Subject:What is Anti-Alias filtering

Posted by: Eniregnat

Date:9/12/2001 2:28:26 PM

What is Anti-Alias filtering?
What is an alias?
How does it make my sound better to remove it?
I am looking this up in the manual, but I
was hopeing to find a quicker answer.

Subject:RE: What is Anti-Alias filtering

Reply by: LanceL

Date:9/12/2001 4:53:18 PM

Antialias filtering is a means of applying a lowpass filter to audio that you're downsampling. When you downsample, the higher frequencies can become lower frequency noise (since, in a manner of speaking they have nowhere to go when you're reducing the sample rate of the audio). This helps to rid some of that noise from becoming part of the downsampled sound.

Subject:RE: What is Anti-Alias filtering

Reply by: Eniregnat

Date:9/12/2001 5:16:54 PM

I have to take recordings that were recorded at 22050 to 44,100 for CD recording. I know that this does not improve the quality of the recording.
I now know that I do not have to worry about high-frequency sound becomming low frequency noise.

Thanks!