Title :
A 5.4 kbps speech coder based on multi-band excitation and linear predictive coding
Author :
Yang, Haiyun ; Koh, Soo-Ngee ; Sivaprakasapillai, P. ; Doshita, Shuji
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
Abstract :
Recent work has shown that multi-band excitation (MBE) is capable of synthesizing high quality speech in the range of 4.8-8.0 kbps. In this paper, the multi-band excitation and linear predictive coding (MBE-LPC) model, which used the LPC analysis to obtain the prediction residual, and uses the MBE model to estimate the residual spectrum is presented. Our motivation is to improve the excitation model of LPC vocoders in the frequency domain. Based on the MBE-LPC model, a 5.4 kbps speech coding is presented. An adaptive postfilter is used to improve the perceptual quality of the decoded speech. Informal listening tests show that the perceptual quality of the decoded speech of the proposed coder is better than that of the 4.15 kbps improved (IMBE) coder
Keywords :
linear predictive coding; speech synthesis; vocoders; 5.4 kbit/s; LPC vocoders; adaptive postfilter; decoded speech; excitation model; frequency domain; high quality speech synthesis; linear predictive coding; multi-band excitation; residual spectrum; speech coder; speech coding; Decoding; Frequency estimation; Linear predictive coding; Predictive models; Signal analysis; Signal synthesis; Speech analysis; Speech coding; Speech synthesis; Vocoders;
Conference_Titel :
TENCON '94. IEEE Region 10's Ninth Annual International Conference. Theme: Frontiers of Computer Technology. Proceedings of 1994
Print_ISBN :
0-7803-1862-5
DOI :
10.1109/TENCON.1994.369267
