Procedure and device for the transmission error coverage of digital audio signals encoded by a frequency transformation

摘要

The invention relates to a method and apparatus for transmission error concealment of coded digital audio signals. It consists in carrying out, or makes it possible to carry out discrete Fourier transformation (DFT) (101) of the samples subjected to weighting by way of the received coded coefficients y'(m,k), to obtain a DFT coefficient Y'(m,k) and in modulating the modulus of the coefficient Y'(m,k) by a sine law for the frequency, the phase of which is a linear function of the rank m of the block, thus making it possible to predict for every block of samples of rank m+1 the value of predicted coded coefficients y'p(m+1,k) on the basis of the blocks of earlier rank. Each received coded coefficient y'(m+1,k) is replaced (103) based on an error detection criterion, by the corresponding predicted coefficient y'p(m+1,k). Application to the techniques of television, radio broadcasting, phono- or video grams. IMAGE