CN207039588U - A kind of double mode intercom - Google Patents
A kind of double mode intercom Download PDFInfo
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- CN207039588U CN207039588U CN201720711698.7U CN201720711698U CN207039588U CN 207039588 U CN207039588 U CN 207039588U CN 201720711698 U CN201720711698 U CN 201720711698U CN 207039588 U CN207039588 U CN 207039588U
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Abstract
The utility model discloses a kind of double mode intercom, including FM reception, transmitter module, public network receives, transmitter module, receiver, loudspeaker and double mode controller, double mode controller has sound identification module, public network receiving module and public network transmitter module form public network intercommunication unit, public network intercommunication unit utilizes CDMA or WCDMA network formats transmission data, FM reception module and public network receiving module electrically connect with antenna respectively, the output end of FM reception module and the output end of public network receiving module are electrically connected the respective input of double mode controller, loudspeaker electrically connects the corresponding output end of double mode controller, receiver electrically connects the input of double mode controller.Compared with prior art, by frequency modulation intercommunication unit and public network intercommunication unit, double mode intercom is conversed by way of FM with frequency-modulation intercom for use or bimodulus intercom, can also be conversed by CDMA or WCDMA networks and public network intercom or double mode intercom.
Description
Technical field
Intercom is the utility model is related to, more specifically to a kind of double mode intercom.
Background technology
Frequency-modulation intercom for use is a kind of common intercom, and it is propagated in the air using frequency modulation (FM) signal, and is not borrowed
Help other networks.Frequency-modulation intercom for use, which has, to be conversed convenient, fast, is one kind of every profession and trade selection the advantages that without cost of the phone call
Communication tool, however, frequency-modulation intercom for use there may be interference phenomenon between each other influences communication, and frequency-modulation intercom for use can also be by
Speech quality deviation is caused to the influence of communication distance.
Public network intercom is to carry out wireless communication using the public CDMA or WCDMA network, and its difference with mobile phone exists
In：Public network intercom can be carried out calling in group, and all online users in group can be called, and public network intercom
Group in calling occupation mode it is with the occupation mode of traditional frequency-modulation intercom for use identical, while public network intercom is disturbed
Probability is very low, as long as and not limited by distance and can be carried out conversing in the place of CDMA or WCDMA networks.But public network
Intercom is limited by CDMA or WCDMA networks, and can produce cost of the phone call using public network intercom.It is also, existing
Public network intercom and frequency-modulation intercom for use, intercommunication can not be realized between the two.
In addition, the place that intercom uses mostly is the how noisy place of people, even if sometimes intercom is placed on by people
In one's ear be also not easily heard or easily mishear intercom broadcasting information.
Utility model content
The purpose of this utility model is to provide a kind of double mode intercom, and it can be carried out in the case of not by network
Intercommunication, also intercommunication can be carried out by CDMA or WCDMA networks, and can be led to frequency-modulation intercom for use or public network intercom
Letter.
To reach above-mentioned purpose, solution of the present utility model is：
A kind of double mode intercom, including the transmitting of FM reception module, public network receiving module, FM transmission module, public network
There is prioritizing selection module and voice to know for module, receiver and loudspeaker, and double mode controller, the double mode controller
Other module, wherein, the FM reception module and FM transmission module composition frequency modulation intercommunication unit, the public network receiving module and
Public network transmitter module forms public network intercommunication unit, and the public network intercommunication unit transmits data using CDMA or WCDMA network formats,
The FM reception module and the public network receiving module are electrically connected by wire with antenna respectively, the FM reception module
Output end and the output end of the public network receiving module correspond to the respective input of the electrical connection double mode controller, institute respectively
The corresponding output end that loudspeaker electrically connects the double mode controller is stated, the receiver electrically connects the double mode controller
The input of respective input, the input of the FM transmission module and the public network transmitter module electrically connects the double mode
The corresponding output end of controller；The prioritizing selection module is arranged to FM reception module prioritised transmission data or the public network connects
Module prioritised transmission data are received, and the sound identification module receives the FM reception module or the public network receiving module
The data of transmission are simultaneously converted into text；Also include housing, display screen is embedded with the housing and is provided with switch key, institute
The respective input that switch key electrically connects the double mode controller is stated, the double mode controller is cut according to the switch key
The data of receiver of changing commanders transmission are launched through the FM transmission module or launched through the public network transmitter module, the display screen
The corresponding output end of the double mode controller is electrically connected, the display screen is shown to the text.
The housing is provided with for the PTT1 keys under hopping pattern and for the PTT2 keys under public network mode.
The double mode controller also has selection judge module, and the selection judge module is according to institute in transmit state
State the strong and weak corresponding network formats of selection of movable signal of cdma network standard or WCDMA network formats.
Switching device is respectively equipped between the receiver and the FM transmission module and the public network transmitter module, institute
State and be respectively equipped with switch between the loudspeaker and the public network receiving module between loudspeaker and the FM reception module
Device.
The double mode controller also has emergent module, under the hopping pattern, the emergent module of launch party
There are multiple packets and buddy list with being established respectively in the emergent module of recipient, and each packet difference two of both sides
Two share same IP address, and each good friend in the buddy list of both sides corresponds to respectively shares same IP address two-by-two；Also,
The priority level for corresponding to each packet and buddy list, and the priority of the buddy list are provided with the emergent module
Not Gao Yu each packet rank；
In the public network mode, the double mode intercom passes through a management platform and other public network intercom or described
Double mode intercom realizes Push-to-Talk, and the management platform is provided with multiple packets and buddy list；In the management platform
The priority level corresponding to each packet and buddy list is provided with, and the priority level of the buddy list is described higher than each
The rank of packet.
The housing is provided with emergency key, and the emergency key electrically connects the respective input of the double mode controller.
The display screen is from top to bottom sequentially provided with the movable signal bar area of public network, the frequency zones of frequency modulation and signal strength bar
Area.
The double mode controller also has switches to hopping pattern or public network mode by the double mode intercom automatically
Mode switch module.
After said structure, the utility model has the advantages that：
(1), by frequency modulation intercommunication unit and public network intercommunication unit, enable double mode intercom by way of FM and tune
Frequency intercom or bimodulus intercom are conversed, also can be by CDMA or WCDMA networks and public network intercom or double mode intercommunication
Machine is conversed.Also, when the double mode intercom in frequency modulation talkback mode is because beyond speech range or by FM signal
When conversing unintelligible in the case of interference, double mode intercom can be switched to public network talkback mode by user, to reach smooth, clear
Converse clearly；Similarly, the double mode intercom signal in public network talkback mode it is bad or without signal in the case of, user
Double mode intercom can be switched to frequency modulation talkback mode.In addition, by sound identification module, double mode intercom will can connect
Receive audio and be converted into text, and shown in display screen, it is ensured that can still specify other side in a noisy environment
The content said.
(2), display screen is from top to bottom sequentially provided with the movable signal bar area of public network, the frequency zones of frequency modulation and signal strength bar
Area, user can intuitively check signal strength and the duration of call of the double mode intercom under corresponding modes.
(3), under public network mode, because double mode controller is according to the power choosing of CDMA or WCDMA network launches signals
Corresponding network formats are selected, and routinely, when movable signal is stronger the power attenuation of double mode intercom is fewer, therefore double mode pair
The machine of saying can select corresponding network formats according to the power of movable signal, relatively less with the communication of this being optimal, power consumption
Purpose.
(4), by module of meeting an urgent need, and each packet and the priority level of buddy list are provided with emergent module, and
Housing is provided with the emergent module key for corresponding to this emergent module, need to notify higher-level user (generally when running into emergency situation
Higher level) when, lower-level user directly can be confirmed by this module key of meeting an urgent need with high level user's communication without waiting for the user,
Stand-by period is reduced with this, notifies higher-level user (generally higher level) in time.
Brief description of the drawings
Fig. 1 is connection diagram of the present utility model.
Fig. 2 is display screen when state is waited in the utility model.
Fig. 3 is the display screen when transmitting working condition of frequency modulation intercommunication is in the utility model.
Fig. 4 is the display screen when reception working condition of frequency modulation intercommunication is in the utility model.
Fig. 5 is the display screen when transmitting working condition of public network intercommunication is in the utility model.
Fig. 6 is the display screen when reception working condition of public network intercommunication is in the utility model.
Embodiment
In order to which the technical solution of the utility model is explained further, the utility model is entered below by specific embodiment
Row elaborates.
A kind of double mode intercom, as shown in figure 1, including FM reception module, public network receiving module, FM transmission mould
Block, FM transmission module, receiver and loudspeaker, and double mode controller, this double mode controller have prioritizing selection mould
Block, sound identification module, selection judge module and emergent module, wherein, FM reception module and FM transmission module composition are adjusted
Frequency intercommunication unit, public network receiving module and public network transmitter module form public network intercommunication unit.
Frequency modulation intercommunication unit transmits data using FM mode, and public network intercommunication unit utilizes current CDMA or WCDMA nets
Network standard transmits data.
The input of above-mentioned FM reception module is electrically connected by wire with antenna one, above-mentioned public network receiving module
Input is electrically connected by wire with antenna two.Two strip antennas are used in the utility model, for ensureing that both of which is respective
The state of reception signal is all optimal.
The output end of FM reception module electrically connects the respective input of above-mentioned double mode controller, public network receiving module
Output end also electrically connect the respective input of two-mode field, loudspeaker electrically connects the corresponding output of the double mode controller
End.After FM reception module first receives the data of transmission, double mode controller plays out this data transfer to loudspeaker,
The data then transmitted are played after finishing again；Or public network receiving module is first received through CDMA or WCDMA networks
Standard transmission data after, double mode controller plays out this data transfer to loudspeaker, played again after finishing with
The data transmitted afterwards.
Above-mentioned prioritizing selection module is arranged to FM reception module prioritised transmission data or public network receiving module preferentially passes
After transmission of data, FM reception module and public network receiving module distinguish the respective data of same time reception, simultaneous transmission to bimodulus
In formula controller, the data transmitted under the priority level selection corresponding modes that now prioritizing selection module is set according to itself are leading
Play.To be set to FM reception module prioritised transmission data instance in prioritizing selection module, if FM reception module and public network connect
After receiving the respective data of the same time reception of module difference, the data of prioritizing selection module control FM reception module transfer are leading
Transmit to loudspeaker and play out, data transfer to the player of public network receiving module transmission is broadcast again after to be played
Put.
Preferably, double mode controller also has mode switch module, and prioritizing selection module is arranged to FM reception mould
Block prioritised transmission data, when first party is communicated under public network mode, if second party is wanted using hopping pattern and first party
When being communicated, after the FM reception module of first party receives the FM signal that second party is sent, prioritizing selection module judges
Go out FM signal it is preferential after, the mode switch module of first party will be switched off the communication of first party, and by the pattern switching of first party
To hopping pattern, first party will be communicated with second party using FM mode automatically.Conversely, when public network mode is prior to frequency modulation
During pattern, i.e., prioritizing selection module is arranged to public network receiving module prioritised transmission data, and mode switch module is according to above-mentioned progress
Corresponding adjustment.Prioritizing selection module can be automatically set to according to the communication pattern of higher-level user in the utility model
Corresponding pattern is preferential, such as the communication pattern of higher level user is hopping pattern, then the other user of lower level with it is more advanced
During other user's communication, the mode switch module in the double mode intercom of the other user of lower level is switched to hopping pattern, together
Sample, the communication pattern of higher level user is public network mode, then when the other user of lower level communicates with the user of higher level,
Mode switch module in the double mode intercom of the other user of lower level is switched to public network talkback mode.
Receiver electrically connects the respective input of double mode controller, input and public network the transmitting mould of FM transmission module
The input of block corresponds to electrically connected with the corresponding output end of double mode controller respectively.Meanwhile double mode intercom also includes shell
Body, this housing are provided with switch key, and this switch key electrically connects the respective input of double mode controller, manually presses switching
Key switches over, the pattern switched according to switch key, and the data of double mode controller control receiver transmission are through FM transmission mould
Block is launched in corresponding intercom or through public network transmitter module and launched to corresponding intercom.When user will be in hopping pattern
During lower call, switch key is pressed, double mode intercom is switched to hopping pattern, i.e. double mode controller control receiver transmission
Data launched by FM transmission module to corresponding intercom.Wherein, FM transmission module will be by using FM mode
In data transfer to the corresponding intercom for talking about device transmission, public network transmitter module will be by using CDMA or WCDMA network formats
Talk about in data transfer to the corresponding intercom that device transmission comes.
Also, display screen is embedded with front side of above-mentioned housing, display screen electrically connects the output end of double mode controller, uses
To show the data of sound identification module output.By taking hopping pattern as an example, when double mode intercom is under hopping pattern, frequency modulation
For receiving module by the data transfer of reception to double mode controller, sound identification module receives FM reception module transfer
After data, this voice data is converted into text by sound identification module, and is shown on a display screen, user is clearly conversed
Content, avoid mishearing or not hearing in a noisy environment the content of communication.
Preferably, it is equiped with conventional PTT1 keys and PTT2 keys on housing, the communication that this PTT1 key is used under hopping pattern,
The communication that PTT2 keys are used under public network mode.Wherein, this PTT1 key and PTT2 keys are existing common PTT keys.
Preferably, display screen shows the data of double mode controller output, and display screen is from top to bottom sequentially provided with public network
Movable signal bar area, the frequency zones of frequency modulation and signal strength bar area, make user to be intuitive to see the corresponding shape of double mode intercommunication
State.
As in Figure 2-4, if double mode intercom is in hopping pattern, i.e., public network mode is closed, and is pinned
After PTT1 keys, display screen shows the symbol " TX " of emission state in the left side of display frequency, and being at this moment directed at receiver can be carried out
Call；PTT1 keys are unclamped, bimodulus intercom machine enters stand-by state immediately, if now there is frequency modulation call signal, display screen is aobvious
Show that the left side of frequency shows the symbol " RX " of reception state, and loudspeaker plays the content of speaking of the opposing party, and in emitting shape
In state and reception state, display screen can all show the power of current transmitting or reception signal.As shown in Figure 2 and such as Fig. 5-6 institutes
Show, if double mode intercom is in public network mode, pin PTT2 keys, the lower section that movable signal bar is corresponded on display screen is shown
Calling and the air time, being at this moment directed at receiver can be conversed；PTT2 keys are unclamped, bimodulus intercom, which enters, waits for shape
State, if now there is public network call signal, the lower section display call on display screen corresponding to movable signal bar neutralizes the air time,
And loudspeaker plays the content of speaking of the opposing party, and in emission state and reception state, display screen can all show current
Movable signal is strong and weak.It is preferred that this display screen is LCD screen.
Further, conventional switching device one, receiver and public network are provided between receiver and FM transmission module
Conventional switching device two is provided between transmitter module, conventional switching device is provided between FM reception module and loudspeaker
Three, conventional switching device four is provided between public network receiving module and loudspeaker, to prevent user from triggering corresponding module, order is double
Pattern intercom continuous firing.
Under public network mode, double mode intercom by the selection judge module in double mode controller to CDMA or
Both network formats of WCDMA are selected, to select user's most strong network formats of movable signal under the present circumstances.Often
For rule, because the power attenuation of double mode intercom when movable signal is stronger is fewer, in other words, movable signal under emission state
Power can determine antenna two transmitting terminal driving voltage size, the i.e. transmitting terminal of the stronger antenna two of movable signal driving
Voltage is smaller.
When double mode intercom is under public network mode, double mode controller controls double mode intercom under cdma network
One signal is launched by antenna two, at this moment selects judge module to obtain the driving voltage one of transmitting terminal of antenna two；Double mode
Controller control double mode intercom launches another signal under WCDMA networks by antenna two, at this moment selects judge module to obtain
Take the driving voltage two of the transmitting terminal of antenna two；Also, select judge module by driving voltage one under both network formats,
Two size is contrasted, you can judge the network formats that movable signal is most strong under the present circumstances, it is optimal so as to switch to
Network formats under.Wherein, selection judge module has driving voltage determining module.
As another way, when double mode intercom is in public network mode, double mode controller control double mode intercommunication
Machine launches a signal under cdma network by antenna two, and double mode controller obtains the driving voltage one and defeated during emission state
Go out electric current one, and carry out the calculating of power consumption；Double mode controller control double mode intercom passes through antenna two under WCDMA networks
Launch another signal, at this moment double mode controller controls the driving voltage two and output current two when obtaining emission state, goes forward side by side
The calculating of row power consumption, judge module is then selected by being contrasted to the size of power attenuation under both network formats, you can
The network formats that movable signal is most strong under the present circumstances are judged, so as to switch under optimal network formats.Wherein, select
Judge module has driving voltage determining module, output current determining module and power consumption determining module, and this driving voltage determines mould
Block is used to determine driving voltage in emission state, and output current determining module is used to determine output current in emission state,
Power consumption determining module determines power during emission state according to the result of driving voltage determining module and output current determining module
Loss.
Double mode controller also has emergent module, under hopping pattern, the emergent module of launch party and answering for recipient
Being established respectively in anxious module has multiple packets (packet 1, packet 2 ... packet n), and the quantity of packet can be carried out according to actual conditions
Set, the packet 1 of sender shares same IP address, the packet 2 of sender and the packet of recipient with the packet 1 of recipient
2 share same IP address, the like.After such a mode, the user of sender can be to every in the packet of recipient
Individual user is called, and the user in whole recipient packet is called；Also, it is provided with each packet in emergent module
Priority level, when in low-level packets user call higher-level user when, need to the confirmation through higher-level user can just carry out
Call；And high level user can chip in the packet of low level by force.Meanwhile the emergent module of launch party and recipient
Emergent module in also establish buddy list respectively, in this buddy list can be set multiple good friends (good friend 1, good friend 2 ... are good
It is friendly that n) and the good friend 1 of the good friend 1 of sender and recipient share same IP address, the like；Also, set in emergent module
The priority level of each good friend is equipped with, and the priority level of buddy list is higher than the priority level of each packet, therefore usually good friend arranges
User can chip in each packet by force in table.
Under public network mode, user can be achieved to call with another user or one group of key of user one by management platform, this pipe
Multiple packets and buddy list are provided with platform, and each be grouped is provided with priority level, the good friend in buddy list also sets
Priority level is equipped with, the priority level of buddy list is higher than the priority level of each packet.
In addition, corresponding to this emergent module on above-mentioned housing is provided with emergency function key, i.e. emergency function key electrical connection bimodulus
The input of formula controller.Emergent user of the module in each component needs emergency notice higher-level user running into burst tense
When (user i.e. in buddy list), lower-level user can be directly true without waiting for the user with the user's communication in buddy list
Recognize, when unmanned response, lower-level user can press emergency function key, and lower-level user is by double mode controller according to preferential
The order of rank from high to low is conversed with next good friend in buddy list, if emergency function key is pressed in unmanned response again
Conversed with next bit good friend, until someone's response.For example, the good friend in each buddy list is typically the upper of each grouping user
Level, when running into emergency situation and need to notify higher level, the user in each packet be able to can be carried out without waiting for the confirmation of this good friend
Call.
In the utility model, double mode intercom is respectively provided with conventional intercom under hopping pattern or public network mode to be had
Function, such as scheduling, authority monitor, distant get killed, intrusion and tolls breakdown function.
Preferably, also there is bluetooth module in double mode controller, when Communication Jamming is serious under hopping pattern,
Public network mode lower network is when the signal is poor, user can realize communication by bluetooth mode.Wherein, housing is provided with bluetooth conversation key,
Bluetooth communication key electrically connects the respective input of double mode controller.
In the utility model, double mode controller can be achieved above-mentioned using controller conventional in electronic technology field
Function, above-mentioned module is integrated on same chip, the utility model is only to prioritizing selection mould by such as existing conventional MCU
Block, emergent module make suitably parameter modification, and this is the conventional way of electronic technology field.
It the foregoing is only the preferred embodiment of the present embodiment, all equalizations done with the utility model claims scope
Change and modification, all should belong to right of the present utility model.
Claims (8)
- A kind of 1. double mode intercom, it is characterised in that：Including FM reception module, public network receiving module, FM transmission module, Public network transmitter module, receiver and loudspeaker, and double mode controller, the double mode controller have prioritizing selection module And sound identification module, wherein, the FM reception module and FM transmission module composition frequency modulation intercommunication unit, the public network connect Receive module and public network transmitter module forms public network intercommunication unit, the public network intercommunication unit utilizes CDMA or WCDMA network formats Data are transmitted, the FM reception module and the public network receiving module are electrically connected by wire with antenna respectively, the frequency modulation The output end of receiving module and the output end of the public network receiving module correspond to the phase of the electrical connection double mode controller respectively Input is answered, the loudspeaker electrically connects the corresponding output end of the double mode controller, and the receiver electrical connection is described double The input of the respective input of mode controller, the input of the FM transmission module and the public network transmitter module is electrically connected Connect the corresponding output end of the double mode controller；The prioritizing selection module is arranged to FM reception module prioritised transmission data Or the public network receiving module prioritised transmission data, and the sound identification module receives the FM reception module or described The data of public network receiving module transmission are simultaneously converted into text；Also include housing, display screen is embedded with the housing and is set Be equipped with switch key, the switch key electrically connects the respective input of the double mode controller, the double mode controller according to The data that receiver transmits are launched or through the public network transmitter modules by the switching of the switch key through the FM transmission module Transmitting, the display screen electrically connect the corresponding output end of the double mode controller, and the display screen enters to the text Row display.
- A kind of 2. double mode intercom according to claim 1, it is characterised in that：The housing, which is provided with, is used for frequency modulation mould PTT1 keys under formula and for the PTT2 keys under public network mode.
- A kind of 3. double mode intercom according to claim 1, it is characterised in that：The double mode controller also has choosing Select judge module, the selection judge module is according to the cdma network standard in transmit state or WCDMA network formats Movable signal is strong and weak to select corresponding network formats.
- A kind of 4. double mode intercom according to claim 1, it is characterised in that：The receiver and the FM transmission Switching device is respectively equipped between module and the public network transmitter module, between the loudspeaker and the FM reception module and Switching device is respectively equipped between the loudspeaker and the public network receiving module.
- A kind of 5. double mode intercom according to claim 1, it is characterised in that：The double mode controller also has should Anxious module, under the hopping pattern, established respectively in the emergent module of launch party and the emergent module of recipient There are multiple packets and buddy list, and same IP address, the good friend of both sides are shared in each packet of both sides two-by-two respectively Each good friend in list corresponds to respectively shares same IP address two-by-two；Also, it is provided with the emergent module corresponding to each described Packet and the priority level of buddy list, and the priority level of the buddy list is higher than the rank of each packet；Under the public network mode, the double mode intercom passes through a management platform and other public network intercom or described double Pattern intercom realizes Push-to-Talk, and the management platform is provided with multiple packets and buddy list；Set in the management platform The priority level corresponding to each packet and buddy list is equipped with, and the priority level of the buddy list is higher than each described point The rank of group.
- A kind of 6. double mode intercom according to claim 5, it is characterised in that：The housing is provided with emergency key, institute State the respective input that emergency key electrically connects the double mode controller.
- A kind of 7. double mode intercom according to claim 1, it is characterised in that：The display screen is from top to bottom set successively There are the movable signal bar area of public network, the frequency zones of frequency modulation and signal strength bar area.
- A kind of 8. double mode intercom according to claim 1, it is characterised in that：The double mode controller also has certainly The dynamic mode switch module that the double mode intercom is switched to hopping pattern or public network mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720711698.7U CN207039588U (en) | 2017-06-19 | 2017-06-19 | A kind of double mode intercom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720711698.7U CN207039588U (en) | 2017-06-19 | 2017-06-19 | A kind of double mode intercom |
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| CN207039588U true CN207039588U (en) | 2018-02-23 |
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| CN201720711698.7U Expired - Fee Related CN207039588U (en) | 2017-06-19 | 2017-06-19 | A kind of double mode intercom |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147421A (en) * | 2017-06-19 | 2017-09-08 | 泉州欧讯电子有限公司 | A kind of double mode intercom |
| CN110572175A (en) * | 2019-09-29 | 2019-12-13 | 湖北美和易思教育科技有限公司 | Multifunctional interphone system |
-
2017
- 2017-06-19 CN CN201720711698.7U patent/CN207039588U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147421A (en) * | 2017-06-19 | 2017-09-08 | 泉州欧讯电子有限公司 | A kind of double mode intercom |
| CN107147421B (en) * | 2017-06-19 | 2024-03-19 | 泉州欧讯电子有限公司 | Dual-mode interphone |
| CN110572175A (en) * | 2019-09-29 | 2019-12-13 | 湖北美和易思教育科技有限公司 | Multifunctional interphone system |
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