CN102097100A - Device and method for reducing steady-state noises through adding noises - Google Patents
Device and method for reducing steady-state noises through adding noises Download PDFInfo
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- CN102097100A CN102097100A CN201110002357XA CN201110002357A CN102097100A CN 102097100 A CN102097100 A CN 102097100A CN 201110002357X A CN201110002357X A CN 201110002357XA CN 201110002357 A CN201110002357 A CN 201110002357A CN 102097100 A CN102097100 A CN 102097100A
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Abstract
The invention provides a device for reducing steady-state noises through adding noises, which comprises an audio input unit, a noise generating unit, a synthesis unit and a noise removing unit, wherein the audio input unit is used for inputting audio signals containing noises; the noise generating unit is used for generating noise signals with specific rules; the synthesis unit is used for synthesizing the audio signals and the noise signals and transmitting the synthesized signals to the noise removing unit; and the noise removing unit is used for removing the noise signals with specific rules and then outputting the audio signals. In the invention, by means of a noise adding method, the purposefully added noises with rules are used for submerging the noises in the audio signals and can be removed from the audio signals, and after the noises are submerged, the added noises can be removed so as to achieve the effect of removing the noises.
Description
Technical field
The present invention relates to the noise treatment device and method, a kind of device and method that reduces the stable state noise of saying so exactly.
Background technology
In the gatherer process of communication facilities to audio frequency, will inevitably be doped with environmental noise, for example people can be doped with the sound of automobile, others' brouhaha of sound, surrounding environment in a minute when the outdoor use mobile phone communication, and this all can have influence on calling quality.
And in present Audio Signal Processing process, be reluctant for these noises, because the voice that the people sent, its frequency range is positioned at the frequency range of the noise of environment, abate the noise, will people's voice be eliminated together, otherwise, will inevitably contain noise.
Traditional sound signal denoise processing method is to utilize Fourier transform, and noisy sound signal is transformed into frequency domain, carries out filtering and noise reduction then.Method as patented claim CN200510089148.8, but owing to comprise a large amount of audio files in the audio frequency, it is not a simple audio curve, need a large amount of resources could realize handling by Fourier transform, and Fourier transform is handled the processing of high frequency noise certain effect is arranged, noise to low frequency but is difficult to handle, and can't obtain satisfied result.
Summary of the invention
Find after deliberation, the frequency of most of noise is to be in a specific scope, be usually located between the 50-85 decibel as common noise around us, these noises can be flooded by other sound, therefore can in this way the noise in the sound signal be flooded, thereby reach the effect that abates the noise.
Based on this, the purpose of this invention is to provide a kind of device and method that reduces the stable state noise, this device and method floods original noise by adding noise, thereby reaches the effect that reduces the stable state noise.
It is a kind of by adding the device and method that noise reduces the stable state noise that another object of the present invention is to provide, and this device and method is realized simply, treatment effect is obvious, can consume the stable state noise in the sound signal effectively.
In order to achieve the above object, the present invention is achieved in that
A kind of by adding the device that noise reduces the stable state noise, it comprises audio frequency input block, noise generation unit, synthesis unit and eliminates element of noise; Described audio frequency input block is used to import the sound signal that includes noise, the noise generation unit generates the noise signal of ad hoc rules, synthesis unit synthesizes sound signal and noise signal, and synthetic signal is transferred to the elimination element of noise, eliminate the laggard line output of noise signal that element of noise is eliminated ad hoc rules.
Described synthesis unit has two, and the audio frequency that corresponds respectively to left and right sound channels is synthetic.
In the described device, also comprise the smoothing processing module, eliminate the sound signal of element of noise output and carry out exporting again after the smoothing processing, to have the good effect that abates the noise through the smoothing processing module.
A kind of by adding the method that noise reduces the stable state noise, this method comprises the steps:
1, obtains sound signal; Obtain sound signal by the audio frequency input block;
2, generate noise; The noise generation unit generates noise signal according to specific rule;
3, sound is synthetic; Sound signal and noise signal are synthesized;
4, abate the noise; Eliminate noise processed by eliminating element of noise, remove the noise signal that the noise generation unit is generated;
5, output.
In the described step 1, described sound signal comprises left channel audio signal and right channel audio signal two paths of signals.
In the described step 2, described noise signal comprises L channel noise signal and R channel noise signal two paths of signals.
In the described step 2, the noise signal that is generated is the combination of any one or two kinds of white noise signal and pink colour noise signal.
In the described step 3, divide L channel and R channel, respectively left channel audio signal and L channel noise signal, right channel audio signal and R channel noise signal are synthesized by two synthesis units, the noise about making in two sound channel sound intermediate frequency signals is flooded by the noise signal that is generated.
In the described step 4, also comprise the smoothing processing step, the smoothing processing step comprises that again interpolation is level and smooth and trend is level and smooth, interpolation smoothly is earlier sound signal to be carried out staging treating, every segment length is taken as 1024, the not enough zero padding of final stage utilizes the main peak value of every piecewise analysis to come the reconstruct audio curve again, uses linear interpolation algorithm to come smooth waveform at last; Trend is level and smooth, is audio curve is got 5 points, carries out 5 linear slide average algorithms and carries out smoothly.
The sound signal of L channel and R channel is after the elimination element of noise is eliminated the noise signal that is generated, and the sound signal of each sound channel divides 2 the tunnel to carry out smoothing processing, and one the tunnel carries out the interpolation smoothing processing, and one the tunnel carries out the trend smoothing processing.
In above-mentioned step, audio frequency after interpolation, the trend smoothing processing and synthetic 1 tunnel sound signal are exported.
The present invention is by adding the way of noise, with the noise that is added the noise in the sound signal is flooded, and the noise that is added is purposive interpolation, be well-regulated, can from sound signal, remove, after flooding noise, the noise that is added can be cut, thereby reach the effect that abates the noise.
Simple in structure, realization convenience, with low cost that the present invention realized can be applicable in the various communication facilitiess.
Description of drawings
Fig. 1 is a structural representation of the invention process.
Fig. 2 is the schematic diagram of institute of the present invention implementation method.
Fig. 3 is the control flow chart that the present invention implemented.
Embodiment
Shown in accompanying drawing, concrete enforcement of the present invention is elaborated.
Shown in Figure 1, realize that basic structure of the present invention comprises input audio signal module, noise generation module, synthesis module and denoising Processing module, wherein, the input audio signal module is used to import the sound signal that includes noise, the noise generation module generates the noise signal of ad hoc rules, synthesis module synthesizes sound signal and noise signal, and synthetic signal is transferred to the denoising Processing module, and the denoising Processing module is eliminated the laggard line output of noise signal of ad hoc rules.
Input audio signal module and noise generation module divide L channel and R channel two-way to add respectively by two synthesis modules sound signal and the noise signal that is generated, eliminate the noise that is added by the denoising Processing module again after adding noise, carry out the output of left and right acoustic channels.Among Fig. 1, L is an input L channel audio frequency, R is the input right audio channel, nL generates L channel noise audio frequency, nR generates R channel noise audio frequency, and sL is a synthetic back L channel audio frequency, and sR is a synthetic back right audio channel, cL adds L channel audio frequency behind the noise reduction of making an uproar, and cR adds right audio channel behind the noise reduction of making an uproar.
For the noise that is added, normally white noise and pink colour noise is a kind of.
White noise (White noise) is that a kind of power spectrum density is the random signal or the stochastic process of constant.That is, the power of this signal on each frequency range is the same.
The pink noise is referred to as frequency inverse ratio (1/f) noise again, because its energy distribution and frequency are inversely proportional to, or perhaps each octave (Octave) energy 3 dB that just fail.
During for numerous and diverse sound, just can select for use these two kinds of sound to be covered on every side.In general, you can select white noise for use under the common situation, and pink noise then is special masking material at voice.
In conjunction with Fig. 2, shown in Figure 3, step of the invention process is as follows.
1, obtains sound signal; By audio frequency input block input audio signal, sound signal comprises left channel audio signal and right channel audio signal two paths of signals.
2, generate noise; The noise generation unit generates noise signal according to specific rule, and noise signal comprises L channel noise signal and R channel noise signal two paths of signals; And noise signal carried out the amplitude adjustment, synthetic to be fit to follow-up sound.
3, sound is synthetic; Noise signal and sound signal are mixed, and synthesis module synthesizes left channel audio signal and L channel noise signal, and right channel audio signal and R channel noise signal synthesize.
4, abate the noise; Signal after synthetic is eliminated noise processed by eliminating element of noise, removes the noise signal that the noise generation unit is generated.
5, level and smooth Audio Processing; Noise reduction sound signal later has certain loss in the middle of the process of de-noising, therefore will carry out smoothing processing to sound signal behind noise reduction.
The smoothing processing step comprises that again interpolation is level and smooth and trend is level and smooth, interpolation smoothly is earlier sound signal to be carried out staging treating, and every segment length is taken as 1024, the not enough zero padding of final stage, utilize the main peak value of every piecewise analysis to come the reconstruct audio curve again, use linear interpolation algorithm to come smooth waveform at last; Trend is level and smooth, is audio curve is got 5 points, carries out 5 linear slide average algorithms and carries out smoothly.
The sound signal of L channel and R channel is after the elimination element of noise is eliminated the noise signal that is generated, the sound signal of each sound channel divides 2 the tunnel to carry out smoothing processing, one the tunnel carries out the interpolation smoothing processing, one the tunnel carries out the trend smoothing processing, and audio frequency after interpolation, the trend smoothing processing and synthetic 1 tunnel sound signal are exported.
6, gain-adjusted; Out-of-limit in order to prevent after the Audio Processing, also can carry out suitable adjustment to the audio gain of out-of-limit part by the automatic gain processing module.
7, audio frequency output.
Like this, the present invention adds the denoising Processing of making an uproar to the sound signal in the communication facilities through real-time and dynamic, can level and smooth dynamically input audio signal, and part suppress and eliminate around the environment sound, make people's conversation more clear, avoid the interference of external noise.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. one kind by adding the device that noise reduces the stable state noise, it is characterized in that this device comprises audio frequency input block, noise generation unit, synthesis unit and eliminates element of noise; Described audio frequency input block is used to import the sound signal that includes noise, the noise generation unit generates the noise signal of ad hoc rules, synthesis unit synthesizes sound signal and noise signal, and synthetic signal is transferred to the elimination element of noise, eliminate the laggard line output of noise signal that element of noise is eliminated ad hoc rules.
2. as claimed in claim 1 by adding the device that noise reduces the stable state noise, it is characterized in that described synthesis unit has two, the audio frequency that corresponds respectively to left and right sound channels is synthetic.
3. as claimed in claim 1 by adding the device that noise reduces the stable state noise, it is characterized in that in the described device, also comprise the smoothing processing module, eliminate the sound signal of element of noise output and carry out exporting again after the smoothing processing, to have the good effect that abates the noise through the smoothing processing module.
4. one kind by adding the method that noise reduces the stable state noise, it is characterized in that this method comprises the steps:
1), obtains sound signal; Obtain sound signal by the audio frequency input block;
2), generate noise; The noise generation unit generates noise signal according to specific rule;
3), sound is synthetic; Sound signal and noise signal are synthesized;
4), abate the noise; Eliminate noise processed by eliminating element of noise, remove the noise signal that the noise generation unit is generated;
5), output.
5. as claimed in claim 4 by adding the method that noise reduces the stable state noise, it is characterized in that in the described step 1) that described sound signal comprises left channel audio signal and right channel audio signal two paths of signals.
6. as claimed in claim 4 by adding the method that noise reduces the stable state noise, it is characterized in that described step 2) in, described noise signal comprises L channel noise signal and R channel noise signal two paths of signals.
7. as claimed in claim 4 by adding the method that noise reduces the stable state noise, it is characterized in that described step 2) in, the noise signal that is generated is the combination of any one or two kinds of white noise signal and pink colour noise signal.
8. as claimed in claim 4 by adding the method that noise reduces the stable state noise, it is characterized in that in the described step 3), divide L channel and R channel, respectively left channel audio signal and L channel noise signal, right channel audio signal and R channel noise signal are synthesized by two synthesis units, the noise about making in two sound channel sound intermediate frequency signals is flooded by the noise signal that is generated.
9. as claimed in claim 4 by adding the method that noise reduces the stable state noise, it is characterized in that in the described step 4), also comprise the smoothing processing step, the smoothing processing step comprises that again interpolation is level and smooth and trend is level and smooth, interpolation smoothly is earlier sound signal to be carried out staging treating, and every segment length is taken as 1024, the not enough zero padding of final stage, utilize the main peak value of every piecewise analysis to come the reconstruct audio curve again, use linear interpolation algorithm to come smooth waveform at last; Trend is level and smooth, is audio curve is got 5 points, carries out 5 linear slide average algorithms and carries out smoothly;
Wherein, the sound signal of L channel and R channel is after the elimination element of noise is eliminated the noise signal that is generated, and the sound signal of each sound channel divides 2 the tunnel to carry out smoothing processing, and one the tunnel carries out the interpolation smoothing processing, and one the tunnel carries out the trend smoothing processing;
After the smoothing processing, audio frequency after interpolation, the trend smoothing processing and synthetic 1 tunnel sound signal are exported.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106730194A (en) * | 2016-11-28 | 2017-05-31 | 深圳融昕医疗科技有限公司 | Lung ventilator and its control method with decrease of noise functions |
| CN106887235A (en) * | 2015-12-16 | 2017-06-23 | 芋头科技（杭州）有限公司 | A kind of voice de-noising method and intelligent electronic device |
| WO2018153243A1 (en) * | 2017-02-21 | 2018-08-30 | 比亚迪股份有限公司 | Masking method and device for motor high-frequency noise |
| CN109672959A (en) * | 2018-12-24 | 2019-04-23 | 维沃移动通信有限公司 | A kind of signal processing method, terminal device and computer readable storage medium |
| WO2021027132A1 (en) * | 2019-08-12 | 2021-02-18 | 平安科技（深圳）有限公司 | Audio processing method and apparatus and computer storage medium |
-
2011
- 2011-01-07 CN CN201110002357XA patent/CN102097100A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887235A (en) * | 2015-12-16 | 2017-06-23 | 芋头科技（杭州）有限公司 | A kind of voice de-noising method and intelligent electronic device |
| CN106730194A (en) * | 2016-11-28 | 2017-05-31 | 深圳融昕医疗科技有限公司 | Lung ventilator and its control method with decrease of noise functions |
| WO2018153243A1 (en) * | 2017-02-21 | 2018-08-30 | 比亚迪股份有限公司 | Masking method and device for motor high-frequency noise |
| CN109672959A (en) * | 2018-12-24 | 2019-04-23 | 维沃移动通信有限公司 | A kind of signal processing method, terminal device and computer readable storage medium |
| WO2021027132A1 (en) * | 2019-08-12 | 2021-02-18 | 平安科技（深圳）有限公司 | Audio processing method and apparatus and computer storage medium |
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Application publication date: 20110615 |