Vector quantifier shape search in pyramid

摘要

A method for searching for a Pyramid Vector Quantifier form, PVQ, performed by an encoder, the PVQ that takes an objective vector x as input and derives a vector and iteratively adding unit pulses in an inner dimension search loop, the method characterized by: before entering a following internal dimension search loop to add unit pulse: - determine (102, 204), based on a maximum pulse amplitude, maxampy, of a current vector and, if more than one current bit word length is needed to represent, in a lossless manner, a variable, enloopy, related to an accumulated energy of y, in the near inner dimension loop (103).