A low-bit-rate extension algorithm to the 8 kbit/s CS-ACELP based on adaptive fixed codebook modeling

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In this paper, we propose an adaptive encoding method of Bred codebook in CELP coders and implement an adaptive fixed code-excited linear prediction (AF-CELP) speech coder as a low-bit-rate extension to the 8 kbit/s CS-ACELP. The AF-CELP can be implemented at low bit rates as well as low complexity by exploiting the fact that the fixed codebook contribution to the speech signal is periodic, as is the adaptive codebook (or pitch filter) contribution. Listening tests show that the 6.4 kbit/s AF-CELP has a comparable quality to the 8 kbit/s CS-ACELP under real environmental test conditions.
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Issue Date
1999-07
Language
English
Article Type
Article
Citation

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, v.E82D, no.7, pp.1087 - 1092

ISSN
0916-8532
URI
http://hdl.handle.net/10203/76826
Appears in Collection
EE-Journal Papers(저널논문)
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