| 摘要 |
<p>PURPOSE:To simplify the circuit constitution, to reduce cost and to miniaturize a circuit by A/D-converting sequentially plural analog signals separated from a video signal in the prescribed order, and transmitting serially the digital output signals to a video bus. CONSTITUTION:A synchronizing signal, clock signal SYNC, color signals R, G and B and a luminance signal Y are separated from a color composite video signal 7 inputted to a synchronization/color separation circuit 1. The synchronizing and clock signals are inputted to a control circuit 5, and used for timing the switching signal of a picture. Besides, they are transmitted to a video bus 6 through a transmitting circuit 3. On the other hand, one of the color and luminance signals is selected in a selecting circuit 4 through the specification from the circuit 5, transmitting to an A/D converter 2, converted into a digital signal and transmitted to the bus 6 through the circuit 3. When the color and luminance signals are digitally converted one by one with use of one converter 2 in such a way, the number of A/D converters and that of video buses can be reduced.</p> |
