Background noise energy eliminating measurement method of reverberation time of factory building

A technology of background noise and reverberation time, which is used in the measurement of reverberation time, measurement devices, and measurement of ultrasonic/sonic/infrasonic waves, etc. It can solve the problems that auxiliary equipment cannot be turned off, cannot be eliminated, and strong background interference noise.

Active Publication Date: 2017-05-31
JIANGSU UNIV
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Problems solved by technology

[0003] Some factories need to measure the reverberation time in the factory building during the later reconstruction, but some auxiliary e...

Method used

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  • Background noise energy eliminating measurement method of reverberation time of factory building
  • Background noise energy eliminating measurement method of reverberation time of factory building
  • Background noise energy eliminating measurement method of reverberation time of factory building

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specific Embodiment

[0053] S01: Arrange three groups of microphones in the factory building, generate pulse excitation sources through starting guns or firecrackers, use the microphones to collect reverberation sound signals, and the sampling frequency is f c =51200, the number of sampling points N=2048000, import the collected signal into the computer for analysis;

[0054] S02: Select the octave center frequency f according to GBT 50076-2013 m =125×2 m Hz, where 0≤m≤5, first select when m=0, f m =f 0 = 125Hz;

[0055] S03: For the signals collected by the first group of microphones, f 0The corresponding frequency band (90Hz~180Hz) is filtered to obtain the sound pressure signal p at this center frequency 0 (τ), such as figure 1 shown;

[0056] S04: From p 0 In (τ), select a sufficiently long background noise signal in the late stationary stage for energy integration, and obtain the average value of the noise energy per unit time

[0057]

[0058] In the formula: t 3 It is the tim...

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Abstract

The invention provides a background noise energy eliminating measurement method of a reverberation time of a factory building. The method comprises the following steps of arranging a microphone in the factory building, giving out pulse response excitation through a sound source, and collecting a reverberation sound signal by using the microphone; selecting octave center frequency; filtering a frequency range corresponding to the collected signal, so as to obtain a sound pressure signal under the center frequency; choosing one segment of long enough background noise signals at a later-period stable stage to carry out energy integration, so as to obtain a noise energy average value per a unit time; choosing a long enough signal at a reverberation decay-period stage, so as to obtain an attenuation-period sound energy value after background noise energy is eliminated; linearly fitting a sound pressure level decay curve, so as to obtain a fitted gradient, and calculating the reverberation time through the gradient. By using the method, the influence of background interference noise on the measurement of the reverberation time can be removed; the method is applied to a factory building in which the background interference noise exits; the reverberation time of the factory building is measured.

Description

technical field [0001] The invention relates to the field of acoustic measurement, in particular to a method for measuring the reverberation time of a factory building by eliminating background noise energy. Background technique [0002] The reverberation effect is produced by multiple consecutive reflections of sound from surrounding walls in an enclosed space. An important parameter to describe the strength of the reverberation effect is the reverberation time. Reverberation time is not only a physical quantity describing the speed of sound attenuation in a closed space, but also an important objective evaluation parameter in sound effect design. The common measurement methods of reverberation time include steady-state sound field cut-off method, impulse response integration method, etc. [0003] Some factories need to measure the reverberation time in the factory building during the later reconstruction, but some auxiliary equipment cannot be turned off, resulting in st...

Claims

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Application Information

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IPC IPC(8): G01H7/00
CPCG01H7/00
Inventor 赵晓丹程惠闫凯孙黎明
Owner JIANGSU UNIV
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