A noise controller which noise-controls a movable point so that a noise generated from a noise source and transmitted to the movable point can be reduced. The noise controller filters the noise in accordance with a least mean square algorithm and generates an antinoise to be collided with the noise so...http://www.google.com.tw/patents/US5267320?utm_source=gb-gplus-share專利 US5267320 - Noise controller which noise-controls movable point
