2002年4月，日立、松下、飛利浦、索尼、湯姆遜、東芝和Silicon Image七家公司聯(lián)合組成HDMI組織。在中國，兆龍，秋葉原，綠聯(lián)科技，北棋科技等是HDMI標(biāo)準(zhǔn)的推崇者和技術(shù)的者。HDMI能高品質(zhì)地傳輸未經(jīng)壓縮的高清視頻和多聲道音頻數(shù)據(jù)，數(shù)據(jù)傳輸速度為5Gbps。同時(shí)無需在信號(hào)傳送前進(jìn)行數(shù)/模或者模/數(shù)轉(zhuǎn)換，可以保證質(zhì)量的影音信號(hào)傳送。

　HDMI Type A socket. 　　HDMI的規(guī)格書中規(guī)定了三種HDMI接頭, 分別是: 　　
  HDMI腳位配置

 
HDMI AType

 Pin定義
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 CEC
14 Reserved (N.C. on device)
15 SCL
16 SDA
17 DDC/CEC Ground
18 +5V Power
19 Hot Plug Detect
HDMI B Type

　　總共有29pin, 可傳輸HDMI A type兩倍的TMDS資料量, 相對(duì)等于DVI Dual-Link傳輸, 用于傳輸高分辨率(WQXGA 2560x1600以上)。 (因?yàn)镠DMI A type 只有Single-Link的TMDS傳輸, 如果要傳輸成HDMI B type的訊號(hào), 則必須要兩倍的傳輸效率, 會(huì)造成TMDS的Tx、Rx的工作頻率必須提高至270MHz以上。 而在HDMI 1.3 IC出現(xiàn)之前, 市面上大部分的TMDS Tx、Rx只能穩(wěn)定在165MHz以下工作。) 　　
Pin Pin定義
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 TMDS Data5+
14 TMDS Data5 Shield
15 TMDS Data5-
16 TMDS Data4+
17 TMDS Data4 Shield
18 TMDS Data4-
19 TMDS Data3+
20 TMDS Data3 Shield
21 TMDS Data3-
22 CEC
23 Reserved (N.C. on device)
24 Reserved (N.C. on device)
25 SCL
26 SDA
27 DDC/CEC Ground
28 +5V Power
29 Hot Plug Detect
HDMI C Type

　　總共有19pin, 可以說是縮小版的HDMI A type, 但腳位定義有所改變。 主要是用在便攜式裝置上, 例如DV、數(shù)碼相機(jī)、便攜式多媒體播放機(jī)等。 現(xiàn)在已有SONY HDR-DR5E DV利用此規(guī)格接頭作為影像輸出接口。(常常有人稱為該規(guī)格為mini-HDMI, 這可算是自行胡亂創(chuàng)造的名稱, 實(shí)際上HDMI并沒此名稱。)
HDMI D Type

HDMI Type D，俗稱Micro HDMI 是定義為HDMI 1.4版本的，保持hdmi標(biāo)準(zhǔn)的19pin .但是尺寸與微型USB的接口差不多，尺寸為2.8 mm × 6.4 mm,比mini hdmi (2.42 mm × 10.42 mm)小很多，主要應(yīng)用在一些小型的移動(dòng)設(shè)備上，如手機(jī)，MP4等等。 　　對(duì)于手機(jī)的廠家來說，不管怎么努力，手機(jī)的屏幕還是太小，要想更多人看清，將視頻輸出到外部顯示設(shè)備無疑是必須的，在XT800之前，已有數(shù)款機(jī)型支持AV模擬輸出，通過特制3.5mm轉(zhuǎn)接線來實(shí)現(xiàn)CVBS復(fù)合信號(hào)+立體聲音頻，不過這一接口的局限就是清晰度超低，320x240的分辨率使得這種輸出于比較簡(jiǎn)單的應(yīng)用，況且轉(zhuǎn)接線的體積都不小，使用并不方便。 　　眼看HDMI接口電視、投影機(jī)、顯示器越來越多，采用HDMi接口已經(jīng)成為大勢(shì)所趨，標(biāo)準(zhǔn)HDMI接口分為AB兩種類型，不過我們常見的都是A型口，B型口由于是雙通道超寬結(jié)構(gòu)基本上見不到廠家使用，標(biāo)準(zhǔn)A型口大約15mm寬，這對(duì)于家電產(chǎn)品自然不在話下，但在數(shù)碼產(chǎn)品上使用顯然占地方太大了，于是乎DV和DC產(chǎn)品普遍出現(xiàn)了HDMIC型口，也就是MiniHDMI接口。 　　不過對(duì)于手機(jī)而言，C型口依然有點(diǎn)大，于是D型口就應(yīng)運(yùn)而生，由于發(fā)布時(shí)間較短，到現(xiàn)在也不過半年時(shí)間，接口太小，對(duì)于高頻率視頻信號(hào)的傳輸、防靜電要求等都比A型口要困難的多，XT800是我們首先有機(jī)會(huì)了解到的HDMID型口應(yīng)用設(shè)備，而轉(zhuǎn)接線就比較難找，筆者經(jīng)多方面尋找，終于在淘寶上找到了一根綠聯(lián)科技的D型口轉(zhuǎn)A型口線材，有了它，連接電視、顯示器、投影機(jī)都不再是難事。 　　一端為標(biāo)準(zhǔn)的HDMI插頭，一端為Micro HDMI(D type)手機(jī)，目前部份手機(jī)有此接口。如：Motorola XT800,Nokia N8 and HTC EVO 4G 。 　　
Pin Pin定義
1 TMDS Data2 Shield
2 TMDS Data2+
3 TMDS Data2–
4 TMDS Data1 Shield
5 TMDS Data1+
6 TMDS Data1–
7 TMDS Data0 Shield
8 TMDS Data0+
9 TMDS Data0–
10 TMDS Clock Shield
11 TMDS Clock+
12 TMDS Clock–
13 DDC/CEC Ground
14 CEC
15 SCL
16 SDA
17 Reserved (N.C. on device)
18 +5V Power
19 Hot Plug Detect

　英文定義： 　　 Digital interface defined around DVI 1.0 that transmits video and audio on the same physical channel. 　　 Interface defined for use in the consumer market space. 　　zRequires separate licensing from that of DDWG’s DVI. 　　zAllows DVI/HDMI products to be sold in consumer products 　　 Supports the use of HDCP copy protection. 　　 Utilizes VESA’s Display Data Channel to read E-EDID from a display. 　　 Defines a different connector from that used on DVI. 　　 Supports optional CEC (Consumer Electronics Control), which allows high level control of all A/V products in a user environment. 　　DVI 1.0: The Physical Interface 　　 Digital Visual Interface (DVI) was developed by a group called the Digital Display Working Group or DDWG for the PC market. 　　 The interface is a high speed digital serial interface based on Transition Minimized Differential Signaling or TMDS. 　　zSource synchronous architecture. Uses a separate channel to transmit the clock. 　　zUsed to provide variable data rates to handle the various VESA supported display resolutions. 　　 A complete connection from the source to the sink devices uses three data channels (RGB/YCbCr) and a clock. 　　HDMI = DVI + Audio 　　 Using the DVI physical link to transmit video/graphics 　　 Audio is added as a logical layer to the DVI phy. 　　zDigital audio processed into packets of data 　　zThese packets are scheduled for transmission during existing horizontal and vertical blanking times within a frame. 　　 In addition, HDMI implements a packet called an infoFrame. 　　zInfoFramesare structures defined in the EIA-861B specification 　　zEIA-861B is spec for DTV and uncompressed high speed digital interfaces. 　　What is HDMI Data? 　　 There are three categories of data that is transmitted via an HDMI link. 　　zVideo Data –Video pixel data (8b data encoded to 10b), and Guard Bands (fixed 10b pattern) 　　zData Islａnd –Packet data, which can be either audio samples or Infoframes(TERC4 encoded, 4b encoded to 10b) as well as its own Guard Bａnd (fixed 10b pattern). 　　zControl –Control period coding, in which we find HSYNC, VSYNC (2b to 10b encoding) and a Preamble (used to determine whether subsequent data is video or data island) 　　Transmission of Video/Graphics 　　 HDMI transmits 24bit pixel data via three separate channels. 　　 Pixel rates supported are 25MHz to 165MHz. 　　zThis is exactly the same as single link DVI 1.0 　　 Also supports video rates below 25MHz e.g. 13.5MHz for 480i NTSC signals. 　　zAchieves this through a “pixel-repetition”scheme. 　　 Can handle pixel data in RGB, YCbCr(4-4-4), YCbCr(4-2-2) formats. 　　zIn all cases 24 bits of data per pixel clock are transmitted. 　　Transmission of Audio 　　 Basic Audio is provided via an IEC60958 audio stream at 33kHz, 44.1kHz, or 48kHz. 　　zAccommodates any normal stereo audio stream. 　　 Optionally this stream can be sent as a single channel at 192kHz. 　　 Can support IEC61937 compressed formats as found in surround-sound, Dolby Digital, etc. at rates up to 192kHz. 　　Infoframes and HDMI 　　 EIA/CEA-861B specifies a special packet called an infoframe 　　 HDMI sources and sinks are expected to use two basic infoframes. 　　zAVI (Auxiliary Video Information) Infoframe 　　 Communicates Colorimetry, Picture aspect ratio, Pixel-Repetition factor, RGB or YCbCrindicator, and others specified within 861B standard. 　　zAudio Infoframe 　　 Communicates, Channel count, Coding Type, Sample size, Sample frequency, Channel allocation and other audio specific information. 　　 There are other types of infoframes that are supported by the 861B standard, but are optional with respect to HDMI specification 　HDMI Type A socket.

　　HDMI的規(guī)格書中規(guī)定了三種HDMI接頭, 分別是:

HDMI腳位配置
HDMI AType

 Pin定義
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 CEC
14 Reserved (N.C. on device)
15 SCL
16 SDA
17 DDC/CEC Ground
18 +5V Power
19 Hot Plug Detect
HDMI B Type

　　總共有29pin, 可傳輸HDMI A type兩倍的TMDS資料量, 相對(duì)等于DVI Dual-Link傳輸, 用于傳輸高分辨率(WQXGA 2560x1600以上)。 (因?yàn)镠DMI A type 只有Single-Link的TMDS傳輸, 如果要傳輸成HDMI B type的訊號(hào), 則必須要兩倍的傳輸效率, 會(huì)造成TMDS的Tx、Rx的工作頻率必須提高至270MHz以上。 而在HDMI 1.3 IC出現(xiàn)之前, 市面上大部分的TMDS Tx、Rx只能穩(wěn)定在165MHz以下工作。)

Pin Pin定義
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 TMDS Data5+
14 TMDS Data5 Shield
15 TMDS Data5-
16 TMDS Data4+
17 TMDS Data4 Shield
18 TMDS Data4-
19 TMDS Data3+
20 TMDS Data3 Shield
21 TMDS Data3-
22 CEC
23 Reserved (N.C. on device)
24 Reserved (N.C. on device)
25 SCL
26 SDA
27 DDC/CEC Ground
28 +5V Power
29 Hot Plug Detect
HDMI C Type

　　總共有19pin, 可以說是縮小版的HDMI A type, 但腳位定義有所改變。 主要是用在便攜式裝置上, 例如DV、數(shù)碼相機(jī)、便攜式多媒體播放機(jī)等。 現(xiàn)在已有SONY HDR-DR5E DV利用此規(guī)格接頭作為影像輸出接口。(常常有人稱為該規(guī)格為mini-HDMI, 這可算是自行胡亂創(chuàng)造的名稱, 實(shí)際上HDMI并沒此名稱。)
HDMI D Type

HDMI Type D，俗稱Micro HDMI 是定義為HDMI 1.4版本的，保持hdmi標(biāo)準(zhǔn)的19pin .但是尺寸與微型USB的接口差不多，尺寸為2.8 mm × 6.4 mm,比mini hdmi (2.42 mm × 10.42 mm)小很多，主要應(yīng)用在一些小型的移動(dòng)設(shè)備上，如手機(jī)，MP4等等。

　　對(duì)于手機(jī)的廠家來說，不管怎么努力，手機(jī)的屏幕還是太小，要想更多人看清，將視頻輸出到外部顯示設(shè)備無疑是必須的，在XT800之前，已有數(shù)款機(jī)型支持AV模擬輸出，通過特制3.5mm轉(zhuǎn)接線來實(shí)現(xiàn)CVBS復(fù)合信號(hào)+立體聲音頻，不過這一接口的局限就是清晰度超低，320x240的分辨率使得這種輸出于比較簡(jiǎn)單的應(yīng)用，況且轉(zhuǎn)接線的體積都不小，使用并不方便。

　　眼看HDMI接口電視、投影機(jī)、顯示器越來越多，采用HDMi接口已經(jīng)成為大勢(shì)所趨，標(biāo)準(zhǔn)HDMI接口分為AB兩種類型，不過我們常見的都是A型口，B型口由于是雙通道超寬結(jié)構(gòu)基本上見不到廠家使用，標(biāo)準(zhǔn)A型口大約15mm寬，這對(duì)于家電產(chǎn)品自然不在話下，但在數(shù)碼產(chǎn)品上使用顯然占地方太大了，于是乎DV和DC產(chǎn)品普遍出現(xiàn)了HDMIC型口，也就是MiniHDMI接口。

　　不過對(duì)于手機(jī)而言，C型口依然有點(diǎn)大，于是D型口就應(yīng)運(yùn)而生，由于發(fā)布時(shí)間較短，到現(xiàn)在也不過半年時(shí)間，接口太小，對(duì)于高頻率視頻信號(hào)的傳輸、防靜電要求等都比A型口要困難的多，XT800是我們首先有機(jī)會(huì)了解到的HDMID型口應(yīng)用設(shè)備，而轉(zhuǎn)接線就比較難找，筆者經(jīng)多方面尋找，終于在淘寶上找到了一根綠聯(lián)科技的D型口轉(zhuǎn)A型口線材，有了它，連接電視、顯示器、投影機(jī)都不再是難事。

　　一端為標(biāo)準(zhǔn)的HDMI插頭，一端為Micro HDMI(D type)手機(jī)，目前部份手機(jī)有此接口。如：Motorola XT800,Nokia N8 and HTC EVO 4G 。

Pin Pin定義
1 TMDS Data2 Shield
2 TMDS Data2+
3 TMDS Data2–
4 TMDS Data1 Shield
5 TMDS Data1+
6 TMDS Data1–
7 TMDS Data0 Shield
8 TMDS Data0+
9 TMDS Data0–
10 TMDS Clock Shield
11 TMDS Clock+
12 TMDS Clock–
13 DDC/CEC Ground
14 CEC
15 SCL
16 SDA
17 Reserved (N.C. on device)
18 +5V Power
19 Hot Plug Detect

　英文定義：

　　 Digital interface defined around DVI 1.0 that transmits video and audio on the same physical channel.

　　 Interface defined for use in the consumer market space.

　　zRequires separate licensing from that of DDWG’s DVI.

　　zAllows DVI/HDMI products to be sold in consumer products

　　 Supports the use of HDCP copy protection.

　　 Utilizes VESA’s Display Data Channel to read E-EDID from a display.

　　 Defines a different connector from that used on DVI.

　　 Supports optional CEC (Consumer Electronics Control), which allows high level control of all A/V products in a user environment.

　　DVI 1.0: The Physical Interface

　　 Digital Visual Interface (DVI) was developed by a group called the Digital Display Working Group or DDWG for the PC market.

　　 The interface is a high speed digital serial interface based on Transition Minimized Differential Signaling or TMDS.

　　zSource synchronous architecture. Uses a separate channel to transmit the clock.

　　zUsed to provide variable data rates to handle the various VESA supported display resolutions.

　　 A complete connection from the source to the sink devices uses three data channels (RGB/YCbCr) and a clock.

　　HDMI = DVI + Audio

　　 Using the DVI physical link to transmit video/graphics

　　 Audio is added as a logical layer to the DVI phy.

　　zDigital audio processed into packets of data

　　zThese packets are scheduled for transmission during existing horizontal and vertical blanking times within a frame.

　　 In addition, HDMI implements a packet called an infoFrame.

　　zInfoFramesare structures defined in the EIA-861B specification

　　zEIA-861B is spec for DTV and uncompressed high speed digital interfaces.

　　What is HDMI Data?

　　 There are three categories of data that is transmitted via an HDMI link.

　　zVideo Data –Video pixel data (8b data encoded to 10b), and Guard Bands (fixed 10b pattern)

　　zData Islａnd –Packet data, which can be either audio samples or Infoframes(TERC4 encoded, 4b encoded to 10b) as well as its own Guard Bａnd (fixed 10b pattern).

　　zControl –Control period coding, in which we find HSYNC, VSYNC (2b to 10b encoding) and a Preamble (used to determine whether subsequent data is video or data island)

　　Transmission of Video/Graphics

　　 HDMI transmits 24bit pixel data via three separate channels.

　　 Pixel rates supported are 25MHz to 165MHz.

　　zThis is exactly the same as single link DVI 1.0

　　 Also supports video rates below 25MHz e.g. 13.5MHz for 480i NTSC signals.

　　zAchieves this through a “pixel-repetition”scheme.

　　 Can handle pixel data in RGB, YCbCr(4-4-4), YCbCr(4-2-2) formats.

　　zIn all cases 24 bits of data per pixel clock are transmitted.

　　Transmission of Audio

　　 Basic Audio is provided via an IEC60958 audio stream at 33kHz, 44.1kHz, or 48kHz.

　　zAccommodates any normal stereo audio stream.

　　 Optionally this stream can be sent as a single channel at 192kHz.

　　 Can support IEC61937 compressed formats as found in surround-sound, Dolby Digital, etc. at rates up to 192kHz.

　　Infoframes and HDMI

　　 EIA/CEA-861B specifies a special packet called an infoframe

　　 HDMI sources and sinks are expected to use two basic infoframes.

　　zAVI (Auxiliary Video Information) Infoframe

　　 Communicates Colorimetry, Picture aspect ratio, Pixel-Repetition factor, RGB or YCbCrindicator, and others specified within 861B standard.

　　zAudio Infoframe

　　 Communicates, Channel count, Coding Type, Sample size, Sample frequency, Channel allocation and other audio specific information.

　　 There are other types of infoframes that are supported by the 861B standard, but are optional with respect to HDMI specification