Saturday, 15 August 2015

filters - Remove a frequency and all its multiple (harmonics)


In a soundfile, I'd like to remove a frequency and all its harmonics. What is the best solution in your opinion ?




  1. Do a loop with 20 notch filters, one after another.



    // f is the fundamental frequency

    for (i=0; i++; i<21)
    {
    file.notchfilter(f*i);
    }

    Question : does each notch filter create some unwanted side-effects, and the fact that we use 20 filters one after another will create very high unwanted artefacts?


  2. Is it possible to design a filter that will remove 20 frequencies in ONE STEP ? Then we wouldn't need to do a loop, just one pass wil be okay? Is it called a Comb filter ?





  3. Other method ?






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