Processes and devices for protecting a given volume, preferably

Details Processes and devices for protecting a given volume, preferably Processes and devices for protecting a given volume, preferably

1993-12-09

1995-08-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

054386241

ABSTRACT:
To protect a volume (2) arranged inside a room (3) in regard to outside noises E, use is made of an array of acoustic sensors (11.sub.j) receiving the noise E and arranged a distance A from the volume and of an array of acoustic sources (15.sub.k) arranged a distance B less than A from the volume and signals S are applied to these sources, these signals being summations of the double convolution products of the function E.sub.j (t) with two functions f.sub.ij (t) and g.sub.ik (-t) which are directly deducible from the impulse responses gathered, on the one hand, at the sensors (11.sub.j) from pulses emitted by the sources (10.sub.i) carried by a fictitious barrier (6) delimiting the volume and, on the other hand, at sensors (12.sub.i) stationed at the same places as these latter sources (10.sub.i), from pulses emitted by the above sources (15.sub.k).

REFERENCES:
patent: 4683590 (1987-07-01), Miyoshi et al.
patent: 5216721 (1993-06-01), Melton
patent: 5216722 (1993-06-01), Popovich
patent: 5233540 (1993-08-01), Andersson et al.
Journal of the Acoustical Society of America, vol. 90, No. 2, Aug. 1991, "Iterative Time Reversal Mirror: A Solution to Self-Focusing in the Pulse Echo Node", C. Prada et al.

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