Electrical interference between each other to resolve the interference between the electrical conduction and radiation are , in the performance of a mesh on the image , a white or black dot . Radiated interference engineering in general rare, common in communication base near occasions. Can be partially solved by good electrical grounding . But through the power line conducted interference should not be resolved, bore the brunt of the signal source and the projector , respectively, to the signal source and the projector access a filter insertion loss is greater than 60dB , with good results .

 

Use the projector and karaoke machines

 

    Domestic projector function is relatively simple to use less , talk about here is mainly with the use of proper mating signal source .

 

    Currently VOD machine brands on the market are more or less the same technology used in architecture , hardware peripherals are greater differences in grade , especially video decoder card brand range , the output interface is generally the following categories :

 

    The first product interface is complete , the standard four-pin S-video, image output impedance RCA terminals are 75Ω, the output level measured was CVBS 1Vp-p, Yout 1Vp-p, Cout 0.27Vp-p, and the market almost corresponding interface projector and all other video terminal directly connected , can get a good image effect.

 

    The second class of products without images RCA output terminals , its decompression card has only one non-standard seven-pin S-Video , is a combination of type , both RCA output signal is also output S-Video signals. Therefore, S-Video signals can be directly inserted into the S-Video cable to connect this jack with projectors and other video terminals, can get a good image effect . If you are connected to the projector's image RCA terminals must use special adapters, general karaoke machines dealers can provide .

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