HD MI interface versions, HDMI Introduction
Keywords: H D M I interface version introduction
H d M i interface version introduction
1. Version situation
HDMI interface standards have been found so far: 1.0 / 1.1 / 1.2 / 1.2A / 1.3 / 1.3A / 1.3B. HDMI1.0 released in February 2002 released: 2004
May released version 1.1; August 2005 released version 1.2: Release 1.2A version of the same year: 1.3 version is released in June 2006. The latest version of HDMI is HDMI1.3B.
From HDMI1.1 to HDMI1.3, less than 4 years, and 1.2, almost no extensive application is replaced by version 1.3. At present, the HDHI interface 1.1 version is mainly the middle and low-end machines of foreign brands, and some domestic low-end machines, 1.2 editions have been rare, and the 1.3 version of the HDMI interface has begun.
2. Video transmission performance
There are two main issues of the HDMI1.1 version:
First, only 1 080i signal is supported, not supported by 1,080p, but can support 1080P has become a hot spot for purchasing flat-panel TV users. In fact, the 1.1 version of the interface also supports 1080P in some cases, but it is necessary to set up the manufacturer's setting and development, and cannot guarantee that each 1.1 interface can be supported.
Second, the computer signal is poor, only basic formats such as 800 × 600, 1024 × 768. For the format of 1366 × 768, it cannot be compatible, so it is not possible to point to point display. Since the LCD TV and large screen plasma are still mainly based on 1 366 × 768, it is not possible to display computer signals correctly. Since the flat-panel TV has been connected to the HTPC computer, it is used to watch the network movie, so this problem is It is very prominent.
The main goal of the 1.2 version is to solve the tv's 1080p and computer point-to-point display problem 1.2-polar clock running frequency reaches 165HHz, and the amount of data reaches 4.95 Gbps, and the data transfer rate is improved, and 1080p is naturally possible. At the same time, it also solves the compatibility problem of various computers display resolution formats, and point-to-point display can be implemented.
1.3 The main solutions of the version have nothing to do with 1080p and computer compatibility, but to multimedia expansion:
It uses new ITDMS transmission technology, and the transmission efficiency is doubled, and single bandwidth is increased from 1 65 MHz (4.95 Gbps) to 340 HHz (1 0.2 Gbps). And add support for dark technology, providing a wide color space and support for automatic audio / video synchronization (lip synchronization), and provides a smaller interface for personal photo and photographic devices.
3. Audio transmission performance
HDMI1.1: Transfer LPCM 7.1, Dolby Digital, DTS signal, can convert DVD-AUDIO audio stream to LPCM output.
HDMI1.2: Increase the SACD DSD audio stream, is the popular 1 bit audio.
HDMI1.3: Added Dolby Digital-Ture. HD and DTS-HD support.
4. HDMI interface and 1080p relationship
The above mentioned HDHI interface seems to be only 1.2, can support 1,080p, which is actually not entirely, and the HD TV signal itself includes 1080i and 1080P, and for flat-panel TVs, even if it is 1080i signal, The television itself also has a "deinterlaxy circuit", which can process the interlaced signal as a progressive signal, otherwise the flat-panel television cannot display the image. Since the display mode of the flat-panel TV is not a scanning method of the CRT, it is "address display mode", which is about to display the signals of each memory cell on the memory, read out at a very fast speed (substantially simultaneously) displayed on the respective pixels of the screen. Therefore, it is considered that the flat-panel TV display is "progressive". It relies on the internal "delative circuit" to store the two game 1080i signals, and then sequentially read the "progressive" signal display.
Therefore, for watching 1080p HD programs, the HDMLL.3 version is not the main upgrade purpose. That is, the 1.3 version of the interface is solved is computer compatibility issues and multimedia extensions.
When the player directly outputs a 1080p signal directly from the 1.3 version of the interface to a flat-panel TV with a version 1.3 version, you do not need to do progressive processing. In fact, in addition to some low-end, most flat-screen TVs support 1080p input, and above has been introduced, and under the HDMI interface, 1080i and 1080p have no qualitative difference. Therefore, for users who use high-definition TVs, there is no need to consider the version of HDMI. Read more
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