CN1164108C - Multimedia digital transmission method and system - Google Patents
Multimedia digital transmission method and system Download PDFInfo
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- CN1164108C CN1164108C CNB991140230A CN99114023A CN1164108C CN 1164108 C CN1164108 C CN 1164108C CN B991140230 A CNB991140230 A CN B991140230A CN 99114023 A CN99114023 A CN 99114023A CN 1164108 C CN1164108 C CN 1164108C
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Abstract
The present invention uses RGB signals of an analog television as digital signals, and a coding device and a decoding device are respectively arranged on a transmitting end and a receiving end without installing new transmission devices to obtain more than 19.5Mbps of digital signal transmission rate in a 8MC television channel, so that an analog transmission system is conveniently updated to a multimedia digital transmission system. A cable television network can be based on a bus type topological structure after having the capability of two-way transmission, and with the high-speed calculation capability of a computer and the large transmission capacity of optic cables and coaxial cables, the cable television network ensures that each user of the network has own independent passage in each transmission stage. The present invention can develop a distributed digital telephone system.
Description
The present invention relates to the propagation of digital information, also relate to the communication and the telephonic communication of image information, relate in particular to the method and system that in optical cable and coaxial cable, carries out multimedia messages Digital Transmission such as image and voice.
The analogue system of message transmission is upgraded to the inexorable trend that digital system is technical development, and 21st century will be the epoch of a digitlization existence.For entire society, exploitation is needing of first affair towards the multimedia digital transmission system of hundreds of millions families, and it is the same for the effect of modernized human society that this is equivalent to the high-speed transit network.
Computer develops into local area network (LAN) from unit, arrives wide area network again, makes increasing user be shared information, shared resource, and to seem expense too high but network method is connected to huge numbers of families, at present still can't very fast enforcement.
The most noticeable development of nineteen nineties is popularizing rapidly of Internet, various countries fall over each other development, to enlarge its application, but because Internet is based upon on the telephone network basis, some weakness in sustainable development constantly reveals: it is crowded at first to be that the user causes more, someone says jokingly that WWW is " World Wide Wait (whole world is all being waited for) "; Secondly data is searched difficulty too much, and expense is also too high in addition.
At this problem, the design of " the 5th medium " is suggested, and promptly behind paper, broadcasting, TV, Internet, utilizes the outstanding transmittability of television channel again, makes it become a kind of digital public's medium.It can promote the information resources of flood tide, carries out personalized on-demand service, does not but have channel congestion, and is with low cost, can comprise above-mentioned four kinds of media on function.This is an information transmission system of directly leading to hundreds of millions families.
In China, Yi Shi, administrative region, county are that the cable TV network of coverage has more than 2000, and coverage rate reaches more than 50%, cable TV optical cable backbone length overall is above 100,000 kilometers, the cable length overall surpasses 1,500,000 kilometers, and the networking amount reaches 8,000 ten thousand families, and annual speed increase with 1,000 ten thousand families.Cable TV network becomes the highest information network of rate into family.Another advantage of cable television network is the bandwidth of registering one's residence, and is suitable for providing the broadband feature business, and its message transmission rate is more than hundred times of present public telephone network.
The broadband access scheme of registering one's residence based on twisted pair telephone has two, and one is N-ISDN.The N-ISDN service rate can reach 128Kbps, but still does not satisfy the requirement of broadband access; Another scheme then is to adopt XDSL, this class technology can be widened the transmission bandwidth of twisted pair telephone, make it that speed reaches several Mbps in several kilometer range, but every subscribers feeder must be adorned an adapter respectively at user side and exchange, cost an arm and a leg, and a large number of users is attached to how to exchange a problem that remains after the exchange.
Increasing multimedia service requires user access networks must satisfy the transmission demand of dynamic video image.The speed that this means user access networks should be high two more than the order of magnitude than telephone modem.On technical price and performance, the existing twisted pair telephone net of registering one's residence obviously can not meet the demands.The present invention is with the simulated television on the ordinary meaning red, green, blue (R, G, B) signal, being used as digital signal uses, thereby easily the analog television transmission system directly is upgraded to the multimedia digital transmission system, for digital broadcasting, Digital Television, transfer of data, digital telephone etc. provide huge, quick, a cheap digital transmission system.
The cable television network of China is to set up on blank fully basis, and it is started late, but development is very rapid, and network spectrum is constantly widened.The system frequently from the earliest all-channel system development to the neighbour has improved spectrum utilization efficiency, and neighborhood system then carries out the transition to 450MHz by 300MHz, develops into the 550MHz that generally adopts today, and fiber optic backbone has arrived 750MHz; The system of 1GHz also in test.Corresponding with it is the expansion that transmits the television channel capacity, from 27 cover (PAL-D) standards of 300MHz system, expands to 46 covers of 450MHz system, and to 59 covers of 550MHz system, the HFC net becomes the main flow of network development.
On digital transmission system, multimedia has comprised various aspects such as sound, image, literal, information, so the multimedia digital transmission system also is the best basis of Digital Television naturally.
Since the beginning high definition TV research of early seventies Japan, each state of west all inclines and develops with all strength, regards it as the 21st century rising industry that has a high potential.Digital technology has obtained development at full speed in recent ten years, and radio and television are from the simulation-to-digital technical development.Last Nov, the U.S. existing more than 20 tame TV stations broadcasted the quality high-definition television programs, and before being decided by 2006, all TVs from the collection of information, be transmitted into and receive all implementation digital technologies.
But the equipment of radio and television is all simulated in recent decades, change digitlization into, is at present to replace the analog machine of use at present from buying expensive digital device abroad.Stipulate in cable digital TV broadcast system (DVB-C) standard that Digital Transmission is used qam mode in coaxial line.What come into operation at present is the QAM64 modulation, and this mode is different with the analogue transmission mode, therefore need another set of emission, transmission and receiving system, and this need spend up to several hundred billion even trillions of expense, is that present national power, the financial resources of the people are burdensome.Have so and cannot on the basis that makes full use of present analog transmission facility, particularly cable television system, come transmission of digital signals?
The present invention seeks to: a kind of novel multimedia digital information transferring method and system are provided, especially in optical cable and coaxial cable, carry out the method and system of multimedia messages Digital Transmission such as image and voice.
The present invention also aims to: with the simulated television on the ordinary meaning red, green, blue (R, G, B) signal, being used as digital signal uses, thereby easily the analog television transmission system directly is upgraded to the multimedia digital transmission system, for digital broadcasting, Digital Television, transfer of data, digital telephone etc. provide huge, quick, a cheap digital transmission system.
The objective of the invention is to: a kind of digital transmission system is provided, on the basis that utilizes computer high-speed computation ability and optical fiber with the huge transmittability of cable, do not change existing analog machine, just can the high-speed transfer digital signal, make existing analog television transmission network directly become the multimedia digital transmission system.
The present invention also aims to: on the basis that the TV network transmission of digital signals transmits, utilize the high-speed computation ability of computer, the huge transmission capacity of performance coaxial cable and optical cable, signal flow is separated uplink and downlink, replaces the telephone path exchange in the mode of directly seeking the user by address code.
The object of the present invention is achieved like this:
The method of digital information transmission is: under the control of transmitting terminal computer, the file that is ready for sending in the computer added necessary verification, control code after, frame by frame, row requires to form packets of information, send the transmission buffering area that sends card; When sending, computer begins to send order, send card just with the sweep speed of TV, the digital signal that sends buffering area is divided into three the tunnel, send the high speed D/A respectively, obtain corresponding TV simulation R, G, B signal, add lock-out pulse and be combined into vision signal, so just can give TV station as general processing television signals, after being modulated to required television channel, in wire cable or radio wave transmission, send with anolog TV signals.Under the control of receiving end computer, the tuner of television set receives this anolog TV signals, decomposite R, G, B signal and lock-out pulse with the existing-quality television signal processing method, again R, G, B are delivered to three high speed A devices respectively, convert corresponding digital signal to, deliver to the reception buffering area, from then on take out by computer then as information source.
The multimedia digital transmission system comprises TV letter Acquisition Circuit, and Acquisition Circuit comprises the real-time D/A switch circuit of TV signal, and TV signal compressor circuit, D/A switch circuit connect the binary code stream that TV analog rgb signal sends TV signal; Receiving terminal circuit comprises tuner receiving circuit, A/D converter, TV signal decompression circuit and computer, the high frequency tuner circuit of terminal is after the existing-quality television signal processing circuit, decomposite rgb signal and lock-out pulse, again RGB is connected three high speed A devices respectively, convert digital signal one to one to, recover corresponding binary code stream, connect the TV signal decompression circuit, the vision signal of output TV.
Further application of the present invention is:
Method to the digital information transmission of TV is: with the TV Signal Collection Technology the real-time topotype/number conversion of TV signal is become digital information, with sending into computer after the MPEG2 compression, form the binary code stream of TV signal, (image collection card of American I nnovaCom company can be finished said process) send the transmission buffering area that sends card; With the same flow process of digital data transmission, this binary code stream translation, combination back are sent as anolog TV signals then.
Under the control of receiving end computer, the flow process same with digital data transmission converts the anolog TV signals that receive to digital signal, after handling, recover corresponding binary code stream, to the binary code stream of this TV signal with the VCD same method of behind read data on the CD, decoding, with the MPEG2 decompress(ion), form the vision signal of TV more again, deliver to television set and show.
Application of the present invention also comprises the digit transmission method to multimedia messagess such as voice: transfer of data is a transmission medium with optical cable or coaxial cable, wherein uplink and downlink are separately, the terminal of every microprocessor control is connected in line up and down, the method that uplink and downlink separate be adopt common frequency division or the time separating method, and be set at multi-level message transmission, the data of each level at first concentrate on this level transmission, and the address code of being sent out according to each terminal by passage letter controller between the direction of data and the levels time decides.
Its basic principle is:
The operation principle of TV is the colourity and the luminance signal of producing red, green, blue (R, G, B) three primary colors respectively, through matrix circuit, adds lock-out pulse, is combined into TV signal, by wire cable or radio wave transmission.After receiver demodulates TV signal, be recovered to the colourity and the luminance signal of red, green, blue three primary colors.
Native system is the corresponding one by one red, green, blue of digital signal (R, G, B) tristimulus signals, becomes digital signal at demodulating end with red, green, blue (R, G, B) tristimulus signals are corresponding one by one again.So, facility has been transmitted digital signal with analog television channel.
Its corresponding relation is as follows:
D1--R R--D1
D2--G-------TV signal--------G--D2
D3--B B--D3
Characteristics of the present invention are: on the basis that the TV network transmission of digital signals transmits, utilize the high-speed computation ability of computer, the huge transmission capacity of performance coaxial cable and optical cable, signal flow is separated uplink and downlink, replace the telephone path exchange in the mode of directly seeking the user by address code, the function of exchange of telephone system is shared each phone parts, cancelled center switch, avoided the circuit in the transmission course to stop up, thereby can improve the performance of telephone system, greatly reduce the manufacturing price of whole telephone system, make its cost, ability, expansion, safeguard, reliability all get a qualitative improvement.Application of the present invention can make the propagation velocity of digital information improve greatly, can reach the transmission rate more than the 19.5Mbps in a 8MC analog television channels.Utilize the present invention can be enough to implement the transmission plan of HD digital TV, need not huge equipment investment, be a feasible program of reducing investment outlay greatly, and utilize optical cable and the hfc transport system that has made full use of existing cable TV in the up-downgoing scheme of optical cable and transmission over coaxial cable multimedia messages especially.
The invention will be further described below in conjunction with accompanying drawing and by embodiment:
Fig. 1 is the TV signal transfer process block diagram corresponding with digital signal among the present invention
Fig. 2 is the system configuration schematic diagram of Digital Television transmitting terminal among the present invention
Fig. 3 is the system configuration schematic diagram of digital television receiving terminal among the present invention
Fig. 4 among the present invention to the Digital Transmission block diagram of multimedia messagess such as voice, transfer of data is a transmission medium with optical cable or coaxial cable, wherein uplink and downlink are separately.
As among Fig. 4 according to computer or the telephone terminal that in each 8MC simulated television frequency band, can control at present about 240.Every channel controller can be controlled the communication controller about 240, and the channel controller of a upper level can be controlled the channel controller of the next stage about 240, by that analogy.Only be confined to the operational capability of computer and the transmittability of optical cable.Provided the control schematic diagram of four levels among the figure,, can hold more than 30 hundred million computers or telephone terminals at most if adopt the address code of 32bit.Every can provide 64kbps not have the obstruction digital transmission capacity.
One, unidirectional Digital Transmission
Referring to block diagram among Fig. 1, under the control of transmitting terminal computer, the file that is ready for sending in the computer added necessary verification, control code after, frame by frame, row requires to form packets of information, send the transmission buffering area that sends card; When sending, computer begins to send order, send card just with the sweep speed of TV, the digital signal that sends buffering area is divided into three the tunnel, send the high speed D/A respectively, obtain corresponding TV simulation R, G, B signal, add lock-out pulse and be combined into vision signal, so just can give TV station as general processing television signals, after being modulated to required television channel, in wire cable or radio wave transmission, send with anolog TV signals.
Under the control of receiving end computer, the tuner of television set receives this anolog TV signals, decomposite R, G, B signal and lock-out pulse with the existing-quality television signal processing method, again R, G, B are delivered to three high speed A devices respectively, convert corresponding digital signal to, deliver to the reception buffering area, from then on take out by computer then, handle respectively as the case may be.
In a 8MC analog television channels, can reach the transmission rate more than the 19.5Mbps.
Two, digital television transfer:
Referring to Fig. 2 and Fig. 3, with the TV Signal Collection Technology the real-time topotype/number conversion of TV signal is become digital information, with sending into computer after the MPEG2 compression, form the binary code stream of TV signal, (image collection card of American I nnovaCom company can be finished said process) send the transmission buffering area that sends card; With the same flow process of digital data transmission, this binary code stream translation, combination back are sent as anolog TV signals then.
Under the control of receiving end computer, the flow process same with digital data transmission converts the anolog TV signals that receive to digital signal, after handling, recover corresponding binary code stream, to the binary code stream of this TV signal with VCD method like the codec class behind read data on the CD, with the MPEG2 decompress(ion), form the vision signal of TV more again, deliver to television set and show.
In a 8MC analog television channels, can transmit high-definition television programs 3--6 cover.
Three. the bi-directional digital transmission
The transformation that cable television network is suitable in addition, become the two-way multimedia digital transmission system that is based upon on the bus type topological structure basis, utilize the high-speed computation ability of computer, the huge transmittability of performance optical cable and coaxial cable makes each terminal use of network on each level of transmission oneself independently passage be arranged all.Each terminal can be computer, also can be voice, image or other multimedia terminal.Therefore information flow can not produce obstruction, thereby solved the key issue of present communication network--" bottleneck problem ", bi-directional digital transfer function with almost infinitely extendible (being only limited to the operational capability of computer and the transmittability of optical cable), be the Internet net, digital communication network provides solid foundation.Fig. 4 and explanation thereof have provided embodiment, but the control that relates to communication and information flow thereof needs computer software, and can adopt existing communications protocol is the computer programming system of basic framework.
The method of bi-directional digital transmission is:
Transfer of data is separated with uplink and downlink, and be provided with multi-levels data transmission control, the data of each level at first concentrate on the transmission of this level, the communication controller connecting terminal computerized telephone of this level, the direction of data are then decided by the address code that passage letter controller is sent out according to each terminal.Transfer of data between level and the level is by realizing between the channel controller.Be located at according to ground floor, transmission rate is more than the 19.5Mbps; At the second layer, transmission rate is up to more than the 4.686Gbps, can hold No. 57600 phones, and China has realized 24 ten thousand tunnel circuit transmission on a pair of optical cable; At the 3rd layer, transmission rate is up to more than the 1123.2Gbps, can hold 1382.4 No. ten thousand phones.The optical cable that U.S. Lucent company lays will have the 400Gbps capacity, can hold 600 No. ten thousand phones.
Because the huge transmission capacity of optical cable, each terminal all can be occupied the passage of oneself at all levels, so transfer of data can not stop up because of seizing, and the address code of 32bit just can provide the virtual circuit up to more than 30 hundred million 64K transmission rates.
Four. digital telephone
Present telephone system is to be the radial one by one huge separate network that the center is formed with the switch, the distributed digital telephone system is then after cable television network has two-way transmission capabilities, in two 8MC simulated television frequency bands, can be the transmission rate that data provides 8 T1, both 240 way word phones.
Distributed digital telephone system method is:
On the basis that the TV network transmission of digital signals transmits, utilize the high-speed computation ability of computer, the huge transmission capacity of performance coaxial cable and optical cable, signal flow is separated uplink and downlink, replace the telephone path exchange in the mode of directly seeking the user by address code, the function of exchange of telephone system is shared each phone parts, cancelled center switch, avoided the circuit in the transmission course to stop up, thereby can improve the performance of telephone system, greatly reduce the manufacturing price of whole telephone system, make its cost, ability, expansion, safeguard, reliability all get a qualitative improvement.
Native system mainly contains three parts and forms: computerized telephone, communication controler, channel controller.
Computerized telephone: send and receive signaling moiety, send and receive the data in the transmission channel, voice signal is carried out modulus or digital-to-analogue conversion and button handle.
Communication controler: processing signaling signal, the direction of decision voice signal.
Channel controller: the control of voice signal direction.
Digital telephone is a special case of the method for bi-directional digital transmission in fact just.
Claims (2)
1, a kind of multimedia digital transmission method: it is characterized in that under the control of transmitting terminal computer, the file that is ready for sending in the computer is added necessary verification, control code after, frame by frame, row requires to form packets of information, send the transmission buffering area that sends card; When sending, computer begins to send order, send card just with the sweep speed of TV, the digital signal that sends buffering area is divided into three the tunnel, send the high speed D/A respectively, obtain corresponding TV simulation R, G, B signal, add lock-out pulse and be combined into vision signal, be modulated to required frequency, in wire cable or radio wave transmission, send with anolog TV signals; Under the control of receiving end computer, the tuner of terminal receives this anolog TV signals, decomposite R, G, B signal and lock-out pulse with the existing-quality television signal processing method, again R, G, B are delivered to three high speed A devices respectively, convert digital signal one to one to, thereby utilize the analog television transmission system directly to realize Digital Transmission.
2, by the described multimedia digital transmission method of claim 1, it is characterized in that: the real-time topotype/number conversion of TV signal is become digital information with the TV Signal Collection Technology, with sending into computer after the TV signal compression, form the binary code stream of TV signal, send the transmission buffering area that sends card; With the same flow process of digital data transmission, this binary code stream translation, combination back are sent as anolog TV signals then; Under the control of receiving end computer, the flow process same with digital data transmission converts the anolog TV signals that receive to digital signal, after handling, recover corresponding binary code stream, behind the TV signal decompress(ion), form the vision signal of TV more again, deliver to television set and show.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991140230A CN1164108C (en) | 1999-01-21 | 1999-01-21 | Multimedia digital transmission method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991140230A CN1164108C (en) | 1999-01-21 | 1999-01-21 | Multimedia digital transmission method and system |
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| Publication Number | Publication Date |
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| CN1261240A CN1261240A (en) | 2000-07-26 |
| CN1164108C true CN1164108C (en) | 2004-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB991140230A Expired - Fee Related CN1164108C (en) | 1999-01-21 | 1999-01-21 | Multimedia digital transmission method and system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3689063B2 (en) * | 2002-04-19 | 2005-08-31 | 松下電器産業株式会社 | Data receiving apparatus and data distribution system |
| US10021161B2 (en) * | 2014-11-05 | 2018-07-10 | Qualcomm Incorporated | Compression of graphical commands for remote display |
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1999
- 1999-01-21 CN CNB991140230A patent/CN1164108C/en not_active Expired - Fee Related
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| CN1261240A (en) | 2000-07-26 |
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