| 摘要 |
PURPOSE:To improve operativity, by giving a control signal from an operation control part to a gain control device in accordance with the search result of disturbing waves to control the gain and by performing an indicated operation by a memory switch. CONSTITUTION:A memory switch 31 is provided on an operation keyboard 19 in the conventional device, and the existence of disturbing waves which disturb a desired frequency is searched by the memory switch 31, and the operation where a control signal is given from an operation control device 20 to a gain control device 18 in accordance with the search result to control the gain is performed by the memory switch 31 also. Thus, operativity is improved. |
