CN108471512B - High-definition video dual-link hot standby transmission equipment - Google Patents
High-definition video dual-link hot standby transmission equipment Download PDFInfo
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- CN108471512B CN108471512B CN201810122232.2A CN201810122232A CN108471512B CN 108471512 B CN108471512 B CN 108471512B CN 201810122232 A CN201810122232 A CN 201810122232A CN 108471512 B CN108471512 B CN 108471512B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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Abstract
The invention provides high-definition video dual-link hot standby transmission equipment which comprises a transmitter and a receiver which are connected with each other. The transmitter comprises a power supply conversion module, an input module, an output module, an EDID module and a control unit; the receiver comprises a receiver power conversion module, a double-link receiving module, a DVI output module and a receiver control unit; the invention combines the advantages of twisted pair and optical fiber transmission, the twisted pair has strong survivability, the confidentiality of optical fiber transmission is good, the hidden trouble of electromagnetic leakage is avoided, and the transmission distance is long; the video signals transmitted by the optical fiber link and the twisted pair link are lossless high-definition video signals, so that the consistency of display pictures is ensured.
Description
Technical Field
The invention relates to the field of video transmission, in particular to high-definition video dual-link hot standby transmission equipment.
Background
At present, in the design and construction of a conference-level audio-video system, a twisted pair cable or an optical fiber is often adopted between a transmitter and a receiver to transmit high-definition video. Commercial equipment adopting the twisted-pair line to transmit high-definition videos utilizes the characteristics of cheap twisted-pair lines, wide use and strong survivability, and uses cat5e or cat6 twisted-pair lines as transmission media, so that the distance for transmitting the high-definition videos can reach 100 meters; the commercial equipment for transmitting the high-definition video by adopting the optical fiber utilizes the characteristics of small electromagnetic radiation, good confidentiality and long transmission distance of the optical fiber, uses multimode or single-mode optical fiber as a transmission medium, and has the distance of transmitting the high-definition video up to more than 300 meters.
In the market, double-link high-definition video transmission equipment is available, for example, two single-mode single-core optical fibers are used for connection between a transmitter and a receiver, and the transmission of high-definition video is not influenced when any optical fiber is damaged. However, the optical fiber medium is made of glass or plastic, and has poor shock resistance and destruction resistance. Only optical fibers are used as a medium for wired transmission of high-definition video signals, so that the high requirements of conference centers and command control centers on survivability are difficult to meet.
In the market, a device for transmitting high-definition video by double links is also available, and combines optical fiber transmission and an IP coding and decoding technology, and an optical fiber and a twisted pair are adopted for connection between a transmitter and a receiver, wherein the twisted pair connection can pass through a plurality of switches, and the transmission distance is longer. It appears that such a device combines the features of optical fiber transmission and twisted pair transmission. However, the signal transmitted by the device on the twisted-pair link is a compressed and encoded IP data packet, and the high-definition video picture output after decoding and decompressing at the receiving end has an obvious image quality difference compared with the lossless non-compressed high-definition video transmitted by the optical fiber link, which destroys the picture consistency of video display. In addition, because the IP codec technology is used on the twisted pair link, the delay of transmitting high definition video is large, and during the switching process of the hot standby link, the phenomena of bright display, flashing and black screen appear on the display device connected to the receiver.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing high-definition video dual-link hot standby transmission equipment aiming at the defects of the prior art.
In order to solve the technical problem, the invention provides a high-definition video dual-link hot standby transmission device which comprises a transmitter and a receiver which are connected with each other.
In the invention, the transmitter comprises a power supply conversion module, an input module, an output module, an EDID module and a control unit;
the power supply conversion module comprises an alternating current power supply input interface, a power supply switch, an AC-DC unit and a DC-DC unit;
the input module comprises a DVI input interface, a DVI input unit and a DVI distribution unit, wherein the DVI input interface is a DVI-I female seat, receives DVI signals, and divides the input DVI signals into three paths after passing through the DVI input unit and the DVI distribution unit;
the output module includes DVI output unit, DVI ring-out interface, electricity/light conversion and processing unit, LC fiber interface, HDBaseT transmitting circuit and RJ45 mouth, and DVI distribution unit divides the DVI signal of input into three routes: the first path is output from a DVI ring-out interface after passing through a DVI output unit, the DVI ring-out interface is a DVI-I female seat, and DVI signals are output and used for being connected with a monitoring video source of local display equipment; the second path is changed into an optical signal through an electric/optical conversion and processing unit and is output from the LC optical fiber interface; the third path is output from an RJ45 port through an HDBaseT transmitting circuit, and signals output from an LC optical fiber interface and an RJ45 port respectively pass through an optical fiber and a twisted pair to form a transmitting end of the high-definition video double-link hot standby transmission;
the EDID module comprises an EDID control interface, an EDID management unit and an EDID storage chip, and is controlled by the control unit to change EDID information stored in the EDID storage chip;
the control unit comprises a processor and an EDID reading button, the processor is communicated with the EDID management unit through an EDID control interface, when the transmitter is electrified to normally work, the local display device is connected with the DVI ring-out interface, the EDID reading button is pressed down, the processor controls the EDID management unit to read EDID information in the local display device connected with the DVI ring-out interface, the EDID information is stored in an EDID storage chip, the whole process is completed in about 2 seconds, the EDID storage chip is a nonvolatile memory, the EDID information can be still kept after power failure, when the transmitter is normally used, a video source connected with the DVI input interface reads the EDID information in the EDID storage chip through the EDID management unit, and the transmitted video format is correct.
In the invention, the receiver comprises a receiver power conversion module, a double-link receiving module, a DVI output module and a receiver control unit;
the receiver power conversion unit comprises an alternating current power input interface, a power switch, an AC-DC unit and a DC-DC unit, and converts 220V alternating current into direct current voltage required by the receiver to work;
the double-link receiving module comprises an LC optical fiber interface, an optical/electrical conversion and processing unit, an RJ45 port, an HDBaseT receiving circuit, a signal detection circuit 1 and a signal detection circuit 2, wherein the optical/electrical conversion and processing unit converts optical signals received from the single-mode optical fiber into DVI signals through the LC optical fiber interface, the HDBaseT receiving circuit converts the signals received from the twisted pair into the DVI signals through the RJ45 port, and the DVI signals converted from the optical/electrical conversion and processing unit and the HDBaseT receiving circuit are respectively sent to the DVI output module after passing through the signal detection circuit 1 and the signal detection circuit 2;
the DVI output module comprises a DVI selection unit, a seamless switching unit, a DVI output unit and a DVI output interface, the DVI selection unit selects DVI signals output by the signal detection circuit 1 and the signal detection circuit 2 and sends the DVI signals to the seamless switching unit, the seamless switching unit adopts a buffer frame method to carry out seamless processing on the DVI signals so as to ensure the integrity of a display picture when switching to another link after the signals of a certain link are lost, and the DVI signals which are subjected to the seamless processing are sent to a far-end display device from the DVI output interface through the DVI output unit;
the control unit of the receiver includes processor and RS-232 interface, the processor receives the instruction signal of DVI signal that the real-time signal detection circuit 1 and signal detection circuit 2 send, DVI signal of which one way of selection of control DVI selector unit, when the DVI signal that the signal detection circuit 1 detects the light/electricity and output of the processing unit, and the DVI signal that the signal detection circuit 2 does not detect HDBaseT receiving circuit and output, the DVI signal that the signal detection circuit 1 outputs of processor control DVI selector unit; when the signal detection circuit 1 does not detect the DVI signal output by the optical/electrical conversion and processing unit and the signal detection circuit 2 detects the DVI signal output by the HDBaesT receiving circuit, the processor controls the DVI signal output by the DVI selection unit selection signal detection circuit 2; when the DVI signal is detected by both the signal detection circuit 1 and the signal detection circuit 2, the processor controls the DVI selection unit to select the signal according to the setting of the priority.
The transmitter comprises a transmitter front panel, and the transmitter front panel is provided with a DVI input interface, an EDID reading button, a DVI ring-out interface, an alternating current power input interface and a power switch.
In the invention, the transmitter comprises a transmitter rear panel, and an LC optical fiber interface and an RJ45 port are arranged on the transmitter rear panel.
In the invention, the receiver comprises a receiver front panel, and an LC optical fiber interface, an RJ45 port, a DVI output interface and an RS-232 interface are arranged on the receiver front panel.
In the invention, the receiver comprises a receiver rear panel, and an alternating current power supply input interface and a power supply switch are arranged on the receiver rear panel.
In the present invention, the receiver and the transmitter are connected by a single mode optical fiber.
In the present invention, the receiver and the transmitter are connected by a twisted pair.
In the present invention, the receiver and the transmitter are connected by a matrix.
1. The invention combines the advantages of twisted pair and optical fiber transmission, the twisted pair has strong survivability, the confidentiality of optical fiber transmission is good, the hidden trouble of electromagnetic leakage is avoided, and the transmission distance is long;
2. video signals transmitted by the optical fiber link and the twisted pair link are lossless high-definition video signals, so that the consistency of displayed pictures is ensured;
3. the receiver can be set to preferentially receive signals from the optical fiber link or the twisted pair link through the serial port;
4. the receiver has the function of automatically detecting link signals, when the receiver is matched with the transmitter for use, when a certain link fails, the receiver is automatically and seamlessly switched to another link, a viewer cannot detect the failure, and the reliability of a high-definition video transmission system can be obviously improved;
5. the transmission equipment is simple to operate and use and convenient to maintain. The transmitter and the receiver can be connected by a direct single link, a double link, through matrix switching, etc., and have various use modes.
Drawings
The foregoing and other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a block diagram of a transmitter and a receiver of the present invention.
Fig. 2 and 3 are schematic diagrams of a front panel and a rear panel, respectively, of a transmitter of the present invention.
Fig. 4a and 4b are schematic views of a front and rear panel, respectively, of a receiver of the present invention.
Fig. 5a and 5b are schematic diagrams of the transmitter structure of the present invention.
Fig. 6a and 6b are schematic diagrams of the receiver structure of the present invention.
Fig. 7a is a connection diagram of an application example of the present invention.
FIG. 7b is a second schematic diagram of an exemplary embodiment of the present invention.
Fig. 7c is a third schematic connection diagram of an application example of the present invention.
Fig. 7d is a connection diagram of an application example of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The high-definition video double-link hot standby transmission equipment comprises a transmitter 1 and a receiver 2, wherein both the transmitter 1 and the receiver 2 are box-type equipment and are arranged in a workbench or a cabinet.
As shown in fig. 1, the transmitter 1 includes a power conversion module, an input module, an output module, an EDID module, and a control unit. The power supply conversion module comprises an alternating current power supply input interface 1-1, a power switch 1-2, an AC-DC unit 1-3 and a DC-DC unit 1-4, and converts 220V alternating current into direct current required by other circuits in the transmitter.
The input module comprises DVI input interfaces 1-12, DVI input units 1-13 and DVI distribution units 1-14, the DVI input interfaces 1-12 are DVI-I female seats, DVI signals are received, and the input DVI signals are divided into three paths after passing through the DVI input units 1-13 and the DVI distribution units 1-14.
The output module comprises DVI output units 1-11, DVI ring-out interfaces 1-10, electric/optical conversion and processing units 1-15, LC optical fiber interfaces 1-16, HDBaseT transmitting circuits 1-17, and RJ45 ports 1-18. The DVI distribution units 1-14 divide the input DVI signal into three paths: one path of DVI is output from a DVI ring-out interface 1-10 after passing through a DVI output unit 1-11, the DVI ring-out interface 1-10 is a DVI-I female seat, and DVI signals are output and used for being connected with a monitoring video source of local display equipment; one path of the optical signal is converted into an optical signal through the electric/optical conversion and processing unit 1-15 and is output from the LC optical fiber interface 1-16; one path is output from RJ45 ports 1-18 through HDBaseT transmitting circuits 1-17. Signals output from the LC optical fiber interfaces 1-16 and the RJ45 ports 1-18 form a sending end of the double-link hot standby transmission of the high-definition video through the optical fiber and the twisted pair respectively. The HDBaseT transmission circuits 1 to 17 are chip circuits manufactured following the standards set by the HDBaseT consortium.
The EDID module comprises EDID control interfaces 1-7, EDID management units 1-6 and EDID storage chips 1-9. The EDID module is used for changing EDID information stored in the EDID storage chips 1-9 under the control of the control unit. EDID is extenseddisplay Identification Data (extended display Identification Data).
The control unit includes a processor 1-8 and an EDID read button 1-5. The processors 1-8 adopt ATMEGA162 model in the application, and the processors 1-8 communicate with the EDID management units 1-6 through EDID control interfaces 1-7. When the transmitter is powered on and normally works, the local display device is connected with the DVI ring-out interface 1-10, the EDID reading button 1-5 is pressed, the processor 1-8 controls the EDID management unit 1-6 to read EDID information in the local display device connected with the DVI ring-out interface 1-10 and store the EDID information into the EDID storage chip 1-9, and the whole process is completed in about 2 seconds. The EDID memory chips 1-9 are nonvolatile memories, and can still maintain EDID information after power failure. When the video source is normally used, the video source connected with the DVI input interface 1-12 reads the EDID information in the EDID storage chip 1-9 through the EDID management unit 1-6 to ensure that the transmitted video format is correct.
The receiver 2 comprises a power conversion module, a double-link receiving module, a DVI output module and a control unit. The power conversion unit comprises an alternating current power input interface 2-13, a power switch 2-14, an AC-DC unit 2-15 and a DC-DC unit 2-16, and converts 220V alternating current into direct current voltage required by the operation of other circuits of the receiver.
The double-link receiving module comprises an LC optical fiber interface 2-1, an optical/electrical conversion and processing unit 2-3, an RJ45 port 2-2, an HDBaseT receiving circuit 2-4, a signal detection circuit 12-5 and a signal detection circuit 22-6. The optical/electrical conversion and processing unit 2-3 converts the optical signal received from the single mode fiber into a DVI signal through the LC fiber interface 2-1. The HDBaseT receiving circuit 2-4 converts the signal received from the twisted pair into a DVI signal through the RJ45 port 2-2. DVI signals converted from the optical/electrical conversion and processing unit 2-3 and the HDBaseT receiving circuit 2-4 are respectively transmitted to the DVI output module after passing through the signal detection circuit 12-5 and the signal detection circuit 22-6.
The DVI output module comprises 2-8 DVI selection units, 2-9 seamless switching units, 2-10 DVI output units and 2-11 DVI output interfaces. The DVI selection unit 2-8 selects DVI signals output by the signal detection circuit 12-5 and the signal detection circuit 22-6 and sends the DVI signals to the seamless switching unit 2-9. The seamless switching unit 2-9 adopts the method of buffering the frame to process DVI signal seamlessly, in order to guarantee after some link signal loss, display the integrality of the picture while switching to another link, DVI signal after seamless processing is sent to the far-end display equipment from DVI output interface 2-11 via DVI output unit 2-10.
The control unit comprises a processor 2-7 and an RS-232 interface 2-12. The processor 2-7 receives the indication signals of the DVI signals from the signal detection circuit 12-5 and the signal detection circuit 22-6 in real time, thereby controlling the DVI selection unit 2-8 to select which path of DVI signals. When the signal detection circuit 12-5 detects the DVI signal output by the optical/electrical conversion and processing unit 2-3 and the signal detection circuit 22-6 does not detect the DVI signal output by the HDBaseT receiving circuit 2-4, the processor 2-7 controls the DVI selection unit 2-8 to select the DVI signal output by the signal detection circuit 12-5; when the signal detection circuit 12-5 does not detect the DVI signal output by the optical/electrical conversion and processing unit 2-3 and the signal detection circuit 22-6 detects the DVI signal output by the HDBaesT receiving circuit 2-4, the processor controls the DVI selection unit 2-8 to select the DVI signal output by the signal detection circuit 22-6; when the DVI signal is detected by both the signal detection circuit 12-5 and the signal detection circuit 22-6, the processor 2-7 controls the DVI selection unit 2-8 to select a signal, such as the signal output by the priority selection signal detection circuit 12-5 or the signal output by the priority selection signal detection circuit 22-6, according to the setting of the priority. The setting of the priority can be changed by sending an instruction to the processor 2-7 via the RS-232 interface 2-12.
Fig. 2 is a schematic diagram of a front panel of a transmitter of the present invention. The front panel of the transmitter is provided with DVI input interfaces 1-12, EDID reading buttons 1-5, DVI ring-out interfaces 1-10, an alternating current power input interface 1-1 and a power switch 1-2. When the DVI input interface is used, a DVI input character is marked under 1-12 DVI input interfaces, the DVI input character is a DVI-I mother seat, the interfaces are connected with video sources, and DVI signals are input from the video sources. The DVI ring-out interface 1-10 is marked with a DVI ring-out character, is a DVI-I mother seat, and is connected with local display equipment for displaying video pictures. The EDID read button 1-5 is marked with "EDID" below, and is used to overwrite information stored in the EDID memory chip. The character of 'AC 220V' is marked under the input interface 1-1 of the AC power supply, and the AC power supply is connected with 220V AC power. The left side is provided with a power indicator light, and the lower part of the indicator light is marked with a character 'PWR'. When the input of the alternating current power supply is normal, the power supply indicator lamp is lightened to be green. The power switch 1-2 is a ship-shaped two-gear switch, and the upper part and the lower part of the power switch are respectively marked with the characters of 'on' and 'off' and are used for controlling the power-on of the transmitter.
Fig. 3 is a schematic diagram of a transmitter back panel of the present invention. LC optical fiber interfaces 1-16 and RJ45 ports 1-18 are arranged on the rear panel of the transmitter, and double-link output of high-definition video is formed. The LC optical fiber interfaces 1-16 are marked with the character of 'light output', are single-core LC optical fiber interfaces and are connected with single-mode optical fibers. An indicator light is arranged at the lower right of the LC optical fiber interfaces 1-16 and used for indicating whether the optical fiber links are connected or not. RJ45 ports 1-18 are marked with the word "twisted pair output" to connect the twisted pairs. There are four LED pilot lamps in the both sides of RJ45 mouth, do respectively: power, a Power indicator light, and a Power supply works normally and is on; link, Link connection pilot lamp, Link connection is bright when normal; operation, a working indicator light flashes when working normally; HDCP, HDCP protocol indicator light, the light is on long when the signal source has the HDCP protocol, and the signal source flickers when the signal source does not have the HDCP protocol.
Fig. 4a is a schematic view of a front panel of a receiver of the present invention. An LC optical fiber interface 2-1, an RJ45 port 2-2, a DVI output interface 2-11 and an RS-232 interface 2-12 are arranged on the front panel of the receiver. The LC optical fiber interface 2-1 is marked with an optical input character, is a single-core LC optical fiber interface and is connected with a single-mode optical fiber. An indicator light is arranged at the lower right of the interface and used for indicating whether the optical fiber link is normal or not. The RJ45 ports 2-2 are marked with the word "twisted pair input" to connect the twisted pairs. There are four LED pilot lamps in the both sides of RJ45 mouth, do respectively: power, a Power indicator light, and a Power supply works normally and is on; link, Link connection pilot lamp, Link connection is bright when normal; operation, a working indicator light flashes when working normally; HDCP, HDCP protocol indicator light, the light is on long when the signal source has the HDCP protocol, and the signal source flickers when the signal source does not have the HDCP protocol. The DVI output interface 2-11 is marked with a DVI output character, is a DVI-I mother seat, outputs high-definition video signals and is connected with a far-end display device. The RS-232 interface 2-12 is marked with the word 'RS-232', which is a DB9 mother seat and is used for changing the preferential selection of an optical fiber link or a twisted pair link in the double-link transmission. The interface sends serial port commands to processors 2-7 in the receiver, the command 0xFF000A0100AA is optical fiber link priority, the command 0xFF000A0200AA is twisted pair link priority, and the processors 2-7 control the DVI selection unit 2-8 to preferentially select corresponding links after receiving the commands.
Fig. 4b is a schematic view of the back panel of the receiver of the present invention. An AC power input interface 2-13 and a power switch 2-14 are arranged on the rear panel of the receiver. The alternating current power input interface 2-13 is marked with the character of 'AC 220V', and is connected with 220V alternating current when in use and is used for supplying power to a receiver. The power switches 2-14 are ship-shaped two-gear switches, and are respectively marked with the characters of 'on' and 'off' from top to bottom for controlling the power-on of the receiver.
Fig. 5 is a schematic diagram of a transmitter structure of the present invention.
Fig. 6 is a schematic diagram of a receiver structure according to the present invention.
Fig. 7a, 7b, 7c and 7d are schematic connection diagrams of application examples of the invention.
As shown in fig. 7a, 7b and 7c, the present invention is used in a manner that the transmitter and the receiver are directly connected. In which fig. 7a shows the case where only a single mode optical fiber is connected between the transmitter and the receiver, and fig. 7b shows the case where only a twisted pair is connected between the transmitter and the receiver. Both cases are single link connections, which are suitable for situations where only one cable exists between the transmitter and the receiver. Once link transmission fails or a line is broken, the high-definition video signal of the video source cannot be transmitted to the remote display device. Fig. 7c shows that a single-mode fiber and a twisted pair are simultaneously connected between the transmitter and the receiver to form a dual-link hot standby transmission of high-definition video. No matter which link transmission breaks down or the circuit is damaged, the receiver automatic switch-over to the high definition video of another link transmission ensures that the high definition video signal of video source output normally shows on distal end display device. Moreover, the usage shown in fig. 7c combines the advantages of strong damage resistance of twisted pair, no electromagnetic radiation of optical fiber, good confidentiality and long transmission distance, and greatly enhances the reliability of the high-definition video transmission system.
Fig. 7d shows the use of the matrix connection between the transmitter and the receiver according to the invention. The optical fiber output and the twisted pair output of the transmitter are respectively connected to the optical fiber input of the high-definition hybrid matrix 1 and the twisted pair input of the high-definition hybrid matrix 2, and the optical fiber output of the high-definition hybrid matrix 1 and the twisted pair output of the high-definition hybrid matrix 2 are respectively connected to the optical fiber input and the twisted pair input of the receiver, so that backup of the high-definition video matrix is formed. The video signals output to the receiver by the high-definition mixing matrix 1 and the high-definition mixing matrix 2 may be the same or different. No matter whether high definition mixing matrix 1 or high definition mixing matrix 2 breaks down and leads to the transmission to realize, the video signal of receiver is automatic seamless route to another link on, guarantees that far-end display device continues to work. The reliability and the stability of the video transmission switching system are greatly enhanced by adopting the connection mode.
The present invention provides a high definition video dual link hot standby transmission device, and the method and the way for implementing the technical solution are many, the above description is only the preferred embodiment of the present invention, it should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications may be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (8)
1. A high-definition video double-link hot standby transmission device is characterized by comprising a transmitter and a receiver which are connected with each other; the transmitter comprises a power supply conversion module, an input module, an output module, an EDID module and a control unit;
the power supply conversion module comprises an alternating current power supply input interface, a power supply switch, an AC-DC unit and a DC-DC unit;
the input module comprises a DVI input interface, a DVI input unit and a DVI distribution unit, wherein the DVI input interface is a DVI-I female seat, receives DVI signals, and divides the input DVI signals into three paths after passing through the DVI input unit and the DVI distribution unit;
the output module includes DVI output unit, DVI ring-out interface, electricity/light conversion and processing unit, LC fiber interface, HDBaseT transmitting circuit and RJ45 mouth, and DVI distribution unit divides the DVI signal of input into three routes: the first path is output from a DVI ring-out interface after passing through a DVI output unit, the DVI ring-out interface is a DVI-I female seat, and DVI signals are output and used for being connected with a monitoring video source of local display equipment; the second path is changed into an optical signal through an electric/optical conversion and processing unit and is output from the LC optical fiber interface; the third path is output from an RJ45 port through an HDBaseT transmitting circuit, and signals output from an LC optical fiber interface and an RJ45 port respectively pass through an optical fiber and a twisted pair to form a transmitting end of the high-definition video double-link hot standby transmission;
the EDID module comprises an EDID control interface, an EDID management unit and an EDID storage chip, and is controlled by the control unit to change EDID information stored in the EDID storage chip;
the control unit comprises a processor and an EDID reading button, the processor is communicated with the EDID management unit through an EDID control interface, when the transmitter is electrified and works normally, the local display device is connected with the DVI ring-out interface, the EDID reading button is pressed, the processor controls the EDID management unit to read EDID information in the local display device connected with the DVI ring-out interface and store the EDID information into an EDID storage chip, the EDID storage chip is a nonvolatile memory and can still maintain the EDID information after power failure, when the transmitter is used normally, a video source connected with the DVI input interface reads the EDID information in the EDID storage chip through the EDID management unit so as to ensure that the transmitted video format is correct; the receiver comprises a receiver power conversion module, a double-link receiving module, a DVI output module and a receiver control unit;
the receiver power conversion unit comprises an alternating current power input interface, a power switch, an AC-DC unit and a DC-DC unit, and converts 220V alternating current into direct current voltage required by the receiver to work;
the double-link receiving module comprises an LC optical fiber interface, an optical/electrical conversion and processing unit, an RJ45 port, an HDBaseT receiving circuit, a signal detection circuit 1 and a signal detection circuit 2, wherein the optical/electrical conversion and processing unit converts optical signals received from the single-mode optical fiber into DVI signals through the LC optical fiber interface, the HDBaseT receiving circuit converts the signals received from the twisted pair into the DVI signals through the RJ45 port, and the DVI signals converted from the optical/electrical conversion and processing unit and the HDBaseT receiving circuit are respectively sent to the DVI output module after passing through the signal detection circuit 1 and the signal detection circuit 2;
the DVI output module comprises a DVI selection unit, a seamless switching unit, a DVI output unit and a DVI output interface, the DVI selection unit selects DVI signals output by the signal detection circuit 1 and the signal detection circuit 2 and sends the DVI signals to the seamless switching unit, the seamless switching unit adopts a buffer frame method to carry out seamless processing on the DVI signals so as to ensure the integrity of a display picture when switching to another link after the signals of a certain link are lost, and the DVI signals which are subjected to the seamless processing are sent to a far-end display device from the DVI output interface through the DVI output unit;
the control unit of the receiver includes processor and RS-232 interface, the processor receives the instruction signal of DVI signal that the real-time signal detection circuit 1 and signal detection circuit 2 send, DVI signal of which one way of selection of control DVI selector unit, when the DVI signal that the signal detection circuit 1 detects the light/electricity and output of the processing unit, and the DVI signal that the signal detection circuit 2 does not detect HDBaseT receiving circuit and output, the DVI signal that the signal detection circuit 1 outputs of processor control DVI selector unit; when the signal detection circuit 1 does not detect the DVI signal output by the optical/electrical conversion and processing unit and the signal detection circuit 2 detects the DVI signal output by the HDBaesT receiving circuit, the processor controls the DVI signal output by the DVI selection unit selection signal detection circuit 2; when the DVI signal is detected by both the signal detection circuit 1 and the signal detection circuit 2, the processor controls the DVI selection unit to select the signal according to the setting of the priority.
2. The dual-link hot standby transmission device for high definition video according to claim 1, wherein the transmitter comprises a front panel of the transmitter, and the front panel of the transmitter is provided with a DVI input interface, an EDID read button, a DVI ring-out interface, an ac power input interface and a power switch.
3. The apparatus according to claim 2, wherein the transmitter comprises a rear panel of the transmitter, and the rear panel of the transmitter is provided with an LC fiber interface and an RJ45 port.
4. The apparatus according to claim 3, wherein the receiver comprises a front panel of the receiver, and the front panel of the receiver comprises an LC fiber interface, an RJ45 port, a DVI output interface, and an RS-232 interface.
5. The apparatus according to claim 4, wherein the receiver comprises a receiver back panel, and the receiver back panel is provided with an AC power input interface and a power switch.
6. The dual-link hot-standby transmission device for high-definition video according to claim 5, wherein the receiver and the transmitter are connected by a single-mode optical fiber.
7. The dual-link hot-standby transmission device for high-definition video according to claim 5, wherein the receiver and the transmitter are connected by twisted pair cable.
8. The dual-link hot-standby transmission device for high-definition video according to claim 5, wherein the receiver and the transmitter are connected by a matrix.
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| CN201810122232.2A CN108471512B (en) | 2018-02-07 | 2018-02-07 | High-definition video dual-link hot standby transmission equipment |
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| CN201810122232.2A CN108471512B (en) | 2018-02-07 | 2018-02-07 | High-definition video dual-link hot standby transmission equipment |
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| CN108471512B true CN108471512B (en) | 2020-04-17 |
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| CN110958405A (en) * | 2019-11-22 | 2020-04-03 | 中船重工（武汉）凌久电子有限责任公司 | Ultra-high-definition display control system and method based on optical fiber encoding and decoding 4Kx2K |
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| CN201830396U (en) * | 2010-07-30 | 2011-05-11 | 江苏新创光电通信有限公司 | Digital visual interface/high-definition multimedia interface (DVI/HDMI) optical transmitter and receiver |
| CN104158822A (en) * | 2014-08-29 | 2014-11-19 | 中国航空无线电电子研究所 | Point-to-point transmission system of optical fiber links based on dual-channel binding and transmission method |
| CN107390556A (en) * | 2017-08-17 | 2017-11-24 | 中国电子科技集团公司第二十八研究所 | A kind of indication control board high definition shows shared switching device and control method |
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| US8250620B1 (en) * | 1998-12-30 | 2012-08-21 | At&T Intellectual Property Ii, L.P. | System and method for sharing information between a concierge and guest |
| US8390467B2 (en) * | 2011-01-12 | 2013-03-05 | Crestron Electronics Inc. | Cable clamp-on device including a user interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201830396U (en) * | 2010-07-30 | 2011-05-11 | 江苏新创光电通信有限公司 | Digital visual interface/high-definition multimedia interface (DVI/HDMI) optical transmitter and receiver |
| CN104158822A (en) * | 2014-08-29 | 2014-11-19 | 中国航空无线电电子研究所 | Point-to-point transmission system of optical fiber links based on dual-channel binding and transmission method |
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