CN204598198U - A kind of multi channel signals modulator - Google Patents
A kind of multi channel signals modulator Download PDFInfo
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- CN204598198U CN204598198U CN201520223933.7U CN201520223933U CN204598198U CN 204598198 U CN204598198 U CN 204598198U CN 201520223933 U CN201520223933 U CN 201520223933U CN 204598198 U CN204598198 U CN 204598198U
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Abstract
The utility model is about a kind of multi channel signals modulator, comprising: channel coding modulation unit, digital intermediate frequency synthesis unit, rf broadband modulating unit and signal amplify and regulon, wherein, the input of channel coding modulation unit is connected with the output of the encoder of multi-path digital TV programme and receives multichannel code stream, the output of channel coding modulation unit is connected output multi-channel baseband I/Q signal with the input of digital intermediate frequency synthesis unit, the output of digital intermediate frequency synthesis unit is connected with the input of rf broadband modulating unit and exports the baseband I/Q signal after synthesizing, output and the signal of rf broadband modulating unit amplify the radiofrequency signal being connected output multi-channel with the input of regulon and synthesizing, signal amplification is connected with the input of transmitter the radiofrequency signal exporting the output power value met set by equipment with the output of regulon.The utility model can realize the modulation of multi channel signals, simplifies the realization of system, reduces the design cost of front end.
Description
Technical field
The utility model relates to modulation technique field, particularly relates to a kind of multi channel signals modulator simultaneously realizing multi channel signals.
Background technology
Along with the development of digital terrestrial television technology, the demand that digital terrestrial television covers being increased greatly, particularly in order to increase transmitted digital television program, usually needing the digital television program broadcast simultaneously carrying out multiple channel.Like this, in actual use, usually have to multiple Single channel modulator to be combined, broadcast after the radiofrequency signal of output is synthesized, this just needs multiple digital television modulator, therefore needs to take the more device space, also can increase equipment purchase and maintenance cost simultaneously.
As can be seen here, above-mentioned prior art with in use in structure, obviously still has inconvenience and defect, and is urgently further improved.
Summary of the invention
The purpose of this utility model is, overcome the defect that prior art exists, and a kind of multi channel signals modulator of new structure is provided, technical problem to be solved is that it adopts modularized design, and by the conversion of IF-FRE, modulate the signal to required frequency location, solve the synthesis of multi-channel digital signal at digital intermediate frequency, achieve the modulation of multi channel signals, and the Frequency point required for can changing arbitrarily in selected channel, the realization of simplification system, greatly reduce the Front-end Design cost required for the broadcast of multi-channel digital terrestrial television programming, reliability is high, applicability is strong, be very suitable for practicality.
The purpose of this utility model and solve its technical problem be adopt following technical scheme realize.According to a kind of multi channel signals modulator that the utility model proposes, it comprises: channel coding modulation unit, digital intermediate frequency synthesis unit, rf broadband modulating unit and signal amplify and regulon, wherein, the input of described channel coding modulation unit is connected with the output of the encoder of multi-path digital TV programme and receives multichannel code stream, the output of described channel coding modulation unit is connected output multi-channel baseband I/Q signal with the input of described digital intermediate frequency synthesis unit, the output of described digital intermediate frequency synthesis unit is connected with the input of described rf broadband modulating unit and exports the baseband I/Q signal after synthesizing, output and the described signal of described rf broadband modulating unit amplify the radiofrequency signal being connected output multi-channel with the input of regulon and synthesizing, described signal amplification is connected with the input of transmitter the radiofrequency signal exporting the output power value met set by equipment with the output of regulon.
The purpose of this utility model and solve its technical problem and can also be further achieved by the following technical measures.
Aforesaid multi channel signals modulator, wherein said channel coding modulation unit comprises multiple channel coding modulator, the input of multiple described channel coding modulator is connected with the output of the described encoder of multi-path digital TV programme respectively and receives multichannel code stream, and the output of multiple described channel coding modulator is connected output multi-channel baseband I/Q signal respectively respectively with the input of described digital intermediate frequency synthesis unit.
Aforesaid multi channel signals modulator, wherein multiple described channel coding modulator is meet the chnnel coding of GB20600-2006 digital terrestrial television standard and the channel coding modulator of modulation.
Aforesaid multi channel signals modulator, wherein said digital intermediate frequency synthesis unit comprises: frequency spectrum shift circuit, summer and Direct Digital Synthesizer; The input of described frequency spectrum shift circuit is connected with the output of multiple described channel coding modulator respectively and receives multichannel baseband I/Q signal, the input of described frequency spectrum shift circuit is also connected the signal receiving described Direct Digital Synthesizer and export with the output of described Direct Digital Synthesizer, the output of described frequency spectrum shift circuit is connected the baseband I/Q signal after output multi-channel frequency spectrum shift with the input of described summer, and the output of described summer is connected with the input of described rf broadband modulating unit and exports the baseband I/Q signal after synthesizing.
Aforesaid multi channel signals modulator, wherein said rf broadband modulating unit comprises: digital analog converter, analog modulator and phase-locked loop frequency synthesizer; The input of described digital analog converter is connected with the output of described summer and receives the baseband I/Q signal after synthesizing, the output of described digital analog converter is connected with the input of described analog modulator and exports analog baseband signal, the input of described analog modulator is also connected the signal receiving described phase-locked loop frequency synthesizer and export with the output of described phase-locked loop frequency synthesizer, output and the described signal of described analog modulator amplify the radiofrequency signal being connected output multi-channel with the input of regulon and synthesizing.
Aforesaid multi channel signals modulator, wherein said signal amplifies and regulon comprises: power amplifier and power attenuator; The input of the output of described analog modulator and described power amplifier or described power attenuator is connected the radiofrequency signal that output multi-channel synthesizes, and the output of described power amplifier or described power attenuator is connected with the input of described transmitter the radiofrequency signal exporting the output power value met set by equipment.
Aforesaid multi channel signals modulator, also comprise microcontroller and display unit, described microcontroller and display unit amplify with described channel coding modulation unit, described digital intermediate frequency synthesis unit, described rf broadband modulating unit and described signal to be respectively connected with regulon and export control signal and receive pilot signal.
Aforesaid multi channel signals modulator, wherein said microcontroller and display unit comprise microcontroller and display, and described microcontroller amplifies with described channel coding modulation unit, described digital intermediate frequency synthesis unit, described rf broadband modulating unit, described signal respectively and is connected with regulon and described display.
The utility model compared with prior art has obvious advantage and beneficial effect.By technique scheme, a kind of multi channel signals modulator of the utility model at least has following advantages and beneficial effect: multi channel signals modulator of the present utility model solves the synthesis of multi-channel digital signal at digital intermediate frequency, achieve the modulation of multi channel signals, and the Frequency point required for can changing arbitrarily in selected channel, the realization of simplification system, greatly reduce the Front-end Design cost required for the broadcast of multi-channel digital terrestrial television programming, reliability is high, applicability is strong.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to technological means of the present utility model can be better understood, and can be implemented according to the content of specification, and can become apparent to allow above and other object of the present utility model, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the block diagram of a kind of multi channel signals modulator of the utility model.
Fig. 2 is the block diagram of a kind of multi channel signals modulator one of the utility model preferred embodiment.
Fig. 3 is the schematic diagram of a preferred embodiment of a kind of multi channel signals modulator of the utility model multichannel frequency spectrum frequency displacement.
Embodiment
For further setting forth the utility model for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to according to a kind of its embodiment of multi channel signals modulator, structure, feature and the effect thereof that the utility model proposes, be described in detail as follows.
Referring to shown in Fig. 1, is the block diagram of a kind of multi channel signals modulator of the utility model.A kind of multi channel signals modulator of the present utility model adopts modularized design, amplifies form with regulon 140 primarily of channel coding modulation unit 110, digital intermediate frequency synthesis unit 120, rf broadband modulating unit 130 and signal.Wherein, the input of channel coding modulation unit 110 is connected with the output of the encoder of multi-path digital TV programme and receives multichannel code stream.Channel coding modulation unit 110 mainly realizes chnnel coding and the modulation of GB20600-2006 digital terrestrial television standard, and finally export baseband I/Q signal device, its channel parameter can be configured according to demand.The output of channel coding modulation unit 110 is connected output multi-channel baseband I/Q signal with the input of digital intermediate frequency synthesis unit 120.Digital intermediate frequency synthesis unit 120 mainly realizes the signal of multi-path digital TV programme to be modulated on required channel point (as shown in Figure 3) respectively according to selected channel, finally the baseband I after multichannel frequency spectrum shift/Q signal summation is exported.The output of digital intermediate frequency synthesis unit 120 is connected with the input of rf broadband modulating unit 130 and exports the baseband I/Q signal after synthesizing.Rf broadband modulating unit 130 mainly realizes the baseband I/Q signal after by synthesis and is modulated to radio frequency output by Direct conversion.Output and the signal of rf broadband modulating unit 130 amplify the radiofrequency signal being connected output multi-channel with the input of regulon 140 and synthesizing.Export after the radiofrequency signal that signal amplifies and regulon 140 mainly realizes multichannel to synthesize carries out amplifying or decay to the output power value set by equipment.Signal amplification is connected with the input of transmitter the radiofrequency signal exporting the output power value met set by equipment with the output of regulon 140.
Referring to shown in Fig. 2, is the block diagram of a kind of multi channel signals modulator one of the utility model preferred embodiment.
Channel coding modulation unit 110 of the present utility model comprises multiple channel coding modulator.Be five channel coding modulators 111,112,113,114,115 in the present embodiment, but the number of the utility model channel coding modulator is not as limit.As shown in Figure 2, the input of five channel coding modulators 111,112,113,114,115 is connected reception five road code stream with the output of the encoder of five railway digital TV programme respectively, and the output of five channel coding modulators 111,112,113,114,115 is connected with the input of digital intermediate frequency synthesis unit 120 respectively and exports five roadbed band i/q signals respectively.Wherein, channel coding modulator 111,112,113,114, the 115 of the present utility model channel coding modulator that is the chnnel coding and modulation that meet GB20600-2006 digital terrestrial television standard.
Digital intermediate frequency synthesis unit 120 of the present utility model comprises: frequency spectrum shift circuit 121, summer 122 and Direct Digital Synthesizer (DDS) 123.Wherein, the input of frequency spectrum shift circuit 121 respectively with five channel coding modulators 111, 112, 113, 114, the output of 115 connects reception five roadbed band i/q signal, the input of frequency spectrum shift circuit 121 is also connected the signal receiving Direct Digital Synthesizer 123 and export with the output of Direct Digital Synthesizer 123, the output of frequency spectrum shift circuit 121 is connected the baseband I/Q signal after the frequency spectrum shift of output five road with the input of summer 122, the output of summer 122 is connected with the input of rf broadband modulating unit 130 and exports the baseband I/Q signal after synthesizing.
Rf broadband modulating unit 130 of the present utility model comprises: digital analog converter (DAC) 131, analog modulator 132 and phase-locked loop frequency synthesizer 133.Wherein, the input of digital analog converter 131 is connected with the output of summer 122 and receives the baseband I/Q signal after synthesizing, the output of digital analog converter 131 is connected with the input of analog modulator 132 and exports analog baseband signal, the input of analog modulator 132 is also connected the signal receiving phase-locked loop frequency synthesizer 133 and export with the output of phase-locked loop frequency synthesizer 133, output and the signal of analog modulator 133 amplify the radiofrequency signal being connected output multi-channel with the input of regulon 140 and synthesizing.
Signal of the present utility model amplifies and regulon 140 comprises: power amplifier 141 and power attenuator 142.Wherein, the input of the output of analog modulator 132 and power amplifier 141 or power attenuator 142 is connected the radiofrequency signal that output multi-channel synthesizes, and the output of power amplifier 141 or power attenuator 142 is connected with the input of transmitter the radiofrequency signal exporting the output power value met set by equipment.
Multi channel signals modulator of the present utility model is also provided with microcontroller and display unit 150, and microcontroller and display unit 150 amplify with channel coding modulation unit 110, digital intermediate frequency synthesis unit 120, rf broadband modulating unit 130 and signal to be respectively connected with regulon 140 and export control signal and receive pilot signal.Wherein, microcontroller and display unit 150 comprise microcontroller and display, and microcontroller amplifies with channel coding modulation unit 110, digital intermediate frequency synthesis unit 120, rf broadband modulating unit 130, signal respectively and is connected with regulon 140 and display.
The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model, any those skilled in the art are not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solutions of the utility model, according to any simple modification that technical spirit of the present utility model is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (8)
1. a multi channel signals modulator, is characterized in that it comprises: channel coding modulation unit, digital intermediate frequency synthesis unit, rf broadband modulating unit and signal amplify and regulon, wherein, the input of described channel coding modulation unit is connected with the output of the encoder of multi-path digital TV programme and receives multichannel code stream, the output of described channel coding modulation unit is connected output multi-channel baseband I/Q signal with the input of described digital intermediate frequency synthesis unit, the output of described digital intermediate frequency synthesis unit is connected with the input of described rf broadband modulating unit and exports the baseband I/Q signal after synthesizing, output and the described signal of described rf broadband modulating unit amplify the radiofrequency signal being connected output multi-channel with the input of regulon and synthesizing, described signal amplification is connected with the input of transmitter the radiofrequency signal exporting the output power value met set by equipment with the output of regulon.
2. multi channel signals modulator according to claim 1, it is characterized in that wherein said channel coding modulation unit comprises multiple channel coding modulator, the input of multiple described channel coding modulator is connected with the output of the described encoder of multi-path digital TV programme respectively and receives multichannel code stream, and the output of multiple described channel coding modulator is connected output multi-channel baseband I/Q signal respectively respectively with the input of described digital intermediate frequency synthesis unit.
3. multi channel signals modulator according to claim 2, is characterized in that wherein multiple described channel coding modulator is meet the chnnel coding of GB20600-2006 digital terrestrial television standard and the channel coding modulator of modulation.
4. multi channel signals modulator according to claim 3, is characterized in that wherein said digital intermediate frequency synthesis unit comprises: frequency spectrum shift circuit, summer and Direct Digital Synthesizer; The input of described frequency spectrum shift circuit is connected with the output of multiple described channel coding modulator respectively and receives multichannel baseband I/Q signal, the input of described frequency spectrum shift circuit is also connected the signal receiving described Direct Digital Synthesizer and export with the output of described Direct Digital Synthesizer, the output of described frequency spectrum shift circuit is connected the baseband I/Q signal after output multi-channel frequency spectrum shift with the input of described summer, and the output of described summer is connected with the input of described rf broadband modulating unit and exports the baseband I/Q signal after synthesizing.
5. multi channel signals modulator according to claim 4, is characterized in that wherein said rf broadband modulating unit comprises: digital analog converter, analog modulator and phase-locked loop frequency synthesizer; The input of described digital analog converter is connected with the output of described summer and receives the baseband I/Q signal after synthesizing, the output of described digital analog converter is connected with the input of described analog modulator and exports analog baseband signal, the input of described analog modulator is also connected the signal receiving described phase-locked loop frequency synthesizer and export with the output of described phase-locked loop frequency synthesizer, output and the described signal of described analog modulator amplify the radiofrequency signal being connected output multi-channel with the input of regulon and synthesizing.
6. multi channel signals modulator according to claim 5, is characterized in that wherein said signal amplifies and comprises with regulon: power amplifier and power attenuator; The input of the output of described analog modulator and described power amplifier or described power attenuator is connected the radiofrequency signal that output multi-channel synthesizes, and the output of described power amplifier or described power attenuator is connected with the input of described transmitter the radiofrequency signal exporting the output power value met set by equipment.
7. the multi channel signals modulator according to claim arbitrary in claim 1 to 6, it is characterized in that it also comprises microcontroller and display unit, described microcontroller and display unit amplify with described channel coding modulation unit, described digital intermediate frequency synthesis unit, described rf broadband modulating unit and described signal to be respectively connected with regulon and export control signal and receive pilot signal.
8. multi channel signals modulator according to claim 7, it is characterized in that wherein said microcontroller and display unit comprise microcontroller and display, described microcontroller amplifies with described channel coding modulation unit, described digital intermediate frequency synthesis unit, described rf broadband modulating unit, described signal respectively and is connected with regulon and described display.
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| CN201520223933.7U CN204598198U (en) | 2015-04-14 | 2015-04-14 | A kind of multi channel signals modulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306846A (en) * | 2015-11-24 | 2016-02-03 | 北京北广科技股份有限公司 | Digital television exciter capable of outputting multiple channels simultaneously |
| CN106411810A (en) * | 2016-11-04 | 2017-02-15 | 中国电子科技集团公司第五十四研究所 | Intermediate-frequency modulator, intermediate-frequency demodulator and multi-waveform fusion device |
| CN107231204A (en) * | 2017-05-19 | 2017-10-03 | 吉林省广播电视研究所(吉林省新闻出版***科技信息中心) | Frequency modulation broadcasting multi-path digital modulating system |
| CN116318235A (en) * | 2023-03-08 | 2023-06-23 | 深钛智能科技(苏州)有限公司 | Multichannel radio frequency receiving and transmitting system |
-
2015
- 2015-04-14 CN CN201520223933.7U patent/CN204598198U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306846A (en) * | 2015-11-24 | 2016-02-03 | 北京北广科技股份有限公司 | Digital television exciter capable of outputting multiple channels simultaneously |
| CN106411810A (en) * | 2016-11-04 | 2017-02-15 | 中国电子科技集团公司第五十四研究所 | Intermediate-frequency modulator, intermediate-frequency demodulator and multi-waveform fusion device |
| CN106411810B (en) * | 2016-11-04 | 2019-05-17 | 中国电子科技集团公司第五十四研究所 | IF modulator, if demodulator and more waveform confluence devices |
| CN107231204A (en) * | 2017-05-19 | 2017-10-03 | 吉林省广播电视研究所(吉林省新闻出版***科技信息中心) | Frequency modulation broadcasting multi-path digital modulating system |
| CN107231204B (en) * | 2017-05-19 | 2019-10-29 | 吉林省广播电视研究所(吉林省新闻出版***科技信息中心) | Frequency modulation broadcasting multi-path digital modulating system |
| CN116318235A (en) * | 2023-03-08 | 2023-06-23 | 深钛智能科技(苏州)有限公司 | Multichannel radio frequency receiving and transmitting system |
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