Title :
A Multimode Multi-Band Excitation with Linear Prediction vocoder
Author :
Liang, Yanxia ; Yang, Jiawei ; Li, Ye
Author_Institution :
Broadband Wireless Commun. Lab., Xidian Univ., Xi´´an, China
Abstract :
This paper presents a Multimode Multi-Band Excitation with Linear Prediction model (MMBE-LP) at 2.35kbps. Unvoiced/Voiced (U/V) decisions and spectrum amplitudes estimations are improved in this vocoder compared with MBE vocoder. For better quantization results, different codebooks are used for different modes of U/V decision, so the number of sub-bands in a frame is fixed. Spectral amplitudes are estimated by Linear Prediction Mode and quantized by MSVQ (Multi-Stage Vector Quantization). Simulation results show that the unvoiced and voiced parts of synthetic speech are coherent with the parts of original speech obviously.
Keywords :
Amplitude estimation; Broadband communication; Frequency; Intserv networks; Laboratories; Predictive models; Speech enhancement; Vector quantization; Vocoders; Wireless communication; LP mode; Multi-Stage Vector Quantization; multi-band excitation; multimode quantization;
Conference_Titel :
Wireless Communications, Networking and Information Security (WCNIS), 2010 IEEE International Conference on
Conference_Location :
Beijing, China
Print_ISBN :
978-1-4244-5850-9
DOI :
10.1109/WCINS.2010.5541932