The HDMI connector looks a lot like a full-size USB port, only larger and having a trapezium shape. HDMI 2.1 also introduces the Ultra High-Speed HDMI cable category to comply with the high-speed bitrate. The latest version also includes Dynamic HDR for specifying HDR metadata, Variable Refresh Rate (VRR), and ARC was updated to eARC (Enhanced Audio Return Channel) for audio formats such as Dolby Atmos and DTS:X. All of this was possible thanks to the doubling of the bandwidth and the addition of a fourth data-rate channel that meant a total of 48Gbps bitrate. This can achieve 4K resolution at 120Hz and can even push up to 8K and 10K resolutions at 30Hz or higher using Display Stream Compressions. All new high-end televisions, gaming consoles, and graphics cards are now being shipped with HDMI 2.1. The most recent version, HDMI 2.1, was announced by the HDMI Forum in 2017. Like 1.2, this one also saw a mid-cycle update with version 1.3a, which again had similar CEC updates and some modifications to the smaller type-c connector. HDMI 1.3 also introduced a new Type-C Mini HDMI connector (more on that later). This version also had support for increased color spaces and optional support for Dolby TrueHD and DTS-HD Master Audio. It also added support for 10-bit, 12-bit, and even 16-bit color depth, depending on the resolution. Additionally, it also added support for 4K or 2160p at 30Hz, although it wasn’t made official until the release of HDMI 1.4. First of all, it finally doubled the bandwidth to 10.2Gbps, which bumped up the ability to deliver 720p resolution at 240Hz, 1080p at 120Hz, and 1440p 60Hz. This was a big leap for the standard when it launched in June 2006. In 2005 itself, HDMI 1.2a was announced, which added compliance for Consumer Electronics Control (CEC), allowing multiple HDMI devices to control each other with one remote controller. This version was originally intended to derestrict formats to increase compatibility and compete with the new and emerging Display Port interface. It also added support for some newer color spaces. Arriving almost a year after HDMI 1.1, HDMI 1.2 was an important update as it included compatibility for low voltage devices, making it suitable for PCs (especially graphics cards).
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