CN107978309A - A kind of campus dormitory active noise reduction system based on demographics - Google Patents
A kind of campus dormitory active noise reduction system based on demographics Download PDFInfo
- Publication number
- CN107978309A CN107978309A CN201711260946.1A CN201711260946A CN107978309A CN 107978309 A CN107978309 A CN 107978309A CN 201711260946 A CN201711260946 A CN 201711260946A CN 107978309 A CN107978309 A CN 107978309A
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- China
- Prior art keywords
- noise reduction
- demographics
- noise
- module
- dormitory
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- 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.)
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of campus dormitory active noise reduction system based on demographics, including power supply, detection switch, noise reduction switch, demographics module, noise detection module and active noise reduction module；The power input of noise reduction switch is connected with power supply, and the power output end of noise reduction switch is connected with active noise reduction module；The power input of detection switch is connected with power supply, and the power output end of detection switch is connected with noise detection module；The output terminal of the demographics module and the control signal of detection switch connect, and the output terminal of the noise detection module and the control signal of noise reduction switch connect.The present invention can control detection switch break-make by counting student's number in dormitory；And when detection switch turns on, by the noise size detected, control the break-make of noise reduction switch；Both the influence that ambient noise larger in the dormitory of campus produces student had been reduced, unnecessary electric power resource has been it also avoid and wastes.
Description
Technical field
The present invention relates to indoor noise reduction, more particularly to a kind of campus dormitory active noise reduction system based on demographics.
Background technology
In recent years, as the continuous of China Higher education's dimension expands, school's enrollment quantity is continuously increased, campus dormitory
Constantly enlarging, to facilitate student to stay；The campus of some schools is established and is examined in more quiet suburb, but for what is had a good transport service
Consider, still there is that the campus position of some schools is more noisy, also, school periphery can also form a living area in itself
Domain, noise is inevasible, and in the dormitory of campus, noise may produce harmful effect to the campus life of student, make
The unhealthy emotions such as the raw agitation of production, anxiety；Particularly during sleep, if subjected to the influence of noise, is very easy to make student
It is roused from sleep, or lies awake all night from sleeping, cause student have not enough sleep, is listless, and then is unfavorable for the normal study of student.
Therefore, for the dormitory of campus, reducing noise just becomes urgent problem, under normal circumstances, campus
Noise reduction measure be all based on passive noise reduction, such as sound insulation door and window, sound control glass etc., noise reduction and unobvious, and use
Such noise reduction mode, generally requires to close the doors and windows, is unfavorable for air flow；Therefore it provides a kind of active noise reduction system is realized
The noise reduction of campus dormitory is very necessary, and still, active noise reduction system generally requires to power, still, nobody in the dormitory of campus
In the case of be not necessarily to during active noise reduction, can so waste substantial amounts of electric power resource, therefore the drop in the dormitory of campus
Condition of making an uproar control is particularly significant.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of campus dormitory based on demographics actively
Noise reduction system, can control detection switch break-make by counting student's number in dormitory；And when detection switch turns on, lead to
The noise size detected is crossed, controls the break-make of noise reduction switch；Both ambient noise larger in the dormitory of campus had been reduced to student
The influence of generation, it also avoid unnecessary electric power resource and wastes.
The purpose of the present invention is what is be achieved through the following technical solutions：A kind of campus dormitory based on demographics is actively
Noise reduction system, including power supply, detection switch, noise reduction switch, demographics module, noise detection module and active noise reduction mould
Block；
The power input of the noise reduction switch is connected with power supply, power output end and the active noise reduction module of noise reduction switch
Connection；The power input of the detection switch is connected with power supply, power output end and the noise measuring mould of detection switch
Block connects；
The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise transducer is set
In in dormitory, the output terminal of noise transducer and the in-phase input end of voltage comparator connect, the anti-phase input of voltage comparator
End is connected with reference voltage source, and the output terminal of voltage comparator and the control signal of noise reduction switch connect；
The demographics module includes microprocessor and the channel counts submodule for being arranged at dormitory doorway, the channel counts
The output terminal of submodule is connected with microprocessor, and the output terminal of microprocessor and the control signal of detection switch connect.
The power supply is also directly connected with the demographics module, is powered for number statistical module.
The active noise reduction module includes sound pick-up, phase inverter and the loudspeaker being arranged in dormitory, the sound pick-up
Output terminal is connected with phase inverter, and the output terminal of phase inverter is connected with loudspeaker.
The channel counts submodule includes infrared reflection channel counter.
The noise reduction switch and detection switch include identical on-off circuit.
The on-off circuit includes PMOS tube T1 and triode Q1, and the source S of PMOS tube T1 is connected to the electricity of on-off circuit
Source input terminal；The drain D of PMOS tube T1 is connected to the power output end of on-off circuit, between the source S and drain D of PMOS tube T1
First resistor R1 is parallel with, the source S of PMOS tube T1 also passes sequentially through second resistance R2 and 3rd resistor R3 is connected to triode
The grid G of the collector C of Q1, PMOS tube T1 are connected between second resistance R2 and 3rd resistor R3；The emitter E of triode Q1
Ground connection, the base stage B of triode Q1 are connected with one end of the 4th resistance R4, and the other end of the 4th resistance R4 is connected to on-off circuit
Control signal.
The beneficial effects of the invention are as follows：In the present invention, demographics module can count student's number in dormitory, in place
In house during someone, control detection switch conducting, noise detection module start to work, in dormitory nobody when, control detection switch
Disconnect, noise detection module is stopped；So as to avoid dormitory in the case of nobody, electric power caused by noise detection module provides
Source wastes；Noise detection module can be controlled noise reduction switch according to the noise size detected, actively be dropped so as to control
Make an uproar modular power source break-make；It is smaller to the unnecessary noise reduction of indoor environment progress to avoid ambient noise；So as to which the present invention both reduced
The influence that larger ambient noise produces student in the dormitory of campus, it also avoid unnecessary electric power resource and wastes；Actively
In noise reduction module, the ambient noise in the dormitory of campus is gathered by sound pick-up, feeding phase inverter progress is anti-phase, and generation is same with noise
Frequency then by loudspeaker, sends and comes with ambient noise same frequency with the sound wave of amplitude antiphase with the signal of amplitude antiphase
Offset ambient noise so that reach reduce influence of noise effect, compared to tradition close sound insulation door and window passive noise reduction mode,
With cost is low, effect is good, be conducive to the advantage of air circulation.
Brief description of the drawings
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the principle schematic of on-off circuit.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, a kind of campus dormitory active noise reduction system based on demographics, including power supply, detection are opened
Pass, noise reduction switch, demographics module, noise detection module and active noise reduction module；
The power input of the noise reduction switch is connected with power supply, power output end and the active noise reduction module of noise reduction switch
Connection；The power input of the detection switch is connected with power supply, power output end and the noise measuring mould of detection switch
Block connects；
The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise transducer is set
In in dormitory, the output terminal of noise transducer and the in-phase input end of voltage comparator connect, the anti-phase input of voltage comparator
End is connected with reference voltage source, and the output terminal of voltage comparator and the control signal of noise reduction switch connect；
The demographics module includes microprocessor and the channel counts submodule for being arranged at dormitory doorway, the channel counts
The output terminal of submodule is connected with microprocessor, and the output terminal of microprocessor and the control signal of detection switch connect.
The power supply is also directly connected with the demographics module, is powered for number statistical module.
The active noise reduction module includes sound pick-up, phase inverter and the loudspeaker being arranged in dormitory, the sound pick-up
Output terminal is connected with phase inverter, and the output terminal of phase inverter is connected with loudspeaker.
The channel counts submodule includes infrared reflection channel counter, when someone enters dormitory, infrared external reflection
Formula channel counter, which counts, adds one, and when someone leaves dormitory, infrared reflection channel counter, which counts, subtracts one.
The noise reduction switch and detection switch include identical on-off circuit.
As shown in Fig. 2, the on-off circuit includes PMOS tube T1 and triode Q1, the source S of PMOS tube T1 is connected to out
The power input on powered-down road；The drain D of PMOS tube T1 is connected to the power output end of on-off circuit, the source S of PMOS tube T1
First resistor R1 is parallel between drain D, the source S of PMOS tube T1 also passes sequentially through second resistance R2 and 3rd resistor R3 and connects
The collector C of triode Q1 is connected to, the grid G of PMOS tube T1 is connected between second resistance R2 and 3rd resistor R3；Triode
The emitter E ground connection of Q1, the base stage B of triode Q1 are connected with one end of the 4th resistance R4, the other end connection of the 4th resistance R4
To the control signal of on-off circuit.
The principle of the present invention is as follows：In the dormitory of campus, channel counts submodule can count student's number in dormitory,
And student's number is transferred to microprocessor, when student's number is zero in dormitory（When there is no student in dormitory）, microprocessor is defeated
Going out low level signal, control detection circuit disconnects, and noise detection module is stopped, so as to avoid dormitory in the case of nobody,
Electric power resource caused by noise detection module wastes；When student's number is not zero in dormitory（When having student in dormitory）, it is micro-
Processor exports high level, control detection switch conducting, and noise detection module is started to work.Noise detection module can be according to inspection
The noise size measured, is controlled noise reduction switch, so as to control active noise reduction modular power source break-make；Avoid ambient noise
It is smaller that unnecessary noise reduction is carried out to indoor environment, specifically：After detection switch conducting, noise transducer can gather ring in real time
Border noise, and output voltage signal, to voltage comparator, the voltage signal of output is sized to the size of reflection noise, works as environment
Noise is larger so that when the voltage signal of noise transducer output is more than the voltage of reference voltage source, the same phase of voltage comparator
Input voltage is more than reverse inter-input-ing voltage, at this time, the control signal of voltage comparator output high level to noise reduction switch, and at this time
Noise reduction switch turns on, and active noise reduction equipment is started to work, to realize the noise reduction in the dormitory of campus；When ambient noise is smaller, noise
When the voltage signal of sensor output is less than the voltage of reference voltage source, voltage comparator homophase input voltage is less than anti-phase input
Voltage, voltage comparator export low level to the control signal of noise reduction switch, at this time noise reduction switch cut-off, active noise reduction equipment
It is stopped, therefore, by noise detection module, can controls the work of active noise reduction equipment according to the size of noise or stop
Only, and then it can not only realize active noise reduction is realized under larger noise circumstance, can also be closed under the less environment of noise actively
Noise reducing apparatus is to save electric power resource.During active noise reduction, the ambient noise in the dormitory of campus is gathered by sound pick-up, is sent
Enter phase inverter and carry out anti-phase, signal of the generation with noise same frequency with amplitude antiphase, then by loudspeaker, send and make an uproar with environment
Sound same frequency offsets ambient noise with the sound wave of amplitude antiphase, so as to reach reduction influence of noise, is closed compared to tradition
The passive noise reduction mode of sound insulation door and window, has that cost is low, effect is good, is conducive to the advantage of air circulation.
Claims (6)
- A kind of 1. campus dormitory active noise reduction system based on demographics, it is characterised in that：Opened including power supply, detection Pass, noise reduction switch, demographics module, noise detection module and active noise reduction module；The power input of the noise reduction switch is connected with power supply, power output end and the active noise reduction module of noise reduction switch Connection；The power input of the detection switch is connected with power supply, power output end and the noise measuring mould of detection switch Block connects；The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise transducer is set In in dormitory, the output terminal of noise transducer and the in-phase input end of voltage comparator connect, the anti-phase input of voltage comparator End is connected with reference voltage source, and the output terminal of voltage comparator and the control signal of noise reduction switch connect；The demographics module includes microprocessor and the channel counts submodule for being arranged at dormitory doorway, the channel counts The output terminal of submodule is connected with microprocessor, and the output terminal of microprocessor and the control signal of detection switch connect.
- A kind of 2. campus dormitory active noise reduction system based on demographics according to claim 1, it is characterised in that：Institute State power supply to be also directly connected with the demographics module, power for number statistical module.
- A kind of 3. campus dormitory active noise reduction system based on demographics according to claim 1, it is characterised in that：Institute Stating active noise reduction module includes being arranged at sound pick-up, phase inverter and loudspeaker in dormitory, the output terminal of the sound pick-up with it is anti- Phase device connects, and the output terminal of phase inverter is connected with loudspeaker.
- A kind of 4. campus dormitory active noise reduction system based on demographics according to claim 1, it is characterised in that：Institute Stating channel counts submodule includes infrared reflection channel counter.
- A kind of 5. campus dormitory active noise reduction system based on demographics according to claim 1, it is characterised in that：Institute Stating noise reduction switch and detection switch includes identical on-off circuit.
- A kind of 6. campus dormitory active noise reduction system based on demographics according to claim 5, it is characterised in that：Institute Stating on-off circuit includes PMOS tube T1 and triode Q1, and the source S of PMOS tube T1 is connected to the power input of on-off circuit； The drain D of PMOS tube T1 is connected to the power output end of on-off circuit, and is parallel between the source S and drain D of PMOS tube T1 The source S of one resistance R1, PMOS tube T1 also pass sequentially through second resistance R2 and 3rd resistor R3 is connected to the current collection of triode Q1 The grid G of pole C, PMOS tube T1 are connected between second resistance R2 and 3rd resistor R3；The emitter E ground connection of triode Q1, three The base stage B of pole pipe Q1 is connected with one end of the 4th resistance R4, and the control that the other end of the 4th resistance R4 is connected to on-off circuit is defeated Enter end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260946.1A CN107978309A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on demographics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260946.1A CN107978309A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on demographics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107978309A true CN107978309A (en) | 2018-05-01 |
Family
ID=62009099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711260946.1A Withdrawn CN107978309A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on demographics |
Country Status (1)
| Country | Link |
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| CN (1) | CN107978309A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04282695A (en) * | 1991-03-12 | 1992-10-07 | Mitsubishi Electric Corp | Active noise reduction device |
| JPH04348398A (en) * | 1991-01-30 | 1992-12-03 | Calsonic Corp | Active noise canceler |
| JP2000267674A (en) * | 1999-03-16 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Active silencer |
| US20040239503A1 (en) * | 2003-05-30 | 2004-12-02 | Rider William Matthew | Integrated electronic article surveillance and people counting system |
| JP2007296887A (en) * | 2006-04-27 | 2007-11-15 | Nissan Motor Co Ltd | Noise reducing device and method |
| CN202472785U (en) * | 2012-03-29 | 2012-10-03 | 吉林大学 | Pedestrian flow statistical device |
| CN202797874U (en) * | 2012-07-03 | 2013-03-13 | 青岛海信移动通信技术股份有限公司 | Over-voltage protection circuit and mobile terminal |
| CN106057189A (en) * | 2016-06-29 | 2016-10-26 | 广州恒成智道信息科技有限公司 | Indoor active noise reduction apparatus |
| CN106056206A (en) * | 2016-07-17 | 2016-10-26 | 兰岚 | Bus carrying number real-time forecasting system |
| CN106847254A (en) * | 2017-03-17 | 2017-06-13 | 浙江大学 | A kind of locality active noise reduction system |
| WO2017202304A1 (en) * | 2016-05-23 | 2017-11-30 | 中兴通讯股份有限公司 | Start-up and shut-down circuit |
| CN207587375U (en) * | 2017-12-04 | 2018-07-06 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on demographics |
-
2017
- 2017-12-04 CN CN201711260946.1A patent/CN107978309A/en not_active Withdrawn
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04348398A (en) * | 1991-01-30 | 1992-12-03 | Calsonic Corp | Active noise canceler |
| JPH04282695A (en) * | 1991-03-12 | 1992-10-07 | Mitsubishi Electric Corp | Active noise reduction device |
| JP2000267674A (en) * | 1999-03-16 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Active silencer |
| US20040239503A1 (en) * | 2003-05-30 | 2004-12-02 | Rider William Matthew | Integrated electronic article surveillance and people counting system |
| JP2007296887A (en) * | 2006-04-27 | 2007-11-15 | Nissan Motor Co Ltd | Noise reducing device and method |
| CN202472785U (en) * | 2012-03-29 | 2012-10-03 | 吉林大学 | Pedestrian flow statistical device |
| CN202797874U (en) * | 2012-07-03 | 2013-03-13 | 青岛海信移动通信技术股份有限公司 | Over-voltage protection circuit and mobile terminal |
| WO2017202304A1 (en) * | 2016-05-23 | 2017-11-30 | 中兴通讯股份有限公司 | Start-up and shut-down circuit |
| CN106057189A (en) * | 2016-06-29 | 2016-10-26 | 广州恒成智道信息科技有限公司 | Indoor active noise reduction apparatus |
| CN106056206A (en) * | 2016-07-17 | 2016-10-26 | 兰岚 | Bus carrying number real-time forecasting system |
| CN106847254A (en) * | 2017-03-17 | 2017-06-13 | 浙江大学 | A kind of locality active noise reduction system |
| CN207587375U (en) * | 2017-12-04 | 2018-07-06 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on demographics |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180501 |