Patent ID: 7003448
Filing Date: 2006-02-21
Classification: G10L

Abstract:
1. A method for concealing an error in an encoded audio signal, where the encoded audio signal has successive sets of spectral coefficients, where a set of spectral coefficients is a spectral representation for a set of audio sampled values, comprising the following steps: subdividing a current set of spectral coefficients into at least two sub-bands with different frequency ranges, where one sub-band of the at least two sub-bands has at least two spectral coefficients; reverse transforming the spectral coefficients of the one sub-band to obtain a temporal representation of the at least two spectral coefficients of the one sub-band; performing a prediction using the temporal representation of the at least two spectral coefficients of the one sub-band to obtain an estimated temporal representation for a sub-band of a set following the current set, where the sub-band of the following set has the same frequency range as the sub-band of the current set; forward transforming the estimated temporal representation to obtain at least two estimated spectral coefficients for the sub-band of the following set; determining whether a spectral coefficient of the sub-band of the following set is erroneous; and as reaction to the step of determining, if there is an erroneous spectral coefficient, using an estimated spectral coefficient instead of an erroneous spectral coefficient of the following set so as to conceal the erroneous spectral coefficient of the following set.