Patent ID: 8831933
Filing Date: 2014-09-09
Classification: G10L

Abstract:
1. An apparatus for vector quantization, said apparatus comprising: a first vector quantizer configured to receive a first input vector that has a first direction and to select a corresponding one among a plurality of first codebook vectors of a first codebook, wherein the first vector quantizer is implemented by the apparatus, and wherein the apparatus comprises hardware; a rotation matrix generator configured to generate a rotation matrix that is based on the selected first codebook vector; a multiplier configured to calculate a product of (A) a vector that has the first direction and (B) the rotation matrix to produce a rotated vector that has a second direction that is different than the first direction; and a second vector quantizer configured to receive a second input vector that has the second direction and to select a corresponding one among a plurality of second codebook vectors of a second codebook.