Invention Grant
- Patent Title: Active acoustic transmission loss box
- Patent Title (中): 主动声传输损失箱
-
Application No.: US411779Application Date: 1995-07-07
-
Publication No.: US5692053APublication Date: 1997-11-25
- Inventor: Christopher R. Fuller , Michael P. McLoughlin , Stephen Hildebrand
- Applicant: Christopher R. Fuller , Michael P. McLoughlin , Stephen Hildebrand
- Applicant Address: MD Linthicum
- Assignee: Noise Cancellation Technologies, Inc.
- Current Assignee: Noise Cancellation Technologies, Inc.
- Current Assignee Address: MD Linthicum
- Main IPC: G10K11/178
- IPC: G10K11/178 ; G10K11/16
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.
Public/Granted literature
Information query