CN104936101B - A kind of active denoising device - Google Patents
A kind of active denoising device Download PDFInfo
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- CN104936101B CN104936101B CN201510213039.6A CN201510213039A CN104936101B CN 104936101 B CN104936101 B CN 104936101B CN 201510213039 A CN201510213039 A CN 201510213039A CN 104936101 B CN104936101 B CN 104936101B
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Abstract
The present invention is in order to strengthen in confined space during noise reduction to the specific aim and purpose of sound to be canceled, there is provided a kind of active denoising device.The denoising device includes multiple detection units and the denoising device is arranged in confined space and is used to carry out the voice signal in the space active noise reduction, and the denoising device also includes being arranged at the active noise reduction module near detection unit.The beneficial effects of the invention are as follows：Accuracy of detection and stability of the denoising device under noisy environment are improved, especially improves the detection specific aim by the denoising device of sound detection.
Description
Technical field
The present invention relates to noise reduction technology field, more particularly, to a kind of active denoising device.
Background technology
It is usually that noise is filtered out and noise reduction at present for the sound collection of a certain confined space.For example, in order to drop
The vibration of low elevator operation and noise, need to set vibration and noise reducing device between guide rail bracket of elevator and the borehole wall.
No. 2009201306131 Chinese patents disclose a kind of noise reduction damping device of cage guide, as shown in Figure 1, Figure 2, including surge tank
101, surge tank 101 is interior to be filled with elastic damping pad 102, and the middle part of cushion blocking 102 is provided with bar shaped slot 103, surge tank 101
The relevant position of bar shaped slot 103 is being provided with bar shaped socket 104, the one end of rail brackets 105 is inserted into through bar shaped socket 104
In the bar shaped slot 103 of cushion blocking 102, the other end of rail brackets 105 then mutually connects firmly with cage guide.The noise reduction damping fills
Put, during elevator motion, the end that rail brackets is inserted in cushion blocking can press the cushion blockings of both sides, become cushion blocking
Shape, so as to absorb vibration, eliminate noise.
But above-mentioned vibration-reducing and noise-reducing device for elevator guiding track, cushion blocking are only located at the front and rear side of rail brackets, rail brackets is only
Front and rear side can large area pressing cushion blocking, thus its be only capable of absorb horizontal direction vibration；And rail brackets front end and vibration damping
Pad is linear contact lay, and contact area is small, and the vibration for vertical direction is then difficult to reach good effectiveness in vibration suppression.And elevator was run
The vibration of vertical direction inevitably be present in Cheng Zhong, cage guide, thus, its damping noise reduction ability existing defects.
It is stronger, better for the confined space of the formation such as existing elevator monitoring equipment, headset, still lack of targeted
Active noise reducing device.
The content of the invention
The present invention is in order to strengthen in confined space during noise reduction to the specific aim and purpose of sound to be canceled, there is provided one
The active denoising device of kind.The denoising device includes multiple detection units and the denoising device is arranged in confined space and is used for
Active noise reduction is carried out to the voice signal in the space, the denoising device also includes being arranged at the active drop near detection unit
Make an uproar module, the active noise reduction module includes control unit, Noise Acquisition unit, noise classification unit, switch matrix, envelope
It is analytic unit, envelope processing unit, the first anti-phase spectrum generation unit, noise spectrum generation unit, noise spectrum processing unit, second anti-
Phase spectrum generation unit, noise reduction output unit, the closure of each switch in described control unit controlling switch matrix or are opened simultaneously
The parameter setting of other units, the Noise Acquisition unit acquisition noise signal are controlled, noise classification unit is made an uproar to described
Acoustical signal is classified according to pre-defined rule, switch matrix be used for select be classified after noise signal output whether, noise
Compose generation unit to be used to generate noise spectrum to the noise signal for switching Output matrix, noise spectrum processing unit is used to enter noise spectrum
Digitized processing, the second anti-phase spectrum generation unit produce the second de-noising signal, noise reduction according to the output of noise spectrum processing unit
Output unit is used to launch the second de-noising signal, and counteracting is overlapped with noise signal.
Further, described confined space is lift space.
Further, the voice signal progress active noise reduction in the described pair of space is：To monitoring camera device collection
Voice signal carries out active noise reduction.
Further, the detection unit includes noise reduction sound transducer.
Further, whether the envelope that the Envelope Analysis unit is used to analyze the signal of switch matrix output has repetition
Property and will wherein have the signal output of repeated envelope, the envelope processing unit is used for according to the output of Envelope Analysis unit
It is digitized, the first anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization.
Further, the denoising device also includes solar cell, and the battery is the active noise reduction module and inspection
Survey unit power supply.
Further, the confined space is the space that headset is formed.
Further, the detection unit is noise reduction microphone.
The beneficial effects of the invention are as follows：Accuracy of detection and stability of the denoising device under noisy environment are improved, especially
It is to improve the detection specific aim by the denoising device of sound detection.
Brief description of the drawings
Fig. 1 shows the structured flowchart of the active denoising device according to the present invention.
Embodiment
As shown in figure 1, for example, in lift space, supervising device collection video and audio-frequency information, the audio-frequency information just by
Arrived elevator switch door, elevator operation, apparatus for controlling elevator electronic noise etc. interference so that elevator monitoring equipment without
Method is effectively monitored to slight voice in lift space etc..The denoising device of the present invention includes multiple single as detection
The sound transducer and the denoising device of member are arranged on confined space (for example, confined space that lift space, headset are formed)
Interior to be used to carry out active noise reduction to the voice signal in the space, sound transducer has used piezo-electric effect principle.Sound sensor
Device is arranged in the top surface of elevator interior in a distributed manner.
The denoising device also includes being arranged at the active noise reduction module near detection unit, the active noise reduction module
Including control unit, Noise Acquisition unit, noise classification unit, switch matrix, Envelope Analysis unit, envelope processing unit,
One anti-phase spectrum generation unit, noise spectrum generation unit, noise spectrum processing unit, the second anti-phase spectrum generation unit, noise reduction output are single
Member, the closure or opening of each switch in described control unit controlling switch matrix simultaneously control the parameter of other units to set
Put, the Noise Acquisition unit acquisition noise signal, noise classification unit divides according to pre-defined rule the noise signal
Class, switch matrix be used for select be classified after noise signal output whether, noise spectrum generation unit be used for switch matrix
The noise signal generation noise spectrum of output, noise spectrum processing unit are used to be digitized noise spectrum processing, the second anti-phase spectrum
Generation unit produces the second de-noising signal according to the output of noise spectrum processing unit, and noise reduction output unit is used to believe the second noise reduction
Number launch, counteracting is overlapped with noise signal.
The denoising device also includes solar cell, and the battery is that the active noise reduction module and detection unit supply
Electricity.This design is in order to avoid other kinds of power supply may be done to electromagnetic signal caused by detection during use in charging
Disturb.
Wherein, the Noise Acquisition unit includes multiple small-sized noise reduction microphones, and these microphones are set in a distributed manner
Put near position to be monitored.
The Envelope Analysis unit be used for analyze switch matrix output signal envelope whether have repeatability and by its
In have repeated envelope signal output, the envelope processing unit be used for according to the output of Envelope Analysis unit carry out numeral
Change, the first anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization.Envelope Analysis unit is first
The noise signal for inputting Envelope Analysis unit is sampled according to intervals (such as 5ms), then obtained sampling
Amplitude point be wired to envelope.After obtaining envelope, determine whether the interval between maximum has repetition even regular
Repetition, if it is present the sound of repeatability be present in the noise signal for showing to be transfused to Envelope Analysis unit.Practical application mistake
Cheng Zhong, the sound that repeatability be present typically is not qualified as voice signal, hence, it can be determined that the repeated sound is should
It is eliminated.If showing there is the sound of repeatability, Envelope Analysis unit in the noise signal for being transfused to Envelope Analysis unit
The envelope that the envelope range value being repeated cyclically is formed is output to envelope processing unit, is digitized the follow-up place such as processing
Reason.Otherwise, the signal of Envelope Analysis unit output will be directed into noise spectrum generation unit and skip envelope processing unit and the
One anti-phase spectrum generation unit.
When what is exported from Envelope Analysis unit there is the envelope signal for being repeated cyclically feature to be input into envelope processing list
After member, envelope processing unit is digitized to the signal of the input.In the digitized process, with the repetition period of envelope with
And extreme value is that 2-D data forms two-dimensional matrix.Then, the digitized two-dimensional matrix is output to the first anti-phase spectrum generation list
Member.The first anti-phase spectrum generation unit includes matrixing unit and signal generation unit, and wherein matrixing unit is to above-mentioned
Two-dimensional matrix carries out inversion operation, and signal generation unit is for example, by IFFT according to the new two-dimensional matrix generation obtained after negating
The waveform of time domain, waveform quantization scale during generation are identical with above-mentioned time interval (such as 5ms).Then, the time domain
Waveform is sent by noise reduction output unit, and noise is repeated cyclically to eliminate in pending noise signal.Upper
During stating Envelope Analysis, processing and output, generated and the anti-phase letter of periodic noise using anti-phase be able to ensure that is digitized
Number amplitude, the cycle and the amplitude in former noise signal, cycle it is accurately identical.This is merely using simulating SOC noise reductions
Chip is incomparable.
The noise spectrum processing unit includes filter unit, and the filter unit is filtered out by digitlization according to predetermined rule
A part for the noise spectrum of processing.According to one embodiment of the invention, the predetermined rule is to set the filter unit as height
The mode of the parameter of at least one of bandpass filter, low pass filter or bandpass filter etc..For example, for noisy ring
, it is necessary to the mainly high pass noise filtered out, now being chosen by the filtering mode rule in the active noise reduction module can in border
To set filter unit therein as low pass filter.Preferably, the filter unit lacks an analog-digital converter and corresponded to therewith
Digital filter.So, the signal for being input to noise spectrum processing unit is first be converted into data signal, then passes through IIR
Digital filter, Finite Impulse Response filter etc. carry out digital filtering.It is this to convert analog signals into what data signal was handled
Mode can be greatly enhanced the processing accuracy to signal and avoid the interference of filtering median filter in itself and it is extraneous its
Interference caused by his factor.
The noise reduction output unit includes multiple noise reduction horns, and these loudspeaker correspond with described microphone position
Ground is set.These noise reduction horns are used to export the first de-noising signal (if any) and the second de-noising signal.
The noise classification unit includes memory, wave f orm analysis unit and sound characteristic comparing unit.Storage
The respective vocal print of multiple personnel and its corresponding relation with corresponding personnel have been pre-saved in device, has been included but is not limited to：Elevator pipe
The vocal print ensured public security in the vocal print and/or building of reason person.These vocal prints can pass through vocal print acquisition device of the prior art or vocal print
The acquisition such as device or method is established in storehouse, and is preserved in the form of a file in memory.Preferably, the data quilt in this document
Save as and refer to vocal print matrix.Wave f orm analysis unit carries out voiceprint extraction to the signal of input noise taxon, and will
The result of extraction saves as actual vocal print matrix by TES algorithms, by the Output matrix to sound characteristic comparing unit.Sound is special
Comparing unit is levied by actual vocal print matrix compared with the reference vocal print matrix prestored in memory, according to comparative result
Determine that the sound being transfused to includes the sound of existing personnel in which memory.So, control unit can passes through
The sorting parameter of noise classification unit is set, and personal information and its corresponding vocal print is preserved, changed or deleted into memory
Information.
The signal of noise classification unit output is input into switch matrix.Switch matrix includes multiple passages, each passage
Include a switch that can control the passage to be opened or closed.The closure or opening of each switch are controlled by control unit.This
Sample, it becomes possible to optionally retain the sound that some personnel near in actual environment send by the switch matrix and be not regarded as
It is noise (and being not dropped) or is treated as noise (and being dropped).This have the advantage that can realize to eliminate in active
Retain some while other voice or some specific voice are not eliminated by active noise reduction.
The noise spectrum generation unit includes FFT computing units, and it is according to the time domain letter for being input to noise spectrum generation unit
Number carry out FFT computings, obtain the frequency spectrum of the input signal.
The second anti-phase spectrum generation unit includes anti-phase matrix generation unit, IFFT computing units and waveform generator.
The second anti-phase spectrum generation unit and first anti-phase principle for composing generation unit and the course of work are similar, simply second anti-at this
In phase spectrum generation unit, the matrixing unit of the first anti-phase spectrum generation unit produces equivalent to IFFT computing units and waveform
Device.And in the second anti-phase spectrum generation unit, IFFT computing units and waveform generator is spaced-apart, it is favorably improved pair
In the disposal ability of complicated spectrum signal, the interference that the analog device in processing procedure in waveform generator is brought is reduced.Ability
Field technique personnel should be understood that the IFFT computing units and waveform generator can on the premise of noise reduction required precision is met
To be combined into one, using the matrixing unit in the first anti-phase spectrum generation unit.
Above-mentioned embodiment is only the specific case of the present invention, and scope of patent protection of the invention includes but is not limited to
Above-mentioned embodiment, any person of an ordinary skill in the technical field that meet claims of the present invention and any
The appropriate change or replacement done to it, it should all fall into the scope of patent protection of the present invention.
Claims (7)
1. a kind of active denoising device, the denoising device includes multiple detection units and the denoising device is arranged on confined air
It is interior to be used to carry out active noise reduction to the voice signal in the space, it is characterised in that the denoising device also includes being arranged at inspection
The active noise reduction module surveyed near unit, the active noise reduction module include control unit, Noise Acquisition unit, noise point
Class unit, switch matrix, Envelope Analysis unit, envelope processing unit, first it is anti-phase spectrum generation unit, noise spectrum generation unit,
Noise spectrum processing unit, the second anti-phase spectrum generation unit, noise reduction output unit, it is each in described control unit controlling switch matrix
The closure or opening of individual switch simultaneously control the parameter setting of other units, the Noise Acquisition unit acquisition noise signal,
Noise classification unit is classified to the noise signal according to pre-defined rule, and switch matrix is used to select the noise after being classified
Whether is the output of signal, and noise spectrum generation unit is used to generate the noise signal for switching Output matrix noise spectrum, at noise spectrum
Reason unit is used to be digitized noise spectrum processing, and the second anti-phase spectrum generation unit is produced according to the output of noise spectrum processing unit
Raw second de-noising signal, noise reduction output unit are used to launch the second de-noising signal, and counteracting is overlapped with noise signal,
The Envelope Analysis unit be used for analyze switch matrix output signal envelope whether have repeatability and will wherein with weigh
The signal output of renaturation envelope, the envelope processing unit is used to be digitized according to the output of Envelope Analysis unit, described
First anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization；
Envelope Analysis unit samples to the noise signal for inputting Envelope Analysis unit according to intervals first, then
The amplitude point that sampling obtains is wired to envelope；After obtaining envelope, determine whether the interval between maximum has repetition very
To being regular repetition, if it is present showing that the noise signal for being transfused to Envelope Analysis unit has the sound of repeatability；
Then the envelope that the envelope range value being repeated cyclically is formed is output to envelope processing unit by Envelope Analysis unit；Otherwise, envelope
The signal of analytic unit output will be directed into noise spectrum generation unit and skip envelope processing unit and the first anti-phase spectrum generation
Unit；
After having of being exported from Envelope Analysis unit is repeated cyclically the envelope signal of feature and is input into envelope processing unit,
Envelope processing unit is digitized to the signal of the input；In the digitized process, with the repetition period of envelope and pole
It is worth and forms two-dimensional matrix for 2-D data；Then, the digitized two-dimensional matrix is output to the first anti-phase spectrum generation unit；Should
First anti-phase spectrum generation unit includes matrixing unit and signal generation unit, and wherein matrixing unit is to above-mentioned Two-Dimensional Moment
Battle array carries out inversion operation, and signal generation unit produces described first according to the new two-dimensional matrix obtained after negating by IFFT and dropped
Noise cancellation signal, first de-noising signal quantization scale during generation are identical with above-mentioned time interval；Then, this described first
De-noising signal is sent by noise reduction output unit, and noise is repeated cyclically to eliminate in pending noise signal；
During above-mentioned Envelope Analysis, processing and output, it is able to ensure that generation and periodic noise are anti-phase using digitlization is anti-phase
The amplitude of signal, cycle and the amplitude in former noise signal, cycle are accurately identical.
2. active denoising device according to claim 1, it is characterised in that described confined space is lift space.
3. active denoising device according to claim 1, it is characterised in that the voice signal in the described pair of space enters
Row active noise reduction is：Active noise reduction is carried out to the voice signal of monitoring camera device collection.
4. active denoising device according to claim 3, it is characterised in that the detection unit passes including noise reduction sound
Sensor.
5. active denoising device according to claim 1, it is characterised in that the denoising device also includes solar-electricity
Pond, the battery are that the active noise reduction module and detection unit are powered.
6. active denoising device according to claim 1, it is characterised in that the confined space is the sky that headset is formed
Between.
7. active denoising device according to claim 6, it is characterised in that the detection unit is noise reduction microphone.
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| CN201510213039.6A CN104936101B (en) | 2015-04-29 | 2015-04-29 | A kind of active denoising device |
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| CN201510213039.6A CN104936101B (en) | 2015-04-29 | 2015-04-29 | A kind of active denoising device |
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| CN104936101B true CN104936101B (en) | 2018-01-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106251878A (en) * | 2016-08-26 | 2016-12-21 | 彭胜 | Meeting affairs voice recording device |
| WO2018163328A1 (en) * | 2017-03-08 | 2018-09-13 | 三菱電機株式会社 | Acoustic signal processing device, acoustic signal processing method, and hands-free calling device |
| CN109448747A (en) * | 2018-09-14 | 2019-03-08 | 日立楼宇技术（广州）有限公司 | Generation method, device, computer equipment and the storage medium of anti-noise sound wave |
| CN109068250B (en) * | 2018-10-15 | 2021-01-08 | 维沃移动通信有限公司 | Microphone and electronic equipment |
| CN112556834A (en) * | 2020-12-11 | 2021-03-26 | 陈学良 | Urban noise alarm prediction system based on Internet of things |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7020288B1 (en) * | 1999-08-20 | 2006-03-28 | Matsushita Electric Industrial Co., Ltd. | Noise reduction apparatus |
| CN101751918A (en) * | 2008-12-18 | 2010-06-23 | 李双清 | Novel silencer and noise reduction method |
| CN102045621A (en) * | 2009-10-15 | 2011-05-04 | 索尼公司 | Sound processing apparatus, sound processing method, and sound processing program |
| CN103440861A (en) * | 2013-08-30 | 2013-12-11 | 云南省科学技术情报研究院 | Self-adaption noise reduction device for low frequency noise in indoor environment |
| CN204069274U (en) * | 2014-10-10 | 2014-12-31 | 量子精工机械(山东)有限公司 | A kind of industrial noise reduction bluetooth earphone |
-
2015
- 2015-04-29 CN CN201510213039.6A patent/CN104936101B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7020288B1 (en) * | 1999-08-20 | 2006-03-28 | Matsushita Electric Industrial Co., Ltd. | Noise reduction apparatus |
| CN101751918A (en) * | 2008-12-18 | 2010-06-23 | 李双清 | Novel silencer and noise reduction method |
| CN102045621A (en) * | 2009-10-15 | 2011-05-04 | 索尼公司 | Sound processing apparatus, sound processing method, and sound processing program |
| CN103440861A (en) * | 2013-08-30 | 2013-12-11 | 云南省科学技术情报研究院 | Self-adaption noise reduction device for low frequency noise in indoor environment |
| CN204069274U (en) * | 2014-10-10 | 2014-12-31 | 量子精工机械(山东)有限公司 | A kind of industrial noise reduction bluetooth earphone |
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