CN208285421U - Suppressor - Google Patents
Suppressor Download PDFInfo
- Publication number
- CN208285421U CN208285421U CN201820691737.6U CN201820691737U CN208285421U CN 208285421 U CN208285421 U CN 208285421U CN 201820691737 U CN201820691737 U CN 201820691737U CN 208285421 U CN208285421 U CN 208285421U
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- China
- Prior art keywords
- suppressor
- transmitter
- signal
- utility
- model
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Abstract
The utility model provides a kind of suppressor comprising the transmitters and receivers connected by cable.The transmitter includes sequentially connected high-pass filter, radio-frequency modulator and amplifying circuit, receiver includes sequentially connected attenuator and demodulator, wherein, transmitters and receivers use all-metal closure, and are disposed with two layers of shielding case in the enclosure interior of transmitter.According to the utility model, the decaying and frequency distortion of transmission of video can be compensated, transmission range is substantially prolonged, improve image sharpness according to cable transmission characteristic.
Description
Technical field
The utility model relates to security product technical field more particularly to a kind of suppressors.
Background technique
Elevator shaft is a more complicated environment, and power, illumination, fan, control are usually arranged in elevator shaft
Cables, the various cables such as system, communication can all generate electromagnetic radiation.Coaxial cable used in video signal transmission " can also receive " this
A little interference, i.e. interference electromagnetic field generate interference induced current on coax, this interference induced current also will be coaxial
Interference inductive voltage (electromotive force) is generated on cable outer conductor (mesh grid) longitudinal electrical resistance, this interference inductive voltage is just connected
In video signal transmission circuit, so that the video monitoring image of many projects is by different degrees of interference, this is always most
It is common, be most difficult to tackle, be also one of problem of greatest concern.
Suppressor is used in prior art in composite video signal Transmission system, for eliminating in safety monitoring
The interference of video signal system and the transmission range for extending vision signal.A kind of suppressor uses the nothing being made of inductance capacitance
Source low-pass filter filters out the signal other than frequency range shared by vision signal.In practical applications for different interference sources
It possibly can not work, and passive low ventilating filter will increase the decaying of vision signal.Another suppressor is put using operation
The characteristic resistant to common code interference of big device is interfered to remove, this has stronger rejection ability to electromagnetic induction noise, but to electrostatic sense
It answers the rejection ability of caused noise poor, and is difficult to complete equipilibrium transmission.
Utility model content
In view of the deficiencies of the prior art, vision signal can be effectively improved the purpose of this utility model is to provide one kind to pass
The suppressor of transmission quality.
To achieve the goals above, the utility model provides a kind of suppressor comprising the transmission connected by cable
Device and receiver, transmitter include sequentially connected high-pass filter, radio-frequency modulator and amplifying circuit, and receiver includes successively
The attenuator and demodulator of connection, wherein transmitters and receivers use all-metal closure, and in the shell of transmitter
Inside is disposed with two layers of shielding case.
Preferably, the amplifying circuit includes one or more levels operational amplification circuit.It is furthermore preferred that the amplifying circuit packet
Include operational amplifier OP37 and its peripheral circuit.
Preferably, the receiver further includes the coupling circuit connecting with attenuator, to filter out because equipment ground point is different
The interference that the radiofrequency signal received is generated.
Preferably, the transmitter is connected with the receiver by coaxial cable.
Preferably, each layer of two layers of shielding case includes metallic shield web plate or conductive fibre fabric.
According to the utility model, the decaying and frequency distortion of transmission of video can be compensated according to cable transmission characteristic,
Transmission range (up to 1000m) is substantially prolonged, image sharpness is improved.
In addition, transmitters and receivers use all-metal closure, and two are disposed in the enclosure interior of transmitter
Layer shielding case, enhances the anti-interference ability of equipment.
Detailed description of the invention
It will be briefly described attached drawing used in this application below, it should be apparent that, these attached drawings are only used for explaining that this is practical
Novel design.
Fig. 1 is a kind of circuit structure diagram of suppressor of the utility model；
Fig. 2 is that a kind of suppressor of the utility model is applied to the circuit structure diagram of elevator monitoring；
The elevator monitoring when suppressor of elevator monitoring and use the utility model when Fig. 3 is not using suppressor
Monitoring image comparison diagram.
Specific embodiment
Hereinafter, the embodiment of the suppressor of the utility model is described with reference to the accompanying drawings.
The embodiment recorded herein is the specific specific embodiment of the utility model, for illustrating the utility model
Design, be it is explanatory and illustrative, should not be construed as the limit to the utility model embodiment and the scope of the utility model
System.In addition to the embodiment recorded herein, those skilled in the art can also be public based on the claim of this application book and specification institute
The content opened using obvious other technical solutions, these technical solutions include the embodiment recorded herein is made it is any
The technical solution of obvious substitutions and modifications.
The attached drawing of this specification is schematic diagram, aids in illustrating the design of the utility model, it is schematically indicated each section
Correlation.It note that for the ease of clearly showing the relationship of each section of the utility model embodiment.It is same or similar
Reference marker for indicating the same or similar part.
Fig. 1 is a kind of circuit structure diagram of suppressor of the utility model.As shown, suppressor includes by same
The transmitter 1 and receiver 2 of shaft cable connection.Transmitter 1 includes sequentially connected high-pass filter 102, radio-frequency modulator 104
With amplifying circuit 106.High-pass filter 102 is the passive device being made of inductance, resistance and capacitor, defeated to the video received
Enter signal and be filtered processing, the vision signal for keeping frequency high-end passes through, and decays to the vision signal in frequency middle section, right
Signal plays balanced effect.Wherein, the design parameter of inductance, resistance and capacitor can according to the frequency characteristic of vision signal into
Row selection.Filtered signal is input to the signal input part of radio-frequency modulator 104.Radio-frequency modulator 104 uses dedicated collection
It is made at circuit chip, for exporting modulated signal after being modulated vision signal and carrier frequency.
By such as video camera signal collecting device export vision signal be broadband (10~6MHZ) small signal (1~
2Vpp), noise is relatively low, more sensitive to interference noise.Due to the presence of various interference sources and coupling channel in elevator environment,
If do not adopted an effective measure, interference can be generated to video system.According to the difference of interference signal frequency, video image is shown as
Band, twill, reticulate pattern, the interference of spininess line.Especially in story height, transmission line is longer, and the decaying of route is so that signal-to-noise ratio
It further decreases, interference can be more serious.According to the utility model, vision signal is modulated into using radio-frequency modulator 104
The vision carrier frequency of 40MHz, is transmitted after subsequent processing by cable, thus can effectively avoid various electromagnetic waves,
The interference (generally all between 0~30MHz) of power supply and motor, plays a role of anti-interference.
Modulated radiofrequency signal is output to the amplification that amplifying circuit 106 carries out signal power.Amplifying circuit 106 can be by
The good amplifier OP37 of high frequency characteristics and its peripheral circuit composition.The gain and input impedance of operational amplifier are all very high, output resistance
It is anti-very low, there is good signal-to-noise ratio.There is feed circuit when integrated transporting discharging closed loop, frequency distortion can be compensated.In order to mention
The amplification factor of high RST can form amplifying circuit 106 using operational amplifier more than second level.It can be transmitted according to signal
The amplitude of the decaying of signal caused by the length of route carrys out the series of Selecting operation amplifier.
When video signal transmission, cable is unbalanced to the decaying of signal, and high frequency attenuation is big, low cut is small, influences image
Details and color.If only carrying out Linear Amplifer (that is, low-and high-frequency uses same amplification using the amplifier of such as triode
Multiple), it will so that image definition reduces, color is thin out, it can be more obvious for longer-distance transmission.This is practical
It is novel by using high-pass filter and operational amplifier so that high fdrequency component in input signal obtain it is same as intermediate frequency component
Gain, improve frequency distortion.This improves the clarity of picture.
Radiofrequency signal is exported from the output end of amplifying circuit 106, and the receiver of suppressor is transferred to via coaxial cable
2.As shown in Figure 1, receiver 2 includes sequentially connected attenuator 202 and demodulator 204.It can be arranged before attenuator 202
Coupling circuit, to filter out the interference generated by equipment ground point difference.Attenuator 202 is adjusted the amplitude of signal, so that
Interference signal significantly reduces, until negligible.Then, demodulator 204 is sent to monitor by signals revivification at baseband signal
It is shown.
Transmitter 1 and receiver 2 use all-metal closure, to enhance the anti-jamming effectiveness of equipment.Shell is rectangular
Body structure, it is preferred to use the shielding material of good conductivity is made, such as aluminium.Grounding point should be connected with shell, and guarantee to shield
Cover shell and grounding point equipotential.In addition, using the direct outlet of connector, the inlet and outlet of shielded cable.
In order to further improve the anti-interference ability of high-power component, two layers of screen is disposed in the enclosure interior of transmitter 1
Cover cover.For example, one layer of shielding case is metallic shield web plate, another layer of shielding case is conductive fibre fabric.In this way, can be significantly reduced
The influence of various low-frequency disturbances in elevator environment.
Fig. 2 is that a kind of suppressor of the utility model is applied to the circuit structure diagram of elevator monitoring.As shown, by electricity
The camera 23 that source 22 powers images scene in elevator, and converts the image information of acquisition to the video counts of standard
According to so that real-time Transmission to corridor display is shown.Meanwhile vision signal be output to by the output port of display it is anti-
The transmitter 21 of interference unit, is modulated and amplifies, and vision signal is moved on to high-frequency signal, is mixed into it not in transmission process
Low frequency signal.Then, in receiving end demodulator by signals revivification at baseband signal, to substantially eliminate various low-frequency disturbances
Influence.Transmitter 21, receiver and corridor display use 12V DC power supply power supply, and corridor display can be with sensor
24 connections, to show the environmental parameter in elevator, such as temperature.
The elevator monitoring when suppressor of elevator monitoring and use the utility model when Fig. 3 is not using suppressor
Monitoring image comparison diagram.As shown, the clarity of elevator monitoring image obtains after using the suppressor of the utility model
It is apparent to improve.
The suppressor of the utility model there is certain amplification to make letter to improve signal-to-noise ratio vision signal
Number effective propagation path extend.The suppressor has vision signal equalization function simultaneously.Firstly, using high-pass filter pair
Signal is filtered, secondly, the signal amplitude of entire frequency range is improved by one or more levels amplifier, so that in input signal
High fdrequency component obtain same as intermediate frequency component gain, improve frequency distortion.This improves the clarity of picture.
The embodiment of the suppressor of the utility model is illustrated above.For the anti-interference of the utility model
The specific features of device can specifically be designed according to the effect of the feature of above-mentioned disclosure, these designs are those skilled in the art
What member can be realized.Moreover, each technical characteristic of above-mentioned disclosure is not limited to disclosed and other feature combination, this field
Technical staff can also purpose according to the present utility model carry out other combinations between each technical characteristic, to realize the utility model
Purpose subject to.
Claims (6)
1. a kind of suppressor, including the transmitters and receivers connected by cable, which is characterized in that transmitter includes successively
High-pass filter, radio-frequency modulator and the amplifying circuit of connection, receiver include sequentially connected attenuator and demodulator,
In, transmitters and receivers use all-metal closure, and are disposed with two layers of shielding case in the enclosure interior of transmitter.
2. suppressor as described in claim 1, which is characterized in that the amplifying circuit includes one or more levels operation amplifier
Circuit.
3. suppressor as claimed in claim 2, which is characterized in that the amplifying circuit include operational amplifier OP37 and its
Peripheral circuit.
4. the suppressor as described in one of claims 1 to 3, which is characterized in that the receiver further includes and the decaying
The coupling circuit of device connection, to filter out the interference generated by equipment ground point difference to the radiofrequency signal received.
5. the suppressor as described in one of claims 1 to 3, which is characterized in that the transmitter and the receiver pass through
Coaxial cable connection.
6. the suppressor as described in one of claims 1 to 3, which is characterized in that each layer of two layers of shielding case includes gold
Belong to shielding web plate or conductive fibre fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820691737.6U CN208285421U (en) | 2018-05-10 | 2018-05-10 | Suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820691737.6U CN208285421U (en) | 2018-05-10 | 2018-05-10 | Suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208285421U true CN208285421U (en) | 2018-12-25 |
Family
ID=64729447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820691737.6U Expired - Fee Related CN208285421U (en) | 2018-05-10 | 2018-05-10 | Suppressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208285421U (en) |
-
2018
- 2018-05-10 CN CN201820691737.6U patent/CN208285421U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181225 |