Title :
A robust 800 bps MBE coder with VQ and MLP
Author :
Cui, Huijuan ; Jiang, Hao
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A speech coding algorithm for a robust 800 bps coder has been developed based on the multi-band excitation (MBE) model. The techniques of smoothing the pitch period by dynamic programming, LPC all-pole model to approximate the MBE spectral shape, formant enhancement, interpolation, vector quantizer (VQ), and multilayer perception of neural networks (MLP), etc. are adopted to improve the performance while maintaining a very low bit rate speech coding. It can be implemented in real-time using a single chip ADSP2181 fixed point DSP. The synthesized speech is clear and intelligible. It is even intelligible in the presence of background noise at 80 dB
Keywords :
digital signal processing chips; dynamic programming; fixed point arithmetic; interpolation; linear predictive coding; multilayer perceptrons; poles and zeros; smoothing methods; spectral analysis; speech coding; speech intelligibility; speech synthesis; vector quantisation; vocoders; 800 kbit/s; ADSP2181 fixed point DSP chip; LPC all-pole model; MBE coder; MBE spectral shape approximation; MLP; VQ; background noise; dynamic programming; formant enhancement; interpolation; multi-band excitation; multilayer perception; neural networks; performance; real-time implementation; smoothing pitch period; speech coding algorithm; speech intelligibility; speech synthesis; vector quantizer; very low bit rate speech coding; Dynamic programming; Interpolation; Linear predictive coding; Multi-layer neural network; Neural networks; Robustness; Smoothing methods; Spectral shape; Speech coding; Speech synthesis;
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.1998.741011
