Patent ID: 9123334
Filing Date: 2015-09-01
Classification: G10L

Abstract:
1. A vector quantization apparatus comprising: a first vector calculator that calculates, using a processor, a first reference vector by applying a parameter related to a speech spectrum characteristic to a target vector to be encoded, and transmits the first reference vector to both a second vector calculator and a polarity selector; a matrix calculator that calculates a reference matrix by matrix calculation using the parameter; the second vector calculator that calculates a second reference vector by multiplying the first reference vector by a filter having a high-pass characteristic; the polarity selector that generates a polarity vector based on a polarity of each element of the second reference vector, and generates an adjusted first reference vector by multiplying the first reference vector by the polarity vector, and generates an adjusted reference matrix by multiplying the reference matrix by the polarity vector; and a pulse position searcher that searches for an optimal pulse position using the adjusted first reference vector and the adjusted reference matrix.