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

Volume

vol.2

fYear

1998

fDate

22-24 Oct 1998

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Technology Proceedings, 1998. ICCT '98. 1998 International Conference on

Conference_Location

Beijing

Print_ISBN

7-80090-827-5

Type

conf

DOI

10.1109/ICCT.1998.741009

Filename

741009