Modular active silencer with port dish

Details Modular active silencer with port dish Modular active silencer with port dish

1998-02-27

2000-06-06

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

381 713, 181206, 181224, 181228, 248 73, 248 743, 248505, H03B 2900, A61F 1106, F01N 708

Patent

active

060728809

ABSTRACT:
A modular Active Noise Control exhaust silencing system is provided including a housing defining an acoustic enclosure having an acoustic outlet port. A speaker is disposed within the acoustic enclosure and an amplifier is disposed within the housing and connected to the speaker. A microphone is associated with the housing for detecting the exhaust noise. A control unit is disposed within the housing in communication with the microphone for receiving signals therefrom. The control unit determines an anti-noise signal for the amplifier for creating an anti-noise responsive to a detected noise source. A port dish is disposed adjacent to the acoustic outlet port which serves as a noise cancellation aid.

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