1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Anti-Aliasing Filter

  1. Sep 21, 2006 #1
    Hi,

    Can anyone tell me what an anti-aliasing filter is and how it is used?

    regards,

    meldave
     
  2. jcsd
  3. Sep 21, 2006 #2

    chroot

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Aliasing is an undesired effect in the use of analog-to-digital converters. Frequency components above the the Nyquist band (above half the sampling frequency) get "mirrored" into lower frequencies inside the Nyquist band. Once a high frequency has been aliased, there is no way to distinguish it from a real low-frequency signal.

    An anti-aliasing filter is a low-pass filter, put before the ADC, that attenuates frequency components above the Nyquist band.

    - Warren
     
  4. Sep 22, 2006 #3
    Thanks. I appreciate it.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?