Title :
2 kbps-2.4 kbps low complexity interpolative vocoder
Author :
Hao, Jiang ; Huijuan, Cui ; Kun, Tang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In this paper a 2 kbps-2.4 kbps low complexity interpolative speech coding algorithm is presented. This speech coder takes the good ideal of waveform interpolation, but adopts a different framework to simplify the system complexity. Band pass analysis is made to estimate the random component in the speech excitation and used to estimate contour of the random prototype in the synthesis procedure. Synthesis algorithm both in the time domain and frequency domain are studied. This paper also presents some important techniques such as one-frame look ahead pitch smoothing algorithm and parameter quantization. This speech coding scheme has been real-time implemented on a 200 Hz personal computer
Keywords :
computational complexity; frequency-domain analysis; interpolation; linear predictive coding; parameter estimation; quantisation (signal); smoothing methods; speech coding; speech synthesis; time-domain synthesis; vocoders; 2 to 2.4 kbit/s; LPC; band pass analysis; frequency domain synthesis algorithm; interpolative speech coding algorithm; low complexity interpolative vocoder; one-frame look ahead pitch smoothing algorithm; parameter quantization; personal computer; random component estimation; random prototype contour estimation; real-time implementation; speech coder; speech excitation; system complexity; time domain synthesis algorithm; waveform interpolation; Frequency domain analysis; Interpolation; Microcomputers; Prototypes; Quantization; Smoothing methods; Speech analysis; Speech coding; Speech synthesis; Vocoders;
Conference_Titel :
Communication Technology Proceedings, 1998. ICCT '98. 1998 International Conference on
Conference_Location :
Beijing
Print_ISBN :
7-80090-827-5
DOI :
10.1109/ICCT.1998.741009
