Anti-Aliasing Filter

  • Thread starter meldave00
  • Start date
  • #1
39
0
Hi,

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

regards,

meldave
 

Answers and Replies

  • #2
chroot
Staff Emeritus
Science Advisor
Gold Member
10,239
37
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
 
  • #3
39
0
Thanks. I appreciate it.
 

Related Threads on Anti-Aliasing Filter

Replies
8
Views
2K
  • Last Post
Replies
10
Views
189
Replies
4
Views
2K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
11
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
2
Views
670
Top