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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.
The HDMI alternate mode lets a user connect the reversible USB-C connector with the HDMI source devices (mobile, tablet, laptop). This cable connects to video display/sink devices using any of the native HDMI connectors. This is an HDMI cable, in this case a USB-C to HDMI cable. [72]
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.
Microsoft launched a Surface HD Digital A/V Adapter which works with micro-HDMI to HDMI for the Surface and Surface 2, and a Surface VGA adapter which also works with Surface and Surface 2 going from the built-in micro-HDMI to VGA. For the Surface Pro series, a Display Port to HD A/V (HDMI) and a Display Port to VGA adapter was created.
The use of passive cables is possible when both devices support the standard, e.g., when connecting to superMHL, USB Type-C, and MHL-enabled HDMI, otherwise, an active cable adapter is necessary to connect to standard HDMI devices. [24]
Display Data Channel (DDC) is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast.
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