Wired signal access circuit of digital television receiving terminal

Abstract

The invention provides a wired signal access circuit of a digital television receiving terminal. A filtering unit is serially connected with a wired signal access unit which is externally connected with a wired network for transmitting signals in the wired network; when the wired signal access unit is externally connected with the wired network, the filtering unit isolates a wired network ground signal transmitted by the wired network access unit when the wired network ground signal is a low frequency signal, and transmits the wired signal transmitted by the wired signal access unit when the wired signal in the wired network is a high frequency signal so that the television does not access the wired network ground but accesses the commercial power supply ground so as to avoid alternating current (AC) sound. The playing effect of television output sound is guaranteed, and the safety coefficient of the television is also guaranteed.

Description

technical field [0001] The invention relates to the technical field of digital TV receiving terminal communication, in particular to a wired signal access circuit of a digital TV receiving terminal. Background technique [0002] In recent years, the country has gradually converted all analog TV users into digital TV users and promoted digitalization of cable TV. Cable TV digitalization is to transmit digital TV signals through the digital upgrading and reconstruction of cable TV network, and use digital TV receiving terminals to receive digital TV signals at the user end. After the overall conversion of cable TV to digital, the TV picture is clearer, the sound is more vivid, the channels are multiplied, information can be browsed and interactive TV can be activated. TV has truly become a home multimedia information terminal, and then an important symbol of national informatization, social informatization, and family informatization. [0003] With the digital transformation...

AI Technical Summary

Problems solved by technology

However, adopting this technical solution, the digital TV receiving terminal needs to be redesigned, and the currently used digital TV receiving terminal will be eliminated, resulting in waste; in addition, the digital TV receiving terminal designed as a three-core power cord will be cumbersome and difficult to disassemble. 1. It is inconvenient to move. The second prior art is to cut off the grounding wire in the three-core power cord of the TV: first, destroy the grounding metal body of the three-pin plug of the TV, so that it cannot be connected; second, connect it without a grounding wire The plug board, to cut off the grounding of the TV set

However, adopting this scheme will destroy the effective grounding of the TV, resulting in a reduction in the safety factor of the TV.

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