CN106849985A - GSM building speakerphones - Google Patents
GSM building speakerphones Download PDFInfo
- Publication number
- CN106849985A CN106849985A CN201710119549.6A CN201710119549A CN106849985A CN 106849985 A CN106849985 A CN 106849985A CN 201710119549 A CN201710119549 A CN 201710119549A CN 106849985 A CN106849985 A CN 106849985A
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- China
- Prior art keywords
- resistance
- operational amplifier
- electric capacity
- input
- gsm
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of GSM building speakerphones, including shell, it is provided with microprocessor, memory, MIM message input module, gsm module, antenna, camera, voice amplification circuit, guard for entrance gate, unlocking circuit, loudspeaker, microphone and power supply in the shell, memory connects with microprocessor, for storing floor room number and registration telephone number corresponding with respective storey room number；MIM message input module includes keyboard and touch-screen；Voice amplification circuit includes the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier, diode, slide rheostat, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity.Implement GSM building speakerphones of the invention, have the advantages that：The safety and reliability of circuit is higher.
Description
Technical field
The present invention relates to building talkback field, more particularly to a kind of GSM building speakerphones.
Background technology
Building talkback industry is a subbranch in security protection industry, mainly produces the building pair that community residential building is used
Say machine Related product.Current building talkback product is sent on wired network by the EBI or network interface on product
Call instruction and audio-video signal, so as to realize the building talkback of cell.It is distributed in the intercommunication product (bag of whole residential quarters
Include resident family's indoor unit, unit doorway machine, management center machine etc.) by routing network networking into a relatively bulky intercommunication system
System.Existing building speakerphone causes the safety and reliability of circuit relatively low due to lacking corresponding circuit protection function.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of safety of circuit
Property and reliability GSM building speakerphones higher.
The technical solution adopted for the present invention to solve the technical problems is：A kind of GSM building speakerphones are constructed, including it is outer
Shell, is provided with microprocessor, memory, MIM message input module, gsm module, antenna, camera, voice and amplifies electricity in the shell
Road, guard for entrance gate, unlocking circuit, loudspeaker, microphone and power supply, the memory is connected with the microprocessor, for depositing
Storage floor room number and registration telephone number corresponding with respective storey room number, the voice amplification circuit respectively with micro- place
Reason device, loudspeaker and microphone connection, described information input module be connected with the microprocessor, for the input floor room to be called
Number, the gsm module is connected with the microprocessor and antenna respectively, for transmitting control signal, the camera with it is described
Microprocessor connection, the image information for gathering visiting guest, the guard for entrance gate and unlocking circuit with the microprocessor
Device is connected, and the unlocking circuit is also connected with the guard for entrance gate, the power supply is connected with the microprocessor, for for
The GSM building speakerphones are powered；Described information input module includes keyboard and touch-screen；
The voice amplification circuit includes the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, the 4th
Operational amplifier, diode, slide rheostat, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
Six resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, first computing are put
One end of the input in the same direction of big device one end, one end of second resistance and the first electric capacity respectively with the first resistor is connected,
The other end of the first resistor connects the power supply, and the other end of the second resistance is grounded, first electric capacity
The other end connects the first signal input part, and the reverse input end of first operational amplifier is respectively with the one of the 4th resistance
One end of end and 3rd resistor connects, and the other end of the 4th resistance is by second capacity earth, first computing
The output end of amplifier is connected with one end of the 4th electric capacity and one end of the 8th resistance respectively, the 8th resistance it is another
End be connected with the other end of the 3rd resistor and the input in the same direction of the 3rd operational amplifier respectively, the 4th electric capacity it is another
One end is connected with the input in the same direction of second operational amplifier, the output end of second operational amplifier and two pole
The anode connection of pipe, the negative electrode of diode reverse input end respectively with second operational amplifier, the 3rd electric capacity
The input in the same direction connection of one end, one end of the 5th resistance and four-operational amplifier, the other end of the 3rd electric capacity and the
The other end of five resistance is grounded, and the reverse input end of the four-operational amplifier connects with the sliding end of the slide rheostat
Connect, the fixing end connection secondary signal input of the slide rheostat, another fixing end of the slide rheostat
Ground connection, the output end of the four-operational amplifier connects the first signal output part, the 3rd operational amplifier it is reverse defeated
Enter end to be connected with its output end, the output end of the 3rd operational amplifier is also connected with secondary signal output end, the 3rd fortune
The cathode voltage input for calculating amplifier is connected with one end of the 7th resistance and one end of the 6th resistance respectively, and the described 7th
The other end ground connection of resistance, the other end of the 6th resistance connects first signal output part.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the 9th resistance, the described 9th
One end of resistance is connected with the reverse input end of second operational amplifier, the other end and two pole of the 9th resistance
The negative electrode connection of pipe.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the 5th electric capacity, the described 5th
One end of electric capacity is connected with one end of the 3rd electric capacity, and the other end of the 5th electric capacity connects with one end of the 5th resistance
Connect.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the tenth resistance, the described tenth
One end of resistance is connected with the cathode voltage input of the 3rd operational amplifier, the other end of the tenth resistance with it is described
One end connection of the 7th resistance.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the 11st resistance, described the
The reverse input end of three operational amplifiers is connected by the 11st resistance with its output end.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the 12nd resistance, described the
One end of 12 resistance is connected with the other end of the 5th electric capacity, the other end and the 4th computing of the 12nd resistance
The input in the same direction connection of amplifier.
In GSM building speakerphones of the present invention, the voice amplification circuit also includes the 6th electric capacity, the described 6th
One end of electric capacity is connected with the other end of the tenth resistance, the other end of the 6th electric capacity and one end of the 7th resistance
Connection.
Implement GSM building speakerphones of the invention, have the advantages that：Due to being provided with microprocessor in shell, depositing
Reservoir, MIM message input module, gsm module, antenna, camera, voice amplification circuit, guard for entrance gate, unlocking circuit, loudspeaker, words
Cylinder and power supply, voice amplification circuit include the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, the
Four-operational amplifier, diode, slide rheostat, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, the 8th resistance are used for
Overcurrent protection is carried out, the 4th electric capacity is used to prevent the interference between the first operational amplifier and the second operational amplifier, so electric
The safety and reliability on road is higher.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is the structural representation in GSM building speakerphones one embodiment of the present invention；
Fig. 2 is the circuit theory diagrams of voice amplification circuit in the embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In GSM building speakerphones embodiment of the present invention, the structural representation of the GSM building speakerphones is as shown in Figure 1.Figure
In 1, the GSM building speakerphones include shell (not shown), microprocessor 1, memory 2, information are provided with the shell defeated
Enter module 3, gsm module 4, antenna 5, camera 6, voice amplification circuit 7, guard for entrance gate 8, unlocking circuit 9, loudspeaker 10, microphone
11 and power supply 12, wherein, memory 2 is connected with microprocessor 1, for store floor room number and with respective storey room number
Corresponding registration telephone number, voice amplification circuit 7 is connected with microprocessor 1, loudspeaker 10 and microphone 11 respectively, information input mould
Block 3 is connected with microprocessor 1, for being input into the floor room number to be called, the MIM message input module 3 includes keyboard and touch-screen
(not shown), that is to say, that the floor room number to be called can be input into by way of by lower keyboard, it is also possible to by touching
The mode for touching touch-screen is input into the floor room number to be called.
In the present embodiment, gsm module 4 is connected with microprocessor 1 and antenna 5 respectively, for transmitting information and instruction, image
First 6 are connected with microprocessor 1, the image information for gathering visiting guest, and guard for entrance gate 8 and unlocking circuit 9 are and microprocessor
Device 1 is connected, and unlocking circuit 9 is also connected with guard for entrance gate 8, and power supply 12 is connected with microprocessor 1, for being the GSM building
Intercom is powered.
In the present embodiment, visiting guest by MIM message input module 3 be input into the floor room number to be called and confirmation after, micro- place
Reason device 1 mediates the corresponding registration telephone number of respective storey room number from memory 2, and microprocessor 1 starts camera 6 to be shot
Visitor people, microprocessor 1 calls the registration telephone number by the sending signal of gsm module 4, while microprocessor 1 is by camera 6
The dynamic image of shooting is sent to registration telephone number, when registration telephone number is cell-phone number, then by hand by gsm module 4
Machine can show the information of the Real-time Collection of camera 6, when registration telephone number is landline telephone, then cannot show；Subsequent owner
With send control signal after visiting guest's voice call, gsm module 4 receives the control signal, and microprocessor 1 is by the control signal
The value of the unlocking signal specified with guard for entrance gate 8 after separating compares, and it is visitor that unlocking circuit 9 is controlled if complying fully with
People unlocks.
Fig. 2 is the circuit theory diagrams of voice amplification circuit in the present embodiment, and in Fig. 2, the voice amplification circuit 7 includes first
Operational amplifier IC1, the second operational amplifier IC2, the 3rd operational amplifier IC3, four-operational amplifier IC4, diode D,
Slide rheostat RP, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.
Wherein, the input in the same direction of the first operational amplifier IC1 one end respectively with first resistor R1, second resistance R2
One end connection of one end and the first electric capacity C1, the other end connection power supply VCC of first resistor R1, second resistance R2's is another
End ground connection, the other end of the first electric capacity C1 connects the first signal input part IN1, the reverse input end of the first operational amplifier IC1
It is connected with one end of the 4th resistance R4 and one end of 3rd resistor R3 respectively, the other end of the 4th resistance R4 passes through the second electric capacity C2
Ground connection, the output end of the first operational amplifier IC1 is connected with one end of the 4th electric capacity C4 and one end of the 8th resistance R8 respectively, the
The other end of eight resistance R8 is connected with the other end of 3rd resistor R3 and the input in the same direction of the 3rd operational amplifier IC3 respectively,
The other end of the 4th electric capacity C4 is connected with the input in the same direction of the second operational amplifier IC2, the output of the second operational amplifier IC2
End is connected with the anode of diode D.
The negative electrode of diode D reverse input end, one end of the 3rd electric capacity C3, respectively with the second operational amplifier IC2
The input in the same direction connection of one end and four-operational amplifier IC4 of five resistance R5, the other end of the 3rd electric capacity C3 and the 5th electricity
The other end for hindering R5 is grounded, and the reverse input end of four-operational amplifier IC4 is connected with the sliding end of slide rheostat RP, sliding
Another fixing end ground connection of one fixing end connection secondary signal the input IN2, slide rheostat RP of dynamic rheostat RP, the
The output end of four-operational amplifier IC4 connects the first signal output part IN1, the reverse input end of the 3rd operational amplifier IC3 with
Its output end is connected, and the output end of the 3rd operational amplifier IC3 is also connected with secondary signal output end IN2, the 3rd operational amplifier
The cathode voltage input of IC3 is connected with one end of the 7th resistance R7 and one end of the 6th resistance R6 respectively, the 7th resistance R7's
The other end is grounded, and the other end of the 6th resistance R6 connects the first signal output part OUT1.
8th resistance R8 is current-limiting resistance, is put for the input in the same direction to the second operational amplifier IC2 and the 3rd computing
Branch road between the in-phase input end of big device IC3 carries out overcurrent protection.4th electric capacity C4 is coupled capacitor, for preventing the first fortune
The interference between amplifier IC1 and the second operational amplifier IC2 is calculated, so the safety and reliability of circuit is higher.
In the present embodiment, the voice amplification circuit 7 also includes the 9th resistance R9, one end and second computing of the 9th resistance R9
The reverse input end connection of amplifier IC2, the other end of the 9th resistance R9 is connected with the negative electrode of diode D.9th resistance R9 is
Current-limiting resistance, overcurrent protection is carried out for the branch road between the reverse input end and its output end to the second operational amplifier IC2,
To further enhance the safety and reliability of circuit.
In the present embodiment, the voice amplification circuit 7 also includes the 5th electric capacity C5, one end and the 3rd electric capacity of the 5th electric capacity C5
One end connection of C3, the other end of the 5th electric capacity C5 is connected with one end of the 5th resistance R5.5th electric capacity C5 is coupled capacitor, is used
Interference between the second operational amplifier IC2 and four-operational amplifier IC4 is prevented, further to strengthen the safety of circuit
Property and reliability.
In the present embodiment, the voice amplification circuit 7 also includes the tenth resistance R10, one end of the tenth resistance R10 and the 3rd fortune
The cathode voltage input connection of amplifier IC3 is calculated, the other end of the tenth resistance R10 is connected with one end of the 7th resistance R7.The
Ten resistance R10 are current-limiting resistance, for being carried out to the branch road between the 3rd operational amplifier IC3 and four-operational amplifier IC4
Overcurrent protection.
In the present embodiment, the voice amplification circuit 7 also includes the 11st resistance R11, and the 3rd operational amplifier IC3's is reverse
Input is connected by the 11st resistance R11 with its output end.11st resistance R11 is current-limiting resistance, for the 3rd computing
Branch road between the reverse input end of amplifier IC3 and its output end carries out overcurrent protection.
In the present embodiment, the voice amplification circuit 7 also includes the 12nd resistance R12, one end of the 12nd resistance R12 and the
The other end connection of five electric capacity C5, the other end of the 12nd resistance R12 and the input in the same direction of four-operational amplifier IC4 connect
Connect.12nd resistance R12 be current-limiting resistance, for the input in the same direction to the 5th resistance R5 and four-operational amplifier IC4 it
Between branch road carry out overcurrent protection.
In the present embodiment, the voice amplification circuit 7 also includes the 6th electric capacity C6, one end and the tenth resistance of the 6th electric capacity C6
The other end connection of R10, the other end of the 6th electric capacity C6 is connected with one end of the 7th resistance R7.6th electric capacity C6 is coupling electricity
Hold, for preventing the interference between the 3rd operational amplifier IC3 and four-operational amplifier IC4.
In a word, in the present embodiment, because voice amplification circuit 7 is provided with current-limiting resistance and coupled capacitor, therefore circuit
Safety and reliability is higher.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (7)
1. a kind of GSM building speakerphones, it is characterised in that including shell, microprocessor, memory, letter are provided with the shell
Breath input module, gsm module, antenna, camera, voice amplification circuit, guard for entrance gate, unlocking circuit, loudspeaker, microphone and power supply
Power supply, the memory connects with the microprocessor, for storing floor room number and note corresponding with respective storey room number
Volume telephone number, the voice amplification circuit is connected with the microprocessor, loudspeaker and microphone respectively, described information input module
Be connected with the microprocessor, for be input into the floor room number to be called, the gsm module respectively with the microprocessor and day
Line connection, for transmitting control signal, the camera be connected with the microprocessor, the image letter for gathering visiting guest
Breath, the guard for entrance gate and unlocking circuit are connected with the microprocessor, and the unlocking circuit also connects with the guard for entrance gate
Connect, the power supply is connected with the microprocessor, for for the GSM building speakerphones are powered；Described information is defeated
Entering module includes keyboard and touch-screen；
The voice amplification circuit includes the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, the 4th computing
Amplifier, diode, slide rheostat, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, first operational amplifier
One end of input in the same direction one end, one end of second resistance and the first electric capacity respectively with the first resistor be connected, it is described
The other end of first resistor connects the power supply, the other end ground connection of the second resistance, first electric capacity it is another
The first signal input part of end connection, the reverse input end of first operational amplifier respectively with one end of the 4th resistance and
One end connection of 3rd resistor, the other end of the 4th resistance is by second capacity earth, first operation amplifier
The output end of device is connected with one end of the 4th electric capacity and one end of the 8th resistance respectively, the other end point of the 8th resistance
It is not connected with the other end of the 3rd resistor and the input in the same direction of the 3rd operational amplifier, the other end of the 4th electric capacity
Input in the same direction with second operational amplifier is connected, output end and the diode of second operational amplifier
Anode is connected, the negative electrode of diode reverse input end respectively with second operational amplifier, one end of the 3rd electric capacity,
The input in the same direction connection of one end and four-operational amplifier of the 5th resistance, the other end and the 5th resistance of the 3rd electric capacity
The other end be grounded, the reverse input end of the four-operational amplifier is connected with the sliding end of the slide rheostat, institute
The fixing end connection secondary signal input of slide rheostat is stated, another fixing end of the slide rheostat is grounded,
The output end of the four-operational amplifier connects the first signal output part, the reverse input end of the 3rd operational amplifier with
Its output end is connected, and the output end of the 3rd operational amplifier is also connected with secondary signal output end, the 3rd operation amplifier
The cathode voltage input of device is connected with one end of the 7th resistance and one end of the 6th resistance respectively, the 7th resistance
The other end is grounded, and the other end of the 6th resistance connects first signal output part.
2. GSM building speakerphones according to claim 1, it is characterised in that the voice amplification circuit also includes the 9th
Resistance, one end of the 9th resistance is connected with the reverse input end of second operational amplifier, the 9th resistance it is another
One end is connected with the negative electrode of the diode.
3. GSM building speakerphones according to claim 2, it is characterised in that the voice amplification circuit also includes the 5th
Electric capacity, one end of the 5th electric capacity is connected with one end of the 3rd electric capacity, the other end of the 5th electric capacity and described
One end connection of five resistance.
4. GSM building speakerphones according to claims 1 to 3 any one, it is characterised in that the voice amplification circuit
Also include the tenth resistance, one end of the tenth resistance is connected with the cathode voltage input of the 3rd operational amplifier, institute
The other end for stating the tenth resistance is connected with one end of the 7th resistance.
5. GSM building speakerphones according to claims 1 to 3 any one, it is characterised in that the voice amplification circuit
Also include the 11st resistance, the reverse input end of the 3rd operational amplifier is connected by the 11st resistance and its output end
Connect.
6. GSM building speakerphones according to claim 3, it is characterised in that the voice amplification circuit also includes the tenth
Two resistance, one end of the 12nd resistance is connected with the other end of the 5th electric capacity, the other end of the 12nd resistance
Input in the same direction with the four-operational amplifier is connected.
7. GSM building speakerphones according to claim 4, it is characterised in that the voice amplification circuit also includes the 6th
Electric capacity, one end of the 6th electric capacity is connected with the other end of the tenth resistance, the other end of the 6th electric capacity with it is described
One end connection of the 7th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710119549.6A CN106849985A (en) | 2017-03-02 | 2017-03-02 | GSM building speakerphones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710119549.6A CN106849985A (en) | 2017-03-02 | 2017-03-02 | GSM building speakerphones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106849985A true CN106849985A (en) | 2017-06-13 |
Family
ID=59138566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710119549.6A Pending CN106849985A (en) | 2017-03-02 | 2017-03-02 | GSM building speakerphones |
Country Status (1)
| Country | Link |
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| CN (1) | CN106849985A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487441A (en) * | 2010-12-06 | 2012-06-06 | 昆山金鑫新能源科技有限公司 | Wireless visual building intercommunication system |
| CN203788402U (en) * | 2014-01-20 | 2014-08-20 | 厦门尚享电子科技有限公司 | Building intercommunication and monitoring integrated entrance machine |
| CN204633760U (en) * | 2015-06-02 | 2015-09-09 | 郑学荣 | GSM building speakerphone |
-
2017
- 2017-03-02 CN CN201710119549.6A patent/CN106849985A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487441A (en) * | 2010-12-06 | 2012-06-06 | 昆山金鑫新能源科技有限公司 | Wireless visual building intercommunication system |
| CN203788402U (en) * | 2014-01-20 | 2014-08-20 | 厦门尚享电子科技有限公司 | Building intercommunication and monitoring integrated entrance machine |
| CN204633760U (en) * | 2015-06-02 | 2015-09-09 | 郑学荣 | GSM building speakerphone |
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| ZHAOJIAMIN: "语音激活的开关和放大器", 《HTTP://WWW.DZSC.COM/DATA/CIRCUIT-45200.HTML》 * |
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Application publication date: 20170613 |
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