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
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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 invention relates to the technical field of audio measurement, in particular to a digital sound level meter pulse weighting method and device.
Background
Noise is one of the main pollution sources of modern environment, and has serious influence on normal work, rest and physical and psychological health of people. In addition, impulse noise is more harmful than stationary noise, such as the sound of a gunshot on a battlefield, a brief loud sound in life causing a person to be temporarily deaf or completely deaf. For different noise signals, IEC61672 recommends that the sound level meter adopts three time weighting modes of slow (S), fast (F) and pulse (I) to measure the noise with different change speeds. The S weight is used to measure steady-state noise (time constant τ is 1S), the F weight is used to measure unsteady-state noise with large fluctuation and traffic noise (time constant τ is 125ms), and the I weight is used to measure impulse noise with long duration (time constant τ is 35ms), such as noise generated by a punch press, a hammer press, and the like.
At present, a fully digital implementation model for S weighting and F weighting of a sound level meter is available, and the requirements of a level-1 sound level meter can be completely met. However, pulse weighting has no digital model so far, and the traditional analog circuit implementation method is usually adopted to measure noise, so that on one hand, the equipment has large volume, inconvenient debugging and large measurement error; on the other hand, the attenuation rate of the mathematical model of the S weighting and the F weighting is too high, so that the attenuation requirement of 2.9dB/S under the pulse weighting can not be met, and the accuracy of the pulse noise measurement is seriously restricted.
Disclosure of Invention
The invention provides a digital sound level meter pulse weighting method and a digital sound level meter pulse weighting device, aiming at realizing the digitization of pulse noise measurement and improving the accuracy of the measurement result.
In a first aspect, an embodiment of the present invention provides a digital sound level meter pulse weighting method, including: acquiring an instantaneous sound pressure signal p (n) of noise, wherein n is n time;
carrying out frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n)；
Weighting said frequency squared signal p2 AC(n) filtering to obtain a digital filtered signal
To the digital filtering signalPerforming digital peak detection to obtain detection output resultAnd
outputting a result according to the detectionAnd calculating to obtain a pulse weighting output result.
Preferably, the step of frequency weighting the instantaneous sound pressure signal p (n) comprises:
calculating the frequency weighting signal p according to the frequency A weighting mode by adopting the 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, the step of frequency weighting the instantaneous sound pressure signal p (n) comprises:
calculating the frequency weighting signal p by the following calculation formula according to the frequency C weighting modeAC(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, said weighting of said frequency squared signal p2 AC(n) filtering to obtain a digital filtered signalThe calculation formula of (2) is as follows:
where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state of
Preferably, said pair of said digitally filtered signalsPerforming digital peak detection to obtain detection output resultComprises the following steps:
judging the digital filtering signalAndthe magnitude relationship of (1);
when saidWhen, atThe detection output resultIs equal to
When saidWhile, the detection outputs the resultIs equal to
Wherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
In a second aspect, an embodiment of the present invention provides a digital pulse weighting device for a sound level meter, including:
the sampling module is used for acquiring an instantaneous sound pressure signal p (n) of noise, wherein n is n time;
a square operation module for performing frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n)；
A digital filtering module for weighting the frequency squared signal p2 AC(n) filtering to obtain a digital filtered signal
A peak detection module for detecting the digital filtering signalPerforming digital peak detection to obtain detection output resultAnd
an operation module for outputting a result according to the detectionAnd calculating to obtain a pulse weighting output result.
Preferably, the square operation module is further configured to calculate the frequency weighting signal p according to a frequency a weighting manner by using the 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, the square operation module is further configured to calculate the frequency weighting signal p by using the following calculation formula according to the frequency C weighting modeAC(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, the digital filtering module calculates the digital filtering signal by using the following formula
Where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state of
Preferably, the peak detection module is used for filtering the digital filtering signalPerforming digital peak detection to obtain detection output result andthe method (1) comprises the following steps;
judging the digital filtering signalAndthe magnitude relationship of (1);
when saidWhile, the detection outputs the resultIs equal to
When saidWhile, the detection outputs the resultIs equal to
Wherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
According to the digital sound level meter pulse weighting method and device provided by the embodiment of the invention, the detection output result is obtained by acquiring the instantaneous sound pressure signal of noise and carrying out digital processing such as digital filtering, digital peak detection and the like on the sound pressure signal according to the frequency A weighting mode or the frequency C weighting mode, so that the accuracy of the measurement result can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a noise processing apparatus according to an embodiment of the present invention.
Fig. 2 is a flow chart of a digital pulse weighting method for the noise processing device shown in fig. 1 according to the embodiment of the present invention.
Fig. 3 is a functional block diagram of a digital pulse weighting device of the sound level meter, which is applied to the noise processing device shown in fig. 1 according to the embodiment of the present invention.
The labels in the figure are respectively:
a noise processing device 100, a sound level meter pulse weighting device 200;
an audio sensor 101, a signal processing circuit 102, a processor 103, a memory 104, a memory controller 105, a peripheral interface 106, an input/output unit 107, and a display unit 108;
the device comprises a sampling module 201, a square operation module 202, a digital filtering module 203, a peak detection module 204 and an operation module 205.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, is a block schematic diagram of the noise processing apparatus 100. The noise processing apparatus 100 includes an audio sensor 101, a signal processing circuit 102, a processor 103, a memory 104, a memory controller 105, a peripheral interface 106, an input-output unit 107, a display unit 108, and the like.
The audio sensor 101, the signal processing circuit 102, the processor 103, the memory 104, the storage controller 105, the peripheral interface 106, the input/output unit 107 and the display unit 108 are electrically connected to each other directly or indirectly, so as to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines.
The Memory 104 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 104 is configured to store a program, and the processor 103 executes the program after receiving the execution instruction.
The processor 103 may be an integrated circuit chip having signal processing capabilities. The Processor 103 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripherals interface 106 couples various input/output devices to the processor 103 and to the memory 104. In some embodiments, peripheral interface 106, processor 103, and memory controller 105 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
As shown in fig. 2, it is a flowchart of a digital pulse weighting method for a sound level meter applied to the noise processing device 100 shown in fig. 1 according to the embodiment of the present invention. The weighting method comprises the following steps.
Step S101: the instantaneous sound pressure signal p (n) of the noise is acquired. In this embodiment, the step S101 may be executed by the sampling module 201.
In this embodiment, the audio sensor 101 is placed in a noisy environment to sense an instantaneous sound pressure signal p (n) of the noise, where n is n time. The audio sensor 101 sends the acquired instantaneous sound pressure signal to the signal processing circuit 102, so as to perform signal preprocessing and analog-to-digital conversion on the instantaneous sound pressure signal. The signal processing circuit 102 outputs a digital sound pressure signal corresponding to the instantaneous sound pressure signal p (n), and sends the digital sound pressure signal to the processor 103.
Step S102: carrying out frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n) of (a). In this embodiment, the step S102 can be executed by the square operation module 202.
In this embodiment, the sound pressure level measured by the sound level meter through the frequency weighting is called sound level, and the frequency weighting may include a frequency a weighting and a frequency C weighting. The weighting of the frequency A is to simulate the response of human ears to pure sound of 40 square in an equal loudness curve, and the curve shape of the weighting is opposite to that of the equal loudness curve of 340 square, so that the middle and low frequency bands of the electric signal have larger attenuation. The frequency C weight is to simulate the response of human ear to a pure 100 square tone, with a nearly flat response over the entire audio frequency range. The processor 103 performs frequency a weighting or frequency C weighting on the received digital sound pressure signal to obtain a frequency weighting signal pAC(n) of (a). And weighting the obtained frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n)。
Specifically, when the frequency weighting is the frequency a weighting method, the following calculation formula may be usedCalculating said frequency weighting 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 frequency weighting is a frequency C weighting method, the frequency weighting signal p may be calculated by the 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)
Step S103: weighting said frequency squared signal p2 AC(n) filtering to obtain a digital filtered signalIn this embodiment, the step S103 can be executed by the digital filtering module 203.
Wherein the calculated frequency weighted square signal p2 AC(n) is a wide-band digital signal, in order to obtain a frequency weighted square signal p within a predetermined frequency band2 AC(n) the frequency is required to weight the squared signal p2 AC(n) filtering to obtain a digital filtered signalIn this embodiment, the digital filtering signalIs a low frequency digital signal.
Specifically, the digital filtering module 203 is further configured to calculate a digital filtering signal by using the following formula
Where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state of
Step S104: to the digital filtering signalPerforming digital peak detection to obtain detection output resultIn this embodiment, the step S104 can be executed by the peak detection module 204.
Wherein the digital filtered signal isPerforming digital peak detection to obtain detection output resultSpecifically, the digitally filtered signal is first determinedAndthe magnitude relationship of (1); then according to the digital filtering signalAndthe magnitude relation of (2) calculates the detection output result. When saidWhile, the detection outputs the resultIs equal toWhen saidWhile, the detection outputs the resultIs equal toWherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
Step S105: outputting a result according to the detectionAnd calculating to obtain a pulse weighting output result. In this embodiment, the step S105 can be executed by the operation module 205.
In particular, the calculation may be of the detection output resultAnd carrying out square opening and logarithm solving to obtain a pulse weighting output result.
Fig. 3 is a block diagram of functional blocks of a digital pulse weighting device 200 of a sound level meter, which is applied to the noise processing apparatus 100 shown in fig. 1 according to an embodiment of the present invention. The sound level meter pulse weighting device 200 comprises at least one software function which may be stored in the memory 104 in the form of software or firmware. The processor 103 is configured to execute executable modules stored in the memory 104, such as software functional modules or computer programs included in the sound level meter pulse weighting device 200. The pulse weighting device 200 of the sound level meter comprises a sampling module 201, a square operation module 202, a digital filtering module 203, a peak detection module 204 and an operation module 205.
In this embodiment, the sampling module 201 is configured to collect an instantaneous sound pressure signal p (n) of noise, where n is n time. The sampling module 201 may include an audio sensor 101 and a signal processing circuit 102. The description of the sampling module 201 may refer to the description of step S101 in fig. 2. That is, the step S101 may be performed by the sampling module 201.
The square operation module 202 is configured to perform frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n) of (a). The frequency weighting may be, but is not limited to, frequency a weighting and frequency C weighting. When the frequency weighting is frequency A weighting, the frequency weighting signal p is calculated by the 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 frequency weighting is the frequency C weighting, the frequency weighting signal p is calculated by the 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)
The description of the square operation module 202 may refer to the description of step S102 in fig. 2. That is, the step S102 may be performed by the square operation module 202.
The digital filtering module 203 is used for weighting the frequency to square the signal p2 AC(n) filtering to obtain a digital filtered signalIn this embodiment, the digital filtering module 203 is further configured to calculate to obtain a digital filtering signal by using the following formula
Where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state ofThe description of the digital filtering module 203 may specifically refer to the description of step S103 in fig. 2. That is, the step S103 may be performed by the digital filtering module 203.
The peak detection module 204 is used for filtering the digital filtering signalPerforming digital peak detection to obtain detection output resultIn this embodiment, the peak detection module 204 is used for determining the digital filtering signalAndthe magnitude relationship of (1).
When saidWhile, the detection outputs the resultIs equal to
When saidWhile, the detection outputs the resultIs equal to
Wherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
The description of the peak detection module 204 can refer to the description of step S104 in fig. 2. That is, the step S104 may be performed by the peak detection module 204.
The operation module 205 is configured to output a result according to the detectionAnd calculating to obtain a pulse weighting output result. The description of the operation module 205 can refer to the description of step S105 in fig. 2. That is, the step S105 may be executed by the operation module 205.
According to the digital sound level meter pulse weighting method and device provided by the embodiment of the invention, the detection output result is obtained by acquiring the instantaneous sound pressure signal of noise and carrying out digital processing such as digital filtering, digital peak detection and the like on the sound pressure signal according to the frequency A weighting mode or the frequency C weighting mode, so that the accuracy of the measurement result can be improved.
It should be noted that, in the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the unit is only a logical division, and other divisions may be realized in practice.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the 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 digital sound level meter pulse weighting method is characterized by comprising the following steps:
acquiring an instantaneous sound pressure signal p (n) of noise, wherein n is n time;
carrying out frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n)；
Weighting said frequency squared signal p2 AC(n) filtering to obtain a digital filtered signal
To the digital filtering signalPerforming digital peak detection to obtain detection output resultAnd
outputting a result according to the detectionCalculating to obtain a pulse weighting output result;
the step of frequency weighting the instantaneous sound pressure signal p (n) comprises:
calculating the frequency weighting signal p according to the frequency A weighting mode by adopting the 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. The digital sound level meter pulse weighting method according to claim 1, wherein said step of frequency weighting the instantaneous sound pressure signal p (n) comprises:
calculating the frequency weighting signal p by the following calculation formula according to the frequency C weighting modeAC(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 weighting method according to claim 1 or 2, characterized in that said weighting of said frequency squared signal p2 AC(n) filtering to obtain a digital filtered signalThe calculation formula of (2) is as follows:
where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state of
4. Digital sound level meter pulse weighting method according to claim 3, characterized in that said pair of said digitally filtered signalsPerforming digital peak detection to obtain detection output resultComprises the following steps:
judging the digital filtering signalAndthe magnitude relationship of (1);
when saidWhile, the detection outputs the resultIs equal to
When saidWhile, the detection outputs the resultIs equal to
Wherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
5. A digital sound level meter pulse weighting device, said sound level meter pulse weighting device comprising:
the sampling module is used for acquiring an instantaneous sound pressure signal p (n) of noise, wherein n is n time;
a square operation module for performing frequency weighting on the instantaneous sound pressure signal p (n) to obtain a frequency weighting signal pAC(n) weighting the frequency signal pAC(n) performing a squaring operation to obtain a frequency weighted square signal p2 AC(n)；
A digital filtering module for squaring the frequency weightSignal p2 AC(n) filtering to obtain a digital filtered signal
A peak detection module for detecting the digital filtering signalPerforming digital peak detection to obtain detection output resultAnd
an operation module for outputting a result according to the detectionCalculating to obtain a pulse weighting output result;
the square operation module is also used for calculating the frequency weighting signal p by adopting the following calculation formula according to the frequency A weighting modeAC(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 weighting device according to claim 5,
the square operation module is also used for calculating the frequency weighting signal p by adopting the following calculation formula according to the frequency C weighting modeAC(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 weighting device according to claim 5 or 6,
the digital filtering module adopts the following formula to calculate and obtain a digital filtering signal
Where Δ t is the sampling period, τ1Is a time constant, and1＝35ms，initial state of
8. Digital sound level meter pulse weighting device according to claim 7,
the peak detection module is used for filtering the digital filtering signalPerforming digital peak detection to obtain detection output result andthe method (1) comprises the following steps;
judging the digital filtering signalAndthe magnitude relationship of (1);
when saidWhile, the detection outputs the resultIs equal to
When saidWhile, the detection outputs the resultIs equal to
Wherein,τ2is a decay time constant, and21500ms, Δ t is the sampling period.
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