[sdiy] 233 Hz Notch Filter

[Donald Tillman]

On Jul 3, 2010, at 5:27 PM, Tim Parkhurst wrote:

> Okay, maybe unrelated to pretty much anything, but this chap has
> written a notch filter in LabView for removing the fundamental
> frequency of a Vuvuleza from broadcasts and recordings:
> http://decibel.ni.com/content/blogs/Simon/2010/06/16/world-cup-2010--filtering-the-annoying-vuvuzela-noise
> 
> I love it when science helps make our lives better ;)


(Yeah right, Tim; like you didn't bring a batch of Vuvuzelas into work a few days ago.  :-) Congratulations on that by the way!)

I was under the impression that the broadcasters had started turning down the crowd mics and inserting notch filters into the audio paths after the first few days.  'Pure self interest; the production staff was probably wigging out and the stations certainly don't want to be driving their audience away.

I suppose you could also try a masking approach: start with a pink noise source, filter out the Vuvuzela frequencies from the noise, and mix that with the audio signal.

By the way, you can buy Vuvuzelas on Amazon easily enough.   (Do a search.)  They're very inexpensive.  Synth controllers, anybody?

  -- Don

--
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com