Patent ID: 7269559

Claim:
A speech decoding apparatus, comprising: a decoding unit for decoding input code data into synthesized speech data; a first tap generation section for generating a class tap on the basis of the synthesized speech data; wherein the first tap generation section generates the class tap for a subject subframe of the synthesized speech data on the basis of a long-term prediction lag code separated from the coded data; a classification section for generating a class code based on the class tap; a coefficient memory for providing a tap coefficient corresponding to the class code; a second tap generation section for generating a prediction tap based on the synthesized speech data; wherein the second tap generation section generates the prediction tap for the subject subframe of the synthesized speech data on the basis of the long-term prediction lag code; a prediction section for performing a prediction computation based on the prediction tap and the tap coefficient to provide sound data; and a digital-to-analog conversion section for converting and outputting the sound data to a speaker.