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Signals look different with different sampling frequencies

Thomas Schermer
Prodigy 80 points


Hey John,

thanks for your help! I thinks that works now.

But today i notice that if i display a graph with a different Sampling Rate HZ variable, then i got a different signal?

In the following picture i i display the signal one time with 1 Hz Sampling Rate and one time with 100 Hz Sampling Rate.

Why i got there different cycle durations?

Thanks for your awesome help!!

 

regards

thomas

  • TI__Guru**** 162895 points

    Thomas,

    I am going to split the last question into a separate thread as I will need some help on this one.

    John

     

  • TI__Genius 13045 points

    Thomas,

    Looks like you have an aliasing problem.  The period from the 100 Hz sample rate is 1.2 seconds which is more that 1/2 the 1 Hz sample rate in the first example.  You need to sample at at least 2 Hz to resolve the signal correctly if it is an aliasing problem.

    Regards.

  • in reply to TommyG
    Prodigy 80 points

    Hey,

    This sounds good, but i checked it and get the same failure.

    The more i increased the value of the Sampling Rate, the period gets lower? for example today i get for the same adjustment another values?! following i post some signal plots of the same signal but with different sampling rates and additionally my settings. The period of the signal should be 1.2 s.

     

    With 10 Hz i get the solution how i visualised it, but i don´t realize why the other outputs are different.

    Thanks a lot!

    regards

    tom