CN204010448U - A kind of instruments used for education of demonstrating Active Noise Control - Google Patents
A kind of instruments used for education of demonstrating Active Noise Control Download PDFInfo
- Publication number
- CN204010448U CN204010448U CN201420246605.4U CN201420246605U CN204010448U CN 204010448 U CN204010448 U CN 204010448U CN 201420246605 U CN201420246605 U CN 201420246605U CN 204010448 U CN204010448 U CN 204010448U
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- CN
- China
- Prior art keywords
- power amplifier
- sound wave
- cpu module
- acoustic pressure
- loudspeaker
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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.)
- Expired - Fee Related
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of instruments used for education of demonstrating Active Noise Control, comprise: tunable signal generator, power amplifier, loudspeaker, condenser microphone, CPU module, it is characterized in that: the sound wave that noise source is sent, receive sound wave by condenser microphone, and convert acoustic pressure to voltage, pass to CPU module, after CPU module analytic intensity and phase place, by after signal inversion, pass to power amplifier, power amplifier drives loudspeaker, produce the sound wave acoustic pressure equal and opposite in direction that sends with noise source and the acoustic pressure of single spin-echo, two acoustic pressures are offset each other.
Description
Technical field
The utility model belongs to physics educational apparatus field, is specifically related to a kind of instruments used for education of demonstrating Active Noise Control.
Background technology
In recent years, neighbourhood noise has become a kind of important public hazards, is one of current global Environmental Pollution.Noise effect people's physical and mental health, damage hearing and relevant system, cardiovascular system, impact sleep, reduces work efficiency, the serious security incident that even causes.The improvement of noise pollution has become the important content of home and abroad environment protection work, and wherein Active Noise Control is one of wherein common technology.
At home in the daily physical teaching course of colleges and universities, while relating to undulatory theory, usually using Active Noise Control application in productive life as undulatory theory, to deepen the understanding of student for knowwhy.But when serving as a teacher oral explanation Active Noise Control, student is this abstract saying indigestion often, therefore needs a kind of simple and practical demonstration instrument, give student with impression intuitively.
The utility model proposes for above-mentioned problem, and a kind of instruments used for education of demonstrating Active Noise Control are provided, and convenient demonstration Active Noise Control phenomenon.
Utility model content
In wave theory, amplitude equates, the ripple of single spin-echo superposes at some place, space, interferes each other, and closing amplitude is 0.The utility model utilizes principle of interference, and a kind of teaching demonstration instrument of demonstrating Active Noise Control is provided, and comprising: tunable signal generator, power amplifier, loudspeaker, condenser microphone, CPU module etc.It is characterized in that: the sound wave that noise source is sent, after condenser microphone receives sound wave, convert the sound pressure signal receiving to voltage signal by sound-electric conversion, pass to CPU module, after CPU module analytic intensity and phase place, by signal inversion, pass to power amplifier, power amplifier drives loudspeaker, produces the sound wave acoustic pressure equal and opposite in direction that sends with noise source and the sound wave of single spin-echo, two acoustic pressures are offset each other, fall low noise object thereby reach.
Brief description of the drawings
Fig. 1 is the schematic diagram of the instruments used for education of demonstration Active Noise Control.
In above-mentioned figure, 1 represents noise source, and 2 represent active silencer, and 3 represent tunable signal generator, 4 represent power amplifier, and 5 represent loudspeaker, and 6 represent condenser microphone, and 7 represent CPU module, 8 represent power amplifier, and 9 represent loudspeaker, and 10 represent condenser microphone.
Embodiment
, in conjunction with Figure of description 1, embodiment of the present utility model is described now.Fig. 1 intermediate power amplifier 4 and 8 all adopts dual power supply operational amplifier LM386, and loudspeaker 5 and 9 adopts 8R3W loudspeaker, and condenser microphone 6 and 10 adopts electret capcitor microphone, and central processing module 7 adopts ARM control core MK60DN512.
1. in classroom, noise source 1 is placed in one end, near placement active silencer 2, and the two line right side area is the students that participates in experiment.
2. in noise source 1, tunable signal generator 3 sends the signal of a certain frequency, after power amplifier 4 amplifies, passes to loudspeaker 5, and loudspeaker 5 is to noise source 1 and active silencer 2 line direction transmitting sound waves.
3. in active silencer 2, condenser microphone 6 receives the sound wave that noise source 1 launches, and converts the sound pressure signal receiving to voltage signal by sound-electric conversion chip AD/DA audio chip AIC23, passes to CPU module 7.
4. CPU module 7 analysis obtains after the intensity and phase place of acoustic pressure, by signal inversion, and passes to power amplifier 8, and power amplifier 8 drives loudspeaker 9, produces the sound wave acoustic pressure equal and opposite in direction that sends with noise source and the acoustic pressure of single spin-echo.
5. condenser microphone 10 is placed in the middle of the student who participates in experiment, detection sound wave intensity, and feed back to CPU module 7, CPU module 7 is finely tuned the signal of passing to power amplifier 8, to realize better soundproof effect.
6. two sound waves that noise source 1 and active silencer 2 send are offset each other, fall low noise object thereby reach, and the students' union that participates in experiment feels the obvious decline of noise intensity.
Claims (1)
1. demonstrate the instruments used for education of Active Noise Control for one kind, comprise: tunable signal generator, power amplifier, loudspeaker, condenser microphone, CPU module, it is characterized in that: the sound wave that noise source is sent, receive sound wave by condenser microphone, and convert acoustic pressure to voltage, pass to CPU module, after CPU module analytic intensity and phase place, by after signal inversion, pass to power amplifier, power amplifier drives loudspeaker, produce the sound wave acoustic pressure equal and opposite in direction that sends with noise source and the acoustic pressure of single spin-echo, two acoustic pressures are offset each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246605.4U CN204010448U (en) | 2014-05-13 | 2014-05-13 | A kind of instruments used for education of demonstrating Active Noise Control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246605.4U CN204010448U (en) | 2014-05-13 | 2014-05-13 | A kind of instruments used for education of demonstrating Active Noise Control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204010448U true CN204010448U (en) | 2014-12-10 |
Family
ID=52050414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420246605.4U Expired - Fee Related CN204010448U (en) | 2014-05-13 | 2014-05-13 | A kind of instruments used for education of demonstrating Active Noise Control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204010448U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384585A (en) * | 2016-10-28 | 2017-02-08 | 芜湖市吉安汽车电子销售有限公司 | Active noise eliminating device based on on-vehicle DA manual control system |
-
2014
- 2014-05-13 CN CN201420246605.4U patent/CN204010448U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384585A (en) * | 2016-10-28 | 2017-02-08 | 芜湖市吉安汽车电子销售有限公司 | Active noise eliminating device based on on-vehicle DA manual control system |
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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 |
Granted publication date: 20141210 Termination date: 20150513 |
|
| EXPY | Termination of patent right or utility model |