Silencer

Details Silencer Silencer

1990-02-27

1991-09-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

050520415

ABSTRACT:
A silencer for refrigerators includes a microphone for detecting noise produced by a compressor disposed in a machine compartment and converting the noise to an electrical signal, a signal converter converting the electrical signal generated by the microphone to a corresponding sound wave signal suitable for deadening the noise from the compressor by the effect of the sound wave interference, a speaker driven in response to the sound wave signal generated by the signal converter such that the sound is directed to the interior of the machine compartment of the refrigerator, a storage for previously storing data of noise patterns of the compressor in the abnormal condition of an evaporator as reference patterns, and a control comparing the electrical signal generated by the microphone with the data of the reference noise patterns stored in the storage, thereby determining as to whether or not the evaporator is abnormal.

REFERENCES:
patent: 4559828 (1985-12-01), Liszka
Bleazey, J. C., Electronic Sound Absorber, JAES, Apr., 1962, vol. 10, No. 2, pp. 135-139.

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