CN207251822U - A kind of terrestrial DTV covers system - Google Patents
A kind of terrestrial DTV covers system Download PDFInfo
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- CN207251822U CN207251822U CN201721176509.7U CN201721176509U CN207251822U CN 207251822 U CN207251822 U CN 207251822U CN 201721176509 U CN201721176509 U CN 201721176509U CN 207251822 U CN207251822 U CN 207251822U
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Abstract
The utility model discloses a kind of terrestrial DTV to cover system, including center covering engineering ground system of digital television broadcast and local ground digital television broadcasting mono-frequency network system, wherein covering engineering ground system of digital television broadcast purport in center carries out central television program covering in China, and local ground digital television broadcasting mono-frequency network system is divided into front end system, transmission link and covered ground network three parts.Wherein, video and audio message sink coding uses the AVS+ and DRA of China's autonomous innovation；And the principal mode using satellite link as transmission distribution network network；Satellite link is encrypted.The utility model uses the wireless digitizing covering engineering of the technology such as national digital television standard, combining wireless communication, IP networkings, Big Dipper time service, has facilitation for building DTV Ubiquitous Network nerve of a covering.
Description
Technical field
Wireless communication field is the utility model is related to, more particularly to a kind of terrestrial DTV covering system.
Background technology
It is well known that terrestrial television is the initial means of TV covering, it is the basic means of TV public service.At me
State, terrestrial television account for TV family total number of users about half the common people (1.8 hundred million family family) understand affairs in this world, enjoy entertainment life
Main tool, its digitize be implement universal service principle, eliminate " digital divide " an important means.Industry transformation adds
It hurry up, traditional CHINA RFTCOM Co Ltd is facing unprecedented challenge and impact.Digitlization, networking, the intelligent structure tune brought
Whole and Overall Transformation problem is global.Information hierarchy, open competition, will be China's television network broadcast development in order steadily
New normality.DTV is the intersection hot spot of information technology, Internet technology and media industry, is that global economy and science and technology are competing
One of principal focal point striven.The development of sized enterprises in chinese DTV industry will change traditional broadcast television industry operation mode, create new
Business model, by the way that DTV is combined with the Internet, applications, Infotainment, communication, will produce the brand-new market space.
Digital TV network mainly includes three line DTV, terrestrial DTV, satellite digital TV important sets
Into part.Wherein, terrestrial wireless broadcast television network has that construction cost is low and the cycle is short, transmission capacity increase and is passed after digitlization
Transmission quality is high and can realize the advantages such as mobile reception, especially unique excellent in resistance major natural disasters, urgent broadcast etc.
Gesture, can become a pole of broadband access completely.According to the characteristics of industry technology development trend and industry development, future terrestrial number
Word TV will present rich media contents, immersion experience, ubiquitous overlay network, mixing social networks, intelligence experience terminal, can
Manage the features such as controllable, the network architecture with " four fusion " --- it is wired with it is wireless merge, the merging of broadcasting and TV and telecommunications, interior
With it is outdoor merge, the fusion of various terminals.
Television network broadcast is to transmit broadcast TV program, carry out the important infrastructure of information service.By 2014
The second quarter, China TV family user are about 4.23 hundred million families, and wherein cable TV subscriber only has 1.6 hundred million families, also has more than 2.6
Hundred million families, especially rural area cannot receive cable television, and terrestrial DTV is still that this part population watches broadcast
One of main means of TV.
The end of the year 2014, national news publish General Bureau of Radio, Film and Television (hereinafter referred to as " general bureau ") and start to start implementation central broadcast comprehensively
The wireless digitizing covering engineering (hereinafter referred to as " specialty work ") of TV programme, amounts to about 47.56 hundred million yuan of construction fund.Broadcasting and TV are total
In the specialty work technical work meeting that science and technology department of office organizes, Wang Xiaojie directors profoundly elaborate the weight of this engineering
The property wanted and urgency.It is strategic transformation of the radiated television from analog to digital；It is the work that center is deepened the reforms in an all-round way
Deployment；It is the modern system of public cultural services of structure, strengthens us and publicize the general requirement of cultural front construction.It is central high
Degree is paid attention to, finance height is supported.
Ground system of digital television broadcast in the wireless digitizing covering of central broadcast TV programme is divided into front end system, passes
Transmission link and covered ground network three parts.Front end system provides the transport stream work of two-way totally 12 sets SD digital television programs
For signal source；The transmitting station being distributed to two-way transport stream by transmission link in covered ground network；Covered ground net
Each station of network uses two channels respectively, and with clear stream broadcast way, covering is transmitted using single frequency network or multiple frequency network, MFN.
Utility model content
The purpose of the utility model is to overcome the shortcomings that the prior art and insufficient, there is provided a kind of terrestrial DTV covering
System.
The purpose of this utility model is realized by following technical solution：
A kind of terrestrial DTV covers system, including center covering engineering ground system of digital television broadcast and locally
Digital videocast single-frequency network system, wherein
Center covering engineering ground system of digital television broadcast, including CCTV ground digital television broadcasts front end system,
Ball station, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching unit, more than one ground number
Word broadcast transmission system, wherein CCTV ground digital television broadcasts front end system transmits a signal to earth station respectively, code stream is cut
Unit is changed, earth station receives respectively to satellite transmission signal, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver
The signal that satellite is sent, transmission signal to code stream is cut respectively for satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver
Unit is changed, signal is transmitted separately to more than one received terrestrial digital broadcasting emission system by bitstreams switching unit again；
Local ground digital television broadcasting mono-frequency network system, including satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ are defended
Star receiver, code stream processing unit, bitstreams switching unit, multiplexer, single frequency adapter, more than one received terrestrial digital broadcasting
Emission system, wherein satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver receive the signal that satellite is sent respectively,
Satellite reception/AVS+ transcodings/Multiplexing Unit transmission signal to bitstreams switching unit, AVS+ satellite receiver are handled single by code stream
First transmission signal to bitstreams switching unit, bitstreams switching unit, multiplexer, single frequency adapter is sequentially connected, single frequency network adaptation
Device is connected with more than one received terrestrial digital broadcasting emission system respectively by program distribution network；The access of local program signal is multiple
Use device.
It should be noted that in covering engineering ground system of digital television broadcast in center, the CCTV ground number that is related to
Word television broadcasting front end system, earth station, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching
Unit, received terrestrial digital broadcasting emission system, these components be all it is existing, the creation point of the utility model be these components it
Between connection relation.
For example, satellite reception/AVS+ transcodings/Multiplexing Unit includes satellite receiver, AVS+ transcoding units, Multiplexing Unit,
Wherein satellite receiver is a kind of device that can receive satellite television programming, by parabola antenna, feed, tuner, satellite
Receiver forms, model Power Vu D9850；AVS+ transcoding units are each H.264, to realize by high definition AVS+ video code conversions
Transcoding requirement between kind video code model, model Linked-Video 9000；Multiplexing Unit answers different inlet flows
Use and transmitted in same physical channel, model FR-6000-CWDM-XX；
AVS+ satellite receiver, local signal, model DVB-S2 are converted to by satellite-signal；
Bitstreams switching unit, switches between different video code stream, model CSS100；
In local ground digital television broadcasting mono-frequency network system, satellite reception/AVS+ transcodings/multiplexing list for being related to
Member, AVS+ satellite receiver, code stream processing unit, bitstreams switching unit, multiplexer, single frequency adapter, received terrestrial digital broadcasting
Emission system is similarly existing device, and the creation point of the utility model is the connection relation between these devices.Device
Reference use model, enumerated above, details are not described herein again.
In addition, center covering engineering ground system of digital television broadcast and local ground digital television broadcasting mono-frequency network system
In, identical component is all referred to, such as：Satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching
Unit, received terrestrial digital broadcasting emission system, these components are center covering engineering ground system of digital television broadcast and local
Ground digital television broadcast mono-frequency network system shares, so not being distinguish between nominally during front and rear description.
The earth station includes single frequency adapter, the DVB-S modulators being linked in sequence.
The single frequency network of the received terrestrial digital broadcasting emission system uses the ground digital television broadcast list based on optical fiber transmission
Frequency net, the ground digital television broadcast single frequency network based on microwave transmission, based on IP transmission ground digital television broadcast single frequency network,
One or more in ground digital television broadcast single frequency network based on satellite transmission.
The ground digital television broadcast single frequency network based on IP transmission includes single frequency adapter, upper end TSover IP
Gateway, more than one lower end TS over IP gateways, more than one transmitter, wherein single frequency adapter receive TS code streams
And upper end TS over IP gateways are transmitted to, upper end TS over IP gateways are transmitted IP code streams by program distribution network respectively
To more than one lower end TS over IP gateways, lower end TS over IP gateways are again by TS bit streams to connected hair
Penetrate machine.
The ground digital television broadcast single frequency network based on satellite transmission, its transmitter include radio frequency unit, control list
Member and power supply, wherein radio frequency part include master driver, standby driver, distributor, preamplifier, driving amplifier, final stage
Amplifier, synthesizer and channel filter, the wherein radiofrequency signal of TS code streams are switched over by master driver, standby driver,
Then distributor, preamplifier, driving amplifier, final amplifier is passed sequentially through respectively to be amplified the radiofrequency signal,
Amplified radiofrequency signal carries out power combing in the combiner, finally exports radiofrequency signal after channel filter filters；
Control unit, is controlled transmitter according to the signal of each detection, protects and presentation of information.Transmitter has standing wave
Than protection, temperature alarming, wind turbine cooling control and overpower protection；Presentation of information is configured and works to the parameter of transmitter
Status information is shown.
The preamplifier is two-stage preamplifier, and driving amplifier is No. three driving amplifiers, final amplifier
For No. six final amplifiers, synthesizer is No. six synthesizers.
The utility model compared with prior art, has the following advantages that and beneficial effect：
The utility model uses national digital television standard, builds the technologies such as combining wireless communication, IP networkings, Big Dipper time service
Wireless digitizing covering engineering, by the Internet, applications technological innovation, develop open, standardization, support mobile radio communication,
The terrestrial DTV covering system of internet, for building DTV Ubiquitous Network nerve of a covering, promotes broadcasting and TV program to propagate
Interconnection networking, meet government policy publicity, public sentiment management requirement, realize equality of public services, finally grasp ideology
Publicity position, promote socialist civilization System Construction there is important social effect.
Brief description of the drawings
Fig. 1 is the structure diagram of covering engineering ground system of digital television broadcast in center described in the utility model.
Fig. 2 is the structure diagram of local ground digital television broadcasting mono-frequency network system described in the utility model.
Fig. 3 is the structure diagram of the ground digital television broadcast single frequency network described in the utility model based on IP transmission.
Fig. 4 is the structure diagram of the ground digital television broadcast single frequency network described in the utility model based on satellite transmission.
Embodiment
The utility model is described in further detail with reference to embodiment and attached drawing, but the implementation of the utility model
Mode not limited to this.
A kind of terrestrial DTV covers system, including center covering engineering ground system of digital television broadcast and locally
Digital videocast single-frequency network system, wherein
Such as Fig. 1, center covering engineering ground system of digital television broadcast, including CCTV ground digital television broadcasts front end system
It is system, earth station, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching unit, more than one
Face digital broadcast transmitting system, wherein CCTV ground digital television broadcasts front end system transmit a signal to earth station, code respectively
Switch unit is flowed, earth station is distinguished to satellite transmission signal, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver
The signal that satellite is sent is received, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver distinguish transmission signal to code
Switch unit is flowed, signal is transmitted separately to more than one received terrestrial digital broadcasting emission system by bitstreams switching unit again；
Such as Fig. 2, local ground digital television broadcasting mono-frequency network system, including satellite reception/AVS+ transcodings/Multiplexing Unit,
AVS+ satellite receiver, code stream processing unit, bitstreams switching unit, multiplexer, single frequency adapter, more than one ground number
Word broadcast transmission system, wherein satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver receive satellite and send respectively
Signal, satellite reception/AVS+ transcodings/Multiplexing Unit transmission signal to bitstreams switching unit, AVS+ satellite receiver passes through code
Stream processing unit transmission signal to bitstreams switching unit, bitstreams switching unit, multiplexer, single frequency adapter is sequentially connected, single
Frequency net adapter is connected with more than one received terrestrial digital broadcasting emission system respectively by program distribution network；Local program is believed
Number couple in multiplexer.
It should be noted that in covering engineering ground system of digital television broadcast in center, the CCTV ground number that is related to
Word television broadcasting front end system, earth station, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching
Unit, received terrestrial digital broadcasting emission system, these components be all it is existing, the creation point of the utility model be these components it
Between connection relation.
For example, satellite reception/AVS+ transcodings/Multiplexing Unit includes satellite receiver, AVS+ transcoding units, Multiplexing Unit,
Wherein satellite receiver is a kind of device that can receive satellite television programming, by parabola antenna, feed, tuner, satellite
Receiver forms, model Power Vu D9850；AVS+ transcoding units are each H.264, to realize by high definition AVS+ video code conversions
Transcoding requirement between kind video code model, model Linked-Video 9000；Multiplexing Unit answers different inlet flows
Use and transmitted in same physical channel, model FR-6000-CWDM-XX；
AVS+ satellite receiver, local signal, model DVB-S2 are converted to by satellite-signal；
Bitstreams switching unit, switches between different video code stream, model CSS100；
In local ground digital television broadcasting mono-frequency network system, satellite reception/AVS+ transcodings/multiplexing list for being related to
Member, AVS+ satellite receiver, code stream processing unit, bitstreams switching unit, multiplexer, single frequency adapter, received terrestrial digital broadcasting
Emission system is similarly existing device, and the creation point of the utility model is the connection relation between these devices.Device
Reference use model, enumerated above, details are not described herein again.
In addition, center covering engineering ground system of digital television broadcast and local ground digital television broadcasting mono-frequency network system
In, identical component is all referred to, such as：Satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching
Unit, received terrestrial digital broadcasting emission system, these components are center covering engineering ground system of digital television broadcast and local
Ground digital television broadcast mono-frequency network system shares, so not being distinguish between nominally during front and rear description.
The earth station includes single frequency adapter, the DVB-S modulators being linked in sequence.
The single frequency network of the received terrestrial digital broadcasting emission system uses the ground digital television broadcast list based on optical fiber transmission
Frequency net, the ground digital television broadcast single frequency network based on microwave transmission, based on IP transmission ground digital television broadcast single frequency network,
One or more in ground digital television broadcast single frequency network based on satellite transmission.
Such as Fig. 3, the ground digital television broadcast single frequency network based on IP transmission includes single frequency adapter, upper end TS
Over IP gateways, more than one lower end TS over IP gateways, more than one transmitter, wherein single frequency adapter connect
Receive TS code streams and be simultaneously transmitted to upper end TS over IP gateways, upper end TS over IP gateways are by program distribution network by IP code streams
Be transmitted separately to more than one lower end TS over IP gateways, lower end TS over IP gateways again by TS bit streams to and its
The transmitter of connection.
Such as Fig. 4, the ground digital television broadcast single frequency network based on satellite transmission, its maximum feature is that it can have
The multi-path jamming of effect resistance wireless channel, therefore, ground system of digital television broadcast can realize number by setting up single frequency network
Effective covering of word TV signal.
Ground digital television broadcast single frequency network is positioned at different location, the terrestrial DTV in synchronous regime by multiple
The radio network of transmitter composition, with identical frequency, launches identical program controllable at the time of, to realize to special services
The reliable covering in area.
Time dissemination system provides unified clock reference (pulse per second (PPS)) and frequency reference for ground digital television single frequency network
(10MHz), is the key point of ground digital television single frequency network success structure.Importance in view of time dissemination system and
The stability of work, the time dissemination system of center covering engineering ground digital television single frequency network need to support global positioning system at the same time
(GPS) and two kinds of time service modes of dipper system (BD), and two kinds of time service modes can realize the switching of automatic seamless.
The UHF ground digital television transmitting systems of this project development mainly include：Ground digital television broadcast transmitter,
Face digital television broadcasting driver, the Big Dipper/GPS time dissemination systems etc..
The transmitter ground digital television broadcast transmitter includes radio frequency unit, control unit and power supply, wherein radio frequency
Part includes master driver, standby driver, distributor, preamplifier, driving amplifier, final amplifier, synthesizer and frequency
Channel filter, the wherein radiofrequency signal of TS code streams are switched over by master driver, standby driver, then pass sequentially through distribution
Device, preamplifier, driving amplifier, final amplifier are respectively amplified the radiofrequency signal, amplified radiofrequency signal
Power combing is carried out in the combiner, finally exports radiofrequency signal after channel filter filters；
Control unit, is controlled transmitter according to the signal of each detection, protects and presentation of information.Transmitter has standing wave
Than protection, temperature alarming, wind turbine cooling control and overpower protection；Presentation of information is configured and works to the parameter of transmitter
Status information is shown.
The preamplifier is two-stage preamplifier, and driving amplifier is No. three driving amplifiers, final amplifier
For No. six final amplifiers, synthesizer is No. six synthesizers.
The power supply uses Switching Power Supply, inputs 380V alternating currents, exports 50V direct currents, amplifies for power tube.In addition
Wind turbine takes 220V alternating currents.Mainly completed by electrical control circuit power of the whole machine part.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiment of the utility model and from above-mentioned
The limitation of embodiment, the change made under other any Spirit Essences and principle without departing from the utility model, modify, replace
Generation, combination, simplify, and should be equivalent substitute mode, is included within the scope of protection of the utility model.
Claims (6)
1. a kind of terrestrial DTV covers system, it is characterised in that：Including center covering engineering ground digital television broadcast system
System and local ground digital television broadcasting mono-frequency network system, wherein
Center covering engineering ground system of digital television broadcast, including CCTV ground digital television broadcasts front end system, earth station,
Satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver, bitstreams switching unit, more than one received terrestrial digital broadcasting
Emission system, wherein CCTV ground digital television broadcasts front end system transmit a signal to earth station, bitstreams switching unit respectively,
For earth station to satellite transmission signal, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver receive satellite hair respectively
The signal gone out, satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver difference transmission signal to bitstreams switching unit,
Signal is transmitted separately to more than one received terrestrial digital broadcasting emission system by bitstreams switching unit again；
Local ground digital television broadcasting mono-frequency network system, including satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellites connect
Receipts machine, code stream processing unit, bitstreams switching unit, multiplexer, single frequency adapter, the transmitting of more than one received terrestrial digital broadcasting
System, wherein satellite reception/AVS+ transcodings/Multiplexing Unit, AVS+ satellite receiver receive the signal that satellite is sent, satellite respectively
Reception/AVS+ transcodings/Multiplexing Unit transmission signal to bitstreams switching unit, AVS+ satellite receiver are passed by code stream processing unit
Defeated signal to bitstreams switching unit, bitstreams switching unit, multiplexer, single frequency adapter is sequentially connected, and single frequency adapter leads to
Program distribution network is crossed to be connected with more than one received terrestrial digital broadcasting emission system respectively；Local program signal access multiplexing
Device.
2. terrestrial DTV covering system according to claim 1, it is characterised in that：The earth station includes being linked in sequence
Single frequency adapter, DVB-S modulators.
3. terrestrial DTV covering system according to claim 1, it is characterised in that：The received terrestrial digital broadcasting transmitting system
The single frequency network of system uses the ground digital television broadcast single frequency network based on optical fiber transmission, the terrestrial DTV based on microwave transmission
Broadcast single frequency network, the ground digital television broadcast single frequency network based on IP transmission, the ground digital television broadcast based on satellite transmission
One or more in single frequency network.
4. terrestrial DTV covering system according to claim 3, it is characterised in that：The ground number based on IP transmission
Word television broadcasting single frequency network includes single frequency adapter, upper end TS over IP gateways, more than one lower end TS over IP
Gateway, more than one transmitter, wherein single frequency adapter receive TS code streams and are transmitted to upper end TS over IP gateways, on
IP code streams are transmitted separately to more than one lower end TS over IP networks by end TS over IP gateways by program distribution network
Close, lower end TS over IP gateways are again by TS bit streams to connected transmitter.
5. terrestrial DTV covering system according to claim 3, it is characterised in that：The ground based on satellite transmission
Digital television broadcasting single frequency network, its transmitter include radio frequency unit, control unit and power supply, and wherein radio frequency part includes master drive
Device, standby driver, distributor, preamplifier, driving amplifier, final amplifier, synthesizer and channel filter, wherein TS
The radiofrequency signal of code stream is switched over by master driver, standby driver, then passes sequentially through distributor, preamplifier, drive
Dynamic amplifier, final amplifier are respectively amplified the radiofrequency signal, and amplified radiofrequency signal carries out work(in the combiner
Rate synthesizes, and finally exports radiofrequency signal after channel filter filters；
Control unit, is controlled transmitter according to the signal of each detection, protects and presentation of information.
6. terrestrial DTV covering system according to claim 5, it is characterised in that：The preamplifier is before two-stage
Amplifier is put, driving amplifier is No. three driving amplifiers, and final amplifier is No. six final amplifiers, and synthesizer closes for six tunnels
Grow up to be a useful person.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176509.7U CN207251822U (en) | 2017-09-14 | 2017-09-14 | A kind of terrestrial DTV covers system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176509.7U CN207251822U (en) | 2017-09-14 | 2017-09-14 | A kind of terrestrial DTV covers system |
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| Publication Number | Publication Date |
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| CN207251822U true CN207251822U (en) | 2018-04-17 |
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ID=61888392
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| CN201721176509.7U Active CN207251822U (en) | 2017-09-14 | 2017-09-14 | A kind of terrestrial DTV covers system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714552A (en) * | 2019-02-21 | 2019-05-03 | 成都新光微波工程有限责任公司 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
-
2017
- 2017-09-14 CN CN201721176509.7U patent/CN207251822U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714552A (en) * | 2019-02-21 | 2019-05-03 | 成都新光微波工程有限责任公司 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
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