CN205912157U - A circuit for two -wire system visible dialogue system's video signal transmits - Google Patents

A circuit for two -wire system visible dialogue system's video signal transmits Download PDF

Info

Publication number
CN205912157U
CN205912157U CN201620018807.2U CN201620018807U CN205912157U CN 205912157 U CN205912157 U CN 205912157U CN 201620018807 U CN201620018807 U CN 201620018807U CN 205912157 U CN205912157 U CN 205912157U
Authority
CN
China
Prior art keywords
video signal
circuit
diode
electric capacity
wire system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201620018807.2U
Other languages
Chinese (zh)
Inventor
朱湘军
彭永坚
黄培周
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGZHOU VIDEO-STAR ELECTRONICS CO LTD
Original Assignee
Guangzhou Gvs Intelligent Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangzhou Gvs Intelligent Technology Co Ltd filed Critical Guangzhou Gvs Intelligent Technology Co Ltd
Priority to CN201620018807.2U priority Critical patent/CN205912157U/en
Application granted granted Critical
Publication of CN205912157U publication Critical patent/CN205912157U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The utility model discloses a circuit for two -wire system visible dialogue system's video signal transmits can effectively balance and uneven switch processing video signal to improve video signal's interference immunity. The utility model provides a pair of a circuit for two -wire system visible dialogue system's video signal transmits, include: be used for first resistance R1 and first electric capacity C1 with the video signal coupling, video signal passes through first resistance R1 and first electric capacity C1 in order, first electric capacity C1's the other end and a common mode inductance T1 are connected.

Description

A kind of circuit of the video signal transmission for two-wire system visual talkback system
Technical field
This utility model is related to electronic circuit field, more particularly, to a kind of video letter for two-wire system visual talkback system Number transmission circuit.
Background technology
In two-wire system visual talkback system, typically adopt transformer-coupled method.Doorway machine is by regarding through ovennodulation Frequency signal passes through transformer coupled being loaded on two-wire bus;Indoor set passes through transformer coupled taking-up from two-wire bus Video signal through ovennodulation.
By transformer coupled method although impedance matching and master secondary isolation can preferably be realized, but in bus Video signal be unbalanced signal it is impossible to eliminate the interference in signal bus transmitting procedure, need machine indoors to increase filtering Device is filtered to video signal;And transformer-coupled frequency bandwidth is narrow.
It would therefore be highly desirable to provide a kind of video signal transmission circuit that can effectively improve anti-interference.
Utility model content
This utility model provides a kind of circuit of the video signal transmission for two-wire system visual talkback system, Neng Gouyou Effect is balanced to video signal and uneven conversion process, thus improve video signal anti-interference.
A kind of circuit of video signal transmission for two-wire system visual talkback system that this utility model provides, comprising:
For first resistor r1 that couples video signal and the first electric capacity c1, video signal is sequentially through first resistor r1 With the first electric capacity c1;
The other end of the first electric capacity c1 is connected with the first common mode inductance t1.
Optionally,
It is connected the first bridge heap d1 between first electric capacity c1 and the first common mode inductance t1;
First bridge heap d1 ground connection.
Optionally,
First bridge four diodes of heap d1 bag, the respectively first diode, the second diode, the 3rd diode and the four or two Pole pipe.
Optionally,
The negative electrode of the first diode is connected with the negative electrode of the second diode, the negative electrode of the 3rd diode and the second diode Anode connects, and the anode of the 4th diode is connected with the anode of the 3rd diode, the negative electrode of the 4th diode and the first diode Anode connect.
Optionally,
This circuit also includes the first inductance l1, and inductance l1 is in parallel with first resistor r1 and the first electric capacity c1.
Optionally,
First inductance l1 is connected with the second electric capacity c2, the other end ground connection of the second electric capacity c2.
This utility model additionally provides a kind of doorway machine for two-wire system visual talkback system, installs any of the above-described institute State the circuit of the video signal transmission for two-wire system visual talkback system;
This circuit is electrically connected with power input 11, speaker and mike 12 and photographic head 13 respectively.
This utility model additionally provides a kind of indoor set for two-wire system visual talkback system, installs any of the above-described institute State the circuit of the video signal transmission for two-wire system visual talkback system;
This circuit is electrically connected with power output end 21, speaker and mike 22 and display 23 respectively.
This utility model additionally provides one kind and is used for two-wire system visual talkback system, comprising:
Doorway machine 10 and indoor set 20;
Described doorway machine 10 and indoor set 20 all include:
The above-mentioned video signal transmission circuit for two-wire system visual talkback system;
For doorway machine 10 video signal transmission circuit respectively with power input 11, speaker and mike 12 and Photographic head 13 is electrically connected with;
For indoor set 20 video signal transmission circuit respectively with power output end 21, speaker and mike 22 and Display 23 is electrically connected with;
Doorway machine 10 is connected by bus 30 with indoor set 20.
Optionally,
Described bus 30 has two.
As can be seen from the above technical solutions, this utility model embodiment has the advantage that
Transmission of video circuit in this utility model includes the resistance and the first electric capacity for coupling video signal, video Signal is sequentially through this resistance and the first electric capacity;The other end of the first electric capacity and a common mode inductance connection.
Wherein common mode inductance constitutes balun transformator, video signal is balanced-uneven conversion, so that video signal is existed It is balanced signal on two-wire bus, the anti-interference of enhancing signal.
Brief description
Fig. 1 is a kind of circuit of the video signal transmission for two-wire system visual talkback system in this utility model embodiment Embodiment electrical block diagram;
Fig. 2 is a kind of balun transformer circuit structural representation in this utility model;
Fig. 3 is the equivalent common-mode signal electrical block diagram in Fig. 2;
Fig. 4 is that in this utility model, one kind is used for two-wire system visual talkback circuit system structural representation.
Specific embodiment
This utility model provides a kind of circuit of the video signal transmission for two-wire system visual talkback system, Neng Gouyou Effect is balanced to video signal and uneven conversion process, thus improve video signal anti-interference.
Refer to Fig. 1, a kind of video signal transmission for two-wire system visual talkback system in this utility model embodiment Circuit embodiments, comprising:
For first resistor r1 that couples video signal and the first electric capacity c1, video signal is sequentially through first resistor r1 With the first electric capacity c1;
The other end of the first electric capacity c1 is connected with the first common mode inductance t1.
Wherein common mode inductance constitutes balun transformator, video signal is balanced-uneven conversion, so that video signal is existed It is balanced signal on two-wire bus, the anti-interference of enhancing signal.
Refer to Fig. 2 to Fig. 4,
When balun transformator is output as uneven video signal ui, ui can be equivalent to common-mode signal ucom and difference Signal udif is superimposed for mould.
Fig. 2 is the equivalent circuit diagram of the response to difference mode signal udif for the balun transformator.Due to i1=i2, l1=l2=m, Obtained by Kirchhoff's law:
U1=udif/2-jwl1i1+jwmi2-rc1i1=udif/2-rc1i1; (1-1)
U2=-udif/2+jwl2i2-jwml1+rc2i2=-udif/2+rc2i2; (1-2)
Because rc1, rc2 are much smaller than load rl, rc1, rc2 are negligible, are obtained by formula (1-1), formula (1-2): u1 =udif/2, (1-3)
U2=-udif/2. (1-4)
Fig. 3 is the equivalent circuit of the response to common-mode signal ucom for the balun transformator.Because rc1 be much smaller than rl, and rc1 with Rl connects, so rc1 is negligible;Obtained by Kirchhoff's law:
Ucom=jwl1i3+jwmi4+i3rl/2; (1-5)
Ucom=jwl2i4+jwmi3+i4rl/2; (1-6)
Because l1=l2=m, rc1=rc2 < < rl, is obtained by formula (1-5), formula (1-6):
U3/ucom=1/ (4jwl1/rl+1); (1-7)
U4/ucom=1/ (4jwl1/rl+1); (1-8)
So, when the inductance l of balun transformator meets l > > rl/4w when, the common-mode signal of outfan is close to zero, for The difference mode signal of outfan is negligible.So uneven video signal can be switched to balance video signal by balun transformator. Vice versa draws: balance video signal can be switched to uneven video signal by balun transformator.
In this utility model embodiment, a kind of circuit of video signal transmission for two-wire system visual talkback system is implemented Example further includes:
It is connected the first bridge heap d1 between first electric capacity c1 and the first common mode inductance t1;
First bridge heap d1 ground connection.
Bridge heap is a kind of electronic component, and inside is made up of multiple diodes.Main Function is rectification, adjusts the sense of current. There are following two beneficial effects with bridge heap rectification, one is convenient, through special arrangement mode so that incoming end segment polarity, I.e. without the concern for the problem of both positive and negative polarity;Two is that its performance of diode within bridge heap is close, and service behaviour is more stable.
This utility model four diodes of jackshaft heap bag, the respectively first diode, the second diode, the 3rd diode and 4th diode.
Wherein, the negative electrode of the first diode is connected with the negative electrode of the second diode, the negative electrode and the two or two of the 3rd diode The anode of pole pipe connects, and the anode of the 4th diode is connected with the anode of the 3rd diode, the negative electrode and first of the 4th diode The anode of diode connects.
In this utility model embodiment, a kind of circuit of video signal transmission for two-wire system visual talkback system is implemented Example further includes:
This circuit also includes the first inductance l1, and inductance l1 is in parallel with first resistor r1 and the first electric capacity c1.
In this utility model embodiment, a kind of circuit of video signal transmission for two-wire system visual talkback system is implemented Example further includes:
First inductance l1 is connected with the second electric capacity c2, the other end ground connection of the second electric capacity c2.
This utility model additionally provides a kind of doorway machine for two-wire system visual talkback system, installs any of the above-described institute State the circuit of the video signal transmission for two-wire system visual talkback system;
This circuit is electrically connected with power input 11, speaker and mike 12 and photographic head 13 respectively.
This utility model additionally provides a kind of indoor set for two-wire system visual talkback system, installs any of the above-described institute State the circuit of the video signal transmission for two-wire system visual talkback system;
This circuit is electrically connected with power output end 21, speaker and mike 22 and display 23 respectively.
This utility model additionally provides one kind and is used for two-wire system visual talkback system, comprising:
Doorway machine 10 and indoor set 20;
Described doorway machine 10 and indoor set 20 all include:
The above-mentioned video signal transmission circuit for two-wire system visual talkback system;
For doorway machine 10 video signal transmission circuit respectively with power input 11, speaker and mike 12 and Photographic head 13 is electrically connected with;
For indoor set 20 video signal transmission circuit respectively with power output end 21, speaker and mike 22 and Display 23 is electrically connected with;
Doorway machine 10 is connected by bus 30 with indoor set 20.
In this utility model embodiment, a kind of circuit of video signal transmission for two-wire system visual talkback system is implemented Example further includes:
Described bus 30 has two.
Refer to Fig. 2 below, be specifically described for two-wire system visual talkback system to above-mentioned:
Photographic head 13 obtains video signal, and this video signal sequentially passes through 3rd resistor r4 and the 5th electric capacity c5 is coupled to this In transmission of video circuit, video signal, after the second bridge heap d2 rectification, separates two branch roads, respectively from the 3 of the second bridge heap d2 Pin and the output of 4 pins, enter bus 30 after the second common mode inductance t2.
Wherein, also include the second inductance l2 being connected with power input 11, this second inductance l2 other end and the second bridge 1 pin of heap d2 connects.
This power input 11 is also connected with the 4th electric capacity c4, and the c4 other end is grounded.
3rd electric capacity c3 is in parallel with the 4th electric capacity c4, and the 3rd electric capacity c3 is connected with microphone and speaker 12.
Other end connection the 3rd common mode inductance t3 of bus 30, the other end of the 3rd common mode inductance t3 and the 3rd bridge heap d3's 3rd, 4 pins connect, 2 pin ground connection, and 1 pin is outfan.Wherein, first article of branch road flows through the 3rd inductance l3 and power output end 21 connections;Article 2 branch road, through the 6th electric capacity c6 and 3rd resistor r3, is finally connected with display screen 23.
Wherein, the 7th electric capacity c7 is in parallel with the 8th electric capacity c8, and the c7 other end is grounded.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description, Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
It should be understood that disclosed system in several embodiments provided herein, apparatus and method are permissible Realize by another way.For example, device embodiment described above is only schematically, for example, described unit Divide, only a kind of division of logic function, actual can have other dividing mode when realizing, for example multiple units or assembly Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not process.Another, shown or The coupling each other discussing or direct-coupling or communication connection can be by some interfaces, the indirect coupling of device or unit Close or communicate to connect, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.The mesh to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs 's.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of this utility model, Can be that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If described integrated unit is realized and as independent production marketing or use using in the form of SFU software functional unit When, can be stored in a computer read/write memory medium.Based on such understanding, the technical solution of the utility model is originally The part in other words prior art being contributed in matter or all or part of this technical scheme can be with software products Form embodies, and this computer software product is stored in a storage medium, including some instructions with so that one is counted Calculate described in machine equipment (can be personal computer, server, or network equipment etc.) execution each embodiment of this utility model The all or part of step of method.And aforesaid storage medium includes: u disk, portable hard drive, read only memory (rom, read- Only memory), random access memory (ram, random access memory), magnetic disc or CD etc. various permissible The medium of store program codes.
The above, above example only in order to the technical solution of the utility model to be described, is not intended to limit;Although ginseng According to previous embodiment, this utility model is described in detail, it will be understood by those within the art that: it is still Technical scheme described in foregoing embodiments can be modified, or wherein some technical characteristics are carried out with equivalent replacing Change;And these modifications or replacement, do not make the essence of appropriate technical solution depart from this utility model each embodiment technical scheme Spirit and scope.

Claims (10)

1. a kind of circuit of the video signal transmission for two-wire system visual talkback system is it is characterised in that include:
For the first resistor (r1) that couples video signal and the first electric capacity (c1), video signal is sequentially through the described first electricity Resistance (r1) and the first electric capacity (c1);
The other end of described first electric capacity (c1) is connected with the first common mode inductance (t1).
2. the circuit of the video signal transmission for two-wire system visual talkback system according to claim 1, its feature exists In,
It is connected the first bridge heap (d1) between described first electric capacity (c1) and described first common mode inductance (t1);
Described first bridge heap (d1) ground connection.
3. the circuit of the video signal transmission for two-wire system visual talkback system according to claim 2, its feature exists In,
Described first bridge heap (d1) wraps four diodes, the respectively first diode, the second diode, the 3rd diode and the 4th Diode.
4. the circuit of the video signal transmission for two-wire system visual talkback system according to claim 3, its feature exists In,
The negative electrode of described first diode is connected with the negative electrode of described second diode, the negative electrode of described 3rd diode with described The anode of the second diode connects, and the anode of described 4th diode is connected with the anode of described 3rd diode, and the described 4th The negative electrode of diode is connected with the anode of described first diode.
5. the circuit of the video signal transmission for two-wire system visual talkback system according to claim 1, its feature exists In,
Described circuit also includes the first inductance (l1), described inductance (l1) and described first resistor (r1) and the first electric capacity (c1) and Connection.
6. the circuit of the video signal transmission for two-wire system visual talkback system according to claim 5, its feature exists In,
Described first inductance (l1) is connected with the second electric capacity (c2), the other end ground connection of described second electric capacity (c2).
7. a kind of doorway machine for two-wire system visual talkback system is it is characterised in that install as arbitrary in claim 1 to 6 Circuit described in;
Described circuit is electrically connected with power input (11), speaker and mike (12) and photographic head (13) respectively.
8. a kind of indoor set for two-wire system visual talkback system is it is characterised in that install as arbitrary in claim 1 to 6 Circuit described in;
Described circuit is electrically connected with power output end (21), speaker and mike (22) and display (23) respectively.
9. one kind is used for two-wire system visual talkback system it is characterised in that including:
Doorway machine (10) and indoor set (20);
Described doorway machine (10) and indoor set (20) all include:
Circuit as any one of claim 1 to 6;
For doorway machine (10) described circuit respectively with power input (11), speaker and mike (12) and photographic head (13) it is electrically connected with;
For indoor set (20) described circuit respectively with power output end (21), speaker and mike (22) and display (23) it is electrically connected with;
Described doorway machine (10) is connected by bus (30) with indoor set (20).
10. according to claim 9 for two-wire system visual talkback system it is characterised in that
Described bus (30) has two.
CN201620018807.2U 2016-01-06 2016-01-06 A circuit for two -wire system visible dialogue system's video signal transmits Active CN205912157U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620018807.2U CN205912157U (en) 2016-01-06 2016-01-06 A circuit for two -wire system visible dialogue system's video signal transmits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620018807.2U CN205912157U (en) 2016-01-06 2016-01-06 A circuit for two -wire system visible dialogue system's video signal transmits

Publications (1)

Publication Number Publication Date
CN205912157U true CN205912157U (en) 2017-01-25

Family

ID=57814230

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620018807.2U Active CN205912157U (en) 2016-01-06 2016-01-06 A circuit for two -wire system visible dialogue system's video signal transmits

Country Status (1)

Country Link
CN (1) CN205912157U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105472295A (en) * 2016-01-06 2016-04-06 广州视声智能科技有限公司 Circuit for transmitting video signal of two-wire system video door phone system
CN110277619A (en) * 2019-06-18 2019-09-24 深圳振华富电子有限公司 Balun transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105472295A (en) * 2016-01-06 2016-04-06 广州视声智能科技有限公司 Circuit for transmitting video signal of two-wire system video door phone system
CN110277619A (en) * 2019-06-18 2019-09-24 深圳振华富电子有限公司 Balun transformer
CN110277619B (en) * 2019-06-18 2024-01-19 深圳振华富电子有限公司 Balun transformer

Similar Documents

Publication Publication Date Title
CN104702879B (en) A kind of rear end, the process circuit of front end and supply power coaxially circuit
CN102890666B (en) A kind of devices and methods therefor of shared interface, communication terminal
CN104506375B (en) Power wire broadband carrier communication network module test system
CN205912157U (en) A circuit for two -wire system visible dialogue system&#39;s video signal transmits
CN110247265A (en) Multifunctional data line, switching circuit and switching method
CN106406816A (en) An interface circuit used for firmware upgrade and an intelligent apparatus
CN207652308U (en) Control the circuit of business board on/off
CN104994040A (en) Ethernet switch and port multiplexing method applied to Ethernet switch
CN105282054A (en) Anti-interference rugged Ethernet switch
CN202940724U (en) Alternating current electromagnetic interference filter circuit
CN105471479A (en) CAN-bluetooth data transmission device used for industrial field
CN203574792U (en) Audio and video transmission circuit and audio and video transmission system as well as audio and video output equipment
CN208691268U (en) A kind of CAN communication modular circuit suitable for monitoring device
US9646757B2 (en) Surge protective network signal processing circuit assembly
CN204517788U (en) A kind of intelligent robot mechanical arm controller anti-jamming circuit
CN105472295A (en) Circuit for transmitting video signal of two-wire system video door phone system
CN209543326U (en) A kind of isolated form one drags four RS-485 hubs
CN207573251U (en) A kind of secondary power supply circuit for electromagnetic interference equipment
CN203086124U (en) USB 3.0 port static electricity discharge circuit and USB 3.0 port
CN206389349U (en) Anti- EMC signal conditioning circuit
CN205987142U (en) Novel remote VGA video signal transmission system
CN206790086U (en) Interface protection circuit and equipment interface
CN205793010U (en) Passive backplane structure for SDI high-definition video monitoring system
CN203708245U (en) Electric power carrier multiphase signal coupler used for civil air defense
CN203661089U (en) Coupling circuit of Ethernet PHY chip and optical module

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 510730 Guangdong province Guangzhou city four street bluejade Guangzhou economic and Technological Development Zone No. nine, No. 6 Building 601 room

Patentee after: Guangzhou visual sound intelligent technology Co.,Ltd.

Address before: 510730 Guangdong province Guangzhou city four street bluejade Guangzhou economic and Technological Development Zone No. nine, No. 6 Building 601 room

Patentee before: GUANGZHOU VIDEO-STAR ELECTRONICS Co.,Ltd.

CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 510730 Room 601, plant 6, No. 9, Lanyu 4th Street, Guangzhou Economic and Technological Development Zone, Guangzhou, Guangdong Province

Patentee after: GUANGZHOU VIDEO-STAR ELECTRONICS Co.,Ltd.

Address before: 510730 Room 601, plant 6, No. 9, Lanyu 4th Street, Guangzhou Economic and Technological Development Zone, Guangzhou, Guangdong Province

Patentee before: Guangzhou visual sound intelligent technology Co.,Ltd.

CP01 Change in the name or title of a patent holder