| 摘要 |
PROBLEM TO BE SOLVED: To prevent a listener from feeling gain fluctuation so much, to also deal with a signal of a quick level change and to provide a simple configuration where control is facilitated.SOLUTION: Levels of acoustic signals inputted from an input terminal IN are detected by a first level detection part 10 at a high followup speed and a second level detection part 11 at a low followup speed. A first level signal LV1 and a second level signal LV2 are supplied to a control part 12. In the case where a level ratio of the first level signal LV1 to the second level signal LV2 exceeds a predetermined level ratio equal to or greater than 1, the first level signal LV1 at a high followup speed is selected and in the case where the level ratio is equal to or smaller than the predetermined level ratio, the second level signal LV2 at a low followup speed is selected. On the basis of the selected level signal, a gain value GV is determined. In accordance with the gain value GV, an adjustment part 13 is adjusted and levels of acoustic signals are made uniform. |
