CN104936101A - Active noise reduction device - Google Patents
Active noise reduction device Download PDFInfo
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- CN104936101A CN104936101A CN201510213039.6A CN201510213039A CN104936101A CN 104936101 A CN104936101 A CN 104936101A CN 201510213039 A CN201510213039 A CN 201510213039A CN 104936101 A CN104936101 A CN 104936101A
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Abstract
The invention provides an active noise reduction device, and aims at improving the pertinency to sound to be eliminated in the noise reduction period in the enclosed space. The active noise reduction device comprises detection units and active noise reduction modules near the detection units respectively, and the noise reduction device is arranged in the enclosed space to actively reduce noise of sound signals in the space. The active noise reduction device has the advantages that the detection precision and stability of the noise reduction device in a noisy environment are improved, and especially the detection pertinency of the noise reduction device based on sound detection is improved.
Description
Technical field
The present invention relates to noise reduction technology field, more specifically, relate to a kind of active mode denoise device.
Background technology
For the sound collection of a certain confined space, be generally that filtering is carried out and noise reduction to noise at present.Such as, in order to reduce the vibration & noise that elevator runs, need between guide rail bracket of elevator and the borehole wall to arrange vibration and noise reducing device.No. 2009201306131 Chinese patents disclose a kind of noise reduction damping device of cage guide, as shown in Figure 1, Figure 2, comprise surge tank 101, elastic damping pad 102 is filled with in surge tank 101, the middle part of cushion blocking 102 is provided with bar shaped slot 103, surge tank 101 is being provided with bar shaped socket 104 with bar shaped slot 103 relevant position, and rail brackets 105 one end is inserted in the bar shaped slot 103 of cushion blocking 102 through bar shaped socket 104, and the other end of rail brackets 105 then connects firmly mutually with cage guide.This noise reduction damping device, in elevator motion process, the end that rail brackets is inserted in cushion blocking can press the cushion blocking of both sides, and cushion blocking is out of shape, thus absorbs vibration, stress release treatment.
But above-mentioned vibration-reducing and noise-reducing device for elevator guiding track, cushion blocking is only positioned at the side, front and back of rail brackets, rail brackets only before and after side can large-area pressing cushion blocking, thus it only can absorb the vibration of horizontal direction; And rail brackets front end and cushion blocking are linear contact lay, contact area is little, and the vibration for vertical direction is then difficult to reach good effectiveness in vibration suppression.And in running process of elevator, cage guide inevitably exists the vibration of vertical direction, thus, its damping noise reduction ability existing defects.
For the confined space that existing elevator monitoring equipment, headset etc. are formed, still lack the active noise reducing device that specific aim is stronger, effect is better.
Summary of the invention
The present invention, in order to strengthen in confined space during noise reduction the specific aim of sound to be canceled and purpose, provides a kind of active mode denoise device.This denoising device comprises multiple detecting unit and this denoising device is arranged in confined space for carrying out active noise reduction to the voice signal in this space, this denoising device also comprises the active mode denoise module be arranged near detecting unit, described active mode denoise module comprises control unit, Noise Acquisition unit, noise classification unit, switch matrix, Envelope Analysis unit, envelope processing unit, first anti-phase spectrum generation unit, noise spectrum generation unit, noise spectrum processing unit, second anti-phase spectrum generation unit, noise reduction output unit, each switch in described control unit control switch matrix closed or open and control the optimum configurations of unit described in other, described Noise Acquisition unit acquisition noise signal, noise classification unit is classified according to pre-defined rule to described noise signal, whether switch matrix for selecting the output of the noise signal after being classified, noise spectrum generation unit is used for composing the noise signal generted noise of switch Output matrix, noise spectrum processing unit is used for carrying out digitized processing to noise spectrum, second anti-phase spectrum generation unit produces the second de-noising signal according to the output of noise spectrum processing unit, noise reduction output unit is used for the second de-noising signal to launch, carry out superposing with noise signal and offset.
Further, described confined space is lift space.
Further, describedly active noise reduction is carried out to the voice signal in this space be: active noise reduction is carried out to the voice signal of monitoring camera device collection.
Further, described detecting unit comprises noise reducing sound sensor.
Further, whether described Envelope Analysis unit has repeatability for the envelope of the signal analyzing switch matrix output and wherein will have the signal output of repeated envelope, described envelope processing unit is used for carrying out digitlization according to the output of Envelope Analysis unit, and described first anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization.
Further, described denoising device also comprises solar cell, and this battery is that described active mode denoise module and detecting unit are powered.
Further, described confined space is the space that headset is formed.
Further, described detecting unit is noise reduction microphone.
The invention has the beneficial effects as follows: improve the accuracy of detection of this denoising device under noisy environment and stability, especially improve the detection specific aim of this denoising device relying on sound detection.
Accompanying drawing explanation
Fig. 1 shows the structured flowchart according to active mode denoise device of the present invention.
Embodiment
As shown in Figure 1, such as, in lift space, supervising device gathers Audio and Video information, this audio-frequency information just receives elevator switch door, elevator runs, the interference of the electronic noise of apparatus for controlling elevator etc., thus elevator monitoring equipment effectively cannot be monitored the slight voice etc. in lift space.Denoising device of the present invention comprises multiple sound transducer as detecting unit and this denoising device is arranged on confined space (such as, the confined space that lift space, headset are formed) interior for carrying out active noise reduction to the voice signal in this space, sound transducer employs piezoelectric effect principle.Sound transducer is arranged in the end face of elevator interior with being distributed formula.
This denoising device also comprises the active mode denoise module be arranged near detecting unit, described active mode denoise module comprises control unit, Noise Acquisition unit, noise classification unit, switch matrix, Envelope Analysis unit, envelope processing unit, first anti-phase spectrum generation unit, noise spectrum generation unit, noise spectrum processing unit, second anti-phase spectrum generation unit, noise reduction output unit, each switch in described control unit control switch matrix closed or open and control the optimum configurations of unit described in other, described Noise Acquisition unit acquisition noise signal, noise classification unit is classified according to pre-defined rule to described noise signal, whether switch matrix for selecting the output of the noise signal after being classified, noise spectrum generation unit is used for composing the noise signal generted noise of switch Output matrix, noise spectrum processing unit is used for carrying out digitized processing to noise spectrum, second anti-phase spectrum generation unit produces the second de-noising signal according to the output of noise spectrum processing unit, noise reduction output unit is used for the second de-noising signal to launch, carry out superposing with noise signal and offset.
Described denoising device also comprises solar cell, and this battery is that described active mode denoise module and detecting unit are powered.This design is in order to avoid the power supply of other kinds may to detecting the electromagnetic signal interference produced between the charging operating period.
Wherein, described Noise Acquisition unit comprises multiple small-sized noise reduction microphone, and these microphones are arranged near position to be monitored with being distributed formula.
Whether described Envelope Analysis unit has repeatability for the envelope of the signal analyzing switch matrix output and wherein will have the signal output of repeated envelope, described envelope processing unit is used for carrying out digitlization according to the output of Envelope Analysis unit, and described first anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization.First Envelope Analysis unit samples according to certain hour interval (such as 5ms) to the noise signal of input Envelope Analysis unit, then the amplitude point obtained of sampling is wired to envelope.After obtaining envelope, whether the interval determining between maximum has the repetition of repetition or even regularity, if existed, then the noise signal showing to be transfused to Envelope Analysis unit exists the sound of repeatability.In actual application, the sound that there is repeatability is not generally considered to voice signal, therefore, can determine that the sound of this repeatability should be eliminated.There is the sound of repeatability in the noise signal being transfused to Envelope Analysis unit if show, then the envelope that the envelope range value periodically repeated is formed is outputted to envelope processing unit by Envelope Analysis unit, carries out the subsequent treatment such as digitized processing.Otherwise the signal that Envelope Analysis unit exports skips envelope processing unit and the first anti-phase spectrum generation unit by directly entering noise spectrum generation unit.
After the envelope signal with periodically repeated characteristic exported from Envelope Analysis unit is imported into envelope processing unit, envelope processing unit carries out digitlization to the signal of this input.In this digitized process, with the repetition period of envelope and extreme value for 2-D data forms two-dimensional matrix.Then, this digitized two-dimensional matrix is outputted to the first anti-phase spectrum generation unit.This first anti-phase spectrum generation unit comprises matrixing unit and signal generation unit, wherein matrixing unit carries out inversion operation to above-mentioned two-dimensional matrix, signal generation unit produces the waveform of time domain according to the new two-dimensional matrix obtained after negate by such as IFFT, this waveform quantization scale in production process identical with the above-mentioned time interval (such as 5ms).Then, this time domain waveform is sent by by noise reduction output unit, to eliminate the periodicity repetitive noise in pending noise signal.In the process of above-mentioned Envelope Analysis, process and output, adopt digitlization anti-phase amplitude, the amplitude in cycle and former noise signal, the cycle can guaranteeing to generate the signal anti-phase with periodic noise identical accurately.This merely utilizes simulation SOC noise reduction chip incomparable.
Described noise spectrum processing unit comprises filter unit, and this filter unit is according to the part of predetermined regular filtering through the noise spectrum of digitized processing.According to one embodiment of the invention, described predetermined rule arranges the mode that this filter unit is the parameter of at least one in high pass filter, low pass filter or band pass filter etc.Such as, for noisy environment, needing the mainly high pass noise of filtering, is now low pass filter by the filter unit that just can arrange wherein of the filtering mode rule interestingness in this active mode denoise module.Preferably, the few analog to digital converter of this filter unit and digital filter corresponding with it.Like this, first the signal being input to noise spectrum processing unit is converted into digital signal, then carries out digital filtering by iir digital filter, Finite Impulse Response filter etc.Thisly analog signal is converted to mode that digital signal carries out processing and greatly can improve the processing accuracy of signal and avoid the interference that the interference of filtering median filter itself and other factors extraneous cause.
Described noise reduction output unit comprises multiple noise reduction horn, and these loudspeaker and described microphone position are arranged correspondingly.These noise reduction horn are for exporting the first de-noising signal (if any) and the second de-noising signal.
Described noise classification unit comprises memory, wave f orm analysis unit and sound characteristic comparing unit.Save multiple personnel vocal print separately and the corresponding relation with corresponding personnel thereof in memory in advance, include but not limited to: the vocal print of security personnel in the vocal print of lift attendant and/or building.These vocal prints can by vocal print acquisition device of the prior art or the acquisition such as vocal print storehouse apparatus for establishing or method, and be preserved in memory in the form of a file.Preferably, the data in this file are saved as reference vocal print matrix.Wave f orm analysis unit carries out voiceprint extraction to the signal of input noise taxon, and the result of extraction is saved as actual vocal print matrix, by this Output matrix to sound characteristic comparing unit by TES algorithm.The reference vocal print matrix prestored in actual vocal print matrix and memory compares by sound characteristic comparing unit, determines that sound that this is transfused to comprises the sound of existing personnel in which memory according to comparative result.Like this, the voiceprint of personal information and correspondence thereof can be preserved, be revised or delete to control unit just by arranging the sorting parameter of noise classification unit, and in memory.
The signal that noise classification unit exports is imported into switch matrix.Switch matrix comprises multiple passage, and each passage includes a switch that can control this passage and disconnect or close.Closing or opening of each switch is controlled by control unit.Like this, just optionally can be retained in actual environment by this switch matrix near the sound that sends of some personnel not to be taken as be noise (and being not dropped) or to be taken as be noise (and being dropped).The advantage done like this is that can realize retaining certain or some specific voice while initiatively eliminating other voice is not eliminated by by active noise reduction.
Described noise spectrum generation unit comprises FFT computing unit, and it carries out FFT computing according to the time-domain signal being input to noise spectrum generation unit, obtains the frequency spectrum of this input signal.
Described second anti-phase spectrum generation unit comprises anti-phase matrix generation unit, IFFT computing unit and waveform generator.Principle and the course of work of this second anti-phase spectrum generation unit and the first anti-phase spectrum generation unit are similar, and just in this second anti-phase spectrum generation unit, the matrixing unit of the first anti-phase spectrum generation unit is equivalent to IFFT computing unit and waveform generator.And in the second anti-phase spectrum generation unit, IFFT computing unit and waveform generator are separated mutually, contribute to improving the disposal ability for complicated spectrum signal, reduce the interference that the analogue device in processing procedure in waveform generator brings.It will be clear for those skilled in the art that this IFFT computing unit and waveform generator can unite two into one under the prerequisite meeting noise reduction required precision, adopt the matrixing unit in the first anti-phase spectrum generation unit.
Above-mentioned embodiment is only concrete case of the present invention; scope of patent protection of the present invention includes but not limited to above-mentioned embodiment; any claims according to the invention and any person of an ordinary skill in the technical field to its suitable change done or replacement, all should fall into scope of patent protection of the present invention.
Claims (8)
1. an active mode denoise device, this denoising device comprises multiple detecting unit and this denoising device is arranged in confined space for carrying out active noise reduction to the voice signal in this space, it is characterized in that, this denoising device also comprises the active mode denoise module be arranged near detecting unit, described active mode denoise module comprises control unit, Noise Acquisition unit, noise classification unit, switch matrix, Envelope Analysis unit, envelope processing unit, first anti-phase spectrum generation unit, noise spectrum generation unit, noise spectrum processing unit, second anti-phase spectrum generation unit, noise reduction output unit, each switch in described control unit control switch matrix closed or open and control the optimum configurations of unit described in other, described Noise Acquisition unit acquisition noise signal, noise classification unit is classified according to pre-defined rule to described noise signal, whether switch matrix for selecting the output of the noise signal after being classified, noise spectrum generation unit is used for composing the noise signal generted noise of switch Output matrix, noise spectrum processing unit is used for carrying out digitized processing to noise spectrum, second anti-phase spectrum generation unit produces the second de-noising signal according to the output of noise spectrum processing unit, noise reduction output unit is used for the second de-noising signal to launch, carry out superposing with noise signal and offset.
2. active mode denoise device according to claim 1, is characterized in that, described confined space is lift space.
3. active mode denoise device according to claim 1, is characterized in that, describedly carries out active noise reduction to the voice signal in this space and is: carry out active noise reduction to the voice signal of monitoring camera device collection.
4. active mode denoise device according to claim 3, is characterized in that, described detecting unit comprises noise reducing sound sensor.
5. active mode denoise device according to claim 1, it is characterized in that, whether described Envelope Analysis unit has repeatability for the envelope of the signal analyzing switch matrix output and wherein will have the signal output of repeated envelope, described envelope processing unit is used for carrying out digitlization according to the output of Envelope Analysis unit, and described first anti-phase spectrum generation unit produces the first de-noising signal according to the signal after digitlization.
6. active mode denoise device according to claim 1, is characterized in that, described denoising device also comprises solar cell, and this battery is that described active mode denoise module and detecting unit are powered.
7. active mode denoise device according to claim 1, is characterized in that, described confined space is the space that headset is formed.
8. active mode denoise device according to claim 7, is characterized in that, described detecting unit is noise reduction microphone.
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Cited By (5)
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| CN106251878A (en) * | 2016-08-26 | 2016-12-21 | 彭胜 | Meeting affairs voice recording device |
| CN109068250A (en) * | 2018-10-15 | 2018-12-21 | 维沃移动通信有限公司 | A kind of microphone and electronic equipment |
| 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 |
| CN110383798A (en) * | 2017-03-08 | 2019-10-25 | 三菱电机株式会社 | Acoustic signal processing device, acoustics signal processing method and hands-free message equipment |
| CN112556834A (en) * | 2020-12-11 | 2021-03-26 | 陈学良 | Urban noise alarm prediction system based on Internet of things |
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| US7020288B1 (en) * | 1999-08-20 | 2006-03-28 | Matsushita Electric Industrial Co., Ltd. | Noise reduction apparatus |
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| 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 |
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| CN112556834A (en) * | 2020-12-11 | 2021-03-26 | 陈学良 | Urban noise alarm prediction system based on Internet of things |
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| CN104936101B (en) | 2018-01-30 |
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