Patent ID: 7072832
Filing Date: 2006-07-04
Classification: G10L

Abstract:
1. A speech encoding system comprising: a detector for detecting whether an input speech signal generally has a triggering characteristic during an interval; an encoder supporting at least one of a first encoding scheme and a second encoding scheme applicable to the speech signal for a frame associated with the interval, the first encoding scheme having a pre-processing procedure for processing the inputted speech signal to form a revised speech signal biased toward a generally ideal voiced and stationary characteristic; and a selector for selecting one of the first encoding scheme and the second encoding scheme based upon the detection or absence of the triggering characteristic in the interval of the input speech signal; wherein the first encoding scheme uses a first frame type for coding the input speech signal at a selected rate and the second encoding scheme uses a second frame type for coding the input speech signal at the same selected rate, wherein the second frame type is different from the first frame type is different from the first frame type; wherein said first frame type allocates 25 bits for filter coefficient indicators, 1 bit for a type indicator, 8 bits for an adaptive codebook index, 120 bits for a fixed codebook index, 6 bits for an adaptive codebook gain, and 10 bits for a fixed codebook gain.