The simulated signal connection of projector
1. Composite Video Signal: CVBS
Transmission Signal: The brightness signal and chroma signal join together through spectra superimpose. As a result of brightness and chromaticity signal mixing, therefore the CVBS signal needs to carry on the bright color separation, the good pectinate filter may obtain the high grade bright color separation. The pectinate filter only in carries on time the bright color separation to the television signal and the CVBS signal is useful.
2. S-Video Input
Video frequency connection transmission signal develops which along with the S-VHS videorecorder because the y signal and the color bright signal separate the transmission, therefore avoided the CVBS signal bright color string harassing the question.
3. Europe's standard video frequency connection: SCART
Transmission Signal: The SCART connection transmits the CVBS signal, the interlacing RGB signal, the usual factory all uses for SCART to transmit the RGB signal. Because the tertiary color signal separates the transmission, therefore displays in the chromaticity aspect S-Video is better than. SCART now only has transmits the 480I/576I interleaved signal standard.
4. Chromatic Aberration Input
American, China's standard video frequency connection: The transmission signal y signal and the difference signal separate the transmission, certainly S-video PB, the PR synthesis is the C signal transmits again must be better than. Difference signal and RGB tertiary color signal picture quality quite, but 3 RCA chromatic aberration mouth may transmit by the good signal or the 1080I signal. In the chromatic aberration input sign, the basically no factory comes according to the custom, each product mode of writing possibly is all dissimilar. Some product superscript notes "Y CB CR" the expression may accept the interlacing difference signal, but "Y PB PR" expression by good difference signal or HDTV difference signal, but "Y CB /PB CR /PR" denote that it can differentiate the interstage or ordinal chromatic aberration signal automatically. In the practical life, should as judge the form take the product actual explanation which the equipment may accept, but is not looked it "write" what. In the specialized domain, "Y CB CR" denote digital chromatic aberration signal and not simulant chromatic aberration signal.
5. RGBHV Input
RGBHV usually uses 5 BNC or 5 RCA plug, VW11HT has is 5 RCA plug. If must connect the PC video output VW11HT, needs VGA-5 RCA the extension wiring.
Transmission Signal: RGBHV transmits is and the VGA connection same video signal. Because in 5 BNC connection, RGB and the HV signal divides equally other uses a specialized BNC line transmission, but does not like in VGA all signals all in the VGA line, therefore 5 BNC transmission characteristic nature ratio VGA is better. In addition the plug good contact performance (brings tightens installment), 5 BNC usually in special-purpose demonstration domain use.
6. VGA-PC's 15 Stitch VGA Input Interface
Transmission Signal: The VGA connection may transmit now besides 480I/576I signal all signals. The VGA connection lowest signal standard is the VGA form (640*480@60Hz by line), therefore the VGA connection possibly does not support specification too low 480I/576I. The usual projector VGA connection may accept the 480I/576I signal, but charactron equipment (television and computer monitor) the VGA connection does not accept the 480I/576I signal. In the VGA connection has contained I 2C main line, therefore between the main engine and the graphic display device may consult and the automatic determination use best demonstration form, the realization "namely inserts namely uses".
The digital interface of projector
Digital Video Interface
1. USB Interface
Has the USB connection the projector at present very to be many, usually only is uses for to transmit the picture document.
IEEE1394 can use for to transmit the MPEG2 numerical code picture. Because IEEE1394 needs the quite complex expensive decoding system, equips IEEE1394 the projector very to be also rare. The ordinary optical fiber outputs (TOSLINK) only to support Dolby the Digital/DTS transmission, is unable to support DVD-A and the SACD high speed data transmission. Therefore in the upscale product, uses IEEE1394 to transmit the digital sound accompaniment.
3. P&D Interface
The video frequency electronic standard association (VESA) in most recent several years formulation standard, has not obtained the widespread application. P&D interface transfer a group of TMDS (Timing Minimized Differential Signal), two groups of IEEE1394 and group of USB signal, It is a common digital signal interface. "Tai" used to be one of the reasons for the failure P&D interface. Because many aspects of the considerations, resulting in the high costs, and can not be widely used. In the PC applications field, P&D only maximum support 1600*1200@60 Hz, this is leading to, P&D can not be one of the reasons why we accept.
4. DFP Interface
VESA considering that the P&D interface is too complex and the development of simplified interface. DFP interface He only after TMDS transmission of digital video signal encoding and transmission P&D is no longer the IEEE1394 and USB interface signals. Like the P&D, and also the highest support only 1600*1200@60 Hz, and thus can not be used in professional video field.
5. DVI Interface
Since P&D consider excessive "compatible", and the maximum transmission speed of DFP also limited, VESA DVI standard was enacted. DVI TMDS signal transmission support groups, the maximum support 2048*1536@75Hz format, it can be applied to ordinary projectors, PDP displays, LCD professional workstations to video transmission. DVI in the projector and plasma displays are more widely used, approximately 30%-50% of the high-grade products are DVI interface. But in 2003 the United States market, it is estimated that 70% of HDTV equipment will be equipped DVI/HDMI input.
6. HDMI Interface
HDMI interface and only a group of TMDS signal, the format was in the dissemination of the DFP has returned to the starting point, HDMI interface itself and DFP very similar. HDMI than DFP improvements joined the HDCP copyright protection, while an increase of digital audio transmission, which became dedicated multimedia messaging interface. HDMI supports 1920*1080P high-definition digital signals, and supports Dolby Digital/DTS digital audio format. HDMI is expected to become the future standard interface video equipment. The second half of 2003 will continue to have a variety of HDMI equipment.