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In Reply to: RE: Tightening HDMI Connection with Teflon Tape = Improved Audio/ Video Quality posted by Dryginger2 on November 23, 2014 at 12:05:15
I'm curious - HDMI signals (audio and video) are digitally encoded, not analog signals. Unless the connection was so poor prior to this mod that you were getting bit errors (data corruption) how is there *any* possible room for improvement? It doesn't add up.
Follow Ups:
Why not install a new connector or if you solder a lot , you have those hooks, which the dentist also uses. They are perfect for binding the connections, but i had the same with the usb port, wihich a good one is made for 500 times unplugged and plug in, but with the external audiocard, pushing and pulling which that shitty oyaide useless cable . So at the and replaced the usb ports and the powerplug... but ain't it your cable ? , is it a lot of weight , which hangs on the connector?..
Ask before you buy, the component list....the outside ain't the most important
Sherwood,
Thank you for your response. Am just a tester reporting what I see/ hear and you may be technically-qualified but HDMI does pack 19 high-speed data transmissions (18 GB per second with HDMI-2) through a connector whose male inserting head by poor design is broad, shallow and loose-fitting allowing sideways motion that doubtless produces vibration / micro-arcing of its pins. The introduction of Teflon tape eliminates much of the sideways motion and resulting degradation. When looking at all the timing information being transmitted below, it's not surprising to me that removing the motion from the HDMI plug handshake would have the beneficial effect regardless of whether the high-speed information is digitally encoded audio/ video rather than analog signals. Express trains have to run on time or there are flat color and sound consequences:-)
DG
Type A receptacle HDMI (male)
Pin out
A diagram of a type A HDMI receptacle, showing 10 pins on the top row and 9 pins on the bottom row (total 19 pins).
Type A receptacle HDMI (male)
Pin 1 TMDS Data2+
Pin 2 TMDS Data2 Shield
Pin 3 TMDS Data2−
Pin 4 TMDS Data1+
Pin 5 TMDS Data1 Shield
Pin 6 TMDS Data1−
Pin 7 TMDS Data0+
Pin 8 TMDS Data0 Shield
Pin 9 TMDS Data0−
Pin 10 TMDS Clock+
Pin 11 TMDS Clock Shield
Pin 12 TMDS Clock−
Pin 13 CEC
Pin 14 Reserved (HDMI 1.0–1.3c), Utility/HEC/ARC (Optional, HDMI 1.4+ with HDMI Ethernet Channel and Audio Return Channel)
Pin 15 SCL (I²C Serial Clock for DDC)
Pin 16 SDA (I²C Serial Data Line for DDC)
Pin 17 DDC/CEC/ARC/HEC Ground
Pin 18 +5 V (max. 0.05 amp)
Pin 19 Hot Plug detect (all versions) and HEC/ARC (Optional, HDMI 1.4+ with HDMI Ethernet Channel and Audio Return Channel)
Yes, modern high-density connectors really do leave a lot to be desired as far as contact surface area, play, durability etc. I certainly wouldn't dispute that.
HDMI, apart from being digitally encoded, is also encrypted for their stupid DRM requirements. My point is that if there were issues with contact intermittance, the symptoms would be severe - complete picture or audio dropout, or at least obvious blocking of the video and garbling of the audio. In reality, when you lose a portion of an encrypted data stream, the whole thing tends to go south.
I really hate HDMI personally. I find that the encryption aspect is really limiting (no distribution amps here, fellas) the cables ungodly expensive, and they can't be run at significant length. IMHO, use HDSDI and separate audio path for best results - if you can handle the cost, HDSDI ain't cheap.
If you really want to know for certain that your modification improved video quality, you'd need to use a colormonkey or some other display calibrating device. Such a device will tell you for certain if anything about your picture quality has changed if you do a before/after comparison.
Sherwood,
Many thanks for the information. Would not like to wander into your forest professing to absent knowledge or might never emerge!
Shortly after publishing this tweak, I found the comprehensive and professional collection of tips from Mr. A.J. van den Hul published in a PDF on the Internet (link below). Beneath I reproduce a small part relating to HDMI/video that shows you are both of the same opinion.
DG
7-9 A word on analog and digital video connections
In analog video signal transport the three-wire component video connection (like our The COMPOLINK 75) is still the best, especially when longer distances (above 5 meters) are concerned.
The currently strongly promoted HDMI connections often suffer from crosstalk in the cable itself and the connectors are in many cases the worst ever produced. But... plenty of new equipment has no component video options anymore.
So, when buying a HDMI cable check that it has good quality connectors, is multiple screened, has low signal attenuation and most importantly: That it is able to flawlessly handle your equipment’s highest video resolution(s) which you intend to use. (This also at the largest cable distance you’re ever going to use). It is therefore wise to check or compare HDMI cable performance at home.
In our program we carry The VDH HDMI and the higher quality VDH HDMI HQ HYBRID.
Because carefully controlled DBT's were not done. That's why.
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