CN207676638U - A kind of campus dormitory active noise reduction system based on time switch - Google Patents
A kind of campus dormitory active noise reduction system based on time switch Download PDFInfo
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- CN207676638U CN207676638U CN201721661316.0U CN201721661316U CN207676638U CN 207676638 U CN207676638 U CN 207676638U CN 201721661316 U CN201721661316 U CN 201721661316U CN 207676638 U CN207676638 U CN 207676638U
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- noise reduction
- noise
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- switch circuit
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Abstract
The campus dormitory active noise reduction system based on time switch that the utility model discloses a kind of, including power supply, time switch, noise reduction switch circuit, noise detection module and active noise reduction module；The power input of the noise reduction switch circuit is connect with power supply, and the power output end of noise reduction switch circuit is connect with active noise reduction module；The power input of the time switch is connect with power supply, and the power output end of time switch is connect with noise detection module；The noise detection module includes noise transducer, reference voltage source and voltage comparator, the noise transducer is set in dormitory, the output end of noise transducer and the in-phase input end of voltage comparator connect, the inverting input of voltage comparator is connect with reference voltage source, and the output end of voltage comparator is connect with the control signal of noise reduction switch circuit.The utility model provides a kind of campus dormitory active noise reduction system based on time switch, has both reduced the influence that ambient noise larger in the dormitory of campus generates student, also avoids unnecessary electric power resource waste.
Description
Technical field
The utility model is related to indoor noise reductions, more particularly to a kind of campus dormitory active noise reduction system based on time switch
System.
Background technology
In recent years, with the continuous expansion of China Higher education's dimension, 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 has the campus position of some schools more noisy, also, school periphery itself can also form a living area
Domain, noise is inevasible, and in the dormitory of campus, noise may generate harmful effect to the campus life of student, make
The unhealthy emotions such as the raw agitation of production, anxiety；Especially during sleep, if influenced by noise, it 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 be 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 is not obvious, and is used
Such noise reduction mode, generally requires to close the doors and windows, and is unfavorable for air flowing；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, in some periods（Such as it is white
Its student goes to class hour on classroom）Noise reduction in the dormitory of campus can cause prodigious electric power resource to waste, smaller in noise, to learning
When life does not influence, it is also unnecessary to carry out noise reduction, therefore, to noise reduction condition control extremely important.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of campus dormitory based on time switch
Active noise reduction system can periodically connect the power supply of noise detection module, when detecting that noise is larger, control noise reduction in time and open
Circuit turn-on is closed, and then active noise reduction module is started to work, and noise is offset in a manner of active noise reduction, has both reduced campus dormitory
The influence that interior larger ambient noise generates student also avoids unnecessary electric power resource waste.
The purpose of this utility model is achieved through the following technical solutions：A kind of campus dormitory based on time switch
Active noise reduction system, including power supply, time switch, noise reduction switch circuit, noise detection module and active noise reduction module；
The power input of the noise reduction switch circuit is connect with power supply, the power output end of noise reduction switch circuit with
Active noise reduction module connects；The power input of the time switch is connect with power supply, the power output end of time switch
It is connect with noise detection module；
The noise detection module includes noise transducer, reference voltage source and voltage comparator, the noise transducer
It is set in dormitory, the output end of noise transducer and the in-phase input end of voltage comparator connect, the reverse phase of voltage comparator
Input terminal is connect with reference voltage source, and the output end of voltage comparator is connect with the control signal of noise reduction switch circuit.
The active noise reduction module includes the sound pick-up, phase inverter and loud speaker being set in dormitory, the sound pick-up
Output end is connect with phase inverter, and the output end of phase inverter is connect with loud speaker.
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；Output end of the drain D of PMOS tube T1 as noise reduction switch circuit, connection
To active noise reduction module, be parallel with first resistor R1 between the source S and drain D of PMOS tube T1, the source S of PMOS tube T1 also according to
The secondary collector C that triode Q1 is connected to by second resistance R2 and 3rd resistor R3, the grid G of PMOS tube T1 are connected to second
Between resistance R2 and 3rd resistor R3；The emitter E of triode Q1 is grounded, and the one of the base stage B and the 4th resistance R4 of triode Q1
End connection, the control signal of the other end of the 4th resistance R4 as noise reduction switch circuit, the output end company with voltage comparator
It connects.
The utility model has the beneficial effects that：In the utility model, it is provided between power supply and noise detection module
Time switch enables to power supply timing to be powered for noise detection module so that noise detection module is according to noise
Testing result controls noise reduction switch circuit, to control active noise reduction modular power source break-make；Based on time switch, keep away
Exempt from the unnecessary period（Student's school session）Noise measuring to campus dormitory and active noise reduction；Based on noise measuring
It is smaller to the unnecessary noise reduction of indoor environment progress to avoid ambient noise for module；To which the utility model both reduces campus
The influence that larger ambient noise generates student in dormitory also avoids unnecessary electric power resource waste；Active noise reduction mould
In block, the ambient noise in the dormitory of campus is acquired by sound pick-up, phase inverter is sent into and carries out reverse phase, generate same with noise same frequency
The signal of amplitude antiphase, then by loud speaker sends out and offsets ring with the sound wave of amplitude antiphase with ambient noise same frequency
Border noise, to achieve the effect that reduce influence of noise, compared to tradition close sound insulation door and window passive noise reduction mode, have at
This is low, effect is good, is conducive to the advantage of air circulation.
Description of the drawings
Fig. 1 is the principles of the present invention block diagram；
Fig. 2 is the principle schematic of noise reduction switch circuit.
Specific implementation mode
The technical solution of the utility model, but the scope of protection of the utility model are described in further detail below in conjunction with the accompanying drawings
It is not limited to as described below.
As shown in Figure 1, a kind of campus dormitory active noise reduction system based on time switch, including power supply, periodically open
Pass, noise reduction switch circuit, noise detection module and active noise reduction module；
The power input of the noise reduction switch circuit is connect with power supply, the power output end of noise reduction switch circuit with
Active noise reduction module connects；The power input of the time switch is connect with power supply, the power output end of time switch
It is connect with noise detection module；
The noise detection module includes noise transducer, reference voltage source and voltage comparator, the noise transducer
It is set in dormitory, the output end of noise transducer and the in-phase input end of voltage comparator connect, the reverse phase of voltage comparator
Input terminal is connect with reference voltage source, and the output end of voltage comparator is connect with the control signal of noise reduction switch circuit.
The active noise reduction module includes the sound pick-up, phase inverter and loud speaker being set in dormitory, the sound pick-up
Output end is connect with phase inverter, and the output end of phase inverter is connect with loud speaker.
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, it is connected to power supply；The drain D of PMOS tube T1 is defeated as noise reduction switch circuit
Outlet is connected to active noise reduction module, first resistor R1 is parallel between the source S and drain D of PMOS tube T1, PMOS tube T1's
Source S also passes sequentially through the collector C that second resistance R2 and 3rd resistor R3 is connected to triode Q1, the grid G of PMOS tube T1
It is connected between second resistance R2 and 3rd resistor R3；The emitter E of triode Q1 is grounded, the base stage B of triode Q1 and the 4th
One end of resistance R4 connects, the control signal of the other end of the 4th resistance R4 as noise reduction switch circuit, with voltage comparator
Output end connection.
The principles of the present invention are as follows：It is fixed to be provided in the dormitory of campus, between power supply and noise detection module
Shi Kaiguan enables to power supply timing to be powered for noise detection module so that noise detection module is examined according to noise
It surveys as a result, controlling noise reduction switch circuit, to control active noise reduction modular power source break-make；Based on time switch, avoid
In unnecessary period（Student's school session）Noise measuring to campus dormitory and active noise reduction；Based on noise measuring mould
Block, avoids that ambient noise is smaller to carry out unnecessary noise reduction to indoor environment, specifically：Time switch connects noise measuring mould
After the power supply of block, noise transducer can acquire ambient noise in real time, and output voltage signal is to voltage comparator, the electricity of output
Pressure signal magnitude can reflect the size of noise, when ambient noise is larger so that the voltage signal of noise transducer output is more than
When the voltage of reference voltage source, the homophase input voltage of voltage comparator is more than reverse inter-input-ing voltage, at this point, voltage comparator is defeated
Going out high level to the control signal of noise reduction switch circuit, noise reduction switch circuit turn-on, active noise reduction equipment are started to work at this time,
To realize the noise reduction in the dormitory of campus；When ambient noise is smaller, the voltage signal of noise transducer output is less than reference voltage source
Voltage when, voltage comparator homophase input voltage be less than reverse inter-input-ing voltage, voltage comparator output low level opened to noise reduction
The control signal on powered-down road, the cut-off of noise reduction switch circuit, active noise reduction equipment are stopped, therefore, are examined by noise at this time
Module is surveyed, the work or stopping of active noise reduction equipment can be controlled according to the size of noise, and then can not only realize larger make an uproar
Active noise reduction is realized under acoustic environment, and active noise reduction equipment can be also closed under the smaller environment of noise to save electric power resource.
During active noise reduction, the ambient noise in the dormitory of campus is acquired by sound pick-up, phase inverter is sent into and carries out reverse phase, generate and make an uproar
Sound same frequency then by loud speaker, sends out the sound with amplitude antiphase with ambient noise same frequency with the signal of amplitude antiphase
Wave offsets ambient noise, to reach reduction influence of noise, compared to the passive noise reduction mode that tradition closes sound insulation door and window, tool
Have that at low cost, effect is good, is conducive to the advantage of air circulation.
Claims (3)
1. a kind of campus dormitory active noise reduction system based on time switch, it is characterised in that：Including power supply, periodically open
Pass, noise reduction switch circuit, noise detection module and active noise reduction module；
The power input of the noise reduction switch circuit is connect with power supply, power output end and the active of noise reduction switch circuit
Noise reduction module connects；The power input of the time switch is connect with power supply, the power output end of time switch with make an uproar
Sound detection module connects；
The noise detection module includes noise transducer, reference voltage source and voltage comparator, the noise transducer setting
In in dormitory, the output end of noise transducer and the in-phase input end of voltage comparator connect, the anti-phase input of voltage comparator
End is connect with reference voltage source, and the output end of voltage comparator is connect with the control signal of noise reduction switch circuit.
2. a kind of campus dormitory active noise reduction system based on time switch according to claim 1, it is characterised in that：Institute
It includes the sound pick-up, phase inverter and loud speaker being set in dormitory to state active noise reduction module, the output end of the sound pick-up with it is anti-
Phase device connects, and the output end of phase inverter is connect with loud speaker.
3. a kind of campus dormitory active noise reduction system based on time switch 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；Output end of the drain D of PMOS tube T1 as noise reduction switch circuit, is connected to active 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 and
Between three resistance R3；The emitter E of triode Q1 is grounded, and the base stage B of triode Q1 is connect with one end of the 4th resistance R4, and the 4th
Control signal of the other end of resistance R4 as noise reduction switch circuit, connect with the output end of voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721661316.0U CN207676638U (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on time switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721661316.0U CN207676638U (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on time switch |
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| Publication Number | Publication Date |
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| CN207676638U true CN207676638U (en) | 2018-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721661316.0U Expired - Fee Related CN207676638U (en) | 2017-12-04 | 2017-12-04 | A kind of campus dormitory active noise reduction system based on time switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107993644A (en) * | 2017-12-04 | 2018-05-04 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on time switch |
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2017
- 2017-12-04 CN CN201721661316.0U patent/CN207676638U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107993644A (en) * | 2017-12-04 | 2018-05-04 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system based on time switch |
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| Date | Code | Title | Description |
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| 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: 20180731 Termination date: 20191204 |