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The way to do FIR filter.

Discussion in 'Electronic Basics' started by boki, Jun 5, 2004.

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  1. boki

    boki Guest

    I found there are two method to do FIR.

    A. find the coefficient from fourier series.
    B. Window method.

    My thinking about A.

    1. Use fourier series to contribute a desire filter curv(ac response)
    2. find fourier series
    3. convolution signal with series
    4. Get the FIR.

    I am correct?

    Thank you very much.

    Best regards,

  2. Bob Masta

    Bob Masta Guest

    Almost. You find the Fourier series for the
    filter, then do an inverse Fourier transform to
    get the time-domain impulse response of the
    filter. That impulse response is itself the
    FIR tap weights.

    But unless you need a lot of control over the
    exact shape, the window method is a lot

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
  3. boki

    boki Guest

    Thanks for the way.

    Best regards,
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