Patent ID: 6550063
Filing Date: 2003-04-15
Classification: H04N

Abstract:
A network interface module for receiving cable television broadcasting, comprising:a low-pass filter for transmitting an upstream signal to a cable television station; a high-pass filter for blocking the upstream signal and receiving a downstream signal from the cable television station; and a directional coupler for supplying the downstream signal to a visual and audio signal receiver circuit and a control signal receiver circuit, wherein said low pass filter, said high pass filter, and said directional coupler form a high frequency circuit built in a shielded package integrally as a module, wherein said high frequency circuit further includes a high frequency relay for a through output lead-out, said high frequency relay being provided to a stage prior to said visual and audio signal receiver circuit, wherein said high frequency relay includes: a first switch for connecting said directional coupler to said visual and audio signal receiver circuit while said network interface module is in operation; and a second switch for coupling a visual and audio output of said network interface module to an output terminal while said network interface module is in operation, and for connecting said directional coupler to the output terminal via the first switch while said network interface module is in standby.