DocumentCode :
1873848
Title :
Efficient coding of LPC parameters using the ordering property of line spectrum pairs
Author :
Lee, InSung ; Woo, Hong Chae ; Kang, Sangwon
Author_Institution :
Mobile Commun. Div., Signal Process. Sect., Daejon, South Korea
Volume :
2
fYear :
1995
fDate :
25-28 Jul 1995
Firstpage :
723
Abstract :
Efficient quantization methods of the line spectrum pairs (LSP) which have good performance and low complexity and memory are proposed. The ordering property of the LSP parameters is utilized in a scalar quantizer and a vector-scalar quantizer of the LSP parameters. The proposed scalar quantization algorithm needs 31 bits/frame which is 3 bits less than in the conventional scalar quantization method with interframe prediction in order to maintain the transparent quality of speech so that the average spectral distortion is less than 1 dB. The improved algorithm is implemented in the QCELP vocoder which is used in a CDMA digital cellular system and its performance is also evaluated. The quantization method using the ordering property of the LSP parameters is applied in the vector-scalar quantization scheme. The improved vector-scalar quantizer achieves an average spectral distortion of 1 dB using 26 bits/frame. The quantization performance has also been shown to be robust across databases and different speakers
Keywords :
cellular radio; code division multiple access; digital radio; linear predictive coding; spectral analysis; speech coding; vector quantisation; vocoders; CDMA digital cellular system; DPCM; LSP parameters; QCELP vocoder; average spectral distortion; databases; interframe prediction; line spectrum pairs; memory; ordering property; performance evaluation; quantization methods; quantization performance; scalar quantization algorithm; scalar quantizer; speech quality; vector-scalar quantizer; Linear predictive coding; Multiaccess communication; Performance evaluation; Pulse modulation; Robustness; Signal processing; Signal processing algorithms; Speech coding; Vector quantization; Vocoders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
ISSN :
1090-3038
Print_ISBN :
0-7803-2742-X
Type :
conf
DOI :
10.1109/VETEC.1995.504963
Filename :
504963
Link To Document :
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