CN101614584B - Noise measuring system based on digital signal processing and method - Google Patents
Noise measuring system based on digital signal processing and method Download PDFInfo
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- CN101614584B CN101614584B CN 200910108793 CN200910108793A CN101614584B CN 101614584 B CN101614584 B CN 101614584B CN 200910108793 CN200910108793 CN 200910108793 CN 200910108793 A CN200910108793 A CN 200910108793A CN 101614584 B CN101614584 B CN 101614584B
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Abstract
The invention discloses a noise measuring system based on digital signal processing and a method; the system comprises a microphone, an amplifier, an AD sampling module, a digital signal processor and a singlechip which are sequentially connected; the microphone is used for collecting sound signals and converts the sound signals to analog voltage signals; the amplifier is used for reducing the impedance of the voltage signals so as to obtain low impedance voltage signals; the AD sampling module converts the low impedance voltage signals to the digital signals; the singlechip is used for obtaining calculating parameters needed by sound pressure level calculation and issues interrupt signals to the digital signal processor; and the digital signal processor is used for responding the interrupt signals, and carrying out sound pressure level calculation on the digital signals to obtain sound pressure level. The noise measuring system based on DSP and the method provided by the invention have simple hardware connection, easy realized arithmetic, wide dynamic range and high measuring accuracy.
Description
Technical field
The present invention relates to a kind of Digital Noise measuring system, especially relate to a kind of noise measurement system based on digital signal processing and method.
Background technology
Traditional noise measurement system as shown in Figure 1, is to adopt mimic channel to realize signal filtering, sound pressure level algorithm and weighting network, and its arithmetic speed is slow, precision is low, dynamic range is little, power consumption is large, and function singleness.
in recent years, fast development along with microelectronics and integrated circuit, some Digital Noise measuring systems have appearred, it compares traditional noise measurement system arithmetic speed, precision, dynamic range all increases, but because the structure of the noise measurement system that designs is different, for example, the processor of selecting mostly is the relatively poor processors of some digital signal processing capability such as single-chip microcomputer, and the sample frequency scope of AD sampling module is little, sampling precision is low etc., and still use time weighting network and the octave analysis module of simulation in system, when realizing noise measurement, algorithm is complicated, dynamic range is little, the frequency range of measured signal is restriction to some extent also, and precision is difficult to meet the demands.
Therefore, be necessary prior art is improved.
Summary of the invention
The object of the invention is to, for the above-mentioned shortcoming of prior art, provide a kind of hardware connect simple, algorithm is realized easily, dynamic range is large, measuring accuracy is high, and Digital Noise measuring system and the method based on DSP of attainable feature richness.
Technical scheme of the present invention is:
A kind of noise measurement system based on digital signal processing is provided, wherein, has comprised the microphone, amplifier, AD sampling module, digital signal processor and the single-chip microcomputer that connect successively, wherein,
Described microphone is used for collected sound signal and is translated into the voltage signal of simulation;
Described amplifier for reducing described voltage signal impedance, obtains voltage signal in low impedance;
Described AD sampling module is used for converting described voltage signal in low impedance to digital signal;
Described single-chip microcomputer is used for the input sound pressure level and calculates required calculating parameter, and shows the sound pressure level that calculates;
Described digital signal processor is used for responding described look-at-me, and sampled digital signal according to described calculating parameter selection analysis pattern, carries out the sound pressure level analytical calculation to described digital signal, obtains sound pressure level, and sound pressure level is sent to described single-chip microcomputer demonstration; Described analytical model comprises octave analysis and fft analysis, wherein:
Described octave analysis comprises: 4096 digital signal datas of sampling; Initialization octave analysis result store district first by the bandpass filter of 20KHz, calculates the quadratic sum of 4096 filtering results with all digital signals, and the line linearity of going forward side by side is average; Extract recombination signal by 1/2 again, the digital band-pass filter that digital signal is cycled through preset frequency carries out filtering, ask quadratic sum and carry out linear averaging, comprise successively the bandpass filter of 16KHz, the bandpass filter of 12.5KHz and the bandpass filter of 10KHz, after end product is passed through the low-pass filter of 10KHz, calculate the population mean after each band-pass filter, and calculate each sound control and overall sound pressure level; Again digital signal is carried out 1/2 and extract to carry out the filtering of next round; Each filtering result of calculation all is stored in octave analysis result store district, uses in order to follow-up operational analysis; Set cycle index i=10, when i 〉=10, produce when interrupting until timer overflows, stop octave analysis, utilize the data that are kept in octave analysis result store district to calculate equivalent sound pressure level, the statistics sound pressure level;
When described analytical model is fft analysis, comprising: set predetermined analysis time, and sampled digital signal; Described digital signal is carried out the FFT conversion, obtain signal spectrum, energy spectrum, one-sided power spectrum, obtain the spectra of sound pressure of noise signal by one-sided power spectrum, calculate the sound pressure level of each Frequency point according to the formula that calculates sound pressure level; Calculate the sound pressure level value of each Frequency point, and draw sound press level spectrum, calculate overall sound pressure level by the decibel summation operation.Noise measurement system of the present invention, wherein, it is inner that described AD sampling module is arranged at described digital signal processor; Described amplifier comprises prime amplifier and programmable amplifier, wherein,
Described prime amplifier is used for described voltage signal is carried out impedance transformation, and the high impedance voltage signal is become voltage signal in low impedance;
Described programmable amplifier be used for adjusting described voltage signal in low impedance size according to the full scale value of described AD sampling module, and the signal after processing sends to described AD sampling module.
Noise measurement system of the present invention, wherein, described AD sampling module is connected between described digital signal processor and described amplifier; Described amplifier is prime amplifier, is used for described voltage signal is carried out impedance transformation, the high impedance voltage signal is become voltage signal in low impedance, and send to described AD sampling module.
Noise measurement system of the present invention wherein, is connected with external memory storage on described digital signal processor, is used for storing described result of calculation.
Noise measurement system of the present invention wherein, is connected with keyboard on described single-chip microcomputer, is used for inputting described digital signal processor and carries out the needed calculating parameter of sound pressure level computational analysis, comprises time weighted mode, Measuring Time or display mode.
Noise measurement system of the present invention wherein, is connected with level shifting circuit between described single-chip microcomputer and described digital signal processor, and adopts the SCI agreement to communicate.
A kind of noise measuring method based on digital signal processing comprises the following steps:
A, obtain voice signal, and be translated into the voltage signal of simulation, reduce described voltage signal impedance, convert the voltage signal in low impedance that obtains to digital signal;
B, the needed calculating parameter of sound pressure level computational analysis is set, has judged whether interrupt request, when interrupt request is arranged, the described digital signal of sampling;
C, according to calculating parameter selection analysis pattern, described digital signal is carried out the sound pressure level analytical calculation, obtain sound pressure level; The described octave analysis of described analytical model and fft analysis; When analytical model is octave analysis, comprise the following steps:
C1, sampled digital signal;
C2, the digital band-pass filter that described digital signal is cycled through preset frequency carry out filtering;
C3, according to the filtering result, calculate the population mean of the bandpass filtering value of all digital signals, and calculate each sound control and overall sound pressure level.
Noise measuring method of the present invention wherein, in described step C, when described analytical model is fft analysis, comprises the following steps:
Analysis time is scheduled in C11, setting, and sampled digital signal;
C12, described digital signal is carried out the FFT conversion, obtain signal spectrum, energy spectrum, one-sided power spectrum, obtain the spectra of sound pressure of noise signal by one-sided power spectrum, calculate the sound pressure level of each Frequency point according to the formula that calculates sound pressure level;
C13, calculate the sound pressure level value of each Frequency point, and draw sound press level spectrum, calculate overall sound pressure level by the decibel summation operation.
Noise measuring method of the present invention, wherein, when there is no interrupt request, sampled digital signal calculates instantaneous sound pressure level and equivalent sound pressure level.
The present invention is by adopting DSP as APU, given full play to the powerful digital signal processing capability of DSP, not only realize the calculating of sound pressure level, realize simultaneously octave analysis, filtering processing, frequency weighted, time weighted etc., omitted the simulation weighting network, the mimic channels such as analog filtering device, make apparatus structure simple, power-dissipation-reduced, intrinsic noise reduces simultaneously, the more important thing is that measuring accuracy of the present invention is high, dynamic range is large.
Description of drawings
Fig. 1 is the structural representation of noise measurement system in prior art;
Fig. 2 is the structural representation of the noise measurement system one of the embodiment of the present invention;
Fig. 3 is the structural representation of the noise measurement system two of the embodiment of the present invention;
Fig. 4 is the noise measuring method overview flow chart of the embodiment of the present invention;
Fig. 5 is the octave analysis modular program process flow diagram of the embodiment of the present invention;
Fig. 6 is the fft analysis modular program process flow diagram of the embodiment of the present invention;
Fig. 7 is the time weighted implementation procedure figure of the embodiment of the present invention;
Fig. 8 is the equivalent circuit diagram of the time weighted of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, will be described in detail preferred embodiment of the present invention.
The noise measurement system structure that the embodiment of the present invention one provides comprises the microphone 110, amplifier, digital signal processor (DSP) 150 and the single-chip microcomputer 180 that connect successively as shown in Figure 2.Wherein, microphone 110 is used for obtaining voice signal and being translated into voltage signal.Can connect the external memory storage 160 that is used for storage sound pressure level result of calculation on digital signal processor 150.AD sampling module 140 is arranged on digital signal processor 150 inside, is used for analoging sound signal is converted to digital signal.Amplifier can comprise for voice signal being carried out the prime amplifier 120 of impedance transformation, and the range that can adapt to the AD sampling module amplifies the programmable amplifier 130 that dwindles processing to voice signal.The characteristics of this scheme are AD sampling module and the peripheral circuits that utilizes DSP to carry, and realize the collection of signal, and are connected with DSP by single-chip microcomputer and realize that keyboard input and Liquid Crystal Module show.
In the present embodiment, also can connect keyboard 170 and have the liquid crystal display 190 of graphical Presentation Function on single-chip microcomputer 180, keyboard 170 is connected with single-chip microcomputer 180 with the interruption form, the human-computer interaction function such as carry out that function selection and Measuring Time, measurement pattern arrange, set content will show on liquid crystal display 190 simultaneously.
Wherein, the function that can input by keyboard 170 mainly contains that weighted mode (A, C, Z) is selected, time weighted mode (F, S, I) is selected, Measuring Time is set, select display mode, save data to arrange etc., and liquid crystal display coordinates the requirement of keyboard to show.When having button to press on keyboard, single-chip microcomputer is judged user's demand according to the button that is pressed, simultaneously send out interrupt request to DSP, DSP responds interruption, measure calculating according to the demand of user key-press setting, and result of calculation is sent to single-chip microcomputer 180, single-chip microcomputer 180 is presented at result on liquid crystal display 190.When pressing without button, default algorithm is: measure the instantaneous sound pressure level in A weighted mode, the equivalent sound pressure level that carried out 10 minutes is measured, and instantaneous sound pressure level, equivalent sound pressure level, statistics sound pressure level, maximum sound pressure level, minimal sound pressure levels are presented on liquid crystal display.
Wherein measure computation process as follows: obtain voice signal and be translated into the voltage signal of simulation by microphone 110, then 120 pairs of these voltage signals of prime amplifier carry out impedance transformation, and the high impedance voltage signal is changed over voltage signal in low impedance output; Then in the high impedance voltage signal access programmable amplifier 130 with output, according to the range of AD sampling module 140, this high impedance voltage signal is amplified and dwindle processing, output is near the voltage signal of AD sampling module full scale (as: 3V); Again this voltage signal is sent into the AD sampling module of digital signal processor 150, analog voltage signal is converted into digital signal; Process this digital signal by respective algorithms again, comprise the calculating sound pressure level, frequency weighted, time weighted and signal is carried out octave analysis etc.; Calculation results is saved in external memory storage 160 again, according to the content that required demonstration is set, will shows that data send to single-chip microcomputer 180 simultaneously, single-chip microcomputer 180 should show that data were sent to liquid crystal display 190 and show again.
The noise measurement system structure of the embodiment of the present invention two is comprised of the microphone 210, prime amplifier 220, AD sampling module 240, digital signal processor 250 and the single-chip microcomputer 280 that connect successively as shown in Figure 3.Wherein microphone 210 is used for obtaining voice signal, and is translated into voltage signal.Can connect the external memory storage 260 that is used for storage sound pressure level result of calculation on digital signal processor 250.Different from embodiment one is that in the present embodiment, the external AD sampling module of digital signal processor is converted to digital signal with analog voltage signal; Also therefore omitted the programmable amplifier in embodiment one, directly adopted 220 pairs of voice signals of prime amplifier to carry out impedance transformation, and the voice signal access AD sampling module 240 that will carry out after impedance transformation carries out analog to digital conversion.
Identical with embodiment one is, embodiment two also can connect keyboard 270 and have the liquid crystal display 290 of graphical Presentation Function on single-chip microcomputer 280, wherein keyboard 270 is connected with single-chip microcomputer with the interruption form, the human-computer interaction function such as carry out that function selection and Measuring Time, measurement pattern arrange, set content will show on liquid crystal display 290 simultaneously.
Equally, keyboard entry function mainly contains weighted mode (A, C, Z) and selects, and time weighted mode (F, S, I) is selected, and Measuring Time is set, and selects display mode, and save data arranges etc., and liquid crystal display coordinates the requirement of keyboard to show.When having button to press, single-chip microcomputer is judged user's request according to the button of pressing, and sends out interrupt request to DSP simultaneously, DSP responds interruption, measure calculating according to the demand of user key-press setting, and result is sent to single-chip microcomputer, single-chip microcomputer is presented at result on liquid crystal display.When pressing without button, preferred employing default value is that A weighted mode is measured the instantaneous sound pressure level, the equivalent sound pressure level that carried out 10 minutes is measured, and instantaneous sound pressure level, equivalent sound pressure level, statistics sound pressure level, maximum sound pressure level, minimal sound pressure levels are presented on liquid crystal display.
Below provide a kind of concrete application mode that can realize better sound-pressure-level measurement effect of the present invention: microphone can adopt condenser microphone; Prime amplifier can be arranged on the position of the inner close capacitance type sensor of noise measurement system; DSP is floating-point chip or other DSP of 32; External memory storage can be the storer of 512K or other models with addressable space; Single-chip microcomputer can adopt the single-chip microcomputer of C51 series; Can connect level shifting circuit between DSP and single-chip microcomputer, carry out stable communication to guarantee DSP and single-chip microcomputer; Liquid crystal display can adopt the liquid crystal display with graphical display function.If adopt external AD sampling module, preferably adopting 24, upper limit range minimum value is the AD sampling module of 10V.
In conjunction with above noise measurement system, the present invention also provides a kind of noise measuring method, and its overview flow chart is made a concrete analysis of the method below in conjunction with Fig. 4 as shown in Figure 4.
S101, electrification reset and initialization system; The microphone of noise measurement system obtains voice signal, and is translated into the voltage signal of simulation, reduces the voltage signal impedance by prime amplifier, then converts the voltage signal in low impedance that obtains to digital signal by the AD sampling module;
S102, by keyboard, the needed calculating parameter of sound pressure level computational analysis is set, digital signal processor has judged whether interrupt request, and when interrupt request was arranged, response was interrupted, sampled digital signal; According to calculating parameter selection analysis pattern, digital signal is carried out the sound pressure level analytical calculation, obtain sound pressure level, when there is no interrupt request, sampled digital signal directly calculates instantaneous sound pressure level and equivalent sound pressure level.
Wherein the analytical model of noise signal comprised octave analysis and fft analysis.
The octave analysis flow process comprises the following steps as shown in Figure 5: 4096 digital signal datas of sampling; Initialization octave analysis result store district first by the bandpass filter of 20KHz, calculates the quadratic sum of 4096 filtering results with all digital signals, and the line linearity of going forward side by side is average; Extract recombination signal by 1/2 again, the digital band-pass filter that digital signal is cycled through preset frequency carries out filtering, ask quadratic sum and carry out linear averaging, comprise successively the bandpass filter of 16KHz, the bandpass filter of 12.5KHz and the bandpass filter of 10KHz, after end product is passed through the low-pass filter of 10KHz, calculate the population mean after each band-pass filter, and calculate each sound control and overall sound pressure level; Again digital signal is carried out 1/2 and extract to carry out the filtering of next round.Each filtering result of calculation all is stored in octave analysis result store district, uses in order to follow-up operational analysis.Can set cycle index i=10, when i 〉=10, produce when interrupting until timer overflows, stop octave analysis, utilize the data that are kept in octave analysis result store district to calculate equivalent sound pressure level, the statistics sound pressure level.
The fft analysis flow process is illustrated in figure 6 as, and is set as 30 minutes as example in frequency weighted mode as A weighted, Measuring Time, and the fft analysis detailed process is as follows:
Enter the FFT mode of operation, set predetermined analysis time, make timer timing 30 minutes and start working, at first gather 4096 data, carry out the FFT conversion and obtain signal spectrum, energy spectrum, one-sided power spectrum, obtain the spectra of sound pressure of noise signal by one-sided power spectrum, then calculated the sound pressure level of each Frequency point by the formula that calculates sound pressure level.Then call the function that calculates the A weighted, draw the weighted modified value of each Frequency point, carry out summation operation with the corresponding sound pressure level value that calculates before respectively, obtain the sound pressure level value of revised each Frequency point, and drafting sound press level spectrum, then calculate overall sound pressure level by the decibel summation operation, these data are kept in the array that defines, so circulation always, until overflowing, timer produces when interrupting, stop fft analysis, utilize the data that are kept in array to calculate equivalent sound pressure level, the statistics sound pressure level.
Not only calculate the sound pressure level size of noise signal by these two kinds of analytical models, and analyzed the frequency content of signal and the distribution at each frequency place.These all can pass through the realization of software programming algorithm, and adopt modular method for designing, feature richness and convenient expansion.
Relate to simultaneously the integral operation of the correction of frequency weighted and time weighted in the process of calculating sound pressure level.The algorithmic function of frequency weighted by software programming C language calculates the weighted modified value at each frequency place.
The time weighted is a RC series circuit with the integrating circuit equivalence, as shown in Figure 8, release difference equation with this circuit model, realize this difference equation by software programming, realize the different time weighted by changing RC value change integration time constant, implementation procedure as shown in Figure 7.
The present invention is by adopting DSP as APU, given full play to the powerful digital signal processing capability of DSP, not only realize the calculating of sound pressure level, realize simultaneously octave analysis, filtering processing, frequency weighted, time weighted etc., omitted the simulation weighting network, the mimic channels such as analog filtering device, make apparatus structure simple, power-dissipation-reduced, intrinsic noise reduces simultaneously, the more important thing is that measuring accuracy of the present invention is high, dynamic range is large.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (8)
1. the noise measurement system based on digital signal processing, is characterized in that, comprises the microphone, amplifier, AD sampling module, digital signal processor and the single-chip microcomputer that connect successively, wherein,
Described microphone is used for collected sound signal and is translated into the voltage signal of simulation;
Described amplifier for reducing described voltage signal impedance, obtains voltage signal in low impedance;
Described AD sampling module is used for converting described voltage signal in low impedance to digital signal;
Described single-chip microcomputer is used for obtaining sound pressure level and calculates required calculating parameter, and sends look-at-me to described digital signal processor;
Described digital signal processor is used for responding described look-at-me, and sampled digital signal according to described calculating parameter selection analysis pattern, carries out the sound pressure level analytical calculation to described digital signal, obtains sound pressure level; Described analytical model comprises octave analysis and fft analysis, wherein:
Described octave analysis comprises: 4096 digital signal datas of sampling; Initialization octave analysis result store district first by the bandpass filter of 20KHz, calculates the quadratic sum of 4096 filtering results with all digital signals, and the line linearity of going forward side by side is average; Extract recombination signal by 1/2 again, the digital band-pass filter that digital signal is cycled through preset frequency carries out filtering, ask quadratic sum and carry out linear averaging, comprise successively the bandpass filter of 16KHz, the bandpass filter of 12.5KHz and the bandpass filter of 10KHz, after end product is passed through the low-pass filter of 10KHz, calculate the population mean after each band-pass filter, and calculate each sound control and overall sound pressure level; Again digital signal is carried out 1/2 and extract to carry out the filtering of next round; Each filtering result of calculation all is stored in octave analysis result store district, uses in order to follow-up operational analysis; Set cycle index i=10, when i 〉=10, produce when interrupting until timer overflows, stop octave analysis, utilize the data that are kept in octave analysis result store district to calculate equivalent sound pressure level, the statistics sound pressure level;
When described analytical model is fft analysis, comprising: set predetermined analysis time, and sampled digital signal; Described digital signal is carried out the FFT conversion, obtain signal spectrum, energy spectrum, one-sided power spectrum, obtain the spectra of sound pressure of noise signal by one-sided power spectrum, calculate the sound pressure level of each Frequency point according to the formula that calculates sound pressure level; Calculate the sound pressure level value of each Frequency point, and draw sound press level spectrum, calculate overall sound pressure level by the decibel summation operation.
2. noise measurement system as claimed in claim 1, is characterized in that, it is inner that described AD sampling module is arranged at described digital signal processor; Described amplifier comprises prime amplifier and programmable amplifier, wherein,
Described prime amplifier is used for described voltage signal is carried out impedance transformation, and the high impedance voltage signal is become voltage signal in low impedance;
Described programmable amplifier be used for adjusting described voltage signal in low impedance size according to the full scale value of described AD sampling module, and the signal after processing sends to described AD sampling module.
3. noise measurement system as claimed in claim 1, is characterized in that, described AD sampling module is connected between described digital signal processor and described amplifier; Described amplifier is prime amplifier, is used for described voltage signal is carried out impedance transformation, the high impedance voltage signal is become voltage signal in low impedance, and send to described AD sampling module.
4. noise measurement system as claimed in claim 1, is characterized in that, is connected with external memory storage on described digital signal processor, is used for storing described result of calculation.
5. noise measurement system as claimed in claim 1, it is characterized in that, be connected with keyboard on described single-chip microcomputer, be used for inputting described digital signal processor and carry out the needed calculating parameter of sound pressure level computational analysis, comprise time weighted mode, Measuring Time or display mode.
6. noise measurement system as claimed in claim 1, is characterized in that, is connected with level shifting circuit between described single-chip microcomputer and described digital signal processor, and adopt the SCI agreement to communicate.
7. noise measuring method based on digital signal processing comprises the following steps:
A, obtain voice signal, and be translated into digital signal;
B, the needed calculating parameter of sound pressure level computational analysis is set, has judged whether interrupt request;
C, when interrupt request is arranged, the described digital signal of sampling according to calculating parameter selection analysis pattern, is carried out the sound pressure level analytical calculation to described digital signal, obtains sound pressure level; Described analytical model comprises octave analysis and fft analysis; When analytical model is octave analysis, comprise the following steps:
C1, sampled digital signal;
C2, the digital band-pass filter that described digital signal is cycled through preset frequency carry out filtering;
C3, according to the filtering result, calculate the population mean of the bandpass filtering value of all digital signals, and calculate each sound control and overall sound pressure level;
Wherein, described octave analysis specifically comprises: 4096 digital signal datas of sampling; Initialization octave analysis result store district first by the bandpass filter of 20KHz, calculates the quadratic sum of 4096 filtering results with all digital signals, and the line linearity of going forward side by side is average; Extract recombination signal by 1/2 again, the digital band-pass filter that digital signal is cycled through preset frequency carries out filtering, ask quadratic sum and carry out linear averaging, comprise successively the bandpass filter of 16KHz, the bandpass filter of 12.5KHz and the bandpass filter of 10KHz, after end product is passed through the low-pass filter of 10KHz, calculate the population mean after each band-pass filter, and calculate each sound control and overall sound pressure level; Again digital signal is carried out 1/2 and extract to carry out the filtering of next round; Each filtering result of calculation all is stored in octave analysis result store district, uses in order to follow-up operational analysis; Set cycle index i=10, when i 〉=10, produce when interrupting until timer overflows, stop octave analysis, utilize the data that are kept in octave analysis result store district to calculate equivalent sound pressure level, the statistics sound pressure level;
In described step C, when described analytical model is fft analysis, comprise the following steps:
Analysis time is scheduled in C11, setting, and sampled digital signal;
C12, described digital signal is carried out the FFT conversion, obtain signal spectrum, energy spectrum, one-sided power spectrum, obtain the spectra of sound pressure of noise signal by one-sided power spectrum, calculate the sound pressure level of each Frequency point according to the formula that calculates sound pressure level;
C13, calculate the sound pressure level value of each Frequency point, and draw sound press level spectrum, calculate overall sound pressure level by the decibel summation operation.
8. noise measuring method as claimed in claim 7, is characterized in that, when there is no interrupt request, sampled digital signal calculates instantaneous sound pressure level and equivalent sound pressure level.
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| CN105321527B (en) * | 2014-06-26 | 2019-07-19 | 广东美的制冷设备有限公司 | Terminal operating environment reminding method and system |
| CN105424172B (en) * | 2015-12-08 | 2018-12-28 | 国家电网公司 | A kind of distributed power transformer noise detection system and its noise detecting method |
| CN105403307A (en) * | 2015-12-16 | 2016-03-16 | 广东省职业病防治院 | Noise detection comparison apparatus and method |
| US9654106B1 (en) * | 2015-12-21 | 2017-05-16 | Schneider Electric USA, Inc. | Dynamic digital input filtering |
| CN105738806B (en) * | 2016-02-03 | 2019-02-19 | 北京汉能华科技股份有限公司 | A kind of wind power generating set fault diagnosis system and method |
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| CN106053106B (en) * | 2016-05-13 | 2019-04-16 | 北京科技大学 | A kind of acoustic fatigue test device for realizing high sound pressure level using electric loudspeaker |
| CN108459532A (en) * | 2017-02-22 | 2018-08-28 | 长沙乐昌林电子科技有限公司 | A kind of Audio Frequency Analyser |
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| CN111488818B (en) * | 2020-04-08 | 2024-01-23 | 北京集创北方科技股份有限公司 | System noise analysis method and device and computer readable storage medium |
| CN112345855B (en) * | 2020-10-30 | 2021-10-08 | 浙江大学 | System and method for detecting running state of shunt reactor |
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