| 摘要 |
PURPOSE:To obtain a circuit making the level after equalization almost flat by setting a delay amount of a delay circuit in matching with the propagation delay time between a direct wave and an interruption wave. CONSTITUTION:A delay time tau of a delay circuit 52 is set optionally in matching with the delay time between the direct wave and interruption wave being a cause to fading. Furthermore, the delay time is decided almost definitely when a geographical shape between the transmission side and reception side is decided. In an axample of execution, plural delay circuits (tau1, tau2-taun) generating plural kinds of delay times are prepared in advance, and a suitable delay circuit is formed by using a selection switch 51 provided to the input stage and a selection switch 53 provided to its output stage. If a waveform of Curve B in Fig. appears, the delay circuit is selected to increase more the delay time tau and if a waveform of Curve C appears, the delay circuit decreasing the tau is selected. After the adjustment of the tau, if a waveform of curve A or D appears, the tau is kept unchanged, signals Sphi and SP to compensate the propagation distortion are changed and the waveform is made close to a falt waveform. |
