| 摘要 |
PURPOSE: To obtain the stable head end device without dispersion in the characteristic by avoiding an experimental method and skill required for the adjustment. CONSTITUTION: Signals of 1, 3, 4, 6, 8, 10, 12 channels of broadcast signals received from an input terminal V such as FM broadcast signals or TV broadcast signals are given to a branching filter 11 comprising band pass filters S1-S8, which extract only a desired channel signal. The signal extracted by each of the band pass filters S1-S8 of the branching filter 11 is amplified by channel amplifiers A1-A8 and synthesized by a synthesizer 12 comprising band pass filters M1-M8 and the result is sent to a trunk line 13 of a common viewing device. The band pass filters S1-S8 of the branching filter 11 and the band pass filters M1-M8 of the synthesizer 12 are formed by using SAW filters exclusive for the channels. |
