INVETIGACION DVI and HDMI
DVI
digital video interface or digital visual interface (DVI English, "digital visual interface" or "digital video interface) is a video connector designed for maximum visual quality possible in digital displays such as LCD monitors, flat screen digital projectors. Was developed by the industrial consortium DDWG (Digital Display Working Group, Working Group for Digital Screen).
The brightness of pixels is transmitted as a list of binary numbers. When the display is set to its native resolution, only has to read each number and apply that brightness to the appropriate pixel. Thus, each pixel in the output buffer source directly corresponds to a pixel on the screen.
The DVI uses TMDS (Transition Minimized Differential Signaling, "Transition Minimized Differential Signal). A link DVI cable is a four twisted pairs: one for each primary color (red, green, and blue) and one for the "clock" (which synchronizes the transmission), the entire screen is transmitted constantly.
The DVI connector usually has pins to transmit digital signals native DVI. In dual-link systems, additional pins are provided to the second signal. You may also have pins to transmit standard analog VGA.
DVI connectors are classified into three types depending on what signals supported:
DVI-D (digital only)
DVI-A (analog only)
DVI-I (digital and analog)
Sometimes referred to as DVI-DL to the connectors that support two links.
minimum clock frequency: 21.76 MHz
Maximum clock frequency for single link: 165 MHz
Maximum clock frequency double bond, limited only by the cable
Pixels per clock cycle: 1 (single link) or 2 (dual link)
Bits per pixel: 24
pin numbers (jack view)
1 2 3 4 5 6 7 8 C1 C2
9 10 11 12 13 14 15 16 C5
17 18 19 20 21 22 23 24 C3 C4
Functions Pin Pin Name Function
1 TMDS Data 2 - Digital red - (Link 1)
2 TMDS Data 2 + Digital red + (Link 1)
3 Protection TMDS data 2 / 4
4 TMDS Data 4 - Digital green - (Link 2)
5 TMDS Data 4 + Digital green + (Link 2)
6 DDC Clock
7 DDC Data
8 vertical synchronization analog
9 TMDS Data 1 - Digital green - (Link 1)
10 TMDS Data 1 + Digital green + (Link 1)
11 Protection TMDS data 1 / 3
12 TMDS Data 3 - Digital Blue - (Link 2)
13 TMDS Data 3 + Digital blue + (Link 2)
14 +5 V Power for monitor expected
15 Ground Return for pin 14 and analog sync
16 Hot Plug Detect
17 TMDS data 0 - Digital Blue - (Link 1) and digital synchronization
18 TMDS Data 0 + Blue Digital + (Link 1) and digital sync
19 Protection TMDS data 0 / 5
20 TMDS Data 5 - Digital red - (Link 2)
21 TMDS Data 5 + Red Digital + (Link 2)
22 Protection TMDS Clock
23 TMDS Clock + Digital clock + (Links 1 and 2)
24 TMDS Clock-Digital clock - (Links 1 and 2)
C1 Analog Red
C2 Analog Green
C3 Blue analog
C4 Analog horizontal sync
C5 Ground (analog) signals Return to Red, Green and Blue
HDMI
HDMIHigh-Definition Multi-media Interface (HDMI)-High Definition Multimedia Interface, is a standard digital video and audio without compression and supported by industry, it is expected the replacement of the scart. HDMI provides an interface between any audio source and digital video.
HDMI allows the use of standard video, enhanced or high definition video and multichannel digital audio in one cable. Is independent of the various DTV standards as ATSC, DVB (-T,-S,-C), which are only MPEG data encapsulation. After being sent to a decoder, we obtain uncompressed video data, can be high definition. These data are encoded into TMDS for transmission digitally via HDMI. HDMI also includes 8 channels of uncompressed digital audio. From version 1.2, HDMI can use up to 8 audio channels a bit. The one-bit audio is used on Super Audio CDs.
standard connector HDMI Type A has 19 pins. It has also defined a higher resolution version-type B-, but its use has not been widespread. Type B has 29 pins, allowing a channel to bring expanded video for high-resolution displays. Type B was designed for resolutions higher than 1080p format.
The HDMI Type A is compatible with single link DVI, used by computer monitors and modern graphics cards. This means that a DVI source can be connected to an HDMI monitor, or vice versa, by means of a suitable adapter or cable, but the audio and remote control features of HDMI will not be available. Furthermore, without the use of HDCP, the video quality and resolution may be degraded artificially by the signal source to prevent the end user to view or, mostly, copy protected content. The Type B HDMI is similarly backward-compatible with dual link DVI.
Take audio, video and data auxiliaries.
signaling Method: According to DVI 1.0 specification, single link (HDMI type A) or double bond (HDMI type B).
video pixel rate: 25 MHz to 165 MHz (Type A) or 330 MHz (type B). Video formats below 25MHz (eg 13.5MHz for 480i/NTSC) are transmitted using a pixel-repetition scheme. It can transmit up to 24 bits per pixel, regardless of frequency.
Coding pixels: RGB 4:4:4, YCbCr 4:2:2, YCbCr 4:4:4.
audio sampling frequencies: 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz.
Audio channels: up to 8.
details connector (eg connector: Molex 500254-1907)
Assignment pin-type connector Pin Signal Assignment
pin funcion
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
15 SCL
16 SDA
17 DDC / CEC
18 +5 V Power
19 Detection of connection "Hot" (Hot Plug)
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