| 摘要 |
PURPOSE:To efficiently pick up a desired signal component, by providing a main filter obtaining an output of load sum of sample signals, an auxiliary filter which obtains a loaded sample signal applied variable load to the sample signals, and a subtractor which obtains the difference between the output of both. CONSTITUTION:Time serial sample signals XK(K=0,1-N-1) of received input signals and a load sum output of P sets of loaded sample signals XMO-XM(P-1) applied a specified load to the sample signals are obtained at a main filter A, and Q sets of loaded sample signals XAO-XA(Q-1) or their loaded sum applied variable load to the said sample signals are obtained at an auxiliary filter B, the output of the filter B is subtracted from the load sum output of the filter A at a subtractor 8 and the difference signal is obtained as a filter output. Further, the weighted value of the filter B is variably controlled based on the filter output and the input to the filter B. Thus, an unnecessary signal component can efficiently be suppressed and a desired signal can be picked up with low loss. |
