| 摘要 |
PURPOSE:To prevent the sudden generation of a roar deafening sound from a speaker by comparing a sound volume level with a set level and controlling the volume level so as not to exceed the set level prior to the output of sound from the speaker. CONSTITUTION:After checking that a sound volume level is less than the previously set value of a sound volume setter 5 by a comprator 4, a sound signal 1 is outputted. When the level exceeds the set value of the setter 5, the volume is reduced up to the set point and then the signal 1 is outputted. |
