Active low frequency acoustic resonance suppressor

Details Active low frequency acoustic resonance suppressor Active low frequency acoustic resonance suppressor

1988-12-02

1990-02-06

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 96, G10K 1116

Patent

active

048993875

ABSTRACT:
An electrically active sound wave attenuation apparatus mounted in an upright, free-standing housing for eliminating unwanted reflected waves in a room. The housing is intended to be placed in a location where undesired wave patterns, such as standing waves, are formed in order to offset or cancel such conditions. These conditions are offset by generating an acoustic signal which is the inverse of pressure waves at a particular location. The pressure waves are sensed by a module, including a microphone which generates a corresponding electrical signal. This signal is sent to an electrical circuit where an inverse signal is created which is then transmitted to a loudspeaker. The loudspeaker output is directed toward the location where the standing waves would be formed. The loudspeaker output nulls local acoustic waves so that no standing waves are formed. The housing may incorporate two acoustically isolated modules with resonance attenuating qualities, one at each end of the structure.

REFERENCES:
patent: 2160638 (1939-05-01), Bedell et al.
patent: 2502020 (1950-03-01), Olson
patent: 4455675 (1984-06-01), Bose et al.
patent: 4473906 (1984-09-01), Warnaka et al.
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Harry F. Olson, Acoustical Engineering, pp. 415-416, 511.
Vern O. Knudsen, Journal of the Acoustical Society, Jul. 1932, pp. 20-37, entitled: "Resonance in Small Rooms".

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