Patent ID: 9553554
Date: 2017-01-24
CPC Classifications: H03G,H04R

Claim:
1. A signal processing device comprising: an excessive input estimator that estimates excessive input of a target signal based on an estimated displacement of vibrations of a diaphragm of a speaker to which the target signal is to be provided; a controller that calculates frequency characteristics that will lessen the excessive input of the target signal in accordance with excessive input information estimated by the excessive input estimating unit; and a frequency characteristic modifier that modifies frequency characteristics of the target signal in accordance with the frequency characteristics the controller calculates, wherein the excessive input estimator, when estimating the displacement of vibrations of the diaphragm constituting the speaker, configures a filter that simulates the displacement by using at least one of the volume of the speaker, minimum resonant frequency information about the speaker and a Q-value of the speaker, and outputs a resultant signal obtained by supplying the target signal to the filter, and the filter that simulates the displacement is an infinite impulse response (IIR) filter of second order.