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Helmholtz resonator

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Helmholtz resonator

Spherical vessel of metal or glass with an opening and an earpiece on opposite sides, from a harmonic series of 19 such vessels constructed for the German physicist Hermann Helmholtz (1821-1894) as an instrument of acoustic analysis. Placed in the ear, it acts as an acoustic filter, allowing only sounds of a particular pitch to be heard. Helmholtz also used resonators in series with tuning forks as sound sources in pioneering experiments in synthesizing instrumental timbres.

The ear canal acts in a similar way, enhancing frequencies in the range 1,000-4,000 Hz.
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At short test sites in Italy and the Netherlands noise-absorbing Helmholtz resonators are embedded in the concrete foundation, cutting several decibels more.
EU ramps up road improvements by Holzman, David C. / Environmental Health Perspectives
Helmholtz Resonator--The Helmholtz resonator (or cavity resonator), consists of a cavity that is connected to the noisy space through a short neck.
Controlling noise in foundries by Kluesener, Matthew F. / Modern Casting
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