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A Fast Indexing Method for Shells of the Gosset Lattice

Authors:
Krüger, H.Geiser, B.Vary, P. ,  Li, H. T. ,  Zhang, D.
Book Title:
Konferenz Elektronische Sprachsignalverarbeitung (ESSV)
Organization:
ITG, DEGA
Publisher:
TuDPress Verlag der Wissenschaften GmbH
Series:
Studientexte zur Sprachkommunikation
Volume:
61
Pages:
p.p. 205-212
Date:
Sep. 2011
ISBN:
978-3-94271-037-4
ISSN:
0940-6832
Language:
English

Abstract

An iterative algorithm for indexing spherical shells of the Gosset lattice E8 is described. The proposed approach has a significantly lower computational complexity than the traditional ”Schalkwijk” indexing method. Both methods are described in detail and an analysis of the encoding and decoding complexity is pre- sented. The new indexing method is implemented in the “Gosset Low Complexity Vector Quantizer” (GLCVQ) which is used for super-wideband transform audio coding in Amd. 6 to ITU-T Rec. G.729.1.

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