Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [hdmi]

HDMI (High-Definition Multimedia Interface) is a digital audio/video interface.

HDMI is an abbreviation for High-Definition Multimedia Interface, a digital audio/video interface. An HDMI interface has multiple differential serial signals that carry audio and video information, a differential clock signal, and a separate control channel that uses the I2C protocol. The differential audio/video and clock channels use the TMDS protocol. Signals may be encrypted using the HDCP protocol.

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Can a premium HDMI cable outperform a standard cable?

Assuming two cables both conform to the same standards (e.g. HDMI2.0, high-speed, ...) is it possible that a premium cable will outperform a standard cable when using an objective benchmark that measures the quality of picture/audio? Or what…
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Why are FPGAs used so often for HDMI video projects?

If you look through hdmi projects on a site like hackaday, you'll find that just about every one of them involves an FPGA. I don't think I have seen any DIY project with HDMI output that hasn't used an FPGA. But why? As far as I can tell, FPGAs are…
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Why must some HDMI repeaters know the cable length?

I just bought an HDMI repeater and had connectivity issues until I realized the repeater had to know the cable length. It has (1,2,4,8) dip switches that you have to use (binary coded) to set the cable length. What I'm wondering is: How is the cable…
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Can I output a HDMI signal with an Arduino?

There's various articles online detailing how to use an Arduino to output a VGA signal, but can I use it to output a HDMI signal or is it simply not fast enough? It would only be used to display some basic text, nothing in the way of fancy graphics.
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HDMI and I\$^2\$C

I was having a look at the HDMI pinout and I thought: why would they use I\$^2\$C for the display-host communication? My question here is about the design metrics that lead to this choice. HDMI is a quite recent standard while I\$^2\$C is around…
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How does a HDMI source detect whether the sink is native HDMI or connected by a HDMI-DVI adapter?

Over the years of using HDMI monitors, I always had some trouble with the RGB color range, full (0-255) vs limited (16-235). The HDMI Spec v1.3a says, in section 6.6 (page 95, PDF page 111): Black and white levels for video components shall be…
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Could HDMI be potentially used as a power supply alternative for smartphones?

I understand that HDMI's pin 18 carries a +5V charge. Similarly, USB carries 5 volts and this is used to charge many smartphones with a micro/usb connector. Could it possible to build a smartphone that charges with an HDMI port? Would that be…
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How to create an FPGA based Ambilight clone?

Some quick background: Ambilight is a system on some Philips TVs that analyzes the color information on the screen and then sets some LEDs on the back of the display to project the screen's color onto the wall. It is a pretty nifty effect. There are…
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Transmitting HDMI/DVI over an FPGA with no support for TMDS

I'm hoping to be able to output HDMI/DVI-D for my next FGPA project but my FPGA doesn't have native support for TMDS outputs. The FPGA is a Spartan 3E and I believe it only has support for LVDS differential signalling. I read a lot online about…
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Why did a spark occur between my HDMI cable and metal lamp base?

Edit: Update 1/2/22 @ 2:27 UTC: outlet tester shows that all outlets and power strip outlets being used were normal. Update 1/2/22 @ 21:07 UTC: performed various continuity tests which suggest to me that the monitor, HDMI cord, and PC are normal,…
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How to utilize HDMI port on FPGA (basic)

Two questions. I have a Xilinx Spartan 6 FPGA which only has HDMI ins and outs. Is there some sort of guide or pre-written code that I can use to start sending images to the screen? I have no idea how to begin and I have not been able to find…
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Connect an ATmega microcontroller to the HDMI CEC bus

i need a little help with a proper circuit for a connection between a microcontroller and the HDMI CEC bus. Here is the whole plan: Basically I want to use an ATMega microcontroller to decode the CEC bus signal and communicate via the CEC bus with…
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Do-It-Myself KVM?

I have several computers (desktops) in different geographical locations that I want to access remotely. Commercial KVM-over-IP solutions that I found are expensive (more than 200 euros each) and the cheapest ones do not support powering on-off…
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HDMI Cable interfering with mobile phone network

Just had a "spectrum engineering officer" from OFCOM (the UK's communications regulator) visit our office investigating alleged interference from our building with a local cell phone tower. After waving an aerial attached to what looked like a…
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VGA to HDMI converter

I'm making a little project purely as a hobby using a small FPGA breakout board. I'm outputting VGA video which works fine, but would like HDMI output instead so I can connect to a television that has that input but no VGA. I don't believe it's…
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