| 摘要 |
PURPOSE:To reduce the circuit scale and to decrease the cost by applying time series multiplex to plural color difference signals such as R-Y and B-Y into a signal path by means of a switch circuit so as to use in common an AD converted provided in one signal path. CONSTITUTION:A Y signal (video signal) system 9 is provided with the AD converter 10, a Y signal processing circuit 11 and a DA converter 12, and a chrominance signal system 13 is constituted with the 1st switch circuit 17 which switches alternately the R-Y signal of an R-Y signal path 14 and a B-Y signal of a B- Y signal path 15 and applies time series multiplex to the signals to one signal path 16, an AD converter 18, a color difference signal processing circuit 19, a DA converter 20 and the 2nd switch circuit 21 which shares the color difference signals in time series multiplex to an R-Y output line 22 and a B-Y output line 23. After these color difference signals are processed by a color signal processing circuit, the signals are converted into analog signals by the DA converter 20 and separated by the 2nd switch circuit 21. The changeover timing of the 2nd switch circuit 21 is formed as a timing so as to share the R-Y signal to the R-Y output line 22 and the B-Y signal to the B-Y signal line 23. |
