| 摘要 |
<p>PURPOSE:To improve response characteristics for gain stabilization by providing the receiving equipment with a test signal sending means for creating a test signal of a fixed level and a variable attenuator for controlling a level at a fixed value based upon a prescribed voltage/attenuation characteristic. CONSTITUTION:During the sending of a test signal, an I video signal and a Q video signal are outputted. The data of an initial value obtained immediately before inputting the test signal are preset on D/A converters 114, 116, 118. These receiving signal processing systems A to C are driven by time division. In this case, the control voltage/attenuation characteristics f(Zn-1) of the variable attenuators 58a, 58b, 58c are formed approximately to the measuring data of the receiving signal processing systems A to C, so that the response characteristics for gain stabilization can be accelerated.</p> |
