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inverse filtering?

Discussion in 'Electronic Design' started by sperelat, Sep 10, 2007.

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  1. sperelat

    sperelat Guest

    I do time-domain simulation of signal that passed electronic filters.
    Now, my task is reconstructing original signal with signals that
    passed filter

    To get inverse filgering ,I reversed transfer function, but it makes
    error.

    What did I have to do to get inverse filtering?
     
  2. MooseFET

    MooseFET Guest


    You may be asking the imposible. Check that the tranfer function of
    the filter doesn't have any zeros (notches). If the amplitude of any
    frequency component is multiplied by zero, the information is gone.

    Next you need to look carefully at the phase shift. The output of a
    filter can never contain information from the future of its input.
    The entire output must be delayed so that this is not needed.

    Lastly you have to consider accuracy and noise issues. It doesn't
    take much of an error in the cut off frequency to make quite a
    significant error in the cancelation.
     
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