| 摘要 |
The invention relates to noise or sound control achieved by enclosing the noise source in an active enclosure (10). Arrays of vibration inputs such as shakers, piezoceramic, etc. (14, 15) are attached to th e walls of the active enclosure, or loudspeakers located inside the enclosure can be used to excite the sites of the enclosure. A n array of error microphones are located in the radiated acoustic field or PVDF strips (20, 21, 22) are positioned on the wall. A control ler (19) senses the levels of sound observed at the error microphones (16, 17, 18) or PVDF film (20, 21, 22) and adjusts the osc illating inputs (in terms of frequency, content, phase and magnitude) to the active vibration inputs in order to minimize the rad iated sound.
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