One wonders if consumers have been confused by these completely different vendor brands for the same thing, it isn't a scenario that occurs fairly often with consumer interconnects. The television modified all the things about the way customers work together with AV equipment: now we all stay on the sofa. Within the era of vinyl, once you had to get off the couch to start a report anyway, remote controls weren't such an necessary part of the stereo market. There are, in fact, promised options on the market. See Henry Ott, Noise Reduction Techniques in Electronic Systems, 2nd ed., John Wiley & Sons, 1988.) There are shielding approaches that present a low floor switch impedance at high frequencies, whereas at the identical time providing a much greater impedance at 60 Hz. The effective source impedance was about one ohm, if I recall. In the example you cite, the bottom switch impedance at one finish of the cable can be one hundred ohms, rendering the shield ineffective. USB started out as a reasonably pure and simple serial link, and then extra use-cases have been piled on, culminating in the wedding of two fully different interconnects (USB and Thunderbolt) in a single bodily connector. HDMI actually involves this diploma of complexity more truthfully than USB.
A pair more are used for the audio return channel or ethernet (you can't do both at the identical time) characteristic of HDMI. That means that the receiver is sending video to the Tv, receiving audio from the Tv via audio return channel (ARC), and each are exchanging commands. Messages have a simple format: a one-byte header with the sending and receiving addresses, a one-byte opcode, after which no matter bytes are expected as parameters to the opcode. In the STB situation, one thing like Xfinity X1 or Dish Hopper, we have an inversion of management: the only remote you'll need, they hope, shield control cable is the STB's remote. As some evidence of this fight, consider the case of Xfinity Xumo (formerly Flex), the compact STB that Xfinity provides to its internet customers totally free. Wikipedia presents the names nexTViewLink (horrible), SmartLink (mediocre), Q-Link (lazy), and EasyLink (mediocre once more). Philips EasyLink continues to be with us. Surprisingly unstandardized in that curious way where there are few sufficient IR transceiver ICs that a whole lot of devices truly are appropriate (consider the ubiquitous Philips protocol), but nobody documents it and detailed button codes usually range in small and annoying ways. This was one of many principal struggles confronted by the American residence for decades.
Over the decades since, it has evolved into a technique to deal with a business drawback: everybody that sells you AV equipment prefers that you passionately navigate their on-display menus whereas completely forgetting about those of your other components. Samsung TVs. That doesn't stop Samsung from pushing their very own branding of their menus and port labeling, although. I'm largely kidding about this emotional interpretation of the scenario, however clearly the Tv producer does have an incentive to distract your consideration from the STB, which probably has something to do with the tendency of Smart TVs to pop up plenty of on-screen chrome whenever you turn them on. Other AV gadgets like house theater receivers almost universally have CEC support. This all sounds pretty nice - maybe you’d prefer to document it? These remotes, usually thrown in with dwelling theater receivers as a perk, have some mixture of a database of distant protocols pre-reverse-engineered by the producer and a "be taught" mode through which they'll file unknown protocols for naive playback. The AV receiver business has been surprisingly unambitious about capturing Platform Revenue, probably as a result of soundbars have pretty much eradicated the whole lot but increased-end, "audiophile"-centered manufacturers. In these sorts of configurations, the house theater receiver is often used for at least some video switching.
And different elements of CEC are designed to accommodate these sorts of more complex networks. CEC might be utilized in rather more complex eventualities. See mods for extra data. See the update docs for extra infomation. In the event you didn't, it might not, or at least setup can be extra complicated. CEC even has a reasonably advanced addressing mechanism to take advantage. Conceptually you can even use the Tv to regulate non-video functions. For instance, when you use a Tv with a stereo receiver or soundbar, it ought to ahead volume up/down commands from the remote to the audio gadget via System Audio Control. For example, the receiver can use CEC to turn on the Tv when a video input is chosen. Considering the checklist of high-degree options within the specification, "One Touch Play" signifies that a machine can point out that it has video to show (causing a Tv to turn on and choose that input) whereas "System Standby" means that a machine being turned off can inform the other devices on the bus to turn off as properly.
>>>2024-06-02 Consumer Electronics Control (PDF)
by Darrell Henn (2025-01-21)
One wonders if consumers have been confused by these completely different vendor brands for the same thing, it isn't a scenario that occurs fairly often with consumer interconnects. The television modified all the things about the way customers work together with AV equipment: now we all stay on the sofa. Within the era of vinyl, once you had to get off the couch to start a report anyway, remote controls weren't such an necessary part of the stereo market. There are, in fact, promised options on the market. See Henry Ott, Noise Reduction Techniques in Electronic Systems, 2nd ed., John Wiley & Sons, 1988.) There are shielding approaches that present a low floor switch impedance at high frequencies, whereas at the identical time providing a much greater impedance at 60 Hz. The effective source impedance was about one ohm, if I recall. In the example you cite, the bottom switch impedance at one finish of the cable can be one hundred ohms, rendering the shield ineffective. USB started out as a reasonably pure and simple serial link, and then extra use-cases have been piled on, culminating in the wedding of two fully different interconnects (USB and Thunderbolt) in a single bodily connector. HDMI actually involves this diploma of complexity more truthfully than USB.
A pair more are used for the audio return channel or ethernet (you can't do both at the identical time) characteristic of HDMI. That means that the receiver is sending video to the Tv, receiving audio from the Tv via audio return channel (ARC), and each are exchanging commands. Messages have a simple format: a one-byte header with the sending and receiving addresses, a one-byte opcode, after which no matter bytes are expected as parameters to the opcode. In the STB situation, one thing like Xfinity X1 or Dish Hopper, we have an inversion of management: the only remote you'll need, they hope, shield control cable is the STB's remote. As some evidence of this fight, consider the case of Xfinity Xumo (formerly Flex), the compact STB that Xfinity provides to its internet customers totally free. Wikipedia presents the names nexTViewLink (horrible), SmartLink (mediocre), Q-Link (lazy), and EasyLink (mediocre once more). Philips EasyLink continues to be with us. Surprisingly unstandardized in that curious way where there are few sufficient IR transceiver ICs that a whole lot of devices truly are appropriate (consider the ubiquitous Philips protocol), but nobody documents it and detailed button codes usually range in small and annoying ways. This was one of many principal struggles confronted by the American residence for decades.
Over the decades since, it has evolved into a technique to deal with a business drawback: everybody that sells you AV equipment prefers that you passionately navigate their on-display menus whereas completely forgetting about those of your other components. Samsung TVs. That doesn't stop Samsung from pushing their very own branding of their menus and port labeling, although. I'm largely kidding about this emotional interpretation of the scenario, however clearly the Tv producer does have an incentive to distract your consideration from the STB, which probably has something to do with the tendency of Smart TVs to pop up plenty of on-screen chrome whenever you turn them on. Other AV gadgets like house theater receivers almost universally have CEC support. This all sounds pretty nice - maybe you’d prefer to document it? These remotes, usually thrown in with dwelling theater receivers as a perk, have some mixture of a database of distant protocols pre-reverse-engineered by the producer and a "be taught" mode through which they'll file unknown protocols for naive playback. The AV receiver business has been surprisingly unambitious about capturing Platform Revenue, probably as a result of soundbars have pretty much eradicated the whole lot but increased-end, "audiophile"-centered manufacturers. In these sorts of configurations, the house theater receiver is often used for at least some video switching.
And different elements of CEC are designed to accommodate these sorts of more complex networks. CEC might be utilized in rather more complex eventualities. See mods for extra data. See the update docs for extra infomation. In the event you didn't, it might not, or at least setup can be extra complicated. CEC even has a reasonably advanced addressing mechanism to take advantage. Conceptually you can even use the Tv to regulate non-video functions. For instance, when you use a Tv with a stereo receiver or soundbar, it ought to ahead volume up/down commands from the remote to the audio gadget via System Audio Control. For example, the receiver can use CEC to turn on the Tv when a video input is chosen. Considering the checklist of high-degree options within the specification, "One Touch Play" signifies that a machine can point out that it has video to show (causing a Tv to turn on and choose that input) whereas "System Standby" means that a machine being turned off can inform the other devices on the bus to turn off as properly.