![]() ![]() That's why a long skinny didge will have a lower note than the same length didge with a taper. So the same length tapered sound column will have a higher drone tone note than a simple tube. ![]() The reality of a didge is that the taper reduces the actual length of the sound column, and the faster the taper expands the more the sound column length is reduced. That's all the math that is ever going to be on this quiz. And 340 m/s divided by 4.88 equals just over 69 Hz which is C#2 for a note. (Fr = Sp / Wave) A 4 foot tube is about 1.22 meters, so 1.22 x 4 gets a 4.88 meter wavelenth. And the speed of sound (340m/s) divided by the wavelength gives the frequency. The drone wavelength is 4 times the length. Every didge is a freak of nature.Ī tube with no taper, like PVC, has a drone tone note, or Key, exactly proportional to the length, defined by the formula for the speed of sound. Trumpet tones of a didgeridoo do not follow that math at all. Those have particular overtone series that are harmonics and are mathematically related to the base note. The reason that we do not call them 2nd harmonic, 3rd harmonic, etc is that they are pretty much never multiples of the drone tone, which would be like a guitar string or a bugle bore. Slightly potentially confusing is that the drone tone is the 1st harmonic, and the trumpet tones (overtones) start with the 1st overtone for first trumpet, 2nd for second, etc. Then the bottom section forms the bell which amplifies and broadcasts the final sound. The next or middle section is a resonating chamber which gives tonal quality to the sound column. The upper chamber is the actual note-producing sound column. With the exception of PCV-like didges, which are just tubes, any quality didgeridoo has a taper to the bore, and actually is composed of 3 distinct chambers. The hard part first, cuz this is how the drone tone note is related to its length. For example most Australian didgeridoos have only one usable overtone, and some have medium back-pressure, but might have amazing volume, tone and ring tone. This is not to say that the didgeridoo with the most features wins, quite the contrary. There are one trick ponies that do a few things really well, and may be blandish otherwise. Hand-made didgeridoos have a multitude of variances that make each instrument unique, and sometimes even extremely different from all others. Modern didgeridoos are made from a variety of materials, including PVC and a wide assortment of hardwoods. They are traditionally made of a eucalyptus tree that has been naturally hollowed out by termites. Didgeridoos, native to Australia, have been around at least 1000 years.
0 Comments
Leave a Reply. |