A GAIN QUANTIZATION METHOD IN ANALYSIS-BY-SYNTHESIS LINEAR PREDICTIVE SPEECH CODING

摘要

A gain quantization method, in analysis-by-synthesis linear predictive speech coding, comprises the steps: determine a first gain (GAIN1) for an optimal excitation vector from a first code book; quantize the first gain (GAIN1); determine an optimal second gain (GAIN2) for an optimal excitation vector from a second code book; determine a linear prediction of the logarithm of the second gain (GAIN2) from the quantized first gain (GAIN1); and quantize the difference ( delta ) between the logarithm of the second gain and the linear prediction.