Patent ID: 7191122
Filing Date: 2007-03-13
Classification: G10L,H03G

Abstract:
1. A speech compression system for processing a speech signal, the speech compression system comprising: a mode selection module configured to select one of a first framing structure and a second framing structure for encoding parameters of a frame of the speech signal; and a prediction module configured to predict a fixed codebook characteristic for each of a plurality of subframes when the second framing structure is selected, the prediction module is further configured to predict the fixed codebook characteristic as a function of prediction coefficients associated with each subframe and a fixed codebook characteristic from each of plurality of subframes of a previous frame; wherein a fixed codebook gain for each of the subframe is represented with respective predicted fixed codebook characteristic when the second framing structure is selected; wherein the speech compression system derives a pitch gain for each of a plurality of subframes during pitch pre-processing, quantizes the pitch gain of each of the subframes, and performs a delayed joint quantization of the fixed codebook gains for each of the subframes as a function of the stored quantized pitch gain of each of the subframes.