| 摘要 |
It is possible to enable automatic on/off switching of a pad and to prevent frequent occurrence of on/off switching of a pad even when a user carries out fine manipulation. A level adjustment device includes a pad which attenuates a signal by a predetermined level, an amplifier which is provided at the back of the pad to adjust the level of the signal with a variable amplification rate or attenuation rate, and a level adjustment unit 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 unit is received, when the level adjustment value reaches a predetermined switching point Tsw, the on/off of the pad is switched, and when an instruction is issued to start a performance mode, the value of the switching point Tsw is changed so as to be away from the level adjustment value at the point of time of the instruction. |
| 主权项 |
1. A method for attenuating an audio signal comprising:
entering a first operation mode; determining that a first level adjustment value of a level adjustment parameter is within a range of a first switching point, the level adjustment parameter associated with a gain control controlling a gain level of the input channel for the audio signal, the input channel comprising a switchable attenuation pad and an amplifier; in response to said determining,
transitioning a state of the switchable attenuation pad anddetermining a second switching point, wherein the second switching point is based on the state of the switchable attenuation pad after said transitioning, wherein the state of the switchable attenuation pad transitions when the level adjustment parameter has a level adjustment value that reaches or crosses the second switching point, and wherein the separation between the first level adjustment value and the second switching point is greater than the separation between the first level adjustment value and the first switching point; applying a variable gain level to the amplifier based on the level adjustment parameter and the state of the switchable attenuation pad; and entering a second operation mode, wherein the state of the switchable attenuation pad transitions during the second operation mode when the level adjustment parameter has a level adjustment value that reaches or crosses a second operation mode switching point. |
