CN101998140A - Method for implementing access and distribution of digital audio/video signal in premise access network - Google Patents
Method for implementing access and distribution of digital audio/video signal in premise access network Download PDFInfo
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Abstract
The invention discloses a method for implementing access and distribution of a digital audio/video signal in a premise access network. The method comprises that: an audio/video signal lower than 100MHz is subjected to up-conversion to be merged with other digital audio/video downlink radio frequency signals into a path of electric signals in a downlink direction, and the path of electric signals are converted into optical signals and are shunted for output; a user service interface unit converts the received optical signals comprising audio/video information into electric signals, and the electric signals are subjected to filter amplification, are fed to an antenna through a feed line and are radiated to user equipment through; the user service interface unit filters and performs low-noise amplification on uplink audio/video radio frequency signals received by the antenna and converts the signals into optical signals for output in an uplink direction; and a service centralizing unit respectively converts at least one path of received audio/video information-containing optical signals into electric signals to be merged into a path, shunts a plurality of paths of audio/video radio frequency signals bearing the same service and transmits the audio/video radio frequency signals to each network information source, and the network information source selects a respectively corresponding network signal.
Description
Technical field
The present invention relates to communication technical field, relate in particular to and realize digital speech broadcasting and the technology that Digital Television merges in the user resident access network, specifically is a kind of method that realizes that digital audio-video signal inserts and distributes in station access network.
Background technology
First generation amplitude modulation (AM) broadcasting and second generation frequency modulation (FM) broadcasting successively develop after perfect and the extensive use, develop rapidly along with electronic technology, third generation audio broadcasting-digital audio broadcasting (Digital Audio Broadcasting, be called for short DAB) also in nearly 30 years, grow up, and ripe day by day.DAB can provide the sound that approaches the CD quality, broadcasting, additional packet data service, video signal, dynamically indicates, bulletin and mutual data, and have antinoise, anti-interference, anti-fading, near-zero distortion, be fit to many advantages such as high-speed mobile, promote broadcast service DMB (the Digital Multimedia Broadcasting that marches toward, DMB), be audio broadcasting development in future direction.
DMB (DMB) has merged communication and has broadcasted two kinds of technology, can be the user new concept Multimedia Mobile broadcast service is provided, except can supporting traditional high quality audio broadcasting, also can provide high-quality music and diversified data, services by several data forms such as MGEG-4.DMB comprise T-DMB (Terrestrial Multimedia Broadcasting, T-DMB) and digital multimedia broadcast (dmb) via satellite (S-DMB or DMB-S).Wherein, T-DMB is got up by the DAB system development, can provide the digital audio/video program to mobile phone, PDA and portable television; S-DMB need launch the function that special satellite is realized DMB, the S-DMB satellite of owning together as Korea S SKT telecommunications company and the Japanese mobile broadcast SBC of company.
As seen, along with the digitlization of voice broadcast service and public television, indicate these the two kinds popular professional bright prospects that possessed that in station access network, merge.All there is the unified demand that inserts public Voice Broadcast Service signal and vision signal at all user net areas, both can arbitrarily listen to, watch voice broadcast service, video broadcasting and/or television field frame, can pass through modern digital terminals such as digitized home, PDA (Personal Digital Assistant) (PDA), mobile phone again and realize interactively, learn, inquiry, interrogation, all audio frequency and video business service such as release news.By integrated services, provide immanent voice/video service to the user.
Particularly subway, length are apart from various places that can't receive radio signals such as tunnel, building inside, elevator inside, hardpoints.People require more and more higher to quality of the life, taking working clan that subway hurries along has beyond doubt and utilize this half an hour and even demand that more than one hour listens to the news program.
But present voice/video service is mainly provided at user net area construction telephone network and cable television network respectively by telecom operators and CATV (cable TV) operator.This not only causes the significant wastage of resource, and is not easy to operation maintenance, increases O﹠M cost, is difficult for capacity expansion and upgrading.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that realizes that digital audio-video signal inserts and distributes in station access network, merge at many nets of net area to realize voice broadcast service and public television signal.
For achieving the above object, the invention provides a kind of method that realizes that digital audio-video signal inserts and distributes in station access network, comprising:
On down direction, the audio-video signal that will be lower than 100MHz becomes radiofrequency signal through up-conversion, surveying the incoming traffic centralized unit with other digital audio/video downlink radio-frequency signal in information source, and merge into one road signal of telecommunication, is to export along separate routes behind the light signal with described one tunnel electrical signal conversion; The light signal that contains audio/video information that user business interface unit will receive is converted to the signal of telecommunication, after filtering is amplified, delivers to aerial radiation through feeder line and gives subscriber equipment;
On up direction, the up audio frequency and video radiofrequency signal that user business interface unit receives antenna is carried out filtering, low noise amplifies, and is converted to light signal output; After the light signal that audio/video information is contained at least one road that the service set unit will receive was converted to the signal of telecommunication and synthetic one tunnel respectively, demultiplexing complex tone video radiofrequency signal was delivered to each network information source again, selects each self-corresponding network signal by it; To be lower than the radiofrequency signal down-conversion of 100MHz simultaneously, deliver to corresponding network information source.
(TV signal that is lower than 100MHz needs prior frequency conversion by the merging of line transformer mixer in the service set unit by DAB signal, DMB signal and anolog TV signals etc. with different frequency in the present invention, change to more than the 100MHz), be transferred to the antenna of user business interface unit together through the service set unit with full optical fiber transmission network, be radiated to mobile subscriber's mobile phone and other-end.By this scheme, can unify to insert the digital audio-video signal that comprises DAB information, DMB information, many nets of realizing net area merge, thoroughly solve current overlapping investment, the repeated construction problem that is perplexing the common carrier senior executive, realize the Joint construction and sharing of the communications infrastructure, meet the state basic policy of building a conservation-minded society.And, before the audio frequency and video total digitalization,, the signal that is lower than 100MHz can be carried out up-conversion earlier if take into account the low side of broadcasting of intermediate waves analog radio and simulated television frequency range, change in the working frequency range of system; Because system transmission bandwidth is very wide, so according to user's request, also can be with other all public network signals below the 3GHz with DAB, the unified residence network that is linked into of DMB signal.
Description of drawings
Fig. 1 is the Access Network topological diagram that digital audio-video signal inserts in station access network and distributes in the embodiments of the invention;
Fig. 2 is the access distribution process method flow diagram that carries downstream signal in the professional station access network of digital audio/video in the embodiments of the invention;
Fig. 3 is the realization schematic diagram of service set unit in the embodiment of the invention;
Fig. 4 is the realization schematic diagram of user business interface unit in the embodiment of the invention.
Embodiment
Digital audio-video signal provided by the invention inserts in station access network and the method that distributes is used for being structured in digital audio/video transmission network signal and covers the system schema that distributes, in the transitional period, also can broadcast and simulated television by compatible analogue audio frequency simultaneously, solve the fusion problem of constructing and implementing of station access network with this.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the Access Network topological diagram that digital audio-video signal inserts in station access network and distributes in the embodiment of the invention, and information source comprises the diverse network information source of DAB, DMB etc. among the figure, and the mobile network's information source that inserts when needing; The user comprises mobile phone, PDA and PC and various user terminals etc. among the figure; Symbol "
" expression optical fiber; Symbol "
" the expression antenna.Specifically describe as follows:
The digital audio/video service signal inserts distributed network and is made up of service node, transmission node and user node.At professional convergence point (service node) the service set unit is set, its inner information source side is provided with the multichannel that constitutes with line transformer and closes/splitter, and the working band wide ranges reaches 100MHz～3GHz.
The operating frequency range in China intermediate waves analog voice broadcasting station is divided into 28 frequency ranges, and low-limit frequency is 526.5kHz, and highest frequency reaches 26100kHz; Up to now, the existing TV station in whole nation sum surpasses 40,000, and operating frequency range is divided into 18 frequency ranges, and low-limit frequency is 48.5MHz, is up to 1492MHz; The working frequency range in digital audio broadcasting radio station: Britain adopts 217.5～230.0MHz (BandIII), and some countries adopt 1228～1575MHz (L Band), and the DAB of China adopts European standard Eureka 147; T-DMB (Terrestrial Multimedia Broadcasting, BandIII is adopted in working frequency range Beijing T-DMB), Guangdong, and L Band is adopted in Shanghai.This shows that the native system operating frequency range is applicable to unified DAB of access and T-DMB signal in residence network fully, realizes the fusion of two class public networks.
This network also can be admitted other public network signals in this frequency range.Before the audio frequency and video total digitalization, if take into account the low side of broadcasting of intermediate waves analog radio and simulated television frequency range, the signal that is lower than 100MHz can be carried out up-conversion earlier, change in the working frequency range of system.
Whole access distributed network is tree topology, and its scale depends on user node quantity, and the user node number need not transmission network less than 8 o'clock, and user business interface unit directly is connected to the service set unit by optical fiber; The user node number needed the one-level transmission node greater than 8 o'clock in the transmission network; Greater than 64 o'clock, need the secondary transport node; More user node needs more multistage transmission node.All digital audio/video information are sent to the antenna that user business interface unit joins together, through user business interface unit, full optical fiber transmission network, service set unit, the splitter that constitutes by the line transformer of the information source side of service set unit, demultiplexing compound radio-frequency signal is delivered to each information source, " take what one needs " by it, take out each self-corresponding network signal; Wherein be lower than the radiofrequency signal output of 100MHz after down-conversion is delivered to corresponding network information source after becoming the information source frequency again.
(TV signal that is lower than 100MHz needs prior frequency conversion by the merging of line transformer mixer in the service set unit for the DAB signal of descending different frequency, DMB signal and anolog TV signals, change to more than the 100MHz), be transferred to the antenna of user business interface unit together through the service set unit with full optical fiber transmission network, be radiated to mobile subscriber's mobile phone and other-end.
More than constructed station access network, can unify to insert the diverse network signal that comprises DAB information, DMB information, many nets of realizing net area merge, thoroughly solve current overlapping investment, the repeated construction problem that is perplexing the common carrier senior executive, realize the Joint construction and sharing of the communications infrastructure, meet the state basic policy of building a conservation-minded society.
In network configuration shown in Figure 1, processing method for descending digital audio-video signal is: the low-side signal that will be lower than the intermediate waves analog radio broadcasting of 100MHz and simulated television frequency range is after up-conversion becomes radiofrequency signal, with other digital audio/video downlink radio-frequency signals in information source side incoming traffic centralized unit, merge into one road compound radio-frequency signal of telecommunication by the line transformer mixer, again through electric light conversion becoming composite optical signal, be divided into the identical composite optical signal of maximum 8 road bearer services by optical branching device then, be sent to maximum 8 transmission units through optical fiber; Transmission unit converts light signal to the signal of telecommunication, after amplifying, compensation becomes light signal again by optical module, be divided into the identical light signal of maximum 8 road bearer services through optical branching device again, send into maximum 8 next stage transmission units or user business interface unit by optical fiber; User business interface unit becomes the signal of telecommunication to composite optical signal again, by filtering, the output of amplification back, delivers to the various user terminals such as DAB terminal, DMB terminal and mobile phone that aerial radiation is given the diverse network in respective coverage areas territory through feeder line; The radiofrequency signal that wherein is lower than 100MHz need be carried out down-conversion earlier, changes to the operating frequency of map network user terminal.
The processing of upward signal is: from various user terminal signals such as mobile phone, DAB, DMB terminals, be radiated to the antenna of user business interface unit with other audio frequency and video radiofrequency signals (signal that is lower than 100MHz needs up-conversion to become radiofrequency signal in the band system band), after low noise amplification, filtering, convert light signal to, send into transmission unit through optical fiber again; Transmission unit converts maximum 8 road composite optical signals to maximum 8 road signals of telecommunication through photoelectric transformer respectively, be merged into one tunnel compound electric signal through addition in twos then, after compensation is amplified, again convert composite optical signal to through electrical optical converter again, send into upper level transmission unit or service set unit through optical fiber; Photoelectric transformer in the service set unit converts maximum 8 road light signals to the signal of telecommunication respectively, (signal of telecommunication being closed the road here is because if do not convert signal of telecommunication addition earlier to close the Lu Chengyi road signal of telecommunication, but the direct addition of multipath light signal, can cause and interfere with each other), be divided into maximum 8 road compound radio-frequency service signals by the line transformer splitter then and deliver to corresponding information source network, " take what one needs " by it, take out radiofrequency signal separately; The radiofrequency signal that is lower than 100MHz also needs to become through down-conversion the frequency of corresponding information source, sends corresponding information source network back to.
For further specifying above handling process, set forth the processing method of downstream signal in the station access network of multi-service digital audio-video signals such as carrying DAB, DMB below in conjunction with Fig. 2.
Fig. 2 is the access distribution process method flow diagram that carries downstream signal in the professional station access network of digital audio/video in the embodiment of the invention, specifically may further comprise the steps:
Step 201, the intermediate waves analog radio broadcasting that will be lower than 100MHz and the low side source signal of simulated television frequency range become radiofrequency signal through up-conversion, then with the digital audio/video radiofrequency signal of other a plurality of information sources adjust level unanimous on the whole after, deliver to service set unit information source side corresponding input end.
Step 202, the radiofrequency signal of multiple standard is closed the road by the line transformer mixer; Then the signal that merges is carried out electro-optical conversion, (it is maximum 8 the tunnel that service set unit in the present embodiment and transmission unit are only made at present, can make more even number road in theory after optical branching device is divided into the output of 8 road light signals to become light signal.)。
More than two steps in the service set unit, finish, Fig. 3 is that it realizes schematic diagram, the first half among the figure realizes the processing to downstream signal, wherein, DMB3, FM and AM signal all are lower than 100MHz, need carry out upconversion process.DAB is a digital audio broadcasting signal, and different carrier frequencies is used in different digital audio broadcasting radio station, wherein has to be lower than 100MHz's; DMB is a digital multimedia broadcasting signal, and is the same with DAB, and different carrier frequencies is used in different DMB radio station, wherein has to be lower than 100MHz's; These three kinds of signals of TV/FM/AM are meant present analog TV broadcasting and amplitude modulation by tone broadcasting and FM broadcasting, have only descending and do not have up signal, in the transitional period, might have in residence network with DAB and DMB signal integration and unify the demand that inserts and distribute together.Monitoring module is responsible for monitoring the operating state of other module, and supply module is used for to electrical optical converter and photoelectric transformer power supply.
The light signal of step 203, multichannel output is delivered to the one-level transmission unit via optical fiber respectively.
Step 204, each road light signal be process light-to-current inversion in the one-level transmission unit respectively, becomes the signal of telecommunication and carry out electro-optical conversion again after compensation deals, becomes light signal again after optical branching device is divided into 8 tunnel outputs at the most.Optical branching device adopts existing commercialized device, is exactly the reverse use of optical combiner in fact; The line transformer splitter is made up of a plurality of line transformer two splitters, and it also is the reverse use of multiplexing line transformer mixer.
The light signal of step 205, each road output is delivered to the secondary transport unit via optical fiber respectively.
Step 206, each road light signal through light-to-current inversion, become the signal of telecommunication in corresponding secondary transport unit, the signal of telecommunication carries out electro-optical conversion after compensation deals, become light signal again after optical branching device is exported along separate routes.
As previously mentioned, the equipment disposition amount is here decided by user's request, determines whether needs one-level, secondary or more multistage transmission unit according to number of users.
Step 207, every road light signal are delivered to corresponding user business interface unit via optical fiber.
Step 208, in user business interface unit, light signal reverts to after radiofrequency signal filtering, compensation amplifies through light-to-current inversion, delivers to corresponding antenna through radio frequency cable, the user terminals such as various mobile network mobile phones of this area of coverage are given in radiation; Wherein be lower than the radiofrequency signal of 100MHz, carry out the signal that down-conversion becomes corresponding frequencies earlier, deliver to corresponding DAB, DMB user and/or other users.
Fig. 4 is the realization schematic diagram of user business interface unit, needs the down signals AM signal that do not draw among the figure.All user business interface units all can carry the business of identical type, because in the present invention, all nodes have identical bandwidth, can transmit the business information that kind is identical, total capacity is identical.
The access distribution process method and the downflow of upward signal are similar in the professional station access network of carrying digital audio/video, comprising:
As shown in Figure 4, from the up audio-video signal of various user terminals such as mobile phone, DAB, DMB terminal, be radiated to the antenna of user business interface unit, (downstream signal is on the way by Optical Fiber Transmission, and signal to noise ratio is higher through the low noise amplification; Upward signal is sent by user terminal, signal a little less than, adding that low noise amplifies is in order to improve receiving sensitivity) and filtering after, again the multichannel upward signal is synthesized one the tunnel by the line transformer mixer, and convert composite optical signal to by electrical optical converter, send into transmission unit through optical fiber again;
Transmission unit carries out light-to-current inversion through photoelectric transformer respectively earlier with the multichannel composite optical signal that receives, after becoming multichannel compound radio-frequency signal, close synthetic one road signal of telecommunication in road through in twos, after compensation is amplified, convert the signal of telecommunication to light signal again again, send into upper level transmission unit or service set unit through optical fiber by electrical optical converter;
The service set unit converts the multipath light signal that receives to the signal of telecommunication respectively, and close the road in twos and be merged into one road signal of telecommunication, deliver to each network information source by the identical compound radio-frequency signal of line transformer splitter demultiplexing content then, choose each self-corresponding network signal by it; Simultaneously, the radiofrequency signal that is lower than 100MHz becomes the frequency of corresponding information source through down-conversion, sends corresponding information source network back to.
Upward signal flow process and downstream signal flow process comparing class are seemingly, the two main difference is to need a plurality of photoelectric transformers in the service set unit and transmission unit when up, the multichannel uplink optical signal of each unit input is carried out light-to-current inversion respectively earlier, be merged into one road rf signal through mixer after becoming the signal of telecommunication.In the service set unit, this road synthetic signal of telecommunication becomes the identical compound radio-frequency signal of 8 tunnel contents to deliver to each information source network by the line transformer demultiplexer separates, " is taken what one needs " by it, takes out network signal separately; In transmission unit, this road synthetic signal of telecommunication becomes the output of one road light signal through electro-optical conversion again after compensation deals up.
By adopting above method, the access scheme that can unify to insert the various audio-video signals that comprise DAB, DMB is provided for the net area user, have high-quality, low cost, low electromagnetic pollution, to many advantages of environmental disruption minimum, finish access to various information services in this net area and pick out, carry and transmit and cover distributed function.
The present invention can overcome the many disadvantages of prior art, for example:
The present invention can be at indoor customization frequency, and the user business interface unit power output can be easy to controlled microwave and leak by software control, reduces and disturbs; Because the user business interface unit power output is constant, need not to carry out complicated power budget when the network capacity extension and transformation.
Secondly, can improve upstream noise by the preposition low noise amplifying technique of user business interface unit, but the quality of reception of elevator system.
Adopt optical fiber as connection cable, compare with radio frequency feed line, its small, flexible, price is low, is easy to construction, environmental architecture is destroyed can be reduced to minimum level, is convenient to coordinate the owner.And because optical fiber has the ultra broadband characteristic, when local customer needs the mobile communication service simultaneously, also can be at the professional tandem side while accessing mobile communication network signal of service set unit.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1. a method that realizes that digital audio-video signal inserts and distributes in station access network is characterized in that, comprising:
On down direction, the audio-video signal that will be lower than 100MHz becomes radiofrequency signal through up-conversion, surveying the incoming traffic centralized unit with other digital audio/video downlink radio-frequency signal in information source, and merge into one road signal of telecommunication, is to export along separate routes behind the light signal with described one tunnel electrical signal conversion; The light signal that contains audio/video information that user business interface unit will receive is converted to the signal of telecommunication, after filtering is amplified, delivers to aerial radiation through feeder line and gives subscriber equipment;
On up direction, the up audio frequency and video radiofrequency signal that user business interface unit receives antenna is carried out filtering, low noise amplifies, and is converted to light signal output; After the light signal that audio/video information is contained at least one road that the service set unit will receive was converted to the signal of telecommunication and synthetic one tunnel respectively, demultiplexing complex tone video radiofrequency signal was delivered to each network information source again, selects each self-corresponding network signal by it; To be lower than the radiofrequency signal down-conversion of 100MHz simultaneously, deliver to corresponding network information source.
2. method according to claim 1 is characterized in that, this method further comprises on down direction:
The light signal that contains audio/video information that transmission unit will receive is converted to the signal of telecommunication, after signal compensation is handled, be converted to light signal again, and described light signal is divided into identical at least one road light signal outputs to next stage transmission unit or user business interface unit.
3. method according to claim 2 is characterized in that, this method further comprises on up direction:
The light signal that audio/video information is contained at least one road that transmission unit will receive is converted to the signal of telecommunication respectively, after signal compensation is handled, synthesize one road signal of telecommunication, and become light signal to be sent to upper level transmission unit or service set unit described one tunnel electrical signal conversion by optical fiber.
4. according to claim 2 or 3 described methods, it is characterized in that the equipment disposition amount of described transmission unit and rank configuration are determined according to the quantity of user business interface unit.
5.
According to claim 1,2 or 3 described methods, it is characterized in that, describedly on down direction, radiofrequency signal is merged into one road signal of telecommunication and comprise:
By the line transformer mixer radiofrequency signal of multiple standard is closed the road.
6. method according to claim 4 is characterized in that, when having multistage transmission unit in the system, transmission units at different levels are identical for the Signal Processing mode, and carrying transmission kind and the identical business of total capacity.
7. according to claim 1,2 or 3 described methods, it is characterized in that all user business interface units all can carry the identical business of kind.
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Application publication date: 20110330 |