CN101330578A - Intelligent switching system for digital television signal - Google Patents
Intelligent switching system for digital television signal Download PDFInfo
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- CN101330578A CN101330578A CNA2008100118582A CN200810011858A CN101330578A CN 101330578 A CN101330578 A CN 101330578A CN A2008100118582 A CNA2008100118582 A CN A2008100118582A CN 200810011858 A CN200810011858 A CN 200810011858A CN 101330578 A CN101330578 A CN 101330578A
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Abstract
The invention relates to a digital television signal intelligent switching system which comprises a case, a power supply, a control panel and a switch board; the switch board is a core of the system; the switch board, the control panel and the power supply are inserted in the case through a slideway in the case; main and standby input signals enter an equalizer of the switch board for carrying out processing, the signals after processing are transmitted to a single chip microcomputer for detecting whether the signals are abnormal or not after being subjected to conversion, processing and analysis by passing through a large-scale FPGA chip; if abnormal, the alarm is controlled through the single chip microcomputer in the switch board, the alarm information is transmitted to the control panel, and the control panel transmits the information to an upper control computer; if the abnormal signals are confirmed, the emergency switching operation of the FPGA in the switching board is carried out. The digital television signal intelligent switching system has the advantages that SDI, ASI and other signals are monitored on a real-time basis; if the signal interruption, the PID error and other faults are found or the unlawful attacks are received, the timely alarm and the emergency automatic switch are carried out, thereby ensuring the high-efficient and safe play and the transmission of digital television signals.
Description
Technical field
The invention belongs to the video and audio frequency technology applications field in the electronic information field, relate to a kind of intelligent switching system for digital television signal.
Background technology
At present, in China's field of broadcast televisions, it is not only a technical problem that safety is broadcasted, should take precautions against because signal interruption and the fault that technical reason causes, take precautions against the attack of illegal signals again to us, this just need monitor in real time to intrasystem signal of interest, report to the police, and the automatic emergency that carries out intelligence switches, background technology of the present invention is based on the TS stream signal of ISO/IEC 13818 (MPEG-2) signal standards, the sdi signal of SMPTE259M/292M/272M and based on the signal bit stream detection technique of TR101 290 standards, and based on the Digital Signal Analysis technology of FPGA.
Summary of the invention
The purpose of this invention is to provide a kind of intelligent switching system for digital television signal, the system that realization is monitored in real time to various analog and digital signals and intelligence is switched, this system can not rely on equipment such as multiplexer, matrix and independently uses, also can work in coordination by Integrated Network Management System and realize broadcasting safely of radio and television, provide monitoring result and alarm logging simultaneously with the said equipment; When going wrong, main path signal automatically switches to road signal fully, when all there is problem on active and standby road, then fill up automatically and broadcast or produce auxiliary signal, when main path signal recovers, can also recover back main path signal automatically, thus guarantee various signals do not interrupt safe broadcast.
In order to achieve the above object, technical scheme of the present invention is as follows:
Intelligent switching system for digital television signal, comprise cabinet, power supply, control board and switch boards, described power supply is made up of active and standby two power subsystems, described control board is one, the quantity of described switch boards is matched by the user, and scope is between 1～8, and described power supply, control board, switch boards all are pluggable, can insert described cabinet by the slideway in the described cabinet, and be connected with motherboard with backboard in the described cabinet by socket.
Power bus and control bus are arranged on the described motherboard, and all circuit boards all are connected with described motherboard by socket, and by the power bus acquisition ± 6.5V power supply on the motherboard, described control board then carries out communication by 485 control buss on the motherboard and described switch boards.
Described every switch boards except that by the power bus on socket and the described motherboard with control bus is connected, also be connected with signal backplane by socket, be BNC socket on the signal backplane, vision signal inserts BNC socket and enters described switch boards inside by vision cable.Two RS232 sockets and a RJ45 network interface are then arranged on the backboard of described control board, can be connected with multi-form with extraneous control computer or network.
The course of work of intelligent switching system for digital television signal of the present invention is as follows:
(a) active and standby road input signal enters switch boards, and the input uniform process chip is carried out equilibrium to signal and amplified and unipolar signal is converted to differential signal;
(b) signal of handling through the equilibrium treatment chip enters fpga chip, fpga chip at first carries out data and clock recovery to input differential signal and is converted into the 8 parallel-by-bit data that speed is 27MHz, these data enter the FIFO memory subsequently and store, the core processing unit of FPGA inside begins data are analyzed, and according to ISO/IEC 13818 and TR101 290 standard logarithmic according to comparing and treating, extract the PID numerical value of code stream;
(c) after FPGA finishes dealing with to data analysis, send the result to single-chip microcomputer by control bus, single-chip microcomputer compares this result and user preset data and provides signal support or unusual mark;
(d) single-chip microcomputer detects abnormal signal, then can start buzzer warning and by control bus warning message be sent to described control board, and described control board sends to upper control computer to information;
(e) confirmation signal unusual after, Single-chip Controlling FPGA will import automatically to switch to from main road and be equipped with the road.
In the intelligent switching system for digital television signal of the present invention, the signal that is detected comprises signals such as SDI, ASI, can carry out EAV, SAV, EDH detection and chroma luminance and content analysis to described sdi signal, can carry out PAT, PMT to the analysis of described ASI signal and analyze, PID detects.
The invention has the beneficial effects as follows: solved the multiple signal source of digital TV front-end, the signal automatic monitoring of a plurality of links, intelligent switching problem; The user can carry out monitoring management to the signal of interest in the system even all signals as required selectively, have compact conformation, fast, the accuracy of detection advantages of higher of switch speed, after all configurations are finished, do not need manual intervention to monitor automatically and the intelligence switching; Owing to adopted large-scale fpga chip, can analyse in depth and monitor signal, for example can carry out PAT, PMT to the ASI signal analyzes, PID detects, can carry out EAV, SAV, EDH detection and chroma luminance and content analysis to sdi signal, solve legacy equipment and can only carry out the drawback that simple signal has or not detection; Monitoring system can be to each road signal real-time code stream monitoring and analysis, by variation in the distinguishing signal transmission course and mistake, provide warning message in real time, and carry out corresponding emergency processing, finish monitoring, report to the police and emergent the switching, guarantee broadcast and transmission that digital television signal is efficient, safe, economic and social benefit is remarkable.
Description of drawings
Fig. 1 is the hardware structure diagram of intelligent switching system for digital television signal of the present invention.
Fig. 2 is the example structure figure of intelligent switching system for digital television signal of the present invention.
Fig. 3 is the detection switching flow figure of intelligent switching system for digital television signal of the present invention.
Among the figure: 1, cabinet, 2, switch boards, 3, control board, 4, power supply, 5, EQ equilibrium treatment chip, 6, core processing unit FPGA, 7, single-chip microcomputer, 8, distribution amplifier, 9, power subsystem, 10, status indicator lamp, 11, the RS485 communication interface.
Embodiment
That the present invention will be further described is as follows below in conjunction with the drawings and specific embodiments:
As shown in Figure 1, intelligent switching system for digital television signal of the present invention comprises cabinet 1, switch boards 2, control board 3 and power supply 4, wherein, power supply 4 is made up of active and standby two power subsystems, and control board 3 is one, and the quantity of switch boards 2 is matched by the user, scope is between 1～8, switch boards 2, control board 3, power supply 4 all are pluggable, can insert cabinet 1 by the slideway in the cabinet 1, and are connected with motherboard by socket and cabinet 1 interior backboard.
As shown in Figure 2, in the embodiment of intelligent switching system for digital television signal of the present invention, this system comprises EQ equilibrium treatment chip 5, core processing unit FPGA6, single-chip microcomputer 7, distribution amplifier 8, power subsystem 9, status indicator lamp 10 and RS485 communication interface 11.Wherein, the signal of 5 pairs of inputs of EQ equilibrium treatment chip is handled, the signal that to handle sends core processor FPGA6 to then, core processor FPGA6 with conversion of signals be parallel data and carry out analyzing and processing after send the result to single-chip microcomputer 7, whether single-chip microcomputer 7 testing results are unusual, single-chip microcomputer 7 will detect feedback information and give core processor FPGA6, information just often core processor FPGA6 sends signal to distribution amplifier 8, distribution amplifier 8 is with the laggard line output of signal processing, the state of single-chip microcomputer 7 state of a control indicator lights 10 indication detection information, power subsystem 9 is responsible for system's power supply.
When single-chip microcomputer 7 detects abnormal signal, start warning and send warning message to described control board 3 by RS485 communication interface 11, after confirmation signal was unusual, single-chip microcomputer 7 control core processor FPGA6 switched input.
The signal that EQ equilibrium treatment chip 5 receives derives from outside main multiplexer and is equipped with multiplexer, and distribution amplifier 8 sends to outside QAM modulator with signal.
After core processor FPGA 6 receives the signal that EQ equilibrium treatment chip 5 handled, by string and conversion, input differential signal is carried out data and clock recovery and is converted into the 8 parallel-by-bit data that speed is 27MHz, these data enter the FIFO memory subsequently and store, the core processing unit of FPGA inside begins data are analyzed, and according to ISO/IEC 13818 and TR101 290 standard logarithmic according to comparing and treating, extract the PID numerical value of code stream.
Core processor FPGA6 analyses in depth and monitors signal, for example can carry out PAT, PMT to the ASI signal and analyze, and PID detects, and can carry out EAV, SAV, EDH detection and chroma luminance and content analysis to sdi signal.
As shown in Figure 3, be the detection switching flow figure of intelligent switching system for digital television signal of the present invention.After core processor FPGA6 receives the signal of handling through EQ equilibrium treatment chip 5, at first detect have or not (the step S21) of active and standby signal,, then send the no signal indication, then carry out active and standby input handover operation (step S25) if detect no signal; If detect signal is arranged, then continue detection and have or not 47H (step S22).If detect no 47H, then send the timing error indication, then carry out active and standby input handover operation (step S25); If detect signal is arranged, then carry out next step detection, detect PID whether correctly (step 23).Core processor FPGA6 needs the whole PID in the signal are detected, if some PID mistakes are wherein then sent the indication of PID mistake, then carries out active and standby input handover operation (step S25); If PID is correct, then carry out the judgement (step 24) whether PID has all detected.If all do not detected, then continue to detect (step 23); If PID has all detected, then carry out the detection of a new round.
Present embodiment selects for use the FPGA of altera corp as core processing unit, can select different series and model according to the user's request of reality.Input and output, logic analysis, comprehensive computing are organically combined into an integral body with control system by CPU core.
1, present embodiment can be finished following function:
A. essential information: mainly provide the most basic information, as transmission rate, timing error, the TS packet length of TS stream, look the brief information of audio frequency ratio, PSI table etc., the form of sdi signal, code check etc. about digital signal to the user.
B. monitoring in real time: native system designs according to 3 grades of error detection contents of DVB ETR290 standard code ASI, can detect according to SMPTE259M/292M/272M and CCIR656 standard sdi signal.
C. programme information: show the PSI that describes a programme content and the specifying information of PMT, SDT and EIT by software.
D. the switching that active and standby and pad is broadcast signal appears can carrying out when unusual in signal.
2, the characteristics with existing product contrast
The product with similar functions of home broadcasting TV department use at present mostly is external imported product greatly, and with these products relatively, the present invention has following characteristics:
A. with better function, both can realize the switching of signal, can also realize that the pad of signal is broadcast.
B. can independently use, switch speed is fast.
C. it is wide to be suitable for range of signal, looks various signals such as audio frequency applicable to ASI, SDI, AES, simulation.
D. it is strong to fill up multicast function, both can use the content that has recorded, also can generate pad in real time and broadcast content.
The present invention is that this system can realize stable and long-term reliably working based on general large-scale F PGA, based on the method for designing of embedded hardware platform, and volume is little, has good cost performance, can adapt to range of application and occasion widely.
Claims (4)
1, intelligent switching system for digital television signal, it is characterized in that, this system comprises cabinet (1), switch boards (2), control board (3) and power supply (4), switch boards (2), control board (3) and power supply (4) insert cabinet (1) by the slideway in the cabinet (1), and be connected with motherboard by the backboard in socket and the cabinet (1), described control board (3) carries out communication by control bus on the motherboard and described switch boards (2); The course of work of this system is as follows: (a) active and standby road input signal enters switch boards (2), and the input uniform process chip is handled signal; (b) signal of handling through the equilibrium treatment chip enters fpga chip, and fpga chip is changed accordingly, analyzes, compared and handle data, extracts the PID numerical value of code stream; (c) after FPGA finishes dealing with to data analysis, send the result to single-chip microcomputer by control bus, single-chip microcomputer compares this result and user preset data, and provides signal support or unusual mark; (d) single-chip microcomputer detects abnormal signal, then can start buzzer warning and by control bus warning message be sent to described control board (3), and described control board (3) sends to upper control computer to information; (e) confirmation signal unusual after, Single-chip Controlling FPGA will import automatically to switch to from main road and be equipped with the road.
2, intelligent switching system for digital television signal as claimed in claim 1, it is characterized in that described power supply (4) is by the main road power subsystem and be equipped with the road power subsystem and form, described switch boards (2) is 1～8, mainly be made up of FPGA, described control board (3) is 1.
3, intelligent switching system for digital television signal as claimed in claim 1 or 2, it is characterized in that, described switch boards (2) is connected with control bus with power bus on the described motherboard by socket, and be connected with signal backplane by socket, be BNC socket on the described signal backplane, vision signal inserts BNC socket by vision cable and enters the inside of described switch boards (2); The backboard of described control board (3) is provided with two RS232 sockets and a RJ45 network interface, is connected with multi-form with extraneous control computer or network.
4, intelligent switching system for digital television signal as claimed in claim 1, it is characterized in that, the signal of described detection comprises sdi signal, ASI signal, described sdi signal is carried out EAV, SAV, EDH detection and chroma luminance and content analysis, described ASI signal is carried out PAT, PMT analyze detection with PID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100118582A CN101330578A (en) | 2008-06-13 | 2008-06-13 | Intelligent switching system for digital television signal |
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| CNA2008100118582A CN101330578A (en) | 2008-06-13 | 2008-06-13 | Intelligent switching system for digital television signal |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924884A (en) * | 2010-06-26 | 2010-12-22 | 大连捷成实业发展有限公司 | Digital video signal switching circuit and method |
| CN102006498A (en) * | 2010-12-10 | 2011-04-06 | 北京中科大洋科技发展股份有限公司 | Safe broadcast monitoring method based on video and audio comparison |
| CN101695135B (en) * | 2009-10-20 | 2011-07-20 | 大连捷成实业发展有限公司 | SDI numerical error code detection based on FPGA and correction algorithm thereof |
| CN102238413A (en) * | 2011-06-02 | 2011-11-09 | 上海风格信息技术有限公司 | High-reliability asynchronous serial interface (ASI) signal switching equipment and ASI signal failure delay judgment method |
| CN102761710A (en) * | 2011-04-29 | 2012-10-31 | 北京真视通科技股份有限公司 | Audio/video intelligent switcher |
| CN103379385A (en) * | 2012-04-26 | 2013-10-30 | Tcl集团股份有限公司 | Method for controlling smart television and operating system of smart television |
| CN104301626A (en) * | 2013-07-18 | 2015-01-21 | 北大方正集团有限公司 | Video source switching monitoring method, device and system |
| CN107959807A (en) * | 2017-12-29 | 2018-04-24 | 重庆洪深现代视声技术有限公司 | Broadcast safe broadcasts TS stream intelligent switching systems |
| CN113329262A (en) * | 2021-05-28 | 2021-08-31 | 海信视像科技股份有限公司 | Display equipment and control method for switching playing backup signal source |
-
2008
- 2008-06-13 CN CNA2008100118582A patent/CN101330578A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101695135B (en) * | 2009-10-20 | 2011-07-20 | 大连捷成实业发展有限公司 | SDI numerical error code detection based on FPGA and correction algorithm thereof |
| CN101924884A (en) * | 2010-06-26 | 2010-12-22 | 大连捷成实业发展有限公司 | Digital video signal switching circuit and method |
| CN102006498A (en) * | 2010-12-10 | 2011-04-06 | 北京中科大洋科技发展股份有限公司 | Safe broadcast monitoring method based on video and audio comparison |
| CN102006498B (en) * | 2010-12-10 | 2012-05-30 | 北京中科大洋科技发展股份有限公司 | Safe broadcast monitoring method based on video and audio comparison |
| CN102761710A (en) * | 2011-04-29 | 2012-10-31 | 北京真视通科技股份有限公司 | Audio/video intelligent switcher |
| CN102238413A (en) * | 2011-06-02 | 2011-11-09 | 上海风格信息技术有限公司 | High-reliability asynchronous serial interface (ASI) signal switching equipment and ASI signal failure delay judgment method |
| CN102238413B (en) * | 2011-06-02 | 2013-06-12 | 上海风格信息技术股份有限公司 | High-reliability asynchronous serial interface (ASI) signal switching equipment and ASI signal failure delay judgment method |
| CN103379385A (en) * | 2012-04-26 | 2013-10-30 | Tcl集团股份有限公司 | Method for controlling smart television and operating system of smart television |
| CN103379385B (en) * | 2012-04-26 | 2016-08-03 | Tcl集团股份有限公司 | The control method of intelligent television and operating system |
| CN104301626A (en) * | 2013-07-18 | 2015-01-21 | 北大方正集团有限公司 | Video source switching monitoring method, device and system |
| CN107959807A (en) * | 2017-12-29 | 2018-04-24 | 重庆洪深现代视声技术有限公司 | Broadcast safe broadcasts TS stream intelligent switching systems |
| CN113329262A (en) * | 2021-05-28 | 2021-08-31 | 海信视像科技股份有限公司 | Display equipment and control method for switching playing backup signal source |
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Open date: 20081224 |