La physique du didgeridoo

[Utnapishtim]

Salut Juan José !

Je ne suis pas sûr d'avoir bien compris ta question... Le traducteur français de Google est assez mauvais ! If you know it, I suggest we continue this conversation in english ; it'll be far easier for us to understand you rather than struggling with an approximate french dialogue.

[jota]

I'm using the google translator I think with better English .
thanks for responding very kind , I mean creating termites irregularities such as conducting channels , internal forms , irregularities that create changes in the length of the harmonic structure , recently start making my own instruments and want to be humbly and if possible to the ring with the Australian didjeridoos seem to snore , which are garish , and that must somehow be related to the structure of the channels ( the design) , I read a lot of literature ( frank Geipel ) in which focuses on the first third of length of the didgeridoo as a determinant of timbre ( maybe I'm wrong ) is more complex and probably wanted to know the extent of the possibilities that guide me to try to get to that timbre so hard to achieve. thanks

[Ahaw]

Try and you will see for yourself...
Good thing is that it's easier and faster to craft "termite-like" than to a perfect round inside shape.
Each didgeridoo is unique, either termite-hollowed or split-n-glued.
1st third of air column sure has a big impact, but so do all of the other aspects (length, material, smoothness, density, player...)
So it's impossible to give you a straight answer... and F. Geipel's work must sure be a lot more instructive than any of our answers regarding all the time he spent in different tests... though keep in mind that as thorough as his tests might be, he may still have a looong way to go to explain the "real reality" or "totality" of the physics involved in didgeridoo sounds.

[jota]

thanks for answering, question
better quality of the resonance wall having the first third of didgeridoo 0.5 mm?
as it can get that color or timbre with Djalu didgeridoos.
the irregularity of the first third is that which affects that color?
as to achieve it, is there any particular technique?
irregularity is synonymous with channels, bumps, compression shrinking area first third channel?
what software do you recommend to test some didgeridoo simulation model
from already thank you very much closely juan jose

[Ahaw]

I'd recommend a freeware that you might already have twice : your ears
Djalu doesn't need no software, does he ?

[jota]

ahau estimated response is very suggestive of the ears but as no English and use the google translator can not correctly interpret what is said.
the questions are;
better quality of the resonance wall having the first third of didgeridoo 0.5 mm?
the irregularity of the first third is That Which Affects That Color?
as to Achieve it, is there any special technique?
irregularity is Synonymous with channels, bumps, compression shrinking area first third channel?
thank you juan jose

[Utnapishtim]

Hey Juan !

better quality of the resonance wall having the first third of didgeridoo 0.5 mm?
as it can get that color or timbre with Djalu didgeridoos.

I wouldn't say that good resonance is the typical quality of Djalu's work. Most of Djalu's yidakis have a conical bore with solid and thick walls, characteristics which tend to give a dry tone to the drone.
If you're looking for resonance, you should rather consider cylindrical (or slightly conical) instruments with thinner walls, like the magos from Western Arnhem Land. Do you know this kind of instruments ?

the irregularity of the first third is that which affects that color?

Definitely : yes. I know some didgemakers that creates little channels in the first third of their instrument to give a rounder and more organic sound (=> reduce the higher overtones) to the drone.

I don't know any software simulating precisely didgeridoo acoustic, did you try to contact Franck Geipel ? He's a specialist of that very issue and may be of some advice to you.

[jota]

Thank you very much for the answers enriching utnapitshim, maybe it's very ambitious of me to pretend to approach the sound emitted by the earth didgeridoos arhem, just try to get but so far I have not succeeded (I just want to achieve that timbre, or color particularly as they have) as all the written material that termites have a way of making the hollow irregular (and that is what determines the column of air and sound), I wanted to ask about that proportions and design used in the first section of the nozzle area, then at the middle and then the bell (if it is best done in the first part very narrow then gradually increase etc, you will know understand), there are times when it is not very smooth inside to do with irregularities.
I just want to make the bell sound is really carried by the universo.desde me and thank you for your answers atte juan jose.

[Utnapishtim]

As long as the bore of your didgeridoo is not varnished and not completely smooth, you can get a result somewhat similar to termite-eaten bore and give that "organic" feel to the drone of your instrument.
The narrow upper third (around 1 cm - 1,5 cm) rather tends to compress the drone, giving it a dry tone and reducing its resonance, making tongue techniques and hoots easier but nice overtones and cheeks techniques more complicated. Most of yidakis have a very narrow neck because Yolngu style put a lot of emphasize on strong tongued accents and hoots. But if you're looking for others way of playing, then you should consider other types of traditional instruments, like the mago I mentionned earlier.

[Ahaw]

Hi again Jota,
If you love the "ArnhemLand Didgeridoos" so much, I'd advise you to just buy one !
You would then have the "real deal" in your hands rather than a mere copy.
You must surely know how artwork copies are considered... especially from Aboriginal arts and craft and to Aboriginal people themselves (their arts and craft being a part of their cultural identity).
Once you have your real Yidaki or Mago in your hands, nothing you could craft yourself would be better, AND you would have helped an Aboriginal community by having bought your stick (more or less) directly from them and will contribute to spreading their culture throughout the world (their REAL culture, NOT an imitation).
Now if what you're looking for is to achieve a scientific-like study on the sound of the didgeridoo, then I would again advise you to buy yourself a real Yidaki or Mago (even several to have a good sample), then analyse the real deal, and only then try to simulate a copy out of local woods.
Anyways I'm looking at your request, I'd always advise you to get your hands on a real "ArnhemLand Didgeridoo".

[jota]

hellow consultation Utnapishtim The narrow upper third (around 1 cm - 1.5 cm) rather Tends to compress the drone, giving it a dry tone and Reducing its resonance (the recessed channel?) inches long because it extend? (20,30,40 cm? Then open conically)

[CarloCattanoMusic]

I'm using the google translator I think with better English .
thanks for responding very kind , I mean creating termites irregularities such as conducting channels , internal forms , irregularities that create changes in the length of the harmonic structure , recently start making my own instruments and want to be humbly and if possible to the ring with the Australian didjeridoos seem to snore , which are garish , and that must somehow be related to the structure of the channels ( the design) , I read a lot of literature ( frank Geipel ) in which focuses on the first third of length of the didgeridoo as a determinant of timbre ( maybe I'm wrong ) is more complex and probably wanted to know the extent of the possibilities that guide me to try to get to that timbre so hard to achieve. thanks

Hi , if you read Frank Geipel and you want to check yourself the harmonics you can go to Didgmo On-line version and have a check . Timber is just the different combination of harmonics , you can have a test by testing "mago" shape in DIDGmo software , then a "yidaky" shape of same lenght or pitch , then you will see the differences in harmonics wich will give different timbers. Will be nice to have a comparsion with same tone didge´s and the diferent intervals. I have been told by many crafters around the world that DIDGmo is very accurate , and if you have Linux knowledges , you can download the open source code then compile it and use, is a much more extended version than the online , that also works pretty well. Have a good day

LINK TO DIDGMO http://didgmo.sourceforge.net

[jota]

Estimated carlo, thank you very much for the response, I wanted to consult you the following, as I have to hollow out the didgeridoo for 1 st harmonic is stronger than in decibels that the drone? john thanks for replying.

[CarloCattanoMusic]

[quote="jota"]I have to hollow out the didgeridoo for 1 st harmonic is stronger than in decibels that the drone?/quote]

Try in the didgmo web an go to "online" version, then you will see a list of numbers, diameter and position, if I remember right.
Hit the button over that and you will get an example of the given parameters of a didge you want , if you didn't change anything it will show a didge by default . You can see many information about harmonics, pitch and decibels or impedance I think.
Anyway if you want a loud "toot" or 1st harmonic, I guess that a big bell style like agave ones can work fine , even too loud.

[jota]

Estimated Carlo, is to try to simulate the typical sound spectrum Yidaki that during play the drone is much smaller than the first harmonic decibels, which manufactures all didgeridoos (only four) only one of them has that feature during all other reproduction reproduce the drone louder.
paradoxically the first who manufactures is what I like and do not know how I could achieve that spectrum Yidaki, and I want to achieve something like this and the truth is not as hollow to make it that way (I think I could do randomly) and as is the sound that I really like.
That's why I consulted on how hollow the didgeridoo for the first harmonic has more decibels during the drone reproduction.
I want to convey in the best possible way which is my question , perhaps by using the online translator queries a bit confused .
when I refer to the first harmonic is higher decibel drone that I mean the intrinsic resonance of the air column , which internal channel design ( recessed ) relates more favorably towards that type sound .
I could see playing the sound of several yidakis analyzing them with a spectrum analyzer .
Another important issue that how to achieve typical sound " dirty " as achieved for example with a note that F and didgeridoo sounds woodier .

juan eternally grateful . -