DISTURBING RADIO WAVE ELIMINATING DEVICE

PURPOSE:To eliminate efficiently a disturbing wave by sweeping once a signal over the entire band width and eliminating disturbing waves in the order of its effectiveness among signal levels recognized as a spectrum. CONSTITUTION:An input signal from an antenna 1 is amplified by an amplifier 6 through plural variable frequency notch filters 2-5 and only a special frequency in a prescribed band width is selected by a variable frequency tuning circuit 7, amplified by a logarithmic amplifier 8, converted into a DC voltage by a detection circuit 9 and then outputted. When one sweeping is finished, the input reading and comparison are applied in the entire band by a ROM 15 and a CPU 13 as to the data stored in the RAM 14, a disturbing wave with maximum effectiveness is decided and the frequency of the 1st variable frequency notch filter 2 is set by the CPU 13. Similarly, the level disturbing wave of the 1st order at each measuring cycle is eliminated.