CN1315065C - Transmission processing method and device for video frequency signal - Google Patents
Transmission processing method and device for video frequency signal Download PDFInfo
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- CN1315065C CN1315065C CNB2003101136123A CN200310113612A CN1315065C CN 1315065 C CN1315065 C CN 1315065C CN B2003101136123 A CNB2003101136123 A CN B2003101136123A CN 200310113612 A CN200310113612 A CN 200310113612A CN 1315065 C CN1315065 C CN 1315065C
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Abstract
The present invention discloses a processing method and a device for the transmission of video signals. A receiving end processes synchronous digital signals in a voltage division mode; video analogue signals and the synchronous digital signals processed in the voltage division mode are transmitted after being processed in an overlapping difference mode; the receiving end processes the received video signals in a differential signal reducing mode; video analogue signal separation and synchronous digital signal separation are carried out to the video signals after being processed in the reducing mode so as to complete the transmission of the video signals. The present invention can be used for realizing the long-distance transmission of the video signals between a host machine and a display device and simultaneously guaranteeing no distortion of the video signals.
Description
Background technology
The present invention relates to the video signal transmission field, particularly relate to a kind of transmission of video signals disposal route and device of being used for of using for the long-distance transmissions that realizes vision signal between main frame in computer system (HOST) and the display device.
Technical field
At present, in computer system, particularly in KVM (Keyboard/Video/Mouse) main frame switched system and other control system, distance between main frame (HOST) and the display device may reach rice up to a hundred, when main frame just relates to the long-distance transmissions problem of vision signal to video signal transmission during to display device.Main frame mainly comprises rgb signal (red, green, blue signal) and horizontal vertical synchronizing signal to the vision signal of display device one-way transmission.Wherein rgb signal is the tens high frequency video analog signals to the hundreds of megahertz, and range value less (generally having only several volts at zero point), and the horizontal vertical synchronizing signal is the digital signal of hundreds of hertz to several ten thousand hertz.Come transmission video signal by the video standard signal line that connects between general each main frame and the display device, rgb signal can be because the decay of transmission line or the interference that is subjected to extraneous other electric signal make signal generation distortion like this, and the influence that the horizontal vertical synchronizing signal is transmitted is more better.If but the distance of transmission video signal is far away between each main frame and the display device, because the existence of video standard signal line and each interface middle impedance, make vision signal in transmission course, the common place at video standard signal line two ends inevitably electric potential difference can occur, this also can bring very big influence to transmission of video signals, add above-mentionedly when long-distance transmissions, the degree of rgb signal in vision signal decay is very big.To sum up,, be difficult to obtain the video effect of user expectation, also make the transmission of video signals distance be subjected to very big restriction simultaneously at the display device end so utilize the directly vision signal of transmission from the main frame to the display device of video standard signal line.
In the prior art, for realizing the long-distance transmissions of vision signal, guarantee the fidelity effect of vision signal simultaneously, common way is with vision signal transmission again after host side is amplified with amplifying circuit, but shortcoming is an enlargement factor will carry out real-time adjustment according to the variation of transmission range, this can bring very big trouble to operating personnel, and the transmission of video signals distance after amplifying simultaneously is still very limited.The length of video standard signal line increases along with the increase of transmission range, and its weight is also just corresponding to be increased, and when transmission range reached up to a hundred meters, the weight of video standard signal line can reach tens kilograms.Yet do not having ready-made video standard signal line on the market now, needing artificial further "one off" production, thereby the cost of the system integration is increased, and the cycle of finishing lengthening.
Summary of the invention
The object of the present invention is to provide a kind of transmission processing device that is used for the transmission of video signals disposal route and realizes described method, make the long-distance transmissions that can realize vision signal between main frame and the display device, guarantee that simultaneously vision signal is undistorted.
For realizing above-mentioned purpose, the present invention proposes a kind of transmission of video signals disposal route that is used for, comprise video analog signal and synchronous digital signal in the described vision signal, comprise step at transmitting terminal:
(S1) synchronous digital signal is carried out voltage division processing;
(S2) synchronous digital signal of video analog signal after with voltage division processing superposeed send after the difference processing;
Comprise step at receiving end:
(T1) vision signal that receives being carried out the differential signal reduction handles;
(T2) reduction processed video signal is carried out the processing of separating video simulating signal; With the processing that reduction processed video signal is separated synchronous digital signal.
For realizing above-mentioned purpose, the invention allows for a kind of transmission of video signals treating apparatus that is used for, comprising:
Be used for synchronous digital signal is carried out the bleeder circuit of voltage division processing;
Be used for stack difference channel that the synchronous digital signal of video analog signal after with voltage division processing superposeed and send after the difference processing;
Be used for the vision signal that receives is carried out also primary circuit of differential signal that the differential signal reduction handles;
Be used for reduction processed video signal is carried out the video analog signal separation circuit of separating video analog signal processing;
Be used for reduction processed video signal is separated the synchronous digital signal separation circuit that synchronous digital signal is handled.
Implement the present invention, can reach following beneficial effect:
(1) owing to adopt stack differential signal transmission vision signal, avoided vision signal in the long-distance transmissions process because the fixed potential of distorted signals problem that the decay of video analog signal causes and the generation of transmitting-receiving both sides is poor;
(2) can connect simply with the long-distance transmissions of a common netting twine realization vision signal, implementation is strong, saves cost;
(3) circuit structure of realization transmission processing device of the present invention is simple, is easy to realize that used circuit devcie is less, saves cost.
Description of drawings
Fig. 1 is the Video signal processing process that sends in the embodiment;
Fig. 2 is the processing procedure of receiving video signals in the embodiment;
Fig. 3 is the block diagram that sends the Video signal processing device in the embodiment;
Fig. 4 is the block diagram of the treating apparatus of receiving video signals in the embodiment;
Fig. 5 sends drop-down match circuit schematic diagram in the block diagram of Video signal processing device;
Fig. 6 draws the match circuit schematic diagram on sending in the block diagram of Video signal processing device;
Fig. 7 sends shaping circuit schematic diagram in the block diagram of Video signal processing device;
Fig. 8 sends bleeder circuit schematic diagram in the block diagram of Video signal processing device;
Fig. 9 sends stack difference channel schematic diagram in the block diagram of Video signal processing device;
Figure 10 is difference reduction circuit theory diagrams in the block diagram for the treatment of apparatus of receiving video signals;
Figure 11 is a rgb signal separation circuit schematic diagram in the block diagram for the treatment of apparatus of receiving video signals;
Figure 12 is synchronous digital signal separation circuit and the shaping schematic diagram of primary circuit also in the block diagram for the treatment of apparatus of receiving video signals.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is done further and to be elaborated.
In KVM main frame switched system, the video analog signal that comprises in the vision signal of transmitting between each main frame and the display device is a rgb signal, and the synchronous digital signal that comprises is horizontal-drive signal and vertical synchronizing signal.Consider that rgb signal and synchronous digital signal are the signal of one-way transmission, and, find that by observing waveform the video analog signal (rgb signal) in the vision signal staggers mutually with synchronous digital signal (vertical and horizontal-drive signal).That is to say that when rgb signal occurring synchronous digital signal is (the remaining " 0 ") that does not have pulse.Therefore convert differential signal to after the rgb signal in the vision signal and synchronous digital signal can being superposeed and transmit again, again they are separated at receiving end then.Analog and digital signal stack difference and the simple and effective effect that has realized with single common netting twine long-distance transmissions vision signal of analog and digital signal isolation technics have been adopted.
According to above-mentioned principle, below just comprise that with transmission the vision signal of rgb signal and synchronous digital signal is that example describes the present invention program in detail.
Principle of specification part at first, with reference to Fig. 1, in the step 10 at the transmitting terminal of host computer side receiving video signals from the display driver, comprising rgb signal and synchronous digital signal, in the step 11 rgb signal is carried out the processing of drop-down coupling, for follow-up stack difference is prepared, draw the processing of coupling in the step 12 synchronous digital signal being carried out, for follow-up synchronous digital signal shaping processing is prepared, in the step 13 synchronous digital signal that draws matching treatment on the process in the step 12 being carried out shaping handles, again the synchronous digital signal after handling through shaping is carried out voltage division processing in the step 14, make it to meet the requirement of follow-up stack difference processing, the synchronous digital signal that in the step 15 step 11 has been carried out having carried out in the rgb signal of drop-down matching treatment and the step 14 voltage division processing difference processing that superposes, then differentiated vision signal is sent on the CAT.5 cable by the RJ45 interface and transmit, wherein the CAT.5 cable is used to connect the transmitting terminal of host computer side and the receiving end of display device side.
Among Fig. 2, receive the vision signal that the transmitting terminal of host computer side is sent at the receiving end of display device side from the CAT.5 cable, in step 20, at first vision signal is carried out the reduction processing of differential signal, the mixed signal form that vision signal is reverted to form by rgb signal and synchronous digital signal, in step 23, carry out the operation that separation and Extraction goes out rgb signal in the mixed signal of rgb signal and synchronous digital signal composition, then the rgb signal that extracts is sent to display device, in step 21, carry out simultaneously the operation that separation and Extraction goes out synchronous digital signal in the mixed signal of rgb signal and synchronous digital signal composition, and the synchronous digital signal that separates is carried out the shaping reduction handle, also send display device then to, in step 22, two signals that display driver treatment step 21 and 23 in the display device is sent, the form that reverts to image shows.
In conjunction with above-mentioned principle, Fig. 3 and Fig. 4 are the circuit arrangement block diagrams of supporting that described method realizes.Among Fig. 3 at the transmitting terminal of host computer side, comprise the video reception circuit 30 that is used for receiving video signals from the display driver, video reception circuit 30 further is sent to the drop-down match circuit 31 that is used for rgb signal is carried out drop-down matching treatment to rgb signal, simultaneously also synchronous digital signal be sent to be used for synchronous digital signal carried out drawing matching treatment on draw match circuit 32; On draw match circuit 32 again the signal after handling to be passed to be used for synchronous digital signal is carried out the shaping circuit 33 that shaping is handled, shaping circuit 33 is further passed to bleeder circuit 34 to the signal after handling and is carried out voltage division processing, makes it to meet stack difference needs.Drop-down match circuit 31 and bleeder circuit 34 send to the signal after dealing with separately in the stack difference channel 35, carry out the stack difference processing operation of rgb signal and synchronous digital signal, and the differentiated vision signal that superposes can be transferred on the CAT.5 cable.
Among Fig. 4 at the receiving end of display device side, comprise and be used for the vision signal that receives from the CAT.5 cable is reduced also primary circuit 40 of the differential signal handled, differential signal wherein is reduced to the mixed signal form of rgb signal and synchronous digital signal, rgb signal separation circuit 41 separates rgb signal wherein in mixed signal, the synchronous digital signal that while synchronous digital signal separation circuit 42 separates in mixed signal wherein, shaping also primary circuit 43 carry out shaping reduction processing to the synchronous digital signal after separating again; Rgb signal separation circuit 41 and shaping also primary circuit 43 are given display circuit 44 signal conveys after dealing with separately, and the display driver in the display circuit 44 shows the picture intelligence form that the signal Processing that receives becomes can show on display device.
In practical design, can be divided into three groups of difference processing that superpose respectively to rgb signal (comprising RED signal, GREEN signal, BLUE signal) and synchronous digital signal (comprising horizontal-drive signal HSYNC and vertical synchronizing signal VSYNC).The array mode of signal is as follows:
RED signal+vertical synchronizing signal;
GREEN；
BLUE signal+horizontal-drive signal.
Only introduce more detailed protocol of the present invention below with the example that is combined as of RED signal ten vertical synchronizing signals.
Suppose that the walk line impedence of RED signal on mainboard is 75 ohm in the transmitting terminal of host computer side, so, add that one 75 ohm the R3 of pull down resistor over the ground mates for the RED signal at the signal input port place, guarantee the undistorted of RED signal.As shown in Figure 5, and then carry out follow-up stack difference processing.
In Fig. 6, use and draw resistance R 1, R2 to draw matching treatment on vertical synchronizing signal is carried out, make the performance requirement of the follow-up shaping circuit of voltage conforms of vertical synchronizing signal.
Shaping circuit is formed with door 74F08 by two among Fig. 7, wherein when input voltage surpasses 2V, just thinks high level with door 74F08, when input voltage is lower than 0.8V, just thinks low level with door 74F08.Meet following relationship between two and door 74F08 each pin:
3 pin output=1 pin input ﹠amp; The input of 2 pin;
6 pin output=4 pin input ﹠amp; The input of 5 pin.
2 pin and 5 pin because of 74F08 in Fig. 7 all are directly to connect to draw resistance R 6 to 5V, so the bipod input is high level.According to the following formula relation, when the vertical synchronizing signal input was higher than 2V, 6 pin were output as the 5V high level; When the vertical synchronizing signal input was lower than 0.8V, 6 pin were output as the 0V low level.
Because the stack difference channel has requirement to the input of vertical synchronizing signal, require signal input minimum value will be higher than VEE+0.8V, maximal value will be lower than VCC-0.8V (VEE=-5V, here; VCC=+5V, as follows).Therefore, among the design the vertical synchronizing signal after the shaping has been done the electric resistance partial pressure processing, as shown in Figure 8, made resistance R 8 share a part of voltage, made the vertical synchronizing signal of input can meet the requirement of the difference channel that superposes.
In the design, adopt EL2140C difference chip to finish the stack difference processing of RED signal and vertical synchronizing signal as Fig. 9, the VIN pin that inserts EL2140C difference chip among Fig. 5 through the RED signal of drop-down matching treatment, the VINB pin that inserts EL2140C difference chip among Fig. 8 through the vertical synchronizing signal of voltage division processing, VOUT pin and VOUTB pin will be exported one group of differential signal of RED signal and vertical synchronizing signal stack like this.Directly export through a pair of 50 ohm build-out resistor then by the RJ45 interface.
Because vertical synchronizing signal inserts from the VINB pin, according to the output logic formula VOUT=VIN-VINB of difference chip EL2140C, so the difference output end of vertical synchronizing signal is just positive and negative opposite with input end.That is to say, when vertical synchronizing signal be input as+during 1V, its differential ends positive pole is output as-1V.
At the receiving end of display device side, mission critical is exactly separating of RED signal and vertical synchronizing signal.
In this design proposal, we with reference to Figure 10, will deduct a voltage constant with the primary circuit of going back of EL2142C chip as differential signal when considering the back Signal Separation, added the level of a 0.3V on the VREF pin by divider resistance R5, R6.The output logic formula of EL2142C is:
VOUT＝((R2+R1)/R1)*(VIN-VINB+VREF)
Make R2=R1 here, again because when the RED signal occurs, vertical synchronizing signal is 0, so the RED signal of output differential signal the inside just is 2* (original RED signal+VREF), i.e. 2*RED signal+0.6V; And when vertical synchronizing signal occurred, the RED signal should be 0 mutually, so vertical synchronizing signal then is 2* (former vertical synchronizing signal+VREF), a be-2* (former vertical synchronizing signal-0.3V).After the differential signal reduction processing through this circuit, the differential signal of reception just is transformed into the mixed signal form of RED signal and vertical synchronizing signal.
Be the RED demultiplexing circuit as shown in figure 11, mixed signal after Figure 10 reduction is sent to the base stage of triode Q1 after through divider resistance R23 from the left side, as can be seen from the figure, when be input as negative the time [for vertical synchronizing signal negative pulse :-2* (former vertical synchronizing signal-0.3V)], not conducting of triode Q1, the b level point is 0, and c point output level also is 0.When be input as timing (for video analog signal: 2*RED signal+0.6V) because the first-harmonic of a 0.6V is arranged on the RED signal, so triode Q1 is conducting.Fixed pressure drop about 0.6V is arranged between the base stage of triode and the collector, therefore the b voltage of ordering is (2*RED signal+0.6V)-0.6V=2*RED signal, because make divider resistance R24=R26, the c point voltage is 2*RED signal/2=RED signal just so again.Like this, the RED signal has just been separated from mixed signal.
Be circuit as shown in figure 12 to vertical synchronizing signal is separated and shaping is reduced, to separate synchronizing signal, just to separate the negative signal in the mixed signal, and then its shaping is reduced to the digital signal of 0V and 5V according to the high-low level of output.Mixed signal is from the left end input of R37, when mixed signal is timing, just Li Mian vertical synchronizing signal is " 0 ", not conducting of triode Q4, and then a level point is for negative, Q5 is with conducting, so, the b point voltage is low (logical zero), after 74F08 shaping reduction, 3 pins are output as logical zero, promptly are reduced into the digital signal of 0V; When mixed signal when negative, just Li Mian vertical synchronizing signal is " 1 ", Q4 is with conducting, the level that a is ordered is 0, Q5 can conducting, the voltage that b is ordered is high level (logical one), pass through the 74F08 shaping after, be output as logical one, promptly be reduced into the digital signal of 5V.
Just vertical synchronizing signal is also separated from mixed signal through above-mentioned processing, and shaping is reduced into original digital signal form.When all vision signals are all reduced, can directly link to each other with display device and show by Video Graphics Array VGA (Video Graphic Array) interface.
For two other processing procedures that make up the difference processing procedure of GREEN signal and BLUE signal+horizontal-drive signal with above-mentioned RED signal+vertical synchronizing signal, when handling the GREEN signal, because do not have synchronous digital signal in this signal, so the terminal of respective handling synchronous digital signal in all treatment circuits is carried out ground connection, makes it only to handle the GREEN signal.
Above-mentioned situation is meant that all the device of the device of transmitting terminal and receiving end places the outside of main frame and display device respectively, looks concrete condition, also the device of the device of transmitting terminal and receiving end can be placed the inside of main frame and display device respectively.
The above only is a preferred implementation of the present invention.Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1, a kind of transmission of video signals disposal route that is used for comprises video analog signal and synchronous digital signal in the described vision signal, it is characterized in that,
Comprise step at transmitting terminal:
(S1) synchronous digital signal is carried out voltage division processing;
(S2) synchronous digital signal of video analog signal after with voltage division processing superposeed send after the difference processing;
Comprise step at receiving end:
(T1) vision signal that receives being carried out the differential signal reduction handles;
(T2) reduction processed video signal is carried out the processing of separating video simulating signal; With the processing that reduction processed video signal is separated synchronous digital signal.
2, method for transmission processing according to claim 1 is characterized in that, also further comprises the step of video analog signal being carried out drop-down matching treatment before in described step (S2).
3, method for transmission processing according to claim 2 is characterized in that, also further comprises step before in described step (S1):
Draw matching treatment on synchronous digital signal carried out;
To on draw synchronous digital signal after the matching treatment to carry out shaping to handle.
4, method for transmission processing according to claim 3 is characterized in that: also comprise in described step (T2) isolated synchronous digital signal is carried out the step that the shaping reduction is handled.
5, a kind of transmission of video signals treating apparatus that is used for is characterized in that, comprising:
Be used for synchronous digital signal is carried out the bleeder circuit of voltage division processing;
Be used for stack difference channel that the synchronous digital signal of video analog signal after with voltage division processing superposeed and send after the difference processing; With
Be used for the vision signal that receives is carried out also primary circuit of differential signal that the differential signal reduction handles;
Be used for reduction processed video signal is carried out the video analog signal separation circuit of separating video analog signal processing;
Be used for reduction processed video signal is separated the synchronous digital signal separation circuit that synchronous digital signal is handled.
6, transmission processing device according to claim 5 is characterized in that, described device also further comprises the drop-down match circuit that is used for video analog signal is carried out drop-down matching treatment.
7, transmission processing device according to claim 6 is characterized in that, described device also further comprises:
Draw on being used for synchronous digital signal carried out matching treatment on draw match circuit;
Be used on draw the synchronous digital signal after the matching treatment to carry out the shaping circuit that shaping is handled.
8, receiving and processing device according to claim 7 is characterized in that, described device also further comprises and is used for isolated synchronous digital signal is carried out also primary circuit of shaping that shaping reduction handles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101136123A CN1315065C (en) | 2003-11-13 | 2003-11-13 | Transmission processing method and device for video frequency signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101136123A CN1315065C (en) | 2003-11-13 | 2003-11-13 | Transmission processing method and device for video frequency signal |
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| CN1617114A CN1617114A (en) | 2005-05-18 |
| CN1315065C true CN1315065C (en) | 2007-05-09 |
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| CNB2003101136123A Expired - Fee Related CN1315065C (en) | 2003-11-13 | 2003-11-13 | Transmission processing method and device for video frequency signal |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633688A (en) * | 1994-12-19 | 1997-05-27 | Samsung Electronics Co., Ltd. | Image superimposing apparatus for superimposing the encoded color televison signal with the external composite video signal |
| JPH11341495A (en) * | 1998-02-20 | 1999-12-10 | Matsushita Electric Ind Co Ltd | Image decoder |
| JP2000244892A (en) * | 1999-02-22 | 2000-09-08 | Aiphone Co Ltd | Color video transmission device |
| CN1298239A (en) * | 1999-11-17 | 2001-06-06 | 索尼公司 | Information transmission system, information outputting & inputting equipment and connecting relation recognition method |
| WO2002078336A1 (en) * | 2001-03-23 | 2002-10-03 | Matsushita Electric Industrial Co., Ltd. | Data transmitting method, data receiving method, data transmitting device and data receiving device |
-
2003
- 2003-11-13 CN CNB2003101136123A patent/CN1315065C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633688A (en) * | 1994-12-19 | 1997-05-27 | Samsung Electronics Co., Ltd. | Image superimposing apparatus for superimposing the encoded color televison signal with the external composite video signal |
| JPH11341495A (en) * | 1998-02-20 | 1999-12-10 | Matsushita Electric Ind Co Ltd | Image decoder |
| JP2000244892A (en) * | 1999-02-22 | 2000-09-08 | Aiphone Co Ltd | Color video transmission device |
| CN1298239A (en) * | 1999-11-17 | 2001-06-06 | 索尼公司 | Information transmission system, information outputting & inputting equipment and connecting relation recognition method |
| WO2002078336A1 (en) * | 2001-03-23 | 2002-10-03 | Matsushita Electric Industrial Co., Ltd. | Data transmitting method, data receiving method, data transmitting device and data receiving device |
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| CN1617114A (en) | 2005-05-18 |
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