DocumentCode :
1589192
Title :
On a low bit rate speech coder using multi-level amplitude algebraic method
Author :
Jung, Chan-Joong ; Park, Young-Ho ; Bae, Myung-Jin
Author_Institution :
Soongsil Univ., Seoul, South Korea
Volume :
2
fYear :
1999
fDate :
6/21/1905 12:00:00 AM
Firstpage :
1444
Abstract :
This paper analyzes the dynamic sparse algebraic codebook used to model a residual signal for ACELP. It proposes an improved algebraic codebook structure with a new searching process. The proposed algorithm improves the disadvantage of an algebraic codebook without computation increment. First, this paper makes it possible to select various pulse amplitudes differently from the conventional method which looks up the sign bit simply. In addition, two pulses are selected on the same track and the delay of the LP is minimized at the transient period when the LSF interpolation is performed using a transient detector from unvoiced to voiced speech without additional computation. For telephone line speech quality, a 5.6 kbps speech coder using the proposed algorithm was equivalent to the 6.3 kbps MP-MLQ from the viewpoint of subjective speech quality. For objective quality, however, the degradation was MNRU Q=15 dB compared to MP-MLQ where MNRU Q=15 dB
Keywords :
algebraic codes; interpolation; linear predictive coding; search problems; signal detection; speech coding; speech intelligibility; 5.6 kbit/s; 6.3 kbit/s; ACELP; LSF interpolation; MP-MLQ; algebraic codebook structure; algorithm; dynamic sparse algebraic codebook; low bit rate speech coder; multi-level amplitude algebraic method; objective speech quality; pulse amplitudes; residual signal; searching process; sign bit; speech quality; subjective speech quality; telephone line; transient detector; transient period; Bit rate; Delay; Detectors; Electronic mail; Information analysis; Internet; Interpolation; Signal analysis; Speech synthesis; Vocoders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
Type :
conf
DOI :
10.1109/MILCOM.1999.821442
Filename :
821442
Link To Document :
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