The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Sine Wave Samplig at Nyquist rate.
Replies: 4   Last Post: Apr 11, 2013 1:00 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Greg Heath

Posts: 6,387
Registered: 12/7/04
Re: Sine Wave Samplig at Nyquist rate.
Posted: Apr 10, 2013 11:53 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Charlene " <> wrote in message <kk3of6$la8$>...
> Hey I'm Currently studying Signals and Systems and I'm a relatively new user on MATLAB. I'm Wondering How do i Sample a sine wave at Nyquist rate on MATLAB. I now how to generate a sine wave. I also need some help in its reconstruction.
> Thanks

You have to sample FASTER than the Nyquist rate.

For a sine wave the Nyquist rate is twice per period. So if you sample at t=0 and
t= T/2 , you are in trouble because A*sin(2*pi*t/T) = 0 at both places, losing any
information about A..

That is why, in important($) work you must filter all frequencies at and above the Nyquist
frequency before using frequency transform analysis

Hope this helps.


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.