High quality speech coder and coding method

Details High quality speech coder and coding method High quality speech coder and coding method

G - Physics

10

L

G10L 19/06 (2006.01)

Patent

CA 2225102

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 coefficient signal, the second coefficient signal and the quantized coefficient signal, quantizes the second source signal thus derived and provides a quantized excitation signal. A reproduced signal generating unit reproduces a speech of the pertinent frame by using the first coefficient signal, the quantized coefficient signal and the quantized excitation signal.

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