Patent ID: 7283961

Claim:
A data processing device for carrying out speech processing in which prediction taps for finding prediction values of the speech of high sound quality are extracted from the synthesized sound obtained on affording linear prediction coefficients and residual signals, generated from a preset code, to a speech synthesis filter, said speech of high sound quality being higher in sound quality than said synthesized sound, and in which said prediction taps are used along with preset tap coefficients to perform preset predictive calculations to find said prediction values of said speech of high sound quality, said device comprising: a prediction tap extracting unit configured to extract from said synthesized sound said prediction taps used for predicting said speech of high sound quality, as target speech, the prediction values of which are to be found; a class tap extraction unit configured to extract a class tap, used for sorting said target speech to one of a plurality of classes, from said code, by way of classification; a classification unit configured to find the class of said target speech based on said class tap; an acquisition unit configured to acquire said preset tap coefficients associated with the class of said target speech from among a plurality of tap coefficients as found on learning from class to class; and a prediction unit configured to determine said prediction values of said target speech using said prediction taps and said preset tap coefficients associated with said class of said target speech.