Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1992-04-14
1994-06-21
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 89, 381199, G10K 1116
Patent
active
053234669
ABSTRACT:
An active muffler for use in motor vehicles comprises a sensor, an electronic control responsive to the signal generated by the sensor for producing a drive signal delivered to a transducer which emits cancellation pulses phased 180.degree. from the sound pressure pulses passing through a conduit, where both front and rear sides of the transducer are acoustically coupled to the conduit to improve the efficiency of the transducer operation. Preferably, the acoustic coupling comprises an enclosed chamber including a port for communicating with the conduit which can be tuned to resonate at predetermined frequencies. When both sides of the transducer are so coupled to the conduit, the transducer has increased efficiency over a broad band of frequencies, and the frequency band can be broadened at the low end as required to accommodate the frequencies generated by a source of noise. A tandem transducer mounting arrangement according to the present invention reduces vibration of the housing while minimizing the mass and size of the transducers by juxtaposing or consolidating the magnet structure for a pair of transducer diaphragms. The system is particularly suitable for use in adapting noise cancellation techniques to replace or be combined with passive mufflers on motor vehicles.
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Ford Motor Company
Isen Forester W.
May Roger L.
Mollon Mark L.
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