Implementation of a low delay modified CELP coder at 4.8 kb/s

Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE（1995）

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摘要

This paper presents a low delay high quality speech coder at low bit rates. The configuration of the speech coder is mainly composed of a formant filter, a pitch codebook, an excitation joint codebook, and post enhancement filters. The algorithm of the speech coder is briefly described. Two versions of the speech coder have been implemented in real-time with a single: ADSP-21020 chip. Both objective measurement and informal subjective listening tests show that the proposed speech coder has high quality performance

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关键词

computational complexity,digital signal processing chips,filtering theory,linear predictive coding,speech coding,vocoders,4.8 kbit/s,adsp-21020 chip,celp coder,excitation joint codebook,formant filter,informal subjective listening tests,low bit rates,low delay high quality speech coder,objective measurement,pitch codebook,post enhancement filters,testing,switches,decoding,real time,chip

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