| 摘要 |
<p>PURPOSE:To reduce distortion due to non-linearity of a speaker remardably, by transmitting a distorted signal of the speaker ro an output terminal of the speaker on another route from an original signal to make distortion correction of the speaker. CONSTITUTION:An original signal from an input terminal 1 is amplified with an amplifier 3A and applied to a speaker 4A. A voltage proportional to the acceleration of an oiscllation system of the speaker 4A is detected at an acceleration detector 5A, the detection signal is given to an equalizer 7A, where the level and phase of the detection signal are matched to those of the original signal respectively and outputted to a subtractor 2. The subtractor 2 subtracts the output of the equalizer 7A from the original signal to obtain a distortion signal, and this distortion signal is amplified with an amplifier 3B and applied to an equalizer 7B. The equalizer 7B adjusts the signal level and phase so that the distortion based on the non- linearity of the speaker 4A can be minimized and the signal is applied to a correction device 15 provided with the speaker 4A. Thus, an output sound pressure waveform without distortion and having the same waveform as the original signal can be obtained.</p> |
