| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a further silenced elevator device. <P>SOLUTION: A machine room-less elevator including a hoistway 1, a car 3 elevated in the hoistway, and a hoisting machine 5 installed in the hoistway, includes an active noise controller apparatus near the hoisting machine to reduce noise of the elevator. The active noise controller apparatus comprises a detecting microphone 11a provided adjoining the hoisting machine; a control loudspeaker 11b provided toward the hoisting machine; an evaluation microphone 11c provided adjoining a landing; and a controller 11d. Noise caused by the hoisting machine is received by the detecting microphone, and waveform of a reverse phase is transmitted to the hoisting machine from the control loudspeaker. The evaluation microphone receives overlapped sound and feeds it back to the controller to correct the dial tone of the control speaker. <P>COPYRIGHT: (C)2008,JPO&INPIT |
