Acoustics – Sound-modifying means – Housing or enclosure
Patent
1994-02-08
1997-05-13
Dang, Khanh
Acoustics
Sound-modifying means
Housing or enclosure
181207, 181208, A47B 8106, F16F 1500
Patent
active
056295030
ABSTRACT:
A vibration attenuating device for loudspeaker enclosures and other mechanical vibrating bodies includes one or more damping plates of viscoelastic material positioned to receive vibration energy transferred from the vibrating body. The vibration energy is transferred away from the speaker enclosure or other body and is dissipated as heat due to the internal molecular structure of the viscoelastic material, suppressing noise normally produced by the vibrating body. In various different embodiments, the vibration damping device includes damping plates shaped or mounted in such a way as to provide for attenuation of a wide band of frequencies of vibration. The damping plates themselves may each have a configuration providing for continuously varying frequency response along the length or circumference of the plate, and there may be included a plurality of different-sized plates, each responding essentially to a different frequency band. Instead of applying forces or structural restraints in an attempt to restrain a speaker enclosure from vibration in response to a speaker driver, the device of the invention provides a path for transfer of these vibrations to plates where they can be dissipated primarily internally, greatly suppressing sound produced by the speaker enclosure panels. Provision is made for response by the damping device to a wide range of frequencies of vibration.
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Dang Khanh
Freiburger Thomas M.
Tekna Sonic, Inc.
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