CN104361893A - Mobile phone noise reduction device and noise reduction method thereof - Google Patents
Mobile phone noise reduction device and noise reduction method thereof Download PDFInfo
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Abstract
The invention discloses a noise reduction device which comprises a noise inlet. A first input end is arranged at the position of the center of the noise inlet, a plurality of second input ends are annularly arranged at the position of the entry of the noise inlet, third input ends identical to the second input ends in number are annularly arranged on the outer side of the first input end, and the first input end, the second input ends and the third input ends are respectively connected to an audio processing module. The invention further discloses a noise reduction method adopting the mobile phone noise reduction device. By the arrangement, the shortcoming in the prior art can be overcome; the level of audio noise reduction is greatly improved through improvement of an audio collection device and by means of wavelet transformation optimized specifically to the collection device.
Description
Technical field
The present invention relates to audio defeat technical field, especially a kind of noise reduction device of mobile phone and noise-reduction method thereof.
Background technology
Speech quality in mobile phone communication process is an important research direction of this area.Chinese invention patent CN 102185992B discloses a kind of bidirectional active denoising device for mobile phone, and this structure serves certain effect to mobile phone communication noise reduction.But noise and acoustic source are closely in a lot of situation, this structure accurately cannot be separated the audio frequency mixed, and easily causes the damage of acoustic source.In recent years, the fast development of wavelet de-noising technology, also had some to be successfully applied to the example of audio defeat.But existing wavelet de-noising technology also only rests on and directly to gather sound signal and the level of noise reduction, cannot be separated accurately noise.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of noise reduction device of mobile phone and noise-reduction method thereof, the deficiencies in the prior art can be solved, logical improve audio collecting device, and the means of wavelet transformation by being optimized for harvester, greatly improve the level of audio defeat.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
A kind of noise reduction device of mobile phone, comprise sound inlet, the center of sound inlet is provided with first input end, inflow point's annular of sound inlet is provided with several the second input ends, the exterior annular of first input end is provided with three input end identical with the second input end quantity, and first input end, the second input end and the 3rd input end are connected to audio processing modules respectively.
As preferably, described first input end is circular, and the center of first input end is provided with truncated cone-shaped depression, and the end face of truncated cone-shaped depression and the area ratio of bottom surface are 7: 6 ~ 11: 10, and the sidewall of truncated cone-shaped depression is provided with first of annular and gathers port.
As preferably, described second input end is the circular arc concentric with described first input end, and the second input end top is provided with hemispheric second and gathers port.
As preferably, described 3rd input end is rectangle, and the surface of the 3rd input end is provided with the 3rd and gathers port, and the 3rd input end tilts towards the outside of first input end, and the angle of the 3rd input end and first input end is 100 ° ~ 120 °.
As preferably, described sound inlet is provided with filtration gauze.
Use a noise-reduction method for above-mentioned noise reduction device of mobile phone, comprise the following steps:
A, first input end, the second input end and the 3rd input end is used to obtain the different signal of three of same audio frequency respectively;
B, the dwt function in matlab software is used to carry out one-dimensinal discrete small wave transformation the signal of first input end collection, use the dwtpet2 function in matlab software to carry out two-dimension periodic wavelet transformation the signal of the second input end collection, use the dwtpet function in matlab software to carry out One Dimension Periodic wavelet transformation the signal of the 3rd input end collection; The signal carrying out wavelet transformation is carried out denoising;
C, the waverec function in matlab software is used to carry out wavelet reconstruction through the signal of step B process the second input end and the 3rd input end, then the signal result of reconstruct and first input end being entered step B process uses the upcoef function in matlab software directly to reconstruct, and is reduced to sound signal.
As preferably, in step B.
Dwt function is used to carry out in one-dimensinal discrete small wave transformation process, being chosen as of threshold alpha.
Dwtpet2 function is used to carry out in two-dimension periodic wavelet transform procedure, being chosen as of threshold value beta.
Dwtpet function is used to carry out in One Dimension Periodic wavelet transform procedure, being chosen as of threshold gamma
The beneficial effect adopting technique scheme to bring is: the present invention is by the structure of optimizing audio harvester, triple collection is carried out to same sound signal, and then wavelet transformation and reconstruct are targetedly carried out to the sound signal come by different channel acquisition, thus improve the separation rate of noise signal and acoustic source, improve noise abatement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of hardware configuration in the present invention's embodiment.
In figure: 1, sound inlet; 2, first input end; 3, the second input end; 4, the 3rd input end; 5, audio processing modules; 6, truncated cone-shaped depression; 7, first port is gathered; 8, second port is gathered; 9, the 3rd port is gathered; 10, filtration gauze; 11, rectangle resonance piece; 12; Annular resonance sheet.
Embodiment
The standardized element used in the present invention all can be commercially, shaped piece all can carry out customized according to instructions with the record of accompanying drawing, the concrete connected mode of each part all adopts the conventional means such as bolt, rivet, welding, stickup ripe in prior art, is not described in detail in this.
With reference to Fig. 1, the present invention's embodiment comprises sound inlet 1, the center of sound inlet 1 is provided with first input end 2, inflow point's annular of sound inlet 1 is provided with several the second input ends 3, the exterior annular of first input end 2 is provided with three input end 4 identical with the second input end 3 quantity, and first input end 2, second input end 3 and the 3rd input end 4 are connected to audio processing modules 5 respectively.
It should be noted that described first input end 2 is for circular, the center of first input end 2 is provided with truncated cone-shaped depression 6, and the truncated cone-shaped depression end face of 6 and the area ratio of bottom surface are 8: 7, and the sidewall of truncated cone-shaped depression 6 is provided with first of annular and gathers port 7.
It should be noted that described second input end 3 is the circular arc concentric with described first input end 2, the second input end 3 top is provided with hemispheric second and gathers port 8.
It should be noted that described 3rd input end 4 is rectangle, the surface of the 3rd input end 4 is provided with the 3rd and gathers port 9, and the 3rd input end 4 tilts towards the outside of first input end 2, and the 3rd input end 4 is 105 ° with the angle of first input end 2.
It should be noted that and described sound inlet 1 is provided with filtration gauze 10.
Wherein, be provided with between the second input end 3 and first input end 2 between rectangle resonance piece the 11, three input end 4 and first input end 2 and be provided with annular resonance sheet 12.The thickness of rectangle resonance piece 11 is 0.15mm, and Young modulus is 0.3MPa, and the thickness of annular resonance sheet 12 is 0.18mm, and Young modulus is 0.25MPa.
Use a noise-reduction method for above-mentioned noise reduction device of mobile phone, comprise the following steps:
A, first input end 2, second input end 3 and the 3rd input end 4 is used to obtain the different signal of three of same audio frequency respectively;
B, the signal gathered by first input end 2 use the dwt function in matlab software to carry out one-dimensinal discrete small wave transformation, the signal gathered by second input end 3 uses the dwtpet2 function in matlab software to carry out two-dimension periodic wavelet transformation, and the signal gathered by the 3rd input end 3 uses the dwtpet function in matlab software to carry out One Dimension Periodic wavelet transformation; The signal carrying out wavelet transformation is carried out denoising;
C, the waverec function in matlab software is used to carry out wavelet reconstruction through the signal of step B process the second input end 3 and the 3rd input end 4, then the signal result of reconstruct and first input end 2 being entered step B process uses the upcoef function in matlab software directly to reconstruct, and is reduced to sound signal.
In step B, dwt function is used to carry out in one-dimensinal discrete small wave transformation process, being chosen as of threshold alpha.
Dwtpet2 function is used to carry out in two-dimension periodic wavelet transform procedure, being chosen as of threshold value beta.
Dwtpet function is used to carry out in One Dimension Periodic wavelet transform procedure, being chosen as of threshold gamma
In step C, before the waverec function in the signal use matlab software of step B process carries out wavelet reconstruction to the second input end 3 and the 3rd input end 4, the second input end 3 and the 3rd input end 4 are used time-dependent Schrodinger equation respectively through the signal of step B process
Be normalized.Before the signal result of above-mentioned reconstruct and first input end 2 being entered to step B process uses the upcoef function in matlab software directly to reconstruct, the signal that the result of above-mentioned reconstruct and first input end 2 entered step B process is carried out Orthogonal Decomposition.
The prior art quoted in use background technology and the present embodiment carry out contrast test test, and adopt same sound signal to input, the output signal-to-noise ratio obtained is::
| Product | The signal to noise ratio (S/N ratio) (dB) of output audio signal |
| The embodiment of institute's referenced patents in background technology | 81 |
| The present embodiment | 126 |
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (7)
1. a noise reduction device of mobile phone, it is characterized in that: comprise sound inlet (1), the center of sound inlet (1) is provided with first input end (2), inflow point's annular of sound inlet (1) is provided with several the second input ends (3), the exterior annular of first input end (2) is provided with three input end (4) identical with the second input end (3) quantity, and first input end (2), the second input end (3) and the 3rd input end (4) are connected to audio processing modules (5) respectively.
2. noise reduction device of mobile phone according to claim 1, it is characterized in that: described first input end (2) is for circular, the center of first input end (2) is provided with truncated cone-shaped depression (6), the truncated cone-shaped depression end face of (6) and the area ratio of bottom surface are 7: 6 ~ 11: 10, and the sidewall of truncated cone-shaped depression (6) is provided with first of annular and gathers port (7).
3. noise reduction device of mobile phone according to claim 1, it is characterized in that: described second input end (3) is the circular arc concentric with described first input end (2), the second input end (3) top is provided with hemispheric second and gathers port (8).
4. noise reduction device of mobile phone according to claim 1, it is characterized in that: described 3rd input end (4) is rectangle, the surface of the 3rd input end (4) is provided with the 3rd and gathers port (9), 3rd input end (4) tilts towards the outside of first input end (2), and the 3rd input end (4) is 100 ° ~ 120 ° with the angle of first input end (2).
5. noise reduction device of mobile phone according to claim 1, is characterized in that: described sound inlet (1) is provided with filtration gauze (10).
6. use a noise-reduction method for the noise reduction device of mobile phone in above-mentioned any one, it is characterized in that comprising the following steps:
A, first input end (2), the second input end (3) and the 3rd input end (4) is used to obtain the different signal of three of same audio frequency respectively;
B, the signal gathered by first input end (2) use the dwt function in matlab software to carry out one-dimensinal discrete small wave transformation, the signal gathered by second input end (3) uses the dwtpet2 function in matlab software to carry out two-dimension periodic wavelet transformation, and the signal gathered by the 3rd input end (3) uses the dwtpet function in matlab software to carry out One Dimension Periodic wavelet transformation; The signal carrying out wavelet transformation is carried out denoising;
C, the waverec function in matlab software is used to carry out wavelet reconstruction through the signal of step B process the second input end (3) and the 3rd input end (4), then the signal result of reconstruct and first input end (2) being entered step B process uses the upcoef function in matlab software directly to reconstruct, and is reduced to sound signal.
7. noise-reduction method according to claim 6, is characterized in that: in step B, uses dwt function to carry out in one-dimensinal discrete small wave transformation process, being chosen as of threshold alpha.
Dwtpet2 function is used to carry out in two-dimension periodic wavelet transform procedure, being chosen as of threshold value beta.
Dwtpet function is used to carry out in One Dimension Periodic wavelet transform procedure, being chosen as of threshold gamma
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162998A (en) * | 2015-08-24 | 2015-12-16 | 小米科技有限责任公司 | Denoising method and denoising devices for dual tone multi frequency signal |
| CN108919065A (en) * | 2018-05-16 | 2018-11-30 | 国网浙江省电力有限公司电力科学研究院 | GIS ultrahigh frequency partial discharge monitoring management system |
| CN113421566A (en) * | 2021-08-20 | 2021-09-21 | 航天科工通信技术研究院有限责任公司 | Portable voice noise reduction device based on wind noise |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162998A (en) * | 2015-08-24 | 2015-12-16 | 小米科技有限责任公司 | Denoising method and denoising devices for dual tone multi frequency signal |
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| CN108919065A (en) * | 2018-05-16 | 2018-11-30 | 国网浙江省电力有限公司电力科学研究院 | GIS ultrahigh frequency partial discharge monitoring management system |
| CN113421566A (en) * | 2021-08-20 | 2021-09-21 | 航天科工通信技术研究院有限责任公司 | Portable voice noise reduction device based on wind noise |
| CN113421566B (en) * | 2021-08-20 | 2021-11-12 | 航天科工通信技术研究院有限责任公司 | Portable voice noise reduction device based on wind noise |
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Application publication date: 20150218 |