If you need a wireless HDMI transmitter — but all of the sales copy out there looks like it was written in a foreign language — don’t panic. You’ll be able to do all of the comparison shopping you want, as soon as you understand the answers to these 4 questions:
1. “How does latency affect the final product?”
If the fine print on your potential wireless HDMI transmitter brags about having teeny-tiny latency, that’s a good thing. That’s because latency is the time it takes for your audio and video to travel from Point A to Point B. So, the higher your transmitter’s latency is, the longer you’ll have to wait for the finished product.
Remember, audio and video are both clumps of data. In order for them to go from your transmitter to your receiver, the transmitter has to process all of that data. So, the faster your transmitter can “think”, the faster you’ll see things pop up on your screen.
Since your data will be travelling from one place to another, you’ll never be able to find a wireless HDMI transmitter that doesn’t come with ANY latency. The best you can ever hope to do is one millisecond or less.
2. “Do I need a license to use one of these?”
Wireless HDMI transmitters will use 5 GHz frequencies to send data. Even though these frequencies are the same ones that government agencies and weather radars use, you don’t need to get a license to transmit audio and video on them. That means there won’t be any red tape to navigate before you get your transmitter up and running. The only thing you’ll be responsible for is NOT interfering with any of the official data that’s being transmitted.
3. “How do I know which frequency to use?”
OK, so you can’t trample on the government’s frequencies, but how exactly are you supposed to know which ones they’re using? Simple! All you need is a wireless HDMI transmitter that comes with dynamic frequency selection.
“Dynamic frequency selection” is a fancy name for a very basic process. It means that your transmitter is going to analyze all of the frequencies before it sends any data, so that it knows which frequencies have a bunch of traffic on them. With dynamic frequency selection, your transmitter can also tell if there’s a lot of interference on a specific frequency. As a result, it knows which one will transmit your data in the most efficient way possible.
But since frequency traffic and interference are always changing, you need a transmitter that can adapt on the fly. That’s where the “dynamic” part comes in. One day, a certain frequency may offer the best route for your data, but it could be totally clogged the next day. As long as you’ve got a transmitter that’s smart enough to figure it all out, you’ll never have to worry about slowing your data down — or getting in the way of any official business.
4. “What on earth is WHDI?”
If you’re a little confused by all of the abbreviations you’re seeing in the fine print of your wireless transmitter’s description, you’re not alone. A good transmitter will mention “WHDI”, which is short for “Wireless Home Digital Interface”. All this means is that you’ll be able to transmit uncompressed video to any compatible device — like an HDTV or Blu-Ray player.