Patent ID: 6502069
Filing Date: 2002-12-31
Classification: H04B

Abstract:
A method for coding discrete first time signals which have been sampled with a first sampling rate, comprising the following steps:generating second time signals, whose bandwidth corresponds to a second sampling rate, from the first time signals, the second sampling rate being equal to or less than the first sampling rate; coding the second time signals according to a first coding algorithm to obtain coded second signals; decoding the coded second signals according to the first coding algorithm to obtain coded/decoded second time signals whose bandwidth corresponds to the second sampling frequency; transforming the first time signals into the frequency domain to obtain first spectral values; calculating prediction coefficients from the first spectral values; generating second spectral values from coded/decoded second time signals, the second spectral values being a representation of the coded/decoded second time signals in the frequency domain; evaluating the first spectral values with the second spectral values to obtain evaluated spectral values whose number corresponds to the number of the first spectral values; performing a prediction of the evaluated spectral values over the frequency by means of the calculated prediction coefficients to obtain evaluated residual spectral values; and coding the evaluated residual spectral values according to a second coding algorithm to obtain coded evaluated residual spectral values.