Patent ID: 6813602
Filing Date: 2004-11-02
Classification: G10L

Abstract:
A method of using a random subcodebook in a speech compression system, said method comprising:providing at least one random subcodebook comprising a first plurality of codevectors, wherein at least one codevector further comprises a plurality of random magnitude elements; and rearranging at least two elements of the at least one codevector to form a second plurality of codevectors; first searching the at least one random subcodebook for candidate basis codevectors, wherein the first searching independently searches the at least one random subcodebook open-loop, based on an ideal excitation; second searching the at least one random subcodebook for candidate basis codevectors, wherein the second searching independently searches the at least one random subcodebook closed-loop, based on a weighted error signal; wherein the at least one random subcodebook comprises a first codevector orthogonal to a second codevector, the first codevector having even elements and the second codevector having odd elements.