The LED display has been generally used in a big commercial plaza, the location of the wide commercial centers and all kinds of traffic, like railroad station, metro, shopping centers and many more. Due to the different areas of the display effect its diversity and complexity, the audio and video signal transmission is stable, reliable, fluency is also put forward higher requirements.
Single play , or the LED presentation of system show and different events LED showcase sign utilizing the transmission method for diversification. Common LED presentation signal into the wired sign transmission link , GPRS, 3G and 4G remote approach to pass on the remote signal. How much do you realize that about the LED showcase signal transmission?
First, the classification of LED large screen signal transmission:
1. Wireless transmission - Using wireless signals to the frequency of different categories, such as long wave, medium wave, short wave, microwave, etc.Cell phone signal is a kind of wireless access method, a lot of use of mobile phones in 900 MHZ GSM operation frequency.Television signals varieties more, such as cable television: general transmission of analog signals, digital television is the transmission of digital signal;Satellite TV signals are digital LED display signal.
2. Cable transmission - this can be divided into analog signals, digital signals transmission, digital optical signal transmission.
The second is: LED electronic display screen signal transmission project:
Notwithstanding the sign weakening, influence another component of the sign transmission is that the sign reflection. Impedance jumbles and the impedance don't need to be the RS - 485 transport signal impression of the two essential reasons. Impedance confound, impedance don't coordinate first stallion is 485 chip and the impedance bungle between interchanges lines. Lead to reflection in light of the fact that in correspondences lines free, all correspondences lines signal at sixes and sevens, once such reflection sign set off the 485 chip to lose into the difference, happens flaw signal. Our regular arrangement is to RS - 485 transport line An and B in addition to must esteem inclination resistors, then here and there, partition this can avoid disorder flag not know beforehand. Impedance is not string, is with the light from one medium into another medium as a consequence of reflection is similar. Signal in the link impedance is little, however toward the end of a transmission line and sign in the neighbourhood will prompt the shot. To wipe out the impression of the most normally utilized system, is toward the end of the link a jumper and the trademark impedance of the link end resistors of the same reach.
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LED display