CN206461607U - A kind of digital intecommunication system and digital handset - Google Patents
A kind of digital intecommunication system and digital handset Download PDFInfo
- Publication number
- CN206461607U CN206461607U CN201720012269.0U CN201720012269U CN206461607U CN 206461607 U CN206461607 U CN 206461607U CN 201720012269 U CN201720012269 U CN 201720012269U CN 206461607 U CN206461607 U CN 206461607U
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- radio receiver
- mobile radio
- digital
- impedance
- 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.)
- Active
Links
Abstract
The utility model provides a kind of digital intecommunication system and digital handset, it includes the integrated talkback chip for possessing zero intermediate frequency digital communication functions, micro-control unit in integrated talkback chip is when intercom works, the output impedance of radio frequency mobile radio receiver transmitter unit is adjusted first, so that output impedance and the impedance matching of output loading of radio frequency mobile radio receiver transmitter unit, then the input impedance of radio frequency mobile radio receiver transmitter unit is adjusted, so that the input impedance and the impedance matching of signal source of radio frequency mobile radio receiver transmitter unit；Any frequency band signals transmitting-receiving can be thus realized, and all possesses efficient energy transmission, solve existing support wide-band reception can not realize the problem of low noise and efficient energy are transmitted to digital handset receiving front-end.
Description
Technical field
The utility model is related to digital intercom field, more particularly to a kind of digital intecommunication system and digital handset.
Background technology
In existing intercommunication field, impedance needs and the signal source and load of low-noise amplifier are carried out after impedance matching,
It can guarantee that digital handset receiving front-end realizes that minimal noise is matched, but in the prior art, digital handset is all to support
A kind of signal transmitting and receiving of frequency range, the impedance of its low-noise amplifier is already set as optimal impedance and can not adjusted.
Existing one-segment can not meet signal transmitting and receiving needs of the user to wide-band, therefore existing skill to digital handset
Art provide support wide-band transmitting-receiving to digital handset, for this support wide-band receive to digital handset, such as
What realizes low noise acoustic matching and the transmission of efficient energy, is technical problem urgently to be resolved hurrily.
Utility model content
The utility model provides a kind of digital intecommunication system and digital handset, is received with solving existing support wide-band
The problem of low noise and efficient energy are transmitted can not be realized to digital handset receiving front-end.
The utility model provides a kind of digital intecommunication system, including：Power supply and possesses zero intermediate frequency digital communication work(
The integrated talkback chip of energy, power supply is integrated talkback chip power supply；Integrated talkback chip includes micro-control unit and penetrated
Frequency mobile radio receiver transmitter unit, radio frequency mobile radio receiver transmitter unit connecting signal source and load；
Micro-control unit is used for the output impedance for adjusting radio frequency mobile radio receiver transmitter unit first so that radio frequency moves nothing
The output impedance of line electricity receiver transmitter unit and the impedance matching of load, then adjust radio frequency mobile radio receiver hair
Penetrate the input impedance of machine unit so that the input impedance of radio frequency mobile radio receiver transmitter unit and the impedance of signal source
Matching.
Further, radio frequency mobile radio receiver transmitter unit includes low-noise amplifier and resonator, low noise
Acoustic amplifier passes through resonator connecting signal source and load；Micro-control unit is used for adjustment resonator first and causes low noise amplification
The output impedance of device and the impedance matching of load, then adjust input impedance and signal source that resonator causes low-noise amplifier
Impedance matching.
Further, resonator includes input resistant matching network and output impedance matching networks；Low-noise amplifier leads to
Input resistant matching network connection signal source is crossed, is connected and loaded by output impedance matching networks, micro-control unit is used for first
Adjust output impedance matching networks so that low-noise amplifier and the impedance matching of load, then adjust input resistant matching net
Network so that the impedance matching of low-noise amplifier and signal source.
Further, integrated talkback chip power supply includes digital signal processing unit, and digital signal processing unit is used to adopt
Collect the reflected signal between radio frequency mobile radio receiver transmitter unit and signal source and load, and reflected signal is transmitted
To micro-control unit.
Further, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit and load
Between reflected signal S22, and reflected signal S22 is transmitted to micro-control unit, micro-control unit is used for according to reflected signal
S22 adjusts the output impedance of radio frequency mobile radio receiver transmitter unit so that radio frequency mobile radio receiver is launched
The output impedance of machine unit and the impedance matching of load.
Further, micro-control unit is used for the output impedance for adjusting radio frequency mobile radio receiver transmitter unit,
So that reflected signal S22 signal reflex intensity is not more than preset value.
Further, micro-control unit is used to by the way of finely tuning step by step or tabled look-up determine the mode of adjusted value, adjusts
The output impedance of whole radio frequency mobile radio receiver transmitter unit.
Further, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit and signal
Reflected signal S11 between source, and reflected signal S11 is transmitted to micro-control unit, micro-control unit is used to be believed according to reflection
Number S11 adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that radio frequency mobile radio receiver is sent out
Penetrate the input impedance of machine unit and the impedance matching of signal source.
Further, micro-control unit is used for the input impedance for adjusting radio frequency mobile radio receiver transmitter unit,
So that reflected signal S11 signal reflex intensity is not more than preset value.
Further, micro-control unit is used to by the way of finely tuning step by step or tabled look-up determine the mode of adjusted value, adjusts
The input impedance of whole radio frequency mobile radio receiver transmitter unit.
The utility model provides a kind of digital handset, and it includes the digital intecommunication system of the utility model offer.
The beneficial effects of the utility model：
The utility model provides a kind of new digital intecommunication system and digital handset, and it includes possessing zero intermediate frequency numeral
Micro-control unit in the integrated talkback chip of communication function, integrated talkback chip adjusts radio frequency first when intercom works
The output impedance of mobile radio receiver transmitter unit so that the output of radio frequency mobile radio receiver transmitter unit
The impedance matching of impedance and load, then adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of signal source；Any frequency can thus be realized
Segment signal is received and dispatched, and all possesses efficient energy transmission, solves being connect to digital handset for existing support wide-band transmitting-receiving
The problem of low noise and efficient energy are transmitted can not be realized by receiving front end.
Brief description of the drawings
The structural representation for the digital intecommunication system that Fig. 1 provides for the utility model first embodiment；
The structure for the radio frequency mobile radio receiver transmitter unit that Fig. 2 provides for the utility model first embodiment is shown
It is intended to；
The structure connection figure for the integrated talkback chip that Fig. 3 provides for the utility model second embodiment；
Fig. 4 is the circuit connection diagram for the integrated talkback chip that the utility model second embodiment is related to.
Embodiment
The further annotation explanation of output is now done to the utility model by way of embodiment combination accompanying drawing.
First embodiment：
The structural representation for the digital intecommunication system that Fig. 1 provides for the utility model first embodiment, as shown in Figure 1,
In the present embodiment, the digital intecommunication system that the utility model is provided includes：Power supply 11 and possesses zero intermediate frequency digital communication work(
The integrated talkback chip 12 of energy, power supply 11 is that integrated talkback chip 12 is powered；Integrated talkback chip 12 includes microcontroller list
Member 121 and radio frequency mobile radio receiver transmitter unit 122, radio frequency mobile radio receiver transmitter unit 122
Connecting signal source 2 and load 3；Micro-control unit 121 is used for adjustment radio frequency mobile radio receiver transmitter unit 122 first
Output impedance so that the output impedance of radio frequency mobile radio receiver transmitter unit 122 and the impedance matching of load 3,
Then the input impedance of adjustment radio frequency mobile radio receiver transmitter unit 122 so that radio frequency mobile radio receiver
The input impedance of transmitter unit 122 and the impedance matching of signal source 2.In actual applications, the application is for radio frequency movement
What the LNA modules of radio receiver transmitter unit were improved, LNA modules connection antenna and demodulation module, mainly by day
The small-signal amplification that line is received；Micro-control unit is used for input and the output impedance for adjusting LNA modules, makes up to minimum
Noise matching.
As shown in Fig. 2 in certain embodiments, the radio frequency mobile radio receiver transmitter unit in above-described embodiment
122, specifically include low-noise amplifier 21 and resonator 22 for LNA modules, low-noise amplifier 21 is connected by resonator 22
Connect signal source and load；Micro-control unit 121 is used for the output impedance that adjustment resonator 22 first causes low-noise amplifier 21
With the impedance matching of load 3, then adjust resonator 22 and cause the input impedance of low-noise amplifier 21 and the impedance of signal source 2
Matching.
As shown in Fig. 2 in certain embodiments, the resonator in above-described embodiment includes input resistant matching network 221
And output impedance matching networks 222；Low-noise amplifier 21 is by the connecting signal source 2 of input resistant matching network 221, by defeated
Go out the connection of impedance matching network 222 load 3, micro-control unit 121 is used to adjust output impedance matching networks 222 first so that
Low-noise amplifier 21 and the impedance matching of load 3, then adjust input resistant matching network 221 so that low-noise amplifier
21 with the impedance matching of signal source 2.
As shown in figure 3, in certain embodiments, the integrated talkback chip power supply in above-described embodiment is included at data signal
Unit is managed, digital signal processing unit is used to gather radio frequency mobile radio receiver transmitter unit and signal source and loads it
Between reflected signal, and reflected signal is transmitted to micro-control unit.
In certain embodiments, the digital signal processing unit in above-described embodiment connects for gathering radio frequency mobile radio
Reflected signal S22 between receipts machine transmitter unit and load, and reflected signal S22 is transmitted to micro-control unit, microcontroller
Unit is used for the output impedance that radio frequency mobile radio receiver transmitter unit is adjusted according to reflected signal S22 so that radio frequency
The output impedance of mobile radio receiver transmitter unit and the impedance matching of load.
In certain embodiments, the micro-control unit in above-described embodiment is used to adjust radio frequency mobile radio receiver hair
Penetrate the output impedance of machine unit so that reflected signal S22 signal reflex intensity is not more than preset value.
In certain embodiments, the micro-control unit in above-described embodiment is used for by the way of finely tuning step by step or looked into
Table determines the mode of adjusted value, adjusts the output impedance of radio frequency mobile radio receiver transmitter unit.
In certain embodiments, the digital signal processing unit in above-described embodiment connects for gathering radio frequency mobile radio
Reflected signal S11 between receipts machine transmitter unit and signal source, and reflected signal S11 is transmitted to micro-control unit, micro-control
Unit processed is used for the input impedance that radio frequency mobile radio receiver transmitter unit is adjusted according to reflected signal S11 so that penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of signal source.
In certain embodiments, the micro-control unit in above-described embodiment is used to adjust radio frequency mobile radio receiver hair
Penetrate the input impedance of machine unit so that reflected signal S11 signal reflex intensity is not more than preset value.
In certain embodiments, the micro-control unit in above-described embodiment is used for by the way of finely tuning step by step or looked into
Table determines the mode of adjusted value, adjusts the input impedance of radio frequency mobile radio receiver transmitter unit.
Corresponding, the utility model provides a kind of digital handset, and it includes the digital intercom of the utility model offer
System.
A kind of new digital intecommunication system and digital handset are present embodiments provided, it is logical that it includes possessing zero intermediate frequency numeral
Micro-control unit in the integrated talkback chip of telecommunication function, integrated talkback chip adjusts radio frequency when intercom works, first and moved
The output impedance of dynamic radio receiver transmitter unit so that the output resistance of radio frequency mobile radio receiver transmitter unit
The anti-impedance matching with load, then adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that radio frequency
The input impedance of mobile radio receiver transmitter unit and the impedance matching of signal source；Any frequency range can thus be realized
Signal transmitting and receiving, and all possess efficient energy transmission, solve being received to digital handset for existing support wide-band transmitting-receiving
Front end can not realize the problem of low noise and efficient energy are transmitted.
Further annotation explanation is done to the utility model in conjunction with concrete application scene.
Second embodiment：
The present embodiment also provides a kind of integrated talkback chip for possessing zero intermediate frequency digital communication functions, including：Numeral letter
Number processing unit, voice signal codec unit, sound output amplifier unit, microphone amplifying circuit unit, Wei Chu
Manage device unit, PMU, memory cell, radio frequency mobile radio receiver transmitter unit and communication data
Interface；Radio frequency mobile radio receiver transmitter unit is used to use low pressure broadband voltage controlled technical finesse data, audio output
Power Amplifier Unit is used for exports audio signal；Microphone amplifying circuit unit is used to receive audio signal；Communication data connects
Mouth receives and dispatches the data signal of at least one type based on bus marco rule, and transmits to microprocessor unit；Microprocessor list
Member is used for the work for controlling each device in integrated talkback chip；PMU is used to external voltage being converted to other chips
Internals required voltage；Digital signal processing unit, voice signal codec unit, sound output amplifier list
Member, microphone amplifying circuit unit, microprocessor unit, PMU, memory cell, radio frequency mobile radio reception
Machine transmitter unit and communication data interface are integrated on one chip by system level chip technology.
Wherein, communication data interface connects including CAM interfaces, LCD interfaces, KPD interfaces, I2C interfaces, SPI interface, UART
At least one of mouth, USB2.0 interfaces, LED drive interface, PWM interfaces, SD/MMC interfaces, GPIO interface, I2S interfaces.
In certain embodiments, the integrated talkback chip in above-described embodiment also includes FM fm broadcast receiver units,
FM fm broadcast receivers unit is used to receive FM fm broadcast signals；FM fm broadcast receiver units pass through system level chip
Technology is integrated in integrated talkback chip.
In certain embodiments, the integrated talkback chip in above-described embodiment also includes bluetooth radio receiver/transmitter list
Member, bluetooth radio receiver/transmitter unit is used for bluetooth；Bluetooth radio receiver/transmitter unit passes through system
Level chip technology Integration ofTechnology is in integrated talkback chip.
Specifically, as shown in figure 3, the integrated talkback chip for possessing zero intermediate frequency digital communication functions that the present embodiment is provided
SOC (system level chip) includes：Digital Signal Processing DSP unit 31,16 voice signal codec units 32, audio output work(
Rate amplifier unit 33, microphone amplifying circuit unit 34,32 reduced instruction microprocessor units 35, power management PMU are mono-
Member 36,16MB PSRAM memory cells 37,16MB FLASH memories unit 38 and the transmitting of radio frequency mobile radio receiver
Machine unit 39, and some unshowned data-interfaces etc.；Wherein, 16MB PSRAM memory cells 37 and 16MB FLASH are deposited
Storage unit 38 can exist simultaneously, can also only exist one；Radio frequency mobile radio receiver transmitter unit 39 is used for
Using the voltage-controlled technical finesse data of low pressure (2.4V) wideband (100-500MHz, 700-1000MHz), power management (PMU) unit
36 voltages (3.2-4.2V, generally 3.7V) for providing the external world are converted to 1.4V and 2.4V voltages, and wherein 1.4V voltages supply number
Word signal transacting (DSP) unit 31,6MB PSRAM memory cells 37,16MB FLASH memories unit 38 are used, 2.4V electricity
Pressure is used for other units.
The circuit for the digital handset that the present embodiment is related to is as shown in figure 4, it includes：DSP unit 31, microprocessor unit
35th, in receiver transmitter unit 39 LNA (low noise amplifier modules, low noise amplifier module), the module
It is main to undertake front end amplification and frequency-selecting function, it has been internally integrated tuner (input load matching network and the load controlled by CPU
Matching network) and high-frequency amplifier；
Its operation principle is as follows：
Step 1, LNA receive signal, determine signal frequency range S1.
In actual applications, digital handset receives the signal of what frequency range and set by user, and it is in digital handset
Chip internal has storage, and LNA can obtain signal frequency range S1 from CPU.
Step 2, microprocessor unit recall the corresponding proper fit values of S1 by the mode such as table look-up, and pass through subsequent step
Control LNA module output impedances reach this matching value, actually this be a coarse regulation process.
Step 3, microprocessor unit 35 read the default of the corresponding signal S22 reflected intensitys of frequency range S1 from memory cell
(first preset value is defined value TH1 according to the characteristic impedance of LNA networks, in the preset value, and it is minimum that LNA possesses signal noise
Effect), compare reflected signal strength D1 and preset value TH1 size.If reflected signal strength D1 is less than or equal to default
Value TH1, then representation signal noise minimum condition met, step 5 can be directly performed, to realize that signal noise is minimum
Under the conditions of transimission power it is maximum；If reflected signal strength D1 is more than preset value TH1, the minimum condition of representation signal noise is also
It is not reaching to, performs step 4 so that LNA and the impedance matching of load, reaches the minimum condition of signal noise.
In actual applications, 100M -1000M can be divided into n sections, every section commissioning goes out one when chip IC is designed
Individual proper fit value, learns after the frequency that user is set, system recalls corresponding matching value, and user can be near matching value
Make fine setting.
Step 4, microprocessor unit 35 by using the mode finely tuned step by step or table look-up determine adjusted value mode,
Adjust the output impedance of radio frequency mobile radio receiver transmitter unit so that reflected signal S22 signal reflex intensity is not
More than preset value.
Step 5, the sensed signal sources of DSP unit 31 are inputted to LNA input signal S11 reflected signal S12 reflection letter
Number intensity D2, is transmitted to microprocessor unit 35.
Step 6, microprocessor unit 35 read the default of the corresponding signal S12 reflected intensitys of frequency range S1 from memory cell
(second preset value is defined value TH2 according to the characteristic impedance of LNA networks, and in the preset value, LNA possesses optimal high efficiency
Energy laser propagation effect, its set-up mode is similar with the first preset value), compare reflected signal strength D2 and preset value TH2 size.
If the LNA transimission powers that reflected signal strength D2 is less than or equal under preset value TH2, representation signal noise minimal condition are most
Met greatly, the flow of Auto-matching impedance can be terminated, realize signal noise it is minimum under conditions of transimission power most
Greatly；If the LNA transimission powers maximum that reflected signal strength D2 is more than under preset value TH2, representation signal noise minimal condition is gone back
It is not reaching to, performs step 7 so that the impedance matching of LNA and signal source, reaches the LNA transmission under signal noise minimal condition
Power is maximum.
Step 7, microprocessor unit 35 by using the mode finely tuned step by step or table look-up determine adjusted value mode,
Adjust the input impedance of radio frequency mobile radio receiver transmitter unit so that reflected signal S12 signal reflex intensity is not
It is maximum to complete the LNA transimission powers under signal noise minimal condition more than preset value.
In summary, implemented by of the present utility model, at least there is following beneficial effect：
The utility model provides a kind of new digital intecommunication system and digital handset, and it includes possessing zero intermediate frequency numeral
Micro-control unit in the integrated talkback chip of communication function, integrated talkback chip adjusts radio frequency first when intercom works
The output impedance of mobile radio receiver transmitter unit so that the output of radio frequency mobile radio receiver transmitter unit
The impedance matching of impedance and load, then adjusts the input impedance of radio frequency mobile radio receiver transmitter unit so that penetrate
The input impedance of frequency mobile radio receiver transmitter unit and the impedance matching of signal source；Any frequency can thus be realized
Segment signal is received and dispatched, and all possesses efficient energy transmission, solves being connect to digital handset for existing support wide-band transmitting-receiving
The problem of low noise and efficient energy are transmitted can not be realized by receiving front end.
It the above is only embodiment of the present utility model, any formal limit not done to the utility model
System, every any simple modification, equivalent variations, combination made according to technical spirit of the present utility model to embodiment of above
Or modification, still fall within the protection domain of technical solutions of the utility model.
Claims (11)
1. a kind of digital intecommunication system, it is characterised in that including：Power supply and the collection for possessing zero intermediate frequency digital communication functions
Into intercommunication chip, the power supply is the integrated talkback chip power supply；The integrated talkback chip includes micro-control unit
And radio frequency mobile radio receiver transmitter unit, the radio frequency mobile radio receiver transmitter unit connection signal
Source and load；The micro-control unit is used for the output resistance for adjusting the radio frequency mobile radio receiver transmitter unit first
It is anti-so that the output impedance of the radio frequency mobile radio receiver transmitter unit and the impedance matching of the load, then
Adjust the input impedance of the radio frequency mobile radio receiver transmitter unit so that the radio frequency mobile radio receiver
The input impedance of transmitter unit and the impedance matching of the signal source.
2. digital intecommunication system as claimed in claim 1, it is characterised in that the radio frequency mobile radio receiver emitter
Unit includes low-noise amplifier and resonator, and the low-noise amplifier connects the signal source and negative by the resonator
Carry；The micro-control unit is used to adjust the resonator first so that the output impedance of the low-noise amplifier is born with described
The impedance matching of load, then adjusts the resonator so that the input impedance of the low-noise amplifier and the resistance of the signal source
Anti- matching.
3. digital intecommunication system as claimed in claim 2, it is characterised in that the resonator includes input resistant matching network
And output impedance matching networks；The low-noise amplifier is led to by signal source described in the input resistant matching network connection
Cross the output impedance matching networks and connect the load, the micro-control unit is used to adjust the output impedance matching first
Network so that the low-noise amplifier and the impedance matching of the load, then adjusts the input resistant matching network, makes
Obtain the low-noise amplifier and the impedance matching of the signal source.
4. the digital intecommunication system as described in any one of claims 1 to 3, it is characterised in that the integrated talkback chip power supply
Including digital signal processing unit, the digital signal processing unit is used to gather the radio frequency mobile radio receiver transmitting
Reflected signal between machine unit and the signal source and load, and reflected signal is transmitted to the micro-control unit.
5. digital intecommunication system as claimed in claim 4, it is characterised in that the digital signal processing unit is used to gather institute
State the reflected signal S22 between radio frequency mobile radio receiver transmitter unit and the load, and by the reflected signal
S22 is transmitted to the micro-control unit, and the micro-control unit is used to adjust the radio frequency movement according to the reflected signal S22
The output impedance of radio receiver transmitter unit so that the output of the radio frequency mobile radio receiver transmitter unit
The impedance matching of impedance and the load.
6. digital intecommunication system as claimed in claim 5, it is characterised in that the micro-control unit is used to adjust the radio frequency
The output impedance of mobile radio receiver transmitter unit so that the signal reflex intensity of the reflected signal S22 is not more than
Preset value.
7. digital intecommunication system as claimed in claim 6, it is characterised in that the micro-control unit is used to use finely tunes step by step
Mode or table look-up and determine the mode of adjusted value, adjust the output of the radio frequency mobile radio receiver transmitter unit
Impedance.
8. digital intecommunication system as claimed in claim 4, it is characterised in that the digital signal processing unit is used to gather institute
The reflected signal S11 between radio frequency mobile radio receiver transmitter unit and the signal source is stated, and the reflection is believed
Number S11 is transmitted to the micro-control unit, and the micro-control unit, which is used to adjusting the radio frequency according to the reflected signal S11, to be moved
The input impedance of dynamic radio receiver transmitter unit so that the radio frequency mobile radio receiver transmitter unit it is defeated
Enter the impedance matching of impedance and the signal source.
9. digital intecommunication system as claimed in claim 8, it is characterised in that the micro-control unit is used to adjust the radio frequency
The input impedance of mobile radio receiver transmitter unit so that the signal reflex intensity of the reflected signal S11 is not more than
Preset value.
10. digital intecommunication system as claimed in claim 9, it is characterised in that the micro-control unit is used for using micro- step by step
The mode of the mode of tune or determination adjusted value of tabling look-up, adjusts the defeated of the radio frequency mobile radio receiver transmitter unit
Enter impedance.
11. a kind of digital handset, it is characterised in that including the digital intecommunication system as described in any one of claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720012269.0U CN206461607U (en) | 2017-01-04 | 2017-01-04 | A kind of digital intecommunication system and digital handset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720012269.0U CN206461607U (en) | 2017-01-04 | 2017-01-04 | A kind of digital intecommunication system and digital handset |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206461607U true CN206461607U (en) | 2017-09-01 |
Family
ID=59695522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720012269.0U Active CN206461607U (en) | 2017-01-04 | 2017-01-04 | A kind of digital intecommunication system and digital handset |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206461607U (en) |
-
2017
- 2017-01-04 CN CN201720012269.0U patent/CN206461607U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8270921B2 (en) | Systems and methods for tuning an antenna for a frequency modulation transceiver | |
| US20070149146A1 (en) | Apparatus for automatically matching frequency of antenna in wireless terminal and method of using the same | |
| CN206461606U (en) | A kind of digital intercom chip and digital intercom equipment | |
| CN102664601A (en) | Self-adapting impedance matching module | |
| CN101945498B (en) | Communication device and signal processing method | |
| CN103546188A (en) | Wireless mobile terminal of self-tuning antenna and adjusting method of self-tuning antenna | |
| CN105676717A (en) | Volume adjustment circuit and electronic device employing same | |
| CN215990916U (en) | Noise reduction system and mobile device | |
| CN206461607U (en) | A kind of digital intecommunication system and digital handset | |
| CN202334505U (en) | Airborne ultra-short wave radio station | |
| CN106899321A (en) | A kind of digital intercom terminal and its impedance matching methods | |
| CN203734625U (en) | Communication signal compensator | |
| CN209250580U (en) | Power amplifier matching circuit and power amplifier | |
| CN101312352A (en) | Common control circuit for audio signal wire and frequency modulation antenna | |
| CN201117776Y (en) | Gain adjustable radio frequency attenuator | |
| CN206542400U (en) | A kind of digital handset | |
| CN202334512U (en) | Airborne ultra-short wave broadcasting station | |
| CN104579407A (en) | Wireless communication device | |
| CN205160479U (en) | Transmitting channel power amplification circuit of UHF frequency channel | |
| CN205081535U (en) | WIFI reinforcing cell -phone charger | |
| CN201188660Y (en) | Television embedded with wireless sound transmitting device | |
| CN202586884U (en) | Adaptive impedance matching module | |
| CN201774517U (en) | Intelligent high-sensitivity receiver circuit | |
| CN105306079A (en) | Wireless communication receiver and wireless communication method | |
| CN204377082U (en) | Controlled in wireless multi-media sound system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |