CN105379262B - A kind of monitoring sound intermediate frequency signal transmitting apparatus - Google Patents
A kind of monitoring sound intermediate frequency signal transmitting apparatus Download PDFInfo
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- CN105379262B CN105379262B CN201480040692.0A CN201480040692A CN105379262B CN 105379262 B CN105379262 B CN 105379262B CN 201480040692 A CN201480040692 A CN 201480040692A CN 105379262 B CN105379262 B CN 105379262B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/25—Countermeasures against jamming based on characteristics of target signal or of transmission, e.g. using direct sequence spread spectrum or fast frequency hopping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/12—Jamming or countermeasure used for a particular application for acoustic communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Closed-Circuit Television Systems (AREA)
- Selective Calling Equipment (AREA)
Abstract
The present invention relates to monitoring fields, are concretely a kind of monitoring sound intermediate frequency signal transmitting apparatus, including audio collection unit, transmission unit and remote interface.Audio collection unit acquires the audio signal at monitoring；Transmission unit further comprises: converter, and the audio signal that audio collection unit acquires is converted to current signal by voltage signal；The output interface being connected with the converter, and connect by least 1 core cable with remote interface, the current signal of audio signal is sent；Remote interface receives the current signal of the audio signal, and the current signal is converted to voltage signal and sends rear end Monitor Equipment to.Example through the invention can reduce signal interference of the audio signal in monitoring transmission, so that difficulty of construction reduces, and can reduce the cost of transmission cable.
Description
This application claims submission on July 17th, 2013 Patent Office of the People's Republic of China, application No. is 201320426096.9, denomination of invention
For a kind of priority of the Chinese patent application of " monitoring sound intermediate frequency signal transmitting apparatus ", entire contents are hereby incorporated by reference
In the application.
Technical field
The invention belongs to monitoring technology field more particularly to a kind of monitoring sound intermediate frequency signal transmitting apparatus.
Background technique
Voice pickup and analog audio electrical signal transmission device, that is, monitoring picker in audio/video monitor and control system.The prior art
Middle sound pick-up is powered by external power supply, interface signal be normally defined audio output, power supply just, power supply is negative and audio it is public
End altogether, i.e., 3 usually said line sound pick-up interfaces.The advantages of 3 line interface be it is simple and convenient, can be directly connected to distal end
Equipment, such as monitoring hard disk video recorder, network monitoring video recorder and computer sound card etc..But since audio signal uses voltage signal
It exports, influences to generate noise vulnerable to external interference source in transmission process, height is required to transmission line, only supershielded line is used to pass
Defeated signal more could effectively obstruct external disturbance, reduce noise.It is usually necessary to use 1~3 core screens for different engineering construction cases
Line is covered, in long distance signal transmission, project cost is excessively high.
3 line interface brings another problem is that power supply connection randomness, engineering construction personnel can have very much
Kind of method is that sound pick-up is powered, and if powered nearby with power supply adaptor, from distal end centrally connected power supply, and is taken the photograph in audio/video monitor and control system
Camera shares the various ways such as power supply.These power supply modes can make system enter working condition, but caused noise problem
Different.Otherness, power supply and the variation of signal transmission distance of power supply performance, share taking the photograph for power supply with sound pick-up
The performance difference of camera can all make noise change.Same construction wiring method, has noise sometimes, does not make an uproar but sometimes
Sound, in different location, its noise is not also identical.These problems keep numerous engineering construction personnel extremely puzzled, construction quality also no
To guarantee.
Summary of the invention
The present invention needs high using price to solve the transmission of audio signal in the prior art vulnerable to interference in engineering construction
The problem of expensive 3 core shielded cable, provide a kind of monitoring sound intermediate frequency signal transmitting apparatus can using 1 core or 2 core cables,
Wherein 2 core cables can be for example the low-cost unshielded cables such as twisted pair, telephone wire, cable, RVV line, and be not necessarily to
Worry the transmission interference problem of audio signal.Engineering wiring method of supplying power to is simple and single, reduces engineering construction personnel's mistake
Construction wiring causes the risk of noise jamming.
The embodiment of the invention provides a kind of monitoring sound intermediate frequency signal transmitting apparatus, including,
Audio collection unit, transmission unit, remote interface；
Audio signal at the audio collection unit acquisition monitoring；
The transmission unit further comprises:
The audio signal that the audio collection unit acquires is converted to electric current by voltage signal by converter
Signal；
Output interface is connected with the converter, and the current signal of audio signal is passed through at least 1 core
Cable is sent；
The remote interface receives the current signal of the audio signal, and the current signal is converted to voltage signal,
Send rear end monitoring system to.
A further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention, institute
It states transmission unit and still further comprises amplifier, receive the audio signal of the audio collection unit output, and after amplification
Send the converter to.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
The output interface of the transmission unit still further comprises diode bridge, the converter is connected to, for being compatible with
Connect 2 core cables for just connecing or being reversely connected of remote interface.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
The transmission unit further includes power supply unit, is powered to the audio collection unit and transmission unit.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
The output interface is connect by 2 core cables with remote interface, and the current signal of audio signal is sent by wherein 1 core cable
It goes out, another 1 core cable is used as power supply line.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
When N number of audio collection unit and N number of transmission unit work together, N number of audio collection unit and N number of transmission unit
The power supply line is shared, and transmits the current signal for the audio signal that each transmission unit exports by N data line.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
Multiple transmission units and connect be followed by can be realized to a remote interface to the multiple transmission unit connection multiple audios adopt
Collect the audio mixing of the acquired audio signal of unit.Cable material, thickness, length and and position is connect all to the intensity of audio signal without shadow
It rings.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
The remote interface further comprises amplifier and audio treatment unit, and the amplifier puts the voltage signal after the conversion
Greatly, the audio treatment unit can be analog hardware for audio signal noise reduction, clarity enhancing and other effect process
DSP or other digital circuits can also be used in circuit.
Another further aspect of a kind of monitoring sound intermediate frequency signal transmitting apparatus according to embodiments of the present invention,
The remote interface further includes audio-frequency transformer, is connected with the audio treatment unit, and the voltage signal is further filtered out
In noise.
Example through the invention can reduce signal interference of the audio signal in monitoring transmission, so that difficulty of construction
It reduces, and can reduce the cost of transmission cable.
Detailed description of the invention
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 show a kind of structural schematic diagram for monitoring sound intermediate frequency signal transmitting apparatus of the present invention；
Fig. 2 show a kind of circuit diagram for monitoring sound intermediate frequency signal transmitting apparatus of the embodiment of the present invention；
Fig. 3 show the schematic diagram of the present invention multiple transmission units and remote interface；
Fig. 4 show the schematic diagram that audio signal transmission device of the embodiment of the present invention borrows video camera DC power supply main track；
Fig. 5 show a kind of signal transmission structure schematic diagram of audio collection array of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
It is as shown in Figure 1 a kind of structural schematic diagram for monitoring sound intermediate frequency signal transmitting apparatus of the present invention.
Including audio collection unit 101, transmission unit 102, remote interface 103；
The audio collection unit 101 acquires the audio signal at monitoring.
The transmission unit 102 further comprises converter 1021, and the audio collection unit 101 is adopted
The audio signal of collection is converted to current signal by voltage signal；
Output interface 1022 is connected with the converter 1021, by the current signal of the audio signal
It is sent by least 1 core cable.
The remote interface 103 receives the current signal of the audio signal, and the current signal is converted to voltage letter
Number, send rear end monitoring system to.
As an embodiment of the present invention, the transmission unit 102 still further comprises amplifier 1023, described in reception
The audio signal that audio collection unit 101 exports, and the converter 1021 is sent to after amplification.
As an embodiment of the present invention, the transmission unit 102 further includes power supply unit 1025, is adopted to the audio
Collect unit and transmission unit power supply.
As an embodiment of the present invention, the output interface is connect by 2 core cables with remote interface, and audio is believed
Number current signal sent by wherein 1 core cable, another 1 core cable be used as power supply line.
As an embodiment of the present invention, the output interface 1022 of the transmission unit 102 still further comprises two poles
Pipe bridge 1024 is connected to the converter 1021, just connecing or be reversely connected for compatible connection remote interface 103
1 core or 2 core cables.
As an embodiment of the present invention, when N number of audio collection unit 101 and the common work of N number of transmission unit 102
When making, N number of audio collection unit 101 and N number of transmission unit 102 share the power supply line, and are transmitted by N data line
The current signal for the audio signal that each transmission unit 102 exports.
As an embodiment of the present invention, the remote interface 103 further comprises amplifier 1031 and audio processing
Unit 1032 (in certain embodiments can using high-pass filter realize), the amplifier 1031 is by the electricity after the conversion
Signal amplification is pressed, the audio treatment unit 1032 filters the noise filtering in the amplified voltage signal using high pass
When wave device is implemented, the low-frequency noise in voltage signal can be filtered out.
As an embodiment of the present invention, the remote interface 103 further includes audio-frequency transformer 1033, with the audio
Processing unit 1032 is connected, and further filters out the noise in the voltage signal.
As an embodiment of the present invention, multiple transmission units 101 and connecing are followed by a remote interface, that is, used
Microphone array or multiple microphones acquire multipath audio signal, are then divided by multiple transmission units by superimposed electricity
Manifold formula audio signal is sent to the same remote interface by 2 cores or 1 core cable and is received.
As an embodiment of the present invention, the audio collection unit and transmission unit are by the video camera in monitoring system
Power supply power supply, the i.e. power supply line of audio collection unit 101 and transmission unit 102 be connected with the supply lines of the video camera by
The supply lines of the video camera is powered.
Through the foregoing embodiment, transmission current signal can be easy in the transmission to avoid audio signal to rear end monitoring server
The problem of being interfered, using unshielded 2 core cable and with other signals power cable (22OVAC/110VAC power cable,
24VAC power cable, DC power supply, video signal cable, local area network signal cable, telephone cable and other control signals electricity
Cable) when spacing close over long distances is parallel or shared wire casing is laid, it can effectively inhibit interference noise.Local area network signal electricity can be borrowed
Cable, telephone cable, vision signal paired line transmission device signal cable, control signal cable free time core or other buildings are comprehensive
Routing network idling-resource completes signal transmission and powers to sending device.Centrally connected power supply side is used in audio/video monitor and control system
When formula is constructed, video camera DC power anode line can be borrowed as the power supply core wire in 2 core connecting lines.Study test result card
Bright this method equally has good interference free performance.Multiple sending devices, which can and connect, to be followed by distally connecing to one or more
Mouthful, realize multichannel sound mixing function.Cable material, thickness, length and and position is connect all on the intensity of audio signal without influence.Also have
Have the advantages that circuit structure is simple and cost is cheap, in audio/video monitor and control system and other systems before extensive application
Scape.2 cores or 3 core shielded cables that existing monitoring picker uses can be substituted with 1 core or the unshielded cable of 2 cores.Reducing work
While journey cost, it is ensured that signal transmission will not be interfered, and be convenient for engineering cable wiring manufacture.
It is illustrated in figure 2 a kind of circuit diagram for monitoring sound intermediate frequency signal transmitting apparatus of the embodiment of the present invention.
Transmission unit in figure includes microphone M1, and resistance R3 is power supply and the load resistance of electret microphone M1, wheat
Gram wind M1 converts sound into audio voltage signal, and audio voltage signal is bonded to microphone by capacitance C4, C8 lotus root and amplifies
Device OP1, R9 are used to adjust the gain of OP1.The audio voltage signal of OP1 output is bonded to mould group U1 through R6 and C3 lotus root, mould group U1
Audio voltage signal is converted into tone currents signal Iin, U1 at the end Iout exports tone currents signal Io after amplifying Iin.
Mould group U1 is used as regulated power supply output voltage Vreg (to can connect the camera power supply in video monitoring system to obtain simultaneously
Power supply), it is that microphone M1 and microphone amplifier OP1 powers.Electric current Io flows to distal end through diode bridge D2 and by transmission line
Interface.Diode bridge D2 be used for guarantees connection transmission unit and remote interface 2 core cables in the case where just connecing or being reversely connected, all
It can work normally.
Wherein, the power supply of the transmission unit can borrow the power supply in monitoring system video monitoring, and 2 core cable can
Think individual 2 core cable (shielding or unmasked cable), can also using local area network signal cable, telephone cable,
Vision signal paired line transmission device signal cable, control signal cable free time core or other buildings integrative wire laying network idles
Cable of the resource as transmission, wherein 1 core is data line, another 1 core is power supply line.
In another embodiment, it can be illustrated in figure 3 the schematic diagram of the present invention multiple transmission units and remote interface,
Wherein for N number of transmission unit and N number of remote interface, it is only necessary to the transmission cable of N+1 core, that is, N core cable is for transmitting
The collected tone currents signal I of transmission unit1、I2…In, it is also necessary to 1 core cable is used as power supply line, N number of transmission unit
Video camera DC power anode line 301 can be borrowed as the power supply core wire in connecting line.
Remote interface part in Fig. 2 further includes that (in this case, it is resistance R12, certainly also for current/voltage converter
Other current/voltage converters can be used), tone currents signal Io generation when flowing through resistance R12 of transmission unit output
Audio voltage signal, this voltage signal are coupled to amplifier OP2 through C9, R10 and amplify, and R11 is used to control the increasing of OP2
Benefit.OP3 and periphery Resistor-Capacitor Unit form a high-pass filter and can also adopt for eliminating the low-frequency noise in voice signal
With other filtering Dolby circuits or chip, analog hardware circuit can be used for example, DSP or other digital circuits can also be used
Realize noise processed.OP3 output signal leads to R7, C7, audio-frequency transformer T1 is sent to output wiring terminal P3, P4, the terminals
Sub- P3, P4 are connected to the monitoring system on backstage, wherein the audio-frequency transformer T1 is for further filtering in audio voltage signal
Noise.P1, P2 are DC power supply input wires terminals, and D1 is used for input power reverse connecting protection.Input power is simply filtered through C1
Voltage V+ afterwards, can be used as the use of transmission unit internal electric source, and V+ is sent through transmission line to transmission unit by connecting terminal P6.
It is illustrated in figure 4 the signal that audio signal transmission device of the embodiment of the present invention borrows video camera DC power supply main track
Figure.
Transmission unit 401 connects 403 anode of power supply of video camera 402 in video monitoring in figure, by tone currents
Signal is sent to background monitoring server by 1 core cable 404 and remote interface 405, and the remote interface 405 is gone back and video camera
403 negative of power supply connect to constitute current supply circuit.
It is illustrated in figure 5 a kind of signal transmission structure schematic diagram of audio collection array of the embodiment of the present invention, in the figure
Multiple transmission units 501 and connecing are followed by a remote interface 502, that is, use microphone array or multiple microphones, acquisition
Then the audio signal of current forms after superposition is passed through 2 cores or 1 core cable by multiple transmission units by multipath audio signal
It is sent to the same remote interface to be received, the audio mixing of audio collection sound intermediate frequency signal may be implemented by the embodiment.
Through the foregoing embodiment, transmission current signal can be easy in the transmission to avoid audio signal to rear end monitoring server
The problem of being interfered, using unshielded 2 core cable and with other signals power cable (220VAC/110VAC power cable,
24VAC power cable, DC power supply, video signal cable, local area network signal cable, telephone cable and other control signals electricity
Cable) when spacing close over long distances is parallel or shared wire casing is laid, it can effectively inhibit interference noise.Local area network signal electricity can be borrowed
Cable, telephone cable, vision signal paired line transmission device signal cable, control signal cable free time core or other buildings are comprehensive
Routing network idling-resource completes signal transmission and powers to sending device.Centrally connected power supply side is used in audio/video monitor and control system
When formula is constructed, video camera DC power anode line can be borrowed as the power supply core wire in 2 core connecting lines.Study test result card
Bright this method equally has good interference free performance.Multiple sending devices can and connect use, realize multichannel sound mixing function.Line
Cable material, thickness, length and simultaneously vicinal is set all on the intensity of audio signal without influence.Also there is circuit structure simply to make with cost
The cheap advantage of valence, the extensive application prospect in audio/video monitor and control system and other systems.It can be replaced with the unshielded cable of 2 cores
2 cores used for existing monitoring picker or 3 core shielded cables.While reducing project cost, it is ensured that signal transmission will not
It is interfered, is convenient for engineering cable wiring manufacture.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of monitoring sound intermediate frequency signal transmitting apparatus, it is characterised in that including,
Audio collection unit, transmission unit, remote interface；
Audio signal at the audio collection unit acquisition monitoring；
The transmission unit further comprises:
The audio signal that the audio collection unit acquires is converted to current signal by voltage signal by converter；
Output interface is connected with the converter, and the output interface is connected by 2 core cables and remote interface
It connects, the current signal of audio signal is sent by wherein 1 core cable, another 1 core cable is used as power supply line；
The remote interface receives the current signal of the audio signal, and the current signal is converted to voltage signal, transmission
Give rear end monitoring system；
Wherein, multiple transmission units and connecing are followed by a remote interface；
When N number of audio collection unit and N number of transmission unit work together, N number of audio collection unit and N number of transmission
Power supply line described in units shared, and transmit by N data line the current signal of the audio signal of each transmission unit output.
2. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 1, which is characterized in that the transmission unit is also
Further comprise amplifier, receive the audio signal of the audio collection unit output, and sends the electricity to after amplification
Pressure/current converter.
3. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 1, which is characterized in that the transmission unit is also
Including power supply unit, power to the audio collection unit and transmission unit.
4. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 1, which is characterized in that the transmission unit
Output interface still further comprises diode bridge, is connected to the converter.
5. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 1, which is characterized in that the remote interface into
One step includes amplifier and audio treatment unit, and the amplifier amplifies the voltage signal after the conversion, at the audio
Unit is managed, audio signal noise reduction is used for.
6. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 5, which is characterized in that the remote interface is also
Including audio-frequency transformer, it is connected with the audio treatment unit, further eliminates the noise in the output voltage signal.
7. a kind of monitoring sound intermediate frequency signal transmitting apparatus according to claim 1, which is characterized in that the audio collection list
Member and transmission unit are powered by the camera power supply in monitoring system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201480040692.0A CN105379262B (en) | 2013-07-17 | 2014-04-02 | A kind of monitoring sound intermediate frequency signal transmitting apparatus |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320426096 | 2013-07-17 | ||
| CN2013204260969 | 2013-07-17 | ||
| PCT/CN2014/074602 WO2015007106A1 (en) | 2013-07-17 | 2014-04-02 | Device for monitoring audio signal transmission |
| CN201480040692.0A CN105379262B (en) | 2013-07-17 | 2014-04-02 | A kind of monitoring sound intermediate frequency signal transmitting apparatus |
Publications (2)
| Publication Number | Publication Date |
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| CN105379262A CN105379262A (en) | 2016-03-02 |
| CN105379262B true CN105379262B (en) | 2019-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201480040692.0A Active CN105379262B (en) | 2013-07-17 | 2014-04-02 | A kind of monitoring sound intermediate frequency signal transmitting apparatus |
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| Country | Link |
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| CN (1) | CN105379262B (en) |
| WO (1) | WO2015007106A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830764B (en) * | 2019-10-09 | 2024-05-07 | 北京睿声智诚科技有限责任公司 | Connecting device, switch and network audio/video monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2593464Y (en) * | 2002-11-29 | 2003-12-17 | 刘洪波 | Current mode transconductance linear audio-frequency amplifier |
| CN1804348A (en) * | 2006-01-18 | 2006-07-19 | 北京工业大学 | Visible intercom gate inhibition system for building |
| CN101013920A (en) * | 2006-09-22 | 2007-08-08 | 深圳市欧美亚实业有限公司 | Fiber emitting and receiving system for transmitting audio signal |
| CN102241365A (en) * | 2011-06-16 | 2011-11-16 | 三一汽车起重机械有限公司 | Crane, and apparatus and method for transmitting remote throttle signal thereof |
| CN202648766U (en) * | 2011-12-08 | 2013-01-02 | 上海发电设备成套设计研究院 | Coal feeder intelligent weighing sensor |
-
2014
- 2014-04-02 CN CN201480040692.0A patent/CN105379262B/en active Active
- 2014-04-02 WO PCT/CN2014/074602 patent/WO2015007106A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2593464Y (en) * | 2002-11-29 | 2003-12-17 | 刘洪波 | Current mode transconductance linear audio-frequency amplifier |
| CN1804348A (en) * | 2006-01-18 | 2006-07-19 | 北京工业大学 | Visible intercom gate inhibition system for building |
| CN101013920A (en) * | 2006-09-22 | 2007-08-08 | 深圳市欧美亚实业有限公司 | Fiber emitting and receiving system for transmitting audio signal |
| CN102241365A (en) * | 2011-06-16 | 2011-11-16 | 三一汽车起重机械有限公司 | Crane, and apparatus and method for transmitting remote throttle signal thereof |
| CN202648766U (en) * | 2011-12-08 | 2013-01-02 | 上海发电设备成套设计研究院 | Coal feeder intelligent weighing sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015007106A1 (en) | 2015-01-22 |
| CN105379262A (en) | 2016-03-02 |
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