On improving vector excitation coders through the use of spherical lattice codebooks (SLCs)
M.A. Ireton, Costas S. Xydeas · International Conference on Acoustics, Speech, and Signal Processing · 2003
Two novel techniques for use in VXC (vector excitation coding) speech coders are presented. The first enables massive excitation codebooks (>or=20 b) to be used at realizable complexities by using a novel spherical lattice codebook for the excitation codebook. The second technique is a generalization of the gain-optimized error measure which allows any number of gains to be calculated for each excitation vector. This multiple-gain VXC can be thought of as a hybrid between multipulse and VXC.>