SIGNAL CORRECTING DEVICE, SIGNAL CORRECTING METHOD, AND COEFFICIENT ADJUSTING DEVICE AND COEFFICIENT ADJUSTING METHOD FOR SIGNAL CORRECTING DEVICE

摘要

A signal correcting device (12) which can easily, quickly, and surely correct the characteristics of a transmission system, such as the loudspeaker, etc., having nonlinearity. The signal correcting device (12) supplies input signals (u) to a transmission system (14) after correcting the signals (u) so that the characteristics of the system (10) can approach specified target characteristics. A displacement filter (16) predicts virtual displacement (x) based on the signals (u) by using a filter factor decided based on the target characteristics. A correction factor deciding section (18) decides part of the filter factor of a correction filter (22) based on the virtual displacement (x). The section (18) also decides the amplitude adjusting factor of an amplitude adjusting section (24) based on the displacement (x). The filter (22) is constituted of a second-order or higher digital filter having a feedback loop and corrects the input signals (u) by using the decided filter factor. The amplitude adjusting section (24) adjusts the amplitude adjusting factor. The filter (22) and the section (24) constitute a signal correcting means (20).