| 摘要 |
PURPOSE:To reduce the cost, by providing a circuit which switches TV and character broadcast signals, even if the output of a color demodulation circuit of a TV receiver is the three primary colors, or a color difference signal and a luminance signal. CONSTITUTION:The 1st signal input terminals 8,..., 11 of n-set (where; n is an integer, 2 or over), n-sets of the 2nd signal input terminals 8',..., 11', n-sets of switching circuits 12,..., 15, a discriminating circuit 16, a control circuit 17, and n-sets of output terminals 18,..., 21 are provided. The input terminal 11 of the discriminating circuit 16 is connected to either one signal input terminal out of n-sets of the 1st signal input terminals, the control circuit 17 is connected to the discriminating circuit 16, the output of the control circuit 17 is connected to the n-sets of switching circuits 12-15, n-sets of the 1st signal input terminals and n-sets of the 2nd signal input terminals are respectively connected with each other, and the output of the n-sets of switching circuits 12-15 are connected to the n-sets of output terminals. |
