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Markus Schneider - FH-Regensburg
Acoustics of the Acoustics of the CajonCajon
ContentContent
HistoryHistory Acoustic System of the Cajon – Acoustic System of the Cajon –
OverviewOverview PlatePlate Helmholtz ResonatorHelmholtz Resonator Other ResonatorsOther Resonators EquipmentEquipment
HistoryHistory
Origin in PeruOrigin in Peru The first instruments were shipping The first instruments were shipping
boxesboxes ““Cajon” is the Spanish word for boxCajon” is the Spanish word for box Adopted by Cuban flamenco Adopted by Cuban flamenco
percussionistspercussionists
Acoustic System - Acoustic System - OverviewOverview
Coupled System
Helmholtz
Resonator
Plate with
clamped edges
Plates – Modes of Plates – Modes of vibration 1vibration 1
TheoryTheory SimulationSimulation Recorded Recorded VideoVideo
FundamentalMode
(0,1) Mode
Plates – Modes of Plates – Modes of vibration 2vibration 2
TheoryTheory SimulationSimulation Recorded Recorded VideoVideo
FundamentalMode
(1,0) Mode
Helmholtz-ResonatorHelmholtz-ResonatorCalculationCalculation FFTFFT
C: Speed of waves in airr: Radius of the holeV: Volume of the body
Dominant frequency : 160 Hz
Other Helmholtz Other Helmholtz ResonatorsResonators
Exhaust systemExhaust system LoudspeakerLoudspeaker Body of other Body of other
musical instrumentsmusical instruments
EquipmentEquipment
Acoustic Camera Acoustic Camera 33 microphones “make sound 33 microphones “make sound visible”visible”
Software Software NoiseImage NoiseImage
Equipment can be Equipment can be seen at FH-Regensburgseen at FH-Regensburg Mechanical Mechanical
EngineeringEngineering
Markus Schneider - Acoustics of the Cajon
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