HDMI is a
connection technology capable of handling audio and video at the same time; that
is, it is not necessary to have a cable for each. In addition Techqueer to that, all
HDMI transmission is carried out through digital signals, which makes the
technology suitable for transmitting video and audio of the highest quality.
HDMI is a connection standard for audio
and video devices that has everything to replace existing standards. Behind
its development, there is a team made up of giants of the electronics industry,
such as Sony, Philips, Toshiba, and Silicon Image, among others. Using HDMI, it is possible, for example, to connect a Blu-Ray
player to a high-resolution
Television and
have excellent quality images as a result. Through Digitalknowledgetoday
an HDMI cable, it is
possible to transmit audio and Healthnutritionhints signals. For the other standards,
it
is necessary to have at least one cable for each output.
The
advantages of HDMI Smartdiethealth are not limited to that. This is a technology that
transmits signals in a fully digital form. Thanks to this, it is possible to obtain images of excellent quality and high
resolutions, which currently can reach up to 8K.
Mechanically speaking, the HDMI cable
connector is small and easy to fit, similar to USB
connectors. The industry defined two types of connectors: HDMI type A and
HDMI type B, with 19 and 29 pins, respectively. The type A connector is
the most common on the market since it manages to satisfy all the existing
demands, being even compatible with DVI-D technology. In this case, Healthfitnesschampion just
one end of the cable is DVI-D, and the other is HDMI. The HDMI type B connector is intended for higher resolutions and
can work with the dual-link scheme, which doubles the pixel clock
frequency,
making the transmission double its capacity.
How HDMI works
HDMI
technology makes use of a protocol called Transition Minimized
Differential Signaling (TMDS). In the case of HDMI, three
TMDS channels are used for the transmission of audio and video information. The
devices that initiate the transmission are called “Sources.” On the other hand, the
devices that receive the transmission signal are called “Links.”
TMDS technology plays an
extremely important role in HDMI transmission because even if the signal is
digital, it does not mean that it is free from glitches and interference. With
TMDS channels, data transmission can be done in an encrypted manner, making it
protected. This is possible because the TMDS channel uses
a cancellation scheme. In it, the signal is doubled;
however, the second signal is inverted. The receiving device receives both
signals and compares them. The differences found in this comparison make
it possible to identify undue alterations, that is, transmission noises, and
rule them out.
When the transmission starts, the three TMDS channels are used
for sending video data, the so-called Video Data Period. Each channel
sends 8 bits at a time, up to 24 bits. This is done at a frequency called
pixel clock that varies between 25 MHz and 165 MHz. In the case of
transmissions that do not reach 25 MHz, as in PAL and NTSC signals, it is done
by using a repetition technique. Of pixels. With this type of operation,
HDMI can transmit more than 165 million pixels.
