| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic gain control device that converges a level of an output signal to a narrow range of a target level when a level of an input signal fluctuates.SOLUTION: An automatic gain control section for detecting output levels of variable gain adjustment sections 21, 31 fed with frequency signals in level detection sections 22, 32, and outputting gain command values to the variable gain adjustment sections 21, 31 on the basis of results of comparison of level detection values with level target values to perform gain control is provided in a first automatic gain control section 2 and a second automatic gain control section 3 on a front stage and a rear stage, respectively. When the output level converges within an allowable range in the front stage side (first) automatic gain control section 2, the gain control of the first automatic gain control section 2 is stopped, and the gain control is performed in the second automatic gain control section 3.</p> |
