Patent ID: 6157907
Filing Date: 2000-12-05
Classification: G10L

Abstract:
Transmission system comprising a transmitter with a speech encoder, said speech encoder comprising means for deriving from an input signal a symbol sequence including a representation of a plurality of prediction coefficients and a representation of an excitation signal, said representation of prediction coefficients being an untransformed representation, said transmitter being coupled via a transmission medium to a receiver with a speech decoder, said transmitter being arranged for transmitting said symbol sequence, the speech decoder comprising transformation means for deriving a transformed representation of said plurality of prediction coefficients from said untransformed representation of prediction coefficients, the speech decoder comprising interpolation means for deriving interpolated prediction coefficients from the transformed representation of the prediction coefficients, and the speech decoder being arranged for reconstructing a speech signal on basis of the interpolated prediction coefficients, said transformed representation of prediction coefficients being based on line spectral frequencies, and being more suitable for interpolation than said untransformed representation of prediction coefficients.