Air Columns And Toneholes- Principles For Wind Instrument Design _hot_ Page

Toneholes allow a player to change the effective length of the instrument by providing an "acoustic short circuit" to the outside air.

The vertical wall of the tonehole—the chimney—is a powerful acoustic tool. A tall chimney adds acoustic mass to the system, increasing the end correction and lowering the pitch of that note. A short chimney (a hole filed flush with the bore) has minimal effect but is harder to seal.

These offer high acoustic resistance. They darken the tone and lower the pitch, which is helpful for fine-tuning individual notes. Cutoff Frequency Toneholes allow a player to change the effective

) of the tube, which is slightly longer than the physical length due to "end effects"—air vibrating just beyond the pipe's exit. Bart Hopkin 2. Tonehole Physics

: Acts as a pipe open at both ends (flute) or closed at one end (clarinet). A short chimney (a hole filed flush with

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If designing an instrument were simple, a builder could calculate the wavelength of a target note, drill a hole at that exact measurement, and achieve perfect pitch. In practice, several physical variables distort this calculation. End Correction Cutoff Frequency ) of the tube, which is

An instrument plays most easily at frequencies where its acoustic impedance peaks. At these frequencies, minimal effort from the player yields maximum acoustic pressure inside the bore.

A series of open toneholes acts as a high-pass filter. Above a specific "cutoff frequency," sound waves "ignore" the holes and travel to the end of the instrument, affecting the instrument's brilliance and projection. Effective Height: