| 摘要 |
PURPOSE:To decrease a level difference in each seat by averaging by weight a transmission characteristic extending from a sound source to each listener and correcting an input signal to a loudspeaker by a correcting circuit such as a filter, having a frequency characteristic reverse to the transmission characteristic averaged by weight. CONSTITUTION:By averaging by weight a transmission characteristic Trd (fr) between a loudspeaker 4 and a front listener 2 and a transmission characteristic Trr (fr) between the loudspeaker 4 and a rear listener 3 an averaged transmission characteristic is obtained. In this state, a voice signal is inputted to the loudspeaker through a filter having a frequency characteristic reverse to said transmission characteristic, for instance, a graphic equalizer (25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 163Hz and 200Hz points). In such a way, the level to the listeners in each seat is averaged. |
