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sal-fartosy1-Visitor
1-Visitor
September 3, 2015
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Signal averaging with Mathcad14

  • September 3, 2015
  • 24 replies
  • 10188 views

Hello everyone,

Please I want to know the way of using the signal averaging in Mathcad 14. I have three signal tests and I want to do averaging for their spectrum. Please if anyone have an experience with that I will be so grateful to email me on " -" with any useful information.

Best Regards

Best answer by StuartBruff

sabah al-fartosy wrote:

So, do you have the best way to do the averaging for the signals, I mean the steps in Mathcad.

Best way?  Depends upon how generalized you wish to make the worksheet (eg, how many data sets you want to analyze).  Assuming a one-off, this is a simple method:

Stuart

24 replies

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StuartBruff23-Emerald V
23-Emerald V
September 3, 2015

sabah al-fartosy wrote:

Hello everyone,

Please I want to know the way of using the signal averaging in Mathcad 14. I have three signal tests and I want to do averaging for their spectrum. Please if anyone have an experience with that I will be so grateful to email me on " -" with any useful information.

It's usual to post information within the Mathcad Community rather than email people.   That way you can get a variety of thoughts and advice on any Mathcad-related subject, and it also helps others who may have similar problems.    A quick web search on "signal averaging in Mathacad" (duck-duck-go rather than google) reveals several useful webpages, including this one:cips.colorado.edu/mathcad/12_Circuit_Signal_Averaging.pdf

Stuart

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    RichardJ19-Tanzanite
    19-Tanzanite
    September 3, 2015

    If you want to average N signals just add them, and divide the result by N. Or is there something more involved about what you want to do?

    As Stuart has said, nobody is likely to email you with an answer. Answers to forum questions are posted to the forums. There are three main reasons for this:

    1) Others can possibly benefit from the answer

    2) We don't like to spend time answering a question that someone else has already answered, and with private emails there is no way to know whether the question has been answered.

    3) Generally, most of us don't like to give out our private email addresses.

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      StuartBruff23-Emerald V
      23-Emerald V
      September 3, 2015

      Richard Jackson wrote:

      If you want to average N signals just add them, and divide the result by N. Or is there something more involved about what you want to do?

      As Stuart has said, nobody is likely to email you with an answer. Answers to forum questions are posted to the forums. There are three main reasons for this:

      1) Others can possibly benefit from the answer

      2) We don't like to spend time answering a question that someone else has already answered, and with private emails there is no way to know whether the question has been answered.

      3) Generally, most of us don't like to give out our private email addresses.

      I suspect, given that the original message mentioned the spectrum, Sabah may want to average the FFTs rather than the average the signals and then take the FFT.

      Stuart

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      RichardJ19-Tanzanite
      19-Tanzanite
      September 4, 2015

      I assumed he already had the spectra, because he only asked about averaging, not how to get spectra from a time domain signal

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      sal-fartosy1-VisitorAuthor
      1-Visitor
      September 3, 2015

      Hello my friends,

      I am so sorry to be rude by putting my email. This is my first comment and I thought it will be easy to communicate with others. I am really thankful for your valuable comments and I agree with both that other need to share the same information.

      Best Regards,

      Sabah

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      VladimirN24-Ruby IV
      24-Ruby IV
      September 4, 2015

      Hi Sabah,

      You will also be useful to see a built Mathcad package extensions "Signal Processing" (in main programm menu select "Help" --> "E-books" --> "Signal Processing'').

      Pic_1.png

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        sal-fartosy1-VisitorAuthor
        1-Visitor
        September 4, 2015

        Thank you my friends for your comments. Actually, the mean goal of my question is to get the steps that I should follow up in order to determine the average of three frequency spectrum signals in Mathcad 14. So I want to see if any one have an experience in this topic which can be helpful to me to do this process,

        Best Regards,

        R
        RichardJ19-Tanzanite
        19-Tanzanite
        September 4, 2015

        We need more information. Do you have the signals already in Mathcad? Do you need to read them from files? if so, what's the file format? Are the frequency axes for the three signals identical, or are there registration issues that have to be dealt with? Doing this in Mathcad is not difficult, but without more information it's hard to give you any useful advice.

        Even better, can you attach a file (or files) containing the spectra? (Click on "Use advanced editor" at the top right of the edit dialog)

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          sal-fartosy1-VisitorAuthor
          1-Visitor
          September 4, 2015

          Hello Richard,

          Thank you so much for your post. The signals are processed already inside the Mathcad and I did all operations for them (removing DC components, Zero-padding and else). The signals have the same length for both time and frequency domains. As I mentioned in my previous post I want to learn the procedure to averaging the signals in Mathcad 14 ( Mathematical expressions). Also, I have last question is the averaging can be did before and after the fft or its restricted for a certain case.

          Best Regards,

          Sabah

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