Peter Hoekje's MUSICAL ACOUSTICS Page
This spreadsheet is intended to partially automate
design of tonehole layouts for woodwinds, by calculating the effective
corrections for bores with tone holes. As it is, it is set up for a
PVC flute that plays an F major scale, using 6 or 7 holes. Please note
I have left you a little work to do... the hole sizes given are too
and therefore the "local cutoff frequency" is too low, resulting
in a flat second register. As an assignment in our Acoustics course,
students have to fix this defect, while designing a tone hole layout that fits their own fingers. Given a scale of target frequencies and hole sizes, the spreadsheet calculates the best positions (if possible) for the holes in order to play in tune. The designer can change the hole sizes and see where the holes end up. It may also be adapted
other scales or other woodwinds, as you wish. If you have any problems with the file or questions about the acoustics, drop me a line at email@example.com.
At Baldwin Wallace University, students in PHY101 Acoustics have to design
and build their own flutes during two 2-hour lab periods. Here
are the instructions for these labs, in Adobe PDF format.
Air column resonance demonstrations,
handout to a paper given by U. Hansen and P. Hoekje at the 136th
of the Acoustical Society of America, Norfolk, VA, October 1998,
instructions for a simple impedance head that can be made from low cost
parts and used in conjunction with a computer sound card for
into the acoustics of tubes and wind instruments. I gave a slightly updated version of this
at Stanford/CCRMA in January 2006.
Sound files containing "chirps": flat
from 100 to 5000 Hz; and pre-compensated by -6dB/8va for use with
drivers, in the following frequency ranges: 100-3000Hz,
and a brief explanation.