Method and system for CELP speech coding and codebook for use therewith (Low Complexity CELP Speech Coder)

Abstract

Apparatus and method for encoding speech using a codebook excited linear predictive (CELP) speech processor and an algebraic codebook for use therewith. The CELP speech processor receives a digital speech input representative of human speech and performs linear predictive code analysis and perceptual weighting filtering to produce a short term speech information and a long term speech information. The CELP speech processor utilizes an organized, non-overlapping, algebraic codebook containing a predetermined number of vectors, uniformly distributed over a multi-dimensional sphere to generate a remaining speech residual. The short term speech information, long term speech information and remaining speech residual are combinable to form a quality reproduction of the digital speech input.

 

U.S. Patent and Trademark Office Description

PTO

Inventor(s)

John S. Baras, Yuhung Kao

Date Issued

12/06/1994

Patent No.

5,371,853