CN200962656Y - L wave band digital multimedia broadcast system - Google Patents
L wave band digital multimedia broadcast system Download PDFInfo
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- CN200962656Y CN200962656Y CN 200620047527 CN200620047527U CN200962656Y CN 200962656 Y CN200962656 Y CN 200962656Y CN 200620047527 CN200620047527 CN 200620047527 CN 200620047527 U CN200620047527 U CN 200620047527U CN 200962656 Y CN200962656 Y CN 200962656Y
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Abstract
The utility model provides a L-band digital multimedia broadcast system which comprises a front end subsystem and an emission subsystem, wherein in the front end subsystem a video signal source adopts international or domestic standard to compress and encode, an audio signal source adopts international or domestic standard to compress and encode, in the emission subsystem, a L-band frequency is used. In the metropolitan special environment, a plurality of emission subsystems forms a Single frequency network to cover. The L-band digital multimedia broadcast system of the utility model can realize transmission mellifluent video frequency and audio frequency multimedia information or the like, has short circle to establish system, low cost and high bandwidth utilization ratio.
Description
Technical field
The digital broadcasting of the utility model relate generally to is specifically related to DMB (DMB) system.
Background technology
Along with digital technology development with rapid changepl. never-ending changes and improvements, traditional radiated television transmission technology is also progressively developed to the digitlization direction by simulation, digitlization makes the new business of radio and television emerge in an endless stream, and DMB one of new application in this field just.The DMB technology is based on a kind of new application of digital audio broadcasting (hereinafter to be referred as DAB) technology.The DAB technique functions comes from Europe, and many in the world at present countries and regions have obtained using widely.Some countries of Europe have set up the DAB network, wherein based on transmission data and audio frequency, are mainly used in fixing reception of family and vehicle-mounted mobile reception.Use the problem that the DAB technology can solve the broadcasting frequency famine, sound radio has been increased to more than 400 broadcasting frequency from more than 200 broadcasting frequencys, promote the development of music making industry and broadcast service widely.
Demand to instant messages in the international metropolis (for example Shanghai City) increases day by day, and can satisfying mobile crowd at present, to obtain the channel of information whenever and wherever possible varied, for example mobile communication, wireless network etc.Yet, owing to be subjected to the restriction of existing network bandwidth and terminal, can only obtain information by forms such as simple literal, pictures, can not see smooth video frequency program.
The utility model content
For addressing the above problem, the utility model proposes a kind of L-band DMB (DMB) system.This system utilizes the good transmission characteristic of DAB and incorporates the multimedia video program, can realize transmitting smooth multimedia messagess such as video, audio frequency and data, and the cycle that system sets up is short, and cost is low, the bandwidth availability ratio height.
L-band digital multimedia broadcasting system of the present utility model comprises continuous front terminal system and emission subsystem, and wherein, the front terminal system comprises: standard video encoder is used for according to standard video signal source being carried out compressed encoding; The packaging multiplexing device is connected with standard video encoder, be used for to the compressed encoding signal from standard video encoder pack, multiplexing, to form continuous packet; The standard audio encoder is used for audio signal source is compressed and encoding according to standard, to form audio data stream; With signal group multiplexer, be connected with the standard audio encoder with described packaging multiplexing device, be used for carrying out multiplexing to described continuous packet and audio data stream, to form the ETI signal flow of standard, the emission subsystem comprises: modulator is used for the ETI signal flow from the front terminal system is modulated into intermediate-freuqncy signal; Upconverter is connected with this modulator, is used for described intermediate-freuqncy signal up conversion is become the radiofrequency signal of required frequency; Distributor is connected with this upconverter, is used to distribute described radiofrequency signal; A plurality of independently power amplifier modules are connected with this distributor, and each radiofrequency signal that is used for distributing through this distributor is amplified to required power output respectively; Synthesizer is connected with described a plurality of power amplifier modules, is used for synthetic each amplifying signal from described a plurality of power amplifier modules, to form composite signal; Harmonic filter is connected with this synthesizer, is used for the unwanted frequency composition of the described composite signal of filtering; And antenna, be connected with this harmonic filter, be used to launch signal through this harmonic filter filtering, wherein, described upconverter becomes described intermediate-freuqncy signal up conversion the radiofrequency signal of L-band.
The application of L-band digital multimedia broadcasting system of the present utility model will provide a kind of effective instrument for the information requirement that the crowd is moved in the city, can solve radio and television simultaneously at moving the problem that receives.L-band digital multimedia broadcasting system of the present utility model waits other digital transmission technologies to compare with digital video broadcast-terrestrial (DVB-T), have that investment is low, cost performance is high, coverage effect good, Miniaturizable, power saving and can make full use of advantage such as existing frequency resource, adopt this technology can realize the portability receiver of the vehicle-mounted receiver of high-speed mobile, small-sized power saving and the mobile TV receiver that bundlees with mobile phone, especially have special advantages aspect transmission low code rate image, data and other integrated services.
Description of drawings
Fig. 1 is the schematic block diagram according to the front terminal system of L-band digital multimedia broadcasting system of the present utility model; And
Fig. 2 is the schematic block diagram according to the emission subsystem of L-band digital multimedia broadcasting system of the present utility model.
Embodiment
Describe embodiment with reference to the accompanying drawings in detail according to L-band digital multimedia broadcasting system of the present utility model.
L-band digital multimedia broadcasting system of the present utility model comprises front terminal system and emission subsystem.The front terminal system mainly be to the signal source of the audio program of having edited, video frequency program and data service compress, coding, processing such as multiplexing, form ETI (signal group coffret) signal flow and also send into the emission subsystem.The emission subsystem mainly is that the ETI signal flow of importing is carried out chnnel coding, modulation, launches by antenna, forms the signal overlay network in the specific region.
In the front terminal system of digital multimedia broadcasting system of the present utility model, look, audio signal source can adopt International or National standard to carry out compressed encoding, transmission mode selection enhancement mode stream mode, equipment interface adopts UDP/IP (User Datagram Protoco (UDP)/Internet protocol) mode.Particularly, in the front terminal system of L-band digital multimedia broadcasting system shown in Figure 1, video signal source earlier carries out compressed encoding through standard video encoder, send into the packing data multiplexer pack, multiplexing, send into ensemble (group) multiplexer with continuous data packet form.On the other hand, audio signal source compresses through the standard audio encoder and encodes, and forms audio data stream and sends into ensemble (group) multiplexer.In ensemble (group) multiplexer, form the ETI signal flow of standard to deliver to the emission subsystem.
In the emission subsystem of digital multimedia broadcasting system of the present utility model, use the frequency of L-band, compare traditional VHF (very high frequency(VHF)) frequency range, its loss is bigger.Simultaneously, consider in the big city that building is concentrated, density is high, overpass is around special circumstances such as (for example in Shanghai City) in the city center, the mode of employing single frequency network is transmitted covering.Particularly, in the emission subsystem of L-band digital multimedia broadcasting system shown in Figure 2, the ETI signal flow of input becomes intermediate-freuqncy signal through modulators modulate, becomes the radiofrequency signal of required frequency then through the upconverter up conversion.This radiofrequency signal offers a plurality of (for example 8) independently power amplifier module through distributor again, is amplified to required power output by each power amplifier module.The output of each power amplifier module offers harmonic filter after synthesizing through synthesizer.Unwanted frequency composition in this this composite signal of harmonic filter filtering, and filtered signal is delivered to antenna launch.
Aforesaid L-band digital multimedia broadcasting system of the present utility model has adopted up-to-date digital transmission system, and interference free performance is good, can eliminate noise and distortion in the transmission course; The transmitting power that the digital transmission subsystem needs is very little, helps energy savings and minimizing electromagnetic pollution, improves environment; Adopted high efficiency compress technique in the digital transmission system, improved the availability of frequency spectrum greatly, it both can transmit the sound radio program, can also transmit media streams such as Various types of data business, live image, video frequency program simultaneously.In addition, the utility model can be in conjunction with up-to-date UDP/IP technology, for signal transmission link provides interface flexibly.
Claims (5)
1. a L-band digital multimedia broadcasting system comprises continuous front terminal system and emission subsystem, wherein,
The front terminal system comprises:
Standard video encoder is used for according to standard video signal source being carried out compressed encoding;
The packaging multiplexing device is connected with standard video encoder, be used for to the compressed encoding signal from standard video encoder pack, multiplexing, to form continuous packet;
The standard audio encoder is used for audio signal source is compressed and encoding according to standard, to form audio data stream; And
Signal group multiplexer is connected with the standard audio encoder with described packaging multiplexing device, be used for described continuous packet and audio data stream are carried out multiplexing, forming the ETI signal flow of standard,
The emission subsystem comprises:
Modulator is used for the ETI signal flow from the front terminal system is modulated into intermediate-freuqncy signal;
Upconverter is connected with this modulator, is used for described intermediate-freuqncy signal up conversion is become the radiofrequency signal of required frequency;
Distributor is connected with this upconverter, is used to distribute described radiofrequency signal;
A plurality of independently power amplifier modules are connected with this distributor, and each radiofrequency signal that is used for distributing through this distributor is amplified to required power output respectively;
Synthesizer is connected with described a plurality of power amplifier modules, is used for synthetic each amplifying signal from described a plurality of power amplifier modules, to form composite signal;
Harmonic filter is connected with this synthesizer, is used for the unwanted frequency composition of the described composite signal of filtering; And
Antenna is connected with this harmonic filter, is used to launch the signal through this harmonic filter filtering,
Wherein, described upconverter becomes described intermediate-freuqncy signal up conversion the radiofrequency signal of L-band.
2. L-band digital multimedia broadcasting system according to claim 1 wherein, forms single frequency network by a plurality of described emission subsystems.
3. L-band digital multimedia broadcasting system according to claim 1 and 2, wherein, the signal transfer mode in the described front terminal system adopts the enhancement mode stream mode.
4. L-band digital multimedia broadcasting system according to claim 1 and 2, wherein, the equipment interface in the described front terminal system adopts the UDP/IP mode of standard.
5. L-band digital multimedia broadcasting system according to claim 3, wherein, the equipment interface in the described front terminal system adopts the UDP/IP mode of standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620047527 CN200962656Y (en) | 2006-11-06 | 2006-11-06 | L wave band digital multimedia broadcast system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620047527 CN200962656Y (en) | 2006-11-06 | 2006-11-06 | L wave band digital multimedia broadcast system |
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| CN200962656Y true CN200962656Y (en) | 2007-10-17 |
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| CN 200620047527 Expired - Fee Related CN200962656Y (en) | 2006-11-06 | 2006-11-06 | L wave band digital multimedia broadcast system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325505B (en) * | 2008-07-24 | 2010-06-16 | 中兴通讯股份有限公司 | Transmission method for multiplexed data flow |
| CN101835005A (en) * | 2010-04-08 | 2010-09-15 | 福建三元达通讯股份有限公司 | Liquid cooling transmitter system |
-
2006
- 2006-11-06 CN CN 200620047527 patent/CN200962656Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325505B (en) * | 2008-07-24 | 2010-06-16 | 中兴通讯股份有限公司 | Transmission method for multiplexed data flow |
| CN101835005A (en) * | 2010-04-08 | 2010-09-15 | 福建三元达通讯股份有限公司 | Liquid cooling transmitter system |
| CN101835005B (en) * | 2010-04-08 | 2013-07-17 | 福建三元达通讯股份有限公司 | Liquid cooling transmitter system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071017 Termination date: 20121106 |