CN201409208Y - Multi-way microwave transmission device of digital television - Google Patents
Multi-way microwave transmission device of digital television Download PDFInfo
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- CN201409208Y CN201409208Y CN 200920140815 CN200920140815U CN201409208Y CN 201409208 Y CN201409208 Y CN 201409208Y CN 200920140815 CN200920140815 CN 200920140815 CN 200920140815 U CN200920140815 U CN 200920140815U CN 201409208 Y CN201409208 Y CN 201409208Y
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Abstract
The utility model provides a multi-way microwave transmission device of a digital television, which comprises a transmitting end and a receiving end; the transmitting end comprises a plurality of groups of satellite signal receiving ends and/or television signal receiving ends; a plurality of satellite receivers or a plurality of television signal input ports are arranged at each group of satellite signal receiving end and/or television signal receiving end and respectively coupled with a code-stream card and an encoder; the same group of satellite signal receiving end and/or television signalreceiving end is coupled with the same code-stream multiplexer, the digital modulator and the transmitter; and each group of transmitter is simultaneously coupled with a combiner with a transmittingantenna. The receiving antenna at the receiving end is connected with a low-noise amplifier, a down converter, a lower wave filter and a decoder, and then connected with a television signal output port. According to demands of a user, the transmitting end of each set of device is equipped with a plurality of receiving ends. The multi-way microwave transmission device also has a function indicationpart, and also comprises a switch control module, a data sampling module and a display screen; various detecting instruments are coupled with the data sampling module; and the indication of various functions is displayed on the display screen. The multi-way microwave transmission device has the advantages of realized digital signal transmission, strong interference resistance, remote transmissiondistance, low cost and popularization of television network in the city and countryside.
Description
(1) technical field
The utility model relates to microwave band radio digital television signal and technical field of data transmission, is specially a kind of Digital Television multichannel microwave transmission equipment.
(2) technical background
Along with the arrival of information and digital Age, information and digital technology have obtained huge development, and Digital Television MMDS technology will replace the simulated television lift-off technology.Digital Television is that traditional anolog TV signals are changed into the digital signal of being made up of binary number through quantizing and encoding, then digital signal is carried out processing, transmission, storage and the record of various functions, in the transfer process of signal, also can handle, monitor and control with electronic computer.Analog television transmission has inevitable defective at present, for example amplify step by step and produce noise, produce after the long Distance Transmission that signal-to-noise ratio degradation, image definition are subjected to major injury, picture contrast produces bigger distortion, and phase distortion causes that color distortion and poor stability, reliability are low,, the inconvenience complicated to disturbing, adjusting of holding is integrated or the like, the transmitter cost costliness of simulated television also influences popularizing of TV in addition.Can use TV signal MMDS (Multichannel Microwave Distribution System after adopting digital technology, English full name is Mulitchannel Micromive DistributionSystem) microwave transport equipment, overcome the various defectives of analog television transmission, the technical performance that acquisition is higher than simulated television transmitter, but also have the not available new function of analogue technique.In order to promote China's television digitization and informationization, need development Digital Television MMDS equipment, i.e. Digital Television multichannel microwave transmission equipment.
(3) utility model content
The purpose of this utility model is a kind of Digital Television multichannel microwave transmission equipment of design, and it has television signal coding compression, multi-way signal multiplexing, modulates, separates the transmission-receiving function of mediation microwave.
Digital Television multichannel microwave transmission equipment of the present utility model comprises make a start part and receiving end part, the part of making a start comprises that input port, modulator, transmitter and transmitting antenna, transmitter comprise level controller, upconverter, go up filter and power amplifier; Receiving end partly comprises reception antenna, low noise amplifier, low-converter and following filter, the part of making a start of this equipment has 1～12 group of satellite-signal receiving terminal and/or TV signal receiving terminal, every group of satellite-signal receiving terminal includes 1～12 satellite receiver, every satellite receiver connects a code stream card, a bit stream multiplexer is gone in each code stream clamping, and bit stream multiplexer connects digital modulator and inserts transmitter again; Every group of TV signal receiving terminal comprises 1～12 tv signal input mouth, and each tv signal input mouth connects an encoder, and encoder on the same group inserts same bit stream multiplexer, and bit stream multiplexer connects digital modulator and inserts transmitter again; The transmitter of each group is with inserting mixer, and mixer is connected to transmitting antenna.Each transmitter comprises level controller, upconverter, last filter and power amplifier, and digital modulator inserts level controller, connects power amplifier through upconverter, last filter again, and power amplifier inserts mixer.The level feed-back signal of power amplifier takes back level controller.Each parts of power supply and transmitter are connected.The reception antenna of receiving end part connects low noise amplifier, low-converter and following filter, and following filter connects decoder, and decoder connects the TV signal output end mouth.According to user's needs, every complete equipment part configuration n * 10～n * 1000 receiving end part of making a start, n is 10 with interior positive integer.
The satellite TV signal that each satellite signal receiver of each group of the part of making a start receives is respectively behind the code stream card, the multichannel signal bit stream enters multiplexer, selects 2～12 cover TV programme signal bit streams formation multiplexing signal bit streams by multiplexer and sends into digital modulator.Each road TV signal of each group is carried out compressed encoding by each digital encoder, forms the multiplexing signal bit stream and enters bit stream multiplexer.Each bit stream multiplexer is multiplexed with one road transmission code stream signal with the multiplexing signal bit stream, its data transfer rate is not more than the maximum payload data rate of digital modulator, be modulated to the intermediate-freuqncy signal that is fit to the channel transmission through digital modulator, intermediate-freuqncy signal is regulated level through the level controller of each transmitter, become microwave signal through upconverter again, be amplified to specified power by high linear power amplifier behind the last filter filtering, launch by omnidirectional transmitter antenna at last.
The reception antenna of receiving end part receives that microwave signal is amplified to certain level through low noise amplifier, changes to intermediate-freuqncy signal through low-converter then, solves TV signal by decoder at last and is exported by output port.
Described tv signal input mouth of making a start part is anolog TV signals input port or digital television signal input port, respectively connects corresponding simulating television signal encoder or digital signal encoding device.Can import digital television signals such as DVD video disc, also can import the anolog TV signals that video tape recorder etc. is recorded.
Described encoder and code stream jig of making a start part has the forward error correction coding module, reduces the error rate, can realize error free transmission.
Described make a start part also the encryption equipment of configuration be connected with each digital modulator with scrambler, its encrypt and scrambled signals will disturb with enciphered message insertion transmission code stream in, could receive and to television signal decoder with the assurance validated user.
In each transmitter constant-temperature crystal oscillator is installed,, guarantees that the local frequency of upconverter is constant, thereby guarantee the stable and accurate of tranmitting frequency through oscillator access upconverter.
Mixer is connected through low-loss elliptic waveguide with transmitting antenna, guarantees high-power emission.
The part of making a start of this equipment also has the function indicating device, comprise switch control module, data sampling module and display screen, the power amplifier of transmitter can be installed one or more in power amplifier Temperature Detector, power level detector and the reflected power detector, oscillator also can be equipped with the local oscillator out-of-lock detector, power supply can be equipped with voltage detector, and each detector output end inserts data sampling module.Switch control module is connected to selection key.
The sampled data of each detector is sent into data sampling module wherethrough reason, shows the indication of power amplifier temperature or power level indication or reflection power indication or the indication of local oscillator losing lock with the selection key option that switch control module connect on display screen.
Also can in output frequency detectors, code check detector, locking indication detector, the output power detector one or more be installed, in code stream input detector, code stream output detector, the selection program detector one or more also can be installed on multiplexer at one or more encoders.The output of each detector inserts data sampling module.
The advantage of Digital Television multichannel microwave transmission equipment of the present utility model is: the input that 1, has multiple-link satellite signal and analog or digital TV signal, digital data transmission, strong interference immunity, carrier-to-noise ratio C/N threshold value is low, picture quality good, no cumulative effect, long transmission distance, straight line transmission＞50km, the relay transmission jumping figure can reach the hundreds of kilometer, can significantly reduce transmitter quantity; 2, adopt up-to-date digital signal source encoding and chnnel coding and digital modulation technique, made the frequency spectrum compression of signal, improved the channel utilance greatly, improved the comprehensive utilization of power and frequency spectrum; 3, with forward error correction coding (FEC) technology, reduced the error rate (BER) during digital television signal is handled, it is little influenced by spatial interference etc., can realize that therefore zero defect receives, and reliability is far above analog signal transmission; 4, its transmitter works in average power, so the power utilization height of power amplifier transmitting tube; 5, digital filtering is eliminated noise, improves the signal to noise ratio of image, realizes adaptive two dimension, three-dimensional luminance separation, thoroughly eliminates brightness and disturbs, and picture quality greatly improves; 6, configurable scrambling/descrambler is realized the addressing Fare Collection System; 7, under same transmission range, the receiving end signal received field strength can reduce, and can reduce the transmitting power of digital transmitter, thereby has reduced equipment cost; 8, equipment cost is low, image transmission quality height, and system operation is easy, is easy to safeguard, is convenient to popularizing of town and country television network.
(4) description of drawings
Fig. 1 is this digital TV multichannel microwave transmission equipment embodiment partial circuit block diagram of making a start.
Fig. 2 is this digital TV multichannel microwave transmission equipment embodiment receiving end partial circuit block diagram.
Fig. 3 is this digital TV multichannel microwave transmission equipment embodiment function indicating section circuit block diagram.
(5) embodiment
This digital TV multichannel microwave transmission equipment embodiment comprises the part of making a start, receiving end part and function indicating section.
This example make a start partial circuit as shown in Figure 1, have each 2 groups of satellite-signal receiving terminal and/or TV signal receiving terminals, every group of satellite-signal receiving terminal includes 4 satellite receiver, used satellite receiver is for meeting the receiver of satellite digital video broadcast standard (DVB-S), every satellite receiver connects a code stream card, a bit stream multiplexer is gone in each code stream clamping, and bit stream multiplexer connects digital modulator and inserts transmitter again; Every group of TV signal receiving terminal comprises 6 tv signal input mouths, be anolog TV signals input port or digital television signal input port, each tv signal input mouth connects an encoder, encoder on the same group inserts same bit stream multiplexer, bit stream multiplexer connects digital modulator, encryption equipment also is connected with each digital modulator with scrambler, and each digital modulator inserts transmitter respectively; The transmitter of each group is with inserting mixer, and mixer is penetrated antenna through the elliptic waveguide sending and receiving.Each transmitter comprises level controller, upconverter, last filter and power amplifier, and digital modulator inserts level controller, connects power amplifier through upconverter, last filter again, and power amplifier inserts mixer.The level signal feedback of power amplifier takes back level controller.Constant-temperature crystal oscillator inserts upconverter through oscillator, and each parts of power supply and transmitter are connected.Satellite receiver, code stream card, bit stream multiplexer, digital modulator, encoder, encryption equipment and scrambler and transmitter are installed in the standard cabinet, and mixer is installed on enclosure top, and antenna is placed on the iron tower.
The circuit of this routine receiving end part as shown in Figure 2, reception antenna connects low noise amplifier, low-converter and following filter, following filter connects decoder, decoder connects the TV signal output end mouth.Charger is connected with associated components.The low noise amplifier of receiving end part, low-converter, following filter and decoder all are installed in the box body of water-tight, protection against the tide.
This example make a start the part the function indicating device circuit as shown in Figure 3, comprise switch control module, data sampling module and display screen, its display screen is a liquid crystal display screen.The power amplifier of each transmitter is equipped with one or more in power amplifier Temperature Detector, power level detector and the reflected power detector, oscillator also can be installed the local oscillator out-of-lock detector, power supply can be equipped with voltage detector, and each detector output end inserts data sampling module.Switch control module is connected to selection key.Each parts of each transmitter and function indicating device thereof are installed in the same machine box, and liquid crystal display screen and selection key are positioned at the machine box panel, and each transmitter machine box is installed in the rack of the part of making a start, and its panel is on the rack front panel.
The foregoing description is the specific case that the purpose of this utility model, technical scheme and beneficial effect are further described only, and the utility model is not to be defined in this.All any modifications of within scope of disclosure of the present utility model, being made, be equal to replacement, improvement etc., all be included within the protection range of the present utility model.
Claims (10)
1, a kind of Digital Television multichannel microwave transmission equipment comprises make a start part and receiving end part, and the part of making a start comprises input port, modulator, transmitter and transmitting antenna, and transmitter comprises filter, upconverter and power amplifier; Receiving end partly comprises reception antenna, low noise amplifier, low-converter and following filter, it is characterized in that:
The described part of making a start has 1～12 group of satellite-signal receiving terminal and/or TV signal receiving terminal, every group of satellite-signal receiving terminal includes 1～12 satellite receiver, every satellite receiver connects a code stream card, a bit stream multiplexer is gone in each code stream clamping, and bit stream multiplexer connects digital modulator and inserts transmitter again; Every group of TV signal receiving terminal comprises 1～12 tv signal input mouth, and each tv signal input mouth connects an encoder, and encoder on the same group inserts same bit stream multiplexer, and bit stream multiplexer connects digital modulator and inserts transmitter again; The transmitter of each group is with inserting mixer, and mixer is connected to transmitting antenna; Each transmitter comprises level controller, upconverter, goes up filter and power amplifier, digital modulator inserts level controller, connect power amplifier through upconverter, last filter again, power amplifier inserts mixer, the level signal feedback of power amplifier takes back level controller, and each parts of power supply and transmitter are connected;
The reception antenna of described receiving end part connects low noise amplifier, low-converter and following filter, and following filter connects decoder, and decoder connects the TV signal output end mouth;
Every complete equipment part configuration n～n * 1000 receiving end part of making a start, n is 10 with interior positive integer.
2, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
Described tv signal input mouth of making a start part is anolog TV signals input port or digital television signal input port.
3, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
Described encoder and code stream jig of making a start part has the forward error correction coding module.
4, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
The encryption equipment that the described part of making a start also disposes is connected with each digital modulator with scrambler.
5, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
In the described transmitter constant-temperature crystal oscillator is installed, inserts upconverter through oscillator.
6, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
Described mixer is connected through low-loss elliptic waveguide with transmitting antenna.
7, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
The described part of making a start also has the function indicating device, comprise switch control module, data sampling module and display screen, the power amplifier of transmitter is equipped with one or more in power amplifier Temperature Detector, power level detector and the reflected power detector, and/or oscillator is equipped with the local oscillator out-of-lock detector, and/or power supply is equipped with voltage detector, each detector output end inserts data sampling module, and switch control module is connected to selection key.
8, Digital Television multichannel microwave transmission equipment according to claim 7 is characterized in that:
One or more in the described encoder are equipped with one or more in output frequency detector, code check detector, locking indication detector and the output power detector, or code stream input detector, code stream output detector are installed on multiplexer, are selected in the program detector one or more, the output of each detector inserts data sampling module.
9, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
Described satellite receiver, code stream card, bit stream multiplexer, digital modulator, encoder, encryption equipment and scrambler and transmitter of making a start part is installed in the standard cabinet, and mixer is installed on enclosure top.
10, Digital Television multichannel microwave transmission equipment according to claim 1 is characterized in that:
The low noise amplifier of described receiving end part, low-converter, following filter and decoder all are installed in the box body of water-tight, protection against the tide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920140815 CN201409208Y (en) | 2009-05-06 | 2009-05-06 | Multi-way microwave transmission device of digital television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920140815 CN201409208Y (en) | 2009-05-06 | 2009-05-06 | Multi-way microwave transmission device of digital television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201409208Y true CN201409208Y (en) | 2010-02-17 |
Family
ID=41680154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920140815 Expired - Fee Related CN201409208Y (en) | 2009-05-06 | 2009-05-06 | Multi-way microwave transmission device of digital television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201409208Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514548A (en) * | 2016-02-01 | 2016-04-20 | 谢广鹏 | Electric power monitoring system |
| CN105514553A (en) * | 2016-02-01 | 2016-04-20 | 谢广鹏 | Electric power detection system |
| CN106535004A (en) * | 2015-09-15 | 2017-03-22 | 国家新闻出版广电总局广播科学研究院 | Ground digital television single-frequency network networking method and system |
-
2009
- 2009-05-06 CN CN 200920140815 patent/CN201409208Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535004A (en) * | 2015-09-15 | 2017-03-22 | 国家新闻出版广电总局广播科学研究院 | Ground digital television single-frequency network networking method and system |
| CN105514548A (en) * | 2016-02-01 | 2016-04-20 | 谢广鹏 | Electric power monitoring system |
| CN105514553A (en) * | 2016-02-01 | 2016-04-20 | 谢广鹏 | Electric power detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100217 Termination date: 20130506 |