1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help on estimation the gradient of a sigal sequence

  1. Jul 27, 2006 #1
    Dear All,

    I have a signal, which is a time series from measuring some quantity. The trend of the signal is decreasing. However, due to noise, the signal is fluctuating. Is there some method to get a good estimation of the gradient of the signal, i.e. the average reduction of the quantity? Thanks a lot!

  2. jcsd
  3. Aug 1, 2006 #2


    User Avatar

    Staff: Mentor

    The easiest would be to do a least-squares fit of a curve to the data. You can even do that in Excel -- just use the online Help function in Excel to guide you through the process.

    Another way would be to characterize the spectrum of the noise versus the signal, and do a digital filter of the data to improve your signal-to-noise ratio. "Designing Digital Filters" by Williams is an excellent introductory book to DSP.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Help on estimation the gradient of a sigal sequence