dateline= писал(а):[edit] TMDS
Main article: Transition Minimized Differential Signaling
Transition Minimized Differential Signaling (TMDS) on HDMI carries video, audio, and auxiliary data via one of three modes, called the Video Data Period, the Data Island Period, and the Control Period.[71] During the Video Data Period, the pixels of an active video line are transmitted.[71] During the Data Island period (which occurs during the horizontal and vertical blanking intervals), audio and auxiliary data are transmitted within a series of packets.[71] The Control Period occurs between Video and Data Island periods.[71]

Both HDMI and DVI use TMDS to send 10-bit characters that are encoded using 8b/10b encoding for the Video Data Period and 2b/10b encoding for the Control Period. HDMI adds the ability to send audio/auxiliary data using 4b/10b encoding for the Data Island Period.[71] Each Data Island Period is 32 pixels in size and contains a 32-bit Packet Header, which includes 8 bits of BCH ECC parity data for error correction and describes the contents of the packet.[72] Each Packet contains four subpackets, and each subpacket is 64 bits in size, including 8 bits of BCH ECC parity data, allowing for each Packet to carry up to 224 bits of audio data.[73] Each Data Island Period can contain up to 18 Packets.[74] Seven of the 15 Packet types described in the HDMI 1.3a specifications deal with audio data, while the other 8 types deal with auxiliary data.[72] Among these are the General Control Packet and the Gamut Metadata Packet. The General Control Packet carries information on AVMUTE (which mutes the audio during changes that may cause audio noise) and Color Depth (which sends the bit depth of the current video stream and is required for Deep Color).[75][76] The Gamut Metadata Packet carries information on the color space being used for the current video stream and is required for xvYCC.[42][77][78]