CN103248391A - Digital DMR interphone using digital frequency synthesizer as local oscillator - Google Patents
Digital DMR interphone using digital frequency synthesizer as local oscillator Download PDFInfo
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- CN103248391A CN103248391A CN2013101680440A CN201310168044A CN103248391A CN 103248391 A CN103248391 A CN 103248391A CN 2013101680440 A CN2013101680440 A CN 2013101680440A CN 201310168044 A CN201310168044 A CN 201310168044A CN 103248391 A CN103248391 A CN 103248391A
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Abstract
The invention relates to the technical field of wireless communication, and provides a digital DMR (Digital Media Receiver) interphone using a digital frequency synthesizer as a local oscillator, which is simple in circuit, low in manufacturing cost and convenient for debugging, and utilizes the digital frequency synthesizer as a signal source to emit a local oscillator signal. The digital DMR interphone comprises a MCU (Microprogrammed Control Unit) respectively connected to a transmitting channel module, a receiving channel module and a baseband processor, wherein a digital frequency synthesizer is arranged between the transmitting channel module and the MCU; a crystal voltage-controlled oscillator is connected between the baseband processor and a first digital frequency synthesizer; the MCU is further sequentially connected to an audio frequency amplifier and a loudspeaker; the baseband processor is connected to a microphone externally; the audio frequency amplifier is further connected to the baseband processor; and the baseband processor is further sequentially connected to a second digital frequency synthesizer and the receiving channel through the crystal voltage-controlled oscillator.
Description
Technical field
The present invention relates to the wireless communication technique field, particularly a kind of is the digital DMR intercom of local oscillator based on digital frequency synthesizer.
Background technology
Development along with radio communication technology, people have had higher requirement to the quality of radio communication, but Radio Spectrum Resource lacks again day by day, the appearance of digital handset, provide abundanter, open, powerful type of service and user's request, as everyone knows, the DMR trunked communication system adopts the TDMA technology based on 2 time slots, its receiving unit be with from the amplifying signal of radio frequency with from first local oscillation signal of phase-locked loop frequency synthesizer circuit in the first frequency mixer place mixing and generate first intermediate-freuqncy signal, and then through filtering, obtain the required information of people after the Treatment Analysis such as amplification, all adopt the traditional circuit mode of phase-locked loop and VCO, because DMR system requirements covering frequence is wideer, but the debugging of the circuit mode of common VCO is difficulty comparatively, integrated functionality is poor, be difficult in coverage, performance, all reach satisfied requirement in cost and the flexibility, can't satisfy the autgmentability demand of practical application.
Summary of the invention
Therefore, at above-mentioned problem, the present invention proposes that a kind of circuit is simple, production cost is low, debugging is convenient, adopt digital frequency synthesizer is the digital DMR intercom of local oscillator as signal source emission local oscillation signal based on digital frequency synthesizer.
For solving this technical problem, the present invention takes following scheme: a kind of is the digital DMR intercom of local oscillator based on digital frequency synthesizer, comprise the MCU controller, described MCU controller is connected with transmission channel module respectively, receiving channel module and baseband processor, also comprise first digital frequency synthesizer and second digital frequency synthesizer, also be connected with first digital frequency synthesizer between described transmission channel module and the MCU controller, be connected with VCXO between described baseband processor and first digital frequency synthesizer, described receiving channel module is connected with frequency discriminator in turn, low pass filter, the infrasonic frequency device, described infrasonic frequency device links to each other with the MCU controller, described MCU controller also is connected with audio power amplifier and loud speaker in turn, described baseband processor is circumscribed with microphone, described audio power amplifier also links to each other with baseband processor, and described baseband processor also connects second digital frequency synthesizer and receiving channel module successively through VCXO.
Further, described first digital frequency synthesizer and second digital frequency synthesizer all adopt the RDA1846S chip.
Further, described baseband processor is connected with vocoder and temperature compensation oscillator respectively.
Further, described MCU controller also is connected with receiving channel module with transmission channel module respectively by electric adjusting power device.
Further described baseband processor adopts the HR-C5000 chip.
Further, described VCXO adopts the VC-TCXO oscillator of 13MHz.
By adopting the aforementioned techniques scheme, the invention has the beneficial effects as follows: substitute the traditional circuit of phase-locked loop and VCO by adopting 2 digital frequency synthesizers, namely adopt two RDA1846S chips, control first digital frequency synthesizer (namely launching RDA1846S) output simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, after the audio signal of microphone is handled by the analog channel of baseband processor chip HR-C5000, deliver to the frequency adjustment end of the VC-TCXO of emission RDA1846S, by emission RDA1846S modulate emission.During reception by frequency discriminator be set to the second frequency synthesizer (local oscillator RDA1846S) of radiation pattern output local oscillation signal, both signals are mixed into the 450KHz intermediate-freuqncy signal and deliver to baseband processor chip HR-C5000, after carrying out the audio signal demodulation process by it, deliver to audio frequency power amplifier at last.The infrasonic frequency signal is delivered to the low pass filter of 270Hz by the signal of frequency discriminator demodulation output, the following signal of output 270Hz, deliver to infrasonic shaping circuit then, the output square-wave signal is to the MCU controller, solve simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, and exported by loud speaker, the RDA1846S chip itself has the integrated level height, with integrated hundreds of discrete devices and the integrated circuit of having substituted in the traditional scheme of single-chip, significantly simplified circuit design, reduced cost, supply district is wide, can support 2.7～5.5V, can regulate according to own needs, increase the flexibility of design greatly, the debugging design is convenient.
Description of drawings
Fig. 1 is circuit system block diagram of the present invention.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
With reference to figure 1, of the present invention a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, comprise radiating circuit and receiving circuit, also comprise first digital frequency synthesizer 31 and second digital frequency synthesizer 24, described first digital frequency synthesizer 31 and second digital frequency synthesizer 24 all adopt the RDA1846S chip, described radiating circuit comprises the transmission channel module 30 that connects successively, first digital frequency synthesizer 31, MCU controller 1, baseband processor 4 and microphone 5, described MCU controller 1 adopts the STM32F103VF chip, baseband processor 4 adopts the HR-C5000 chip, when transmit frequency signal: the input signal by microphone 5 is delivered to MCU controller 1 after the Treatment Analysis of baseband processor 4, coordinate control first digital frequency synthesizer 31 by MCU controller 1 and produce the radiofrequency signal of emission, thereby output simulation infrasonic frequency or digital infrasonic frequency, be connected with VCXO 41 between described baseband processor 4 and first digital frequency synthesizer 31, after the audio signal that microphone 5 receives is handled by the analog channel of baseband processor 4, input to the frequency adjustment end of VCXO 41, and by the time slot handover operation of first digital frequency synthesizer 31 in conjunction with MCU controller 1, behind transmission channel module 30 filtered signals, launch by antenna, described baseband processor 4 is connected with vocoder 42 and temperature compensation oscillator 43 respectively, described vocoder 42 carries out signal decoding in conjunction with baseband processor 4, be reduced into voice clearly, temperature compensation oscillator 43 provides frequency to harmonize, vocoder 42 adopts AMBE3000, because the encoding and decoding in its chip can be carried out synchronously, so can support full-duplex communication mode completely, use modulation convenient, be connected with the VCXO 41 of the VC-TCXO oscillator that adopts 13MHz between described baseband processor 4 and the digital frequency synthesizer 31, effectively the frequency modulation unanimity.
Described receiving circuit comprises the receiving channel module 20 that connects successively, frequency discriminator 21, low pass filter 22, infrasonic frequency device 23, MCU controller 1, audio power amplifier 6 and loud speaker 7, described receiving channel module 20 receives input signal from antenna, through frequency discriminator 21, low pass filter 22 and infrasonic frequency device 23, carry out frequency discrimination, sending to MCU controller 1 after filtering and the signal shaping handles, finally by carried out audio frequency output by audio power amplifier 6 and loud speaker 7, described baseband processor 4 also connects second digital frequency synthesizer 24 and receiving channel module 20 successively through VCXO 41, second digital frequency synthesizer 24 adopts radiation pattern to be set to export the RDA1846S chip of local oscillation signal, input signal and local oscillation signal are mixed into the 450KHz intermediate-freuqncy signal and deliver to baseband processor 4 and MCU controller 1, after carrying out the audio signal demodulation process by it, deliver to audio frequency power amplifier 6 at last.The infrasonic frequency signal is delivered to the low pass filter 22 of 270Hz by the signal of frequency discriminator 21 demodulation output, the following signal of output 270Hz, deliver to the shaping circuit of infrasonic frequency 23 then, the output square-wave signal is to MCU controller 1, solve simulation infrasonic frequency or digital infrasonic frequency by MCU controller 1, and by loud speaker output, described MCU controller 1 also is circumscribed with crystal oscillator 8, effectively auxiliary resonance frequency modulation.
The present invention substitutes the traditional circuit of phase-locked loop and VCO by adopting 2 digital frequency synthesizers, namely adopt two RDA1846S chips, control first digital frequency synthesizer (namely launching RDA1846S) output simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, after the audio signal of microphone is handled by the analog channel of baseband processor chip HR-C5000, deliver to the frequency adjustment end of the VC-TCXO of emission RDA1846S, by emission RDA1846S modulate emission.During reception by frequency discriminator be set to the second frequency synthesizer (local oscillator RDA1846S) of radiation pattern output local oscillation signal, both signals are mixed into the 450KHz intermediate-freuqncy signal and deliver to baseband processor chip HR-C5000, after carrying out the audio signal demodulation process by it, deliver to audio frequency power amplifier at last.The infrasonic frequency signal is delivered to the low pass filter of 270Hz by the signal of frequency discriminator demodulation output, the following signal of output 270Hz, deliver to infrasonic shaping circuit then, the output square-wave signal is to the MCU controller, solve simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, and exported by loud speaker, the RDA1846S chip itself has the integrated level height, with integrated hundreds of discrete devices and the integrated circuit of having substituted in the traditional scheme of single-chip, significantly simplified circuit design, reduced cost, supply district is wide, can support 2.7～5.5V, can regulate according to own needs, increase the flexibility of design greatly, the debugging design is convenient.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in not breaking away from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (6)
1. one kind is the digital DMR intercom of local oscillator based on digital frequency synthesizer, comprise MCU controller (1), described MCU controller (1) is connected with transmission channel module (30) respectively, receiving channel module (20) and baseband processor (4), it is characterized in that: also comprise first digital frequency synthesizer (31) and second digital frequency synthesizer (24), also be connected with first digital frequency synthesizer (31) between described transmission channel module (30) and the MCU controller (1), be connected with VCXO (41) between described baseband processor (4) and first digital frequency synthesizer (31), described receiving channel module (20) is connected with frequency discriminator (21) in turn, low pass filter (22), infrasonic frequency device (23), described infrasonic frequency device (23) links to each other with MCU controller (1), described MCU controller (1) also is connected with audio power amplifier (6) and loud speaker (7) in turn, described baseband processor (4) is circumscribed with microphone (5), described audio power amplifier (6) also links to each other with baseband processor (4), and described baseband processor (4) also connects second digital frequency synthesizer (24) and receiving channel module (20) successively through VCXO (41).
According to claim 1 a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, it is characterized in that: described first digital frequency synthesizer (31) and second digital frequency synthesizer (24) all adopt the RDA1846S chip.
According to claim 1 a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, it is characterized in that: described baseband processor (4) is connected with vocoder (42) and temperature compensation oscillator (43) respectively.
According to claim 1 or 3 described a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, it is characterized in that: described MCU controller (1) also is connected with receiving channel module (20) with transmission channel module (30) respectively by electric adjusting power device (3).
According to claim 3 a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, it is characterized in that: described baseband processor (4) adopts the HR-C5000 chip.
According to claim 1 a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, it is characterized in that: described VCXO (41) adopts the VC-TCXO oscillator of 13MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101680440A CN103248391A (en) | 2013-03-04 | 2013-05-08 | Digital DMR interphone using digital frequency synthesizer as local oscillator |
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| CN201320096722.2 | 2013-03-04 | ||
| CN201320096722 | 2013-03-04 | ||
| CN2013101680440A CN103248391A (en) | 2013-03-04 | 2013-05-08 | Digital DMR interphone using digital frequency synthesizer as local oscillator |
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| CN103248391A true CN103248391A (en) | 2013-08-14 |
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| CN2013202458176U Expired - Fee Related CN203289595U (en) | 2013-03-04 | 2013-05-08 | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators |
| CN2013101680440A Pending CN103248391A (en) | 2013-03-04 | 2013-05-08 | Digital DMR interphone using digital frequency synthesizer as local oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038247A (en) * | 2014-06-17 | 2014-09-10 | 无锡交大联云科技有限公司 | Method for rapidly receiving data and matched filtering applicable to DMR (Digital Mobile Radio) |
| CN112756855B (en) * | 2020-12-23 | 2022-12-27 | 烟台万华电子材料有限公司 | Method for welding and connecting two pipe fittings by adopting pipe fitting welding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642027A (en) * | 2005-01-04 | 2005-07-20 | 华南理工大学 | 400M common frequency range digital intercom and method for realizing said communication |
| CN2922294Y (en) * | 2006-04-13 | 2007-07-11 | 林文 | Duplex intercom |
| CN202395808U (en) * | 2011-10-26 | 2012-08-22 | 杜清海 | Single-point modulation wireless communication device |
| CN102801438A (en) * | 2012-07-11 | 2012-11-28 | 深圳九洲海全通科技股份有限公司 | Handheld type wireless maritime affair interphone |
-
2013
- 2013-05-08 CN CN2013202458176U patent/CN203289595U/en not_active Expired - Fee Related
- 2013-05-08 CN CN2013101680440A patent/CN103248391A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642027A (en) * | 2005-01-04 | 2005-07-20 | 华南理工大学 | 400M common frequency range digital intercom and method for realizing said communication |
| CN2922294Y (en) * | 2006-04-13 | 2007-07-11 | 林文 | Duplex intercom |
| CN202395808U (en) * | 2011-10-26 | 2012-08-22 | 杜清海 | Single-point modulation wireless communication device |
| CN102801438A (en) * | 2012-07-11 | 2012-11-28 | 深圳九洲海全通科技股份有限公司 | Handheld type wireless maritime affair interphone |
Non-Patent Citations (1)
| Title |
|---|
| RDA MICROELECTRONICS: "RDA1846 single chip transceiver for walkie talkie", 《RDA MICROELECTRONICS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
| CN107294554B (en) * | 2017-07-28 | 2023-09-12 | 泉州市琪祥电子科技有限公司 | Single-frequency vehicle-mounted interphone |
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| CN203289595U (en) | 2013-11-13 |
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Application publication date: 20130814 |