HDMI（高清多媒体接口(High Definition Multimedia Interface)）电缆现在如此普遍，以至于很容易忘记该电缆标准在首次推出时的革命性。一条同时传输高清视频和多声道声音信息的全数字电缆是我们迄今为止一直在使用的简陋模拟电缆解决方案的一大进步。
您可能不会过多考虑HDMI电缆。您的控制台或蓝光(BluRay)播放器可能在包装盒中附带一个，或者您只需从当地商店购买一个，插上电源，就再也不用担心了。然而，许多人可能不知道的是，与大多数人使用的大约一米长的电缆相比，您可以在更长的距离 上使用长HDMI电缆。(HDMI)
通过延长您的HDMI电缆，您将开启您可能从未考虑过的各种有趣的可能性。不过，在我们开始之前，让我们确定您可以制作多长时间的HDMI电缆。
HDMI线可以多长？(How Long Can HDMI Cables Be?)
标准 HDMI(Standard HDMI)电缆的长度最长可达 20 米，也就是刚刚超过 65 英尺。除了最雄心勃勃的项目之外，这实际上应该足够长，但是您可以使用合适的设备走更长的时间。
通过使用HDMI中继器或其他有源供电的解决方案，您可以达到一些疯狂的长度。高端解决方案甚至可以通过以太网电缆传输(Ethernet)HDMI信号，尽管我们正在走出家庭级解决方案的领域。
请记住，在某些情况下，使用HDMI中继器或真正长的HDMI电缆会对延迟产生显着影响，这对于视频游戏等应用程序来说非常重要，但对于家庭影院则没有那么重要。
安静的工作和游戏(Silent Work & Gaming)
游戏 PC(Gaming PCs)、笔记本电脑和游戏机的声音可能非常大，因此，如果您不喜欢嘈杂的风扇破坏您的工作或游戏，您可以使用一根长HDMI电缆来传输来自另一个房间、壁橱或其他障碍物的信号出声。
结合无线控制器、键盘和鼠标，您几乎没有理由物理访问机器，特别是如果您主要播放数字标题。
这是未来可能会更适合光纤Thunderbolt电缆的东西，但现在它是一种非常昂贵且罕见的解决方案。
让您的控制台靠近(Keep Your Console Close By)
你也可以做相反的事情，让你的控制台(console)（或其他设备）靠近你坐的地方，然后用一根长的HDMI电缆连接到远处的显示器。这意味着您可以轻松更换光盘、访问端口并正常操作机器。
如果您在没有支架空间的地方安装了壁挂式屏幕，则此方案很有用。因此，您不妨将控制台放在触手可及的地方。
连接投影仪(Hooking Up a Projector)
家庭(Home)影院投影机不像以前那么受欢迎，这要归功于相对实惠的大屏幕电视(TVs)，但如果您想要那种影院体验，仍然没有替代品。问题是，虽然投影屏幕可能在前面，但投影仪本身需要在房间的另一端。
您的 AV 设备必须在您面前(front )才能使用您的遥控器。如此长的HDMI电缆对于将投影仪和其他设备放置在家庭影院中的正确位置是非常宝贵的。
使用 HDMI-CEC 控制远程设备(Use HDMI-CEC To Control Remote Equipment)
HDMI不是一条单行道。多亏了一种叫做HDMI-CEC的东西，您实际上可以控制通过HDMI连接到电视的设备。例如，您的电视可以打开连接的游戏机，使用其遥控器在蓝光(BluRay)播放器或任何其他连接设备支持的菜单上工作。
长HDMI线意味着您可以从另一个房间控制这些远程设备，或者如果它们被锁在隔音柜中。这意味着您的显示器现在还兼作远程扩展器，您不必担心无线信号会穿过墙壁以使其正常工作。
用分路器镜像两台电视(Mirror Two TVs With a Splitter)
这是长HDMI电缆的一个非常酷的应用。您可以购买一个HDMI 分配器(HDMI splitter)，然后将一个信号源同时发送到多个显示器。您可以让两台电视面向不同的方向，或者让不同房间的电视机播放完全相同的节目。更好的是，大多数HDMI分配器也是信号增强器，因此您可以将一根长HDMI电缆馈入其中，然后将两条长电缆馈入其中。
你为什么想做这个？好吧，实际上有很多，尽管在智能电视(TVs)和流媒体服务的世界中，它不一定再有意义了。大多数人仍然使用带有HDMI输出的卫星或有线电视盒。与使用支架相比，使用长电缆拆分HDMI馈送将是一个更好的解决方案
作为铸造的替代品(As a Substitute For Casting)
如果您有合适的智能电视或流媒体盒，(streaming box,)您可以将手机屏幕无线投射到电视上。这非常简洁，但除非事情是最佳的，否则它会导致故障或图像质量差。那么为什么不使用长HDMI线将手机连接到电视呢？
听起来可能有点傻，但是有些流媒体应用程序没有智能电视应用程序，这是在大屏幕上获取图片的更可靠的方式。请(Just)记住，您的手机还需要一个HDMI适配器。
长 HDMI 电缆的替代品(Alternatives To Long HDMI Cables)
直接的电缆连接意味着最少的麻烦，完美的可靠性（如果它首先正常工作），最重要的是，它通常是最便宜的解决方案。这并不意味着您不能尝试一些替代方案。如果您只想观看视频内容，那么将视频无线投射到电视上真的是您所需要的。在这种情况下，延迟(Latency)并不重要，因为观看视频不是一种交互式体验。
如果你真的想无线投射屏幕，还有很多选择。如果您的电视连接了Apple TV 设备，则可以使用AirPlay将您的Mac或 iOS 设备镜像到它。然后是MiraCast，您可以购买加密狗。这本质上是无线HDMI。Chromecast设备也是另一种选择。
根据具体的无线技术，您可能无法接受延迟程度，目前有线HDMI连接仍将是王道。有WiGig等技术，为 VR 等高端应用提供无延迟的无线视频传输。
一旦WiGig等技术成为主流，对HDMI（或任何电缆）的需求可能会成为过去，但现在走这条路既不可靠也不负担得起。所以，就目前而言，不起眼的HDMI线仍然是远距离视频传输的最佳整体解决方案。
6 Cool Ways To Use Long HDMI Cables
HDMI (High Definition Multimеdia Interface) cables are now so commonplace that it’s easy to forget јust how revolutіonary this cable standard wаs when it first launched. Α single all-digital cable that carries both HD video and multi-channel sound informatiоn is a major step up from the janky analogue cable solutions we’d all been using up to that point.
You probably don’t think about HDMI cables all that much. Your console or BluRay player probably came with one in the box or you’d just buy one from the local store, plug it in and never worry about it again. What many people may not know however is that you can use long HDMI cables over much longer distances than the roughly one-meter cables most people use.
By extending your HDMI cables, you’ll open up all sorts of interesting possibilities you may never have considered. Before we get to that though, let’s establish just how long you can make an HDMI cable.
How Long Can HDMI Cables Be?
Standard HDMI cables can be bought in lengths up to 20 meters, which is just over 65 feet. That should actually be more than long enough for all but the most ambitious project, but you can go even longer with the right equipment.
By using an HDMI repeater or other actively-powered solution you can hit some insane lengths. High-end solutions can even transmit HDMI signals over Ethernet cables, although we’re moving out of the realm of home-grade solutions.
Just keep in mind that in some cases using HDMI repeaters or truly long HDMI cables can have a noticeable effect on latency, something which matters quite a lot for applications such as video games, but not so much for home cinema.
Silent Work & Gaming
Gaming PCs, laptops and consoles can be pretty loud, so if you don’t like your work or gaming spoiled by noisy fans, you can use a long HDMI cable to run the signal from another room, a closet or some other barrier that blocks out sound.
Combined with a wireless controller, keyboard and mouse you should have little reason to physically access the machine, especially if you mainly play digital titles.
This is something that optical Thunderbolt cables may be better for in future, but right now it’s a pretty expensive and rare solution.
Keep Your Console Close By
You can also do the opposite and have your console (or other device) close to where you’re sitting and then run a long HDMI cable to a distant display. This means you can easily change discs, access ports and generally operate the machine.
This scenario is useful if you have a screen that’s wall-mounted in a place where there’s no space for a stand. So you might as well have your console within easy reach.
Hooking Up a Projector
Home cinema projectors are not as popular as they used to be, thanks to relatively affordable large screen TVs, but if you want that cinema experience there’s still no substitute. The thing is, while the projection screen might be up front, the projector itself needs to be way back at the other end of the room.
Your AV equipment has to be in front of you in order to use your remote. So long HDMI cables are invaluable when it comes to putting the projector and other equipment in the correct spots within your home cinema.
Use HDMI-CEC To Control Remote Equipment
HDMI is not a one-way street. Thanks to something called HDMI-CEC you can actually control devices connected to a TV via HDMI. For example, your TV could switch on a connected game console, use its remote to work the menus on a BluRay player or whatever else the connected device supports.
A long HDMI cable means you can control those distant devices from another room or if they are locked away in a sound-dampened cabinet. It means that your display now also doubles as a remote extender and you don’t have to worry about wireless signals passing through walls in order to make it all work.
Mirror Two TVs With a Splitter
Here’s a very cool application of long HDMI cables. You can buy an HDMI splitter and then take a single source and send it to multiple displays at the same time. You could have two TVs facing different directions or have sets in different rooms play exactly the same feed. Even better, most HDMI splitters are also signal boosters, so you can have a long HDMI cable feed into it and then have two long cables feed out of it.
Why would you want to do this? Well there are actually many, although in a world of smart TVs and streaming services it doesn’t necessarily make all that much sense anymore. Most people still make use of satellite or cable boxes with an HDMI output. Splitting the HDMI feed with long cables would be a much better solution than using a stand
As a Substitute For Casting
If you have the right smart TV or streaming box, you can cast your phone’s screen wirelessly to your TV. This is pretty neat, but unless things are optimal it can lead to glitching or poor image quality. So why not use a long HDMI cable to connect your phone to your TV?
It sounds a little silly maybe, but there are some streaming apps that just don’t have smart TV apps and this is a much more reliable way of getting the picture on the big screen. Just remember that you’ll need an HDMI adapter for your phone as well.
Alternatives To Long HDMI Cables
A direct cable connection means the least number of headaches, flawless reliability (if it works properly in the first place) and, best of all, it’s often the cheapest solution around. That doesn’t mean you can’t try a few alternatives. If all you want to do is watch video content, then casting video wirelessly to a TV is really all you need. Latency doesn’t matter in this case, since watching a video is not an interactive experience.
If you actually want to cast a screen wirelessly there are also plenty of options. If you have an Apple TV device hooked up to your TV, you can use AirPlay to mirror your Mac or iOS device to it. Then there’s MiraCast, which you can buy dongles for. This is essentially wireless HDMI. Chromecast devices are another option as well.
Depending on the specific wireless technology, the level of lag may not be acceptable to you, for now a wired HDMI connection is still going to be king. There are technologies such as WiGig, which provides lag-less wireless video transmission for high-end applications such as VR.
Once technologies such as WiGig become mainstream, the need for HDMI (or any cables) could be a thing of the past, but right now it’s neither reliable nor affordable to go this way. So, for now, the humble HDMI cord is still the best overall solution for long-distance video transmission.
