If something is removing certain frequencies but allowing other through, this would change the soundwaves that reach our ear and thus change the pitch?This is part of altering the resonance but I don't see how it would change the pitch.
Actually there's both imho: [1] [2] [3]OMG it's damping not dampening! You guys are killing me!
Sorry, I don't understand what you mean in this context.I forget the details, but think in terms of how the wavelengths of various sound wave frequencies affects their absorption.
Good point, although it worked with the bare hand, too, so I was able to ensure the head wasn't touching my hand while vibrating.Probably with just a 2 mm rise the vibrating head sporadically does touch the head
Which would happen because of air pressure between the head and the dampener, reducing the ability to vibrate, my current guess what's going on there.reflected waves stifle the head at that point changing the whole dynamic of head vibration.
Also good point, I'll test this by mounting it facing away from the drum. But it wouldn't explain the effect using my hand with nothing mounted to the hoop.I wonder if just adding mass to the rim is changing it? Like adding hardware does.
You also have a point, will test it like outlined above. But this also wouldn't explain the effect with the hand.I'm guessing it took some ring out of the hoop. It would dampen the hoops vibration. The sound would be affected.
A (poor) illustration: let's imagine we have a snare drum covering the following spectrumIf something is removing certain frequencies but allowing other through, this would change the soundwaves that reach our ear and thus change the pitch?
This is a poor example, but hear me out. Say the drum is producing 50% high frequencies and 50% low. If the damper is catching 50% of the high frequencies, your ear is now receiving half the highs and all the lows. In essence, your ear was receiving a 1:1 high/low mix, and now your ear is receiving a 1:2 high/low mix. I would imagine this has something to do with the change in pitch.
I don't either....Sorry, I don't understand what you mean in this context.....
Well, in this case all translation services I'm aware of are using the wrong version then. It wouldn't be helpful to post links since there's not too many German speakers here I guess. But in German dampening/damping basically is "Dämpfung" (reducing vibration of whatever) compared to "Durchfeuchtung" (making things wet). My go-to translators offer things like:Super...I have to think that the examples you provided were examples of the wrong usage of that word. I don't know for sure, that's a guess. But I do suspect it
I see the wrong usage of that word EVERYWHERE
My poor illustration is more what I'm talking about. Keep in mind I'm just thinking out loud, not disagreeing:A (poor) illustration
What you're describing in terms of sound absorption is somewhat related, since the Gibraltar thingy also reduced the resonance of the drum. But it has nothing to do with changes in pitch.I don't either
It's complicated. Probably a good area for GetAgrippa to explore.
It's been a long time since I had any acoustics classes, but I was thinking in terms of sound absorption and reflection.
What you described sounds like a miniature example of what's done in prepping a room to use as a studio.
Essentially, a small baffle is absorbing and reflecting different frequencies.
Also the position of the baffle, the drum, and your head will affect binaural perception.
Maybe someone else can dig into it. Here's a couple for starters:
Wavelength - Wikipedia
en.wikipedia.org
Of course, the second link is referring to mics, but if you disregard the electronic aspect,
the purely physical aspect of a block/baffle might have a similar effect on frequencies.
Thanks for the drawing and for wrapping your head around it! What has to happen in order to change the pitch is that the waves you draw are somewhat elongated. To rely on your drawing maybe like this (blue: original, pink: lowered pitch):My poor illustration is more what I'm talking about. Keep in mind I'm just thinking out loud, not disagreeing:
Oh, I see what you are saying. I'm out of ideas then, as its not moving so it isnt the doppler effect, and I dont think reflection can change the wavelength.Thanks for the drawing and for wrapping your head around it! What has to happen in order to change the pitch is that the waves you draw are somewhat elongated. To rely on your drawing maybe like this (blue: original, pink: lowered pitch):
View attachment 109581
Agreed, but the affect observed is in addition to anything attributed to doppler.Adding movement is a different effect called Doppler. Since you're moving away from your ears the pitch would get lower while in motion, same as sirens.
Probably not, but it can affect perceived sound, & certainly influence how the membrane behaves in sympathetic response.Oh, I see what you are saying. I'm out of ideas then, as its not moving so it isnt the doppler effect, and I dont think reflection can change the wavelength.
As I said - I also tested it with my bare hand, nothing mounted to the drum. I felt the slightest contact between vibrating head and skin, so I'm sure absolutely nothing touched the head, although the pitch changed.I think the damper IS actually coming into contact with the head as the head oscillates