Room mode bass absorption through combined diaphragmatic and...

Details Room mode bass absorption through combined diaphragmatic and... Room mode bass absorption through combined diaphragmatic and...

2004-01-16

2008-10-21

Ni, Suhan (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

C381S345000, C381S346000

Reexamination Certificate

active

07440580

ABSTRACT:
An acoustical bass absorber which reduces peak and dip frequency response errors caused by interference from naturally occurring axial standing waves in rectangular rooms. The apparatus uses two forms of simple harmonic resonance: pistonic diaphragm resonance and Helmholtz cavity resonance. The pistonic diaphragm resonance is achieved by attaching a rigid planar membrane to metal springs. The Helmholtz cavity resonance is achieved by constructing an enclosed chamber attached to an open cylindrical tube. Coupling these two dissipation devices leads to several-fold improvement in absorption and total room mode attenuation.

REFERENCES:
patent: 6778673 (2004-08-01), Hobelsberger
patent: 7206425 (2007-04-01), Vaudrey et al.
patent: 7212641 (2007-05-01), Sheplak et al.
patent: 7261182 (2007-08-01), Zainea

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