| 摘要 |
A back-end analog video signal and direct-current power processing circuit, a front-end analog video signal and direct-current power processing circuit, and an analog video signal coaxial power supply circuit. Each of the back-end processing circuit and the front-end processing circuit comprises an analog video signal passing circuit that is used for isolating a direct-current power and that allows an analog video signal to pass through, and comprises a direct-current power passing circuit that is used for isolating an analog video signal and that allows a direct-current power to pass through, so that the analog video signal and the direct-current power can be isolated; the analog video signal can be overlapped to the direct-current power without mutual interference, and the analog video signal and the direct-current power can run in parallel without interference; therefore, the function of overlapping the direct-current power on an analog high-definition video line can be achieved. Accordingly, the back-end processing circuit and the front-end processing circuit are respectively electrically connected to two coaxial ends, and the coaxial line can synchronously transmit the direct-current power and the analog video signal, the costs are saved, and the construction time is reduced. |
