Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1994-05-19
1996-03-19
Gerrity, Stephen F.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15326, 381 71, A47L 928, G01H 300, G10K 1116
Patent
active
054994233
ABSTRACT:
A noise control apparatus for a vacuum cleaner, having a simple construction and capable of easy installation in the vacuum cleaner which effectively attenuates noise in a wide frequency band. The noise control apparatus includes a control unit, a noise detecting unit for detecting a noise generated from a noise source, generating a noise level signal on the basis of the noise detection, and sending the noise level signal to the control unit, a control sound generating unit for generating a control sound adapted to attenuate the noise from the noise source under a control of the control unit, and an error sound detecting unit for detecting an error sound resulting from the noise attenuation by the control sound from the control sound generating unit, generating an error sound signal on the basis of the error sound detection, and sending the error sound signal to the control unit. A low pass filter is coupled to each of the noise detecting units, the error sound detecting unit and the control sound generating unit. By the provision of such a low pass filter, it is possible to greatly attenuate noise having a frequency of 500 Hz or below.
REFERENCES:
patent: 2929462 (1960-03-01), Nowak
patent: 5047736 (1991-09-01), Ghose
patent: 5126681 (1992-06-01), Ziegler, Jr. et al.
patent: 5295192 (1994-03-01), Hamada et al.
patent: 5359662 (1994-10-01), Yuan et al.
Joo Jae-Man
Kim Yong-Woo
Alexander Reginald L.
Gerrity Stephen F.
Samsung Electronics Co,. Ltd.
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