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US 5,970,442 AGranted
Gain quantization in analysis-by-synthesis linear predicted speech coding using linear intercodebook logarithmic gain prediction
AssigneeTelefonaktiebolaget LM Ericsson
InventorYlva Timner
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Abstract
A gain quantization method, in analysis-by-synthesis linear predictive speech coding, includes these steps: determine a first gain for an optimal excitation vector from a first code book; quantize the first gain; determine an optimal second gain for an optimal excitation vector from a second code book; determine a linear prediction of the logarithm of the second gain from the quantized first gain; and quantize the difference between the logarithm of the second gain and the linear prediction.
Claims11
A gain quantization method for excitations in analysis-by-synthesis linear predictive speech coding, comprising the steps of:
- determining an optimal first gain for an optimal first vector from a first code book;
- quantizing said optimal first gain;
- determining an optimal second gain for an optimal second vector from a second code book;
- determining a first linear prediction of the logarithm of said optimal second gain from at least said quantized optimal first gain;
- and
- quantizing a first difference between the logarithm of said optimal second gain and said first linear prediction.
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