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Re: [Discuss-gnuradio] Hello everyone. I am a new here. I have someques

From: Jeff Brower
Subject: Re: [Discuss-gnuradio] Hello everyone. I am a new here. I have somequestions.
Date: Fri, 21 Mar 2008 13:01:09 -0600


> I was posting to GNURadio about an year ago but I got busy and then I 
> stopped. I
> have again started reading about GNURadio and hope to devote my free time this
> entire year on GNURadio.
> So I have started reading Discrete Time Signal Processing by Oppenheim / 
> Schafer /
> Buck.
> Chapter 4/ Page 168 says : -
> x_s(t)=x_c(t)s(t)
>          =x_c(t) Sigma ( from n = -inf to inf ) [ delta (t-nT) ]
> Through the sifting property of the impulse function , x_s(t) can be 
> expressed as :
> x_s(t) = Sigma (from - inf to inf ) [ x_c(nT) delta ( t-nT) ]
> Now this version of the sifting property is for the DISCRETE impulse function 
> the continuous Dirac delta function, but just before the discussion starts it 
> says
> that delta(t) is the unit impulse function or the Dirac delta function. Is 
> this a
> typo ? Shouled this have been the discrete delta function? If it is'nt, how 
> do the
> above steps hold?

Well, if you have the first printing, you can check here first:


But otherwise, my comment would be... a typo in an Oppenheim & Schafer book?  9 
after being published and after countless peer reviews?  And you found it?  One 
for sure is you're not lacking audacity and enthusiasm.  Keep going.


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