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Wireless HDMI is the wireless transmission of high-definition audio and video signals between devices, using unlicensed radio frequencies like 5 GHz, 60 GHz, or 190 GHz. This technology eliminates the need for an HDMI cable , allowing users to transmit signals wirelessly between the component device and the display device.
Wireless Home Digital Interface (WHDI) is a consumer electronic specification for a wireless HDTV connectivity throughout the home. WHDI enables delivery of uncompressed high-definition digital video over a wireless radio channel connecting any video source ( computers , mobile phones , Blu-ray players etc.) to any compatible display device .
Miracast is "effectively a wireless HDMI cable, copying everything from one screen to another using the H.264 codec and its own digital rights management (DRM) layer emulating the HDMI system". The Wi-Fi Alliance suggested that Miracast could also be used by a set-top box wanting to stream content to a TV or tablet.
Some wireless range extending devices connect via a USB port. These USB adapters add Wi-Fi capability to desktop PCs and other devices that have standard USB ports. USB supports not only the data transfers required for networking, but it also supplies a power source so that these adapters do not require electrical plugs.
The HDMI Alternate Mode for USB-C allows HDMI-enabled sources with a USB-C connector to directly connect to standard HDMI display devices, without requiring an adapter. [197] The standard was released in September 2016, and supports all HDMI 1.4b features such as video resolutions up to Ultra HD 30 Hz and CEC. [ 198 ]
Passive cables allow MHL devices to connect directly to MHL-enabled TVs (i.e. display devices or AV receivers with an MHL-enabled HDMI port) while providing charging power upstream to the mobile device. Other than the physical connectors, no USB or HDMI technology is being used.