Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Active Noise Cancellation for Cleanrooms

IP.com Disclosure Number: IPCOM000016332D
Original Publication Date: 2002-Nov-17
Included in the Prior Art Database: 2003-Jun-21
Document File: 1 page(s) / 34K

Publishing Venue

IBM

Abstract

Disclosed is a method to reduce the noise level in places, caused by running fans, such as in the cleanrooms. Cleanrooms use very strong fans to produce large air flow to promote circulation. The turbulence generated causes very loud noise. The noise poses a potential health problem for workers inside the clean room and also induces fatigue and loss of concentration. The active noise cancellation technology provides areas with significantly reduced noise. The method is to use sound transducers (at stations where the noise needs to be reduced) to pickup the sound wave and feed it into loud speaker(s) facing the station. By adjusting the phase delay, a specific frequency range of the noise can be cancelled with destructive interference. 1

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Active Noise Cancellation for Cleanrooms

Disclosed is a method to reduce the noise level in places, caused by running fans, such as in the cleanrooms. Cleanrooms use very strong fans to produce large air flow to promote circulation. The turbulence generated causes very loud noise. The noise poses a potential health problem for workers inside the clean room and also induces fatigue and loss of concentration. The active noise cancellation technology provides areas with significantly reduced noise.

The method is to use sound transducers (at stations where the noise needs to be reduced) to pickup the sound wave and feed it into loud speaker(s) facing the station. By adjusting the phase delay, a specific frequency range of the noise can be cancelled with destructive interference.

1