Patent ID: 6704703
Filing Date: 2004-03-09
Classification: G10L

Abstract:
A method for determining an excitation signal in an analysis-by-synthesis speech coder, the excitation signal being a sum of at least three vector terms, each vector term k being a product of a codebook vector Zk and an associated gain term gk, the method comprising:determining a first vector term g0z0 representative of a target excitation vector x; and recursively determining each remaining vector term k as a vector term gkzk representative of the difference between the target excitation vector x and the sum of previously determined vector terms, &Sum;i=0k-1&it;gi&it;zi,andwherein the gain term of each vector term is determined by minimizing an error function E representative of the difference between the target excitation vector x and the sum of that vector term and all previously determined vector terms, &Sum;i=0k-1&it;gi&it;zi.