CN210469537U - Optical SDI single-fiber bidirectional controllable screen OPS interface audio-video converter - Google Patents
Optical SDI single-fiber bidirectional controllable screen OPS interface audio-video converter Download PDFInfo
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- CN210469537U CN210469537U CN201921952941.XU CN201921952941U CN210469537U CN 210469537 U CN210469537 U CN 210469537U CN 201921952941 U CN201921952941 U CN 201921952941U CN 210469537 U CN210469537 U CN 210469537U
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Abstract
The utility model provides a controllable screen OPS interface audio/video converter based on light SDI single fiber is two-way, including photoelectricity/electro-optical conversion circuit, high definition SDI decoding circuit, electric SDI loop out circuit, DA audio conversion circuit, high definition HDMI coding circuit, microprocessor and OPS interface; the photoelectric/electro-optical conversion circuit is bidirectionally connected with the control server through a single-core bidirectional optical fiber; the photoelectric/electro-optical conversion circuit is connected with the high-definition SDI decoding circuit; the high-definition SDI decoding circuit is connected with the microprocessor through an SPI interface; the microprocessor is connected with the display terminal through the OPS interface to carry out serial port communication; the high-definition HDMI coding circuit is connected with the display terminal through an OPS interface for displaying. Has the following advantages: the remote control and remote display of the display terminal by the control server through the audio/video converter can be realized; the method has the advantages of long communication distance, low complexity of system configuration, easy installation and deployment and simple wiring.
Description
Technical Field
The utility model belongs to the technical field of audio video conversion, concretely relates to based on two-way controllable screen OPS interface audio video converter of light SDI single fiber.
Background
In the field of video transmission, for example, in a station display subsystem of a subway PIS, an audio/video converter has realized the long-distance transmission of high-definition video signals through an optical SDI, and also has realized the high integration of the converter and a display terminal, but the audio/video converter only has the display function of the high-definition video signals and cannot control the display terminal. The needs of the owners for controlling and querying the display terminals are increasing day by day, for example, the owners control the on/off and volume of the display terminals to obtain the state information of the display terminals, such as the on/off state, volume, real-time power consumption, signal source selection state, and the like, so that the server can make the judgment and response according to the returned information. At present, a technical scheme for simultaneously realizing two functions of high-definition video signal remote display and two-way communication does not exist. In the aspect of controlling a display terminal, the prior art scheme mainly has the following defects:
the traditional display terminal control mode is to use a remote controller and control through infrared emission. While infrared emission is limited in distance, typically within 10 meters, and cannot pass through solid obstacles. Therefore, the staff must go to each display terminal to set the display terminal, and can not communicate with other devices, which is inconvenient for the staff to use.
With the development of communication technology, most display terminals are provided with a serial port (RS232) through which the display terminals can be completely operated, and the functions of the display terminals are stronger than those of the display terminals using a remote controller. Through utilizing the serial ports to send commands, some simple operations can be carried out on the display terminal, such as turning on and off the display terminal, adjusting the volume, changing channels and the like. Besides, functions which cannot be realized by some remote controllers, such as screen blacking and screen locking, can also be realized. Each button instruction can be sent through the serial port, so that the remote controller of the display terminal can be completely replaced in function, and interaction between the control center and the display terminal is realized. However, since the RS232 has limited communication capability, when the communication rate reaches 19.2Kbps, the transmission distance of the signal is only 15 meters, which greatly limits the spatial range of the display terminal that can be controlled by the control system.
In the prior art, the problem of short RS232 communication distance is avoided by converting RS232 to RS485 in some cases, although the purpose of remote control is realized, conversion equipment needs to be added in a control center and a display terminal, the system complexity is greatly increased, inconvenience is brought to system installation, and one more link is added, so that one more level of risk is added. Furthermore, the display and the control are independent by adopting an external serial port, the installation and the deployment are not easy, and the cable is complicated.
SUMMERY OF THE UTILITY MODEL
The defect to prior art exists, the utility model provides a based on two-way controllable screen OPS interface audio frequency and video converter of light SDI single fiber can effectively solve above-mentioned problem.
The utility model adopts the technical scheme as follows:
the utility model provides a controllable screen OPS interface audio/video converter based on light SDI single fiber is two-way, including photoelectricity/electro-optical conversion circuit, high definition SDI decoding circuit, electric SDI loop out circuit, DA audio conversion circuit, high definition HDMI coding circuit, microprocessor and OPS interface;
the photoelectric/electro-optical conversion circuit is bidirectionally connected with the control server through a single-core bidirectional optical fiber; the output end of the photoelectric/electro-optical conversion circuit is connected with the input end of the high-definition SDI decoding circuit; the high-definition SDI decoding circuit is provided with four output ends which are an original audio and video data output end, an audio output end, an SPI communication interface output end and a serial signal output end respectively; an original audio and video data output end of the high-definition SDI decoding circuit is connected to an input end of the OPS interface through the high-definition HDMI coding circuit; the audio output end of the high-definition SDI decoding circuit is connected to the input end of the OPS interface through the DA audio conversion circuit; a serial signal output end of the high-definition SDI decoding circuit is connected to the electric SDI loop-out circuit; the output end of the SPI communication interface of the high-definition SDI decoding circuit is connected to the input end of the microprocessor; the first serial port of the microprocessor is in bidirectional connection with the UART interface of the OPS interface; the second serial port of the microprocessor is connected with the input end of the photoelectric/electro-optical conversion circuit; the OPS interface is embedded into the display terminal.
Preferably, the photoelectric/electro-optical conversion circuit is an SFP interface.
Preferably, the IO port of the microprocessor is connected to an address setting circuit; the IO port of the microprocessor and the first serial port of the microprocessor are connected to the indicator light.
The utility model provides a based on two-way controllable screen OPS interface audio video converter of light SDI single fiber has following advantage:
the audio-video converter is provided with a photoelectric/electro-optical conversion circuit which realizes bidirectional connection with the control server through a single-core bidirectional optical fiber, so that the control server realizes remote control and remote display of the display terminal through the audio-video converter; the method has the advantages of long communication distance, low complexity of system configuration, easy installation and deployment and simple wiring.
Drawings
Fig. 1 is a schematic diagram of the structural principle of an optical SDI single-fiber bidirectional controllable screen OPS interface audio/video converter provided by the present invention;
fig. 2 is a panel diagram of an audio/video converter of an OPS interface based on optical SDI single fiber bi-directional controllable screen provided by the present invention;
fig. 3 is the utility model provides a based on the two-way controllable screen OPS interface audio-video converter of light SDI single fiber and the relation of connection diagram of OPS interface.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The utility model provides a based on two-way controllable screen OPS interface audio and video converter of light SDI single fiber, this audio and video converter is based on light SDI (digital component serial interface) to single core two-way single fiber realizes audio and video converter and control server both way junction communication as transmission medium.
The audio-video converter is connected with the display terminal through an OPS interface with a high-definition audio-video interface and a UART communication interface, so that the audio-video converter can be embedded into the display terminal, the connection between the audio-video converter and the display terminal is realized, and two functions of display and control are specifically integrated. An address is set on the audio/video converter through an address setting circuit, namely a dial switch, so that a worker can control each display terminal in the control server.
Referring to fig. 1, 2 and 3, the optical SDI single-fiber bidirectional controllable screen OPS interface audio-video converter comprises a photoelectric/electro-optical conversion circuit, a high-definition SDI decoding circuit, an electrical SDI looping-out circuit, a DA audio conversion circuit, a high-definition HDMI encoding circuit, a microprocessor and an OPS interface;
the photoelectric/electro-optical conversion circuit is bidirectionally connected with the control server through a single-core bidirectional optical fiber; the photoelectric/electro-optical conversion circuit is an SFP interface.
The output end of the photoelectric/electro-optical conversion circuit is connected with the input end of the high-definition SDI decoding circuit; the high-definition SDI decoding circuit is provided with four output ends which are an original audio and video data output end, an audio output end, an SPI communication interface output end and a serial signal output end respectively; an original audio and video data output end of the high-definition SDI decoding circuit is connected to an input end of an OPS interface through the high-definition HDMI coding circuit; the audio output end of the high-definition SDI decoding circuit is connected to the input end of the OPS interface through the DA audio conversion circuit; a serial signal output end of the high-definition SDI decoding circuit is connected to the electric SDI loop-out circuit; the output end of the SPI communication interface of the high-definition SDI decoding circuit is connected to the input end of the microprocessor; the first serial port of the microprocessor is in bidirectional connection with the UART interface of the OPS interface; the second serial port of the microprocessor is connected with the input end of the photoelectric/electro-optical conversion circuit; the OPS interface is embedded into the display terminal.
The IO port of the microprocessor is connected with an address setting circuit; the IO port of the microprocessor and the first serial port of the microprocessor are both connected to the indicator light.
The following describes each circuit in detail:
SDI signal receiving system
1. Photoelectric/photoelectric conversion circuit
The photoelectric/electro-optical conversion circuit is bidirectionally connected with the control server through a single-core bidirectional optical fiber, so that bidirectional communication between the photoelectric/electro-optical conversion circuit and the control server is realized. The method specifically comprises the following steps:
1) the photoelectric/electro-optical conversion circuit receives an optical SDI signal issued by the control server, converts the received optical SDI signal (embedded serial port signal) into a high-speed differential pair signal, and outputs the high-speed differential pair signal to the high-definition SDI decoding circuit.
2) The photoelectric/electro-optical conversion circuit receives the low-speed electric serial port signal uploaded by the microprocessor, converts the received low-speed electric serial port signal into an optical signal and uploads the optical signal to the control server.
In practical application, the photoelectric/electro-optical conversion circuit adopts an SFP interface, can receive 3G SDI optical signals, has a wavelength of 1310nm and a receiving sensitivity of up to-20 dBm, has an optical serial port transmitting wavelength of 1550nm and an optical power of up to-5 dBm, and has a speed of 9600 bps.
2. High-definition SDI decoding circuit
The high-definition SDI decoding circuit is used for decoding SDI high-speed differential electrical signals output by the photoelectric/electro-optical conversion circuit or directly input from the outside to obtain original parallel video data, IIS audio data and serial port signals, and then sending the audio and video data to the high-definition HDMI coding circuit to realize HDMI signal output; meanwhile, IIS audio data are sent to a DA audio conversion circuit, and output after signal to noise ratio enhancement and power amplification is achieved; meanwhile, the serial port signal is sent to the microprocessor, and the microprocessor reads the decoded serial port signal through a GSPI protocol.
In addition, the high-definition SDI decoding circuit also outputs a path of high-speed serial signals to the electric SDI loop-out circuit so as to carry out loop-out through the subsequent electric SDI loop-out circuit.
(II) electric SDI loop-out circuit
The electric SDI loop-out circuit needs a cable driving circuit, mainly completes pre-equalization processing and signal amplification enhancement processing of an SDI signal output by a previous high-definition SDI decoding circuit, and then outputs the SDI signal.
(III) high definition HDMI coding circuit
The high-definition HDMI coding circuit receives parallel video data and IIS audio data output by the high-definition SDI decoding circuit; and then, converting the obtained original parallel video data into an HDMI signal stream, simultaneously embedding IIS audio data into the HDMI signal stream to obtain an audio/video multiplexed HDMI signal, and outputting the audio/video multiplexed HDMI signal to a display terminal for display through an OPS interface after the signal pre-equalization processing and signal amplification enhancement processing are completed in a high-definition HDMI coding circuit.
(IV) OPS interface
Besides necessary power supply, audio/video and installation state detection end (PB _ DET), working state detection end (PWR _ STATUS), startup and shutdown signal control end (PS _ ON) and other control signal circuits, the OPS interface also designs a UART interface to realize signal transmission between the OPS interface and the microprocessor. The OPS interface is a communication interface between the microprocessor and the display terminal, and is used for transmitting a serial port signal (namely a control signal) obtained by the microprocessor to the display terminal to realize the control of the display terminal; and transmitting the state result of the display terminal back to the control server.
(V) Microprocessor
The microprocessor is a single chip microcomputer and is used for analyzing serial port signals which are de-embedded in the high-definition SDI decoding circuit, issuing the serial port signals to an OPS interface through a serial port 1 and then issuing the serial port signals to the display terminal through the OPS interface, and issuing downlink signals; and the optical fiber is also used for receiving data returned by the OPS interface, sending the data to the photoelectric/electro-optical conversion circuit and sending the data to the control server through the optical fiber. Thereby enabling two-way signal communication.
(VI) Address setting Circuit
A display system may have multiple display terminals, each of which needs to be equipped with an audio/video converter. Therefore, in order to realize individual control of the display terminal, identification of the display terminal is required. Therefore, an address setting circuit is arranged on the audio/video converter, and the address setting circuit is a dial switch, so that the address of the audio/video converter is set.
(VII) indicator light
The audio-video converter has four indicator lamps:
1) the POWER lamp indicates that the POWER is normally supplied from the OPS when the indicator lamp is normally on; when the lamp is not on or flickers, the OPS power supply is abnormal;
2) an SDI lamp which is normally on and indicates that the received SDI is normal; when the SDI is not bright or flickers, the SDI is abnormally received;
3) the TXD lamp indicates that the microprocessor issues an instruction to the display terminal when the TXD lamp flickers; when the light is not bright, the command is not issued;
4) the RXD lamp indicates that the display terminal transmits data back to the microprocessor when the lamp flickers; when the light is not bright, the data is not returned.
(VIII) Power supply management
The audio and video converter acquires a 12V power supply from a display terminal through an OPS interface, and then supplies power to each functional circuit after voltage conversion is carried out on the acquired power supply, so that the requirements of different functional circuits on different voltages are met. It is important to control the power supply of the photoelectric/electro-optical conversion circuit, and when the display terminal does not need to be controlled at ordinary times, the power supply of the transmitting part needs to be turned off to prevent the interference with the data return of other display terminals.
The specific design scheme is as follows:
the control server sends an optical SDI signal of a serial port signal embedded with a control command or a state query command, and the optical SDI signal is transmitted to the photoelectric/electro-optical conversion circuit through a single-core bidirectional optical fiber in a downlink manner; and the microprocessor at the converter end transmits the low-speed optical serial port signal to the control server in an uplink manner, so that the bidirectional transmission of the video and the control signal is realized.
Specifically, the photoelectric/electro-optical conversion circuit of the audio/video converter converts a received optical SDI signal into a high-speed differential electrical signal; then, a special high-definition SDI decoding circuit completes decoding work to obtain an original parallel video signal, an IIS audio signal and a serial port signal; the analyzed audio and video signals are coded into TMDS streams by a high-definition HDMI coding circuit and output to a display terminal through an OPS interface to be displayed; the microprocessor reads the decoded serial port signal through the GSPI interface, judges whether the serial port signal is a command for the local machine, if not, the serial port signal is not processed, if yes, the control command in the serial port signal is issued to the display terminal through the UART interface of the OPS, meanwhile, the display terminal receives the correct command to execute the corresponding action and sends the return data to the microprocessor, and the microprocessor sends the return data outwards and uploads the return data to the control server through an optical fiber through the photoelectric/electro-optical conversion circuit.
The utility model provides a based on two-way controllable screen OPS interface audio video converter of light SDI single fiber has following advantage:
the audio-video converter is provided with a photoelectric/electro-optical conversion circuit which realizes bidirectional connection with the control server through a single-core bidirectional optical fiber, so that the control server realizes remote control and remote display of the display terminal through the audio-video converter; therefore, the audio-video converter is in communication connection with the control server through a single-core bidirectional single optical fiber, so that the problem of short communication distance caused by the adoption of a remote controller and a serial port in the prior art is solved; because the audio-video converter is only needed to be configured on one side of the display terminal and the audio-video converter is not needed to be configured on one side of the control server, the complexity of system configuration is reduced, and the method has the advantages of easiness in installation and deployment and simplicity in wiring.
(2) The high integration of remote display and remote control is realized, the difficulty and cost of system installation and maintenance are reduced, and the efficiency is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.
Claims (3)
1. An optical SDI single-fiber bidirectional controllable screen OPS interface audio-video converter is characterized by comprising a photoelectric/electro-optical conversion circuit, a high-definition SDI decoding circuit, an electric SDI loop-out circuit, a DA audio conversion circuit, a high-definition HDMI coding circuit, a microprocessor and an OPS interface;
the photoelectric/electro-optical conversion circuit is bidirectionally connected with the control server through a single-core bidirectional optical fiber; the output end of the photoelectric/electro-optical conversion circuit is connected with the input end of the high-definition SDI decoding circuit; the high-definition SDI decoding circuit is provided with four output ends which are an original audio and video data output end, an audio output end, an SPI communication interface output end and a serial signal output end respectively; an original audio and video data output end of the high-definition SDI decoding circuit is connected to an input end of the OPS interface through the high-definition HDMI coding circuit; the audio output end of the high-definition SDI decoding circuit is connected to the input end of the OPS interface through the DA audio conversion circuit; a serial signal output end of the high-definition SDI decoding circuit is connected to the electric SDI loop-out circuit; the output end of the SPI communication interface of the high-definition SDI decoding circuit is connected to the input end of the microprocessor; the first serial port of the microprocessor is in bidirectional connection with the UART interface of the OPS interface; the second serial port of the microprocessor is connected with the input end of the photoelectric/electro-optical conversion circuit; the OPS interface is embedded into the display terminal.
2. The optical SDI single-fiber bidirectional based controllable screen OPS interface audio-video converter as claimed in claim 1, wherein the optical-electrical/optical-electrical conversion circuit is an SFP interface.
3. The optical SDI single-fiber bidirectional controllable screen OPS interface audio-video converter based on claim 1 is characterized in that an IO port of the microprocessor is connected with an address setting circuit; the IO port of the microprocessor and the first serial port of the microprocessor are connected to the indicator light.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134619A (en) * | 2020-09-23 | 2020-12-25 | 北京冠华天视数码科技有限公司 | Method for realizing single-fiber bidirectional transmission between play controller and display terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134619A (en) * | 2020-09-23 | 2020-12-25 | 北京冠华天视数码科技有限公司 | Method for realizing single-fiber bidirectional transmission between play controller and display terminal |
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