HDMI HD line can transmit far? The transmission distance of -HDMI line

The maximum transmission distance of HDMI line is 20 meters, refers to the natural transmission chip signal amplification without any distance in the natural state, general manufacturers HDMI lines are 20 metres in length. And add the amplifying chip HDMI line can reach 50 metres in length. Although the HDMI line of the theory of the longest distance is 25-28 meters, but actual transmission conductor material and environmental impact can only reach 20 meters of HD transmission. Why HDMI line transmission distance so small? Signal properties of the HDMI transmission line and related.

Signal transmission cable we usually use two kinds of nature, one is the analog signal, a digital signal. HDMI transmission line with belongs to digital signal. On behalf of the cable pure analog signal is VGA line. Signal as the transmission distance increases gradually attenuation in the transmission process are. But the VGA transmission line can be up to 50 meters, the transmission distance is far higher than that of HDMI line.

The use of VGA line test analog signal transmission, with the increase of the distance from the signal transmission decreases linearly with the HDMI line; found when testing, digital signal transmission is not like the analog signal as linear steady decline,but the exponential function like drop, the final length of signal in the 22 meters of the start of serious loss. Because of this, sowhen choosing HDMI line cable shorter is better.