'Anti Vuvuzela Filter' promises quieter World Cup

Jun 15, 2010

An online company has begun marketing an "Anti Vuvuzela Filter" that promises to silence the sound of the controversial plastic trumpets that have become the trademark of South Africa's World Cup.

The company's web site, antivuvuzelafilter.com, sells an MP3 audio file for 2.95 euros (3.60 dollars) that the company says will cancel the vuvuzela noise for TV viewers by producing a similar to the horn's that cancels the noise.

"Just download our specially designed vuvuzela noise cancellation MP3 and play it back on your home stereo system, computer, iPod, , etc.," the web site says.

"Depending on the circumstances, the resulting soundwave may be so faint as to be inaudible to human ears."

But Anthony Sullivan, a physicist at South Africa's Rhodes University, called the idea "a marketing hype and a waste of money."

"Noise cancelling depends on specific positions. You're not going to get that cancelling," he said.

His advice to those who don't like hearing the vuvuzela?

"Mute the TV."

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User comments : 8

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re_coyote
5 / 5 (1) Jun 15, 2010
embrace the vuvuzela and its impact on the game. showing that these players may not be the best in the world, if they cant handle a horn in the crowd
yyz
5 / 5 (1) Jun 15, 2010
Ah, but there's no money to be made in muting the TV.
PPihkala
not rated yet Jun 15, 2010
If the games would be held in a country with more 'don't hurt others' -laws, then those noisemakers would probably already be forbidden because they can threaten the hearing ability of those that are in near the usage point. But actually I don't care, because I don't watch any sports.
antialias
5 / 5 (2) Jun 15, 2010
Just download our specially designed vuvuzela noise cancellation MP3 and play it back on your home stereo system, computer, iPod, iPhone, etc


Wow - what a con. No - noise cancellation doesn't work that way. You need to be in the exact spot where the sound of the noise and the 'anti-noise' are 180° out of phase.

Since the sound in the stadium is produced by thousands of vuvuzelas with varying phase (and sometiomes pitch) you will never get the right effect by playing a static MP3-file.

What you'd need to do is:
a) analyze the sound from the TV speaker
b) CREATE the phase shifted sound on the spot
c) pour it through a loudspeaker at exactly the right distance to the listeners ear so that the two cancel out (note: for one speaker this only workd for one ear)

Try it at home. Record a random sound (say: you yelling). Record you yelling a second time and invert. Then play both - what do you hear? Exactly: the same sound at double volume - not the same sound muffled.
Bob_Kob
not rated yet Jun 16, 2010
That seems doesn't seem very practical. What you want to do is find the spectra of the signals, the vuvuzela should produce sound on pretty much the same frequency so all that is required is a stop filter over that region. Heck im sure the broadcast companies could EASILY do this is they wanted to.
antialias
not rated yet Jun 16, 2010
There's already several programs you can download if you're watching the games on a computer which will simply lower the frequencies at which the vuvuzelas are most prominent.

On your TV you should lower the bands which include the frequencies 233, 466 and 933Hz (and if you have a very fine equalizer you should augment the bands next to it slightly)

Depending on the audio compression you may be out of luck. If an MP3-like compression is used then all sounds which are 6dB lower than the vuvuzelas are not encoded at all and thus tuning out the vuvuzela frequencies might leave you with a virtually silent experience whatever you do.
antialias
not rated yet Jun 16, 2010
That said: the most annyoing thing are not the vuvuzelas but those ads around the playing fileds. I wish there was a filter for them.
croghan27
not rated yet Jun 20, 2010
Some of the football clubs have very good, talented and independently recognized choirs that sing during the games - only as loud as a voice can be. That is all too often missed in the mindless bleating of these vile horns.

Trash the lot of them.

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