System for reducing noise level in vehicular cabin

Details System for reducing noise level in vehicular cabin System for reducing noise level in vehicular cabin

1990-07-24

1992-05-05

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

051115077

ABSTRACT:
A system for lowering noise level in a vehicular cabin produces an acoustic vibration canceling noise creative vibration induced in synchronism with an engine revolution. The system generates a rectangular wave signal having 50% duty cycle. The system includes means for producing a periodic signal having an interval half of a period of the noise created by vibration. The signal level of the rectangular signal is switched between HIGH and LOW levels alternatively at the time of occurrence of the periodic signal.

REFERENCES:
patent: 4506380 (1985-03-01), Matsui
patent: 4689821 (1987-08-01), Salikuddin et al.

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