| 摘要 |
PROBLEM TO BE SOLVED: To prevent frequent occurrence of on/off switching of a pad even when a user carries out fine manipulation while enabling automatic on/off switching of the pad.SOLUTION: A level adjustment device includes a pad which attenuates a signal by a certain level, an amplifier which is provided at the back stage of the pad to adjust the level of the signal with a variable amplification rate or an attenuation rate, and a level adjustment means is provided which, when the pad is off, uses only the amplifier and, when the pad is on, uses the amplifier and the pad to adjust the level of the acoustic signal. The setting of a level adjustment value by the level adjustment means is received, and when the pad is on and the level adjustment value reaches a first threshold Ton, the pad is switched on, and when the pad is off and the level adjustment value reaches a second threshold Toff smaller than the first threshold Ton, the pad is switched on. |
