CN208768146U - A kind of door bell and button system - Google Patents
A kind of door bell and button system Download PDFInfo
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- CN208768146U CN208768146U CN201821347723.9U CN201821347723U CN208768146U CN 208768146 U CN208768146 U CN 208768146U CN 201821347723 U CN201821347723 U CN 201821347723U CN 208768146 U CN208768146 U CN 208768146U
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Abstract
The utility model discloses a kind of door bell and button system, including doorbell terminal, server and the first calling terminal, the second calling terminal, doorbell terminal, the first calling terminal, the second calling terminal are connect with server communication；Doorbell terminal includes trigger unit, if trigger unit is triggered, doorbell terminal sends call request to server, and server sends call instruction to the first calling terminal, with the intercommunication established between the first calling terminal and doorbell terminal according to call request；First calling terminal includes adapter unit, if adapter unit is triggered, then the first calling terminal sends transfer-request to server, and server sends reference order to the second calling terminal, with the intercommunication established between the second calling terminal and doorbell terminal according to transfer-request.If the first calling terminal user for responding call request first has found visitor's needs and another calling terminal user intercommunication, without hanging up intercommunication, and intercommunication directly can be forwarded to another calling terminal.
Description
Technical field
The utility model relates to doorbell technology more particularly to a kind of door bell and button systems.
Background technique
It is interacted between existing doorbell, usually doorway machine and indoor unit, occasionally there are nobody situation of interior, access
Person can not relate to owner.Although some doorbells can be called to associated mobile terminal, if some mobile terminal connects
Lead to the calling of doorbell, and not mobile terminal that visitor to be called, it is necessary to it hangs up, then presses doorbell again, and
And it cannot exclude the case where mobile terminal is again switched on calling.
Utility model content
For overcome the deficiencies in the prior art, it the purpose of this utility model is to provide a kind of door bell and button system, can solve
Some doorbells of existing doorbell can be called to associated mobile terminal, still, if some mobile terminal has connected doorbell
Calling, and not mobile terminal that visitor to be called, it is necessary to hang up, then press doorbell again, and cannot exclude
The problem of mobile terminal is again switched on calling.
The purpose of this utility model adopts the following technical scheme that realization:
A kind of door bell and button system, including doorbell terminal, server and the first calling terminal, the second calling terminal, the doorbell
Terminal, the first calling terminal, the second calling terminal are connect with the server communication；
The doorbell terminal includes trigger unit, if the trigger unit is triggered, the doorbell terminal sends calling
Request to the server, the server sends call instruction to first calling terminal, to establish according to call request
Intercommunication between first calling terminal and the doorbell terminal；
First calling terminal includes adapter unit, if the adapter unit is triggered, first calling terminal
Transfer-request is sent to the server, the server is whole to second calling according to transfer-request transmission reference order
End, with the intercommunication established between second calling terminal and the doorbell terminal.
Further, the doorbell terminal further includes first processor, the first communication unit and the first intercommunication unit, described
After first processor detects the trigger signal of the trigger unit, call request is sent to institute by first communication unit
State server；
First calling terminal includes the second communication unit, second processor and the second intercommunication unit, at described second
After reason device receives the call instruction that the server is sent by second communication unit, the second intercommunication unit is controlled
Intercommunication is established by the server and the first intercommunication unit.
Further, it if the second processor detects that the adapter unit is triggered, is communicated by described second
Unit sends transfer-request to the server.
Further, the server includes timing unit and controller, and the controller is examined according to the counting unit
It surveys the server and sends the time after reference order, after the server sends reference order preset duration, do not set up institute
State the intercommunication between the second calling terminal and the doorbell terminal, then keep first calling terminal and the doorbell terminal it
Between intercommunication.
Further, second calling terminal includes on-hook unit, and the second calling terminal is received from the server
After reference order, if the on-hook unit is triggered, second calling terminal sends on-hook and instructs to the server, institute
It states server and instructs the intercommunication kept between first calling terminal and the doorbell terminal according to on-hook.
Further, the first intercommunication unit, the second intercommunication unit include camera, microphone and loudspeaker.
Further, the doorbell terminal further includes power module, and the power module includes switch unit and remains single
Member, the switch unit include first into electric end, the first current output terminal and the first controlled end；Described first is used to connect electricity into electric end
Source, first current output terminal are connected to the first processor, and first controlled end is connected to the trigger unit and maintenance
Unit；
When the trigger unit is triggered, described first is set to connect into electric end and the first current output terminal by first controlled end
It is logical；The maintenance unit is also attached to the first processor, and the maintenance unit is used for the control according to the first processor
Connection of the system maintenance described first into electric end and the first current output terminal.
Further, the maintenance unit includes switching tube Q9, and the switching tube Q9 includes the second controlled end, second into electricity
End and the second current output terminal, described second is connected to first controlled end, the second current output terminal ground connection into electric end；Described second
Controlled end is connected to the first processor, and the first processor controls described second into electric end by second controlled end
With the second current output terminal on or off.
Further, the trigger unit includes button K2, and the trigger unit, which is triggered, specifically includes the button K2
It is pressed；The trigger unit further includes decomposing prevention circuit, and the decomposing prevention circuit is in parallel with the button K2, the trigger unit quilt
Triggering specifically further includes the decomposing prevention circuit movement.
Further, the decomposing prevention circuit includes spring-piece type switch KEY3 and resistance R525, the spring-piece type switch KEY3
It connects with the resistance R525, one end of the decomposing prevention circuit is connected to the button K2, other end ground connection；The doorbell terminal
When split, the spring-piece type switch KEY3 movement is connected to the both ends of the decomposing prevention circuit.
Compared with prior art, the beneficial effect of the utility model embodiment is: by server establish doorbell terminal and
Communication between multiple calling terminals, after the trigger unit of doorbell terminal is triggered, if responding the of call request first
One calling terminal user has found visitor's needs and another calling terminal user intercommunication, then passes through adapter unit and request to service
Device establishes the intercommunication of another calling terminal and doorbell terminal；During this, doorbell terminal is not necessarily to hang up intercommunication, and can be straight
It connects and intercommunication is forwarded to another calling terminal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of door bell and button system provided by the embodiment of the utility model；
Fig. 2 is the structural schematic diagram of the doorbell terminal in Fig. 1；
Fig. 3 is the circuit diagram of power module in Fig. 2；
Fig. 4 is the circuit diagram of the power module with decomposing prevention circuit.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
Such as the structural schematic diagram that Fig. 1 is a kind of door bell and button system.
As shown in Figure 1, door bell and button system includes doorbell terminal 100, server 200 and the calling of the first calling terminal 300, second
Terminal 400, doorbell terminal 100, the first calling terminal 300, the second calling terminal 400 are communicated to connect with server 200.
Wherein, doorbell terminal 100 includes trigger unit 110.If trigger unit 110 is triggered, doorbell terminal 100 is sent
Call request to server 200, server 200 sends call instruction to the first calling terminal 300, to establish according to call request
Intercommunication between first calling terminal 300 and doorbell terminal 100.
As preferred embodiment, the first calling terminal 300, the second calling terminal 400 can be mutually isostructural electronics
The terminals such as equipment, for example mobile phone, plate；And door bell and button system includes at least two calling terminals.If trigger unit 110 is touched
Hair, then doorbell terminal 100 sends call request to server 200, server 200 according to call request send call instruction to
Each calling terminal of the doorbell terminal 100 binding, the calling terminal of response call instruction first are the first calling terminal 300.
As preferred embodiment, doorbell terminal 100 further includes first processor 120, the first communication unit 130 and
One intercommunication unit 140.After first processor 120 detects the trigger signal of trigger unit 110, pass through the first communication unit 130
Call request is sent to server 200.
First calling terminal 300 includes the second communication unit 310, second processor 320 and the second intercommunication unit 330, the
After two processors 320 receive the call instruction of the transmission of server 200 by the second communication unit 310, the second intercommunication list is controlled
Member 330 establishes intercommunication by server 200 and the first intercommunication unit 140.
As preferred embodiment, the first intercommunication unit 140, the second intercommunication unit 330 include camera, display
Screen, microphone and loudspeaker (not shown).Second intercommunication unit 330 passes through server 200 and the foundation pair of the first intercommunication unit 140
It says, specifically, the voice messaging of the second intercommunication unit 330 acquisition and image information pass through the second communication by second processor 320
Unit 310 is sent to server 200, and the voice messaging and image information are transmitted to by server 200 through the first communication unit 130
The voice messaging is played by the loudspeaker of the first intercommunication unit 140, will be schemed by the first communication unit 130, the first communication unit 130
As information is shown in the display screen of the first intercommunication unit 140；And first intercommunication unit 140 acquire voice messaging and image letter
Breath is sent to server 200 by the first communication unit 130 by first processor 120, and server 200 is by the voice messaging and figure
As information is transmitted to the second communication unit 310 through the second communication unit 310, the second communication unit 310 passes through the voice messaging
The loudspeaker of second intercommunication unit 330 play, by image information display the second intercommunication unit 330 display screen.
In the present embodiment, the second intercommunication unit 330 is established intercommunication with the first intercommunication unit 140 by server 200 and is adopted
With mqtt (message queue telemetering transmission) protocol realization.Doorbell terminal 100 and the first calling terminal 300 establish the same mqtt frequency
Road carries out voice communication.
In the present embodiment, the first calling terminal 300 further includes adapter unit 340, adapter unit 340 include entity or
Virtual button.If adapter unit 340 is triggered, the first calling terminal 300 sends transfer-request, service to server 200
Device 200 sends reference order to the second calling terminal 400, to establish the second calling terminal 400 and doorbell end according to transfer-request
Intercommunication between end 100.In the present embodiment, the second calling terminal 400 is that the calling of the specified switching of the first calling terminal 300 is whole
End.
As preferred embodiment, if second processor 320 detects that adapter unit 340 is triggered, pass through second
Communication unit 310 sends transfer-request to server 200.
In the present embodiment, after the adapter unit 340 of the first calling terminal 300 is triggered, second processor 320 passes through
WebSocket sends transfer-request to server 200, and transfer-request includes the information of the second calling terminal 400.Server 200
Reference order is pushed to the second calling terminal 400 according to transfer-request, the second calling terminal 400 receives transfer-request, and according to
Transfer-request and doorbell terminal 100 subscribe to same mqtt channel, thus realize the second calling terminal 400 and doorbell terminal 100 it
Between intercommunication, achieve the effect that free relayed call terminal.
In another embodiment, it is established between the first calling terminal 300, the second calling terminal 400 and server 200
WebSocket long connection is realized by WebSocket long connection and is communicated, and achievees the effect that shift intercommunication.
As preferred embodiment, the second processor 320 of the first calling terminal 300 passes through the second communication unit 310
After sending transfer-request to server 200, first continue to keep the intercommunication between the first calling terminal 300 and doorbell terminal 100；Such as
Intercommunication between the second calling terminal of fruit 400 and doorbell terminal 100 successfully realizes that then server 200 passes through the second communication unit
310 feed back the information of successful handover to second processor 320, so that second processor 320 disconnects between doorbell terminal 100
Intercommunication.
As preferred embodiment, server 200 includes timing unit 210 and controller 220,220 basis of controller
Counting unit detection service device 200 sends the time after reference order, after server 200 sends reference order preset duration,
The intercommunication between the second calling terminal 400 and doorbell terminal 100 is not set up, then keeps the first calling terminal 300 and doorbell terminal
Intercommunication between 100.I.e. after server 200 sends reference order preset duration to the second calling terminal 400, if second exhales
It makes 400 hesitation network of terminal or other reasons not receive reference order, or does not timely respond to the call of reference order and ask
It asks, then the intercommunication between the second calling terminal 400 and doorbell terminal 100 is realized not successfully, then continues to keep the first calling terminal
Intercommunication between 300 and doorbell terminal 100, in order to the first calling terminal, 300 user further links up with visitor.
As preferred embodiment, the second calling terminal 400 includes on-hook unit 410, and on-hook unit 410 includes entity
Or virtual button.After second calling terminal 400 receives reference order from server 200, if on-hook unit 410 is touched
Hair, then the second calling terminal 400 sends on-hook and instructs to server 200, and server 200 keeps the first calling according to on-hook instruction
Intercommunication between terminal 300 and doorbell terminal 100.I.e. when 400 user of the second calling terminal is in the call for receiving reference order
After request, refuse the call request, then the intercommunication between the second calling terminal 400 and doorbell terminal 100 is realized not successfully, then after
The intercommunication between the first calling terminal 300 and doorbell terminal 100 is held in continuation of insurance, in order to 300 user of the first calling terminal and is visited
It is objective further to link up.
Door bell and button system provided by the embodiment of the utility model establishes doorbell terminal 100 and multiple callings by server 200
Communication between terminal, after the trigger unit 110 of doorbell terminal 100 is triggered, if responding the first of call request first
300 user of calling terminal has found visitor's needs and another calling terminal user intercommunication, then is requested by adapter unit 340
Server 200 establishes the intercommunication of another calling terminal and doorbell terminal 100；During this, doorbell terminal 100 is without hanging up pair
It says, and intercommunication directly can be forwarded to another calling terminal.
As the further improvement of the utility model embodiment, as shown in Figures 2 and 3, doorbell terminal 100 further includes power supply
10 modules 150, trigger unit 110 are connected to first processing units by 10 module 150 of power supply.
10 module 150 of power supply include switch unit 151 and maintenance unit 152, switch unit 151 include first into electric end,
First current output terminal and the first controlled end；First is used to connect power supply 10 into electric end.In the present embodiment, as shown in figure 3, switch is single
Member 151 include PMOS tube Q8, first into the source electrode that electric end, the first current output terminal and the first controlled end are respectively PMOS tube, drain electrode and
Grid.
In the present embodiment, power supply 10 is battery, and the level of power supply 10 is BAT_IN；First current output terminal is connected at first
Device 120 is managed, the level of the first current output terminal is BAT_VCC；First controlled end is connected to trigger unit 110 and maintenance unit 152.
When trigger unit 110 is not triggered, first into electric end and the first current output terminal be off-state, first processor
120 can not obtain electric energy from power supply 10.When trigger unit 110 is triggered, made by the first controlled end first into electric end and first
Current output terminal connection is started to work so that first processor 120 obtains electric energy from power supply 10.
As preferred embodiment, trigger unit 110 includes button K2, trigger unit 110 be triggered specifically include by
Button K2 is pressed.After button K2 is pressed, the first controlled end obtains trigger signal, so that first connects into electric end and the first current output terminal
It is logical.
As preferred embodiment, trigger unit 110 further includes resistance R48, and one end of resistance R48 is connect by button K2
Ground, the other end are connected to the first controlled end；Switch unit 151 includes being connected to first into the electricity between electric end and the first controlled end
Hinder R47.
When button K2 is not pressed, for the voltage of the first controlled end equal to first into the voltage at electric end, PMOS tube Q8 will not
Conducting, first into electric end and the first current output terminal is off-state, and first processor 120 can not obtain electric energy from power supply 10.When pressing
After button K2 is pressed, power supply 10 is grounded through resistance R47 and resistance R48, resistance R47, the junction resistance R48, i.e. the first controlled end
Voltage less than first into the voltage at electric end so that PMOS tube Q8 is connected, first be connected at this time into electric end with the first current output terminal, from
And first powers into the first processor 120 that the power supply 10 that electric end connects is connected to the first current output terminal, first processor 120 obtains
Start after power supply.
As preferred embodiment, switch unit 151 further includes being connected to first between electric end and the first controlled end
Capacitor C32.When button K2 is not pressed, the voltage of the first controlled end is equal to first into the voltage at electric end.Due to capacitor C32
The voltage at both ends cannot be mutated, when button K2 is just pressed moment, the voltage of the first controlled end be still equal to first into electric end electricity
Pressure；Only when the time long enough that button K2 is pressed, when so that capacitor C32 being discharged to a certain degree, can just make first into electricity
End is connected to the first current output terminal, therefore avoids door bell rings when button K2 is accidentally touched in short-term.
As preferred embodiment, trigger unit 110 further includes the diode being series between resistance R48 and button K2
D2, the anode of diode D2 are connected to resistance R48, and the cathode of diode D2 is connected to button K2；After guaranteeing that button K2 is pressed,
First controlled end can be with the variation of accurate judgement to voltage.
As preferred embodiment, the cathode of diode D2 is connected to power supply 10 by resistance R50；Convenient for being unclamped in K2
Afterwards and maintenance unit 152 is also in idle situation, it is ensured that the PMOS tube Q8 in switch unit 151 can be turned off accurately.
As preferred embodiment, power supply 10 is grounded by capacitor C33, is played a filtering role, to avoid the fluctuation of power supply 10
Generate malfunction.
Maintenance unit 152 is also attached to first processor 120, and maintenance unit 152 is used for the control according to first processor 120
Connection of the system maintenance first into electric end and the first current output terminal.
Trigger unit 110 is triggered so that first processor 120 is obtained for after electrically activating, the control of first processor 120 is tieed up
The connection of the maintenance of unit 152 first into electric end and the first current output terminal is held, to maintain power supply 10 to the confession of first processor 120
Electricity.The cutting of maintenance unit 152 first is controlled after first processor 120 has executed corresponding operation, then by first processor 120
Into the connection at electric end and the first current output terminal, so that first processor 120 thoroughly powers off, stop consumption electric energy.
As preferred embodiment, as shown in figure 3, maintenance unit 152 includes switching tube Q9, switching tube Q9 includes second
Controlled end, second are connected to the first controlled end, the second current output terminal ground connection into electric end into electric end and the second current output terminal, second；Second
Controlled end is connected to first processor 120 by pin MCU_GPIO, and first processor 120 passes through the second controlled end control second
Into electric end and the second current output terminal on or off.
As preferred embodiment, as shown in figure 4, trigger unit 110 further includes decomposing prevention circuit.Decomposing prevention circuit and button
K2 is in parallel, and it specifically further includes decomposing prevention circuit movement that trigger unit 110, which is triggered,.Spring-piece type switch KEY3 is located at doorbell terminal 100
The relevant position of shell, so that spring-piece type switch KEY3 is acted when the shell of doorbell terminal 100 is split.
As shown in figure 4, decomposing prevention circuit includes spring-piece type switch KEY3 and resistance R525, spring-piece type switch KEY3 and resistance
R525 series connection, one end of decomposing prevention circuit are connected to button K2, other end ground connection；When doorbell terminal 100 is split, spring-piece type switch
KEY3 movement is connected to the both ends of decomposing prevention circuit.
When doorbell terminal 100 is intact, the pin 1 and pin 3 of spring-piece type switch KEY3 is in an off state.When doorbell terminal
100 when being opened, and the switch shrapnel of spring-piece type switch KEY3 is released because product casing is dismantled, so that spring-piece type switch KEY3
Pin 1 and pin 3 be in connected state；To make the both ends of decomposing prevention circuit be connected to, i.e., trigger unit 110 is because of doorbell terminal
100 shell is split and is triggered.
Trigger unit 110 is triggered because the shell of doorbell terminal 100 is split, then doorbell terminal 100 sends call request
To server 200, server 200 sends call instruction to the first calling terminal 300, to establish the first calling according to call request
Intercommunication between terminal 300 and doorbell terminal 100；First calling terminal, 300 holder can pass through first pair of doorbell terminal 100
Say that unit 140 checks the event occurred before doorbell terminal 100.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (10)
1. a kind of door bell and button system, it is characterised in that: including doorbell terminal, server and the first calling terminal, the second calling terminal,
The doorbell terminal, the first calling terminal, the second calling terminal are connect with the server communication；
The doorbell terminal includes trigger unit, if the trigger unit is triggered, the doorbell terminal sends call request
To the server, the server sends call instruction to first calling terminal, described in establishing according to call request
Intercommunication between first calling terminal and the doorbell terminal；
First calling terminal includes adapter unit, if the adapter unit is triggered, first calling terminal is to institute
It states server and sends transfer-request, the server sends reference order to second calling terminal according to transfer-request, with
Establish the intercommunication between second calling terminal and the doorbell terminal.
2. door bell and button system as described in claim 1, it is characterised in that: the doorbell terminal further includes first processor, first
Communication unit and the first intercommunication unit, after the first processor detects the trigger signal of the trigger unit, by described
First communication unit sends call request to the server；
First calling terminal includes the second communication unit, second processor and the second intercommunication unit, the second processor
After receiving the call instruction that the server is sent by second communication unit, controls the second intercommunication unit and pass through
The server and the first intercommunication unit establish intercommunication.
3. door bell and button system as claimed in claim 2, it is characterised in that: if the second processor detects the adapter unit
It is triggered, then transfer-request is sent to the server by second communication unit.
4. door bell and button system as described in claim 1, it is characterised in that: the server includes timing unit and controller, institute
It states controller and the time after the server sends reference order is detected according to the counting unit, turn when the server is sent
After connecing instruction preset duration, the intercommunication between second calling terminal and the doorbell terminal is not set up, then keeps described the
Intercommunication between one calling terminal and the doorbell terminal.
5. door bell and button system as described in claim 1, it is characterised in that: second calling terminal includes on-hook unit, and second
After calling terminal receives reference order from the server, if the on-hook unit is triggered, second calling terminal
It sends on-hook to instruct to the server, the server keeps first calling terminal and the doorbell according to on-hook instruction
Intercommunication between terminal.
6. door bell and button system according to any one of claims 1 to 5, it is characterised in that: the first intercommunication unit, second pair
Say that unit includes camera, microphone and loudspeaker.
7. door bell and button system as claimed in claim 2, it is characterised in that: the doorbell terminal further includes power module, the electricity
Source module includes switch unit and maintenance unit, and the switch unit includes first controlled into electric end, the first current output terminal and first
End；Described first is used to connect power supply into electric end, and first current output terminal is connected to the first processor, and described first is controlled
End is connected to the trigger unit and maintenance unit；
When the trigger unit is triggered, described first is set to be connected into electric end with the first current output terminal by first controlled end；
The maintenance unit is also attached to the first processor, and the maintenance unit is used to be tieed up according to the control of the first processor
Hold described first into electric end and the first current output terminal connection.
8. door bell and button system as claimed in claim 7, it is characterised in that: the maintenance unit includes switching tube Q9, the switch
Pipe Q9 is connected to first controlled end into electric end into electric end and the second current output terminal, described second including the second controlled end, second,
The second current output terminal ground connection；Second controlled end is connected to the first processor, and the first processor passes through described
Second controlled end controls described second into electric end and the second current output terminal on or off.
9. door bell and button system as claimed in claim 8, it is characterised in that: the trigger unit includes button K2, and the triggering is single
Member, which is triggered, to be specifically included the button K2 and is pressed；The trigger unit further includes decomposing prevention circuit, the decomposing prevention circuit and institute
It is in parallel to state button K2, it specifically further includes the decomposing prevention circuit movement that the trigger unit, which is triggered,.
10. door bell and button system as claimed in claim 9, it is characterised in that: the decomposing prevention circuit include spring-piece type switch KEY3 and
Resistance R525, the spring-piece type switch KEY3 connect with the resistance R525, one end of the decomposing prevention circuit be connected to it is described by
Button K2, other end ground connection；When the doorbell terminal is split, the spring-piece type switch KEY3 movement makes the both ends of the decomposing prevention circuit
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821347723.9U CN208768146U (en) | 2018-08-21 | 2018-08-21 | A kind of door bell and button system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821347723.9U CN208768146U (en) | 2018-08-21 | 2018-08-21 | A kind of door bell and button system |
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| CN208768146U true CN208768146U (en) | 2019-04-19 |
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| CN201821347723.9U Active CN208768146U (en) | 2018-08-21 | 2018-08-21 | A kind of door bell and button system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794852A (en) * | 2021-10-28 | 2021-12-14 | 北京疯景科技有限公司 | Intercommunication system |
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2018
- 2018-08-21 CN CN201821347723.9U patent/CN208768146U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794852A (en) * | 2021-10-28 | 2021-12-14 | 北京疯景科技有限公司 | Intercommunication system |
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