High resolution 3D radiation measurements on the bassoon

Timo Grothea and Malte Kobb

aHochschule für Musik Detmold
bDetmold University of Music

Saturday, September 14, 2019 from 14:00 to 14:01

in Summer Theater

Abstract :
Musical wind instruments with tone-holes have complex radiation patterns. Since openings act as sound sources, depending on their relative distance and phase soundwave superposition can lead to boosts or cancellations at different observation points. These phenomena are particularly prominent in the bassoon, as a multitude of differently sized tone-holes are distributed irregularly across a long, bent corpus. To extend our knowledge on pitch-related directivity patterns of such complex instruments the bassoon was chosen as a test case measurement object for a high resolution radiation measurement in 3D, using a repeatable, artificial excitation and a 2 axis turntable. We compare the radiation patterns of three different tonehole configurations, and discuss implications for simultaneous measurements with a microphone array.

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