CN1108060C - Fully digitalized video communication and video switching method - Google Patents
Fully digitalized video communication and video switching method Download PDFInfo
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- CN1108060C CN1108060C CN 98113365 CN98113365A CN1108060C CN 1108060 C CN1108060 C CN 1108060C CN 98113365 CN98113365 CN 98113365 CN 98113365 A CN98113365 A CN 98113365A CN 1108060 C CN1108060 C CN 1108060C
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Abstract
The present invention relates to a full digital video communication and video switching method. After digital video signals are transmitted to a video processing center through a digital communication network, the signals are switched by a digital video switcher, and the switched digital signals are treated by video decoding through a video decoder; analog video signals are output to a video display device, and the decoding mode adopted by the video decoder is consistent with the encoding mode adopted by a video encoder of video collecting points. The present invention has the advantages that the manufacturing cost of the system is lowered, and the video switching capacity is largely enhanced. The present invention is especially suitable for large-sized video monitoring systems, and the present invention can utilize vacant bandwidth in transmission lines.
Description
The present invention is a kind of video communication and video switching method of total digitalization.The present invention relates to video communication and video switch, specifically, relate to a kind of long-range video communication and the picture decoding at Video processing center and the method for video switch.
Video processing center in the conventional video processing system generally has following several method to realize:
1, vision signal analogue transmission in m road is to the Video processing center, goes into the analog video switch that n goes out through m, and (analog video signal of m＞n) is in display device on input n road.
2, m road vision signal is through after the digital coding, be transferred to the video decode on process m road, Video processing center through communication network after, the video analog signal on output m road is gone into n through m and goes out that (the analog video switch of m＞n), output n road analog video signal is in display device again.
In long-range processing system for video, more than two kinds of methods all have certain defective, make a concrete analysis of as follows:
For above-mentioned first method, owing to adopt the analog line transmission, so the bandwidth of transmission line is had higher requirement.For example for the vision signal of PAL (line-by-line inversion) standard, vision bandwidth is about 6.5M, generally is unsuitable for long-distance transmissions for such signal, otherwise will increase expensive transmission equipment.Owing to adopt the analog video switch, being signal and ground for non-equilibrium transmission means in addition, is the anodal and signal negative pole of signal for the balance transmission mode, so each vision signal must be through twice switching.And the cost of simulation switching matrix is higher, because it often will consider the impedance of circuit and the problems such as driving force of circuit, and volume is generally bigger than normal, will make that like this m road analog video signal of input can not be too many, be that m can not be too big, so the Video processing ability at Video processing center has been formed restriction.
In above-mentioned second method, the Digital Transmission and the digital encoding and decoding technique of vision signal have been adopted, thereby transfer bandwidth is greatly descended, greatly reduce transmission cost, but because the cost of image decoder is generally also higher, therefore when the difference of the n road signal of the m road signal of input and output promptly the value of (m-n) also can make the cost of system high greatly the time.And because the video switcher that adopts remains the analog video switch, so can run into problem same in the first method.
The objective of the invention is to change in the past video transmission and the mode of video switch, the method that adopts digital video transmission and digital video to switch, so that reduce the cost of video transmission and video decode, improve simultaneously the capacity of video switch greatly, be particularly suitable for large-scale video monitoring system, video centralized monitoring system as telecommunications room, the video centralized monitoring system of electric power system, the video monitoring system of wireless base station, the video monitoring system of banking system, the video centralized monitoring system in the post business Room, the video centralized monitoring system of political affairs certificate exchange etc.
Purpose of the present invention is to reduce video transmission equipment or the video decoding apparatus in the processing system for video on the one hand.Because video transmission equipment and video decoding apparatus all are parts relatively more expensive in the processing system for video, therefore when the number of video acquisition point is far longer than the number of video display apparatus, the present invention can save a large amount of video transmission equipments and video decoding apparatus, thereby greatly reduces the cost of whole system.
Purpose of the present invention also is to improve the capacity of video switcher switching matrix on the other hand, promptly comparatively cheap and feasible scheme increases the quantity of video switcher input and output simultaneously with one, and still be choke free switching mode, provide convenient road for modern large-scale processing system for video like this.
The present invention also aims to utilize bandwidth vacant in the transmission line.Owing to adopted digitized video switch technology, so video switch its content for system is controlled, and for the portions of bandwidth of not utilizing fully in the video line, system is available like this.System can use these bandwidth to carry out other purposes, and as data communication or voice delivery, and as system maintenance and escape way, this treatment system for large-scale synthesis has important use and is worth.
The video communication of total digitalization of the present invention and the purpose of video switching method are to realize like this, at first after naming a person for a particular job the analog video signal process video coding that collects, m video acquisition transfer m way word signal to, transfer to the Video processing center by digital communication network again, and processing output n roads such as process video decode, switching (m＞n) to video display apparatus.After m way word vision signal is transferred to the Video processing center through digital communication network,, carry out according to following steps: digital video signal is switched by the digital video switch before the analog video signal of video display apparatus output n road; Digital video signal after switching is carried out video decode by Video Decoder, and to video display apparatus output analog video signal, the decoding process that this Video Decoder adopts is consistent with the video coding mode that video acquisition point video encoding device adopts.
In the process of digital video signal being switched by the digital video switch, m way word vision signal is switched to the n road (digital video signal of m＞n) through the digital video switch.Digital video switching mode of the present invention can be switched or empty branch switching of numeral or the combination of the two for digital time-division.When video switch adopts digital time-division to switch, can utilize idle bandwidth in the video link as the communication transparent channel, transferring voice or data also can be used as system maintenance and escape way.
The invention has the advantages that the video transmission that changed in the past and the mode of video switch, the method that adopts digital video transmission and digital video to switch, reduced the cost of video transmission and video decode, improve simultaneously the capacity of video switch greatly, be particularly suitable for large-scale video monitoring system, video centralized monitoring system as telecommunications room, the video centralized monitoring system of electric power system, the video monitoring system of wireless base station, the video monitoring system of banking system, the video centralized monitoring system in the post business Room, the video centralized monitoring system of political affairs certificate exchange etc.
Advantage of the present invention has been to reduce video transmission equipment or the video decoding apparatus in the processing system for video on the one hand.Because video transmission equipment and video decoding apparatus all are parts relatively more expensive in the processing system for video, therefore when the number of video acquisition point is far longer than the number of video display apparatus, the present invention can save a large amount of video transmission equipments and video decoding apparatus, thereby greatly reduces the cost of whole system.
Advantage of the present invention also is to have improved greatly the capacity of video switcher switching matrix on the other hand, promptly comparatively cheap and feasible scheme increases the quantity of video switcher input and output simultaneously with one, and still be choke free switching mode, provide convenient road for modern large-scale processing system for video like this.
The present invention be advantageous in that and to utilize bandwidth vacant in the transmission line.Owing to adopted digitized video switch technology, so video switch its content for system is controlled, and for the portions of bandwidth of not utilizing fully in the video line, system is available like this.System can use these bandwidth to carry out other purposes, and as data communication or voice delivery, and as system maintenance and escape way, this treatment system for large-scale synthesis has important use and is worth.
Description of drawings:
Fig. 1 has represented the complete simulated video transmission and the working method of video switch.
Fig. 2 has represented the working method of digitized video transmission and simulated video switch.
Fig. 3 has represented the totally digitilized video transmission and the working method of video switch.
Fig. 4 has represented the invention provides the method for supplementary service.
Below in conjunction with accompanying drawing, further specify characteristics of the present invention.
At first after naming a person for a particular job the analog video signal process video coding that collects, m video acquisition transfer m way word signal to, transfer to the Video processing center by digital communication network again, and processing output n roads such as process video decode, switching (m＞n) to video display apparatus.After m way word vision signal is transferred to the Video processing center through digital communication network,, carry out according to following steps: digital video signal is switched by the digital video switch before the analog video signal of video display apparatus output n road; Digital video signal after switching is carried out video decode by Video Decoder, and to video display apparatus output analog video signal, the decoding process that this Video Decoder adopts is consistent with the video coding mode that video acquisition point video encoding device adopts.
In the process of digital video signal being switched by the digital video switch, m way word vision signal is switched to the n road (digital video signal of m＞n) through the digital video switch.Digital video switching mode of the present invention can be switched or empty branch switching of numeral or the combination of the two for digital time-division.When video switch adopts digital time-division to switch, can utilize idle bandwidth in the video link as the communication transparent channel, transferring voice or data also can be used as system maintenance and escape way.
The present invention at first carries out video coding behind a plurality of video acquisition point video acquisitions, the purpose of doing like this is to compress for the redundancy section to vision signal, thereby the transmission bandwidth of video is reduced greatly, can utilize some comparatively economic transmission means to carry out video transmission like this.The method of video coding can be diversified, ITU (International Telecommunications Union)-T method for encoding images of regulation in the framework suggestion H.320 for example, ITU-T is the method for encoding images of regulation in the framework suggestion H.323, the image coding method that H.324 ITU-T stipulates among the image coding method of regulation and MPEG (Motion Picture Experts Group)-1, MPEG-2, the MPEG-4 in the framework suggestion etc.The principle of selecting is decided according to user's the needs and occasion or other factors of application.
The means of video transmission also can be diversified, for example can adopt special use/dialing MODEM (modulator-demodulator) circuit in E1 circuit, DDN (digital data service) circuit, PSTN (public switched telephone network) net, circuit, ATM (asynchronous transfer mode) net, local area network (LAN) circuit, ISDN (integrated services network) circuit etc. in PSPDN (public packet switching network) net to carry out the transmission of video.The principle of selecting is decided according to the actual bandwidth of image and the factors such as resource situation of local communication network.
When the digital signal transmission of a plurality of video acquisition points behind the Video processing center, at first these signals are carried out the coupling and the conversion of interface, the purpose of this Interface Matching is that the vision signal in the telecommunications network is taken out, remove the line coding signal, become a kind of digital signal such as NRZ (NRZ) coded signal of easy utilization.This moment, a plurality of vision signals became a kind of other signal, and promptly vision signal becomes one the tunnel by original multichannel (being generally two tunnel).This moment, a plurality of digital video signals were implemented handover operations, because the signal number that will switch descends (more than at least one times) greatly, and all signals are digital signal, so can adopt digital handoff technique, the actual signal number of switching are improved greatly.The method that numeral is switched also is diversified, can be that numeral is switched empty the branch, also can be that digital time-division switches, and can also be the combination of the two.Because the development of digital handoff technique (being similar to digital switching technology and digital crossover technology) is far ahead of simulation handoff technique (being similar to simulation space switching technology), and cost is than little many of the latter, therefore from capacity, price, reliability, digital handoff technique all has bigger advantage than the simulation handoff technique.
Input signal number and output signal number that setting video switches are respectively m and k, and then k road output signal can be divided and made two parts, respectively as two kinds of purposes.First kind is used to output to video decoding unit, and establishing its number is n.This scheme can be saved (m-n) individual decoding unit.It should be noted that the decoding process that the video decoding unit here adopts must be identical with the video coding mode that is monitored a little.For example the H.320 decoding method of regulation in the framework suggestion of ITU-T is adopted at two ends respectively.Signal behind the video switch also can be used for second kind of purposes, and the number of these signals is (k-n) road, can be used for the input signal of long-distance transmissions.This usage is in the multistage networking of vision signal is used or need picture signal to be transported to particularly suitable under the situation in a plurality of distances monitoring point far away.At first reduced (k-n) individual video encoding unit, secondly, vision signal is undamaged.This also is of the present invention one big advantage.
If when adopting the digital time-division handoff technique in digital video is switched, the present invention can also provide extra supplementary service.Because digital video signal not necessarily takies all bandwidth of transmission line in transmission, promptly may have idle component in the transmission line, and when digital time-division switched, vision signal and circuit thereof were controlled for system.Therefore, system can use the vacant circuit in the video link, the function of diversification more is provided, as being used to provide the transparent channel of data communication, can be used for transferring voice or data, also can be used as system maintenance and escape way etc., thereby greatly enrich the function of whole system.
Fig. 1 has represented the complete simulated video transmission and the working method of video switch.As can be seen, for m video acquisition point and n video display apparatus, under this working method, need m to communication interface, a m video encoding unit and m decoding unit.If implement the switching of m vision signal to n video display apparatus, the capacity that requires the analog video switch is that 2m goes into, 2n goes out, and supposes that here all vision signals are two end signals.
Fig. 2 has represented the working method of digitized video transmission and simulated video switch.As can be seen, for m video acquisition point and n video display apparatus, under this working method, need m to communication interface, a m video encoding unit and m video decoding unit.If implement the switching of m vision signal to n video display apparatus, the capacity that requires the analog video switch is that 2m goes into, 2n goes out, and supposes that here all vision signals are two end signals.
Fig. 3 has represented the totally digitilized video transmission and the working method of video switch.As can be seen,, under this working method, need m, m video encoding unit and n decoding unit to communication interface for m video acquisition point and n video display apparatus.If implement the switching that m vision signal arrives n video display apparatus, the capacity that requires the digital video switch is that m goes into n and goes out, and no matter vision signal is several end signals here.
Therefore can see, the present invention compare in the working method of full simulation, the cost of digital transmission equipment is far below analog transmission facility, the cost of digital switching device is far below the simulation switching device, and as will realize that big capacity is also much easier.The working method in Digital Transmission simulation switching that the present invention compares has been saved (m-n) individual decoding unit, and has replaced the analog video switching with the digital video switch unit, has reduced cost, and has realized big capacity easily, gets 64 as m, and n gets 32.
Empty frame table among Fig. 3 shows that generally this n unit may reside in the equipment, and visible integrated level of the present invention is quite high.
Fig. 4 has represented to adopt digitized video to switch other advantage.At first be the auxiliary activities function, this moment, system can utilize the idle bandwidth in the digital video signal circuit to carry out extra supplementary service, and these business can be configuration, management and the maintenance signal of transparent data passage, voice or system self and other.The digitized video handoff technique can also provide the relay function of digital video, in this uses, the terminal point of digital video signal can be leader, security personnel or other Video processing centers etc., and the characteristics of this mode are to need not video encoding unit and vision signal is lossless.
Claims (4)
1, Quan Shuozihua video communication and video switching method, at first after naming a person for a particular job the analog video signal process video coding that collects, m video acquisition transfer m way word signal to, transfer to the Video processing center by digital communication network again, handle output n road to video display apparatus through video decode, switching etc., m＞n, it is characterized in that: after m way word vision signal is transferred to the Video processing center through digital communication network, before the analog video signal of video display apparatus output n road, carry out according to following steps:
(1) by the digital video switch digital video signal is switched;
(2) digital video signal after will switching carries out video decode by Video Decoder, and to video display apparatus output analog video signal, the decoding process that this Video Decoder adopts is consistent with the video coding mode of video acquisition point video encoding device employing.
2, the video communication of total digitalization according to claim 1 and video switching method is characterized in that: described digital video switching mode can be switched or empty branch switching of numeral or the combination of the two for digital time-division.
3, the video communication of total digitalization according to claim 1 and video switching method is characterized in that: when video switch adopts digital time-division to switch, can utilize idle bandwidth in the video link as the communication transparent channel, transferring voice or data.
4, the video communication of total digitalization according to claim 1 and video switching method is characterized in that: when video switch adopts digital time-division to switch, can utilize idle bandwidth in the video link as system maintenance and escape way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113365 CN1108060C (en) | 1998-09-25 | 1998-09-25 | Fully digitalized video communication and video switching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113365 CN1108060C (en) | 1998-09-25 | 1998-09-25 | Fully digitalized video communication and video switching method |
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| CN1249626A CN1249626A (en) | 2000-04-05 |
| CN1108060C true CN1108060C (en) | 2003-05-07 |
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| CN 98113365 Expired - Fee Related CN1108060C (en) | 1998-09-25 | 1998-09-25 | Fully digitalized video communication and video switching method |
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| CN1333594C (en) * | 2003-06-23 | 2007-08-22 | 明基电通股份有限公司 | A system with dynamic video mode switching and transmission method |
| CN107612579A (en) * | 2017-10-24 | 2018-01-19 | 盐城师范学院 | The interim wireless transmitting system of foreign language teaching multi-channel video signal |
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Owner name: ZTE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHENZHENG CITY ZTE CO., LTD. |
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Address after: 518057 Zhongxing building, science and technology south road, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee after: ZTE Corporation Address before: 518004 Zhongxing building, science and technology south road, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee before: Zhongxing Communication Co., Ltd., Shenzhen City |
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Assignee: Shenzhen Lead Display Equipment Co., Ltd. Assignor: ZTE Corporation Contract record no.: 2011440020231 Denomination of invention: Fully digitalized video communication and video switching method Granted publication date: 20030507 License type: Exclusive License Open date: 20000405 Record date: 20110613 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030507 Termination date: 20170925 |