Patent ID: 6757649
Filing Date: 2004-06-29
Classification: G10L,H03G

Abstract:
A speech processing system for encoding a fixed codebook gain and an adaptive codebook gain for a frame of a speech signal, the speech processing system comprising:an encoding system operable to selectively designate a rate selection and a type classification of the frame; the encoding system operable with a 2D gain quantization table to encode the fixed codebook gain and the adaptive codebook gain when the type classification is a first type; the encoding system operable with a pre-gain quantization table to encode the adaptive codebook gain when the type classification is a second type, the pre-gain quantization table selectable as a function of the rate selection; and the encoding system operable with a delayed gain quantization table to encode the fixed codebook gain when the type classification is the second type, the delayed gain quantization table selectable as a function of the rate selection; where the pre-gain quantization table comprises a first predetermined vector represented as {0.60699869, 0.59090763, 0.64920781, 0.64610492} and a second predetermined vector represented as {0.68101613, 0.65403889, 0.64210982, 0.63130892} when the rate selection is a full rate.