CN201708879U - Noise inhibitor - Google Patents
Noise inhibitor Download PDFInfo
- Publication number
- CN201708879U CN201708879U CN2010201162458U CN201020116245U CN201708879U CN 201708879 U CN201708879 U CN 201708879U CN 2010201162458 U CN2010201162458 U CN 2010201162458U CN 201020116245 U CN201020116245 U CN 201020116245U CN 201708879 U CN201708879 U CN 201708879U
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- switch
- connector
- noise suppressor
- coupled
- coupler
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Abstract
The utility model relates to a noise inhibitor, which comprises a first connector, a first wave filter, a coupler, a logarithm detection and amplifier, a comparator, a switching controller, a first switch and a voltage regulator. The noise inhibitor with the structure can effectively prevent and inhibit uploaded radio frequency noise from entering coaxial cables of cable televisions.
Description
Technical field
The utility model refers to a kind of have a logarithm detection and an amplifier and an electronic switch especially relevant for a kind of noise suppressor, can prevent and effectively suppress to upload in the coaxial cable that radio noise enters cable TV.
Background technology
Cable television system can provide the user to download (download) signal of video signal (the about 54MHz-1000MHz of its frequency) or transmit data (the about 5MHz-42MHz of its frequency) to the main frame of cable television system to upload (upstream) mode in box on cable modem (cablemodem) or the television set (set top box) mode in the family at present.
So, the rf data of uploading that promptly has the signal of video signal of 54MHz-1000MHz and 5MHz-42MHz in the coaxial cable simultaneously.But when the user uploads data, may be positioned at cable end or other reason, be full of various noises in the cable, make noise also and then upload rf data and enter in the coaxial cable, so, will have a strong impact on signal transfer quality in the coaxial cable because of the user.
The technology that is adopted in present existing coupler (tap) or the distributor (distributor) all is to adopt anti-electromagnetic interference coil (EMI core) to suppress noise, it can only suppress a little but can not close and upload channel, noise will continue to enter in the coaxial cable, and therefore, effect is not remarkable.
The utility model content
At the shortcoming of above-mentioned existing coupler or distributor, the utility model provides a kind of noise suppressor, to improve above-mentioned shortcoming.
A purpose of the present utility model provides a kind of noise suppressor, and it has, and a logarithm detects and amplifier, can detect whether to upload signal and will enter in the coaxial cable.
Another purpose of the present utility model provides a kind of noise suppressor, it has one first switch, can detect and amplifier has detected and is unlocked when uploading signal in this logarithm, to enter in the coaxial cable so that upload signal, and when uploading end, close this first switch, enter in the coaxial cable thoroughly to prevent noise.
Another purpose of the present utility model provides a kind of noise suppressor, and its exportable DC power supply is used for box on other cable modem or the television set.
In order to achieve the above object, a kind of noise suppressor of the present utility model, it comprises: one first connector, in order to import a radiofrequency signal; One first filter is coupled to this first connector, can carry out filtering to this radiofrequency signal; One coupler is coupled to this first filter, can carry out sampling to the output signal of this first filter; One logarithm detects and amplifier, is coupled to this coupler, can carry out logarithm to the output signal of this coupler and detect and voltage amplification; One comparator is coupled to this logarithm and detects and amplifier, can carry out relatively the output signal of this logarithm detection and amplifier; One switch controller is coupled to this comparator, can export a control signal according to the output signal of this comparator; One first switch is coupled to this coupler and this switch controller respectively, can close or open according to this control signal, whether exports this radiofrequency signal with decision; One second connector is coupled to this first switch, in order to export this radiofrequency signal; And a voltage adjuster, the one end is coupled to one first DC power supply, and after converting this first DC power supply to one second DC power supply output for this first switch, logarithm detection and amplifier and comparator use.
The beneficial effects of the utility model: in sum, by the enforcement of noise suppressor of the present utility model, it has a logarithm detection and an amplifier and an electronic switch, can prevent from and effectively suppress to upload radio noise to enter cable TV; In addition, it also can provide power supply for advantages such as box uses on other cable modem or the television set, and therefore, the more existing really noise suppressor of the utility model has progressive.
Description of drawings
Fig. 1 is a schematic diagram, and it illustrates the block schematic diagram of the noise suppressor of the utility model one preferred embodiment.
Embodiment
For further understanding structure of the present utility model, feature and purpose thereof, the attached now detailed description with graphic and preferred embodiment as after.
Please refer to Fig. 1, it illustrates the block schematic diagram of the noise suppressor of this case one preferred embodiment.
As shown in the figure, noise suppressor of the present utility model, it comprises: one first connector 10; One first filter 20; One coupler 30; One logarithm detects and amplifier 40; One comparator 50; One switch controller 60; One first switch 70; One second connector 80; And one voltage adjuster 90 combine.
Wherein, this first connector 10 is for example and without limitation to the RJ-45 connector of the optical fiber connector (F-connector) or ethernet local area network network (Ethernet), in order to import in a radio frequency (RF) signal to a cable (figure does not show), its frequency is for example and without limitation to 5MHz-42MHz.
This first filter 20 is coupled to this first connector 10, can carry out filtering to this radiofrequency signal.This first filter 20 is for example and without limitation to logical (band-pass) filter of a band, and it filters frequency and is for example and without limitation to 5MHz-42MHz.
This coupler 30 is coupled to this first filter 20, can carry out sampling to the output signal of this first filter 20.This coupler 30 is for example and without limitation to a coil.
This logarithm detects and amplifier (log detector/controller) 40 is coupled to this coupler 30, can carry out logarithm to the output signal of this coupler 30 and detect and voltage amplification.This logarithm detects and amplifier 40 is for example and without limitation to an operational amplifier (OperationAmplifier), carries out voltage amplification again after can taking the logarithm to the output signal of this coupler 30 earlier, compares for this comparator 50.
This comparator 50 is coupled to this logarithm and detects and amplifier 40, can carry out relatively the output signal of this logarithm detection and amplifier 40.This comparator 50 is for example and without limitation to an operational amplifier, it has a reference voltage DC2.5V, when the output voltage of this logarithm detection and amplifier 40 is greater than or equal to DC2.5V, this comparator 50 is promptly exported high potential, otherwise, when the output voltage of this logarithm detection and amplifier 40 was lower than DC2.5V, this comparator 50 was promptly exported electronegative potential.
This switch controller 60 is coupled to this comparator 50, can export a control signal according to the output signal of this comparator 50.This switch controller 60 is for example and without limitation to an operational amplifier, and this control signal can be used as the clock signal that this first switch 70 of control opens (ON) or cuts out (OFF) then such as but not limited to a monostable oscillator signal.
This first switch 70 is coupled to this coupler 30 and this switch controller 60 respectively, can close or open according to this control signal, whether exports this radiofrequency signal with decision.This first switch 70 is for example and without limitation to the electronic switch of similar electric post (relay), opens when this control signal is high potential, and to export this cable to online for the radiofrequency signal of uploading that makes that this coupler 30 is coupled; Close when this control signal is electronegative potential, making this upload radiofrequency signal, can't to export this cable to online, enters in this cable to prevent noise.
This second connector 80 is coupled to this first switch 70, in order to export this radiofrequency signal.This second connector 80 is for example and without limitation to the RJ-45 connector of the optical fiber connector (F-connector) or Ethernet LAN, in order to export this radiofrequency signal to this cable.And this first connector 10 and this second connector 80 can identical (for example both be all the optical fiber connector or RJ-45 connector) or the mode of different (for example another is a RJ-45 connector for the optical fiber connector) dispose.
These voltage adjuster 90 one ends are coupled to one first DC power supply A, and this first DC power supply A are converted to output detects for this first switch 70, logarithm and amplifier 40 and comparator 50 uses behind the one second DC power supply B.This second DC power supply B also can be the reference voltage of this comparator 50.
In addition, noise suppressor of the present utility model further has a printed circuit board (PCB) 100 to carry this first connector 10, first filter 20, coupler 30, logarithm detection and elements such as amplifier 40, comparator 50, switch controller 60, first switch 70, second connector 80 and voltage adjuster 90, it is a prior art, and the emphasis of non-this case, so do not intend repeating to give unnecessary details at this.
In addition, noise suppressor of the present utility model further has a second switch 71, it places on this printed circuit board (PCB) 100 and between first switch 70 and this second connector 80, identical with this first switch 70, can close or open according to this switch-over control signal, it is online to cable whether to export this radiofrequency signal with control, and wherein this second switch 71 also is an electronic switch.
In addition, noise suppressor of the present utility model further has one second filter 35, its place on this printed circuit board (PCB) 100 and this coupler 30 and this logarithm detects and amplifier 40 between, can further carry out the bandpass filtering of 5MHz-42MHz, to strengthen its filter effect to the output signal of this coupler 30.
In addition, noise suppressor of the present utility model further has one the 3rd filter 75, it places on this printed circuit board (PCB) 100 and between this second switch 71 and this second connector 80, can further carry out the bandpass filtering of 5MHz-42MHz to the output signal of this second switch 71.
When running, if detecting this first connector 10, this logarithm detection and amplifier have radiofrequency signal to upload, then this comparator 50 will be exported high potential, make these switch controller 60 outputs have the monostable control signal of high potential, this first switch 70 and second switch 71 are opened simultaneously, therefore, radiofrequency signal can be uploaded in this cable; If this logarithm detects and amplifier when not detecting this first connector 10 and having radiofrequency signal to upload, then this comparator 50 will be exported electronegative potential, make the control signal of these switch controller 60 output electronegative potentials, this first switch 70 and second switch 71 are closed simultaneously, therefore, radiofrequency signal can't be uploaded in this cable, also can intercept noise simultaneously and enter in this cable.Therefore, the noise suppressor of noise suppressor of the present utility model prior art has when not uploading and can intercept the advantage that noise enters cable fully.
In addition, noise suppressor of the present utility model further has a power input 110; One switch power supply unit 120; An and power output end 130.
Wherein, an end of this power input 110 is coupled to an AC power, is for example and without limitation to AC 110-240V.
This switch power supply unit 120 is coupled to the other end of power input 110, exports this voltage adjuster 90 to after this AC power can being converted to this first DC power supply A.
These power output end 130 one ends are coupled to the output of this switch power supply unit 120, use for box on other cable modem or the television set in order to export this first DC power supply A.
In addition, noise suppressor of the present utility model further has a housing (figure does not show), with elements such as ccontaining this printed circuit board (PCB) 100, power input 110, switch power supply unit 120 and power output ends 130.This housing is such as but not limited to made by plastic material.
Therefore, noise suppressor of the present utility model can have simultaneously and intercepts noise and enter cable and the function of power supply for other distributor or coupler use is provided.
What the utility model disclosed is preferred embodiment, and patent right category of the present utility model is not all taken off in the change of every part or modification and come from technological thought of the present utility model and be easy to the person of knowing by inference by the people who is familiar with this skill.
Claims (14)
1. a noise suppressor is characterized in that, comprising:
One first connector is in order to import a radiofrequency signal;
One first filter is coupled to this first connector, and this radiofrequency signal is carried out filtering;
One coupler is coupled to this first filter, and the output signal of this first filter is carried out sampling;
One logarithm detects and amplifier, is coupled to this coupler, the output signal of this coupler is carried out logarithm detect and voltage amplification;
One comparator is coupled to this logarithm and detects and amplifier, and the output signal of this logarithm detection and amplifier is carried out relatively;
One switch controller is coupled to this comparator, exports a control signal according to the output signal of this comparator;
One first switch is coupled to this coupler and this switch controller respectively, closes or opens according to this control signal, whether exports this radiofrequency signal with decision;
One second connector is coupled to this first switch, in order to export this radiofrequency signal; And
One voltage adjuster, one end are coupled to one first DC power supply, and convert after one second DC power supply this first DC power supply to output for this first switch, logarithm detection and amplifier and comparator use.
2. noise suppressor as claimed in claim 1 is characterized in that, this first connector and second connector are optical fiber connector or RJ-45 connector.
3. noise suppressor as claimed in claim 1 is characterized in that, the frequency of this radiofrequency signal is 5MHz-42MHz, and this first filter is a band pass filter.
4. noise suppressor as claimed in claim 1 is characterized in that, this coupler is a coil, and this control signal is a monostable oscillator signal.
5. noise suppressor as claimed in claim 1 is characterized in that, this logarithm detects and amplifier is an operational amplifier, carries out voltage amplification again after the output signal of this coupler is taken the logarithm.
6. noise suppressor as claimed in claim 1 is characterized in that, this comparator and this switch controller are all an operational amplifier.
7. noise suppressor as claimed in claim 1 is characterized in that, this first switch is an electronic switch.
8. noise suppressor as claimed in claim 1, it is characterized in that further having a printed circuit board (PCB) to carry this first connector, first filter, coupler, logarithm detection and amplifier, comparator, switch controller, first switch, second connector and voltage adjuster.
9. noise suppressor as claimed in claim 8, it is characterized in that, further have one second filter, place on this printed circuit board (PCB) and this coupler and this logarithm detects and amplifier between, the output signal of this coupler is carried out the bandpass filtering of 5MHz-42MHz.
10. noise suppressor as claimed in claim 8, it is characterized in that, further has a second switch, place on this printed circuit board (PCB) and between this first switch and this second connector, close or open according to this switch-over control signal, whether export this radiofrequency signal with control, wherein this second switch also is an electronic switch.
11. noise suppressor as claimed in claim 10, it is characterized in that, further have one the 3rd filter, place on this printed circuit board (PCB) and between this second switch and this second connector, the output signal of this first switch is carried out the bandpass filtering of 5MHz-42MHz.
12. noise suppressor as claimed in claim 8 is characterized in that, further has:
One power input, the one end is coupled to an AC power;
One switch power supply unit is coupled to the other end of power input, exports this voltage adjuster to after converting this AC power to this first DC power supply; And
One power output end, the one end is coupled to the output of this switch power supply unit, in order to export this first DC power supply.
13. noise suppressor as claimed in claim 12 is characterized in that, this AC power is AC 110-240V, and this first DC power supply is DC 12V, and this second DC power supply is DC 2.5V.
14. noise suppressor as claimed in claim 12 is characterized in that, further has a housing, with ccontaining this printed circuit board (PCB), power input, switch power supply unit and power output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201162458U CN201708879U (en) | 2010-02-10 | 2010-02-10 | Noise inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201162458U CN201708879U (en) | 2010-02-10 | 2010-02-10 | Noise inhibitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201708879U true CN201708879U (en) | 2011-01-12 |
Family
ID=43446029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201162458U Expired - Fee Related CN201708879U (en) | 2010-02-10 | 2010-02-10 | Noise inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201708879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622643A (en) * | 2011-12-19 | 2012-08-01 | 华为终端有限公司 | Secure digital card capable of transmitting data via wireless network |
| EP2941797B1 (en) * | 2012-12-03 | 2019-11-20 | Dockon AG | Low noise detection system using log detector amplifier |
-
2010
- 2010-02-10 CN CN2010201162458U patent/CN201708879U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622643A (en) * | 2011-12-19 | 2012-08-01 | 华为终端有限公司 | Secure digital card capable of transmitting data via wireless network |
| WO2013091489A1 (en) * | 2011-12-19 | 2013-06-27 | 华为终端有限公司 | Secure digital card capable of transmitting data through wireless networks |
| EP2941797B1 (en) * | 2012-12-03 | 2019-11-20 | Dockon AG | Low noise detection system using log detector amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20110112 Termination date: 20180210 |