Title :
A novel medium rate speech codec and its implementation with ATD-C25
Author :
Zhen, Yang ; Bao-Yu, Zhen
Author_Institution :
Wire Eng. Dept., Nanjing Inst. of Posts & Telecommun., China
Abstract :
The algorithm has several characteristics: high objective and subjective quality, including more than 20 dB SNR; little time delay caused by filtering and coding, because of the new decomposing subband structure of the SBC, which has been carried out with the help of a group of special IIR filters, and the coding method in which input signals are handled vector by vector instead of frame by frame; good quality shown in recovered speech in high frequency bands because of the development of a fast search VQ technique. The latter two advantages guarantee the realization of this new codex in real time with the powerful digital signal processor TMS320C25
Keywords :
codecs; digital filters; digital signal processing chips; encoding; speech analysis and processing; ATD-C25; IIR filters; SNR; coding; digital signal processor; fast search VQ technique; filtering; medium rate speech codec; subband structure; Band pass filters; Costs; Delay effects; Filtering; Finite impulse response filter; Frequency; Hydrogen; Signal synthesis; Speech codecs; Speech synthesis;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184274
