Filtering the Vuvuzela
For those of you that are stuck in a cave somewhere, you might not have been introduced to the maddening vuvuzela horn that is being used by rabid fans in the 2010 FIFA World Cup. (This is soccer to all the Americans). German fan and engineer Tobias Herre came up with a solution to digitally filter out the vuvuzela sounds from his TV. By filtering out the B flat note using a channel EQ to build a notch filter around 233Hz, 466Hz, 932Hz and 1864Hz in real time, he is able to hear the game without the maddening vuvuzela sounds. You can search on Youtube for the sound of ten thousand vuvuzelas going at once, but some people describe it as a bee hive inside your head.