WO2020140593A1 - 一种噪音总声压级测量方法、系统及计算机可读存储介质 - Google Patents

一种噪音总声压级测量方法、系统及计算机可读存储介质 Download PDF

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WO2020140593A1
WO2020140593A1 PCT/CN2019/113868 CN2019113868W WO2020140593A1 WO 2020140593 A1 WO2020140593 A1 WO 2020140593A1 CN 2019113868 W CN2019113868 W CN 2019113868W WO 2020140593 A1 WO2020140593 A1 WO 2020140593A1
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sound pressure
signal
noise
pressure level
time
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秦英明
向征
谢兵
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AAC Technologies Holdings Shenzhen Co Ltd
AAC Technologies Pte Ltd
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AAC Acoustic Technologies Shenzhen Co Ltd
AAC Technologies Pte Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2825—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere in household appliances or professional audio/video equipment
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/008—Visual indication of individual signal levels

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  • Embodiments of the present application relate to the field of acoustics, and in particular, to a method, system, and computer-readable storage medium for measuring the total sound pressure level of noise.
  • the silent notification of incoming calls of mobile communication terminal devices such as mobile phones needs to be reminded by the vibration of the body, and the parts that generate vibration are the built-in micro linear vibration motor, and small medical devices such as vibration massagers.
  • the core device of health care equipment is also built-in a miniature linear vibration motor.
  • the motor will generate noise during operation, and the noise can also reflect the operation of the motor to a certain extent.
  • the total sound pressure level is usually measured by the octave accumulation method in the prior art.
  • the inventor of the present application found that the octave accumulation method needs to filter the noise signal before each accumulation, resulting in a large amount of calculation and a slow measurement speed.
  • the purpose of the embodiments of the present application is to provide a method, system and computer-readable storage medium for measuring the total sound pressure level of noise, which has a faster measurement speed.
  • a method for measuring total sound pressure level of noise includes: acquiring a time-domain digital signal of a sound pressure signal of noise; acquiring a frequency-domain signal of the sound pressure signal according to the time-domain digital signal of the sound pressure signal; The frequency domain signal obtains the effective sound pressure value of the sound pressure signal according to Pasval's law; and converts the effective sound pressure value into the total sound pressure level of the noise.
  • An embodiment of the present application also provides a method for measuring the total sound pressure level of noise, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores An instruction executed by at least one processor, the instruction being executed by the at least one processor to enable the at least one processor to perform the aforementioned method for measuring the total sound pressure level of noise.
  • Embodiments of the present application also provide a computer-readable storage medium that stores a computer program, which when executed by a processor implements the aforementioned method for measuring the total sound pressure level of noise.
  • the embodiment of the present application obtains the time domain digital signal of the noise sound pressure signal, obtains the frequency domain signal according to the time domain digital signal, and directly obtains the sound pressure signal according to the frequency domain signal. Value, and then convert the effective sound pressure value into the total sound pressure level of the noise.
  • the effective value of the sound pressure signal can be obtained, which is the effective value of sound pressure.
  • the total sound pressure level of the noise can be obtained. According to the relationship between the time-domain signal and the frequency-domain signal in Pasval's law, the effective value of the sound pressure is obtained without filtering processing, the calculation is simple, and the measurement speed is fast.
  • the time-domain digital signal of the sound pressure signal for acquiring noise specifically includes: collecting the noise through a microphone and outputting a voltage signal; processing the voltage signal through a signal acquisition device to obtain the time domain of the voltage signal Digital signal; based on the time-domain digital signal of the voltage signal and the sensitivity parameter of the microphone, a time-domain digital signal of the noise sound pressure signal is calculated.
  • the acquiring the frequency-domain signal of the sound pressure signal according to the time-domain digital signal of the sound pressure signal specifically includes: performing fast discrete transformation of the time-domain digital signal of the sound pressure signal with a conversion interval length of N Fourier transform to calculate the frequency domain signal of the sound pressure signal.
  • the fast discrete Fourier transform is used to convert the time-frequency domain of the sound pressure signal, and the calculation is relatively simple, which further improves the calculation speed.
  • the acquiring the effective value of the sound pressure of the sound pressure signal according to the frequency domain signal and according to Pasval's law is specifically: obtaining the sum of squares of the frequency domain signal in the transformation interval; The sum of squares and the length N of the transform interval calculate the energy sum of the time-domain digital signal of the sound pressure signal; the energy sum is the effective sound pressure value of the sound pressure signal.
  • the calculating the energy sum of the time-domain digital signal of the sound pressure signal according to the sum of squares and the length N of the transformation interval specifically includes: calculating the sum of squares of the energy by the following formula:
  • E is the energy sum of the time-domain digital signal of the sound pressure signal
  • X[n] is the frequency-domain signal
  • N is the length of the transform interval
  • the conversion of the effective value of the sound pressure into the total sound pressure level of the noise is specifically: calculating the noise according to the effective value of the sound pressure and the conversion formula between the sound pressure and the sound pressure level The total sound pressure level of, where the conversion formula between the sound pressure and the sound pressure level is:
  • Lp is the sound pressure level
  • P is the sound pressure
  • P 0 is the reference sound pressure of 20 ⁇ Pa.
  • FIG. 1 is a program flowchart of a method for measuring the total sound pressure level of noise provided by the first embodiment of the present application
  • FIG. 2 is a schematic structural diagram of a total noise pressure level measurement system provided by a second embodiment of the present application.
  • FIG. 3 is a schematic diagram of time-domain signals and frequency-domain energies of the present application when a standard sound signal (1 kHz) with a total sound pressure level of 94 dB is used to verify the application.
  • the first embodiment of the present application relates to a method for measuring the total sound pressure level of noise.
  • the specific process is shown in FIG. 1 and includes the following steps:
  • Step S101 Acquire a time-domain digital signal of a noise sound pressure signal.
  • the noise is collected by the microphone, and the microphone outputs the voltage signal v[t]; the voltage signal v[t] is input to the signal collection device for processing, and the signal collection device outputs the voltage signal v[t] Time domain digital signal v[n]; according to the microphone sensitivity parameter sens, and time domain digital signal v[n], the time domain digital signal Pa[n] of the noise sound pressure signal is calculated, the specific calculation formula is as follows:
  • Pa[n] is the sound pressure signal of noise
  • v[n] is the voltage signal of noise
  • sens is the sensitivity parameter of the microphone.
  • Step S102 Acquire the frequency domain signal of the sound pressure signal.
  • the frequency domain signal Pa[f] of the sound pressure signal can be obtained by the time domain signal Pa[n] through a fast discrete Fourier transform FFT with a transform interval length of N. It can be understood that there are many methods of time-frequency transform, such as Fourier transform, etc., which will not be repeated here.
  • Step S103 Acquire the effective value of the sound pressure of the sound pressure signal according to the frequency domain signal and according to Pasval's law.
  • the square sum of the frequency domain signal Pa[f] in the transformation interval N is obtained According to the sum of squares And transform the length N of the interval to calculate the energy sum of the time-domain digital signal of the sound pressure signal, and the energy sum is the effective value of the time-domain digital signal of the sound pressure signal.
  • the specific calculation formula is:
  • E is the energy sum of the time-domain digital signal of the sound pressure signal
  • X[n] is the frequency-domain signal
  • N is the length of the transformation interval
  • X[k] is the frequency domain signal corresponding to the time domain signal x[n]
  • both are time-frequency transformed by N-point FFT
  • is the average of the time domain signal x[n]
  • the square root is the effective value of the time domain signal x[n].
  • Pa[f] is X[k] in the formula
  • Pa[n] is x[n] in the formula
  • E is the effective value RMS
  • E 2 is obtained from the frequency domain signal Pa[f]
  • E is The effective value of the sound pressure of the sound pressure signal Pa[n].
  • Step S104 Convert the effective value of the sound pressure into the total sound pressure level of the noise.
  • Lp is the sound pressure level
  • P is the sound pressure
  • P 0 is the reference sound pressure of 20 ⁇ Pa
  • E the total sound pressure level corresponding to the effective value E of the sound pressure
  • a method for measuring the total sound pressure level of noise directly obtains the time-domain digital signal of the noise sound pressure signal, and obtains the frequency-domain signal according to the time-domain digital signal.
  • the effective value of the sound pressure of the sound pressure signal can be directly obtained according to the frequency domain signal, and then the effective value of the sound pressure is converted into the total sound pressure level of the noise.
  • the effective value of the sound pressure signal can be obtained, which is the effective value of sound pressure.
  • the total sound pressure level of the noise can be obtained.
  • the second embodiment of the present application relates to a system for measuring the total sound pressure level of noise, as shown in FIG. 2, including: at least one processor 201; and a memory 202 communicatively connected to the at least one processor 201; wherein, the memory 202 stores There are instructions executable by the at least one processor 201, and the instructions are executed by the at least one processor 201 to enable the at least one processor 201 to execute the noise total sound pressure level measurement method as described above.
  • the bus may include any number of interconnected buses and bridges.
  • the bus connects one or more processors 201 and various circuits of the memory 202 together.
  • the bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be described further herein.
  • the bus interface provides an interface between the bus and the transceiver.
  • the transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on the transmission medium.
  • the data processed by the processor 201 is transmitted on the wireless medium through the antenna. Further, the antenna also receives the data and transmits the data to the processor 201.
  • the processor 201 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory 202 may be used to store data used by the processor 201 when performing operations.
  • the third embodiment of the present application relates to a computer-readable storage medium that stores a computer program.
  • the computer program is executed by the processor, the above method embodiments are implemented.
  • a program which is stored in a storage medium and includes several instructions to make a device ( It may be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

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Abstract

一种噪音总声压级测量方法、系统及计算机可读存储介质，涉及声学领域。该噪音总声压级测量方法，包括步骤：获取噪音的声压信号的时域数字信号（S101）；根据声压信号的时域数字信号，获取声压信号的频域信号（S102）；根据频域信号、依据帕斯瓦尔定律，获取声压信号的声压有效值（S103）；将声压有效值转换为噪音的总声压级（S104）。该噪音总声压级测量方法具有测量速度较快的优点。

Description

一种噪音总声压级测量方法、系统及计算机可读存储介质 【技术领域】
本申请实施例涉及声学领域，尤其涉及一种噪音总声压级测量方法、系统及计算机可读存储介质。
【背景技术】
目前，随着电子技术的发展，移动通信终端装置如手机等的来电无声提示需要靠机身的振动来提醒用户，而产生振动的部件为内置的微型直线振动马达，另外振动按摩器等小型医疗保健设备的核心器件也为内置一微型直线振动马达。马达在运行的过程中会产生噪音，并且噪音在一定程度上也能反映马达的运行情况。
总声压级作为噪音的一个重要特征数据，现有技术中通常采用倍频程累加的方法进行测量。然而，本申请的发明人发现，采用倍频程累加的方法在每次累加之前，都需要对噪音信号进行滤波，导致计算量较大，测量速度较慢。
【申请内容】
基于此，有必要提供一种噪音总声压级测量方法，本申请实施方式的目的在于提供一种噪音总声压级测量方法、系统及计算机可读存储介质，其测量速度较快。
一种噪音总声压级测量方法，包括：获取噪音的声压信号的时域数字信号；根据所述声压信号的时域数字信号，获取所述声压信号的频域信号；根据所述频域信号、依据帕斯瓦尔定律，获取所述声压信号的声压有效值；将所述声压有效值转换为所述噪音的总声压级。
本申请的实施方式还提供了一种噪音总声压级测量方法，包括：至少 一个处理器；以及，与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行前述的噪音总声压级测量方法。
本申请的实施方式还提供了一种计算机可读存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现前述的噪音总声压级测量方法。
本申请实施方式相对于现有技术而言，获取噪音的声压信号的时域数字信号，根据时域数字信号，获取频域信号，根据频域信号即可直接获取声压信号的声压有效值，然后将声压有效值转换为噪音的总声压级。通过对获取的噪音的声压信号进行时频转换，依据帕斯瓦尔定律揭示的时域信号和频域信号之间的关系，即可获取声压信号的有效值，即为声压有效值，将所述声压的有效值进行转换，即可获得噪音的总声压级。通过依据帕斯瓦尔定律中的时域信号和频域信号之间的关系，获取声压有效值，无需进行滤波处理，计算较为简便，测量速度较快。
另外，所述获取噪音的声压信号的时域数字信号，具体为：通过麦克风采集所述噪音、并输出电压信号；将所述电压信号经过信号采集设备处理，获取所述电压信号的时域数字信号；根据所述电压信号的时域数字信号以及所述麦克风的灵敏度参数，计算得到所述噪音的声压信号的时域数字信号。
另外，所述根据所述声压信号的时域数字信号，获取所述声压信号的频域信号，具体为：对所述声压信号的时域数字信号进行变换区间长度为N的快速离散傅里叶变换，计算得到所述声压信号的频域信号。通过快速离散傅里叶变换进行声压信号的时域-频域转换，计算较为简单，进一步的提升运算速度。
另外，所述根据所述频域信号、依据帕斯瓦尔定律，获取所述声压信号的声压有效值，具体为：求取所述频域信号在所述变换区间内的平方和；根据所述平方和以及所述变换区间长度N，计算得到所述声压信号的时域数字信号的能量和；所述能量和即为所述声压信号的声压有效值。
另外，所述根据所述平方和以及所述变换区间长度N，计算得到所述声压信号的时域数字信号的能量和，具体包括：通过以下公式计算所述能量的平方和：
Figure PCTCN2019113868-appb-000001
其中，E为所述声压信号的时域数字信号的能量和，X[n]为所述频域信号，N为所述变换区间长度；将所述能量和的平方进行开二次方，计算得到所述能量和。
另外，所述将所述声压有效值转换为所述噪音的总声压级，具体为：根据所述声压有效值以及声压与声压级之间的转换公式，计算得到所述噪音的总声压级，其中，所述声压与声压级之间的转换公式为：
Figure PCTCN2019113868-appb-000002
其中，Lp为声压级，P为声压，P 0为基准声压20μPa。
【附图说明】
图1是本申请第一实施方式所提供的噪声总声压级测量方法的程序流程图；
图2是本申请第二实施方式所提供的噪声总声压级测量系统的结构示意图。
图3为采用总声压级为94dB的标准声音信号(1kHz)对本申请进行验时的时域信号和频域能量示意图。
【具体实施方式】
为使本申请实施例的目的、技术方案和优点更加清楚，下面结合附图和实施方式对本申请作进一步说明。然而，本领域的普通技术人员可以理解，在本申请各实施方式中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请所要求保护的技术方案。
本申请的第一实施方式涉及一种噪音总声压级测量方法，具体流程如图1所示，包括以下步骤：
步骤S101：获取噪音的声压信号的时域数字信号。
具体的，在本步骤中，通过麦克风采集噪音，由麦克风输出电压信号v[t]；将此电压信号v[t]输入信号采集设备进行处理，信号采集设备输出该电压信号v[t]的时域数字信号v[n]；根据麦克风的灵敏度参数sens，和时域数字信号v[n]计算得到噪音的声压信号的时域数字信号Pa[n]，具体计算公式如下：
Figure PCTCN2019113868-appb-000003
其中，Pa[n]为噪音的声压信号，v[n]为噪音的电压信号，sens为麦克风的灵敏度参数。
可以理解的是，上述步骤仅为本实施方式中的一种具体实现方式的举例说明，并不构成限定。
步骤S102：获取所述声压信号的频域信号。
具体的，在本步骤中，所述声压信号的频域信号Pa[f]可以通过时域信号Pa[n]通过变换区间长度为N的快速离散傅里叶变换FFT求得。可以理解的是，时频变换的方法还有很多，如傅里叶变换等，在此不进行赘述。
步骤S103：根据所述频域信号、依据帕斯瓦尔定律，获取所述声压信号的声压有效值。
具体的，在本步骤中，求取频域信号Pa[f]在变换区间N内的平方和
Figure PCTCN2019113868-appb-000004
根据平方和
Figure PCTCN2019113868-appb-000005
和变换区间长度N，计算得到声压信号的时域数字信号的能量和，所述能量和即为声压信号的时域数字信号的有效值。具体计算公式为：
Figure PCTCN2019113868-appb-000006
其中，E为所述声压信号的时域数字信号的能量和，X[n]为所述频域信号，N为所述变换区间长度。下面，对上述计算公式
Figure PCTCN2019113868-appb-000007
进行验证，具体步骤如下：
设X[k]是与时域信号x[n]对应的频域信号，两者通过N点的FFT进行时频变换。根据帕斯瓦尔定律，两者在能量上有如下关系(符合能量守恒)：
Figure PCTCN2019113868-appb-000008
则有：
Figure PCTCN2019113868-appb-000009
其中，X[k]是与时域信号x[n]对应的频域信号，两者通过N点的FFT进行时频变换，RMS |x[n]|为时域信号x[n]的均方根，即为时域信号x[n]的有效值。
在本步骤中，Pa[f]即为公式中的X[k]，Pa[n]为公式中的x[n]，E即为有效值RMS |x[n]|。
根据频域信号Pa[f]求得E 2后，对E 2开二次方即可求得声压信号Pa[n]的有效值E，由于Pa[n]为声压信号，则E为声压信号Pa[n]的声压有效值。
步骤S104：将所述声压有效值转换为所述噪音的总声压级。
具体的，在本步骤中，根据声压与声压级的转换公式
Figure PCTCN2019113868-appb-000010
Figure PCTCN2019113868-appb-000011
其中，Lp为声压级，P为声压，P 0为基准声压20μPa，求取声压有效值E对应的总声压级。
与现有技术相比，本申请第一实施方式所提供的一种噪音总声压级测 量方法，直接获取噪音的声压信号的时域数字信号，根据时域数字信号，获取频域信号，根据频域信号即可直接获取声压信号的声压有效值，然后将声压有效值转换为噪音的总声压级。通过对获取的噪音的声压信号进行时频转换，依据帕斯瓦尔定律揭示的时域信号和频域信号之间的关系，即可获取声压信号的有效值，即为声压有效值，将所述声压的有效值进行转换，即可获得噪音的总声压级。通过帕斯瓦尔定律揭示的时域信号和频域信号能量之间的关系，获取声压有效值，从而求取总声压级，无需进行滤波处理，计算较为简便，测量速度较快。
下面，采用总声压级为94dB的标准声音信号(1kHz)进行验证，采用上述流程，时域信号和频域能量如图3所示。
本申请第二实施方式涉及一种噪音总声压级测量系统，如图2所示，包括：至少一个处理器201；以及，与至少一个处理器201通信连接的存储器202；其中，存储器202存储有可被至少一个处理器201执行的指令，指令被至少一个处理器201执行，以使至少一个处理器201能够执行如上述噪音总声压级测量方法。
其中，存储器202和处理器201采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器201和存储器202的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器201处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传送给处理器201。
处理器201负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器202可以被用于存储处理器201在执行操作时所使用的数据。
本申请第三实施方式涉及一种计算机可读存储介质，存储有计算机程序。计算机程序被处理器执行时实现上述方法实施例。
即，本领域技术人员可以理解，实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上的仅是本申请的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本申请创造构思的前提下，还可以做出改进，但这些均属于本申请的保护范围。

Claims (8)

  1. 一种噪音总声压级测量方法，其特征在于，包括：
    获取噪音的声压信号的时域数字信号；
    根据所述声压信号的时域数字信号，获取所述声压信号的频域信号；
    根据所述频域信号、依据帕斯瓦尔定律，获取所述声压信号的声压有效值；
    将所述声压有效值转换为所述噪音的总声压级。
  2. 根据权利要求1所述的噪音总声压级测量方法，其特征在于，所述获取噪音的声压信号的时域数字信号，具体为：
    通过麦克风采集所述噪音、并输出电压信号；
    将所述电压信号经过信号采集设备处理，获取所述电压信号的时域数字信号；
    根据所述电压信号的时域数字信号以及所述麦克风的灵敏度参数，计算得到所述噪音的声压信号的时域数字信号。
  3. 根据权利要求1所述的噪音总声压级测量方法，其特征在于，所述根据所述声压信号的时域数字信号，获取所述声压信号的频域信号，具体为：
    对所述声压信号的时域数字信号进行变换区间长度为N的快速离散傅里叶变换，计算得到所述声压信号的频域信号。
  4. 根据权利要求3所述的噪音总声压级测量方法，其特征在于，所述根据所述频域信号、依据帕斯瓦尔定律，获取所述声压信号的声压有效值，具体为：
    求取所述频域信号在所述变换区间内的平方和；
    根据所述平方和以及所述变换区间长度N，计算得到所述声压信号的时域数字信号的能量和；
    所述能量和即为所述声压信号的声压有效值。
  5. 根据权利要求4所述的噪音总声压级测量方法，其特征在于，所述 根据所述平方和以及所述变换区间长度N，计算得到所述声压信号的时域数字信号的能量和，具体包括：
    通过以下公式计算所述能量的平方和：
    Figure PCTCN2019113868-appb-100001
    其中，E为所述声压信号的时域数字信号的能量和，X[n]为所述频域信号，N为所述变换区间长度；
    将所述能量和的平方进行开二次方，计算得到所述能量和。
  6. 根据权利要求1所述的噪音总声压级测量方法，其特征在于，所述将所述声压有效值转换为所述噪音的总声压级，具体为：
    根据所述声压有效值以及声压与声压级之间的转换公式，计算得到所述噪音的总声压级，其中，所述声压与声压级之间的转换公式为：
    Figure PCTCN2019113868-appb-100002
    其中，Lp为声压级，P为声压，P 0为基准声压20μPa。
  7. 一种噪音总声压级测量系统，其特征在于，包括：
    至少一个处理器；以及，
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求1至6中任一所述的噪音总声压级测量方法。
  8. 一种计算机可读存储介质，存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现权利要求1至6中任一所述的噪音总声压级测量方法。
PCT/CN2019/113868 2018-12-31 2019-10-29 一种噪音总声压级测量方法、系统及计算机可读存储介质 Ceased WO2020140593A1 (zh)

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