Tampere University of Technology

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Filtering method and an apparatus

Research output: PatentScientific


Original languageEnglish
Patent numberWO2004095701
IPCH03H 21/ 00 A I
Priority date22/04/03
Publication statusPublished - 4 Nov 2004
Publication typeH1 Granted patent


The invention relates to a method for filtering. In the method an adaptive filtering is performed to an input signal (x(n)). The filtered signal is further interpolated. The input signal (x(n)) is also interpolated for adapting the adaptive filtering. In the method the properties of the interpolation of the filtered signal are adaptable. The invention also relates to an apparatus (1) comprising an adaptive filter (2) for filtering an input signal (x(n)), a first interpolator (3) for interpolating the filtered signal, and a second interpolator (7) for interpolating the input signal (x(n)). The interpolated input signal is used to adapt the adaptive filter (2). The apparatus (1) further comprises a first adapting block (4) for adapting the properties of the first interpolator (3).