Patent ID: 8473288
Filing Date: 2013-06-25
Classification: G10L

Abstract:
1. A quantizing apparatus that quantizes a value related to transformation coefficients upon performing a principal component analysis transformation of a first vector signal and a second vector signal, the apparatus comprising: at least one processor and memory; a power and correlation calculator that calculates power of the first vector signal, power of the second vector signal and a correlation value between the first vector signal and the second vector signal; an intermediate value calculator that calculates, as an intermediate value, a result of performing a difference computation using the power of the first vector signal and the power of the second vector signal; a codebook that holds a plurality of numbered pairs of a first coefficient and a second coefficient, which are related to the transformation coefficients; and a quantizer that calculates, as a reference value, an addition result of a first multiplication result acquired by multiplying the first coefficient by the correlation value and a second multiplication value acquired by multiplying the second coefficient by the intermediate value, and, based on magnitude of the reference value, selects an index number of a numbered pair of a first coefficient and a second coefficient in the codebook as a code.