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  1. rh142

    Digital Filter Software

    Noway2, I am more interested in the wave shape, which is why I was wondering about backwards filtering to reduce the effects of time delay and phase shift. I created a filter in octave using the butter (generates the b and a arrays) and filtfilt (which does forward and backwards filtering). I...
  2. rh142

    Digital Filter Software

    Skogsgurra, FFT or filter? Assuming filter, I should flip the filtered response then filter again. Then flip it back? Is this my final filtered response or do I need to add it to the first filtered response and average. Thanks, rh142
  3. rh142

    Digital Filter Software

    Greglocok, Thanks, Octave was already available on our system since we have red hat. So I was able to use it. I am following a published paper for the analysis and filter they used is an 8th order butterworth filter, so I want to use an 8th order butterworth filter. The paper also states...
  4. rh142

    Digital Filter Software

    macgyvers2000, To clarify a little more. I am a structural engineer and the "signal" I want to filter is from a numerical analysis which is giving time vs acceleration data. The data is in two columns with sampling rate of 10,000 Hz and the cutoff frequency I want to use is 180 Hz. Thanks...
  5. rh142

    Digital Filter Software

    What is the best software to do filter. I need create an 8th order low pass butterworth filter. Also from what I remember from by signal processing class (which was a long time ago) that filtering causes a time delay and phase shift. What is the best way of eliminating it or reduce the...

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