Patent Document ID: 20020078112
Application ID: 09972994
Patent Flag: 0

Claim One:
1. Filtering method adapted to transform an input digital signal (x n ) into one or more output digital signals (y n ) having even-indexed samples (y 2n ) and odd-indexed samples (y 2n&plus;1 ), said method including at least one iteration ( 506 ) which contains an operation of modifying even-indexed samples (y 2n ) by a function (R) of weighted odd-indexed samples (&agr; 0,j ·y 2n&plus;m j ), an operation of modifying odd-indexed samples (y 2n&plus;1 ) by a function (R) of weighted even-indexed samples &bgr; 0,j ·(y 2n −y 2n&plus;2 )), said weighted samples being obtained by at least one weighting operation, said method being characterised in that at least one of said weighting operations is applied to the difference between two consecutive even-indexed samples.