Patent ID: 6601206
Filing Date: 2003-07-29
Classification: H03M

Abstract:
A method of introducing increased redundancy into a discrete signal for the purpose of error concealment or correction of bursty and/or frame losses comprising:forming the discrete Fourier transform of a block of samples of said signal; modifying said Fourier transform to form a block of coefficients of block length N in which a predetermined set of M Fourier coefficients are equal to zero; and forming the inverse discrete Fourier transform of said block of Fourier coefficients to form the increased-redundancy signal; CHARACTERISED IN THAT said predetermined set of Fourier coefficients consists of the coefficients numbered p(k) where k takes on M successive integer values, p(k) being defined as p(k)=pk mod N where p is a positive integer, greater than unity, relatively prime to N.