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Question about 10.4 - "The Sampled Sinusoid"
New Member
January 26, 2021 - 2:54 pm
Member Since: January 26, 2021
Forum Posts: 1
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Hi all, 

I have a question about equation 10.11, page 199 (2nd edition of the FX book)...

In short, the question is: is the equation correct? Smile

It keeps puzzling me, as we are subtracting "M", which is a number of samples, from "nT" which is a value in seconds. I may be entirely missing the point, but it seems to me that equation 10.11 would work if M was a value in seconds, not number of samples. 

In order to delay by a number of samples M, the exponent should be [j * omega * T * (n - M)] rather than [j * omega (nT - M)]. 

I thought this was perhaps a typo or something, but I see that the same equation is used multiple times later on so perhaps I'm just confusing myself...

Does anybody have any thoughts to share? 

Thanks a lot! 

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