Patent ID: 6865534
Filing Date: 2005-03-08
Classification: G10L

Abstract:
1. A speech and music signal coder for producing a reproduction signal by driving a linear prediction synthesis filter in response to an excitation signal which is provided by adding a first excitation signal corresponding to a first band of an input signal and a second excitation signal corresponding to a second band of the input signal, said linear prediction synthesis filter setting with a linear prediction coefficient calculated on the basis of said input signal, said speech and music signal coder comprising: reproduction signal generating means for reproducing a first reproduction signal by driving the linear prediction synthesis filter in response to the excitation signal corresponding to the first band; residual signal generating means for generating a residual signal by driving a linear prediction inverse filter in response to a differential signal indicative of a difference between the input signal and the first reproduction signal and; coding means for coding a component corresponding to the second band in the residual signal after orthogonal transformation of the component.