CN203027265U - Digital processing type frequency modulation synchronized broadcasting exciter - Google Patents
Digital processing type frequency modulation synchronized broadcasting exciter Download PDFInfo
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- CN203027265U CN203027265U CN 201320026652 CN201320026652U CN203027265U CN 203027265 U CN203027265 U CN 203027265U CN 201320026652 CN201320026652 CN 201320026652 CN 201320026652 U CN201320026652 U CN 201320026652U CN 203027265 U CN203027265 U CN 203027265U
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Abstract
The utility model relates to a digital processing type frequency modulation synchronized broadcasting exciter comprising a digital audio signal interface, wherein the digital audio signal interface is connected with a signal processing unit composed of an FPGA (Field Programmable Gate Array) chip and used for encoding a digital audio signal sent by the digital audio signal interface to generate a composite digital signal; the signal processing unit is connected with a microprocessor and a signal synchronizing unit used for adjusting signal delay; the signal processing unit is further connected with a direct digital frequency synthesizer used for receiving the composite digital signal sent by the signal processing unit and processing the composite digital signal sent by the signal processing unit to generate a frequency modulation broadcasting radio frequency signal under the control of the microprocessor; and the output end of the direct digital frequency synthesizer is sequentially connected with a primary power amplifier, a final power amplifier, a low pass filter and a sampling circuit. The digital processing type frequency modulation synchronized broadcasting exciter provided by the utility model has a frequency modulation synchronized broadcasting function and excellent technical performance indexes.
Description
Technical field
The utility model relates to synchronized broadcasting exciter field, particularly a kind of digital processing mode synchronous frequency-modulating broadcast exciter.
Background technology
Development along with China's stereophonic FM broadcasting cause, the FM broadcasting fidelity is high, sound is dulect, has high antijamming capability, can hold a large amount of transmitting stations in broadcast band, broadcast multiple programs, the appearance of highway synchronous frequency-modulating broadcast network, cause the FM broadcasting development wide, promise well.Along with the raising with living standards of the people of developing rapidly of science and technology, the fidelity of people's frequency-modulation broadcasting, signal to noise ratio, dynamic range, the playback frequency response, well arranged, the technical requirements such as telepresenc are more and more higher.
Particularly synchronized broadcasting requires a plurality of stations to adopt same frequency, same time to send same set of program.Because each station transmission link is different, even all adopt the same link also to have the variation issue such as delay variation, transmission route parameter, be difficult to guarantee constant propagation delay time.
The utility model content
The technical problems to be solved in the utility model is to overcome the above-mentioned deficiency of prior art, and a kind of digital processing mode synchronous frequency-modulating broadcast exciter that guarantees constant propagation delay time is provided.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
A kind of synchronous frequency-modulating broadcast exciter of digital processing mode, comprise digital audio interface signal, described digital audio interface signal connects the signal processing unit that the digital audio signal coding that is used for that described digital audio interface signal is sent here that is made of fpga chip generates complex digital signal; Described signal processing unit is connected with microprocessor and is used for adjusting the signal synchronization unit of signal delay; Described signal processing unit also is connected with the complex digital signal of sending here be used to receiving described signal processing unit, and the complex digital signal of under described microprocessor is controlled, described signal processing unit being sent here is processed the Direct Digital Frequency Synthesizers that generates the FM broadcasting radiofrequency signal; Described Direct Digital Frequency Synthesizers output connects prime power amplifier, final stage power amplifier and low pass filter and sample circuit successively.
Described microprocessor is 32 ARM chips.
Described microprocessor is connected with input unit and display unit.
Described display unit is LCDs, and described input unit is keyboard.
Described signal synchronization unit is inner temperature compensating crystal oscillator or the external GPS interface that is used for the time reference of reception GPS, and described inner temperature compensating crystal oscillator or external GPS interface are connected with described signal processing unit by the clock switch unit.
The synchronous frequency-modulating broadcast exciter of above-mentioned digital processing mode also comprises left and right sound channels analog input interface and SCA input interface; Described left and right sound channels analog input interface is connected with the SCA input interface and is connected described signal processing unit.
Compared with prior art, the beneficial effects of the utility model.
The synchronous frequency-modulating broadcast exciter of digital processing mode of the present utility model, by field programmable gate array (FPGA) and Direct Digital Frequency Synthesizers (DDS), realize digital coding and digital frequency modulation, and frequency can promptly become, modulated FM signal is delivered to prime power amplifier pre-amplification, promote again final stage power amplifier and amplify, through low pass filter and sample circuit output frequency modulation power 30W.Digital processing mode owing to adopting field programmable gate array (FPGA) and Direct Digital Frequency Synthesizers (DDS) makes it have the synchronous frequency-modulating broadcast function, and technical performance index, function are much better than the FM broadcasting exciter that analog form is processed.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Execution mode of the present utility model is not limited to following examples, within the various variations of making under the prerequisite that does not break away from the utility model aim all belong to protection range of the present utility model.
As shown in Figure 1, the synchronous frequency-modulating broadcast exciter of digital processing mode of the present utility model, comprise digital audio interface signal, described digital audio interface signal connects the signal processing unit that the digital audio signal coding that is used for that described digital audio interface signal is sent here that is made of fpga chip generates complex digital signal; Described signal processing unit is connected with microprocessor and is used for adjusting the signal synchronization unit of signal delay; Described signal processing unit also is connected with the complex digital signal of sending here be used to receiving described signal processing unit, and the complex digital signal of under described microprocessor is controlled, described signal processing unit being sent here is processed the Direct Digital Frequency Synthesizers that generates the FM broadcasting radiofrequency signal; Described Direct Digital Frequency Synthesizers output connects prime power amplifier, final stage power amplifier and low pass filter and sample circuit successively.The synchronous frequency-modulating broadcast exciter of digital processing mode of the present utility model is realized digital coding and digital frequency modulation by field programmable gate array (FPGA) and Direct Digital Frequency Synthesizers (DDS), and frequency can promptly become, modulated FM signal is delivered to prime power amplifier pre-amplification, promote again final stage power amplifier and amplify, through low pass filter and sample circuit output frequency modulation power 30W.Digital processing mode owing to adopting field programmable gate array (FPGA) and Direct Digital Frequency Synthesizers (DDS) makes it have the synchronous frequency-modulating broadcast function, and technical performance index, function are much better than the FM broadcasting exciter that analog form is processed.
Wherein, described microprocessor is 32 ARM chips.Described microprocessor is connected with input unit and display unit.Further, described display unit is LCDs, and described input unit is keyboard.Described signal synchronization unit is inner temperature compensating crystal oscillator or the external GPS interface that is used for the time reference of reception GPS, and described inner temperature compensating crystal oscillator or external GPS interface are connected with described signal processing unit by the clock switch unit.frequency stability is to realize the key technology of a plurality of synchronous frequency-modulating broadcast transmitting station same frequency emissions, the utility model has adopted inter-sync and outer same dual mode, the inside 10MHz temperature compensating crystal oscillator of inter-sync proportion stability＜1E-6, the outer synchronous GPS locking of adopting, with " pulse per second (PPS) " time reference in GPS, be inserted in transport stream by this external GPS interface, realize time-delay " dynamic auto adjustment ", thereby possesses the synchronous frequency-modulating broadcast network function, frequency stability＜1E-11 during work, to meet the synchronous specification requirement of synchronous frequency-modulating broadcast network tranmitting frequency.
The synchronous frequency-modulating broadcast exciter of above-mentioned digital processing mode also comprises left and right sound channels analog input interface and SCA input interface; Described left and right sound channels analog input interface is connected with the SCA input interface and is connected described signal processing unit.Left and right sound channels analog input interface and SCA input interface, digital audio interface signal have great raising for synchronized broadcasting function networking performance, its stability is better than adopting the analogue audio frequency mode, and the transmission of signal source can directly be transmitted by network, tonequality is almost had no effect, very convenient; SCA is by additional channel the transmission of data or additional control signal, provides multiple choices for addressable or corresponding function use, can be also the RDS input.Need to prove, above-mentioned each circuit function unit or circuit function module or chip are existing mature technology, specifically no longer describe in detail.
The utility model adopts field programmable gate array (FPGA) and Direct Digital Frequency Synthesizers (DDS).Simulated audio signal is through the speed sampling of high speed A/D conversion device (A/D) (not shown) with 24 192K, analog signal is quantized into delivers to the FPGA generation complex digital signal of encoding after digital signal, realize frequency modulation(FM) by the hybrid circuit of microprocessor ARM control frequency value and DDS core again, the digital signal of output by after the high speed D/A converter (D/A) of 16 1G speed, is reduced into digital signal the modulated radio frequency analog signal of 87.5～108MHz frequency at last.Direct Digital Frequency Synthesizers DDS compares with traditional frequency synthesizer, has the advantages such as low cost, low-power consumption, high-resolution and quick change-over time, has guaranteed to realize that at the synchronous frequency-modulating broadcast exciter frequency is switched and the frequency precise accuracy fast.
The utility model output delay data are adjustable, maximum 20ms.The time-delay that just need to regulate when this time-delay refers to adopt the synchronized broadcasting networking mode to use, it is the time-delay that produces through different path transmissions for adapting to different local signal sources, make signal can arrive simultaneously different receiving terminals after adjusting time-delay, to guarantee the synchronous requirement of signal source of synchronous frequency-modulating broadcast.The frequency deviation data are adjustable, and the amplitude of the simulation signal generator of input can arrange its amplitude by keyboard, and the control range of positive and negative 6dB can adapt to the multiple signal source amplitude.Complete machine adopts 32 ARM control technologys, and control performance is good, is swift in response.Adopt 32 arm processor control technologys, the functions such as the demonstration of responsible exciter, communication, configuration, protection provide high-performance, high efficiency, at a high speed processing and control ability, guarantee the stable operation of exciter.Complete machine adopts the parameters setting of big screen LCD display actuator, and is succinct directly perceived.The various functions parameter of large-screen lc energy display actuator and configuration etc., and revise the demonstration configuration feature by keyboard, simple and clear, easy to operate.10.30W power amplifier adopts high-power broadband technology design, guarantees in 87.5～108MHz frequency range.
The above describes in detail preferred embodiment of the present utility model by reference to the accompanying drawings; but the utility model is not limited to above-described embodiment; can also make various variations in the ken that those of ordinary skills possess, within these variations all belong to protection range of the present utility model.
Claims (6)
1. the synchronous frequency-modulating broadcast exciter of a digital processing mode, it is characterized in that: comprise digital audio interface signal, described digital audio interface signal connects the signal processing unit that the digital audio signal coding that is used for that described digital audio interface signal is sent here that is made of fpga chip generates complex digital signal; Described signal processing unit is connected with microprocessor and is used for adjusting the signal synchronization unit of signal delay; Described signal processing unit also is connected with the complex digital signal of sending here be used to receiving described signal processing unit, and the complex digital signal of under described microprocessor is controlled, described signal processing unit being sent here is processed the Direct Digital Frequency Synthesizers that generates the FM broadcasting radiofrequency signal; Described Direct Digital Frequency Synthesizers output connects prime power amplifier, final stage power amplifier and low pass filter and sample circuit successively.
2. the synchronous frequency-modulating broadcast exciter of digital processing mode according to claim 1, it is characterized in that: described microprocessor is 32 ARM chips.
3. the synchronous frequency-modulating broadcast exciter of digital processing mode according to claim 1, it is characterized in that: described microprocessor is connected with input unit and display unit.
4. the synchronous frequency-modulating broadcast exciter of digital processing mode according to claim 3, it is characterized in that: described display unit is LCDs, described input unit is keyboard.
5. the synchronous frequency-modulating broadcast exciter of digital processing mode according to claim 1 is characterized in that: described signal synchronization unit is the external GPS interface that inner temperature compensating crystal oscillator or be used for receives the time reference of GPS; Described inner temperature compensating crystal oscillator or external GPS interface are connected with described signal processing unit by the clock switch unit.
6. the synchronous frequency-modulating broadcast exciter of digital processing mode according to claim 1, is characterized in that: also comprise left and right sound channels analog input interface and SCA input interface; Described left and right sound channels analog input interface is connected with the SCA input interface and is connected described signal processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320026652 CN203027265U (en) | 2013-01-18 | 2013-01-18 | Digital processing type frequency modulation synchronized broadcasting exciter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320026652 CN203027265U (en) | 2013-01-18 | 2013-01-18 | Digital processing type frequency modulation synchronized broadcasting exciter |
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| CN 201320026652 Expired - Lifetime CN203027265U (en) | 2013-01-18 | 2013-01-18 | Digital processing type frequency modulation synchronized broadcasting exciter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580954A (en) * | 2013-10-18 | 2015-04-29 | 北京同方吉兆科技有限公司 | Full digital domain broadcast television exciter |
| 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 |
| CN107888209A (en) * | 2017-12-08 | 2018-04-06 | 北京航天广通科技有限公司 | A kind of four-way driver |
| CN110350892A (en) * | 2019-07-24 | 2019-10-18 | 中北大学 | A kind of time-delay mechanism and method based on DDS clock phase shift technology |
| CN113037413A (en) * | 2021-03-11 | 2021-06-25 | 成都德芯数字科技股份有限公司 | Frequency modulation synchronization method, device, system, equipment and storage medium |
-
2013
- 2013-01-18 CN CN 201320026652 patent/CN203027265U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580954A (en) * | 2013-10-18 | 2015-04-29 | 北京同方吉兆科技有限公司 | Full digital domain broadcast television exciter |
| 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 |
| CN107888209A (en) * | 2017-12-08 | 2018-04-06 | 北京航天广通科技有限公司 | A kind of four-way driver |
| CN110350892A (en) * | 2019-07-24 | 2019-10-18 | 中北大学 | A kind of time-delay mechanism and method based on DDS clock phase shift technology |
| CN110350892B (en) * | 2019-07-24 | 2023-03-31 | 中北大学 | Time delay device and method based on DDS clock phase shift technology |
| CN113037413A (en) * | 2021-03-11 | 2021-06-25 | 成都德芯数字科技股份有限公司 | Frequency modulation synchronization method, device, system, equipment and storage medium |
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Granted publication date: 20130626 |
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| CX01 | Expiry of patent term |