Methods of improving vector-scalar quantization of LPC coefficients
ICASSP '91 Proceedings of the Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference
Efficient vector quantization of LPC parameters at 24 bits/frame
ICASSP '91 Proceedings of the Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference
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In this paper, we propose an efficient vector quantization scheme and a new LPC analysis scheme, both of which exploit interframe correlation in the successive spectrum envelope of speech signals. The first quantization scheme proposed is a multi-stage vector quantization of LSP parameters with a partially adaptive codebook (MSVQ-AC). The second new algorithm is an LPC analysis scheme, with closed-loop adaptive prefiltering (LPC-PF), which realizes temporary higher order analysis than the standard LPC with a few additional transmission bits. A combined system of the LPC-PF and 2-split, 2-stage VQ with the adaptive codebook can quantize 104 order LSP parameters at around 23 bits/frame, realizing sufficient quality and reasonable complexity.