| 摘要 |
PURPOSE:To increase and decrease a sound signal to the accompanying signal and to change the ratio by providing a balance adjusting means between a detecting means and a mixing means. CONSTITUTION:While a variable resistor 131 is set so that a balance adjusting means 13 may generate the output of a mixing means 12 to an output terminal 14, a variable resistor 403 is adjusted so that the sound signal component may come to be the minimum condition. Since the balance adjusting means 13 receives the signal even from the mixing means 12 and the variable resistor 131 is adjusted so that the output of the mixing means 12 may be executed to the terminal 14, a user adjusts the variable resistor 403 while the user is listening to the sound, and can make the sound signal component into the most attenuated condition. In such a condition, when the variable resistor 131 is adjusted, the ratio of the sound signal level and the accompanying signal level can be optionally changed. |
