DVI-D connectors can only transfer digital video signals. DVI-I connectors do not convert analog and digital signals but can accept digital or analog signals — just not both at the same time.
If a video card, monitor and cable all have DVI-I connections with the ability to support both analog and digital signals, one mode of operation has to be selected. Find DVI Products here.
The multiviewer allows video from four different HDMI 2. Continue Reading. Windows 11 SE Explained. Windows 11 SE. Microsoft Default Browser Firefox. Google's New Pet Art. Robinhood Hack Find Downloaded Files on an iPhone. Use Your iPhone as a Webcam. Hide Private Photos on iPhone. Take Screenshot by Tapping Back of iPhone. Should You Upgrade to Windows 11?
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Disable Startup Programs in Windows. Where to Download Windows Legally. Find Your Lost Product Keys. The Best Tech Newsletter Anywhere Join , subscribers and get a daily digest of news, geek trivia, and our feature articles. Images Credit Wikimedia link and link. How-To Geek is where you turn when you want experts to explain technology. Since we launched in , our articles have been read more than 1 billion times. Want to know more? DVI-I has both digital and analog pins so it can carry either signal.
However, it cannot convert digital to analog or analog to digital. Fortunately, DVI-A has, for the most part, disappeared from our industry, and we do not see it anymore. DVI-I exists in very few products. Primarily where we see DVI-I being used today is in some digital signage devices where there is a relatively small footprint and we need to have the ability for both analog and digital connections. We also see it on some codec devices so we can decide whether we want to have an analog or digital connection.
With the introduction of the analog sunset in and the introduction of software that is down-limiting the amount of resolution we can get from commercial analog sources even today in computers, the days of analog video really are numbered as a universal solution.
We will soon be moving towards an all-digital world in the video environment. Since DVI-I seems to be fading out, we will probably only see it used in some of the more limited, special applications where you select analog or digital and then connect appropriately. DVI-D is digital, and is a video standard. Single link can now support up to x at 75Hz over a single link. We primarily see DVI-D on medical imaging devices and on some computer devices where we need a very high resolution, orhave multiple screen capabilities.
By and large we are seeing DVI-D movinginto technology that will eventually take its place. In other words, I can hit the play button on my DVD player, and it should turn on my display and my other devices while going directly to the correct input. We will discuss this more in depth later,because it's a very interesting feature that you are going to see being leveraged more and more as new products come to market.
In addition to CEC, audio capability was also added. HDMI was designed specifically for the consumer electronics industry. The challenge was finding a way to combine it all into one plug, and that is exactly what HDMI did.
When HDMI was created, several of the features that were developed were really quite amazing. First and foremost, a compact disc operates on something called the Redbook Standard. We all know that a compact disc operates on bit words sampled at 44, samples per second. When creating HDMI, there was a desire to make the sound better than what is on a compact disc. Therefore, one of the first things addressed by the committee tasked with designing these particular capabilities was the decision to move this to a bit word length.
In the digital audio environment the word length, bit or bit, describes amplitude. A compact disc can give an 88db signal to noise ratio. This is very good, but not far beyond what an analog reel-to-reel or a very high quality analog recording was capable of. A bit word length gives up to a db signal to noise ratio or dynamic range, which is significantly greater than anything that can be done in the analog world.
It basically provides a wider palette to paint those sound pictures on, resulting in much more clarity and a much greater separation between the softest and the loudest sounds. This makes it very exciting when we watch action movies, allowing for us to have a very refined sound. The other thing that happened with the HDMI standard is that it increased from Once again, if we think back to our early engineering classes, we recognize that sampling is described by something called Nyquist's Theorem or Rate.
Nyquist's Theorem says that if we want to have a 20kHz high frequency sound, which is a very high frequency sound that is on the edge of what the human ear is capable of hearing, we need to have a minimum of twice that in sampling or When that standard was created for compact discs way back in the early s, it brought with it a host of problems.
The most significant problem was that we had to filter out some very high frequency information, resulting in a much higher sampling rate versus a much higher bandwidth. So needless to say, HDMI does represent absolute state of the art sound quality with up to eight channels of uncompressed audio going over this single connector. That truly is as good as it gets.
When we say what we are listening to sounds like the master tape, we are in fact hearing the master sound track. For instance, this is used at Skywalker Ranch, the soundstage where they mixed movies like The Abyss and the Star Wars series. The result is master quality sound, and HDMI is the only place you can get it. So, often times it was not HDCP compliant. It did not have the high definition content protection, or the EDID table that was written in the same way as consumer gear, so there was a incompatibility issue.
Your DVD player was speaking French, your cable or satellite receiver was speaking Italian, and they were unable to communicate with one another. Fortunately this is where we are today, and this means you will not experience compatibility problems between HDMI and DVI-D on anyof your contemporary gear.
From a practical perspective we are now working at level 1. When we first started, HDMI 1. For the most part HDMI 1. However, you do need the right chipsets in order to implement some of these new features. Let's take a look at what happened with HDMI 1. The idea behind CEC was to provide the ability to press the "play" button on the DVD player which would automatically turn on the receiver as well as the display, then go to the correct input, the correct resolution, and the correct surround sound format and begin playing.
However, with the advent of HDMI 1. This is very important to us at C2G because of our fantastic new product, the new Media Gateway, a device that will be available for shipment starting in September This solution will really allow you to have both analog and digital inputs to any digital-based system.
The TruLink Media Gateway becomes a universal access point for all media. On a commercial panel you have to get into a sub-menu to turn CEC compliance on or off because you don't want these CEC commands interfering with RS or other commands that might be coming from a Crestron, AMX or Control 4 type control system.
In the consumer world, CEC is by nature always on. Again, you can access a service menu and turn it off. There are very few differences today between commercialand consumer monitors, with the sole exception being that in some commercial monitors we have power supplies that are designed for a hour or hour heavy duty cycle operation.
However, the compliance is the same. So, here is what happened when we added the complexity of HDMI 1. This HDMI 1. Remember how I said that for EDID information to really operate we have to constantly update that firmware Well, that would require almost every device to have an Internet connection. Even the display panels have an Ethernet input. The other part is to make sure the firmware that resides on these sets is always compatible with new devices.
First, HDMI 1. The specification changes the pin-out of that conductor cable and allows some of those pins to carry up to Mbps of Ethernet information between devices. This does require that both the source and the display device have HDMI 1. It truly is a variation on technology that is self-contained. Second, HDMI added another feature - the audio return channel. This does not require a new cable but does require both the source and reception device tobe HDMI 1.
For instance, let's use this example: I have a television in the living room and I'm connected to an off-air antenna. In this case, more than likely I would have some sort of lip sync off-set or time delay because of latency. It was sophisticated; it was complicated; and it did not work really well. Where is this important in a commercial installation? Think once again about a corporate board room presentation system. Do we want this to be a complex set up that involves the need for an external tuner and all these other devices, or would we prefer to keep it simple so that it's easy and intuitive?
Perhaps we have a scenario where we are trying to take the output of a local tuner and incorporate it into a codec so that it can run through a digital signage product or reach multiple buildings. That's where we'll experience some real challenges. Some codecs have internal software that prevents echoes. Sometimes those echoes can be a result of latency in electronics.
As a result, we may end up eliminating the sound we actually want. Once again, this HDMI bi-directional capability can eliminate some latency and allow a much greater level of interoperability between devices. Third, HDMI 1. Personally, I think just about everyone in the consumer world and the commercial world has gotten a big yawn out of this technology.
I do not expect 3D to necessarily take over corporate board room type projection systems, but I do expect 3D to be very important in the realm of digital signage applications. Fourth, HDMI 1. Don't get too excited and run out and buy Blu-ray players that will play that level of resolution.
I seriously doubt we will have an abundance of pre-recorded content at that high of a resolution. However, we might see something like that for gaming and simulation systems where we want the highest resolution possible. Also keep in mind that there are limitations to the level of resolution that the human eye can actually see.
Fifth, HDMI 1. Last, but not least, the new HDMI 1. Unfortunately, it is designed for the automotive industry. It is not something we will see being utilized for indoor rack-mounted gear such as playersand displays, etc.
I have mentioned that one of the downfalls of HDMI is that there is a friction fit connector. While it is true that the connector can be a real challenge if you are trying to connect HDMI into something that is on a moving arm, an articulated arm or a swing-out arm.
However, proper strain relief can reduce those problems. By and large, we do not see a lot of problems with HDMI connectors in rack-mounted applications. This allows you to keep all of this firmware up to date on all of your devices, a very nice feature for certain applications. Think about how that might be used, for example, in a small scale digital signage application, where I simply want to have RF.
This will allow me to come out to a small amplifier to drive a local source. Now, while HDMI was progressing, and we saw the industry moving towards much more elegant implementations of digital video, the guys in the computer world were not sitting back ignoring all of this. They were paying some attention. A number of years ago they came up with a solution called DisplayPort. DisplayPort was originally created to connect a computer driver to a computer display device.
It was of particular importance inside of a laptop because DisplayPort is asynchronous. That clock information is embedded in what would be the Red, Green, Blue. What this means is that it operates similar to USB and can handle multiple signals going to multiple devices all goingover the same cable. What happened in the laptop is that every laptop computer, up until the advent of DisplayPort, had something called an LVDS driver.
The LVDS driver is what drove the internal display in the laptop. The folks building computers realized if they could get rid of the LVDS driver, they could get rid of an entire chipset. This meant that they could design smaller and lighter laptops that were less expensive and that used less battery power because there would be fewer devices to power. Another advantage of DisplayPort is that it is royalty-free. The expense can be quite significant when you start thinking in terms of a device that has perhaps eight to ten HDMI inputs, and you are manufacturing a million of them per year.
It does have a locking connector, the cable is slim and it is shaped very much like HDMI. The conventional wisdom said, "Let's give it the ability to handle bi-directional LAN capability, the ability to handle up-stream audio capability and the opportunity to do some other things.
It is wholly unique. However, because DisplayPort is malleable andcan do so many things, it can output an HDMI signal so any device, for instance, like the Dell laptop I am using right now to write this article, can have a DisplayPort output.
Here is what DisplayPort did that was really cool. First, it kept the bidirectional capability of HDMI 1. They had smaller cables based on micropackage protocol not on serial data stream which, meant that this device could operate in a star configuration or in a serial configuration. This is what happened with the specification version 1. So we will be seeing an advancement of DisplayPort driven by the computer manufacturing industry.
What DisplayPort does as a result of its asynchronous capability, that is so incredibly unique, is multi-streaming. Imagine coming out of something like a digital signage device or coming outof a computer is a single cable going into a single 50" panel.
Then from that panel it goes to a second 50" panel, and from the second to a third, and from third to a fourth. So with nothing more than four pieces of wire, I can power four 50" panels and get four entirely separate x images. This requires a lot of processing power, but just think how much that would simplify something like a small scale digital signage video wall where I'm going to do a 2 x 2 output. All I need is wire to hook that up, and the way those images work together to create a single larger image or fracture to create smaller images is part of the content.
This multi-streaming.
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