Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With time interval measuring means
Reexamination Certificate
2005-12-19
2008-11-18
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With time interval measuring means
C367S901000
Reexamination Certificate
active
07453771
ABSTRACT:
A noise control system is provided for controlling a noise level around a moveable target. The noise control system has a detecting system configured to detect a location and movement of the target, and a noise cancellation system. The noise cancellation system has a sensor for dynamically sensing noise at the location of the target. The noise cancellation system is configured to be responsive to detection of the location of the target by the detecting system and the sensed noise to provide a noise cancellation wave to a first space at and around the location of the target. The noise cancellation system is further configured to be responsive to detection of the movement of the target by the detecting system and the sensed noise, and to provide a noise cancellation wave to a second space to cover the moving target. The second space is larger than the first space.
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Caterpillar Inc.
Finnegan Henderson Farabow Garrett & Dunner
Pihulic Dan
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