Split Table Extension: A Low Complexity LVQ Extension Scheme in Low Bitrate Audio Coding

Embedded algebraic vector quantization (EAVQ) is a fast and efficient lattice vector quantization (LVQ) scheme used in low-bitrate audio coding. However, a defect of EAVQ is the overload distortion which causes unpleasant noises in audio coding. To solve this problem, specific base codebook extensio...

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Bibliographic Details
Published in:IEEE signal processing letters 2010-01, Vol.17 (1), p.59-62
Main Authors: Jin Wang, Peilin Liu, Ji Kong, Rendong Ying
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Audio coding
Bit rate
Code standards
Codecs
Embedded algebraic vector quantization
Encoding
lattice vector quantization
Lattices
Speech coding
split table extension
Vector quantization
Video coding
Voronoi extension
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Summary:Embedded algebraic vector quantization (EAVQ) is a fast and efficient lattice vector quantization (LVQ) scheme used in low-bitrate audio coding. However, a defect of EAVQ is the overload distortion which causes unpleasant noises in audio coding. To solve this problem, specific base codebook extension schemes should be carefully considered. In this letter, we present a novel EAVQ codebook extension scheme-split table extension (STE), which splits a vector into two smaller vectors: one in the base codebook and the other in the split table. The base codebook and the split table are designed according to the appearance probability of quantized vectors in audio segments. Experiments on encoding multiple audio and speech sequences show that, compared with the existed Voronoi extension scheme, STE greatly reduces computation complexity and storage requirement while achieving similar coding quality.
ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2009.2032982