Differential antenna and circuit control system of digital television

Abstract

The invention discloses a differential antenna and a circuit control system of a digital television. The circuit control system comprises a differential mode antenna, a control unit and a switch circuit, wherein the differential mode antenna receives a broadcasting signal, and generates a differential radio frequency signal; the differential radio frequency signal comprises a first / positive signal and a second / negative signal; the control unit generates a selection signal according to a watched channel; the switch circuit comprises a plurality of matching circuits and a switch control circuit; each matching circuit can optimize a part of digital television bands; the switch control circuit receives the selection signal to control the positive and negative signals to generate an optimized positive signal and an optimized negative signal after passing through a first matching circuit and a second matching circuit respectively, transmits the optimized positive and negative signals to the control unit, and the first and second matching circuits optimize the same band; therefore, the control unit can generate a watched channel signal according to the optimized positive and negative signals.

Description

Technical field [0001] The invention relates to an antenna and its circuit control system, in particular to a differential antenna and its circuit control system used in digital television. Background technique [0002] Please refer to Figure 1A , Which shows a digital TV receiving system known to be used in computer mainframes. Generally speaking, to use the host computer 100 to watch digital TV, it is necessary to use a digital TV receiver (Digital TV receiver) 120 to connect to a connection port (such as a USB port) of the host computer 100, and to install the digital TV in the host computer 100. application. Furthermore, the digital TV receiver 120 includes an antenna 125 and a control unit 128. The antenna 125 can be used to receive a broadcasting signal of the digital TV, and the control unit 128 can be further converted into a video channel signal. The video channel signal is The channel selected by the user is transmitted to the host computer 100. [0003] Please refer t...

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Problems solved by technology

[0006] Furthermore, since the length of the antenna is inversely proportional to the receiving frequency, the size of the antennas used in digital televisions on the market today is relatively large, and it is impossible to design the antenna in the host computer 100. If the size of the antenna is deliberately reduced If it is reduced, the receiving efficiency of the antenna will be greatly reduced

[0007] Furthermore, since the electromagnetic interference (Electro Magnetic Interference, EMI) inside the host computer 100 is very large, if the known digital TV antenna is placed inside the host computer 100, poor reception or Cannot watch digital TV

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