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4K Resolution - Approximately 4000 pixels wide used in the HDMI 1.4a specification, which is roughly 4 times
the resolution of 1080p.
Audio Return Channel - The audio return path in HDMI 1.4a allows a TV to send audio data upstream to an A/V
receiver, eliminating the need for a separate SPDIF audio connection. It supports the same audio formats as an
SPDIF cable, which means it does not support high-definition audio or multi-channel PCM.
CEC - Consumer Electronics Control. One of the channels in an HDMI connection is dedicated to a set of
advanced control functions, collectively known as CEC. When enabled by the manufacturer, CEC functionality
allows connected devices to control each other in useful ways. For instance, a single command on a remote
control can be used to play a DVD or to launch other complex activities across multiple devices in a home
theater system.
DDC - The Display Data Channel, one of the channels in an HDMI connection. DDC allows devices to assess each
others’ capabilities and adjust themselves accordingly. For example, a DVD player can discover the maximum
resolution of the monitor it is connected to by reading the monitor’s EDID chip and optimize its signal output to
match that monitor’s display capabilities.
EDID - Extended Display Information Data, the data contained (in a small memory called EEPROM) on each DVI
display or HDMI sink. The source device checks the display’s DVI or HDMI port for the presence of an EDID PROM
and uses the information inside to optimize the output video and/or audio format. All sink devices compliant to
the HDMI specification must implement EDID.
HDCP - High-bandwidth Digital Content Protection, an authentication system developed by Intel designed to
protect copyrighted audiovisual content. Most HDMI-enabled and DVI-enabled devices employ HDCP.
Hot Plug Detect - A pin on the HDMI connector that allows the source device to sense when a display device
has been connected to it and its EDID is readable.
Source - A device that sends an HDMI signal, such as a DVD player or set-top box.
Sink - A device that receives an HDMI signal, such as an HDTV.
HDMI Repeater - A device that both receives and sends HDMI signals, such as an A/V receiver.
BCAPS Register - The source reads the sink’s BCAPS register to determine whether the downstream device it is
connected to is a display device or a repeater device.
Ro Value - Ro is a register value used to compare the source and sink and determine if the HDCP authentication
has been completed successfully.
Glossary of Terms
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