HDMI is the abbreviation of (High DefiniTIon MulTImedia Interface), which means high-definition multimedia interface. It is a digital video/audio interface technology. It is a dedicated digital interface suitable for image transmission. It can transmit audio and video signals at the same time. The highest data transmission speed. It is 48Gbps (version 2.1).
There is no need to perform digital/analog or analog/digital conversion before signal transmission. HDMI can be paired with Wideband Digital Content Protection (HDCP) to prevent unauthorized copying of copyrighted audio and video content.
The extra space available for HDMI can be applied to audio and video formats that will be upgraded in the future.
And because a 1080p video and an 8-channel audio signal require less than 0.5GB/s, HDMI has a lot of headroom. This allows it to be connected to a DVD player, receiver and PRR with a single cable.
The DVI interface was developed in September 1998 by the Digital Display Working Group (DDWG), which was established at the Intel Developer Forum. It has invented a technology for high-speed transmission of digital signals, including DVI-A, DVI-D and DVI. -I three different interface forms. DVI-D only has a digital interface, DVI-I has digital and analog interfaces, and the current application is mainly DVI-I (24+5).
For the application research of DVI interface on digital TV and flat panel TV, more important is the implementation of EDID (Extended Display IdenTIficaTIon DATA) programming and HDCP (High-bandwidth Digital Content Protection) function. These are new applications for digital TV. Only when EDID and HDCP are implemented on digital TV, the DVI interface is the real digital TV interface. There are also separate broadcasts, how to use the correct method to test the video signal outputted by the DVI interface for accurate broadcast-level indicators. There is currently no perfect method.
Question 1, what is the relationship between HDMI and DVI, can they really be converted between them?
HDMI (High-Definition Multimedia Interface), also known as High-Definition Multimedia Interface, is the first all-digital high-definition, multi-channel audio and intelligent format and control command data that supports transmission over a single cable without compression. Digital interface. The HDMI interface was promoted by Silicon Image USA and jointly developed by a working group jointly established by eight famous consumer electronics manufacturers such as Sony, Hitachi, Panasonic, Philips, Thomson and Toshiba. HDMI's earliest interface specification, HDMI 1.0, was released in December 2002. The current highest version is the HDMI 1.3 specification released in June this year.
The HDMI interface typically provides up to 5 Gbps of data transmission bandwidth and delivers uncompressed audio and high resolution video signals. An important feature of HDMI is that it only needs one HDMI cable to complete the simultaneous transmission of video and audio signals, eliminating the need for multiple wires to achieve higher audio and video transmission quality. At the same time, because it does not need to perform digital/analog or analog/digital conversion before signal transmission, the transmission quality of video and audio is effectively guaranteed.
HDMI is derived from DVI interface technology. They are mainly based on the TMDS signal transmission technology of American Crystal Image Company. This is the reason why the HDMI interface and DVI interface can be converted to each other through the adapter. It is compatible with DVI on the pin, but only Different packages are used. Compared to DVI, HDMI can transmit digital audio signals and add support for HDCP while providing better DDC options. In principle, HDMI is fully backward compatible with DVI.
Question 2: Will the quality of playback be affected by using DVI to HDMI cable?
Strictly speaking, the quality of playback will not be lost, because they do not need to be converted at all! In terms of technical specifications, HDMI to DVI is backward compatible. All DVI specifications, HDMI can "do things according to the rules", so DVI to HDMI theory will not appear any grayscale distortion problem!
For today's DVI displays, displays that meet the HDMI 1.3 specification interface requirements have long been popular, and only a handful of displays that still use the 1.0 specification are likely to have so-called grayscale distortion. At this time, we only need to adjust the player settings. Take Kmplayer as an example. If there is gray distortion such as black distortion and white scattering, just open the “Fuzzy/Levels†option in the parameter options to enable the color scale. The control option can be solved by selecting 16-236 instead of the default 0-255 at the output amplitude position.
Some users may ask, for computer users, if you directly integrate an HDMI interface on the graphics card, it is not good, and it saves you from having to turn around. In fact, most mainstream manufacturers do not integrate the HDMI interface on their own graphics cards is well thought out, the main reason is to have two points:
1, DVI interface display is still the mainstream of the market. As the saying goes, it is difficult for a clever woman to be without rice. The interface used by the liquid crystal display that can be seen on the market is almost all DVI interface, and it is difficult to directly connect the HDMI interface with another HDMI interface. Moreover, if the user is using a native HDMI graphics card, then after connecting it to the DVI display, there will be a possibility that black and white, white full to unrecognizable, etc., the user must adjust the brightness of the display to solve, but in the case In a normal scenario, this may cause the brightness of the scene to be too low to be viewed, and the user may need to constantly adjust the brightness. For this reason, before the large-scale display of the HDMI interface, most manufacturers have adopted a very cautious attitude toward the direct integration of the HDMI interface into the graphics card in order to ensure the quality of the HD video.
2. Give users more choices. If the user chooses a native HDMI graphics card, then his device has almost no choice, only the display with HDMI interface, and now only a few manufacturers such as BenQ on the market have introduced LCD with HDMI interface. And the price is not high. Therefore, the graphics card using the native HDMI interface virtually increases the user's purchase cost and becomes a "forced" user in disguise.
Question 3, DVI to HDMI adapter cable price will not be very expensive?
Now the DVI to HDMI adapter cable sold on the market, the price is between 10-30 yuan, the price is not very high, it is recommended that users choose a mid-range product of 15-20 yuan, the price is right, the playback effect is also guaranteed.
Question 4, I want to use the computer to watch HD, now which graphics cards support the output and playback of HDMI images, what is the price?
Most mainstream graphics cards now support the output and playback of HDMI images. Considering that when playing HDMI video, the CPU is very loaded. Users are advised to use a graphics card with hard decoding. If you do not have too high a demand for the graphics card's game speed, we recommend you to use the Onda 2400Pro HD silent version of the graphics card with a market price of only 399 yuan. This graphics card is solid, with high-quality plates, with 256M memory, using 2.5ns of memory, the factory default frequency of the core and graphics card is 600/800MHZ, is the only HD mute graphics card running at this frequency on the market. . In terms of technical specifications, the core of the Onda HD2400pro is the ATI R610, which uses 65mm process technology, which greatly reduces the power consumption and temperature of the graphics card itself. The core integrates 180 million transistors with 40 stream processors, 4 texture units and 4 rasterizers. Support HDMI, support H.264 and VC-1 hardware video decoding, support HD AVIVO, built-in 5.1 channel digital sound card. Fully compliant with HD movie playback standards.
Recommended reading: Can the DVI interface be transferred to the VGA interface? How to convert DVI interface to VGA interface?
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