Cable guide: HDMI


There are many monitors and graphics cards that have HDMI connections. HDMI is essentially the same signal as single-link version of DVI-D and originally had the same resolution. However, there is a big difference between the two interfaces: the sound. While DVI-D is a clean video signal is HDMI a combined video and audio signals. At a transition between DVI-D and HDMI disappears thus the ability to send audio. There are exceptions to this rule as some graphics card manufacturers have chosen to send audio from DVI connectors, but this does not follow the DVI standard.

HDMI is available in several different versions (eg. HDMI 1.3, HDMI 1.4 and HDMI 2.0). Version 1.3 was launched in 2006 and is regarded today as the basic version of HDMI. It was in connection with the release of HDMI 1.3 that HDMI and DVI-D began to go their separate ways. DVI-D Single Link and older versions of HDMI can transfer up to 4.95 Gb / s, which was sufficient for 1920 x 1080 at 60 Hz. HDMI 1.3 doubled the data bandwidth of 10.2 Gb / s to enable the same solution at up to 120 Hz.

Version 1.4 was released in 2009 and introduced the ability to transfer video material in Ultra HD 4k resolution (3840 x 2160), ie four times higher resolution than Full HD. This was not revolutionary in itself, since the four-times higher solution was made possible by the refresh rate was limited to one quarter (i.e. overall an equal number of data). HDMI 1.4 enabled thereby either Full HD resolution at 120 Hz or Ultra HD 4k resolution at 30 Hz. 30 Hz is too low refresh rate for use in computer monitors, but it is adequate for film.

HDMI 2.0 was released in 2013 and is the latest version of HDMI. The increased bandwidth further to 18 Gb / s (from 10.2 Gb / s), and could therefore improve the refresh rate for Ultra HD 4k dissolved video signal. With HDMI 2.0, it is possible to transfer Ultra HD 4k signal at 60 Hz, which allows the HDMI interface suitable even for high-resolution computer screens.


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