| 摘要 |
<p>A sound reproducing system that automatically determines a control target value from a radiation sound and noise from a speaker unit, and naturally corrects a reproduced sound volume with respect to masking by noise at a listening point while following up the volume of noise. A first microphone is located around a speaker box, and a second microphone is located inside the speaker box. The amplification factor of a variable gain amplifier is changed so that the integration value of a signal obtained by filtering and adding up respective outputs and the integration value of a signal obtained by filtering an output from a variable gain amplifier are equal to each other.</p> |
