
Abstract :
Although the speech quality of the code excited linear prediction (CELP) coder at 4800 bit/s is relatively good, it is still perceived as rough or noisy. The authors propose a residual shaping method that produces, without signal distortion, quality comparable to that obtained by adaptive postfiltering. The proposed method is particularly effective in the multiple tandeming environment.
Keywords :
encoding; filtering and prediction theory; speech analysis and processing; speech intelligibility; 4800 bit/s; CELP coder; code excited linear prediction; multiple tandeming environment; residual shaping method; speech coding; speech quality improvement;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19890854
