The higher the resolution, color depth and frame rate, the more bits need to be transmitted until the maximum bandwidth is reached. Then, the only way to transmit more bits is to add more lanes to the cable or compress the signal. HDMI 2. Active vs. Passive cables have a limited range more on this later. Active cables on the other hand include a signal booster that enables video and audio to be transmitted over longer distances.
Active cables sometimes require a power supply. Consensus seems to be about 50 feet for p and feet for 4K video, but distances of over feet are achievable.
A good practical approach is to try a passive cable and, if you have problems with signal strength, add an in-line signal booster at the receiver end. Active Cables — Length is more definitive in the case of an active cable because signal transmission is designed and tested over the advertised distance.
When transmission distance requirements exceed the limits of passive and active cables, it's time to consider the various forms of signal extension. Greater distances are possible at lower frame rates. HDMI over Fiber — The connectors on fiber HDMI convert conventional electrical inputs to pulses of light that are transmitted at high speed through optical fiber, then converted back to electricity on the receiving end.
Wireless is generally slower than hardwire so make sure the video resolution and frequency is sufficient for your needs. Yes, but not directly. The adapter may require an external power source. It is the PD handshake that establishes an Alt Mode connection. As a general rule, video and audio can be converted from one protocol to another equal or lesser protocol as the table below shows. Protocol conversion requires an adapter. Switches and splitters are often confused and for good reason.
They perform similar functions. A switch takes multiple inputs and lets you choose which one to display on your TV or computer monitor. A splitter does exactly the opposite.
It takes a single video signal and replicates it to multiple displays. Each display will show the same image. Splitters are often classified according to their inputs and outputs. For example, a 2-port splitter might be referred to as "1x2" because it has one input and two outputs.
When choosing a splitter, make sure the output is at the resolution and frequency you want. For example, a boardroom presentation might include Powerpoint slides and video from a streaming service like YouTube or Vimeo. A matrix switch has multiple inputs AND outputs. For example, a 9x2 matrix switch has 9 inputs and 2 outputs. Another variation on the many-to-one theme is the Multiviewer , which consolidates a number of video inputs on a single monitor.
Multiviewers are found in broadcast control rooms and video surveillance systems. No, an HDMI splitter takes one video signal and replicates it to multiple displays so each display shows the same image. This is known as "mirroring". Here are your options for extending your desktop:. A power surge is typically a brief increase in voltage due to, for example, an overloaded circuit, power outage or lightning strike.
A surge protector detects excess voltage and safely diverts it through the building's grounding system so it doesn't damage connected equipment.
HDMI surge protectors are intended to supplement primary surge protection and are installed "in line" between a video source and display.
Important: surge protectors do not provide two-way protection against power spikes. If you want to protect both source and display, you should install two surge protectors: one with its output facing the video source and one with output facing the display. Do in-line surge protectors degrade the HDMI signal?
All in-line surge protectors introduce a small impedance into the line and a capacitance across the line. An HDMI signal includes both video and audio, which is convenient because you need only one cable to connect a cable box, game console or streaming device to your television.
But if you want to play audio through an older analog sound system that doesn't have HDMI support, you will need to separate the audio track from the video.
That's where an audio extractor comes in. Depending on the capabilities of the audio extractor, you may have the choice of compressed or uncompressed LPCM audio outputs, for example, 3. When buying an audio extractor, make sure the video and audio output formats match the capabilities of your television and sound system. HDMI has been widely adopted by consumer electronics manufacturers. If you need to connect a Blu-Ray player, cable box, game console or streaming device to your television, HDMI is the logical choice.
Your options for connecting a computer monitor to your laptop or desktop PC may be less clear. Which one will give you the best results? In terms of image quality, there isn't much difference. DisplayPort 2. However, if you need multiple displays, you can daisy-chain three 4K monitors 90 Hz or two 8K displays Hz.
With 8K TVs and cameras now readily available, first adopters are turning their attention to even higher resolutions, including 10K and 16K, and refresh rates above 60 Hz. Bandwidth is the biggest barrier to higher resolutions and refresh rates. Ths latest generation of Premium High Speed Cables are the highest quality material and build versions available and, from launch, will carry an understandably higher price than earlier standards of HDMI leads.
However, as with all technology products, as more and more Premium HDMI cables join the market, prices will begin to fall closer to those of Standard and Highspeed. However, the increase in price ensures much greater performance guarantees for faultless 4k UHD 18Gbps audio video content transmisssion. With over 50 years experience in supply and system design for many of the UK's largest, high profile audio projects, our AV experts provide a unique level of technical support and customer service.
Subscribe to our YouTube channel now at howtoav. Login Log in to your Account. Toggle navigation. What are the different standards of HDMI? HDMI 1. In discussions with several audio equipment manufacturers since the original publication of this article, I've been told by all of them that the DAC in the receiver is going to have a far greater effect on the sound than the jitter in the transmission. Before you leap on that, keep in mind that the DAC has a smaller effect on the sound than the amp, the speakers, and definitely less than the room itself.
Oh, and in case that wasn't clear, the jitter is inherent in the HDMI transmission itself. The cable isn't going to have any effect. Likely transmission The big "if" that I've been repeating is "if the signal gets there. Over longer runs, the answer is less clear-cut. The variables of the transmitter and receiver combo in the source and display, plus any repeaters you have in the mix like a receiver , mean that not every long HDMI cable can handle all the data.
By long, I mean 50 feet or more. If you need to run long HDMI cables, it's a safe bet you're going to run it through a wall. If so, it is vital you test the cable with all your equipment before you install it. Plus, as tempting as it is to get the cheapest cable that will work in this case, just because a cable works with all your current gear, doesn't necessarily mean it will work with your future gear. That's it. Standard-speed cables are rated to carry up to i. Many standard-speed cables can probably handle p, they're just not rated for it.
Check out my article on how 3D content works for more info on that. Honestly, though, if you're buying the right kind of cables i. When cable manufacturers claim their cables are "Made for Hz" they are lying to you. The conversion to or Hz is done inside the TV.
There is no such thing as a Hz or Hz signal. This is the highest-bandwidth, non-computer source you can have, and even it is only 60 Hz check out i and p are the same resolution and What is refresh rate?
More expensive cables can be more rugged, with thicker casings, a beefy connector, and higher potential durability. If and how much more this is worth is up to you. Personally I find the bulky plugs of many "high-end" HDMI cables to be a nuisance, either falling out, or pulling on the connector in such a way that could potentially pose problems in the long run. Better made cables may even last longer.
Over these short distances, even the cheapest HDMI cables are going to work. And if they work, as you've read, it means you're getting perfect image and sound. Even over long runs, most cheap cables can do the job just fine.
In the year and a half since we first published this article, the most common misunderstanding comes from those used to an analog cable mentality. They understand that over any cable, there is a high likelihood of signal degradation. As in, the signal received by the television isn't as strong or exactly the same as what leaves the source. However, unlike analog cables, there is no linear correlation between signal degradation and picture degradation.
The picture will be perfect up to the point where there's not enough signal to create the image. At that point, you'll have nothing. In the occasional situation where you get sparkles as mentioned above , this is proof of that the system works but the cable doesn't.
You can't change what the pixel is. It can only be exactly the right pixel as sent by the source, or no pixel at all. Or are they -- full test". Got a question for Geoff? Still have a question? Send him an e-mail! He won't tell you which TV to buy, but he might use your letter in a future article. Be respectful, keep it civil and stay on topic.
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