Re:Audiophiles in Japan Are Installing Their Own Power Poles
by chaboud on Saturday December 29, 2018 @03:07AM
(#18782582)
"If you can see an HDMI signal with white blinking dots everywhere, you can be confident that the cable is not altering the signal in any really detectable way."
I have seen an HDMI transmission with white blinking pixels at content edges that were not from the original signal. I ran test signal through that source and verified the errors on an HDMI waveform monitor, after which I tested the cable and threw it away.
HDMI video is not magically impervious to error because it is digital. It's actually a pretty straightforward transmission scheme.
This was while working on an HDMI-output device, working with team members who had written the original HDMI specifications (so, yes, I've read them).
It is possible to have subtle degradation in HDMI-delivered content. It's rare, but possible. As one might expect, comprehensive failures (e.g. black screen, periodic HDCP key mismatch) are far more common, as are negotiation/configuration failures (e.g. wrong resolution, wrong framerate, wrong color space).
I have seen an HDMI transmission with white blinking pixels at content edges that were not from the original signal. I ran test signal through that source and verified the errors on an HDMI waveform monitor, after which I tested the cable and threw it away.
HDMI video is not magically impervious to error because it is digital. It's actually a pretty straightforward transmission scheme.
This was while working on an HDMI-output device, working with team members who had written the original HDMI specifications (so, yes, I've read them).
It is possible to have subtle degradation in HDMI-delivered content. It's rare, but possible. As one might expect, comprehensive failures (e.g. black screen, periodic HDCP key mismatch) are far more common, as are negotiation/configuration failures (e.g. wrong resolution, wrong framerate, wrong color space).