CN101499858A - Wideband noise suppressing system for communication machine room - Google Patents
Wideband noise suppressing system for communication machine room Download PDFInfo
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- CN101499858A CN101499858A CNA2008100064101A CN200810006410A CN101499858A CN 101499858 A CN101499858 A CN 101499858A CN A2008100064101 A CNA2008100064101 A CN A2008100064101A CN 200810006410 A CN200810006410 A CN 200810006410A CN 101499858 A CN101499858 A CN 101499858A
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Abstract
The invention relates to a broadband noise inhibiting system of communication rooms, in particular to a broadband noise inhibiting system that adopts the following technical proposal: a sensing unit detects a noise source that is generated by the running of a fan, obtains a noise signal and sends the signal to a signal amplifying unit, the signal amplifying unit realizes the signal amplification of the noise signal and sends the noise signal to a signal converting unit, thus converting the noise signal to a digital signal; a complex multi-channel controller realizes calibration and quick convergence operation according to the received digital signal, generates a reversed digital signal, and sends the reversed digital signal to the signal converting unit, thus converting the reversed digital signal to a reversed analog signal, and the signal amplifying unit realizes the power amplification of the received reversed analog signal and generates a control signal so as to drive a loudspeaker to emit interference sound wave, thus counteracting the noise source and achieving the goal for eliminating the broadband noise.
Description
Technical field
What the present invention relates to is a kind of wideband noise suppressing system, what be particularly related to is that a kind of noise source that produces by sensing unit detecting fan running transfers a noise signal to, and be sent in the digital signal microprocessor through signal amplify with conversion of signals after, via a multichannel combined type controller of digital signal microprocessor signal is done again and revised and convergence computing fast, and generation one control signal is sent the interference sound wave to offset noise source to order about a loud speaker after signal being done conversion and amplification in regular turn again, reaches the purpose of BROADBAND NOISE elimination.
Background technology
The technology of communication science and technology is now maked rapid progress, in order to make the communication quality service optimizes, make the practitioner set up communication machine room in each metropolitan area, situations such as signal engaged line, reception are bad improve to take place, swinging of signal, and communication machine room is to keep one of stable key of signal quality, therefore, communication machine room needs long manpower to safeguard, yet, long-time operating personnel in communication machine room, must bear communication machine room and produce noisy noise, and the source of these noises is the radiator fan of broadband network main frame or server work station.
And the problem of noise makes relevant dealer be subjected to suitable attention, because noisy noise can make the people produce in various degree uneasiness and anxiety sense, increases tired degree, reduces task performance, and also very the person can cause psychology and physiology to injure; Wait and suppress noise and the inhibition noise of existing communication machine room all is to use acoustical cotton, sound panel or operating personnel to wear earmuff, its above-mentioned one of passive type noise suppression method that belongs to, be merely able to the noise that isolated high frequency produces if use noise reduction cotton, sound panel or operating personnel to wear earmuff, the noise that produces for low frequency then can't effectively suppress noise.
But the inhibition noise of existing communication machine room still has following shortcoming:
1. the ability of the sound-absorbing of structure and material or sound penetrant structure, usually with frequency noise have sizable related, generally speaking, for high frequency noise, for example: 1k～20kHZ performance muffler is good, and for low frequency noise, for example: below the 1kHZ, then erasure effect is not good.
2. use acoustical cotton, sound panel to wait to completely cut off noise at communication machine room, just increase the waste of using in the space and there is no real benefit.
Therefore, how to solve above-mentioned existing problem and defective, the inventor who is this case desires most ardently the direction place that research improves with the relevant manufacturer that is engaged in the industry.
Summary of the invention
For solving the shortcoming of above-mentioned prior art, main purpose of the present invention, be to provide a kind of wideband noise suppressing system for communication machine room, be when detecting fan running by a sensing unit, the noise source that produces obtains a noise signal and is sent to signal amplification unit, after making signal amplification unit do the signal amplification to noise signal, being resent to signal conversion unit, to do conversion of signals be a digital signal, and multichannel combined type controller according to the digital signal that receives do revise with convergence computing fast after, to produce a reverse digital signal, oppositely digital signal is the signal opposite with the digital signal phase place, and be resent to signal conversion unit and be converted to an inverse analog signal, and after signal amplification unit amplifies the inverse analog signal power that receives, and produce a control signal big or small identical with the sound wave that orders about a loud speaker (Loud speaker) and send and noise source, phase place is opposite, carries out the action of sound wave superposition destruction interference, reaches the purpose that BROADBAND NOISE is eliminated.
Another object of the present invention, described signal amplification unit is provided with a pre-amplifier (Pre-Amplifie) and a post-amplifier (Power Amplifier), change the feed-forward signal that is produced when rotation speed of the fan, be sent to after pre-amplifier does signal and amplify with the noise signal of sensing unit detecting, and after being converted to digital signal by signal conversion unit, passing to multichannel combined type controller does correction and restrains computing fast and obtain reverse digital signal, and after via signal conversion unit conversion and post-amplifier power processing and amplifying, and send control signal and produce and to equate with noise source to order about loud speaker, the sound wave that phase place is opposite comes noise-decreasing, with the reduction BROADBAND NOISE that fan was produced, and make excellent in heat dissipation effect.
Description of drawings
Fig. 1 is a system schematic of the present invention;
Fig. 2 is a circuit box schematic diagram of the present invention;
Fig. 3 is a multichannel combined type controller equivalence block schematic diagram of the present invention.
Description of reference numerals: 1-digital signal microprocessor; The 330-post-amplifier; 10-multichannel combined type controller; The 2-sensing unit; 110-feed forward type controller; The 20-error microphone; 120-reaction type controller; The 21-reference microphone; The 20-signal conversion unit; The 4-loud speaker; The 210-analog/digital converter; The 40-loudspeaker; The 220-digital/analog converter; 5-communication machine enclosure; The 30-signal amplification unit; The 51-fan; The 310-pre-amplifier.
Embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.
The present invention is a kind of wideband noise suppressing system for communication machine room, see also Fig. 1, Fig. 2 and be a preferred embodiment of the present invention, native system is an independent monomer (Standalone) system as shown in the figure, the mode of its application is that the active noise control of multichannel is to process at the fan low frequency noise, and reduce noise effectively, and need not use personal computer to do auxiliary the use, to save cost; Described system comprises a digital signal microprocessor 1 (Digital Signal Processor at least, abbreviation DSP), a sensing unit 2 (Sensor) and a loud speaker (Loudspeaker) 4, wherein said sensing unit 2 is respectively equipped with four error microphone 20 and two reference microphone 21, described reference microphone 21 is that the noise source that 51 runnings of acquisition fan produce transfers a noise input signal to, and described error microphone 20 is the feedback signals in order to the detecting feedback error, and described loud speaker 4 is provided with four loudspeaker 40; Described digital signal microprocessor 1 is to comprise a multichannel combined type controller 10 (Multiple-channel hybrid controller), one signal conversion unit 20, one signal amplification unit 30, wherein said signal amplification unit 30 is done the signal processing and amplifying with the noise input signal and the feedback signal that receive, be sent to described signal conversion unit 20 again and be converted to a digital signal, making described multichannel combined type controller 10 do according to the digital signal that receives revises and convergence calculation fast, and obtain a reverse digital signal after the calculation, succeed, described multichannel combined type controller 10 is sent to described signal conversion unit 20 with reverse digital signal, described signal conversion unit 20 is converted to an inverse analog signal again with reverse digital signal, and after the inverse analog signal power processing and amplifying of described signal amplification unit 30 with reception, produce a control signal and send the interference sound wave to offset noise source, reach the purpose that BROADBAND NOISE is eliminated to order about described loudspeaker 40.
In described preferred embodiment, described signal amplification unit 30 is to be respectively equipped with a pre-amplifier 310 (Pre-Amplifier, or title prestage amplifier) with post-amplifier a 330 (Power Amplifier, or title power amplifier), wherein said pre-amplifier 310 has antimierophonic characteristic, and being noise input signal and the feedback signals that will receive, described pre-amplifier 310 does the signal processing and amplifying, and described pre-amplifier 310 and described error microphone 20, described reference microphone 21 is electrically connected, and described post-amplifier 330 is the inverse analog signal power processing and amplifying that receives, and described post-amplifier 330 is electrically connected with described loudspeaker 40; And described signal conversion unit 20 is provided with an analog/digital converter 210 (Analogue to Digital Converter, be called for short ADC) and a digital/analog converter 220 (Digital to Analogue Converter, be called for short DAC), wherein said analog/digital converter 210 is to receive through 310 amplifying signals of described pre-amplifier, and with conversion of signals is digital signal, and described analog/digital converter 210 and described pre-amplifier 310, multichannel combined type controller 10 is to form to be electrically connected, and described digital/analog converter 220 is to be converted to the inverse analog signal in order to the reverse digital signal that will receive, and described digital/analog converter 220 and described post-amplifier 330, multichannel combined type controller 10 is electrically connected.
See also Fig. 1-shown in Figure 3 again, described multichannel combined type controller 10 is made of a feed forward type controller 110 (Feed forward controller) and a reaction type controller 120 (Feed back controller), it is good and stable that described feedforward controller 110 has performance, and described reaction type controller 120 has the robustness that convergence is quick and promote disturbance; Be provided with two communication machine enclosures 5 in the described in addition communication machine room, and each described reference microphone 21 is furnished the side at each described communication machine enclosure 5 respectively, and described error microphone 20 and described loudspeaker 40 are placed on the opposite side of each described communication machine enclosure 5 respectively with two error microphone 20 and two loudspeaker 40.
When 51 runnings of the fan in two communication machine enclosures 5, be to capture the noise source of fans 51 generations and transfer a noise input signal to by reference microphone 21, with described error microphone 20 feedback signal of its detecting together is sent to pre-amplifier 310, after making that 310 pairs of described feedback signals of described pre-amplifier and noise input signal are done the signal processing and amplifying, be resent to described analog/digital converter 210, and described analog/digital converter 210 is a digital signal with the conversion of signals that receives, after making described feed forward type controller 110 that the digital feedback signal that receives and digital noise input signal are done computing, and obtain one first reverse digital signal, described reaction type controller 120 is also done the digital feedback signal that receives to revise with quick convergence computing and is obtained one second reverse digital signal simultaneously, after making described multichannel combined type controller 10 with the first reverse digital signal and the second reverse digital signal addition, be sent to described digital/analog converter 220 and be converted to the inverse analog signal, and described post-amplifier 330 is with the inverse analog signal power processing and amplifying that receives, and produce control signal and order about the big or small identical of sound wave that loudspeaker 40 send and noise source, phase place is opposite, carry out the action of sound wave superposition destruction interference, the purpose of eliminating with the BROADBAND NOISE that reaches fan on different size.
The present invention does not see open and uses, and meets the patent of invention important document yet, files an application in accordance with the law.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (4)
1. wideband noise suppressing system for communication machine room, it is applied to a communication machine room, it is characterized in that: it comprises: a loud speaker, sensing unit and a digital signal microprocessor, wherein, described sensing unit is respectively equipped with at least one error microphone and at least one reference microphone;
Described digital signal microprocessor is provided with:
One signal amplification unit, it is provided with a pre-amplifier and a post-amplifier, and described pre-amplifier is electrically connected with described error microphone, reference microphone, and described post-amplifier is electrically connected with described loud speaker;
One signal conversion unit, it is provided with an analog/digital converter and a digital/analog converter, and described analog/digital converter is electrically connected with described pre-amplifier, and described digital/analog converter is electrically connected with described post-amplifier;
One multichannel combined type controller, it is electrically connected with described analog/digital converter, described digital/analog converter.
2. wideband noise suppressing system for communication machine room according to claim 1 is characterized in that: described multichannel combined type controller is made of a feed forward type controller and a reaction type controller.
3. wideband noise suppressing system for communication machine room according to claim 1 is characterized in that: described loud speaker is loudspeaker.
4. wideband noise suppressing system for communication machine room according to claim 1 is characterized in that: described system is the system of an independent monomer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100064101A CN101499858B (en) | 2008-02-02 | 2008-02-02 | Wideband noise suppressing system for communication machine room |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100064101A CN101499858B (en) | 2008-02-02 | 2008-02-02 | Wideband noise suppressing system for communication machine room |
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| Publication Number | Publication Date |
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| CN101499858A true CN101499858A (en) | 2009-08-05 |
| CN101499858B CN101499858B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100064101A Expired - Fee Related CN101499858B (en) | 2008-02-02 | 2008-02-02 | Wideband noise suppressing system for communication machine room |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354492A (en) * | 2011-07-19 | 2012-02-15 | 南通立飞投资有限公司 | Device and method for intelligently and softly reducing noises |
| CN108632712A (en) * | 2018-06-22 | 2018-10-09 | 常州倍速智能科技有限公司 | A kind of anti-noise noise reduction pavilion with active noise reduction function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2590317Y (en) * | 2002-11-08 | 2003-12-03 | 深圳市和宏实业有限公司 | Microphone whistle eliminator |
| CN100495386C (en) * | 2004-07-08 | 2009-06-03 | 淇誉电子科技股份有限公司 | Digit audio frequency optimization apparatus |
-
2008
- 2008-02-02 CN CN2008100064101A patent/CN101499858B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354492A (en) * | 2011-07-19 | 2012-02-15 | 南通立飞投资有限公司 | Device and method for intelligently and softly reducing noises |
| CN108632712A (en) * | 2018-06-22 | 2018-10-09 | 常州倍速智能科技有限公司 | A kind of anti-noise noise reduction pavilion with active noise reduction function |
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| Publication number | Publication date |
|---|---|
| CN101499858B (en) | 2012-07-04 |
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Granted publication date: 20120704 Termination date: 20190202 |