Dual bandpass secondary source

Details Dual bandpass secondary source Dual bandpass secondary source

1994-03-02

1995-07-11

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

181206, A61F 1106, H03B 2900

Patent

active

054328578

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. The system is particularly suitable for use in adapting noise cancellation techniques to replace passive mufflers on motor vehicles.

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AES, "Bandpass Loudspeaker Enclosures", Publication Nov., 1986, 2383, pp. 1-26, Figs. 1-24.

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