b13 Posted August 13 Share Posted August 13 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. Link to comment Share on other sites More sharing options...
b13 Posted August 13 Author Share Posted August 13 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. Link to comment Share on other sites More sharing options...
David Lay Posted August 13 Share Posted August 13 I learned to not play in front of a rotating fan due to the interference from refections off of the fan's blades.. Link to comment Share on other sites More sharing options...
b13 Posted August 14 Author Share Posted August 14 So is there a physically influence from the Ventilator to the swinging reeds or is it a subjective (or also physically) matter with hearing? Link to comment Share on other sites More sharing options...
David Lay Posted August 14 Share Posted August 14 Physics - not just perception. Link to comment Share on other sites More sharing options...
David Barnert Posted August 14 Share Posted August 14 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. Link to comment Share on other sites More sharing options...
SIMON GABRIELOW Posted August 14 Share Posted August 14 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! Link to comment Share on other sites More sharing options...
Matthew Heumann Posted August 14 Share Posted August 14 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. 2 Link to comment Share on other sites More sharing options...
b13 Posted August 14 Author Share Posted August 14 (edited) 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 by b13 Link to comment Share on other sites More sharing options...
Stephen Chambers Posted August 15 Share Posted August 15 There's been a lot of discussion of such phenomena over the years, a key search term would be "doppler". Link to comment Share on other sites More sharing options...
David Barnert Posted August 15 Share Posted August 15 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. Link to comment Share on other sites More sharing options...
Stephen Chambers Posted August 15 Share Posted August 15 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. Link to comment Share on other sites More sharing options...
b13 Posted August 15 Author Share Posted August 15 Stand in front of the running Ventilator and sing „Aaaah“ into the airstream. It seems the same „Effekt“. Link to comment Share on other sites More sharing options...
d.elliott Posted August 15 Share Posted August 15 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. 1 Link to comment Share on other sites More sharing options...
David Barnert Posted August 15 Share Posted August 15 10 hours ago, Stephen Chambers said: I know that David... Sorry, I didn’t mean to suggest otherwise. Link to comment Share on other sites More sharing options...
Frank Edgley Posted August 16 Share Posted August 16 I definitely does not harm the reeds. Link to comment Share on other sites More sharing options...
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