CN102497528B - Double twisted pairs-based monitoring system and method for transmitting and allocating RGBHV - Google Patents
Double twisted pairs-based monitoring system and method for transmitting and allocating RGBHV Download PDFInfo
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Abstract
The invention provides a double twisted pairs-based monitoring system and a method for transmitting and allocating an RGBHV. The system is characterized in that a test image generating circuit is connected to a plurality of difference video driving modules of a double-twisted-pair video array by double twisted pairs, and a video output port of an RGBHV array is connected with display terminals by coaxial cables. The benefits are as follows: the automatic loss and time lag adjusting method and system are adopted, the corresponding dynamic parameter compensation is conducted on a video input port switched at present at the video output port, and other video input ports of the array, which can not be displayed, do not need to be adjusted, so that the equipment number and cost can be reduced.
Description
Technical field
The present invention relates to the transmission distribution technique field of computer video, be particularly related to a kind of computer video (RGBHV (S)) transmission distribution system and method based on twisted-pair feeder, the middle distance video information being applied between multicomputer video front and multidisplay system is shared.
Background technology
Along with improving constantly of social informatization degree, the application demand that need to implement high-quality video monitoring in each field increases greatly, realize large-capacity video information in real time, is effectively transmitted to distribution, thereby reach resource-sharing, for all levels of management personnel and policymaker provides convenience, fast, effectively service, be an urgent demand of current China independent research transmission of video supervisory control system and technology.
Video Baseband Transmission Technology can be divided into following three major types according to the medium of transmission video signal: coaxial cable, optical fiber, twisted-pair feeder.It is more cheap that coaxial cable has price, the technical features such as realization that are easy to, it is all the common method of transmission of video all the time, but exist and need multi-cable transmission of one line video, when input and output are larger, matrix connects complexity, reliability reduction, poor anti jamming capability, shortcoming that loss is large; The transmission of fiber Video signal has transmission bandwidth and greatly, is not subject to the advantages such as external electromagnetic environmental interference, strong security and transmission quality are good compared with wide, capacity, but because optical fiber integrally transmission system price is too high, optical fiber is laid, connection needs Special Equipment, and Installation and Debugging difficulty, the defects such as maintenance cost height, are mainly used in and exceed 1000 meters of above long-distance transmissions.
Many advantages such as Double-strand transmission has that antijamming capability is strong, long transmission distance, wiring are easy, cheap, became main method extensive, middle distance transmission of video in recent years.
Mostly Double-strand transmission equipment is for composite video type in the market, the Double-strand transmission number of devices that is applied to computer video is less, due to the adjacent lines of twisted-pair feeder length difference when making, computer video can be different to the time lag that transmits rear each video component arrival receiving terminal by middle and long distance twisted-pair feeder, causes the color component red, green, blue corresponding to each video component of receiving terminal not overlap; Attenuation degree and the compensating parameter of the vision signal of different transmission ranges are also different, it is smudgy that image becomes, below either way can affect greatly display quality and effect, therefore, in Double-strand transmission process, carry out calibration and compensation and be absolutely necessary.
As shown in Figure 1, the calibration and compensation method that the existing supervisory control system based on twisted-pair feeder is taked is normally set up separately preemphasis circuit on each road of video front of each dispersion, before transmission, the high fdrequency component of amplifying signal, to offset transmitting procedure loss, or is carried out Delay distribution decalage when offsetting each component of transmitting procedure to video component in advance in advance.Twisted-pair feeder computer video matrix only completes passage handoff functionality, because computer video supervisory control system is generally to disperse export structure in input set, and input port quantity M is generally much larger than output port quantity N, cause the supervisory control system of this structure more for equipment dispersion and the quantity of loss balancing and parameter adjustment, the adjustment of parameter is normally dispersed in difference video driving module and manually completes one by one, be difficult to quantification and standardization, must be manipulated by professional, maintenance cost is high.
Summary of the invention
The object of the invention is to propose a kind of Double-strand transmission loss and time lag that automatically compensates fast different length in twisted-pair feeder computer video transmission dispensing applications, a kind of control system and method based on Double-strand transmission Distribution Calculation machine video of carrying out attenuation compensation and time lag correction at the output port of video matrix.
A kind of supervisory control system based on Double-strand transmission Distribution Calculation machine video, comprise that resolution chart generation circuit arrives multiple difference video driving module of twisted-pair feeder computer video matrix via twisted pair line connection, the video output of twisted-pair feeder computer video matrix is connected with each display terminal by coaxial cable.
Described twisted-pair feeder computer video matrix comprises: difference video matrix switch module, difference/single-ended change-over circuit, microcontroller, loss parameter acquisition circuit, Delay Parameters Acquisition Circuit, attenuation compensation and time lag correcting circuit and Parameter storage circuit.Microcontroller sends channel selecting order to difference video matrix switch module, and difference video matrix switch module should be ordered corresponding video input port is switched to video-out port mutually; Difference/single-ended change-over circuit receives the output of difference video matrix switch module, and Difference Calculation machine video is converted to single-ended computer video output; Attenuation compensation circuit and time lag correcting circuit receive single-ended computer video output and compensate and proofread and correct according to the parameter adjustment order of microcontroller; Under normal mode of operation, attenuation compensation circuit and time lag correcting circuit are directly exported color component, and under parameter measurement pattern, the output of the color component of attenuation compensation circuit and time lag correcting circuit is connected respectively to loss parameter acquisition circuit and Delay Parameters Acquisition Circuit; Loss parameter acquisition circuit gathers the color parameter characteristic of color component, and the Delay Parameters characteristic that Delay Parameters Acquisition Circuit gathers color component outputs to microcontroller; Under normal mode of operation, when the order of microcontroller reception external communication interface completes passage switching, read the corresponding parameter of Parameter storage circuit output parameter adjustment order to attenuation compensation circuit and time lag correcting circuit, under parameter measurement pattern the color parameter characteristic of microcontroller receive loss parameter acquisition circuit output and the Delay Parameters characteristic of Delay Parameters Acquisition Circuit output and by the Parameter storage the most consistent with the parameter characteristic of known resolution chart to Parameter storage circuit.
Described difference video driving module comprises: resolution chart produces circuit, the conversion of digital circuit/vision signal, normal/test mode diverter switch and single-ended/difference video switch circuit.Resolution chart produces the resolution chart of circuit output TTL form to digital circuit/vision signal change-over circuit, and the resolution chart of the TTL form of input is converted to video format by digital circuit/vision signal change-over circuit; Two inputs of normally/test mode diverter switch are respectively digital circuit/vision signal change-over circuit and signal source output computer video, under normal mode of operation, normally/test mode diverter switch receives signal source output computer video, and under parameter measurement pattern, normal/test mode diverter switch receives the output of digital circuit/vision signal change-over circuit; The output of normally/test mode diverter switch is connected to single-ended/difference video switch circuit; RGBHV video is converted to the output of difference video by single-ended/difference video switch circuit;
As shown in Figure 2, a kind of supervisory control system and method based on Double-strand transmission Distribution Calculation machine video, only input video port corresponding to video-out port carried out to dynamic attenuation parametric compensation and time lag correction, and other to be switched video input ports that do not show of Input matrix end are not adjusted, reduce number of devices and cost; The method of dynamic parameter compensation is to transfer the compensating parameter that input port is corresponding to be applied to compensation and time lag correcting circuit, and in the time that input corresponding to output video port changes, the compensating parameter of transferring also dynamically changes.Because the present invention is at the output centralized compensation of matrix, maintenance cost and debugging difficulty are reduced; In addition, the present invention propose by front end difference video driving module produce after resolution chart transmission matrix video-out port gather graphic parameter and with known signal Character Comparison, realize the method for measuring fast, accurately of Double-strand transmission loss and time lag compensation parameter, without artificial adjustment, calibration efficiency and accuracy are improved.
In native system, there are two kinds of mode of operations: the first is parameter measurement pattern, only in the time of system buildup initialization and periodic maintenance, move.Under this mode of operation, difference video driving module produces resolution chart as the resolution chart of accompanying drawing 3, and is converted to differential signal transmission.In resolution chart, comprised for 100 nanoseconds, 1000 nanoseconds, 10 microseconds increase progressively until the rectangle calibrating signal of 100 milliseconds, these signals can represent in vision signal the characteristic of various frequency components from high to low preferably, twisted-pair feeder computer video matrix carries out difference/single-ended conversion completing after video switch, the each video input port of acquisition matrix is through the resolution chart signal of different length cable transmission, automatic and resolution chart known features contrasts, analyze transmission front whether consistent with the characteristics of signals after transmission, in the time that both are inconsistent, stepping increases the accurate compensating parameter of corresponding input channel, comprise gain, peak value, the characteristic compensations such as skew and time lag, until both characteristics are in full accord or basically identical, and compensating parameter is now deposited in to the Parameter storage circuit being formed by nonvolatile storage.
The second mode of operation is normal mode of operation.Computer video has after by Double-strand transmission two kinds of parameters to need to adjust: (1) various information source is inconsistent to the cable length of matrix, causes the parametric compensation difference to some extent such as gain, peak value, skew of each road video input port; (2) when same signal source vision signal can cause showing to the inconsistent time delay difference that causes each color component video to arrive receiving port of length due to twisted-pair cable, red, green, blue three looks do not overlap.For above two kinds of adjustment demands, the output port of the present invention after matrix switches is provided with attenuation compensation and time lag correcting circuit, when the different input video ports of upper computer selecting are switched to output video port, adjustment parameter control attenuation compensation and time lag correcting circuit that microcontroller dynamic call is corresponding to this input video port, complete multiple parameter adjustments such as gain, DC level, peak value and time lag.Because these parameters are optimal parameters of obtaining in advance under parameter measurement pattern, and resolution chart transmission the cable passage of process during with mode of operation normal video signal the cable passage of process identical, its decay is also identical with time lag characteristic, the characteristic that these parameters are used for adjusting normal video signal is also suitable for completely, therefore can within the time of tens of milliseconds, make fast vision signal reach predetermined characteristic.
Described parameter measurement pattern and normal mode of operation; When system buildup and initialization, be operated in parameter measurement pattern, comprise that step is as follows:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix are all switched to test mode;
Step 102: as shown in Figure 6, the resolution chart of difference video driving module produces circuit (601) and produces resolution chart as shown in Figure 3, comprises the pulse train from 100ns to 100ms width, represents in vision signal various frequency components from high to low; Resolution chart is converted to resolution chart vision signal through digital circuit/vision signal conversion (602), is converted to the output of difference video finally by normal/test mode diverter switch (603) and single-ended/difference video conversion circuit (604);
Step 103: as shown in Figure 4, under the control of microcontroller (403), first via video input port is switched to first via video-out port by the difference video matrix switch module (401) of twisted-pair visual frequency matrix switch;
Step 104: Difference Calculation machine video is converted to color component (RGB) and synchronized component output (HV(S) by difference/single-ended change-over circuit (402)) output, now attenuation compensation parameter and time lag correction parameter (406) are all set to 0;
Step 105: color component outputs to loss parameter acquisition circuit (404), loss parameter acquisition circuit (404) gathers the vision signal after transmission;
Step 106: microcontroller (403) reads output current color parameter, and contrast with the resolution chart analysis of Fig. 3, if current characteristic is different from resolution chart, stepping increases attenuation compensation parameter;
Step 107: repeating step 104 is to step 106, until the characteristic of the color parameter that microcontroller (403) reads and resolution chart is consistent or error reaches specified scope, just deposits this parameter in input parameter district, Parameter storage circuit (407) Gai road;
Step 108: microcontroller (403) reads the Delay Parameters of Delay Parameters Acquisition Circuit (405) output, and calculate the corresponding time lag compensation parameter of each color component according to the characteristics of signals of resolution chart, and deposit this parameter in Parameter storage circuit (407) Gai road input parameter district;
Step 109: under the control of microcontroller (403), difference video matrix switch module (401) successively by the second road until M road video input port is switched to first via video-out port, repeating step 104, to step 108, obtains attenuation compensation parameter and the time lag correction parameter of all video input ports and is stored in Parameter storage circuit (407).
During except system buildup and initialization, system is all operated in normal mode of operation, comprises that step is as follows:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix are all switched to matrix operating state.As shown in Figure 6, signal source outputs to computer video by normal/test mode diverter switch (603) output, is converted to the output of difference video through single-ended/difference video conversion circuit (604);
Step 202: as shown in Figure 5, microcontroller (503) is to the rear sendaisle control command of outside switching command decoding to video matrix switch module (501), and desired channel command video input port is switched to desired video-out port by video matrix switch module (501);
Step 203: the difference video signal of differential received and attenuation compensation module (502) receiver, video matrix switch module (501) output;
Step 204: microcontroller (503) reads the attenuation compensation parameter control figure potentiometer (505) that this road video input port of Parameter storage circuit (507) is corresponding, digital regulation resistance (505) converts input digital quantity to analog output to differential received and attenuation compensation module (502);
Step 205: differential received and attenuation compensation module (502) complete gain, peak value, the migration to vision signal according to the decay control of digital regulation resistance (505) output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line (504);
Step 206: microcontroller (503) reads the Delay Parameters control programmable analog video delay line (504) that this road video input port of Parameter storage circuit (507) is corresponding, makes each color component overlap because time lag reaches unanimously;
Step 207: repeating step 201 makes the video input port performance that each road output signal is switched reach predetermined characteristic to step 206.
The beneficial effect of patent of the present invention is, (1) adopt the automatic loss of this patent proposition and the method and system that time lag is adjusted, only at video-out port, the current video input port being switched is carried out to corresponding dynamic parameter compensation, and other to be switched video input ports that do not show of matrix are without adjusting, number of devices and cost are reduced; (2) by front end difference video driving module produce after resolution chart transmission matrix output port gather graphic parameter and with known signal Character Comparison, microcontroller is analyzed the criterion as the control of flush bonding processor signal feedback to gathering content, thereby realize the method for measuring fast, accurately of Double-strand transmission loss and time lag compensation parameter, realize quantification and the standardization of calibration steps, solved that the efficiency that manual adjustment method exists is low, low precision and the large problem of subjective factor, improved calibration efficiency and accuracy.
Brief description of the drawings
Fig. 1 is the system block diagram of twisted-pair cable video transmission of the present invention.
Fig. 2 is the system block diagram of twisted-pair cable video transmission of the present invention.
Fig. 3 is the oscillogram of resolution chart of the present invention.
Fig. 4 is the matrix composition diagram of twisted-pair visual frequency of the present invention.
Fig. 5 is twisted-pair visual frequency matrix embodiment of the present invention (matrix switches and parametric compensation part).
Fig. 6 is difference video driving module embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme of patent of the present invention is described.
As shown in Figure 2, difference video driving module, except difference/single-ended change-over circuit, also produces the electric circuit constitute by resolution chart to system block diagram of the present invention, not containing the preemphasis circuit shown in accompanying drawing 1.Difference video driving module is that differential signal rear drive is to twisted pair wire by computer video signal code conversion, attenuation compensation and time lag correcting circuit are arranged on the output port of video matrix, only the current video input port being switched are carried out to loss and time lag compensation.
The flow process of parameter measurement pattern is as follows:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix are all switched to test mode;
Step 102: as shown in Figure 6, the resolution chart of difference video driving module produces circuit (601) and produces resolution chart as shown in Figure 3, comprises the pulse train from 100ns to 100ms width, represents in vision signal various frequency components from high to low; Resolution chart is converted to resolution chart vision signal through digital circuit/vision signal conversion (602), is converted to the output of difference video finally by normal/test mode diverter switch (603) and single-ended/difference video conversion circuit (604);
Step 103: as shown in Figure 4, under the control of microcontroller (403), first via video input port is switched to first via video-out port by the difference video matrix switch module (401) of twisted-pair visual frequency matrix switch;
Step 104: Difference Calculation machine video is converted to color component (RGB) and synchronized component output (HV(S) by difference/single-ended change-over circuit (402)) output, now attenuation compensation parameter and time lag correction parameter (406) are all set to 0;
Step 105: color component outputs to loss parameter acquisition circuit (404), loss parameter acquisition circuit (404) gathers the vision signal after transmission;
Step 106: microcontroller (403) reads output current color parameter, and contrast with the resolution chart analysis of Fig. 3, if current characteristic is different from resolution chart, stepping increases attenuation compensation parameter;
Step 107: repeating step 104 is to step 106, until the characteristic of the color parameter that microcontroller (403) reads and resolution chart is consistent or error reaches specified scope, just deposits this parameter in input parameter district, Parameter storage circuit (407) Gai road;
Step 108: microcontroller (403) reads the Delay Parameters of Delay Parameters Acquisition Circuit (405) output, and calculate the corresponding time lag compensation parameter of each color component according to the characteristics of signals of resolution chart, and deposit this parameter in Parameter storage circuit (407) Gai road input parameter district;
Step 109: under the control of microcontroller (403), difference video matrix switch module (401) successively by the second road until M road video input port is switched to first via video-out port, repeating step 104, to step 108, obtains attenuation compensation parameter and the time lag correction parameter of all video input ports and is stored in Parameter storage circuit (407).
The flow process of matrix mode of operation is as follows:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix are all switched to matrix operating state.As shown in Figure 6, signal source outputs to computer video by normal/test mode diverter switch (603) output, is converted to the output of difference video through single-ended/difference video conversion circuit (604);
Step 202: as shown in Figure 5, microcontroller (503) is to the rear sendaisle control command of outside switching command decoding to video matrix switch module (501), and desired channel command video input port is switched to desired video-out port by video matrix switch module (501);
Step 203: the difference video signal of differential received and attenuation compensation module (502) receiver, video matrix switch module (501) output;
Step 204: microcontroller (503) reads the attenuation compensation parameter control figure potentiometer (505) that this road video input port of Parameter storage circuit (507) is corresponding, digital regulation resistance (505) converts input digital quantity to analog output to differential received and attenuation compensation module (502);
Step 205: differential received and attenuation compensation module (502) complete gain, peak value, the migration to vision signal according to the decay control of digital regulation resistance (505) output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line (504);
Step 206: microcontroller (503) reads the Delay Parameters control programmable analog video delay line (504) that this road video input port of Parameter storage circuit (507) is corresponding, makes each color component overlap because time lag reaches unanimously;
Step 207: repeating step 201 makes the video input port performance that each road output signal is switched reach predetermined characteristic to step 206.
Claims (2)
1. the supervisory control system based on Double-strand transmission Distribution Calculation machine video, is characterized in that:
Supervisory control system comprises: difference video driving module, twisted-pair feeder computer video matrix and display terminal composition, and difference video driving module is the video input port to twisted-pair feeder computer video matrix via twisted pair line connection; The video output of twisted-pair feeder computer video matrix is connected with each display terminal by coaxial cable;
Described twisted-pair feeder computer video matrix comprises: difference video matrix switch module, difference/single-ended change-over circuit, microcontroller, loss parameter acquisition circuit, Delay Parameters Acquisition Circuit, attenuation compensation and time lag correcting circuit and Parameter storage circuit;
Described difference video driving module comprises: resolution chart produces circuit, the conversion of digital circuit/vision signal, normal/test mode diverter switch and single-ended/difference video switch circuit;
The monitoring implementation method of this described supervisory control system, is arranged on video-out port by attenuation parameter compensation and time lag correcting circuit, only input video port corresponding to video-out port is compensated and is proofreaied and correct; By when system buildup and the initialization, after the resolution chart transmission being produced by front end difference video driving module matrix video-out port gather graphic parameter and with known signal Character Comparison, realize the measurement fast, accurately of Double-strand transmission loss and time lag compensation parameter; The compensating parameter of transferring Parameter storage circuit input end mouth correspondence in the time of normal mode of operation is applied to compensation and time lag correcting circuit, and in the time that input corresponding to output video port changes, the compensating parameter of transferring also dynamically changes.
2. a kind of supervisory control system based on Double-strand transmission Distribution Calculation machine video according to claim 1, is characterized in that: comprise parameter measurement pattern and normal mode of operation; When system buildup and initialization, be operated in parameter measurement pattern, comprise that step is as follows:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix are all switched to test mode;
Step 102: the resolution chart of difference video driving module produces circuit and produces resolution chart, comprises the pulse train from 100ns to 100ms width, represents in vision signal various frequency components from high to low; Resolution chart is converted to resolution chart vision signal through digital circuit/vision signal, is converted to the output of difference video finally by normal/test mode diverter switch and single-ended/difference video conversion circuit;
Step 103: under the control of microcontroller, first via video input port is switched to first via video-out port by the difference video matrix switch module of twisted-pair visual frequency matrix switch;
Step 104: Difference Calculation machine video is converted to color component (RGB) and synchronized component output (HV(S) by difference/single-ended change-over circuit) output, now attenuation compensation parameter and time lag correction parameter are all set to 0;
Step 105: color component outputs to loss parameter acquisition circuit, loss parameter acquisition circuit gathers the vision signal after transmission;
Step 106: microcontroller reads output current color parameter, and contrast with original resolution chart analysis, if current characteristic is different from resolution chart, stepping increases attenuation compensation parameter;
Step 107: repeating step 104 is to step 106, until the characteristic of the color parameter that microcontroller reads and resolution chart is consistent or error reaches specified scope, just deposits this parameter in input parameter district, Parameter storage circuit Gai road;
Step 108: microcontroller reads the Delay Parameters of Delay Parameters Acquisition Circuit output, and calculates the corresponding time lag compensation parameter of each color component according to the characteristics of signals of resolution chart, and deposits this parameter in Parameter storage circuit Gai road input parameter district;
Step 109: under the control of microcontroller, difference video matrix switch module successively by the second road until M road video input port is switched to first via video-out port, repeating step 104, to step 108, obtains attenuation compensation parameter and the time lag correction parameter of all video input ports and is stored in Parameter storage circuit; During except system buildup and initialization, system is all operated in normal mode of operation, comprises that step is as follows:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix are all switched to matrix operating state;
As shown in Figure 6, signal source outputs to computer video by normal/test mode diverter switch output, is converted to the output of difference video through single-ended/difference video conversion circuit;
Step 202: as shown in Figure 5, microcontroller is to the rear sendaisle control command of outside switching command decoding to video matrix switch module, and desired channel command video input port is switched to desired video-out port by video matrix switch module;
Step 203: the difference video signal of differential received and the output of attenuation compensation module receiver, video matrix switch module;
Step 204: microcontroller reads the attenuation compensation parameter control figure potentiometer that this road video input port of Parameter storage circuit is corresponding, digital regulation resistance converts input digital quantity to analog output to differential received and attenuation compensation module;
Step 205: differential received and attenuation compensation module complete gain, peak value, the migration to vision signal according to the decay control of digital regulation resistance output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line;
Step 206: microcontroller reads the Delay Parameters control programmable analog video delay line that this road video input port of Parameter storage circuit is corresponding, and each color component is overlapped because time lag reaches unanimously;
Step 207: repeating step 201 makes the video input port performance that each road output signal is switched reach predetermined characteristic to step 206.
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| CN102780912B (en) * | 2012-07-30 | 2015-02-11 | 中国船舶重工集团公司第七0九研究所 | Test method of radar video transmission channel |
| CN103139548A (en) * | 2013-03-19 | 2013-06-05 | 株洲南车时代电气股份有限公司 | Locomotive vehicle-mounted video monitoring system |
| CN104125425B (en) * | 2014-07-31 | 2018-01-12 | 深圳市天威视讯股份有限公司 | A kind of coaxial electric cable network performance prediction method |
| CN105915848B (en) * | 2016-05-06 | 2019-01-11 | 浙江宇视科技有限公司 | Monitoring display screen, display and control terminal, interface conversion equipment and video wall group network system |
| CN108566522A (en) * | 2018-03-28 | 2018-09-21 | 中国船舶重工集团公司第七0九研究所 | A kind of multi-channel video director system and method |
| CN114245004B (en) * | 2021-11-29 | 2023-06-23 | 浙江大华技术股份有限公司 | Image compensation method, system, hard disk video recorder and readable storage medium |
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