CN107993645A - A kind of campus dormitory active noise reduction system based on Noise Acquisition - Google Patents
A kind of campus dormitory active noise reduction system based on Noise Acquisition Download PDFInfo
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- CN107993645A CN107993645A CN201711260950.8A CN201711260950A CN107993645A CN 107993645 A CN107993645 A CN 107993645A CN 201711260950 A CN201711260950 A CN 201711260950A CN 107993645 A CN107993645 A CN 107993645A
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- noise reduction
- noise
- switch circuit
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- voltage comparator
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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
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- 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 Noise Acquisition, including power supply, noise reduction switch circuit, noise detection module and active noise reduction module；The power input of the noise reduction switch circuit is connected with power supply, and the power output end of noise reduction switch circuit is connected with active noise reduction module；The noise detection module includes noise transducer, reference voltage source and voltage comparator, the noise transducer is arranged in dormitory, the output terminal of noise transducer and the in-phase input end of voltage comparator connect, the inverting input of voltage comparator is connected with reference voltage source, and the output terminal of voltage comparator is connected with the control signal of noise reduction switch circuit.The present invention can control noise reduction switch circuit turn-on in time, and then active noise reduction module is started to work, and noise is offset in a manner of active noise reduction, advantageously ensures that the peace and quiet in the dormitory of campus, improves the nighttime sleep quality of student when detecting that noise is larger.
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 Noise Acquisition.
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.
For now, noise reduction mode is mostly based on passive noise reduction in the dormitory of campus, such as sound control glass, sound insulation door and window
Deng, but this noise reduction mode is of high cost, while close the doors and windows during sleeping, it is unfavorable for air circulation.
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 Noise Acquisition actively
Noise reduction system, can control noise reduction switch circuit turn-on in time, and then active noise reduction module starts when detecting that noise is larger
Work, noise is offset in a manner of active noise reduction, advantageously ensures that the peace and quiet in the dormitory of campus, improves the nighttime sleep matter of student
Amount.
The purpose of the present invention is what is be achieved through the following technical solutions：A kind of campus dormitory based on Noise Acquisition is actively
Noise reduction system, including power supply, noise reduction switch circuit, noise detection module and active noise reduction module；
The power input of the noise reduction switch circuit is connected with power supply, power output end and the active of noise reduction switch circuit
Noise reduction module connects；The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise passes
Sensor is arranged in dormitory, and the output terminal of noise transducer and the in-phase input end of voltage comparator connect, voltage comparator
Inverting input is connected with reference voltage source, and the output terminal of voltage comparator is connected with the control signal of noise reduction switch circuit.
The power module is also directly connected with noise detection module, for powering for noise detection 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 noise reduction switch circuit includes PMOS tube T1 and triode Q1, and the source S of PMOS tube T1 is as noise reduction switch
The power input of circuit, is connected to power supply；Power output end of the drain D of PMOS tube T1 as noise reduction switch circuit,
Active noise reduction module is connected to, first resistor R1, the source S of PMOS tube T1 are parallel between the source S and drain D of PMOS tube T1
The collector C that second resistance R2 and 3rd resistor R3 is connected to triode Q1 is also passed sequentially through, the grid G of PMOS tube T1 is connected to
Between second resistance R2 and 3rd resistor R3；The emitter E ground connection of triode Q1, the base stage B and the 4th resistance R4 of triode Q1
One end connection, the control signal of the other end of the 4th resistance R4 as noise reduction switch circuit, the output with voltage comparator
End connection.
The beneficial effects of the invention are as follows：The present invention include noise detection module, can detection noise size, make an uproar detecting
When sound is larger, noise reduction switch circuit turn-on is controlled in time, and then active noise reduction module starts noise reduction work, advantageously ensures that campus
Peace and quiet in dormitory；And in active noise reduction module, the ambient noise in the dormitory of campus is gathered by sound pick-up, is sent into phase inverter
Anti-phase, signal of the generation with noise same frequency with amplitude antiphase is carried out, then by loudspeaker, is sent and ambient noise same frequency
Ambient noise is offset with the sound wave of amplitude antiphase, so as to reach the effect for reducing influence of noise, improving sleep quality, is compared
The passive noise reduction mode of sound insulation door and window is closed in tradition, has that cost is low, effect is good, is 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 noise reduction switch 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 Noise Acquisition, including power supply, noise reduction are opened
Powered-down road, noise detection module and active noise reduction module；
The power input of the noise reduction switch circuit is connected with power supply, power output end and the active of noise reduction switch circuit
Noise reduction module connects；The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise passes
Sensor is arranged in dormitory, and the output terminal of noise transducer and the in-phase input end of voltage comparator connect, voltage comparator
Inverting input is connected with reference voltage source, and the output terminal of voltage comparator is connected with the control signal of noise reduction switch circuit.
The power module is also directly connected with noise detection module, for powering for noise detection 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.
As shown in Fig. 2, the noise reduction switch circuit includes PMOS tube T1 and triode Q1, the source S of PMOS tube T1 is made
For the power input of noise reduction switch circuit, power supply is connected to；Electricity of the drain D of PMOS tube T1 as noise reduction switch circuit
Source output terminal, is connected to active noise reduction module, first resistor R1, PMOS tube is parallel between the source S and drain D of PMOS tube T1
The source S of T1 also passes sequentially through the collector C that second resistance R2 and 3rd resistor R3 is connected to triode Q1, the grid of PMOS tube T1
Pole G is connected between second resistance R2 and 3rd resistor R3；The emitter E ground connection of triode Q1, the base stage B of triode Q1 and the
One end connection of four resistance R4, the control signal of the other end of the 4th resistance R4 as noise reduction switch circuit, compared with voltage
The output terminal connection of device.
The operation principle of the present invention is as follows：In the dormitory of campus, noise transducer can gather ambient noise in real time, and defeated
Go out voltage signal to voltage comparator, the voltage signal of output is sized to the size of reflection noise, when ambient noise is larger, makes
Noise transducer output voltage signal be more than reference voltage source voltage when, the homophase input voltage of voltage comparator is more than
Reverse inter-input-ing voltage, at this time, voltage comparator export high level to the control signal of noise reduction switch circuit, at this time noise reduction switch
Circuit turn-on, active noise reduction equipment is started to work, to realize the noise reduction in the dormitory of campus；When ambient noise is smaller, noise senses
When the voltage signal of device output is less than the voltage of reference voltage source, voltage comparator homophase input voltage is less than anti-phase input electricity
Pressure, voltage comparator export low level to the control signal of noise reduction switch circuit, and noise reduction switch circuit cut-off at this time, actively drops
Equipment of making an uproar is stopped, and therefore, by noise detection module, according to the size of noise, can control the work of active noise reduction equipment
Make or stop, and then can not only realize and active noise reduction is realized under larger noise circumstance, also can be in the less environment ShiShimonoseki of noise
Active noise reduction equipment is closed to save electric power resource.
During active noise reduction, the ambient noise in the dormitory of campus is gathered by sound pick-up, phase inverter is sent into and carries out instead
Phase, signal of the generation with noise same frequency with amplitude antiphase, then by loudspeaker, send and the same amplitude of ambient noise same frequency
The sound wave of antiphase offsets ambient noise, so as to reach reduction influence of noise, the passive of sound insulation door and window is closed compared to tradition
Noise reduction mode, has that cost is low, effect is good, is conducive to the advantage of air circulation.
Claims (4)
- A kind of 1. campus dormitory active noise reduction system based on Noise Acquisition, it is characterised in that：Including power supply, noise reduction switch Circuit, noise detection module and active noise reduction module；The power input of the noise reduction switch circuit is connected with power supply, power output end and the active of noise reduction switch circuit Noise reduction module connects；The noise detection module includes noise transducer, reference voltage source and voltage comparator, and the noise passes Sensor is arranged in dormitory, and the output terminal of noise transducer and the in-phase input end of voltage comparator connect, voltage comparator Inverting input is connected with reference voltage source, and the output terminal of voltage comparator is connected with the control signal of noise reduction switch circuit.
- A kind of 2. campus dormitory active noise reduction system based on Noise Acquisition according to claim 1, it is characterised in that：Institute The power module stated also directly is connected with noise detection module, for powering for noise detection module.
- A kind of 3. campus dormitory active noise reduction system based on Noise Acquisition 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 Noise Acquisition according to claim 1, it is characterised in that：Institute The noise reduction switch circuit stated includes PMOS tube T1 and triode Q1, the power supply of the source S of PMOS tube T1 as noise reduction switch circuit Input terminal, is connected to power supply；Power output end of the drain D of PMOS tube T1 as noise reduction switch circuit, is connected to actively Noise reduction module, is parallel with first resistor R1 between the source S and drain D of PMOS tube T1, the source S of PMOS tube T1 also passes sequentially through Second resistance R2 and 3rd resistor R3 is connected to the collector C of triode Q1, and the grid G of PMOS tube T1 is connected to second resistance R2 Between 3rd resistor R3；The emitter E ground connection of triode Q1, the base stage B of triode Q1 are connected with one end of the 4th resistance R4, Control signal of the other end of 4th resistance R4 as noise reduction switch circuit, is connected with the output terminal of voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260950.8A CN107993645A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on Noise Acquisition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260950.8A CN107993645A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on Noise Acquisition |
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| Publication Number | Publication Date |
|---|---|
| CN107993645A true CN107993645A (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711260950.8A Withdrawn CN107993645A (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on Noise Acquisition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110570539A (en) * | 2019-09-05 | 2019-12-13 | 成都亿盟恒信科技有限公司 | Vehicle-mounted intelligent terminal with identity card identification function |
| TWI813584B (en) * | 2018-08-31 | 2023-09-01 | 逸陞有限公司 | Indoor active noise reduction system |
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| 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 |
| 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 |
| CN203134364U (en) * | 2012-10-29 | 2013-08-14 | 郑力铭 | Door and window active noise reduction device |
| CN205048699U (en) * | 2015-10-19 | 2016-02-24 | 珠海格力电器股份有限公司 | Noise reduction system, Electronic expansion valve and air conditioner |
| 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 |
| CN106251878A (en) * | 2016-08-26 | 2016-12-21 | 彭胜 | Meeting affairs voice recording device |
| CN106356050A (en) * | 2016-08-27 | 2017-01-25 | 董涛 | Automatic noise elimination method in teaching scene |
| 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 |
| CN207676646U (en) * | 2017-12-04 | 2018-07-31 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on Noise Acquisition |
-
2017
- 2017-12-04 CN CN201711260950.8A patent/CN107993645A/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 |
| 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 |
| CN203134364U (en) * | 2012-10-29 | 2013-08-14 | 郑力铭 | Door and window active noise reduction device |
| CN205048699U (en) * | 2015-10-19 | 2016-02-24 | 珠海格力电器股份有限公司 | Noise reduction system, Electronic expansion valve and air conditioner |
| 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 |
| CN106251878A (en) * | 2016-08-26 | 2016-12-21 | 彭胜 | Meeting affairs voice recording device |
| CN106356050A (en) * | 2016-08-27 | 2017-01-25 | 董涛 | Automatic noise elimination method in teaching scene |
| CN106847254A (en) * | 2017-03-17 | 2017-06-13 | 浙江大学 | A kind of locality active noise reduction system |
| CN207676646U (en) * | 2017-12-04 | 2018-07-31 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on Noise Acquisition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI813584B (en) * | 2018-08-31 | 2023-09-01 | 逸陞有限公司 | Indoor active noise reduction system |
| CN110570539A (en) * | 2019-09-05 | 2019-12-13 | 成都亿盟恒信科技有限公司 | Vehicle-mounted intelligent terminal with identity card identification function |
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Application publication date: 20180504 |
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