CN109413564A - A kind of talkback system and its application method - Google Patents
A kind of talkback system and its application method Download PDFInfo
- Publication number
- CN109413564A CN109413564A CN201810001407.4A CN201810001407A CN109413564A CN 109413564 A CN109413564 A CN 109413564A CN 201810001407 A CN201810001407 A CN 201810001407A CN 109413564 A CN109413564 A CN 109413564A
- Authority
- CN
- China
- Prior art keywords
- module
- intercom
- mcu control
- user
- short message
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of talkback system and its application method, including MCU control module, short message communication module, Beidou positioning module, baseband processing module, CODEC module, RF receiving and transmission module, write frequency module, key, LCD display, loudspeaker, microphone；MCU control module is connected with modules, for controlling co-ordination between modules；The present invention can acquire the location information of intercom by Beidou positioning module, and it is shown by LCD display, and the location information real-time Transmission to background server can be enable the operator of background server get information about the position distribution of intercom by user in this way；Simultaneously, when carrying out telecommunication, intercom can send short message information by short message communication module, positioning can either be realized in this way, the location information of user can be sent again, long haul communication is realized, solves that traditional intercom function is single, communication efficiency is low, the short problem of communication distance.
Description
Technical field
The present invention relates to communication technique field, specially a kind of talkback system and its application method.
Background technique
Intercom is a kind of bidirectional mobile communication instrument, in the case where not needing any network support, so that it may it converses,
There is no telephone expenses generation, suitable for relatively fixed and frequently conversing occasion.With the continuous development of the communication technology, intercom is answered
It is also more and more extensive with field, not only it is widely used in the neck such as fire monitoring, flood control command, vehicle scheduling, communications and transportation
Domain, also initially enters commercial market, and people's out on tours, shopping also start more and more to use intercom.
Currently, traditional intercom is only able to achieve intercommunication function, handed over mainly as communication small-scale between member of community
Stream tool realizes short-range wireless communication function.Such as when accessible opening uses intercom, communication distance is logical
It often can reach 5 kilometers；Under the support of cordless communication network, intercom can reach 10-20 kilometers by intermediate station communication distance.
But in the case where adverse circumstances, when handling emergency, intercom is limited by communication distance, it is difficult to be realized long-range logical
Letter, reduces communication efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of talkback system and its application methods, to solve to mention in above-mentioned background technique
The problem that intercom function out is single, communication distance is short, communication efficiency is low.
To achieve the above object, the invention provides the following technical scheme: a kind of talkback system, including it is each for controlling
The MCU control module of co-ordination, the short message for acquiring and sending location information and short message information communicate between module
Module, the Beidou positioning module for acquiring intercom position information, the baseband processing module of data processing core, for sound
Frequency signal carries out the CODEC module of A/D and D/A conversion, the radio-frequency receiving-transmitting mould for sending and receiving intercom radiofrequency signal
Block, for configure intercommunication unit frequency write frequency module, for complete machine power supply power module and key, LCD display, loudspeaking
Device, microphone；Wherein, short message communication module, Beidou positioning module and baseband processing module with the two-way company of MCU control module
It connects, is unidirectionally connected with key in MCU control module respectively, LCD display, loudspeaker, microphone, writes frequency module and volume current potential
Device；It has been bi-directionally connected CODEC module on baseband processing module, has been bi-directionally connected RF receiving and transmission module in CODEC module；
The short message communication module realizes bi-directional communication function, including user and user, user and backstage by satellite
Two-way brief digital message communication, and the short message information that the location information of user and user are edited can be achieved between server
Encrypted, according to the control instruction sent from MCU control module, by encrypted location information and short message information according to
Satellite is sent in other side's intercom, meanwhile, the location information that short message communication module sends reception from other side's intercom
And short message information, and be sent to MCU control module and shown by LCD display；
The location information of user, Beidou positioning are calculated by acquisition Big Dipper satellite signal for the Beidou positioning module
Module receives the control instruction sent from MCU control module, and the location information acquired in real time is passed through nothing by Beidou positioning module
Line transmission mode is sent to background server, monitors and command the user for carrying intercom in real time by background server.
Preferably, the key include intercom side is set report key and SOS alarm key, for MCU
Control module transmission reports signal and SOS alarm signal.
Preferably, the LCD display is connect with MCU control module, for showing the location information of collected user
And the numeric literal information that user edits.
Preferably, the volume potentiometer, connect with MCU control module, for adjusting intercom volume.
Preferably, the loudspeaker is connect with MCU control module, for converting the electrical signal to audio signal.
Preferably, the microphone is connect with MCU control module, for converting audio signals into electric signal.
The present invention provides a kind of another technical solution: application method of talkback system, comprising the following steps:
S1: when sending signal, sound is incoming from microphone, and microphone converts voice signals into telecommunications by MCU control module
Number, and electric signal is sent to baseband processing module by MCU control module；
S2: the electric signal received is compiled into the base band code for emitting by baseband processing module, and passes through CODEC module
Digital-to-analogue conversion is carried out, i.e., digital baseband code is converted into Analog Baseband code；
S3: the Analog Baseband code after conversion is sent in other side's intercom by RF receiving and transmission module；
S4: when other side's intercom receives signal, RF receiving and transmission module receives the base band code from other side's intercom, and passes through
CODEC module carries out analog-to-digital conversion, i.e., Analog Baseband code is converted into digital baseband code；
The digital baseband code received: being decoded by S5 by baseband processing module, is reduced into voice signal, and by raising
Sound device carries out voice broadcasting.
Compared with prior art, the beneficial effects of the present invention are:
This talkback system and its application method can acquire the location information of intercom by Beidou positioning module,
And it is shown by LCD display, and user can be by the location information real-time Transmission to background server, after can making in this way
The operator of platform server can get information about the position distribution of intercom；Meanwhile when carrying out telecommunication, this hair
The intercom of bright offer can send short message information by short message communication module, can either realize positioning in this way, and can send out
The location information for sending user, realizes long haul communication, solves that traditional intercom function is single, communication efficiency is low, communication
Apart from short problem.
Detailed description of the invention
Fig. 1 is module control principle figure of the invention；
Fig. 2 is intercom work connection figure of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
Referring to Fig. 1, in the embodiment of the present invention: a kind of talkback system, including coordinate between modules for controlling
The MCU control module of work, the short message communication module for acquiring and sending location information and short message information, for acquiring
The Beidou positioning module of intercom position information, the baseband processing module of data processing core, for being counted to audio signal
The CODEC module of mould and analog-to-digital conversion, is used for configuration pair at the RF receiving and transmission module for sending and receiving intercom radiofrequency signal
Say the power module and key, LCD display, loudspeaker, microphone of unit frequency writing frequency module, powering for complete machine；Short message
Communication module, Beidou positioning module and baseband processing module are bi-directionally connected with MCU control module, in MCU control module respectively
Unidirectionally it is connected with key, LCD display, loudspeaker, microphone, writes frequency module and volume potentiometer；It is two-way on baseband processing module
It is connected with CODEC module, has been bi-directionally connected RF receiving and transmission module in CODEC module.
Wherein, short message communication module can realize bi-directional communication function using satellite, i.e. user and user, user is with after
Two-way brief digital message communication can be achieved between platform server；Short message communication module can issue the information of 140 words, and
It can be realized positioning；In the place that signal of communication can not cover or it is in the case that communication base station is destroyed or is remote
When distance communication, intercom provided by the invention can position the position of user in time by short message communication module, obtain and use
The location information at family, and can outwardly issue text information；Meanwhile user can also active photos and sending messages inform it is extraneous oneself
Location information.
Exemplary, when carrying out telecommunication, short message communication module can be compiled the location information of user and user
The short message information collected is encrypted, and according to the control instruction sent from MCU control module, encrypted position is believed
Breath and short message information are sent in other side's intercom according to satellite；Meanwhile short message communication module also can receive from pair
The location information and short message information that square intercom is sent, and it is sent to MCU control module, it is shown by LCD display.
In addition, the present invention can obtain the location information of intercom in real time using Beidou positioning module, there is positioning function
Can, i.e., the location information of user can be calculated in Beidou positioning module by acquisition Big Dipper satellite signal, and can incite somebody to action
The location information is transmitted to background server, specifically, when the control that Beidou positioning module receives MCU control module transmission refers to
After order, the location information acquired in real time can be sent to background server with wireless transmission method by Beidou positioning module, so as to
It can monitor and command the user for carrying intercom in real time in background server；Wherein, the location information include longitude, latitude,
The information such as speed and height；Wireless transmission method refers to transmitting by short message communication module 2, when MCU control module 1 monitors
When to police instruction, control command, the i.e. available Beidou positioning module of MCU control module 1 can be sent to Beidou positioning module 3
The location informations of 3 acquisitions, and are sent to short message communication module 2 for the location information, are sent to by satellite and background service
The receiver that device is connected, and then it is sent to background server.
In the embodiment of the present invention, intercom further includes writing frequency module to be attached with MCU control module；User can basis
It is same to organize the frequency of other intercoms to configure the frequency of the intercom, meanwhile, which further includes having volume potentiometer, is used for
The volume for adjusting intercom can control specifically, being connected with sound adjusting knob on volume potentiometer by rotating the knob
The volume of intercom；Intercom further includes that the SOS alarm key of intercom side is arranged in and reports key, has SOS alarm
Function, in practical applications, when in case of emergency, user can press the SOS alarm key on intercom, MCU control
Warning message can be sent to background server according to the police instruction monitored by module in a manner of being wirelessly transferred, wireless to pass
Defeated principle is same as described above, and therefore not to repeat here；By reporting key that can also be uploaded in real time the location information of intercom
Background server；When in case of emergency, user can press this and report key, i.e. MCU control module can monitor
Report instruction, and send control instruction to Beidou positioning module, then Beidou positioning module can be instructed according to the control received, will be adopted
The location information of collection is sent to background server in a manner of being wirelessly transferred, and facilitates consistency operation personnel that can obtain use in time
The location information at family, wireless transmission principles are same as described above, and therefore not to repeat here；In addition, be additionally provided on intercom PTT by
Key, switch key and input key, PTT key are arranged in the side of intercom, facilitate user to press PTT key in time and say
Words；The top of intercommunication is arranged in switch key, for open and close intercom, switching channel and contact person；Input key setting
In the front of intercom, user can rapidly input number, editor's text by the input key；In practical application, the intercommunication
It is additionally provided with LCD display on machine to connect with MCU control module, which can show and be acquired by Beidou positioning module
User location information, i.e. the location information of the user of acquisition can be sent to MCU control module by Beidou positioning module, so
It is shown afterwards by LCD display, meanwhile, which can also show the position of the user sent by other side's intercom
Information and short message information.
Embodiment two:
Referring to Fig. 2, a description based on the above embodiment: the present invention provides a kind of application method of talkback system, packet
Include following steps:
Step 1: sound is incoming from microphone, and microphone is converted voice signals by MCU control module when sending signal
Electric signal, and electric signal is sent to baseband processing module by MCU control module；
Step 2: the electric signal received is compiled into the base band code for emitting by baseband processing module, and pass through CODEC
Module carries out digital-to-analogue conversion, i.e., digital baseband code is converted to Analog Baseband code；
Step 3: the Analog Baseband code after conversion is sent in other side's intercom by RF receiving and transmission module；
Step 4: RF receiving and transmission module receives the base band code from other side's intercom when other side's intercom receives signal, and
Analog-to-digital conversion is carried out by CODEC module, i.e., Analog Baseband code is converted into digital baseband code；
Step 5: the digital baseband code received is decoded by baseband processing module, be reduced into voice signal, and lead to
It crosses loudspeaker and carries out voice broadcasting.
In summary: talkback system and its application method provided by the invention can be adopted by Beidou positioning module
The location information for collecting intercom, and is shown by LCD display, and user can be by the location information real-time Transmission to rear
Platform server can enable the operator of background server get information about the position distribution of intercom in this way；Meanwhile into
When row telecommunication, intercom provided by the invention can send short message information by short message communication module, so both
It can be realized positioning, and the location information of user can be sent, realize long haul communication, solve traditional intercom function list
One, communication efficiency is low, the short problem of communication distance.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of talkback system, which is characterized in that control mould including the MCU for controlling co-ordination between modules
Block, the short message communication module for acquiring and sending location information and short message information, for acquiring intercom position information
Beidou positioning module, data processing core baseband processing module, for carrying out A/D and D/A conversion to audio signal
CODEC module, the RF receiving and transmission module for sending and receiving intercom radiofrequency signal, for configure intercommunication unit frequency write frequency
Module, the power module and key, LCD display, loudspeaker, microphone powered for complete machine；The short message communication module, north
Bucket locating module and baseband processing module be bi-directionally connected with MCU control module, be unidirectionally connected with respectively in MCU control module by
Key, loudspeaker, microphone, writes frequency module and volume potentiometer at LCD display；It has been bi-directionally connected on the baseband processing module
CODEC module has been bi-directionally connected RF receiving and transmission module in CODEC module；
The short message communication module realizes bi-directional communication function, including user and user, user and background service by satellite
Two-way brief digital message communication can be achieved between device, and the short message information that the location information of user and user are edited carries out
Encryption, according to the control instruction sent from MCU control module, by encrypted location information and short message information according to satellite
It is sent in other side's intercom, meanwhile, short message communication module will receive the location information sent from other side's intercom and short
Message information, and be sent to MCU control module and shown by LCD display；
The location information of user, Beidou positioning module are calculated by acquisition Big Dipper satellite signal for the Beidou positioning module
The control instruction sent from MCU control module is received, Beidou positioning module is by the location information acquired in real time by wirelessly passing
Defeated mode is sent to background server, monitors and command the user for carrying intercom in real time by background server.
2. a kind of talkback system as described in claim 1, it is characterised in that: the key includes being arranged in intercom side
Report key and SOS alarm key, for MCU control module transmission report signal and SOS alarm signal.
3. a kind of talkback system as described in claim 1, it is characterised in that: the LCD display and MCU control module connect
It connects, the numeric literal information that the location information and user for showing collected user are edited.
4. a kind of talkback system as described in claim 1, it is characterised in that: the volume potentiometer, with MCU control module
Connection, for adjusting intercom volume.
5. a kind of talkback system as described in claim 1, it is characterised in that: the loudspeaker is connect with MCU control module,
For converting the electrical signal to audio signal.
6. a kind of talkback system as described in claim 1, it is characterised in that: the microphone is connect with MCU control module, is used
In converting audio signals into electric signal.
7. a kind of application method of talkback system as described in claim 1, which comprises the following steps:
S1: when sending signal, sound is incoming from microphone, and microphone converts voice signals into electric signal by MCU control module, and
Electric signal is sent to baseband processing module by MCU control module；
S2: the electric signal received is compiled into the base band code for emitting by baseband processing module, and is carried out by CODEC module
Digital baseband code is converted to Analog Baseband code by digital-to-analogue conversion；
S3: the Analog Baseband code after conversion is sent in other side's intercom by RF receiving and transmission module；
S4: when other side's intercom receives signal, RF receiving and transmission module receives the base band code from other side's intercom, and passes through
CODEC module carries out analog-to-digital conversion, i.e., Analog Baseband code is converted into digital baseband code；
S5: the digital baseband code received is decoded by baseband processing module, is reduced into voice signal, and pass through loudspeaker
Carry out voice broadcasting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810001407.4A CN109413564A (en) | 2018-01-02 | 2018-01-02 | A kind of talkback system and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810001407.4A CN109413564A (en) | 2018-01-02 | 2018-01-02 | A kind of talkback system and its application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109413564A true CN109413564A (en) | 2019-03-01 |
Family
ID=65464061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810001407.4A Pending CN109413564A (en) | 2018-01-02 | 2018-01-02 | A kind of talkback system and its application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109413564A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110809086A (en) * | 2019-09-29 | 2020-02-18 | 宁宇 | Nondestructive reminding access equipment of universal mobile station and use method thereof |
| CN111082825A (en) * | 2019-11-29 | 2020-04-28 | 天津七六四通信导航技术有限公司 | Wireless full duplex intercom device |
| CN113419448A (en) * | 2021-06-23 | 2021-09-21 | 力声通信股份有限公司 | A intercom for security protection |
| CN113473062A (en) * | 2021-06-23 | 2021-10-01 | 力声通信股份有限公司 | Intercom with visual function |
| CN113645515A (en) * | 2021-06-17 | 2021-11-12 | 广州启盟信息科技有限公司 | Property scheduling integrated control system, method and device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110081894A1 (en) * | 2009-10-07 | 2011-04-07 | Korea Geospatial Information & Communication Co., Ltd. | System and method for providing ubiquitous service using mobile terminal equipment |
| CN102253395A (en) * | 2011-04-12 | 2011-11-23 | 广州广嘉北斗电子科技有限公司佛山市南海分公司 | Communicator applied to Beidou satellites and method thereof |
| CN103517160A (en) * | 2012-06-20 | 2014-01-15 | 北京宏达科美科技有限公司 | China regional satellite communication navigation talkback handheld terminal |
| CN204272105U (en) * | 2014-12-10 | 2015-04-15 | 华侨大学 | A kind of common template of digital handset |
| CN105049073A (en) * | 2015-06-26 | 2015-11-11 | 北京汇美电子技术有限公司 | Beidou satellite navigation voice interphone |
| CN205643713U (en) * | 2016-05-04 | 2016-10-12 | 江苏星宇芯联电子科技有限公司 | Take voice function's big dipper intercom device |
| CN107171686A (en) * | 2017-05-26 | 2017-09-15 | 泉州力同科技有限公司 | A kind of integrated talkback chip and digital handset |
| CN207665224U (en) * | 2018-01-02 | 2018-07-27 | 北斗天地股份有限公司 | A kind of talkback system |
-
2018
- 2018-01-02 CN CN201810001407.4A patent/CN109413564A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110081894A1 (en) * | 2009-10-07 | 2011-04-07 | Korea Geospatial Information & Communication Co., Ltd. | System and method for providing ubiquitous service using mobile terminal equipment |
| CN102253395A (en) * | 2011-04-12 | 2011-11-23 | 广州广嘉北斗电子科技有限公司佛山市南海分公司 | Communicator applied to Beidou satellites and method thereof |
| CN103517160A (en) * | 2012-06-20 | 2014-01-15 | 北京宏达科美科技有限公司 | China regional satellite communication navigation talkback handheld terminal |
| CN204272105U (en) * | 2014-12-10 | 2015-04-15 | 华侨大学 | A kind of common template of digital handset |
| CN105049073A (en) * | 2015-06-26 | 2015-11-11 | 北京汇美电子技术有限公司 | Beidou satellite navigation voice interphone |
| CN205643713U (en) * | 2016-05-04 | 2016-10-12 | 江苏星宇芯联电子科技有限公司 | Take voice function's big dipper intercom device |
| CN107171686A (en) * | 2017-05-26 | 2017-09-15 | 泉州力同科技有限公司 | A kind of integrated talkback chip and digital handset |
| CN207665224U (en) * | 2018-01-02 | 2018-07-27 | 北斗天地股份有限公司 | A kind of talkback system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110809086A (en) * | 2019-09-29 | 2020-02-18 | 宁宇 | Nondestructive reminding access equipment of universal mobile station and use method thereof |
| CN111082825A (en) * | 2019-11-29 | 2020-04-28 | 天津七六四通信导航技术有限公司 | Wireless full duplex intercom device |
| CN113645515A (en) * | 2021-06-17 | 2021-11-12 | 广州启盟信息科技有限公司 | Property scheduling integrated control system, method and device |
| CN113419448A (en) * | 2021-06-23 | 2021-09-21 | 力声通信股份有限公司 | A intercom for security protection |
| CN113473062A (en) * | 2021-06-23 | 2021-10-01 | 力声通信股份有限公司 | Intercom with visual function |
| CN113473062B (en) * | 2021-06-23 | 2024-03-22 | 力声通信股份有限公司 | Intercommunication system with visual function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109413564A (en) | A kind of talkback system and its application method | |
| US7688203B2 (en) | Surveillance device by use of digital cameras linked to a cellular or wireless telephone | |
| CN107769811B (en) | Whole-network-communication and digital-analog compatible integrated interphone | |
| CN100479517C (en) | Method for superposing voice in transmitting audio-video file | |
| CN107094149B (en) | Digital communication multi-protocol conversion device and use method thereof | |
| CN103888855A (en) | Mobile terminal intercom system supporting concurrence of traditional cluster intercom and public network intercom | |
| CN202679543U (en) | Remote intercommunication connection device and remote intercommunication system | |
| CN207665224U (en) | A kind of talkback system | |
| CN202268987U (en) | Interphone with Big Dipper positioning function | |
| CN106170039A (en) | SOS help-asking system based on Mobile phone talkback machine functional accessory | |
| CN103138835A (en) | Multi-mode spot emergency communication system | |
| CN201123038Y (en) | Electrical power system synthetic short message monitoring system | |
| CN202856722U (en) | Multi-frequency wireless digital-analog compatible mobile communication device and communication system thereof | |
| CN201210679Y (en) | Emergency communication system for railway | |
| CN2938654Y (en) | Station radio communicating device | |
| CN102932028A (en) | Multi-frequency wireless digital-analog compatible mobile communication device and communication system thereof | |
| CN102547637A (en) | Multi-mode field emergency communication system | |
| CN106850932B (en) | Digital intelligent voice call system | |
| CN206302417U (en) | A kind of field flight system of use Audiotechnica | |
| CN212572537U (en) | Ultrashort wave cluster communication scheduling system of communication command car | |
| CN206506598U (en) | A kind of individual soldier's broadband wireless access terminal | |
| CN204465677U (en) | A kind of mining wireless communication system | |
| CN206060745U (en) | A kind of multifunctional protection transmitter receiver of DA compatibility | |
| CN201045670Y (en) | Intelligent wireless remote monitoring control device | |
| CN200987212Y (en) | Self-power positioning and mod/demod system for wireless/audio communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190301 |