Active acoustic transmission loss box
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United States of America Patent
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-
Nov 25, 1997
Grant Date -
N/A
app pub date -
Jul 7, 1995
filing date -
Oct 8, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to noise or sound control achieved by enclosing the noise source in an active enclosure. Arrays of vibration inputs (for example, shakers, piezoceramics, etc.) are attached to the walls of the active enclosure, or loudspeakers located inside the enclosure can be used to excite the sides of the enclosure. An array of error microphones are located in the radiated acoustic field or PVDF strips are positioned on the wall. A controller senses the levels of sound observed at the error microphones or PVDF film and adjusts the oscillating inputs (in terms of frequency content, phase and magnitude) to the active vibration inputs in order to minimize the radiated sound.
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