Cable television signal anti-interference device

An anti-interference device and cable TV technology, which is applied in the direction of TV, color TV, color TV parts, etc., can solve the problems of receiving signal image field out of sync, distortion, humming noise interference, etc., and achieve good test results

Inactive Publication Date: 2009-10-07
山东东升电子集团有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Hum noise interference has the characteristics that the low channel is more serious than the high channel, and the night is more serious than the day. When it is serious, it will also make the received signal image field asynchronous or locally distorted

Method used

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  • Cable television signal anti-interference device

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Embodiment Construction

[0013] As shown in the accompanying drawings, the CATV signal anti-interference device is used in a cable signal transmission circuit, including an interference signal isolation device connected in series to the signal transmission center wire line of the cable signal transmission circuit, and a cable connection device connected in series to the cable signal transmission circuit. The interference signal isolation device on the shielded line of the circuit, the interference signal isolation device is a filter capacitor 3 for isolating DC signals and low-frequency signals, and the filter capacitor 3 can filter the DC signals mixed in the cable TV video signal and affect the quality of the TV picture and low frequency signals.

[0014] The CATV signal anti-jamming device of this embodiment also includes a casing 1, the casing 1 can not only prevent the oxidation of the welding point, but also play the role of insulation, and the casing 1 is fixedly installed with an input signal c...

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Abstract

The invention discloses a cable television signal anti-interference device which is used for a cable signal transmission circuit and comprises an interference signal isolation device in serial connection with a signal transmission center conducting wire of the cable signal transmission circuit and an interference signal isolation device in serial connection with a shielding circuit of the cable signal transmission circuit; the cable television signal anti-interference device utilizes the interference signal isolation devices on the signal transmission center conducting wire and the shielding circuit of the cable signal transmission circuit to obstruct low-frequency signals and direct current signals, which isolates the low-frequency signals and the direct current signals interfering a TV in radio-frequency signals before the radio-frequency signals enter the TV, thereby effectively eliminating the influence of earth loop interference and hum interference on video signals, obtaining good testing result and customer satisfaction degree through laboratory experiments and tryout of customers and having very good market potential.

Description

technical field [0001] The invention relates to a signal anti-interference device used in cable TV. Background technique [0002] When TVs receive radio frequency signals, they are easily interfered by low-frequency signals, especially for LCD TVs and plasma TVs that are currently on the market. Although users have user terminals at home, the isolation effect is not very satisfactory. Among them, ground loop interference is a relatively common interference factor, and its internal cause is the ground potential difference between devices. The ground voltage causes a ground loop current, and due to the unbalanced nature of the circuit, the ground loop current causes a differential mode interference voltage that affects the circuit. Because the ground loop interference is caused by the ground loop current. [0003] Reason 1 for the formation of ground loop interference: The ground potentials of the two devices are different, forming a ground voltage. Driven by this voltage, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/10H04N5/00
Inventor 徐永波王富兵刘志鹏
Owner 山东东升电子集团有限公司
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