| 摘要 |
<p>PURPOSE:To cancel only distorted component without changing the frequency characteristics of a speaker, by simulating the distortion of non-linearity at an electric circuit and feeding it back, through the provision of an amplitude limit circuit with the feedback circuit of an amplifier. CONSTITUTION:When the displacement of a cone produced with a voltage at an output terminal 21 fed to a speaker is simulated with active low pass filters 4-8, the output voltage of an operational amplifier 8 constituting the filters 4-8 becomes a signal corresponding to the displacement of the cone. When this signal is simulated with amplitude limit circuits 9-12, the voltage at the voltage dividing point of resistors 9, 10 constituting the circuits 9-12 is the signal corresponding to the displacement of the cone actually simulating the frequency and non-linear characteristics of the cone. This signal passes through frequency correcting circuits 13-19 having complementary characteristics to the active low pass filters 4-8 and is returned to the state of original signal at the output terminal 21, and is fed back to an operational amplifier 3 connected to the output terminal 21.</p> |
