Filtering contaminants out of a sound clip

Hi,

I'm trying to filter out a contaminant from a sound clip using Matlab. It sounds kind of like a low pitched horn. I know there are a lot of built-in Matlab filters that can help with this. Could someone explain the general process.

Any help would be appreciated?

Thanks

Answer 1

[Wayne King]

Sounds like you need a highpass filter.

1. Look at the frequency content of your signal using spectrum.periodogram
2. Decide on the basis of #1, which frequencies you want to filter.
3. Design the filter using fdesign.highpass
4. filter the data using filter()

Answer 2

[bym]

maybe this will help or provide direction

http://blogs.mathworks.com/loren/2010/06/30/vuvuzela-denoising-with-parametric-equalizers/