Silencer

Details Silencer Silencer

1989-09-28

1991-01-29

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

H03B 2900

Patent

active

049892525

ABSTRACT:
A silencer for refrigerators includes a microphone receiving sound from a motor-compressor mounted in a machine compartment to thereby generate an electrical signal in accordance with the received sound, a signal converter converting the electrical signal generated by the noise receiver to an electrical signal for producing sound deadening the sound from the motor-compressor by the effect of sound wave interference, and a speaker for producing the sound based on the signal converted by the signal converter so that the sound interferes with the sound from the motor-compressor. The machine compartment is closed with a ventilating opening left opened. One of dimensions of the machine compartment in the three-dimensional directions is set at a value larger than those of the others so that a standing wave of the sound from the motor-compressor in the machine compartment is composed only in a primary mode in a low frequency range below 700 Hz. The ventilating opening is formed into a generally rectangular shape extending in the direction perpendicular to the direction that the standing wave travels.

REFERENCES:
patent: 2043416 (1936-06-01), Lueg
patent: 4506380 (1985-03-01), Matsai
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4805733 (1989-02-01), Kato et al.

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