CN106352974B - A kind of digital sound level meter pulse weighted method and device - Google Patents
A kind of digital sound level meter pulse weighted method and device Download PDFInfo
- Publication number
- CN106352974B CN106352974B CN201610666038.1A CN201610666038A CN106352974B CN 106352974 B CN106352974 B CN 106352974B CN 201610666038 A CN201610666038 A CN 201610666038A CN 106352974 B CN106352974 B CN 106352974B
- Authority
- CN
- China
- Prior art keywords
- signal
- spectrum overlapping
- digital
- level meter
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The embodiment of the invention provides a kind of digital sound level meter pulse weighted method and devices, belong to audio field of measuring technique.The sound level meter pulse weighted method includes: the instantaneous sound pressure signal p (n) of acquisition noise；Spectrum overlapping is carried out to the instantaneous sound pressure signal p (n), obtains spectrum overlapping signal pAC(n), to the spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)；By the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signalTo the digital filtered signalDigitlization peak detection is carried out, detection output result is obtainedResult is exported according to the detectionPulse weighted output result is calculated.The present invention can effectively improve the accuracy measured to noise.
Description
Technical field
The present invention relates to audio field of measuring technique, in particular to a kind of digital sound level meter pulse weighted side
Method and device.
Background technique
Noise is one of primary pollution source of Contemporary Environmental, and the normal work of people, rest and physical and mental health are all made
At seriously affecting.In addition, impulsive noise has the harmfulness bigger than steady-state noise, such as the report of a gun on battlefield, life
In of short duration loud noise acoustic conductance cause that people temporarily becomes deaf or complete deafness situation occurs repeatedly.For different noise signals,
IEC61672 recommends sound level meter using slow (S), fast (F) and three kinds of time weighted modes of pulse (I), with different to pace of change
Noise measures.Wherein, for S weighted to measure steady-state noise (timeconstantτ=1s), F weighted is larger to measure fluctuation
Nonstationary noise and traffic noise (timeconstantτ=125ms), I weighted is for measuring long-term pulse
Noise (timeconstantτ=35ms), such as punching machine, by hammer generation noise.
Currently, the S weighted of sound level meter, F weighted have the implementation model of total digitalization, 1 grade of sound level can be fully met
The requirement of meter.However, pulse weighted but so far without digital model, generallys use traditional analog circuit implementation method to making an uproar
Sound measures, and on the one hand makes the big volume of equipment, debugging inconvenience and measurement error big；On the other hand, S weighted and F weighted
Mathematicization model impairment rate it is too fast, be not able to satisfy the attenuation requirement that pulsimeter weighs lower 2.9dB/s, seriously constrain pulse and make an uproar
The accuracy of sound measurement.
Summary of the invention
The present invention provides a kind of digital sound level meter pulse weighted method and devices, it is intended to realize impulse noise measurement
Digitlization, improve the accuracy of measurement result.
In a first aspect, the sound level meter pulse weighted method that one kind provided in an embodiment of the present invention is digital, comprising: acquisition is made an uproar
The instantaneous sound pressure signal p (n) of sound, wherein n is the n moment；
Spectrum overlapping is carried out to the instantaneous sound pressure signal p (n), obtains spectrum overlapping signal pAC(n), to the frequency meter
Weigh signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)；
By the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signal
To the digital filtered signalDigitlization peak detection is carried out, detection output result is obtainedAnd
Result is exported according to the detectionPulse weighted output result is calculated.
Preferably, described the step of carrying out spectrum overlapping to the instantaneous sound pressure signal p (n), includes:
According to frequency A weighted mode, the spectrum overlapping signal p is calculated using following calculation formulaAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)-
0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)-0.2422p(n-2)+
0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)+0.2422p(n-6)
Preferably, described the step of carrying out spectrum overlapping to the instantaneous sound pressure signal p (n), includes:
According to frequency C weighted mode, the spectrum overlapping signal p is calculated using following calculation formulaAC(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)+
0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)
Preferably, described by the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signalCalculation formula are as follows:
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
Preferably, described to the digital filtered signalDigitlization peak detection is carried out, detection output knot is obtained
FruitThe step of include:
Judge the digital filtered signalWithSize relation；
When describedWhen, the detection exports resultIt is equal to
When describedWhen, the detection exports resultIt is equal to
Wherein,τ2For damping time constant, and τ2=1500ms, Δ t are the sampling period.
Second aspect, the digital sound level meter pulse weighted device of one kind provided in an embodiment of the present invention, comprising:
Sampling module, the instantaneous sound pressure signal p (n) for acquisition noise, wherein n is the n moment；
Square operation module obtains spectrum overlapping signal for carrying out spectrum overlapping to the instantaneous sound pressure signal p (n)
pAC(n), to the spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)；
Digital filtering module is used for the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtering letter
Number
Peak detection module, for the digital filtered signalDigitlization peak detection is carried out, detection is obtained
Export resultAnd
Computing module, for exporting result according to the detectionPulse weighted output result is calculated.
Preferably, the square operation module is also used to according to frequency A weighted mode, calculates institute using following calculation formula
State spectrum overlapping signal pAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)-
0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)-0.2422p(n-2)+
0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)+0.2422p(n-6)
Preferably, the square operation module is also used to according to frequency C weighted mode, calculates institute using following calculation formula
State spectrum overlapping signal pAC(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)+
0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)
Preferably, digital filtered signal is calculated using following formula in the digital filtering module
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
Preferably, the peak detection module is to the digital filtered signalDigitlization peak detection is carried out, is obtained
To detection output result withMode include；
Judge the digital filtered signalWithSize relation；
When describedWhen, the detection exports resultIt is equal to
When describedWhen, the detection exports resultIt is equal to
Wherein,τ2For damping time constant, and τ2=1500ms, Δ t are the sampling period.
The digital sound level meter pulse weighted method and device of one kind provided in an embodiment of the present invention, passes through acquisition noise
Instantaneous sound pressure signal, and according to frequency A weighted mode or frequency C weighted mode, which is subjected to digital filtering sum number
Detection output is obtained after the digitized processings such as word peak detection as a result, can be improved the accuracy of measurement result in turn.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore should not be viewed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of composition block diagram for noise control equipment that embodiment of the present invention provides.
Fig. 2 is a kind of digital sound applied to noise control equipment shown in FIG. 1 that embodiment of the present invention provides
The flow chart of grade meter pulse weighted method.
Fig. 3 is a kind of digital sound applied to noise control equipment shown in FIG. 1 that embodiment of the present invention provides
The functional block diagram of grade meter pulse weighted device.
Figure acceptance of the bid note is respectively as follows:
Noise control equipment 100, sound level meter pulse weighted device 200；
Audio sensor 101, signal processing circuit 102, processor 103, memory 104, storage control 105, peripheral hardware
Interface 106, input-output unit 107, display unit 108；
Sampling module 201, square operation module 202, digital filtering module 203, peak detection module 204, computing module
205。
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile of the invention
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
As shown in Figure 1, being the block diagram of the noise control equipment 100.The noise control equipment 100 includes sound
It is video sensor 101, signal processing circuit 102, processor 103, memory 104, storage control 105, Peripheral Interface 106, defeated
Enter output unit 107 and display unit 108 etc..
The audio sensor 101, signal processing circuit 102, processor 103, memory 104, storage control 105,
Peripheral Interface 106, input-output unit 107 and each element of display unit 108 are directly or indirectly electrically connected between each other, with
Realize the transmission or interaction of data.For example, these elements between each other can be real by one or more communication bus or signal wire
Now it is electrically connected.
Wherein, the memory 104 may be, but not limited to, random access memory (Random Access
Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read only memory (Programmable
Read-Only Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only
Memory, EPROM), electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only
Memory, EEPROM) etc..Wherein, memory 104 is for storing program, the processor 103 after receiving and executing instruction,
Execute described program.
Processor 103 may be a kind of IC chip, the processing capacity with signal.Above-mentioned processor 103 can
To be general processor, including central processing unit (Central Processing Unit, abbreviation CPU), network processing unit
(Network Processor, abbreviation NP) etc.；Can also be digital signal processor (DSP), specific integrated circuit (ASIC),
Field programmable gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hard
Part component.It may be implemented or execute disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor
It can be microprocessor or the processor be also possible to any conventional processor etc..
Various input/output devices are couple processor 103 and memory 104 by the Peripheral Interface 106.Some
In embodiment, Peripheral Interface 106, processor 103 and storage control 105 can be realized in one single chip.Other one
In a little examples, they can be realized by independent chip respectively.
As shown in Fig. 2, being the number applied to noise control equipment 100 shown in FIG. 1 that embodiment of the present invention provides
The flow chart of the sound level meter pulse weighted method of formula.The weighted method includes the following steps.
Step S101: the instantaneous sound pressure signal p (n) of acquisition noise.In the present embodiment, step S101 can be by the sampling
Module 201 executes.
In the present embodiment, by the way that audio sensor 101 to be placed in noise circumstance, for sensing the instantaneous sound of the noise
It presses signal p (n), wherein n is the n moment.Wherein, collected instantaneous sound pressure signal is sent to institute by the audio sensor 101
Signal processing circuit 102 is stated, to carry out Signal Pretreatment and analog-to-digital conversion to the instantaneous sound pressure signal.The signal processing electricity
Road 102 then exports digital sound pressure signal corresponding with the instantaneous sound pressure signal p (n), and the digital sound pressure signal is sent out
Give the processor 103.
Step S102: spectrum overlapping is carried out to the instantaneous sound pressure signal p (n), obtains spectrum overlapping signal pAC(n), right
The spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n).It is described in the present embodiment
Step S102 can be executed by the square operation module 202.
In the present embodiment, sound level meter is known as sound level by the sound pressure level that spectrum overlapping measures, and the spectrum overlapping can wrap
Include frequency A weighted and frequency C weighted.Wherein, frequency A weighted is the response for simulating human ear to 40 side's pure tones in equal loudness contour, it
Curve shape and 340 sides equal loudness contour on the contrary, to make in electric signal, low-frequency range has biggish decaying.Frequency C weighted
It is the response for simulating human ear to 100 side's pure tones, there is almost straight response in entire audio range.The processor 103 is right
The digital sound pressure signal received carries out frequency A weighted or frequency C weighted, obtains spectrum overlapping signal pAC(n).And to obtaining
Spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)。
Specifically, when the spectrum overlapping is frequency A weighted mode, the frequency can be calculated by following calculation formula
Rate weighted signal pAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)-
0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)-0.2422p(n-2)+
0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)+0.2422p(n-6)
When the spectrum overlapping is frequency C weighted mode, the spectrum overlapping can be calculated by following calculation formula
Signal pAC(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)+
0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)
Step S103: by the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signalIn the present embodiment, the step S103 can be executed by the digital filtering module 203.
Wherein, the calculated spectrum overlapping quadrature signal p2 ACIt (n) is a wide band digital signal, in order to obtain
Spectrum overlapping quadrature signal p within the scope of pre-set frequency band2 AC(n), it needs to the spectrum overlapping quadrature signal p2 AC(n) it is filtered
Wave obtains digital filtered signalIn the present embodiment, the digital filtered signalFor low-frequency digital signal.
Specifically, the digital filtering module 203 is also used to that digital filtered signal is calculated using following formula
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
Step S104: to the digital filtered signalDigitlization peak detection is carried out, detection output result is obtainedIn the present embodiment, the step S104 can be executed by the peak detection module 204.
Wherein, by the digital filtered signalDigitlization peak detection is carried out, detection output result is obtainedSpecifically, the digital filtered signal is first determined whetherWithSize relation；Then according to institute
State digital filtered signalWithSize relation calculate detection export result.When describedWhen, the detection exports resultIt is equal toWhen describedWhen, institute
State detection output resultIt is equal toWherein,τ2For damping time constant, and τ2=1500ms, Δ
T is the sampling period.
Step S105: result is exported according to the detectionPulse weighted output result is calculated.The present embodiment
In, the step S105 can be executed by the computing module 205.
Specifically, the calculating, which can be, exports result to the detectionLogarithm is sought after being extracted square root, and obtains arteries and veins
Rush weighted output result.
As shown in figure 3, being a kind of number applied to noise control equipment 100 shown in FIG. 1 provided in an embodiment of the present invention
The functional block diagram of the sound level meter pulse weighted device 200 of word formula.The sound level meter pulse weighted device 200 includes at least one
A software function module that can be stored in the form of software or firmware (firmware) in the memory 104.The processing
Device 103 is used to execute the executable module stored in memory 104, such as the sound level meter pulse weighted device 200 includes
Software function module or computer program.The sound level meter pulse weighted device 200 includes sampling module 201, square operation mould
Block 202, digital filtering module 203, peak detection module 204 and computing module 205.
In the present embodiment, the sampling module 201 is used for the instantaneous sound pressure signal p (n) of acquisition noise, wherein when n is n
It carves.The sampling module 201 may include audio sensor 101 and signal processing circuit 102.About the sampling module 201
Description specifically can refer to the description to step S101 in Fig. 2.That is, the step S101 can by the sampling module 201
It executes.
The square operation module 202 is used to carry out spectrum overlapping to the instantaneous sound pressure signal p (n), obtains frequency meter
Weigh signal pAC(n), to the spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)。
Wherein, the spectrum overlapping may be, but not limited to, frequency A weighted and frequency C weighted.When the spectrum overlapping is frequency A meter
Temporary, the spectrum overlapping signal p is calculated using following calculation formulaAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)-
0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)-0.2422p(n-2)+
0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)+0.2422p(n-6)
When the spectrum overlapping is frequency C weighted, the spectrum overlapping signal p is calculated using following calculation formulaAC
(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)+
0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)
Description specifically can refer to the description to step S102 in Fig. 2 as described in the square operation module 202.That is, institute
Stating step S102 can be executed by the square operation module 202.
The digital filtering module 203 is used for the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains number
Filtering signalIn the present embodiment, the digital filtering module 203 is also used to that number is calculated using following formula
Filtering signal
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
Description specifically can refer to the description to step S103 in Fig. 2 as described in the digital filtering module 203.That is, the step
S103 can be executed by the digital filtering module 203.
The peak detection module 204 is used for the digital filtered signalDigitlization peak detection is carried out, is obtained
Result is exported to detectionIn the present embodiment, the peak detection module 204 is for judging the digital filtered signalWithSize relation.
When describedWhen, the detection exports resultIt is equal to
When describedWhen, the detection exports resultIt is equal to
Wherein,τ2For damping time constant, and τ2=1500ms, Δ t are the sampling period.
Description specifically can refer to the description to step S104 in Fig. 2 as described in the peak detection module 204.That is, institute
Stating step S104 can be executed by the peak detection module 204.
The computing module 205 is used to export result according to the detectionPulse weighted output result is calculated.
Description specifically can refer to the description to step S105 in Fig. 2 as described in the computing module 205.That is, the step S105 can
To be executed by the computing module 205.
The digital sound level meter pulse weighted method and device of one kind provided in an embodiment of the present invention, passes through acquisition noise
Instantaneous sound pressure signal, and according to frequency A weighted mode or frequency C weighted mode, which is subjected to digital filtering sum number
Detection output is obtained after the digitized processings such as word peak detection as a result, can be improved the accuracy of measurement result in turn.
It should be noted that in embodiment provided herein, it should be understood that disclosed device and method, it can
To realize by another way.The apparatus embodiments described above are merely exemplary, for example, the unit is drawn
Point, only a kind of logical function partition, there may be another division manner in actual implementation.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.The apparatus embodiments described above are merely exemplary, for example, the flow chart and block diagram in the drawings show
The device of multiple embodiments according to the present invention, the architectural framework in the cards of method and computer program product, function and
Operation.In this regard, each box in flowchart or block diagram can represent a part of a module, section or code,
A part of the module, section or code includes one or more executable fingers for implementing the specified logical function
It enables.It should also be noted that in some implementations as replacements, function marked in the box can also be to be different from institute in attached drawing
The sequence of mark occurs.For example, two continuous boxes can actually be basically executed in parallel, they sometimes can also be by phase
Anti- sequence executes, and this depends on the function involved.It is also noted that each box in block diagram and or flow chart, with
And the combination of the box in block diagram and or flow chart, can function or movement as defined in executing it is dedicated hardware based
System is realized, or can be realized using a combination of dedicated hardware and computer instructions.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. a kind of digital sound level meter pulse weighted method, which is characterized in that the sound level meter pulse weighted method includes:
The instantaneous sound pressure signal p (n) of acquisition noise, wherein n is the n moment；
Spectrum overlapping is carried out to the instantaneous sound pressure signal p (n), obtains spectrum overlapping signal pAC(n), the spectrum overlapping is believed
Number pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)；
By the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signal
To the digital filtered signalDigitlization peak detection is carried out, detection output result is obtainedAnd
Result is exported according to the detectionPulse weighted output result is calculated；
It is described to the instantaneous sound pressure signal p (n) carry out spectrum overlapping the step of include:
According to frequency A weighted mode, the spectrum overlapping signal p is calculated using following calculation formulaAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)
-0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)
-0.2422p(n-2)+0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)
+0.2422p(n-6)。
2. digital sound level meter pulse weighted method according to claim 1, which is characterized in that described to described instantaneous
Sound pressure signal p (n) carry out spectrum overlapping the step of include:
According to frequency C weighted mode, the spectrum overlapping signal p is calculated using following calculation formulaAC(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)+
0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)。
3. digital sound level meter pulse weighted method according to claim 1 or 2, which is characterized in that it is described will be described
Spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signalCalculation formula are as follows:
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
4. digital sound level meter pulse weighted method according to claim 3, which is characterized in that described to the number
Filtering signalDigitlization peak detection is carried out, detection output result is obtainedThe step of include:
Judge the digital filtered signalWithSize relation；
When describedWhen, the detection exports resultIt is equal to
When describedWhen, the detection exports resultIt is equal to
Wherein,τ2For damping time constant, and τ2=1500ms, Δ t are the sampling period.
5. a kind of digital sound level meter pulse weighted device, which is characterized in that the sound level meter pulse weighted device includes:
Sampling module, the instantaneous sound pressure signal p (n) for acquisition noise, wherein n is the n moment；
Square operation module obtains spectrum overlapping signal p for carrying out spectrum overlapping to the instantaneous sound pressure signal p (n)AC
(n), to the spectrum overlapping signal pAC(n) square operation is carried out, spectrum overlapping quadrature signal p is obtained2 AC(n)；
Digital filtering module is used for the spectrum overlapping quadrature signal p2 AC(n) it is filtered, obtains digital filtered signal
Peak detection module, for the digital filtered signalDigitlization peak detection is carried out, detection output is obtained
As a resultAnd
Computing module, for exporting result according to the detectionPulse weighted output result is calculated；
The square operation module is also used to according to frequency A weighted mode, calculates the spectrum overlapping using following calculation formula
Signal pAC(n):
pAC(n)=1.96922pAC(n-1)-5.5685pAC(n-2)+3.57262pAC(n-3)-0.7980pAC(n-4)
-0.02202pAC(n-5)-0.00143pAC(n-6)+0.24220p(n)-0.48441p(n-1)
-0.2422p(n-2)+0.96882p(n-3)-0.2422p(n-4)-0.48441p(n-5)
+0.2422p(n-6)。
6. digital sound level meter pulse weighted device according to claim 5, which is characterized in that
The square operation module is also used to according to frequency C weighted mode, calculates the spectrum overlapping using following calculation formula
Signal pAC(n):
pAC(n)=1.96922pAC(n-1)-0.94413pAC(n-2)-0.02494pAC(n-3)-0.00016pAC(n-3)
+0.2557p(n)-0.5114p(n-2)+0.2557p(n-4)。
7. digital sound level meter pulse weighted device according to claim 5 or 6, which is characterized in that
Digital filtered signal is calculated using following formula in the digital filtering module
Wherein, Δ t is sampling period, τ1For time constant, and τ1=35ms,Original state
8. digital sound level meter pulse weighted device according to claim 7, which is characterized in that
The peak detection module is to the digital filtered signalDigitlization peak detection is carried out, detection output knot is obtained
Fruit withMode include；
Judge the digital filtered signalWithSize relation；
When describedWhen, the detection exports resultIt is equal to
When describedWhen, the detection exports resultIt is equal to
Wherein,τ2For damping time constant, and τ2=1500ms, Δ t are the sampling period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610666038.1A CN106352974B (en) | 2016-08-12 | 2016-08-12 | A kind of digital sound level meter pulse weighted method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610666038.1A CN106352974B (en) | 2016-08-12 | 2016-08-12 | A kind of digital sound level meter pulse weighted method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106352974A CN106352974A (en) | 2017-01-25 |
| CN106352974B true CN106352974B (en) | 2019-03-12 |
Family
ID=57844021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610666038.1A Active CN106352974B (en) | 2016-08-12 | 2016-08-12 | A kind of digital sound level meter pulse weighted method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106352974B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031083A (en) * | 2018-12-31 | 2019-07-19 | 瑞声科技(新加坡)有限公司 | A kind of noise overall sound pressure level measurement method, system and computer readable storage medium |
| CN113421539B (en) * | 2021-07-19 | 2023-10-10 | 北京安声浩朗科技有限公司 | Active noise reduction method and device, electronic equipment and computer readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2916599Y (en) * | 2006-04-28 | 2007-06-27 | 杭州爱华仪器有限公司 | Digital true effective value rectifying module |
| CN101539602A (en) * | 2009-04-23 | 2009-09-23 | 浙江理工大学 | Full-digital real-time noise measurement and analysis method and system thereof |
| CN102506994A (en) * | 2011-11-21 | 2012-06-20 | 嘉兴中科声学科技有限公司 | Digitized acoustic detection system |
| JP5251291B2 (en) * | 2008-06-23 | 2013-07-31 | 日本電気株式会社 | Weak signal analysis apparatus, weak signal analysis method, and weak signal analysis program |
-
2016
- 2016-08-12 CN CN201610666038.1A patent/CN106352974B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2916599Y (en) * | 2006-04-28 | 2007-06-27 | 杭州爱华仪器有限公司 | Digital true effective value rectifying module |
| JP5251291B2 (en) * | 2008-06-23 | 2013-07-31 | 日本電気株式会社 | Weak signal analysis apparatus, weak signal analysis method, and weak signal analysis program |
| CN101539602A (en) * | 2009-04-23 | 2009-09-23 | 浙江理工大学 | Full-digital real-time noise measurement and analysis method and system thereof |
| CN102506994A (en) * | 2011-11-21 | 2012-06-20 | 嘉兴中科声学科技有限公司 | Digitized acoustic detection system |
Non-Patent Citations (1)
| Title |
|---|
| 脉冲（精密）声级计;郭之璜;《机械工程中的噪声测试与控制》;机械工业出版社;19930430;第33页最后一行至第34页倒数第九行，图2-13、2-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106352974A (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105022860B (en) | PCB solder joint random vibration Prediction method for fatigue life and system | |
| US10932073B2 (en) | Method and system for measuring total sound pressure level of noise, and computer readable storage medium | |
| CN106897717A (en) | Bayesian model modification method under multiple test based on environmental excitation data | |
| CN106523928B (en) | Pipeline leakage detection method based on the screening of sound wave real time data two level | |
| US10228994B2 (en) | Information processing system, information processing method, and program | |
| EP3316255A1 (en) | Method, device, and equipment for voice quality assessment | |
| CN105989853A (en) | Audio quality evaluation method and system | |
| CN102506994A (en) | Digitized acoustic detection system | |
| CN101701834B (en) | Strong interference resistant digital vortex shedding flowmeter based on double sensors | |
| CN107993648A (en) | A kind of unmanned plane recognition methods, device and electronic equipment | |
| CN108042141A (en) | A kind of signal processing method and device | |
| CN101706299A (en) | Coriolis mass flow transmitter based on DSP | |
| CN106685752B (en) | A kind of information processing method and terminal | |
| CN106352974B (en) | A kind of digital sound level meter pulse weighted method and device | |
| CN113033722B (en) | Sensor data fusion method and device, storage medium and computing equipment | |
| CN107704192A (en) | A kind of filtering algorithm and its detector | |
| CN104729677B (en) | A kind of time-domain digital weighted method of nonstationary noise signal | |
| JP2013176535A5 (en) | ||
| CN109241838A (en) | Speed changer quality evaluating method based on psychologic acoustics objective parameter | |
| CN103983345B (en) | A kind of single-frequency based on human hearing characteristic has voicing signal automatic monitoring method | |
| CN109116183B (en) | Harmonic model parameter identification method and device, storage medium and electronic equipment | |
| CN107462191B (en) | A kind of multichannel vibrating wire sensor frequency measuring method, device and equipment | |
| CN103413558B (en) | A kind of audio frequency apparatus method of testing | |
| CN104569675A (en) | Flickering detecting circuit and detecting method in electric energy measuring chip | |
| CN116592994A (en) | Transformer operation monitoring method and device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |