| 摘要 |
THE VELOCITY OF THE INTEGRAL SPEAKER COIL AND CONE OF THE CANCELING LOUDSPEAKER (10) OF AN ANC SYSTEM CORRESPONDS TO THE SOUND BEING PRODUCED BY THE CANCELING LOUDSPEAKER (10). BY SENSING THE VELOCITY OF THE SPEAKER COIL/CONE AND COMPARING THE SENSED VELOCITY TO THE DRIVING SIGNAL FROM THE CONTROLLER, THE RESPONSE TIME AND DISTANCE CAN BE SHORTENED.
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