CN101727895B - Noise reduction device, computer and noise reduction method - Google Patents
Noise reduction device, computer and noise reduction method Download PDFInfo
- Publication number
- CN101727895B CN101727895B CN2008102243746A CN200810224374A CN101727895B CN 101727895 B CN101727895 B CN 101727895B CN 2008102243746 A CN2008102243746 A CN 2008102243746A CN 200810224374 A CN200810224374 A CN 200810224374A CN 101727895 B CN101727895 B CN 101727895B
- Authority
- CN
- China
- Prior art keywords
- noise
- fan
- sound
- acoustic wave
- parameter
- Prior art date
- 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.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention provides a noise reduction device, a computer and a noise reduction method. The noise reduction device is used for noise reduction of a fan of electronic equipment, and comprises a first acquisition module, a second acquisition module, a generation module and a sound generator, wherein the first acquisition module is used for acquiring equipment operation parameters; the second acquisition module is used for acquiring first acoustic parameters of first noise currently generated by the fan according to the equipment operation parameters; the generation module is used for generating second acoustic parameters according to the first acoustic parameters; and the sound generator is used for producing second sound with the second acoustic parameters, fourth sound formed by the second sound through second distance transmission, and third sound formed by the first noise through first distance transmission, wherein the amplitude of fifth sound formed by overlapping in a preset position area is less than that of the first noise. The noise reduction device, the computer and the noise reduction method can effectively reduce the noise generated by the fan during the operation.
Description
Technical field
The present invention relates to the noise reduction field, relate in particular to a kind of denoising device, computing machine and noise-reduction method.
Background technology
When computing machine turned round for a long time, parts such as CPU (Center Processor Unit, CPU) and video card can produce higher temperature; Influence the performance of computing machine; The main fan that adopts carries out active heat removal in the computer system at present, with the long-time stable work of assurance computing machine, yet; Can produce noise during the fan rotation, bring puzzlement for user's operate as normal.
The method that has active noise reduction at present in the prior art is to reduce the noise of fan; Be specially: the original noise that the devices that quiet down such as employing microphone produce when collecting fan running; And through sound generator send with said original noise can cancel out each other one control noise; Reducing fan noise, the frequency of said control noise and said original noise is identical, phase place is opposite, and amplitude is close.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem:
Because the space in notebook or the general computer is limited; The quiet down close together of device and sound generator such as microphone when collecting the noise of fan, may also collect the control noise to enter simultaneously; The control noise produces fan noise and disturbs, and influences the accuracy of noise reduction; In addition, the interpolation of the devices that quiet down such as this microphone also can increase the cost and the circuit complexity of denoising device.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide a kind of denoising device, computing machine and noise-reduction method, the noise that produces in the time of can effectively reducing fan running.
For achieving the above object, the embodiment of the invention provides a kind of denoising device, is used for the noise reduction of the fan of electronic equipment, comprising:
First acquisition module is used to obtain the equipment operation parameter;
Second acquisition module is used for obtaining first acoustic wave parameter of first noise of the current generation of said fan according to said equipment operation parameter;
Generation module is used for according to said first acoustic wave parameter, generates second sound wave parameter;
Sound generator; Be used to produce second sound with said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
Said equipment operation parameter is the current rotating speed of said fan;
Said denoising device also comprises:
First memory module is used to store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of said current rotating speed from said first memory module.
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said denoising device also comprises:
Second memory module is used to store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module.
Said second acquisition module comprises:
Acquiring unit is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Extraction unit, the noise amplitude that is used for extracting the current generation of said fan surpasses the noise of predetermined threshold, as said first noise, and obtains first acoustic wave parameter of said first noise.
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
The embodiment of the invention also provides a kind of computing machine, comprises fan and denoising device, and said denoising device comprises:
First acquisition module is used to obtain the equipment operation parameter;
Second acquisition module is used for obtaining first acoustic wave parameter of first noise of the current generation of said fan according to said equipment operation parameter;
Generation module is used for according to said first acoustic wave parameter, generates second sound wave parameter;
Sound generator; Be used to produce second sound with said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
Said equipment operation parameter is the current rotating speed of said fan;
Said denoising device also comprises:
First memory module is used to store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of said current rotating speed from said first memory module.
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said denoising device also comprises:
Second memory module is used to store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module.
Said second acquisition module comprises:
Acquiring unit is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Extraction unit, the noise amplitude that is used for extracting the current generation of said fan surpasses the noise of predetermined threshold, as said first noise, and obtains first acoustic wave parameter of said first noise.
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
The embodiment of the invention also provides a kind of noise-reduction method, may further comprise the steps:
Obtain the equipment operation parameter;
According to said equipment operation parameter, obtain first acoustic wave parameter of first noise of the current generation of said fan;
According to said first acoustic wave parameter, generate second sound wave parameter;
Generation has second sound of said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
Said equipment operation parameter is the current rotating speed of said fan;
Said according to said equipment operation parameter, first acoustic wave parameter that obtains first noise of the current generation of said fan also comprises before:
Store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said according to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
Corresponding relation according to first acoustic wave parameter of the rotating speed of said fan and said first noise obtains first acoustic wave parameter with corresponding said first noise of said current rotating speed.
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said according to said equipment operation parameter, first acoustic wave parameter that obtains first noise of the current generation of said fan also comprises before:
Store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said according to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
Corresponding relation according to first acoustic wave parameter of the temperature of said fan effective object and said first noise obtains first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object.
According to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
According to said equipment operation parameter, obtain the noise parameter of the noise of the current generation of said fan;
Extract the noise that amplitude in the noise of the current generation of said fan surpasses predetermined threshold,, and obtain first acoustic wave parameter of said first noise as said first noise.
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
Embodiments of the invention have following beneficial effect:
The correlation parameter of first noise that produces when storing fan running in advance; When fan running; Directly call said correlation parameter; Generate second sound, the amplitude of the noise that said second sound and said first noise stack back forms is less than the amplitude of said first noise, thereby can reduce the noise of fan; Owing to do not adopt the device that quiets down, therefore, improved the accuracy of noise reduction, and reduced the cost and the circuit complexity of denoising device.
Description of drawings
Fig. 1 is the structural representation of the denoising device of the embodiment of the invention;
Fig. 2 is another structural representation of the denoising device of the embodiment of the invention;
Fig. 3 is the another structural representation of the denoising device of the embodiment of the invention;
Fig. 4 is the structural representation of the computing machine of the embodiment of the invention;
Fig. 5 is another structural representation of the computing machine of the embodiment of the invention;
Fig. 6 is the another structural representation of the computing machine of the embodiment of the invention;
Fig. 7 is the noise-reduction method schematic flow sheet of the embodiment of the invention;
Fig. 8 is the experimental result synoptic diagram of the noise-reduction method of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of denoising device, computing machine and noise-reduction method; The correlation parameter of the noise that produces when storing fan running in advance when carrying out noise reduction process, directly calls said correlation parameter; Generate second sound identical with the fan noise frequency, that phase place is opposite; When the opposite two kinds of sound waves of, phase place identical owing to frequency superpose, the overlapping part of can cancelling out each other, therefore; Said second sound can to a certain degree with the counteracting that superposes of first noise, thereby reach the purpose that reduces fan noise.
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.
Be illustrated in figure 1 as the denoising device structural representation of the embodiment of the invention, said denoising device is used for the noise reduction of the fan of electronic equipment, and said denoising device comprises:
First acoustic wave parameter of said first noise can comprise: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
Therefore; Final said second sound that produces; Identical with the frequency of said first noise, phase place is opposite, the amplitude of said second sound is greater than zero and less than two times of said first amplitude, with the 3rd sound that guarantees that first noise forms through second distance transmission back; With the fourth sound sound that second sound forms through second distance transmission back, the amplitude of the fifth sound sound that forms in presumptive area stack back is less than the amplitude of first noise.
The said equipment operating parameters can be the current rotating speed of said fan, is illustrated in figure 2 as another structural representation of the denoising device of the embodiment of the invention, and said denoising device also comprises:
At this moment, above-mentioned second acquisition module 12 specifically is used for from said first memory module 15, obtains first acoustic wave parameter with corresponding said first noise of current rotating speed of said fan.
Said fans is the fan with one or more fixed rotating speeds; The rotating speed that is said fan is not at random, and said rotating speed is controlled, for example; The rotating speed of fan can be along with the rising of temperature, and is controlled at respectively on 3000 rev/mins, 4000 rev/mins or 5000 rev/mins of three class.
Can adopt several different methods to obtain the rotating speed of fan; For example; Utilize the rotating speed of the built-in velocity gauge of fan (Tachometer) detecting fan, perhaps utilize the rotating speed of detecting fan such as external sensor etc., whether the advantage of the rotating speed of above-mentioned detecting real-time fan is to damage by the real-time detection fan.
The corresponding relation of first acoustic wave parameter of first noise that fan produces under the rotating speed of said fans and this rotating speed, can store with a form in, as shown in the table is a specific embodiment of this form:
Certainly, also can be stored as other forms, for example, can also be stored as a function calculation formula, with the corresponding relation of the function of first acoustic wave parameter of representing said first noise and rotation speed of the fan, for example: S
1(x, y, z)=f (rpm), wherein, S
1Be first noise, x, y, z are first acoustic wave parameter of first noise, and rpm is the rotating speed of fan, when getting access to the current rotating speed of said fan, according to said function calculation formula, then can obtain first acoustic wave parameter of said first noise.
The corresponding relation of first acoustic wave parameter of first noise that fan produces under the rotating speed of said fans and this rotating speed; All be to measure gained through particular instrument in advance; And in storage and the denoising device, or in the electronic equipment at storage and denoising device place, for example can collect and analyze first noise that fan produces under specific rotation speeds through microphone in advance; First acoustic wave parameter of first noise that analysis obtains (frequency, amplitude or phase place etc.); Certainly, said first acoustic wave parameter also can comprise other acoustic wave parameters, for example wavelength, cycle etc.
Concrete, first acoustic wave parameter of first noise that fan produces can be according to following method measurements and calculations gained:
The acquisition methods of the frequency of said first noise is:
First noise that fan produces in operation process is that the noise group by various different frequencies lumps together; In actual noise reduction process; And can not all carry out noise reduction to the noise of each frequency; Therefore; Generally; Be to select the noise of several kinds of bigger critical frequencies of first noise effect is handled, the noise that in the embodiment of the invention is several kinds of crucial predominant frequencies producing with fan is as first noise, and said crucial predominant frequency comprises a kind of in the following several kinds of frequencies or any several kinds: fan fundamental frequency (Fan fundmentalfrequency), blade passing frequency (Blade pass frequency), pulsed frequency (Pulse frequency), magnetic pole frequency (Poles frequency) and inversion frequency (Switching frequency).
The crucial predominant frequency of said fans can be by the revolution speed calculating gained of fan, and is concrete, can calculate the crucial predominant frequency of fan through following formula:
Fan fundamental frequency=rotation speed of the fan/60;
Blade passing frequency=rotation speed of the fan/60 * number of blade;
Magnetic pole frequency=rotation speed of the fan/60 * number of magnetic poles;
Pulsed frequency=rotation speed of the fan/60 * number of magnetic poles/2;
When carrying out noise reduction process; Can be through obtaining the frequency noise that amplitude is bigger in the above-mentioned crucial predominant frequency noise (noise that surpasses predetermined threshold amplitude) as first noise; And said first noise carried out noise reduction process; Said predetermined threshold can be provided with as the case may be, for example can be set to 10dB by predetermined threshold, and the frequency noise that promptly amplitude is surpassed 10dB carries out noise reduction process.Therefore, the follow-up frequency noise that balances out is the noise of comparatively sharp-pointed frequency, and the noise that finally makes fan produce is comparatively level and smooth, has improved the noise qualities of fan.
Can adopt phase analyzer to calculate the phase place of said first noise; Concrete; Can adopt following method: utilize Fourier transform (FFT) noise signal of time domain (TIME DOMAIN) to be converted to the noise signal of frequency field; According to the noise signal of said frequency field, can calculate the phase place of said first noise.
The amplitude of first noise is then measured gained by measurement mechanisms such as microphone or amplitude sensors.
The said equipment operating parameters can also be the Current Temperatures of fan effective object, is illustrated in figure 3 as the another structural representation of the denoising device of the embodiment of the invention, and said denoising device also comprises:
Said second acquisition module 12 specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module 16.
The corresponding relation of the temperature of the fan effective object of above-mentioned storage and first acoustic wave parameter of said first noise; All be to measure gained through particular instrument in advance; And in storage and the denoising device; Or in the electronic equipment at storage and denoising device place, said fan effective object is the parts of the evolution of heat, and said fan promptly is to establish for the temperature that reduces this fan effective object.
At this moment, the rotating speed of said fan is fixing rotating speed in that specified temp is interval, and for example the temperature of fan effective object is positioned at 40 degree when following; The rotating speed of fan is 3000 rev/mins, and fan effective object temperature is when 40 spend between～50 degree, and the rotating speed of fan is 4000 rev/mins; Fan effective object temperature is positioned at 60 degree when above, and fan commentariess on classics degree is 5000 rev/mins, promptly in the specified temp interval; The rotating speed of fan is fixed; The spectrum distribution of first noise that produces when being fan running is fixing also the time, then can be through experiment measuring in advance, obtain the corresponding relation of first acoustic wave parameter of temperature and first noise of said fan effective object.
As stated, the noise that fan produces in operation process is that the noise group by various different frequencies lumps together, in actual noise reduction process; And can not all carry out noise reduction to each noise; Therefore, generally, be select amplitude bigger noise handle; As shown in Figures 2 and 3, above-mentioned second acquisition module 12 comprises:
Acquiring unit 121 is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Because sound in communication process, may receive Effect of Environmental, produce decay to a certain degree; Perhaps phase place changes, therefore, and when said first noise and said second sound propagate into the position of both stacks; Its acoustic wave parameter (phase place and amplitude etc.) may produce certain variation; Make two kinds of ripples mutual superposition just, therefore, the position relation between said sound generator 14 and the said fan is extremely important.Preferably, can sound generator 14 be set directly on the said fan, under the transmission of the sound that two kinds of devices send through same distance, equivalent environment, the variation of acoustic wave parameter is also consistent, and therefore, counteracting can superpose mutually.Certainly, also can sound generator 14 be placed on other positions, like the next door of fan, air outlet place etc.; Under this kind situation; Then need the constantly position of experiment adjustment sound generator 14,, reach the purpose that two kinds of phases of wave superpose mutually and offset perhaps through the phase place data of adjustment first noise.
The denoising device that provides through the foregoing description; Store the correlation parameter information of the noise of fan in advance, therefore, the devices that quiet down such as microphone need not be installed in denoising device; Reduced the cost of denoising device; And generally, said stored parameters information is that accuracy is higher through experiment measuring gained repeatedly.
Be illustrated in figure 4 as the structural representation of the computing machine of the embodiment of the invention, the denoising device 10 of the noise that said computing machine produced when comprising fan 20 and being used to reduce said fan running, said denoising device 10 comprises:
First acoustic wave parameter of said first noise can comprise: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
Therefore; Final said second sound that produces; Identical with the frequency of said first noise, phase place is opposite, the amplitude of said second sound is greater than zero and less than two times of said first amplitude, makes the fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
The said equipment operating parameters can be the current rotating speed of said fan, is illustrated in figure 5 as another structural representation of the computing machine of the embodiment of the invention, and above-mentioned denoising device 10 also comprises:
At this moment, above-mentioned second acquisition module 12 specifically is used for from said first memory module 15, obtains first acoustic wave parameter with corresponding said first noise of current rotating speed of said fan.
Said fans is the fan with one or more fixed rotating speeds, and promptly the rotating speed of said fan is not at random, and said rotating speed is controlled.
Can adopt several different methods to obtain the rotating speed of fan; For example; Utilize the rotating speed of the built-in velocity gauge of fan (Tachometer) detecting fan; Perhaps utilize the rotating speed of detecting such as external sensor fan etc., whether the advantage of the rotating speed of the said fan of above-mentioned detecting real-time is to damage by the real-time detection fan.
The corresponding relation of first acoustic wave parameter of first noise that fan produces under the rotating speed of said fans and this rotating speed, can store with a form in; Also can be stored as a function calculation formula, with the corresponding relation of the function of first acoustic wave parameter of representing said first noise and rotation speed of the fan.
The corresponding relation of first acoustic wave parameter of first noise that fan produces under the rotating speed of said fans and this rotating speed; All be to measure gained through particular instrument in advance; And in storage and the denoising device; Or in the electronic equipment at storage and denoising device place, for example can collect and analyze first noise that fan produces under specific rotation speeds through microphone in advance, analyze first acoustic wave parameter of first noise that obtains.
Concrete, gained measured or calculated to first acoustic wave parameter of first noise that fan produces can according to following method:
The acquisition methods of the frequency of said first noise is:
First noise that fan produces in operation process is that the noise group by various different frequencies lumps together; The noise that in the embodiment of the invention is several kinds of crucial predominant frequencies producing with fan is as first noise, and said crucial predominant frequency comprises a kind of in the following several kinds of frequencies or any several kinds: fan fundamental frequency, blade passing frequency, pulsed frequency, magnetic pole frequency and inversion frequency.
The crucial predominant frequency of said fans can be by the revolution speed calculating gained of fan, and is concrete, can calculate the crucial predominant frequency of fan through following formula:
Fan fundamental frequency=rotation speed of the fan/60;
Blade passing frequency=rotation speed of the fan/60 * number of blade;
Magnetic pole frequency=rotation speed of the fan/60 * number of magnetic poles;
Pulsed frequency=rotation speed of the fan/60 * number of magnetic poles/2;
When carrying out noise reduction process; Can be through obtaining the frequency noise that amplitude is bigger in the above-mentioned crucial predominant frequency noise noise of predetermined threshold amplitude (surpass) as first noise, and said first noise is carried out noise reduction process, said predetermined threshold can be provided with as the case may be; Therefore; The follow-up frequency noise that balances out is the noise of comparatively sharp-pointed frequency, and the noise that finally makes fan produce is comparatively level and smooth, has improved the noise qualities of fan.
Can adopt phase analyzer to calculate the phase place of said first noise; Concrete; Can adopt following method: utilize Fourier transform (FFT) noise signal of time domain (TIME DOMAIN) to be converted to the noise signal of frequency field; According to the noise signal of said frequency field, can calculate the phase place of said first noise.
The amplitude of first noise is then measured gained by measurement mechanisms such as microphone or amplitude sensors.
The said equipment operating parameters can also be the Current Temperatures of fan effective object, is illustrated in figure 6 as the another structural representation of the computing machine of the embodiment of the invention, and above-mentioned denoising device 10 also comprises:
Said second acquisition module 12 specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module 16.
The corresponding relation of the temperature of the fan effective object of above-mentioned storage and first audio parameter of said first noise all is to measure gained through particular instrument in advance, and in storage and the denoising device, or in the electronic equipment at storage and denoising device place.
Interval at specified temp, the rotating speed of fan is fixed, and first noise that promptly produces during fan running is fixing also the time, then can be through experiment measuring in advance, obtain the corresponding relation of first acoustic wave parameter of temperature and first noise of said fan effective object.
As stated, the noise that fan produces in operation process is that the noise group by various different frequencies lumps together, in actual noise reduction process; And can not all carry out noise reduction to each noise; Therefore, generally, be select amplitude bigger noise handle; Like Fig. 5 and shown in Figure 6, above-mentioned second acquisition module 12 comprises:
Acquiring unit 121 is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Fan in the foregoing description can be single fan; Also can be a plurality of fans of discharging side by side, because the phase place of first noise is relevant with distance between fan and the denoising device, therefore; Said a plurality of fan is discharging side by side, and is consistent with the distance of denoising device.
Yet; In some cases, may comprise a plurality of fans in the computing machine, for example; The fan of the fan of CPU, the fan of video card, power supply etc.; When in computing machine, having a plurality of different fan, then for each fan, the denoising device that a correspondence all can be set carries out noise reduction process to it.
Under some rotating speed of fan, because the noise that fan produces not is very big, therefore; Need not carry out noise reduction process, only when rotating speed reaches certain grade, carry out noise reduction process again; For example, the rotating speed of said fans is when 3000 rev/mins and 4000 rev/mins, because the noise that produces is very little; Then needn't do noise reduction process, when the rotating speed of fan reaches 5000 rev/mins, just do noise reduction process.
The computing machine that provides through the foregoing description; Store the correlation parameter information of the noise of fan in advance, therefore, the devices that quiet down such as microphone need not be installed in denoising device; Reduced the cost of denoising device; And generally, said stored parameters information is that accuracy is higher through experiment measuring gained repeatedly.
Be illustrated in figure 7 as the schematic flow sheet of the noise-reduction method of the embodiment of the invention, the noise that said method produces when being used to reduce the fan running of electronic equipment said method comprising the steps of:
Step 71 is obtained the equipment operation parameter;
Step 72 according to said equipment operation parameter, is obtained first acoustic wave parameter of first noise of the current generation of said fan;
Step 73 according to said first acoustic wave parameter, generates second sound wave parameter;
Step 74; Generation has second sound of said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
Therefore; Said second sound that finally obtains; Identical with the frequency of said first noise, phase place is opposite, the amplitude of said second sound is greater than zero and less than two times of said first amplitude, with the fourth sound sound that guarantees that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
Said equipment operation parameter can be the current rotating speed of said fan;
Therefore, also comprise before the said step 72:
Store the step of corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
At this moment, said step 72 is specially:
Corresponding relation according to first acoustic wave parameter of the rotating speed of said fan and said first noise obtains first acoustic wave parameter with corresponding said first noise of said current rotating speed.
Said fans is the fan with one or more fixed rotating speeds, and promptly the rotating speed of said fan is not at random, and said rotating speed is controlled.
Said equipment operation parameter can also be the Current Temperatures of fan effective object;
Therefore, also comprise before the said step 72:
Store the step of corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
At this moment, said step 72 is specially:
Corresponding relation according to first acoustic wave parameter of the temperature of said fan effective object and said first noise obtains first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object.
The noise that fan produces in operation process is that the noise group by various different frequencies lumps together; In actual noise reduction process; And can not all carry out noise reduction to each noise, therefore, generally; Be select amplitude bigger noise handle, this moment, the method for step 72 was specially:
According to said equipment operation parameter, obtain the noise parameter of the noise of the current generation of said fan;
Extract the noise that amplitude in the noise of the current generation of said fan surpasses predetermined threshold,, and obtain first acoustic wave parameter of said first noise as said first noise.
The noise-reduction method that provides through the foregoing description; Store the correlation parameter information of the noise of fan in advance, therefore, the devices that quiet down such as microphone need not be installed in denoising device; Reduced the cost of denoising device; And generally, said stored parameters information is that accuracy is higher through experiment measuring gained repeatedly.
Be illustrated in figure 8 as the noise reduction experimental result synoptic diagram of the embodiment of the invention, wherein, solid line waveform is the waveform of first noise; Dotted line waveform is the waveform of second sound, after first noise and second sound are cancelled out each other, the amplitude of the noise of winning is reduced; Thereby reduced The noise; As shown in Figure 8, because the deviation of calculating and the influence of other factors, first noise and second sound can not be offset fully.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (15)
1. denoising device is used for the noise reduction of the fan of electronic equipment, it is characterized in that, comprising:
First acquisition module is used to obtain the equipment operation parameter;
Second acquisition module is used for obtaining first acoustic wave parameter of first noise of the current generation of said fan according to said equipment operation parameter, and wherein, first acoustic wave parameter of said first noise is stored in advance;
Generation module is used for according to said first acoustic wave parameter, generates second sound wave parameter;
Sound generator; Be used to produce second sound with said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
2. denoising device according to claim 1 is characterized in that:
Said equipment operation parameter is the current rotating speed of said fan;
Said denoising device also comprises:
First memory module is used to store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of said current rotating speed from said first memory module.
3. denoising device according to claim 1 is characterized in that:
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said denoising device also comprises:
Second memory module is used to store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module.
4. denoising device according to claim 1 is characterized in that, said second acquisition module comprises:
Acquiring unit is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Extraction unit, the noise amplitude that is used for extracting the current generation of said fan surpasses the noise of predetermined threshold, as said first noise, and obtains first acoustic wave parameter of said first noise.
5. denoising device according to claim 1 is characterized in that:
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
6. a computing machine comprises fan and denoising device, it is characterized in that, said denoising device comprises:
First acquisition module is used to obtain the equipment operation parameter;
Second acquisition module is used for obtaining first acoustic wave parameter of first noise of the current generation of said fan according to said equipment operation parameter, and wherein, first acoustic wave parameter of said first noise is stored in advance;
Generation module is used for according to said first acoustic wave parameter, generates second sound wave parameter;
Sound generator; Be used to produce second sound with said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
7. computing machine according to claim 6 is characterized in that:
Said equipment operation parameter is the current rotating speed of said fan;
Said denoising device also comprises:
First memory module is used to store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of said current rotating speed from said first memory module.
8. computing machine according to claim 6 is characterized in that:
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said denoising device also comprises:
Second memory module is used to store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said second acquisition module specifically is used for obtaining first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object from said second memory module.
9. computing machine according to claim 6 is characterized in that, said second acquisition module comprises:
Acquiring unit is used for obtaining the noise parameter of the noise of the current generation of said fan according to said equipment operation parameter;
Extraction unit, the noise amplitude that is used for extracting the current generation of said fan surpasses the noise of predetermined threshold, as said first noise, and obtains first acoustic wave parameter of said first noise.
10. computing machine according to claim 6 is characterized in that:
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
11. a noise-reduction method is characterized in that, may further comprise the steps:
Obtain the equipment operation parameter;
According to said equipment operation parameter, obtain first acoustic wave parameter of first noise of the current generation of said fan, wherein, first acoustic wave parameter of said first noise is stored in advance;
According to said first acoustic wave parameter, generate second sound wave parameter;
Generation has second sound of said second sound wave parameter; The fourth sound sound that said second sound forms through second distance transmission back; With the 3rd sound that said first noise forms after through first Distance Transmission, the amplitude of the fifth sound sound that forms in stack back, zone, precalculated position is less than the amplitude of said first noise.
12. noise-reduction method according to claim 11 is characterized in that:
Said equipment operation parameter is the current rotating speed of said fan;
Said according to said equipment operation parameter, first acoustic wave parameter that obtains first noise of the current generation of said fan also comprises before:
Store the corresponding relation of first acoustic wave parameter of rotating speed and said first noise of said fan;
Said according to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
Corresponding relation according to first acoustic wave parameter of the rotating speed of said fan and said first noise obtains first acoustic wave parameter with corresponding said first noise of said current rotating speed.
13. noise-reduction method according to claim 11 is characterized in that:
Said equipment operation parameter is the Current Temperatures of fan effective object;
Said according to said equipment operation parameter, first acoustic wave parameter that obtains first noise of the current generation of said fan also comprises before:
Store the corresponding relation of first acoustic wave parameter of temperature and said first noise of said fan effective object;
Said according to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
Corresponding relation according to first acoustic wave parameter of the temperature of said fan effective object and said first noise obtains first acoustic wave parameter with corresponding said first noise of the Current Temperatures of said fan effective object.
14. noise-reduction method according to claim 11 is characterized in that, according to said equipment operation parameter, the method for first acoustic wave parameter of obtaining first noise of the current generation of said fan is:
According to said equipment operation parameter, obtain the noise parameter of the noise of the current generation of said fan;
Extract the noise that amplitude in the noise of the current generation of said fan surpasses predetermined threshold,, and obtain first acoustic wave parameter of said first noise as said first noise.
15. noise-reduction method according to claim 11 is characterized in that:
First acoustic wave parameter of said first noise comprises: the amplitude of the frequency of said first noise, said first noise and the phase place of said first noise;
The frequency of said second sound and said first noise is identical, phase place is opposite, and the amplitude of said second sound is greater than zero and less than two times of said first amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102243746A CN101727895B (en) | 2008-10-20 | 2008-10-20 | Noise reduction device, computer and noise reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102243746A CN101727895B (en) | 2008-10-20 | 2008-10-20 | Noise reduction device, computer and noise reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101727895A CN101727895A (en) | 2010-06-09 |
| CN101727895B true CN101727895B (en) | 2012-06-06 |
Family
ID=42448686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102243746A Active CN101727895B (en) | 2008-10-20 | 2008-10-20 | Noise reduction device, computer and noise reduction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101727895B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810187A (en) * | 2014-12-29 | 2016-07-27 | 联想(北京)有限公司 | Noise eliminating method and device |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314868A (en) * | 2010-06-30 | 2012-01-11 | 中兴通讯股份有限公司 | Fan noise inhibition method and device |
| WO2012083698A1 (en) * | 2011-08-01 | 2012-06-28 | 华为技术有限公司 | Ventilation denoising device and ventilation denoising system |
| CN103531195A (en) * | 2012-07-02 | 2014-01-22 | 华为技术有限公司 | Noise reduction method, equipment and system |
| CN103383843A (en) * | 2013-07-24 | 2013-11-06 | 海尔集团公司 | Active noise reduction method and device for washing machine and washing machine |
| CN104375362A (en) * | 2014-10-31 | 2015-02-25 | 深圳市帅映科技有限公司 | Automatic noise lowering method, device and system of projector |
| CN105025182B (en) * | 2015-06-11 | 2018-07-06 | 广东欧珀移动通信有限公司 | A kind of noise-reduction method and terminal |
| CN105635704A (en) * | 2015-12-31 | 2016-06-01 | 苏州佳世达光电有限公司 | Projection noise reduction system and noise reduction method |
| CN106647346A (en) * | 2016-09-26 | 2017-05-10 | 郑州云海信息技术有限公司 | Electronic noise reduction system control method and device |
| CN110015253B (en) * | 2018-01-10 | 2022-12-23 | 宇通客车股份有限公司 | Active noise reduction control method and system for vehicle |
| CN109489190B (en) * | 2018-09-18 | 2021-04-06 | 广东优世联合控股集团股份有限公司 | Method and system for regulating and controlling cold quantity of machine room |
| CN109362001A (en) * | 2018-09-26 | 2019-02-19 | 努比亚技术有限公司 | A kind of terminal noise control method, terminal and computer readable storage medium |
| CN110762054A (en) * | 2019-09-23 | 2020-02-07 | 三一重机有限公司 | Noise reduction method and device for fan noise |
| CN112139191B (en) * | 2020-09-11 | 2021-06-25 | 中航华东光电（上海）有限公司 | Voice processing system and method based on active noise reduction and intelligent fume hood system |
| CN112509549B (en) * | 2020-12-28 | 2022-08-05 | 重庆电子工程职业学院 | Active noise reduction method for ambient noise |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394291Y (en) * | 1999-09-16 | 2000-08-30 | 中国船舶工业总公司第七研究院第七一一研究所 | Electronic silencer in small space |
| EP1489594A2 (en) * | 2003-06-17 | 2004-12-22 | HONDA MOTOR CO., Ltd. | Active vibratory noise control apparatus for cancelling noise inside a vehicle |
| CN101142620A (en) * | 2005-03-14 | 2008-03-12 | 惠普开发有限公司 | Noise cancellation module |
| CN101206854A (en) * | 2006-12-14 | 2008-06-25 | 福特全球技术公司 | Indirect acoustic transfer control of noise |
| CN101206853A (en) * | 2006-12-14 | 2008-06-25 | 福特全球技术公司 | Adaptive noise control system |
| CN101231846A (en) * | 2007-12-27 | 2008-07-30 | 中国农业大学 | Initiative noise control system and noise control method using sound wave interference mode |
-
2008
- 2008-10-20 CN CN2008102243746A patent/CN101727895B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394291Y (en) * | 1999-09-16 | 2000-08-30 | 中国船舶工业总公司第七研究院第七一一研究所 | Electronic silencer in small space |
| EP1489594A2 (en) * | 2003-06-17 | 2004-12-22 | HONDA MOTOR CO., Ltd. | Active vibratory noise control apparatus for cancelling noise inside a vehicle |
| CN101142620A (en) * | 2005-03-14 | 2008-03-12 | 惠普开发有限公司 | Noise cancellation module |
| CN101206854A (en) * | 2006-12-14 | 2008-06-25 | 福特全球技术公司 | Indirect acoustic transfer control of noise |
| CN101206853A (en) * | 2006-12-14 | 2008-06-25 | 福特全球技术公司 | Adaptive noise control system |
| CN101231846A (en) * | 2007-12-27 | 2008-07-30 | 中国农业大学 | Initiative noise control system and noise control method using sound wave interference mode |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810187A (en) * | 2014-12-29 | 2016-07-27 | 联想(北京)有限公司 | Noise eliminating method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101727895A (en) | 2010-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101727895B (en) | Noise reduction device, computer and noise reduction method | |
| Khodja et al. | Bearing fault diagnosis of a PWM inverter fed-induction motor using an improved short time Fourier transform | |
| CN103235180A (en) | Inter-harmonics measuring method for power grid | |
| KR920015021A (en) | System and method for monitoring synchronous blade vibration | |
| Diao et al. | An interpolation algorithm for discrete Fourier transforms of weighted damped sinusoidal signals | |
| CN104457971A (en) | Frequency scanning test method for noise prediction of power capacitor | |
| CN102353500A (en) | Extraction method of unbalanced signal for dynamic balance measurement | |
| CN102521502B (en) | Wavelet packet-assisted self-adaption anti-aliasing ensemble empirical mode decomposition method | |
| CN109540482B (en) | Method and device for analyzing keyless synchronous vibration parameters of turbine blade | |
| CN111947957A (en) | Vibration signal sampling method and device, storage medium and electronic equipment | |
| CN110108467A (en) | Active sounding speed-measuring method based on portable mobile apparatus | |
| Li et al. | Frequency estimation based on modulation FFT and MUSIC algorithm | |
| Prudnikov et al. | Virtual model of an induction motor with rotor eccentricity | |
| Wang et al. | A novel method for digital ultrasonic time-of-flight measurement | |
| Orji et al. | Non‐intrusive induction motor speed detection | |
| CN111999635A (en) | Board card fault signal analysis method and terminal based on 4-item 5-order Nuttall window | |
| Yang et al. | A novel detection method for supersynchronous resonance from synchrophasor data | |
| CN101261618A (en) | Triangular self-convolution window weighting algorithm | |
| Huang et al. | Mechanical fault diagnosis based on all-phase FFT parameters estimation | |
| Li et al. | Detection method of ship-radiated noise based on fractional-order dual coupling oscillator | |
| CN111579868B (en) | Method and device for measuring higher harmonics | |
| Bellini | Quad demodulation: A time-domain diagnostic method for induction machines | |
| CN102118036B (en) | Moving die test method by use of restraint subsynchronous resonance (SSR) device | |
| CN104407516A (en) | Synchronous tracking method of actually measured revolving speed and calculated revolving speed by generator excitation device | |
| CN203519631U (en) | Turbocharger rotation speed measuring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |