CN105227888A - A kind of dispensing device of VGA vision signal, receiving system and transmission system - Google Patents
A kind of dispensing device of VGA vision signal, receiving system and transmission system Download PDFInfo
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- CN105227888A CN105227888A CN201510620906.8A CN201510620906A CN105227888A CN 105227888 A CN105227888 A CN 105227888A CN 201510620906 A CN201510620906 A CN 201510620906A CN 105227888 A CN105227888 A CN 105227888A
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Abstract
The invention provides a kind of dispensing device of VGA vision signal, receiving system and transmission system, this dispensing device, comprising: a VGA signal input unit is connected with rgb signal coding unit, a DDC signal processing unit respectively; Rgb signal coding unit, a DDC signal processing unit are all connected with a VGA signal output unit; Rgb signal coding unit, R signal, G-signal, B signal, line synchronizing signal, field sync signal for sending a VGA signal input unit carry out differential signal conversion, and the R+ signal be converted to and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals are exported to a VGA signal output unit; One DDC signal processing unit, is decoded as the differential signal carrying EDID sent by a VGA signal output unit I carrying EDID
2c signal, will carry the I of EDID
2c signal sends to a VGA signal input unit.The scheme that the invention provides, can improve the transmission range of VGA vision signal.
Description
Technical field
The present invention relates to electronic technology field, particularly the dispensing device of a kind of VGA (VideoGraphicsArray, Video Graphics Array) vision signal, receiving system and transmission system.
Background technology
Along with the development of signal transmission technology, the antijamming capability of Signal transmissions, maximum can transmission range be two important technical indicators.VGA is a kind of video transmission standard, has the advantages such as resolution is high, display speed is fast, various colors, is widely used in color monitor field.
VGA video signal transmission is relatively strict to the impedance matching of cable, and cannot realize the transmission of long distance of more than 100 meters, is connected in series signal amplifier realizes also can only transmitting 30-50 rice even if middle.
Summary of the invention
In view of this, the invention provides a kind of dispensing device of VGA vision signal, receiving system and transmission system, the transmission range of VGA vision signal can be improved.
First aspect, the invention provides a kind of dispensing device of VGA vision signal, comprising:
One VGA signal input unit is connected with rgb signal coding unit, the first DDC DDC signal processing unit respectively; Described rgb signal coding unit, a described DDC signal processing unit are all connected with a VGA signal output unit;
A described VGA signal input unit, R signal, G-signal, B signal, line synchronizing signal, field sync signal for being inputted outside are transferred to described rgb signal coding unit, externally export the I carrying extending display identification data EDID that a DDC signal processing unit is sent
2c signal;
Described rgb signal coding unit, for carrying out differential signal conversion to R signal, G-signal, B signal, line synchronizing signal, field sync signal, the R+ signal be converted to and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals are exported to a described VGA signal output unit;
A described DDC signal processing unit, is decoded as the differential signal carrying EDID sent by a VGA signal output unit I carrying EDID
2c signal, will carry the I of EDID
2c signal sends to a described VGA signal input unit;
A described VGA signal output unit, outside is sent to for the R+ signal sent by described rgb signal coding unit and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the outside differential signal carrying EDID sent, the differential signal carrying EDID is sent to a described DDC signal processing unit.
Further, described rgb signal coding unit, comprising:
EL4543 chip
pin, INA-pin, INB-pin, INC-pin, the equal ground connection of VS-pin;
The INA+ pin of described EL4543 chip is connected with the first end of resistance R1, and the holding wire of the R signal exported with a described VGA signal input unit is connected;
The INB+ pin of described EL4543 chip is connected with the first end of resistance R2, and the holding wire of the G-signal exported with a described VGA signal input unit is connected;
The INC+ pin of described EL4543 chip is connected with the first end of resistance R3, and the holding wire of the B signal exported with a described VGA signal input unit is connected;
The VSYNC pin of described EL4543 chip is connected with the first end of resistance R4, and the holding wire of the field sync signal exported with a described VGA signal input unit is connected;
The HSYNC pin of described EL4543 chip is connected with the first end of resistance R5, and the holding wire of the line synchronizing signal exported with a described VGA signal input unit is connected;
The equal ground connection of second end of second end of described resistance R1, second end of described resistance R2, second end of described resistance R3, second end of described resistance R4 and described resistance R5;
The OUTA+ pin of described EL4543 chip is connected with the first end of resistance R6, and second end of described resistance R6 is for exporting R+ signal;
The OUTA-pin of described EL4543 chip is connected with the first end of resistance R7, and second end of described resistance R7 is for exporting R-signal;
The OUTB+ pin of described EL4543 chip is connected with the first end of resistance R8, and second end of described resistance R8 is for exporting G+ signal;
The OUTB-pin of described EL4543 chip is connected with the first end of resistance R9, and second end of described resistance R9 is for exporting G-signal;
The OUTC+ pin of described EL4543 chip is connected with the first end of resistance R10, and second end of described resistance R10 is for exporting B+ signal;
The OUTC-pin of described EL4543 chip is connected with the first end of resistance R11, and second end of described resistance R11 is for exporting B-signal;
Described VS+ pin connects the first end of driving voltage and electric capacity respectively, the second end ground connection of described electric capacity.
Further, the resistance of described resistance R1, described resistance R2, described resistance R3, described resistance R4, described resistance R5 is all 75 Ω, the resistance of described resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11 is all 50 Ω, and the capacitance of described electric capacity is 0.1 μ F.
Further, the differential signal carrying EDID described in comprises: the RS485 differential signal carrying EDID.
Further, a described DDC signal processing unit, the differential signal carrying EDID for being sent by a described VGA signal output unit is converted to the logic gates TTL signal carrying EDID, and the TTL signal of the described EDID of carrying is converted to the I carrying EDID
2c signal.
Second aspect, the invention provides a kind of receiving system of VGA vision signal, comprising:
2nd VGA signal input unit is connected with rgb signal decoding unit, the second DDC DDC signal processing unit respectively; Described rgb signal decoding unit, described 2nd DDC signal processing unit are all connected with the 2nd VGA signal output unit;
Described 2nd VGA signal input unit, give described rgb signal decoding unit for the R+ signal that inputted outside and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, externally export the differential signal carrying extending display identification data EDID that described 2nd DDC signal processing unit is sent;
Described rgb signal decoding unit, for carrying out signal conversion to R+ signal and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals, the R signal be converted to, G-signal, B signal, line synchronizing signal and field sync signal are exported to described 2nd VGA signal output unit;
Described 2nd DDC signal processing unit, for the I carrying EDID sent by the 2nd VGA signal output unit
2c Signal coding is the differential signal carrying EDID, the differential signal carrying EDID is sent to described 2nd VGA signal input unit;
Described 2nd VGA signal output unit, sends to outside for R signal, G-signal, B signal, line synchronizing signal and the field sync signal sent by described rgb signal decoding unit, the I carrying EDID sent outside
2c signal sends to described 2nd DDC signal processing unit.
Further, also comprise: RGB compensation of delay unit;
Described RGB compensation of delay unit is connected with described rgb signal decoding unit, described 2nd VGA signal output unit respectively;
Described rgb signal decoding unit, for will export R signal, G-signal, B Signal transmissions is to described RGB delay unit;
Described RGB compensation of delay unit, for the time delayed signal inputted according to outside, time delay output is carried out to the signal referred to arbitrarily in the R signal received, G-signal, B signal, after carrying out time delay, R signal, G-signal, B signal is exported to described 2nd VGA signal output unit.
Further, described RGB compensation of delay unit, comprising: R signal knob, G-signal knob, B signal knob, micro-control unit MCU, ISL59921 chip;
Described R signal knob, described G-signal knob are all connected with described MCU with described B signal knob, and described MCU is connected with described ISL59921 chip;
Described time delayed signal comprises: the 3rd delay time of the first delay time of R signal, the second delay time of G-signal, B signal;
Described R signal knob, for inputting the first delay time of R signal to described MCU;
Described G-signal knob, for inputting the second delay time of G-signal to described MCU;
Described B signal knob, for inputting the 3rd delay time of B signal to described MCU;
Described MCU, for described first delay time is write described ISL59921 chip, writes described ISL59921 chip by described second delay time, and described 3rd delay time is write described ISL59921 chip;
Described ISL59921 chip, for the first delay time that basis receives, to the first delay time described in R signal time delay, according to the second delay time received, to the second delay time described in G-signal time delay, according to the 3rd delay time received, to the 3rd delay time described in B signal lag.
Further, the differential signal carrying EDID described in comprises: the RS485 differential signal carrying EDID.
Further, described 2nd DDC signal processing unit, for the I carrying EDID sent by described 2nd VGA signal output unit
2c signal is converted to the logic gates TTL signal carrying EDID, and the TTL signal carrying EDID is converted to the differential signal carrying EDID.
The third aspect, the invention provides a kind of transmission system of VGA vision signal, comprising:
As the dispensing device of the VGA vision signal as described in arbitrary in first aspect, the receiving system as the VGA vision signal as described in arbitrary in second aspect;
A described VGA signal output unit of described dispensing device is connected with the described 2nd VGA signal input unit of described receiving system.
Further, this transmission system comprises:
A described VGA signal output unit is connected with a RJ45 interface, and described 2nd VGA signal input unit is connected with the 2nd RJ45 interface; A described RJ45 interface is connected by direct-connected peer line with described 2nd RJ45 interface;
A described VGA signal output unit, send to a described RJ45 interface for the R+ signal sent by described rgb signal coding unit and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the differential signal carrying extending display identification data EDID that a described RJ45 interface sends;
Described 2nd VGA signal input unit, for giving described rgb signal decoding unit by the R+ signal of described 2nd RJ45 interface input and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, to the differential signal carrying EDID that the described 2nd DDC signal processing unit of described 2nd RJ45 interface output is sent.
The invention provides a kind of dispensing device of VGA vision signal, receiving system and transmission system, R signal, G-signal, B signal are converted to differential signal by dispensing device, and differential signal is carried out long-distance transmissions, receiving system will receive that differential signal converts R signal to, G-signal, B signal show, enhance the antijamming capability of analog signal transmission, greatly improve the transmission range of VGA vision signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the dispensing device of a kind of VGA vision signal that one embodiment of the invention provides;
Fig. 2 is the circuit diagram of a kind of rgb signal coding unit that one embodiment of the invention provides;
Fig. 3 is the schematic diagram of the dispensing device of the another kind of VGA vision signal that one embodiment of the invention provides;
Fig. 4 is the schematic diagram of the receiving system of a kind of VGA vision signal that one embodiment of the invention provides;
Fig. 5 is the schematic diagram of the receiving system of the another kind of VGA vision signal that one embodiment of the invention provides;
Fig. 6 is the schematic diagram of the receiving system of another VGA vision signal that one embodiment of the invention provides;
Fig. 7 is the schematic diagram of the transmission system of a kind of VGA vision signal that one embodiment of the invention provides.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly; below in conjunction with the accompanying drawing in the embodiment of the present invention; technical scheme in the embodiment of the present invention is clearly and completely described; obviously; described embodiment is the present invention's part embodiment, instead of whole embodiments, based on the embodiment in the present invention; the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, embodiments provide a kind of dispensing device of VGA vision signal, this device can comprise:
One VGA signal input unit 101 is connected with rgb signal coding unit 102, a DDC (DisplayDataChannel, DDC) signal processing unit 103 respectively; Described rgb signal coding unit 102, a described DDC signal processing unit 103 are all connected with a VGA signal output unit 104;
A described VGA signal input unit 101, R signal, G-signal, B signal, line synchronizing signal, field sync signal for being inputted outside are transferred to described rgb signal coding unit 102, externally export the I carrying EDID (ExtendedDisplayIdentificationData, extending display identification data) that a DDC signal processing unit 103 is sent
2c signal;
Described rgb signal coding unit 102, for carrying out differential signal conversion to R signal, G-signal, B signal, line synchronizing signal, field sync signal, the R+ signal be converted to and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals are exported to a described VGA signal output unit 104;
A described DDC signal processing unit 103, is decoded as the differential signal carrying EDID sent by a VGA signal output unit 104 I carrying EDID
2c signal, will carry the I of EDID
2c signal sends to a described VGA signal input unit 101;
A described VGA signal output unit 104, outside is sent to for the R+ signal sent by described rgb signal coding unit 102 and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the outside differential signal carrying EDID sent, the differential signal carrying EDID is sent to a described DDC signal processing unit 103.
The dispensing device of a kind of VGA vision signal provided by the embodiment of the present invention, by rgb signal coding unit, R signal, G-signal, B signal, line synchronizing signal, field sync signal are carried out differential signal conversion, be converted to three pairs of differential signals, export with the form of differential signal, the transmission range of VGA vision signal can be improved.In addition, receive the outside differential signal carrying EDID sent, the differential signal carrying EDID is converted to the I carrying EDID
2c signal, makes main frame to identify display device, ensures the normal display of VGA vision signal.
In a kind of possible implementation, described rgb signal coding unit 102, comprising:
The pin of EL4543 chip, INA-pin, INB-pin, INC-pin, the equal ground connection of VS-pin;
The INA+ pin of described EL4543 chip is connected with the first end of resistance R1, and the holding wire of the R signal exported with a described VGA signal input unit is connected;
The INB+ pin of described EL4543 chip is connected with the first end of resistance R2, and the holding wire of the G-signal exported with a described VGA signal input unit is connected;
The INC+ pin of described EL4543 chip is connected with the first end of resistance R3, and the holding wire of the B signal exported with a described VGA signal input unit is connected;
The VSYNC pin of described EL4543 chip is connected with the first end of resistance R4, and the holding wire of the field sync signal exported with a described VGA signal input unit is connected;
The HSYNC pin of described EL4543 chip is connected with the first end of resistance R5, and the holding wire of the line synchronizing signal exported with a described VGA signal input unit is connected;
The equal ground connection of second end of second end of described resistance R1, second end of described resistance R2, second end of described resistance R3, second end of described resistance R4 and described resistance R5;
The OUTA+ pin of described EL4543 chip is connected with the first end of resistance R6, and second end of described resistance R6 is for exporting R+ signal;
The OUTA-pin of described EL4543 chip is connected with the first end of resistance R7, and second end of described resistance R7 is for exporting R-signal;
The OUTB+ pin of described EL4543 chip is connected with the first end of resistance R8, and second end of described resistance R8 is for exporting G+ signal;
The OUTB-pin of described EL4543 chip is connected with the first end of resistance R9, and second end of described resistance R9 is for exporting G-signal;
The OUTC+ pin of described EL4543 chip is connected with the first end of resistance R10, and second end of described resistance R10 is for exporting B+ signal;
The OUTC-pin of described EL4543 chip is connected with the first end of resistance R11, and second end of described resistance R11 is for exporting B-signal;
Described VS+ pin connects the first end of driving voltage and electric capacity respectively, the second end ground connection of described electric capacity.
Wherein, the resistance of described resistance R1, described resistance R2, described resistance R3, described resistance R4, described resistance R5 is all 75 Ω, the resistance of described resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11 is all 50 Ω, and the capacitance of described electric capacity is 0.1 μ F.
The circuit of the rgb signal coding unit 102 in this implementation as shown in Figure 2.
In a kind of possible implementation, described in carry EDID differential signal comprise: the RS485 differential signal carrying EDID.
In a kind of possible implementation, a described DDC signal processing unit, the differential signal carrying EDID for being sent by a described VGA signal output unit is converted to the TTL (TransistorTransistorLogic carrying EDID, logic gates signal) signal, the TTL signal of the described EDID of carrying is converted to the I carrying EDID
2c signal.
In addition, in general, a VGA signal input unit 101 is connected with main frame, when main frame receives the I carrying EDID
2during C signal, can return to a VGA signal input unit 101 and receive successful response signal, this response signal can export through a VGA signal input unit 101, a DDC signal processing unit 103, a VGA signal output unit 104 successively.
Described rgb signal coding unit 102 pairs of R signal, G-signal, B signal, line synchronizing signal, field sync signal carry out differential signal conversion, generally line synchronizing signal and field sync signal are distinguished numbers pile up in a pair differential signal, such as: R+ signal and R-signal.
Further, a DDC signal processing unit 103 can pass through MCU (MicrocontrollerUnit, micro-control unit) and realizes.Dispensing device also has the unit such as mains switch and relevant indicator light.
As shown in Figure 3, the dispensing device of a kind of VGA vision signal that the embodiment of the present invention provides, there is shown the signal transduction process between each unit, wherein, carries the I of EDID
2c signal is made up of SDA (SerialData, serial data signal) and SCL (SerialClock, serial clock signal).
As shown in Figure 4, embodiments provide a kind of receiving system of VGA vision signal, comprising:
2nd VGA signal input unit 401 is connected with rgb signal decoding unit 402, the 2nd DDC signal processing unit 403 respectively; Described rgb signal decoding unit 402, described 2nd DDC signal processing unit 403 are all connected with the 2nd VGA signal output unit 404;
Described 2nd VGA signal input unit 401, give described rgb signal decoding unit 402 for the R+ signal that inputted outside and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, externally export the differential signal carrying extending display identification data EDID that described 2nd DDC signal processing unit 403 is sent;
Described rgb signal decoding unit 402, for carrying out signal conversion to R+ signal and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals, the R signal be converted to, G-signal, B signal, line synchronizing signal and field sync signal are exported to described 2nd VGA signal output unit 404;
Described 2nd DDC signal processing unit 403, for the I carrying EDID sent by the 2nd VGA signal output unit 404
2c Signal coding is the differential signal carrying EDID, the differential signal carrying EDID is sent to described 2nd VGA signal input unit 401;
Described 2nd VGA signal output unit 404, sends to outside for R signal, G-signal, B signal, line synchronizing signal and the field sync signal sent by described rgb signal decoding unit 402, the I carrying EDID sent outside
2c signal sends to described 2nd DDC signal processing unit 403.
Because R signal, G-signal, B signal may occur nonsynchronous situation in transmitting procedure, in order to adjust transmission error, optimize display effect, in a kind of possible implementation, this device also comprises: RGB compensation of delay unit;
Described RGB compensation of delay unit is connected with described rgb signal decoding unit, described 2nd VGA signal output unit respectively;
Described rgb signal decoding unit, for will export R signal, G-signal, B Signal transmissions is to described RGB delay unit;
Described RGB compensation of delay unit, for the time delayed signal inputted according to outside, time delay output is carried out to the signal referred to arbitrarily in the R signal received, G-signal, B signal, after carrying out time delay, R signal, G-signal, B signal is exported to described 2nd VGA signal output unit.
Based on this implementation, the receiving system of a kind of VGA vision signal as shown in Figure 5, this device also comprises: the 2nd VGA signal input unit 401, rgb signal decoding unit 402, the 2nd DDC signal processing unit 403, the 2nd VGA signal output unit 404, RGB compensation of delay unit 405.
In a kind of possible implementation, described RGB compensation of delay unit, comprising: R signal knob, G-signal knob, B signal knob, micro-control unit MCU, ISL59921 chip;
Described R signal knob, described G-signal knob are all connected with described MCU with described B signal knob, and described MCU is connected with described ISL59921 chip;
Described time delayed signal comprises: the 3rd delay time of the first delay time of R signal, the second delay time of G-signal, B signal;
Described R signal knob, for inputting the first delay time of R signal to described MCU;
Described G-signal knob, for inputting the second delay time of G-signal to described MCU;
Described B signal knob, for inputting the 3rd delay time of B signal to described MCU;
Described MCU, for described first delay time is write described ISL59921 chip, writes described ISL59921 chip by described second delay time, and described 3rd delay time is write described ISL59921 chip;
Described ISL59921 chip, for the first delay time that basis receives, to the first delay time described in R signal time delay, according to the second delay time received, to the second delay time described in G-signal time delay, according to the 3rd delay time received, to the 3rd delay time described in B signal lag.
In a kind of possible implementation, described in carry EDID differential signal comprise: the RS485 differential signal carrying EDID.
In a kind of possible implementation, described 2nd DDC signal processing unit, for the I carrying EDID sent by described 2nd VGA signal output unit
2c signal is converted to the logic gates TTL signal carrying EDID, and the TTL signal carrying EDID is converted to the differential signal carrying EDID.
2nd DDC signal processing unit can be realized by MCU, in RGB compensation of delay unit MCU with can be realized by same MCU for the MCU realizing the 2nd DDC signal processing unit.
As shown in Figure 6, the receiving system of a kind of VGA vision signal that the embodiment of the present invention provides, there is shown the signal transduction process between each unit, wherein, carries the I of EDID
2c signal is made up of SDA (SerialData, serial data signal) and SCL (SerialClock, serial clock signal).
See Fig. 7, embodiments provide a kind of transmission system of VGA vision signal, comprising:
The receiving system 702 of arbitrary VGA vision signal in the dispensing device 701 of arbitrary VGA vision signal, above-described embodiment in above-described embodiment;
A described VGA signal output unit of described dispensing device 701 is connected with the described 2nd VGA signal input unit of described receiving system.
In a kind of possible implementation, comprising:
A described VGA signal output unit is connected with a RJ45 interface, and described 2nd VGA signal input unit is connected with the 2nd RJ45 interface; A described RJ45 interface is connected by direct-connected peer line with described 2nd RJ45 interface;
A described VGA signal output unit, send to a described RJ45 interface for the R+ signal sent by described rgb signal coding unit and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the differential signal carrying extending display identification data EDID that a described RJ45 interface sends;
Described 2nd VGA signal input unit, for giving described rgb signal decoding unit by the R+ signal of described 2nd RJ45 interface input and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, to the differential signal carrying EDID that the described 2nd DDC signal processing unit of described 2nd RJ45 interface output is sent.
In the transmission system of a kind of VGA vision signal that the embodiment of the present invention provides, outside main frame is connected with dispensing device, and dispensing device is connected with receiving system, and receiving system is connected with the display unit of outside.The concrete course of work is as follows:
On the one hand, outside main frame is by R signal, G-signal, B signal, line synchronizing signal, field sync signal sends to a VGA signal input unit of dispensing device, and a VGA signal input unit is by R signal, G-signal, B signal, line synchronizing signal, field sync signal sends to rgb signal coding unit, and the Signal coding received is three pairs of differential signals by rgb signal coding unit, is R+ signal and R-signal respectively, G+ signal and G-signal, B+ signal and B-signal, these three pairs of differential signals are sent to a VGA signal output unit, one VGA signal output unit by netting twine by these three pairs of differential signal transmission to the 2nd VGA signal input unit of receiving system, the differential signal received is sent to rgb signal decoding unit by the 2nd VGA signal input unit, and rgb signal decoding unit is by R+ signal and R-signal, G+ signal and G-signal, B+ signal and B-signal decoding are R signal, G-signal, B signal, line synchronizing signal, field sync signal, wherein, line synchronizing signal and field sync signal are directly sent to the 2nd VGA signal output unit, by R signal by rgb signal decoding unit, G-signal and B signal send to RGB compensation of delay unit, and RGB compensation of delay unit passes through the time delayed signal of outside input to R signal, G-signal and B signal, optimize VGA vision signal display effect on the display device, RGB compensation of delay unit is by the R signal after time delay, G-signal and B signal send to the 2nd VGA signal output unit, and the 2nd VGA signal output unit is by R signal, G-signal, B signal, line synchronizing signal, field sync signal exports to outside display device, and outside display device shows the VGA vision signal received.
On the other hand, outside display unit will carry the I of EDID
2c signal sends to the 2nd VGA signal output unit, and the 2nd VGA signal output unit will carry the I of EDID
2c signal sends to the 2nd DDC signal processing unit, and the 2nd DDC signal processing unit will carry the I of EDID
2c signal is converted to the RS485 differential signal carrying EDID, and send to the 2nd VGA signal input unit, the RS485 differential signal carrying EDID is sent to a VGA signal output unit by netting twine by the 2nd VGA signal input unit, the RS485 differential signal carrying EDID is sent to a DDC signal processing unit by the one VGA signal output unit, and the RS485 differential signal carrying EDID received is converted to the I carrying EDID by a DDC signal processing unit
2c signal, and send to a VGA signal input unit, a VGA signal input unit will carry the I of EDID
2c signal sends to outside main frame, and outside main frame identifies outside display device according to EDID, and returns the successful response signal of reception.
The dispensing device of a kind of VGA vision signal that the embodiment of the present invention provides, receiving system and transmission system, have following beneficial effect:
The dispensing device of a kind of VGA vision signal 1, provided by the embodiment of the present invention, by rgb signal coding unit, R signal, G-signal, B signal, line synchronizing signal, field sync signal are carried out differential signal conversion, be converted to three pairs of differential signals, export with the form of differential signal, the transmission range of VGA vision signal can be improved.In addition, receive the outside differential signal carrying EDID sent, the differential signal carrying EDID is converted to the I carrying EDID
2c signal, makes main frame to identify display device, ensures the normal display of VGA vision signal.
The receiving system of a kind of VGA vision signal 2, provided by the embodiment of the present invention, the differential signal of VGA vision signal is decoded, VGA vision signal can normally be shown, and the information of display device conversion differential signal is sent, make the identification display device that main frame can be correct.
The receiving system of a kind of VGA vision signal 3, provided by the embodiment of the present invention, is compensated adjustment by RGB compensation of delay unit to the R signal received, G-signal, B signal, makes display effect better.
The transmission system of a kind of VGA vision signal 4, provided by the embodiment of the present invention, R signal, G-signal, B signal are converted to differential signal by dispensing device, and differential signal is carried out long-distance transmissions, receiving system will receive that differential signal converts R signal to, G-signal, B signal show, enhance the antijamming capability of analog signal transmission, greatly improve the transmission range of VGA vision signal.
It should be noted that, in this article, the relational terms of such as first and second and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element " being comprised " limited by statement, and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical factor.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in the storage medium of embodied on computer readable, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium in.
Finally it should be noted that: the foregoing is only preferred embodiment of the present invention, only for illustration of technical scheme of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a dispensing device for VGA vision signal, is characterized in that, comprising:
One VGA signal input unit is connected with rgb signal coding unit, the first DDC DDC signal processing unit respectively; Described rgb signal coding unit, a described DDC signal processing unit are all connected with a VGA signal output unit;
A described VGA signal input unit, R signal, G-signal, B signal, line synchronizing signal, field sync signal for being inputted outside are transferred to described rgb signal coding unit, externally export the I carrying extending display identification data EDID that a DDC signal processing unit is sent
2c signal;
Described rgb signal coding unit, for carrying out differential signal conversion to R signal, G-signal, B signal, line synchronizing signal, field sync signal, the R+ signal be converted to and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals are exported to a described VGA signal output unit;
A described DDC signal processing unit, is decoded as the differential signal carrying EDID sent by a VGA signal output unit I carrying EDID
2c signal, will carry the I of EDID
2c signal sends to a described VGA signal input unit;
A described VGA signal output unit, outside is sent to for the R+ signal sent by described rgb signal coding unit and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the outside differential signal carrying EDID sent, the differential signal carrying EDID is sent to a described DDC signal processing unit.
2. device according to claim 1, is characterized in that, described rgb signal coding unit, comprising:
EL4543 chip
pin, INA-pin, INB-pin, INC-pin, the equal ground connection of VS-pin;
The INA+ pin of described EL4543 chip is connected with the first end of resistance R1, and the holding wire of the R signal exported with a described VGA signal input unit is connected;
The INB+ pin of described EL4543 chip is connected with the first end of resistance R2, and the holding wire of the G-signal exported with a described VGA signal input unit is connected;
The INC+ pin of described EL4543 chip is connected with the first end of resistance R3, and the holding wire of the B signal exported with a described VGA signal input unit is connected;
The VSYNC pin of described EL4543 chip is connected with the first end of resistance R4, and the holding wire of the field sync signal exported with a described VGA signal input unit is connected;
The HSYNC pin of described EL4543 chip is connected with the first end of resistance R5, and the holding wire of the line synchronizing signal exported with a described VGA signal input unit is connected;
The equal ground connection of second end of second end of described resistance R1, second end of described resistance R2, second end of described resistance R3, second end of described resistance R4 and described resistance R5;
The OUTA+ pin of described EL4543 chip is connected with the first end of resistance R6, and second end of described resistance R6 is for exporting R+ signal;
The OUTA-pin of described EL4543 chip is connected with the first end of resistance R7, and second end of described resistance R7 is for exporting R-signal;
The OUTB+ pin of described EL4543 chip is connected with the first end of resistance R8, and second end of described resistance R8 is for exporting G+ signal;
The OUTB-pin of described EL4543 chip is connected with the first end of resistance R9, and second end of described resistance R9 is for exporting G-signal;
The OUTC+ pin of described EL4543 chip is connected with the first end of resistance R10, and second end of described resistance R10 is for exporting B+ signal;
The OUTC-pin of described EL4543 chip is connected with the first end of resistance R11, and second end of described resistance R11 is for exporting B-signal;
Described VS+ pin connects the first end of driving voltage and electric capacity respectively, the second end ground connection of described electric capacity.
3. device according to claim 2, it is characterized in that, the resistance of described resistance R1, described resistance R2, described resistance R3, described resistance R4, described resistance R5 is all 75 Ω, the resistance of described resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11 is all 50 Ω, and the capacitance of described electric capacity is 0.1 μ F.
4. device according to claim 1, is characterized in that, described in carry EDID differential signal comprise: the RS485 differential signal carrying EDID;
And/or a described DDC signal processing unit, is converted to for the differential signal carrying EDID sent by a described VGA signal output unit logic gates TTL signal carrying EDID, the TTL signal of the described EDID of carrying is converted to the I carrying EDID
2c signal.
5. a receiving system for VGA vision signal, is characterized in that, comprising:
2nd VGA signal input unit is connected with rgb signal decoding unit, the second DDC DDC signal processing unit respectively; Described rgb signal decoding unit, described 2nd DDC signal processing unit are all connected with the 2nd VGA signal output unit;
Described 2nd VGA signal input unit, give described rgb signal decoding unit for the R+ signal that inputted outside and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, externally export the differential signal carrying extending display identification data EDID that described 2nd DDC signal processing unit is sent;
Described rgb signal decoding unit, for carrying out signal conversion to R+ signal and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signals, the R signal be converted to, G-signal, B signal, line synchronizing signal and field sync signal are exported to described 2nd VGA signal output unit;
Described 2nd DDC signal processing unit, for the I carrying EDID sent by the 2nd VGA signal output unit
2c Signal coding is the differential signal carrying EDID, the differential signal carrying EDID is sent to described 2nd VGA signal input unit;
Described 2nd VGA signal output unit, sends to outside for R signal, G-signal, B signal, line synchronizing signal and the field sync signal sent by described rgb signal decoding unit, the I carrying EDID sent outside
2c signal sends to described 2nd DDC signal processing unit.
6. device according to claim 5, is characterized in that, also comprises: RGB compensation of delay unit;
Described RGB compensation of delay unit is connected with described rgb signal decoding unit, described 2nd VGA signal output unit respectively;
Described rgb signal decoding unit, for will export R signal, G-signal, B Signal transmissions is to described RGB delay unit;
Described RGB compensation of delay unit, for the time delayed signal inputted according to outside, time delay output is carried out to the signal referred to arbitrarily in the R signal received, G-signal, B signal, after carrying out time delay, R signal, G-signal, B signal is exported to described 2nd VGA signal output unit.
7. device according to claim 6, is characterized in that, described RGB compensation of delay unit, comprising: R signal knob, G-signal knob, B signal knob, micro-control unit MCU, ISL59921 chip;
Described R signal knob, described G-signal knob are all connected with described MCU with described B signal knob, and described MCU is connected with described ISL59921 chip;
Described time delayed signal comprises: the 3rd delay time of the first delay time of R signal, the second delay time of G-signal, B signal;
Described R signal knob, for inputting the first delay time of R signal to described MCU;
Described G-signal knob, for inputting the second delay time of G-signal to described MCU;
Described B signal knob, for inputting the 3rd delay time of B signal to described MCU;
Described MCU, for described first delay time is write described ISL59921 chip, writes described ISL59921 chip by described second delay time, and described 3rd delay time is write described ISL59921 chip;
Described ISL59921 chip, for the first delay time that basis receives, to the first delay time described in R signal time delay, according to the second delay time received, to the second delay time described in G-signal time delay, according to the 3rd delay time received, to the 3rd delay time described in B signal lag.
8. device according to claim 6, is characterized in that, comprising:
The differential signal of the described EDID of carrying comprises: the RS485 differential signal carrying EDID;
And/or described 2nd DDC signal processing unit, for the I carrying EDID sent by described 2nd VGA signal output unit
2c signal is converted to the logic gates TTL signal carrying EDID, and the TTL signal carrying EDID is converted to the differential signal carrying EDID.
9. a transmission system for VGA vision signal, is characterized in that, comprising:
As the dispensing device of the VGA vision signal as described in arbitrary in claim 1-3, the receiving system as the VGA vision signal as described in arbitrary in claim 4-6;
A described VGA signal output unit of described dispensing device is connected with the described 2nd VGA signal input unit of described receiving system.
10. transmission system according to claim 9, is characterized in that, comprising:
A described VGA signal output unit is connected with a RJ45 interface, and described 2nd VGA signal input unit is connected with the 2nd RJ45 interface; A described RJ45 interface is connected by direct-connected peer line with described 2nd RJ45 interface;
A described VGA signal output unit, send to a described RJ45 interface for the R+ signal sent by described rgb signal coding unit and R-signal, G+ signal and G-signal, B+ signal and B-signal, and receive the differential signal carrying extending display identification data EDID that a described RJ45 interface sends;
Described 2nd VGA signal input unit, for giving described rgb signal decoding unit by the R+ signal of described 2nd RJ45 interface input and R-signal, G+ signal and G-signal, B+ signal and B-signal three pairs of differential signal transmission, to the differential signal carrying EDID that the described 2nd DDC signal processing unit of described 2nd RJ45 interface output is sent.
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| CN201510620906.8A CN105227888A (en) | 2015-09-25 | 2015-09-25 | A kind of dispensing device of VGA vision signal, receiving system and transmission system |
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| CN201510620906.8A CN105227888A (en) | 2015-09-25 | 2015-09-25 | A kind of dispensing device of VGA vision signal, receiving system and transmission system |
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