CN203289595U - Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators - Google Patents
Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators Download PDFInfo
- Publication number
- CN203289595U CN203289595U CN2013202458176U CN201320245817U CN203289595U CN 203289595 U CN203289595 U CN 203289595U CN 2013202458176 U CN2013202458176 U CN 2013202458176U CN 201320245817 U CN201320245817 U CN 201320245817U CN 203289595 U CN203289595 U CN 203289595U
- Authority
- CN
- China
- Prior art keywords
- digital
- frequency synthesizer
- digital frequency
- channel module
- baseband processor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Transceivers (AREA)
- Transmitters (AREA)
Abstract
The utility model relates to the technical field of wireless communication, and provides a digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators, which is simple in circuit, low in production cost and convenient to debug, and uses the digital frequency synthesizers as signal sources for transmitting local oscillation signals. The digital DMR interphone comprises an MCU (micro controller unit), wherein the MCU is connected with a transmission channel module, a reception channel module and a base-band processor respectively; a first digital frequency synthesizer is further connected between the transmission channel module and the MCU; a voltage-controlled crystal oscillator is connected between the base-band processor and the first digital frequency synthesizer; the MCU is further sequentially connected with an audio power amplifier and a loudspeaker; the base-band processor is externally connected with a microphone; the audio power amplifier is further connected with the base-band processor; and the base-band processor is further sequentially connected with a second digital frequency synthesizer and the reception channel module via the voltage-controlled crystal oscillator.
Description
Technical field
The utility model relates to the wireless communication technique field, and 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 the amplifying signal from radio frequency with from the first local oscillation signal of phase-locked loop frequency synthesizer circuit in the first frequency mixer place mixing and generate the 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 wider, 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 flexibility, can't meet the autgmentability demand of practical application.
Summary of the invention
Therefore,, for above-mentioned problem, the utility model proposes that a kind of circuit is simple, production cost is low, debugging is convenient, adopting 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 utility model is taked 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 respectively transmission channel module, receiving channel module and baseband processor, also comprise the first digital frequency synthesizer and the second digital frequency synthesizer, also be connected with the first digital frequency synthesizer between described transmission channel module and MCU controller, be connected with VCXO between described baseband processor and the 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 is connected 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 is connected with baseband processor, described baseband processor also connects the second digital frequency synthesizer and receiving channel module successively through VCXO.
Further, described the first digital frequency synthesizer and the second digital frequency synthesizer all adopt the RDA1846S chip.
Further, described baseband processor is connected with respectively vocoder and compensated oscillator.
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 beneficial effects of the utility model are: by adopting 2 digital frequency synthesizers, substitute the traditional circuit of phase-locked loop and VCO, namely adopt two RDA1846S chips, control the 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 processed 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 finally audio frequency power amplifier.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, then deliver to infrasonic shaping circuit, the output square-wave signal is to the MCU controller, solve simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, and by loud speaker, exported, it is high that the RDA1846S chip itself has integrated level, with integrated hundreds of discrete devices and the integrated circuit of having substituted in traditional scheme of single-chip, significantly simplified circuit design, reduced cost, supply district is wide, can support 2.7～5.5V, can need to regulate according to oneself, greatly increased the flexibility of design, the debugging design is convenient.
Description of drawings
Fig. 1 is circuit system block diagram of the present utility model.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
with reference to figure 1, of the present utility model a kind of be the digital DMR intercom of local oscillator based on digital frequency synthesizer, comprise radiating circuit and receiving circuit, also comprise the first digital frequency synthesizer 31 and the second digital frequency synthesizer 24, described the first digital frequency synthesizer 31 and the second digital frequency synthesizer 24 all adopt the RDA1846S chip, described radiating circuit comprises the transmission channel module 30 that connects successively, the 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 to control the 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 the first digital frequency synthesizer 31, after the audio signal that microphone 5 receives is processed 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 the first digital frequency synthesizer 31 in conjunction with MCU controller 1, go out by antenna transmission after transmission channel module 30 filtered signals, described baseband processor 4 is connected with respectively vocoder 42 and compensated oscillator 43, described vocoder 42 carries out signal decoding in conjunction with baseband processor 4, be reduced into voice clearly, compensated oscillator 43 provides frequency to harmonize, vocoder 42 adopts AMBE3000, because the encoding and decoding in its chip can synchronously be carried out, therefore 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 digital frequency synthesizer 31, effectively frequency modulation is consistent.
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 is from the antenna reception input signal, 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 signal shaping processes, finally by carried out audio frequency output by audio power amplifier 6 and loud speaker 7, described baseband processor 4 also connects the second digital frequency synthesizer 24 and receiving channel module 20 successively through VCXO 41, the 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 finally audio frequency power amplifier 6.The infrasonic frequency signal is delivered to the low pass filter 22 of 270Hz by the signal of frequency discriminator 21 demodulation outputs, the following signal of output 270Hz, then deliver to the shaping circuit of infrasonic frequency 23, 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 utility model is by adopting 2 digital frequency synthesizers to substitute the traditional circuit of phase-locked loop and VCO, namely adopt two RDA1846S chips, control the 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 processed 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 finally audio frequency power amplifier.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, then deliver to infrasonic shaping circuit, the output square-wave signal is to the MCU controller, solve simulation infrasonic frequency or digital infrasonic frequency by the MCU controller, and by loud speaker, exported, it is high that the RDA1846S chip itself has integrated level, with integrated hundreds of discrete devices and the integrated circuit of having substituted in traditional scheme of single-chip, significantly simplified circuit design, reduced cost, supply district is wide, can support 2.7～5.5V, can need to regulate according to oneself, greatly increased the flexibility of design, the debugging design is convenient.
Although in conjunction with preferred embodiment, specifically show and introduced the utility model; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.
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 respectively transmission channel module (30), receiving channel module (20) and baseband processor (4), it is characterized in that: also comprise the first digital frequency synthesizer (31) and the second digital frequency synthesizer (24), also be connected with the first digital frequency synthesizer (31) between described transmission channel module (30) and MCU controller (1), be connected with VCXO (41) between described baseband processor (4) and the 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) is connected 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 is connected with baseband processor (4), described baseband processor (4) also connects the 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 the first digital frequency synthesizer (31) and the 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 respectively vocoder (42) and compensated oscillator (43).
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 20 with transmission channel module (30) with receiving channel module respectively by electric adjusting power device (3)) be connected.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202458176U CN203289595U (en) | 2013-03-04 | 2013-05-08 | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320096722.2 | 2013-03-04 | ||
| CN201320096722 | 2013-03-04 | ||
| CN2013202458176U CN203289595U (en) | 2013-03-04 | 2013-05-08 | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289595U true CN203289595U (en) | 2013-11-13 |
Family
ID=48927641
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101680440A Pending CN103248391A (en) | 2013-03-04 | 2013-05-08 | Digital DMR interphone using digital frequency synthesizer as local oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN203289595U (en) |
Cited By (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) |
| CN112756855A (en) * | 2020-12-23 | 2021-05-07 | 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (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 |
| CN102801438B (en) * | 2012-07-11 | 2014-06-25 | 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
Cited By (3)
| 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) |
| CN112756855A (en) * | 2020-12-23 | 2021-05-07 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103248391A (en) | 2013-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103138796A (en) | Data management routine (DMR) digital interphone supporting relaying and forwarding of identical and different frequencies | |
| TW201325298A (en) | Concurrent use of single TX/RX synthesizer pair in multiple SIM devices | |
| US20060280270A1 (en) | Method and system for FM communication | |
| CN206490667U (en) | A kind of digital intercom chip and digital intercom equipment | |
| CN203289595U (en) | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators | |
| CN101127932A (en) | An integrated talk back module and talk back system based on this module | |
| CN103731767A (en) | Wireless microphone system based on digital pilot frequency and working method thereof | |
| CN105634529A (en) | Intelligent interphone with Bluetooth automatic adaption frequency | |
| US20160037448A1 (en) | Apparatus, System, and Method for Parallelizing UE Wakeup Process | |
| CN204795013U (en) | Mixed intercom of ECHAT public network and private network | |
| CN101917206B (en) | Integrated talkback chip and integrated talkback system with dual tone multiple frequency coding and decoding function | |
| CN205490529U (en) | Anti -interference digit transmission device of VHF | |
| CN203261323U (en) | Digital DPMR interphone based on digital frequency synthesizer single point modulation | |
| CN203166905U (en) | DMR digital interphone supporting same-and-different frequency relay forwarding | |
| CN204290955U (en) | A kind of digital handset | |
| CN202395808U (en) | Single-point modulation wireless communication device | |
| CN202475405U (en) | Audio receiver, portable equipment with same, and audio communication system | |
| CN203166895U (en) | DMR/DPMR interphone based on single-point modulation | |
| CN206627778U (en) | Multifunctional intellectual wrist-watch system based on mobile terminal | |
| CN202374403U (en) | Short-wave channel digital interphone | |
| CN203261347U (en) | Multichannel wireless audio transmission system | |
| CN102790640B (en) | Field programmable gate array (FPGA) based multi-system, multi-band and multi-carrier digital repeater | |
| CN206181023U (en) | LTE broadband cluster intelligent Mobile Terminal | |
| CN205584194U (en) | DMR data signal transfer circuit | |
| CN207200689U (en) | A kind of digital intercom chip and digital intercom equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Digital DMR interphone using digital frequency synthesizer as local oscillator Effective date of registration: 20170214 Granted publication date: 20131113 Pledgee: Industrial Bank Limited by Share Ltd Quanzhou branch Pledgor: Fujian Wanhua Electronics & Technology Co., Ltd. Registration number: 2017350000022 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20200508 |