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Improving Loudspeaker Performance for Active Noise Control Applications
Actuator performance plays an important part in active noise and acoustic control. The loudspeakers that are normally used as actuators in many active noise and acoustic control applications add significantly to the dynamics of the control loop and can be detrimental to the controller's performance. By compensating a loudspeaker with a technique similar to motional feedback, the loudspeaker performance is enhanced for applications such as control of acoustic enclosures. A method to compensate a loudspeaker easily and reliably in order to approximate constant volume velocity behavior over the piston-mode frequency range is presented and demonstrated. This decouples the actuator from the system being controlled and reduces the impact of the loudspeaker's dynamics over the control bandwidth. Experimental results of the proposed method using a 5-in (127-mm) loudspeaker are included.
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