Cable television anti-interference isolator

Abstract

The invention discloses a cable television isolator which can effectively isolate low frequency interference on cable television cable to prevent that television image and sound quality is influenced, comprising a case which is formed by butt joint of upper and lower covers made by insulated material as well as a radio frequency plug and a radio frequency socket which are respectively blocked at the two ends of the case, wherein low frequency isolating capacitances are respectively arranged between the earth terminals and between the signal terminals of the radio frequency socket and the radio frequency plug. By adding the anti-interference isolator, the path on which the low frequency interference enters into a set top box from cable television cable is separated, and influence of low frequency interference on television image and sound is avoided, thus ensuring the quality of television image and sound.

Description

technical field [0001] The invention relates to an anti-jamming isolator, in particular to a cable TV anti-jamming isolator. Background technique [0002] As we all know, in the digitalization process of the cable TV network, it is necessary to install a cable TV receiver (set-top box) at the receiving end of the cable TV. The installation process is very simple. The connection structure of the TV after the set-top box is installed is as follows: figure 1 As shown, the audio and video input end of the TV set 1 is connected to the audio and video output end of the set-top box 3 through the video line 7 and the audio line 8 respectively, and the set-top box 3 is connected with the cable TV socket, that is, the radio frequency socket 4, through the cable TV connection line 9, and the TV The power cord 6 (three cores) of machine 1 is inserted in the power socket 2 of three pins. In the process of installing a cable TV receiver, it was found that after installing a set-top box ...

AI Technical Summary

Problems solved by technology

The above-mentioned low-frequency interference enters the set-top box 3 by the radio frequency socket 4 through the cable TV connection line 9, then enters the TV set 1 through the video line 7 and the audio line 8, and finally feeds back to the ground wire of the power socket 2 of the TV set, thereby There is a voltage difference between the video line 7 and the audio line 8, forming interference, and the audio and video signal level is low, the video is usually 1Vp-p, and the amplitude of the audio that can be clearly heard is usually below 100mVp-p. Therefore, Small low-frequency interference will interfere with audio and video signals, affecting the quality of TV images and sounds

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