Difference between revisions of "High Definition Multimedia Interface (HDMI)"
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Unlike PC VGA, HDMI is all digital. HDMI has superior video quality when compared to Component Video, S-Video, and Composit. HDMI includes the audio as well as video, unlike the aforementioned video cable types. | Unlike PC VGA, HDMI is all digital. HDMI has superior video quality when compared to Component Video, S-Video, and Composit. HDMI includes the audio as well as video, unlike the aforementioned video cable types. | ||
| − | HDMI | + | HDMI handles both Video and Sound. With 19 wires wrapped in a single cable, HDMI is able to carry a bandwidth of 5 Gbps (gigabits per second). This is more than twice the bandwidth needed to transmit multi-channel audio and video. |
[[Image:hdmi_connector_examples.jpg]] | [[Image:hdmi_connector_examples.jpg]] | ||
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| + | === DRM === | ||
Because all HDMI devices are HDCP compliant, the HDMI advantage is overshadowed by anti-copy technology that cripples video equipment with HDMI connectors. Consumers should understand the dirty tricks being imposed by Intel, the MPAA, and manufacturers pushing for HDMI dominance. | Because all HDMI devices are HDCP compliant, the HDMI advantage is overshadowed by anti-copy technology that cripples video equipment with HDMI connectors. Consumers should understand the dirty tricks being imposed by Intel, the MPAA, and manufacturers pushing for HDMI dominance. | ||
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* Force the industry to adopt bastardized technology with built-in usage restrictions. | * Force the industry to adopt bastardized technology with built-in usage restrictions. | ||
| − | Pioneer Electronics is one of the culprits pushing HDMI technology, and their DV59-AVi was one of the first to market with HDMI jacks. | + | Pioneer Electronics is one of the culprits pushing HDMI technology, and their DV59-AVi was one of the first to market with HDMI jacks. |
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| + | HDMI has supported HDCP since the beginning, starting at HDCP 1.1 and reaching HDCP 2.2 with HDMI 2.0. HDCP can cause issues with longer cables, and ultimately it appears to annoy consumers more than the pirates. At present, known hacks / workarounds to strip HDCP 2.2 from video signals can be found. | ||
| + | |||
| + | === Cable Size === | ||
Wikipedia describes HDMI as "compact," however, with 19 wires wrapped in a single cord it is actually quite heavy and stiff, being somewhat difficult to work with in "in wall" applications, and limited in transmission range. The concept is primarily for simplicity so the consumer only has one cable to connect for all video color bands as well as high definition audio. | Wikipedia describes HDMI as "compact," however, with 19 wires wrapped in a single cord it is actually quite heavy and stiff, being somewhat difficult to work with in "in wall" applications, and limited in transmission range. The concept is primarily for simplicity so the consumer only has one cable to connect for all video color bands as well as high definition audio. | ||
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DVI is an alternative to HDMI, except there lacks a single DVI standard. DVI to HDMI converters are inexpensive, but some small degree of quality is lost in the conversion process. A newer technology called HDBaseT looks to possibly replace HDMI, which will be a welcome improvement. | DVI is an alternative to HDMI, except there lacks a single DVI standard. DVI to HDMI converters are inexpensive, but some small degree of quality is lost in the conversion process. A newer technology called HDBaseT looks to possibly replace HDMI, which will be a welcome improvement. | ||
| + | |||
| + | === Cable Advancements === | ||
| + | |||
| + | The new HDMI specification for High Performance HDMI includes an over 75% increase in the bandwidth requirement, from 10.2Gbps to 18Gbps. High Speed HDMI Cables are engineered to deliver a full 18Gbps data required by the new HDMI specification. | ||
| + | |||
| + | Cables have also improved in physical flexibility. The original HDMI cables that hit the market were very stiff and difficult to work with. Quality manufactures are now producing HDMI cables that put less stress on the socket of video equipment. | ||
| + | |||
| + | === CEC === | ||
| + | |||
| + | CEC (Consumer Electronics Control) is the control protocol found in HDMI. If you've not heard of CEC, you may have heard of it in another form, Sony call it Bravialink, LG call it Simplink and Samsung call it Anynet+ . This allows HDMI devices to control each other and allows the user to operate multiple devices with one remote control handset or device interface. | ||
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| + | HDMI-CEC is a one-wire bidirectional serial bus that uses the industry-standard AV.link protocol to perform remote control functions. CEC is carried on pin 13 in the HDMI cable connector. | ||
| + | |||
| + | Media center systems XBMC and [[MythTV]] already support HDMI-CEC. The specifications have been revised since the original HDMI and some manufacturers deviate from the specs. Complete compliance is not always available. CEC wiring is mandatory, although implementation of CEC in a product is optional. | ||
| + | |||
| + | A common example of CEC use is a feature called "One Touch Play." By pressing the play button on a DVD player, a command is issued to a downstream A/V Receiver to automatically power on, switch to the active HDMI input, and similarly send the same power on and input switch commands to the HDTV. | ||
[[Category:Electronics]] | [[Category:Electronics]] | ||
Latest revision as of 14:00, 13 May 2020
HDMI is a type of Standard Video Device Connector that carries the same video signal as DVI, but instead of using the remaining pins for an optional video signal, pins are used to carry seven digital audio channels. HDMI is a method for connecting a video and audio source device such as a set-top box or DVD player to a display device using a single cable. HDMI connectors are now appearing on some computers, typically on new video cards and video capture devices.
Unlike PC VGA, HDMI is all digital. HDMI has superior video quality when compared to Component Video, S-Video, and Composit. HDMI includes the audio as well as video, unlike the aforementioned video cable types.
HDMI handles both Video and Sound. With 19 wires wrapped in a single cable, HDMI is able to carry a bandwidth of 5 Gbps (gigabits per second). This is more than twice the bandwidth needed to transmit multi-channel audio and video.
Contents
DRM
Because all HDMI devices are HDCP compliant, the HDMI advantage is overshadowed by anti-copy technology that cripples video equipment with HDMI connectors. Consumers should understand the dirty tricks being imposed by Intel, the MPAA, and manufacturers pushing for HDMI dominance.
High-bandwidth Digital Content Protection (HDCP), as mentioned above, is a technology that prevents you, the consumer, from backing up or making copies of your video media that you own. All HDMI devices have built in HDCP anti copy technology.
Dish Network and DirecTV are now using HDMI connectors with HDCP copy protection. Many new video processors support DVI, but cannot display that content to the component video output due to the HDCP anti copy system.
The goal of HDMI is:
- One cable, one connector that does high quality video and sound.
- Prevent consumers from backing up or copying satellite TV programming and DVD, Bluray, and HD-DVD video and movies.
- Force the industry to adopt bastardized technology with built-in usage restrictions.
Pioneer Electronics is one of the culprits pushing HDMI technology, and their DV59-AVi was one of the first to market with HDMI jacks.
HDMI has supported HDCP since the beginning, starting at HDCP 1.1 and reaching HDCP 2.2 with HDMI 2.0. HDCP can cause issues with longer cables, and ultimately it appears to annoy consumers more than the pirates. At present, known hacks / workarounds to strip HDCP 2.2 from video signals can be found.
Cable Size
Wikipedia describes HDMI as "compact," however, with 19 wires wrapped in a single cord it is actually quite heavy and stiff, being somewhat difficult to work with in "in wall" applications, and limited in transmission range. The concept is primarily for simplicity so the consumer only has one cable to connect for all video color bands as well as high definition audio.
Critics point out that besides putting additional stress on the female socket of video equipment, connections from A/V equipment (like a Blu-Ray Player) to audio only equipment (stereo receiver separate from TV) is more complicated. Many experts believe that audio should not be carried by the same cable.
DVI is an alternative to HDMI, except there lacks a single DVI standard. DVI to HDMI converters are inexpensive, but some small degree of quality is lost in the conversion process. A newer technology called HDBaseT looks to possibly replace HDMI, which will be a welcome improvement.
Cable Advancements
The new HDMI specification for High Performance HDMI includes an over 75% increase in the bandwidth requirement, from 10.2Gbps to 18Gbps. High Speed HDMI Cables are engineered to deliver a full 18Gbps data required by the new HDMI specification.
Cables have also improved in physical flexibility. The original HDMI cables that hit the market were very stiff and difficult to work with. Quality manufactures are now producing HDMI cables that put less stress on the socket of video equipment.
CEC
CEC (Consumer Electronics Control) is the control protocol found in HDMI. If you've not heard of CEC, you may have heard of it in another form, Sony call it Bravialink, LG call it Simplink and Samsung call it Anynet+ . This allows HDMI devices to control each other and allows the user to operate multiple devices with one remote control handset or device interface.
HDMI-CEC is a one-wire bidirectional serial bus that uses the industry-standard AV.link protocol to perform remote control functions. CEC is carried on pin 13 in the HDMI cable connector.
Media center systems XBMC and MythTV already support HDMI-CEC. The specifications have been revised since the original HDMI and some manufacturers deviate from the specs. Complete compliance is not always available. CEC wiring is mandatory, although implementation of CEC in a product is optional.
A common example of CEC use is a feature called "One Touch Play." By pressing the play button on a DVD player, a command is issued to a downstream A/V Receiver to automatically power on, switch to the active HDMI input, and similarly send the same power on and input switch commands to the HDTV.
