1 2 Previous Next 26 Replies Latest reply on Jun 8, 2012 2:50 AM by user_1377889

    Problem with tuning Digital Filter 2.0

    volodymyr.hoy

       Hi!

         

      The Filter_SampleProject contains an example for the use of the Filter component. This project works properly. But if I try to change the parameters of the filter it doesn't work.

         

      For example: I want to design a Band Pass Filter with band 0.7-0.9 kHz .

         

       

         

      In the Filter_SampleProject I've changed parameters:

         

       

         

      Sample Rate [ksps]: 22

         

      Filter Stages: 1

         

      Filter Gain: 3 dB

         

      Fiter Class: FIR

         

      Filter Tipe : Band pass

         

      Window: Rectangular

         

      Filter taps: 64

         

      Centr: 0.8 kHz

         

      Bandwith: 0.2 kHz

         

      It doesn't work.

         

       

         

      If I guess (but I'm not sure!) the problem is with the Filter coherency. In the Filter_SampleProject this paraneter is : Filter_COHER_REG = 0x55;

         

      I've read Filter's Datasheet and Registers TRM but there are any information how to calculate Filter_COHER_REG.

         

      Could you help me with this problem, please?

         
              
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