In the sine wave source is the formula that links samples per period and sample time correct? It says: Samples per period = 2*pi / (Frequency * Sample time), but I believe it should be Samples per period = Sample time / Frequency.

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  1 Comment
Srikar
Srikar on 18 Feb 2021
Hi do you think Samples per period = Sample time / Frequency will balance the units ? sample time is in sec and Frequency in hertz (hertz is 1/sec) in that case your equation will end up having samples as sec2. I think the Math equation is right.

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Answers (1)

David Goodmanson
David Goodmanson on 19 Feb 2021
Hello Ilaria,
I believe it is neither of those. Rather it is what is in the PNG with the 2pi crossed out:
samples/period = 1/(frequency*sample time)
since frequency = cycles/sec, period = sec/cycle =1/frequency
# samples = period/sample time = 1/(frequency*sample time)
  3 Comments
Daniele Ferretti
Daniele Ferretti on 29 May 2022
Edited: Daniele Ferretti on 30 May 2022
So the correct formula probably is : frequency*sample time
units measure : [frequency] = Hz , [sample time] = Seconds
David Goodmanson
David Goodmanson on 6 Jun 2022
It's
number_of_ samples = 1/(sample_time * frequency) in which case
number_of_samples * sample_time = 1/frequency = period which is correct

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