Lightware UMX-OPT-TX150R, Руководство пользователя

Страница: 15 / 107

UMX-OPT-TX150R
User’s Manual
Section 2. General description Page 15 / 107
2.8. Pixel Accurate Reclocking
Signal reclocking is an essential important procedure in digital signal transmission. After
passing the reclocking circuit, the signal becomes stable and jitter-free, and can be
transmitted over more equipment like processors, or event controllers. Without reclocking,
sparkles, noise and jaggies can be seen on the image.
Lightware’s sophisticated Pixel Accurate Reclocking technology fixes more problems than
general TMDS reclocking. It removes not only intra-pair skew but inter-pair skew as well.
The Pixel Accurate Reclocking circuit eliminates the following errors:
Intra-pair skew: skew between the + and - wires within a differential wire pair (e.g.
Data2-
and Data2+). It’s caused by different wire lengths or slightly
different wire construction (impedance mismatch) in HDMI cable. It
results in jitter.
Inter-pair skew:
skew between two differential wire pairs in a cable. It’s caused by
different wire pair lengths or different number of twists in the HDMI
cable. Too much inter-pair skew results in color shift in the picture or
sync loss.
Jitter: signal instability in the time domain. The time difference between two
signal transitions should be a fix value, but noise and other effects
cause variations.
Noise: electromagnetic interference between other electronic devices such as
mobile phones, motors, etc. and the HDMI cable are coupled onto the
signal. Too much noise results in increased jitter.
The Pixel Accurate Reclocking circuit completely regenerates the original video signal
and outputs a strong, high-quality digital signal that conforms to the HDMI specification.