FILTER DEVICE, AMPLIFYING DEVICE AND TELEVISION RECEIVING SYSTEM

PROBLEM TO BE SOLVED: To solve the problem that not only an analog broadcasting wave signal but also such a signal whose electric field strength is large from the same direction as a terrestrial digital broadcasting signal is inputted to an amplifying device for television reception, thereby the input level of the amplifying device is increased, and any disturbance is generated on a reception screen. SOLUTION: This filter device is provided with a first transmission path for passing a specific signal and a second transmission path for passing a signal which does not pass through the transmission path and first and second branching means between an input terminal and an output terminal. The first transmission path is interposed between the output terminal of the first branching means and the input terminal of the second branching means, and the specific signal is made to pass from the input terminal to the output terminal. The second transmission path is interposed between the branch terminal of the first branching means and the branch terminal of the second branching means, and any signal other than the specific signal is made to pass from the input terminal to the output terminal. This amplifying device is provided with the filter device and this receiving system is provided with those devices. COPYRIGHT: (C)2006,JPO&NCIPI