Modification of codewords in dictionary used for efficient coding of digital media spectral data

Abstract From the Canadian patent

Coding of spectral data by representing certain portions of the spectral data as a scaled version of a code-vector, where the code-vector is chosen from either a fixed predetermined codebook or a codebook taken from a baseband. Various optional features are described for modifying the code-vectors in the codebook according to some rules which allow the code-vector to better represent the data they are modeling. The code-vector modification comprises a linear or non-linear transform of one or more code-vectors such as, by , exponentiation, negation reversing, or combining elements from plural codevectors.