阅读说明：本技术 一种自由空间内电子消音处理方法 (Electronic silencing treatment method in free space ) 是由 杜思源 江亚翠 于 2019-12-31 设计创作，主要内容包括：本发明公开了一种自由空间内电子消音处理方法,包括以下步骤：S1.噪声信号采集：通过噪声采集传感器分别对噪声源头区域的原始噪声和控制区域的噪声进行采集,并转换成模拟信号；S2.模拟信号数字化处理和储存：通过A/D模数转换器把模拟信号转换成数字信号并储存在计算机里；S3.数字信号的分析与计算；S4.反相声波数字信号模拟化处理：把计算获得的反相声波信号转换为相应的模拟信号；S5.向控制区域播放反相声波信号：反相声波信号转换为模拟信号后通过扬声器向控制区域播放。本发明把采集,计算和发送反相声波这一过程分开独立进行,可避免控制算法自身的不足,并计算得出精准的结果,然后在特定时间向控制区域播放反相声波,可得到理想的降噪效果。(The invention discloses an electronic silencing treatment method in free space, which comprises the following steps: s1, noise signal acquisition: respectively collecting original noise of a noise source area and noise of a control area through a noise collecting sensor, and converting the original noise and the noise into analog signals; s2, analog signal digital processing and storage: converting the analog signal into a digital signal through an A/D (analog/digital) converter and storing the digital signal in a computer; s3, analyzing and calculating the digital signal; s4, inverse sound wave digital signal simulation treatment: converting the obtained inverse sound wave signal into a corresponding analog signal; s5, playing the reverse sound wave signal to the control area: and the reversed sound wave signal is converted into an analog signal and then is played to the control area through a loudspeaker. The invention separately and independently carries out the processes of collecting, calculating and sending the reverse sound wave, can avoid the deficiency of the control algorithm, obtains accurate results by calculation, and then plays the reverse sound wave to the control area at specific time, thereby obtaining ideal noise reduction effect.)

1. An electronic silencing treatment method in free space is characterized in that: the method comprises the following steps:

s1, noise signal acquisition: respectively collecting original noise of a noise source area and noise of a control area through a noise collecting sensor, and converting the original noise and the noise into analog signals;

s2, analog signal digital processing and storage: converting the analog signal into a digital signal through an A/D (analog/digital) converter and storing the digital signal in a computer;

s3, analyzing and calculating the digital signal: analyzing and calculating the digital signal stored in the computer to obtain a reverse sound wave signal;

s4, performing inverse acoustic wave digital signal simulation: converting the obtained inverse sound wave signal into a corresponding analog signal;

s5, playing the reverse sound wave signal to the control area: and the reversed phase sound wave signal is converted into an analog signal and then is played to the control area through the loudspeaker, so that the purpose of noise reduction is realized.

2. The method of claim 1, wherein the method comprises the steps of: the model of the noise collection sensor in the step S1 is a real-time spectrum noise sensor of ZX29/CRY 2012.

3. The method of claim 1, wherein the method comprises the steps of: the digital signal stored in the computer in the step S3 is calculated and stored bidirectionally by the DSP digital processor, the information calculated and stored by the computer is transmitted to the D/a digital-to-analog converter in a digital signal manner, the digital signal is processed by the D/a digital-to-analog converter to obtain an analog signal, and the analog signal is transmitted to the speaker to play and release the reverse sound wave to the control area.

4. The method of claim 1, wherein the method comprises the steps of: and (4) simultaneously collecting the noise in the control area again by using the error correction sensor in the step (S5), processing the noise into an analog signal, transmitting the analog signal to the D/A digital-to-analog converter, converting the analog signal into a digital signal by the D/A digital-to-analog converter, transmitting the digital signal to the computer again, and performing step (S3) cyclic processing to continuously perform cyclic noise reduction processing on the noise in the control area.

5. The method of claim 1, wherein the method comprises the steps of: the computer is electrically connected with the A/D analog-to-digital converter, the D/A digital-to-analog converter and the DSP digital processor, digital signal transmission is performed between the computer and the A/D analog-to-digital converter and the D/A digital-to-analog converter, the A/D analog-to-digital converter is electrically connected with the noise acquisition sensor, the D/A digital-to-analog converter is electrically connected with the loudspeaker, and the error correction sensor is electrically connected with the D/A digital-to-analog converter and is used for analog signal transmission.

Technical Field

The invention relates to the technical field of industrial environment noise reduction, in particular to an electronic noise reduction processing method in a free space.

Background

The noise control method mainly comprises a passive noise reduction technology and an active noise reduction technology, wherein the passive noise reduction technology is used for controlling medium-high frequency noise with short wavelength, and sound energy is consumed through interaction of noise sound waves and acoustic materials or acoustic structures, so that the purpose of reducing noise is achieved. The medium-high frequency noise reduction device has good medium-high frequency noise reduction performance and can play an obvious noise reduction effect in a wide range. However, due to the thickness and volume of the material, it is difficult to control the low frequency noise by the passive noise reduction method.

The existing active noise reduction technology analyzes and processes noise in real time, is used for controlling low-frequency noise with longer wavelength and stability, acquires and calculates noise signals, and then sends out reverse sound waves to offset original sound waves, so that the purpose of reducing or suppressing noise is achieved, and the active noise reduction technology has a good low-frequency noise control effect and is widely applied to earphones, automobiles and enclosed spaces. However, when active noise reduction techniques are used to handle industrial environmental noise, the following challenges are faced: free space noise has multiple sound sources, wide distribution range and non-directional transmission, so that the sensor is difficult to capture; the wavelength of the medium-high frequency noise is short, the change is large, the acquisition, analysis and calculation processes of the system have time delay, and the calculation result has large deviation with the original noise signal; the anti-interference capability of the system is poor, the control algorithm has limitations, and the nonlinear signal and the time-varying signal cannot be processed, so that an electronic noise reduction processing method in a free space is provided.

Disclosure of Invention

The invention aims to provide an electronic noise reduction processing method in a free space, which aims to solve the problem of the defects of the existing active noise reduction technology in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an electronic silencing treatment method in free space comprises the following steps:

s1, noise signal acquisition: respectively collecting original noise of a noise source area and noise of a control area through a noise collecting sensor, and converting the original noise and the noise into analog signals;

s2, analog signal digital processing and storage: converting the analog signal into a digital signal through an A/D (analog/digital) converter and storing the digital signal in a computer;

s3, analyzing and calculating the digital signal: analyzing and calculating the digital signal stored in the computer to obtain a reverse sound wave signal;

s4, inverse sound wave digital signal simulation treatment: converting the obtained inverse sound wave signal into a corresponding analog signal;

s5, playing the reverse sound wave signal to the control area: and the reversed phase sound wave signal is converted into an analog signal and then is played to the control area through the loudspeaker, so that the purpose of noise reduction is realized.

Preferably, the noise collection sensor in step S1 is a real-time spectrum noise sensor with a model of ZX29/CRY 2012.

Preferably, the digital signal stored in the computer in step S3 is calculated and stored bidirectionally by the DSP digital processor, the information calculated and stored by the computer is transmitted to the D/a digital-to-analog converter in a digital signal manner, the digital signal is processed by the D/a digital-to-analog converter to obtain an analog signal, and the analog signal is transmitted to the speaker to play and release the inverse sound wave to the control area.

Preferably, in step S5, the noise in the control area is collected again by the error correction sensor, processed into an analog signal, transmitted to the D/a digital-to-analog converter, converted into a digital signal by the D/a digital-to-analog converter, and transmitted to the computer again, and the process proceeds to step S3 for loop processing, and performs continuous loop noise reduction processing on the noise in the control area.

Preferably, the computer is electrically connected to the a/D analog-to-digital converter, the D/a digital-to-analog converter and the DSP digital processor, and the computer is in digital signal transmission with the a/D analog-to-digital converter and the D/a digital-to-analog converter, and the a/D analog-to-digital converter is in electrical connection with the noise collection sensor, the D/a digital-to-analog converter is in electrical connection with the speaker, and the error correction sensor is in analog signal transmission with the D/a digital-to-analog converter.

Compared with the prior art, the invention has the beneficial effects that:

1. the noise with various frequency characteristics can be processed, and compared with the existing active noise reduction technology, the frequency range capable of being processed is wider;

2. the production efficiency of products is improved, the labor conditions of workshop workers are improved, good labor conditions are created for the workshop workers, the production efficiency is improved, the number of products produced in unit time is increased, and the labor hour consumption is reduced; occupational diseases caused by noise are reduced, and related medical expenses are reduced;

3. the device has good economic and social development prospects, can develop towards the commercialization direction, and has the advantages of small volume, low cost, high efficiency and low maintenance cost; is beneficial to realizing an efficient, continuous and healthy production mode and promoting the sustainable development of economy and environment.

In summary, the process of collecting, calculating and sending the inverse sound waves is separately and independently performed, the type and the characteristics of noise generated in a specific time are always kept unchanged in the same industrial environment, the process of collecting, calculating and sending the inverse sound waves is separately and independently performed, the self-deficiency of a control algorithm can be avoided, an accurate result is obtained through calculation, then the inverse sound waves are played to a control area in a specific time, and an ideal noise reduction effect can be obtained.

Drawings

FIG. 1 is a schematic flow chart of the electronic silencing treatment method in free space according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: an electronic silencing treatment method in free space comprises the following steps:

s1, noise signal acquisition: respectively collecting original noise of a noise source area and noise of a control area through a noise collecting sensor, and converting the original noise and the noise into analog signals;

s2, analog signal digital processing and storage: converting the analog signal into a digital signal through an A/D (analog/digital) converter and storing the digital signal in a computer;

s3, analyzing and calculating the digital signal: analyzing and calculating the digital signal stored in the computer to obtain a reverse sound wave signal;

s4, inverse sound wave digital signal simulation treatment: converting the obtained inverse sound wave signal into a corresponding analog signal;

s5, playing the reverse sound wave signal to the control area: and the reversed phase sound wave signal is converted into an analog signal and then is played to the control area through the loudspeaker, so that the purpose of noise reduction is realized.

The noise acquisition sensor in step S1 is a real-time spectrum noise sensor of type ZX29/CRY2012, the digital signal stored in the computer in step S3 is bidirectionally calculated and stored by the DSP digital processor, the information calculated and stored by the computer is transmitted to the D/a digital-to-analog converter in a digital signal manner, the digital signal is processed by the D/a digital-to-analog converter to obtain an analog signal, the analog signal is transmitted to the speaker to play and release the reverse sound wave to the control area, the noise in the control area in step S5 is collected again by the error correction sensor at the same time, the noise is processed into an analog signal and transmitted to the D/a digital-to-analog converter, the analog signal is converted into a digital signal by the D/a digital-to be transmitted to the computer again, the step S3 is performed for loop noise reduction, and the noise in the control area is continuously performed for loop noise reduction, the computer is electrically connected with the A/D analog-to-digital converter, the D/A digital-to-analog converter and the DSP digital processor, digital signal transmission is performed between the computer and the A/D analog-to-digital converter and between the computer and the D/A digital-to-analog converter, the A/D analog-to-digital converter is electrically connected with the noise acquisition sensor, the D/A digital-to-analog converter is electrically connected with the loudspeaker, the error correction sensor is electrically connected with the D/A digital-to-analog converter, the noise acquisition sensor is electrically connected with the noise acquisition sensor, the D/A digital-to-analog converter is electrically connected with the loudspeaker, the error correction sensor is electrically connected with the D/A digital-to-analog converter, the noise.

In summary, compared with the prior art, the process of collecting, calculating and sending the inverse sound waves is separately and independently carried out, the type and the characteristics of the noise generated in a specific time are always kept unchanged in the same industrial environment, the process of collecting, calculating and sending the inverse sound waves is separately and independently carried out, the defect of a control algorithm can be avoided, an accurate result is obtained through calculation, then the inverse sound waves are played to a control area in a specific time, and an ideal noise reduction effect can be obtained;

the noise with various frequency characteristics can be processed, and compared with the existing active noise reduction technology, the frequency range capable of being processed is wider; the production efficiency of products is improved, the labor conditions of workshop workers are improved, good labor conditions are created for the workshop workers, the production efficiency is improved, the number of products produced in unit time is increased, and the labor hour consumption is reduced; occupational diseases caused by noise are reduced, and related medical expenses are reduced; the device has good economic and social development prospects, can develop towards the commercialization direction, and has the advantages of small volume, low cost, high efficiency and low maintenance cost; is beneficial to realizing an efficient, continuous and healthy production mode and promoting the sustainable development of economy and environment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.