Patent Document ID: 20020072904
Application ID: 09832132
Patent Status: 0

Claim One:
1. In a Noise Feedback Coding (NFC) system, a method of efficiently searching N predetermined Vector Quantization (VQ) codevectors for a preferred one of the N VQ codevectors to be used in coding a speech or audio signal, comprising the steps of: (a) predicting the speech signal to derive a residual signal; (b) deriving a ZERO-INPUT response error vector common to each of the N VQ codevectors; (c) deriving N ZERO-STATE response error vectors each based on a corresponding one of the N VQ codevectors; and (d) selecting the preferred one of the N VQ codevectors as the VQ output vector corresponding to the residual signal based on the ZERO-INPUT response error vector and the N ZERO-STATE response error vectors.