Patent ID: 8924202
Filing Date: 2014-12-30
Classification: G10L,H03M

Abstract:
1. An apparatus comprising: at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least: model a vector of coefficients of a speech signal to estimate at least one distribution of the vector of coefficients of the speech signal; rotate the vector of coefficients of the speech signal with respect to a lattice, for lattice quantization of the vector of coefficients of the speech signal, dependent on the at least one distribution, wherein the rotation is selected to align a densest direction of the lattice with a denser direction of the vector of coefficients of the speech signal; said apparatus configured to determine the denser direction of the vector of coefficients of the speech signal by applying a mixture of Gaussian model to the vector of coefficients of the speech signal; and quantize the vector of coefficients of the speech signal rotated with respect to the lattice.