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

[Jeff Brower]

Alex-

> 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 
> NOT
> 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:

 
ftp://ftp.prenhall.com/pub/esm/electrical_and_computer_engineering.s-045/oppenheim/DTSP/errata1pph.pdf

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

-Jeff