What is this voovoo thing?

[Salmon Egg]

I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?

Bill

[Ken Plotkin]

On Wed, 16 Jun 2010 04:05:18 -0700, Salmon Egg

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?
Bill

There are a lot of them. As far as 127 dB goes...in one TV news
report I saw they had the microphone just a couple of inches from the
mouth.

Ken Plotkin

[Ralf Fassel]

* Ken Plotkin <***@nospam-cox.net>
| [voovoo-whatever thing]
| There are a lot of them. As far as 127 dB goes...in one TV news
| report I saw they had the microphone just a couple of inches from the
| mouth.

Which would be the average distance from Vuvu to ear in a crowded area.
This is why they banned those devices from public viewing areas here in
Germany...

R'

[angevineac]

Careful with your vuvuzela!

http://www.allied360email.com/t.do?id=5201614:13812701

Dan Prusinowski




Salmon Egg wrote:


Ralf Fassel wrote:
Ken Plotkin <***@nospam-cox.net>
[voovoo-whatever thing]
There are a lot of them. As far as 127 dB goes...in one TV news | report I saw they had the
microphone just a couple of inches from the
mouth.

Which would be the average distance from Vuvu to ear in a crowded area. This is why they banned
those devices from public viewing areas here in
Germany...

R'
I have heard a lot about this voovoo-whatever thing being used as a noisemaker at the World Cup.
Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it about this device that makes
it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?

Bill

--- news://freenews.netfront.net/ - complaints: ***@netfront.net ---

[Riccardo Balistreri]

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?
Bill

Interesting on the acoustical point of view, very annoying on the TV to
see the match and I can't immagine the noise in the stadium, what kind of
idiots would use that!

[Angelo Campanella]

Post by Riccardo Balistreri

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?
Bill

Interesting on the acoustical point of view, very annoying on the TV to
see the match and I can't imagine the noise in the stadium, what kind of
idiots would use that!

A description and a few photos are to be seen at:

http://en.wikipedia.org/wiki/Vuvuzela

On the right side of that screen, there is a click button that plays
a blast from one.
Wikipedia does not tell how it works.
This phenomenon has captured the curiosity of the TV media. It's
also darn loud.

This clip (click on TV screen) relates a sound that makes me think
it's a brass mouthpiece type of instrument.


http://news.bbc.co.uk/2/hi/africa/10312794.stm

Ange

[Heinz Weissing]

I did not take any measurements myself, but the other day I watched a report
on German tv by a doctor who spoke about 110 dB (no distances, frequency
weightings and the like were mentioned). Anyway, this is still quite a lot,
and I prefer not to get too close to such an "instrument". The 110 dB appear
to be in the same order of magnitude as, for instance, a normal trumpet
played loud.

Heinz

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?
Bill
--
An old man would be better off never having been born.

[Peter Larsen]

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?

Trombone played by unskilled operator 140+ dB at one meter measured with a
Bruel and Kjaer peak hold sound level meter by a friend of mine in 1978 or
79.

At the Vuvuzela sound level you would need earplugs AND earmuffs for
reasonable protection just as on a hangarship or on the grandstands at a F1
grand prix or between printing units of a large web offset press running at
speed. The guys on the hangarships that also have comms in their earmuffs
then with a reasonable amount of likelyhood get their hearing damage from
the vox instead if they don't get - actually not at all improbable - via
bone conduct, the skull is only good for some 40 to 45 dB attenuation,
assuming mouth - and eustachian tubes - closed.

Post by Salmon Egg
Bill

Kind regards

Peter Larsen

[Angelo Campanella]

Post by Peter Larsen

Post by Salmon Egg
I have heard a lot about this voovoo-whatever thing being used as a
noisemaker at the World Cup. Just what is this device from an acoustic
point of view. It is reported as being at level of 127 dB. What is it
about this device that makes it so loud? Why would a regular horn such
as a trumpet or trombone not be able to produce as loud a sound?

Trombone played by unskilled operator 140+ dB at one meter measured with a
Bruel and Kjaer peak hold sound level meter by a friend of mine in 1978 or
79.

This Vuvu is just a cheap plastic trumpet sans keys. As any band member
knows, the one thing you DO NOT want to do is to be right next to or in
front of a trumpet - or any other mouthpiece ("brass") instrument - that is
being blown by anyone else. Soccer and any sports stands packs fans very
close to one another. Any fan can carry a device like that into the stands.
It's an accident (hering loss) ready to happen that fan A blows the vuvu
right next to fan B's ears...

Post by Peter Larsen
At the Vuvuzela sound level you would need earplugs AND earmuffs for
reasonable protection just as on a hangarship or on the grandstands at a
F1 grand prix or between printing units of a large web offset press
running at speed. The guys on the hangarships that also have comms in
their earmuffs then with a reasonable amount of likelyhood get their
hearing damage from the vox instead if they don't get - actually not at
all improbable - via bone conduct, the skull is only good for some 40 to
45 dB attenuation, assuming mouth - and eustachian tubes - closed.

Right on!

Ange

[M J Carley]

Post by Angelo Campanella
This Vuvu is just a cheap plastic trumpet sans keys. As any band
member knows, the one thing you DO NOT want to do is to be right next
to or in front of a trumpet - or any other mouthpiece ("brass")
instrument - that is being blown by anyone else. Soccer and any
sports stands packs fans very close to one another. Any fan can carry
a device like that into the stands. It's an accident (hering loss)
ready to happen that fan A blows the vuvu right next to fan B's
ears...

See:

http://www.scielo.org.za/scielo.php?pid=S0256-95742010000200015&script=sci_arttext
http://www.scielo.org.za/scielo.php?pid=S0256-95742010000400003&script=sci_arttext
http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S0256-95742010000400024&lng=en&nrm=iso