Sound cracks by passing a Ventilator

[b13]

If you pass the airstream of a Ventilator while playing the Concertina the sound changes into some kind of damaged. I guess this results by blowing away the waves on the way to the ears.

[b13]

I do not think, there where any negative influences to the tongues of the Instrument. This is a „accident“ that happens outside of the Concertina. 

[David Lay]

I learned to not play in front of a rotating fan due to the interference from refections off of the fan's blades..

[b13]

So is there a physically influence from the Ventilator to the swinging reeds or is it a subjective (or also physically) matter with hearing?

[David Lay]

Physics - not just perception.

[David Barnert]

20 hours ago, b13 said:

If you pass the airstream of a Ventilator while playing the Concertina the sound changes into some kind of damaged.

17 hours ago, David Lay said:

I learned to not play in front of a rotating fan due to the interference from refections off of the fan's blades..

 

Both the ventilator and the fan blades create pulsatile air pressure changes all over, including at the reed. Reeds vibrate differently in different pressures.

[SIMON GABRIELOW]

It's like the effect you get when maybe a siren can be heard or even more a low flying plane goes over with deep hum ... And if you play instrument, at same time, you can get the strange clashing of tones!

[Matt Heumann]

Strictly physics as stated. Any oscillations or vibrations can turn even the sweetest free reed into a kazoo. When Frank Edgley & I used to travel cross country, he'd often play concertina in the car which, despite his superb playing  combined with the vibrations from the engine made tones not unlike stepping on a cat. Even the humming of refrigerator compressors can throw the acoustics off.

[b13]

I think, this Natural „Distortion“-Effekt does not start at the reeds, it is modulated outside of the Instrument, on the way throu the „wrong“ airstream of the ventilator. Outside of this airstream it Sounds normal. 
 

therefore the reeds will not take damages by trying this. In my opinion. 😉
 

I dont think, it would be a „manipulation“ of the wave (heared sound) by another wave (siren or plane-example). Take 2 sametuned concertinas playing the Same note. Only if exactly the same tuning there will be a propper tone without modulation (german:Schwebeton). Here one wave modulates the other. I think, this does not happen here. 
 

Maybe i would compare with a noise that is been taken away by a Storm. The air is „modulated“ and with it the Sound/noise, which is „flying“ in it. 

Edited August 14, 2024 by b13

[Stephen Chambers]

There's been a lot of discussion of such phenomena over the years, a key search term would be "doppler".

[David Barnert]

2 hours ago, Stephen Chambers said:

There's been a lot of discussion of such phenomena over the years, a key search term would be "doppler".

 

Agreed, even though the observed phenomenon has nothing to do with the Doppler Effect.

[Stephen Chambers]

24 minutes ago, David Barnert said:

Agreed, even though the observed phenomenon has nothing to do with the Doppler Effect.

 

I know that David, but it does come up a lot in related threads.

[b13]

Stand in front of the running Ventilator and sing „Aaaah“ into the airstream. It seems the same „Effekt“. 

[d.elliott]

no not a doppler effect, more a derivative of Huygens' Wavy theory where sound waves can either add to other sound waves or partially cancel them. School Boy Physics circa 1963-5, When I wuz a lad.

[David Barnert]

10 hours ago, Stephen Chambers said:

I know that David...

 

Sorry, I didn’t mean to suggest otherwise.

[Frank Edgley]

I definitely does not harm the reeds.