page_title: HDMI
section_title: Version 1.4
hierarchical_section_title: HDMI / Versions / Version 1.4
caption_attribution_description: English: Audio Return Channel (ARC) allows audio to pass "the opposite way" through an HDMI 1.4-cable. This can eliminate the need for a second audio cable I.E. if you want to pass TV-audio through a receiver.
context_page_description: HDMI is a proprietary audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device, such as a display controller, to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI is a digital replacement for analog video standards.
  HDMI implements the EIA/CEA-861 standards, which define video formats and waveforms, transport of compressed and uncompressed LPCM audio, auxiliary data, and implementations of the VESA EDID. CEA-861 signals carried by HDMI are electrically compatible with the CEA-861 signals used by the Digital Visual Interface. No signal conversion is necessary, nor is there a loss of video quality when a DVI-to-HDMI adapter is used. The CEC capability allows HDMI devices to control each other when necessary and allows the user to operate multiple devices with one handheld remote control device.
  Several versions of HDMI have been developed and deployed since the initial release of the technology, but all use the same cable and connector.
context_section_description: HDMI 1.4 was released on June 5, 2009, and first came to market after Q2 of 2009. Retaining the bandwidth of the previous version, HDMI 1.4 added support for 4096 × 2160 at 24 Hz, 3840 × 2160 at 24, 25, and 30 Hz, and 1920 × 1080 at 120 Hz. It also added an HDMI Ethernet Channel (HEC) that accommodates a 100 Mbit/s Ethernet connection between the two HDMI connected devices so they can share an Internet connection, introduced an audio return channel (ARC), 3D Over HDMI, a new Micro HDMI Connector, an expanded set of color spaces with the addition of sYCC601, Adobe RGB and Adobe YCC601, and an Automotive Connection System. HDMI 1.4 defined several stereoscopic 3D formats including field alternative (interlaced), frame packing (a full resolution top-bottom format), line alternative full, side-by-side half, side-by-side full, 2D + depth, and 2D + depth + graphics + graphics depth (WOWvx). HDMI 1.4 requires that 3D displays implement the frame packing 3D format at either 720p50 and 1080p24 or 720p60 and 1080p24. High Speed HDMI cables as defined in HDMI 1.3 work with all HDMI 1.4 features except for the HDMI Ethernet Channel, which requires the new High Speed HDMI Cable with Ethernet defined in HDMI 1.4.
  HDMI 1.4a was released on March 4, 2010, and added two mandatory 3D formats for broadcast content, which was deferred with HDMI 1.4 pending the direction of the 3D broadcast market. HDMI 1.4a has defined mandatory 3D formats for broadcast, game, and movie content. HDMI 1.4a requires that 3D displays implement the frame packing 3D format at either 720p50 and 1080p24 or 720p60 and 1080p24, side-by-side horizontal at either 1080i50 or 1080i60, and top-and-bottom at either 720p50 and 1080p24 or 720p60 and 1080p24.
  HDMI 1.4b was released on October 11, 2011, containing only minor clarifications to the 1.4a document. HDMI 1.4b is the last version of the standard that HDMI Licensing, LLC is responsible for. All future versions of the HDMI Specification were produced by the HDMI Forum, created on October 25, 2011.
caption: HDMI 1.4 with audio return channel
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