Vibration/noise reduction device for electrical apparatus

Details Vibration/noise reduction device for electrical apparatus Vibration/noise reduction device for electrical apparatus

1981-07-02

1984-03-06

Chin, Gary

Boots, shoes, and leggings

364576, 375 58, H04B 1500

Patent

active

044357516

ABSTRACT:
A vibration
oise reducing device for applying contrary vibrations/sound waves whose phases are substantially opposite to vibrations
oises generated from an electrical apparatus is disclosed, in which the vibrations
oises from the electrical apparatus are sensed by a sensor, the sensed analog time-domain signal is A/D converted, the resulting digital time-domain signal is then Fourier-transformed, the resulting Fourier-transformed digital frequency-domain signal is modified in its amplitude/phase to produce a second digital frequency-domain signal for generating a vibration
oise reducing control signal, the second digital-frequency-domain signal is inverse-Fourier-transformed, the resulting inverse-Fourier transformed second digital time-domain signal is D/A converted, and the resulting analog time-domain signal is used as the control signal to generate the contrary vibration/sound waves to be applied to the vibrations
oises.

REFERENCES:
patent: 3710082 (1973-01-01), Sloane et al.
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4067060 (1978-01-01), Poussart et al.
patent: 4194183 (1980-03-01), Neuner et al.

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