Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-10-29
1995-11-28
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
181224, G10K 1116
Patent
active
054715377
ABSTRACT:
A kitchen ventilator includes a housing (10) having a motor powered fan (20), an inlet (11), an inlet passage (25) between the inlet and the fan, an outlet (17), and an outlet passage (23) between the fan and the outlet, the passages are separated by a generally vertical partition wall (22). The inlet passage is partially formed by a baffle wall (26) provided between the inlet and the fan, and a removable front wall (16) provided with a sound absorbing material, and the outlet passage (23) has a narrowing portion (33) which is provided on both sides with sound absorbing material (18, 19).
For reducing the noise level, the ventilator is provided with an acoustic sensor (28) for sensing the noise of the fan, a loudspeaker (30) for emitting a sound silencing the fan noise in reverse phase therewith, and an electronic control unit (29) connected to the sensor and the loudspeaker and adapted to control the loudspeaker in response to information received from said sensor.
REFERENCES:
patent: 4044203 (1977-08-01), Swinbanks
patent: 4118226 (1978-10-01), Bourassa
patent: 4279325 (1981-07-01), Challis
patent: 4432434 (1984-02-01), Dean, Jr.
patent: 4733750 (1988-03-01), Poirier et al.
patent: 4965832 (1990-10-01), Edwards et al.
patent: 5299634 (1994-04-01), Toyoda et al.
Aktiebolaget Electrolux
Isen Forester W.
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