How do you calculate the frequency of a termited-bored didj?
Jeff Bavis’ theory is thus: “Frequency is ‘normally’ 1/Time. In the case of a termite didg this needs ammending to 1/DreamTime :)” And Geoff Brown concludes: Once there termites have been at a stick, the laws of Physics become socomplicated that I dont think any human has yet figured out how to predictthese things. I have seen shorter didjs that play lower than longer ones.Also the overtones that make a nice 10th on a plastic tube vary quite a lotwhen termites are involved. I would stick the the 1/Dreamtime formula, that’llwork well. Phil Scott has a paper: “(‘Acoustics of the Australian Didgeridoo’ by N.H.Fletcher, more info available to anyone interested), the taper of a typical termite didg certainly affects the fundamental frequency, as does the internal diameter. He gives the following equations:” Call the diameter of the narrow end d0, and of the wider end d1. The effective length, l, of the pipe is the actual length plus an open-end correction of 0.3*d1 – that could be the diame
