Background:
As the HDTV market continues to heat up, consumers are required, formed on the cutting edge of technology. One of the terms that you, the consumer is safe to run during the selection of a set HDTV: HDMI. For the most part it is an unknown concept, and explain the details of HDMI in this article, so that you, the consumer is armed with the right knowledge to make intelligent purchasing decisions.
Hdmi
What is HDMI: HDMI stands for High Definition Multi-MediaInterface. The HDMI specification (now 1.2) was created by some of the largest manufacturers of consumer electronics in the world: Hitachi, Matsushita, Philips, Silicon Image, Sony, Thomson and Toshiba. HDMI is the new standard for HDTV digital interconnect. The large difference between HDMI and the earlier HDTV interconnects standards (component video and DVI) are:
HDMI is all digital unlike analog component video cable
HDMI supports multi-channel audio in addition todigital video. (DVI only supports digital video)
- HDMI is compact and has eliminated both audio and video signals, and clutter.
Integrated HDMI content protection called HDCP (High Definition Content Protection)
What does a HDMI connector type: HDMI is similar to a USB cable. The compact size and high integration (carries both audio and video) makes the HDTV installation experience truly "plug and play".
Why should IHDMI:
HDMI is a digital, so picture quality is "perfect" from source to screen
HDMI is a digital audio and video connections. This minimizes system wiring
HDMI is rapidly becoming the de facto standard for HDTV connections.
How does HDMI transport the digital video: The video is part of the HDMI performed by 3 separate differential pairs. Each pair transports 1 of 3 uncompressed native digital R, G, B signals from the source (DVD player, set-top box)the sink (HDTV display). A single protocol TMDS (transmission minimized differential signaling), is used for the transport of digital data. Each pixel is represented by 24 bits (8 bits each for each primary color). The TMDS protocol then "calculates" and food for 2 bit more for the video stream to a digital data stream to create the minimum transitions (lower EMI, lower interference) and also minimize long strings of '1 ' and '0', which may cause detection errors.
Afourth differential pair, called the TMDS clock provides the pixel clock for timing the data stream. The maximum TMDS single link pixel clock rate is 165 MHz.
What is the data rate of a single link HDMI connection: The maximum pixel clock is 165MHz and each of the 3 TMDS video streams carries 10 bits. Therefore, the aggregated data is 3 x 10 x 165MHz = 4.96Gbps.
How many pins are included in the HDMI connector: There are 19 individual pins in HDMI port. There are 3Pairs of TMDS signals to carry all digital audio and video signals.
Since the digital audio signal is delivered: the multi-channel audio is the time in the TMDS data streams combined. The audio is much lower data rate (192 kbps) and the extra time is used to demux the audio signals.
What is HDCP: HDCP stands for High-Bandwidth Digital Content Protection. HDCP is an encryption method developed by Intel in order to control unauthorized copying of digital media. L 'Encryption is found success in the HDMI transmitter in "source" (DVD player, set-top box) and decryption is done by the receiver HDMI (HDTV) is performed. The secret keys for encryption are exchanged between the source and display over an I2C bus (pins 15 and 16).
It is compatible with HDMI-DVI: DVI is the predecessor to HDMI. HDMI and DVI are identical as regards the video goes. Therefore, there is video compatibility. However, DVI does not support digital audio.For example, if you have an older DVI connection on the source and an HDMI port on the display, a DVI-HDMI cable all you need to watch this video. A separate audio cable (TOSLINK or SPDIF) are needed, which will bring digital audio.
What formats are supported HDMI: HDMI is a high-speed digital connection and resolutions of 480i, 480p, 720i, 720p, 1080i and in the future, support 1080p.
Conclusion:
HDTV technology is changing rapidly. HD connectionssuch as HDMI will become the de facto standard in HDTV connections. We have outlined the main features of HDMI, so that consumers are well informed and prepared to make smart choices.
HDMI: Guide to HDTV Connection of the Future
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