High quality speech coder and coding method

Abstract From the Canadian patent

A first coefficient generating unit, derives from past reproduced speech signal, a first coefficient signal representing a spectral characteristic of the past reproduced speech signal. A residual signal generating unit derives from, speech signal for each frame, a predicted residue signal by using the first coefficients. A second coefficient generator derives second, coefficients representing a spectral characteristic of the predicted residue signal. A second coefficient quantizing unit quantizes the second coefficients and provides a quantized coefficient signal. An excitation quantizing unit derives an excitation signal concerning the speech signal by using the speech signal, the first …