摘要 |
PURPOSE:To attain cost down by providing a control means outputting red, green and blue video signals to one signal line in time sharing method to simplify the interface between a CRT control section and a color hard copy. CONSTITUTION:A ternary counter 10 is operated in synchronizing with a vertical synchronizing signal and transmits a signal for sending repetitively the R, G, B at each frame to OR circuits 50, 51, 52 by using a decoder 20. A determined burst signal to the R, G, B video signals respectively is ORed by OR circuits 40, 41, 42. Moreover, an OR circuit 60 is an OR circuit for horizontal and vertical synchronism, an OR circuit 70 incorporates video signals including the R, G, B burst signals and driver circuits 80, 81 convert the signal into 1-2vpp signals. Thus, the R, G, B video signals are added to the burst signals and transmitted to a coaxial cable 90 in the time sharing method. |