Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1992-04-06
1993-05-11
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381199, 381201, G10K 1116, H04R 2500
Patent
active
052108058
ABSTRACT:
A transducer for use in an active noise cancellation system is particularly adapted for use as a motor vehicle exhaust muffler by physically designing the transducer to optimize magnetic flux with increases in temperature through the operating temperature range of the motor vehicle. The magnet material used to form the transducer is selected, and the load line which provides increased flux with increases in temperature is then equated to the ratio of the area of the gap to the length of the gap between the magnetic poles divided by the ratio of the area of the magnet to the length of the magnet; by equating the area of the gap to the length of the gap ratios at maximum B/H and the selected load range, the desired length of the magnet is derived since the area of the magnet is determined according to conventional criteria.
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AES Bandpass Loudspeaker Enclosures Publication Nov., 1986.
Ford Motor Company
Isen Forester W.
May Roger L.
Mollon Mark L.
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