| 摘要 |
<p>A method is disclosed in order to compensate for the non-linear transfer behaviour in a loudspeaker, comprising designing a model of the physical loudspeaker which is used in a non-linear estimator (12) (observer). The estimator receives the voltage across the moving coil of the loudspeaker and the current in the coil. These signal values are used for calculating an estimate which is fed to a differential unit having two inputs, the second one of which receives a desired signal. The difference between the two signals is fed to a controller (9) which then controls the current/voltage to the loudspeaker, optionally via an amplifier (10). The non-linear signal components of the loudspeaker may be limited hereby, which results in a significant reduction in the distortion in the loudspeaker. The estimator is designed such that it also allows for the dynamic variations which exist in the non-linear component parts of the loudspeaker, e.g. owing to changed temperature conditions.</p> |
