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A method and system for tuneable noise compensation and elimination

A noise compensation and noise technology, applied in the field of tuned noise compensation and elimination, can solve the problems of inability to reduce the audibility of the human ear and poor peak elimination ability, so as to reduce the audibility of the human ear, reduce the influence of noise, and eliminate the The effect of adjusting the noise

Active Publication Date: 2022-08-02
北京绿创声学工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The acoustic performance curves of traditional noise reduction methods (sound absorption, sound insulation, noise elimination, and vibration isolation) basically conform to linear characteristics, but the "peak elimination ability" for the modulated noise components in the total noise is poor, which means that even if the noise reduction After processing, the tonal noise components still exist and cannot reduce the audibility of the human ear (the degree to which the human ear responds to sound stimuli of different frequencies and intensities) to an acceptable range

Method used

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  • A method and system for tuneable noise compensation and elimination
  • A method and system for tuneable noise compensation and elimination
  • A method and system for tuneable noise compensation and elimination

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Experimental program
Comparison scheme
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Embodiment 1

[0023] like figure 1 As shown, the tuneable noise compensation and elimination method provided by this embodiment includes the following steps:

[0024] 1) On-site recording of the total sound including the tune noise in the original sound field, to obtain the noise signal in the actual sound field (ie, the original sound field).

[0025] 2) FFT (Fast Fourier Transform) analysis is performed on the acquired noise signal, and the frequency position and the critical band sound pressure level of the tune noise in the noise signal are identified, wherein the fast Fourier transform analysis is disclosed in the prior art. method, the specific process will not be repeated here, the critical band sound pressure level L of the tune noise pt for:

[0026]

[0027] In the formula, L pit It is the maximum tuneable noise frequency sound pressure level and the adjacent frequency sound pressure level within 10dB (including 10dB) of the difference.

[0028] 3) Calculate the critical ba...

Embodiment 2

[0037] The content of this embodiment is basically the same as that of the first embodiment:

[0038] 1) On-site recording of the total sound including the tune noise in the original sound field, to obtain the noise signal in the actual sound field (ie, the original sound field).

[0039] 2) Perform FFT analysis on the acquired noise signal to identify the frequency position and critical band sound pressure level of the modulated noise in the noise signal.

[0040] 3) Calculate the critical band sound pressure level L of the tunable noise pt Critical band sound pressure level L with masking noise pn The difference ΔL of ΔL, if ΔL≤2dB, keep the status quo; if ΔL>2dB, go to step 4).

[0041] 4) Obtain the critical band sound pressure level that needs to be compensated.

[0042] 5) In the original sound field, the critical frequency band sound pressure level that needs to be compensated is emitted through the secondary sound source, and the critical frequency band sound pressu...

Embodiment 3

[0047] Based on the first embodiment, this embodiment provides a tuneable noise compensation and elimination system, including a microphone, an FFT analysis module, a difference calculation module, a first noise signal analysis module, a sound reinforcement device, and a verification module.

[0048] The microphone is used to record the total sound in the original sound field including the tonal noise, and obtain the noise signal in the actual sound field.

[0049] The FFT analysis module is used to perform FFT analysis on the acquired noise signal, and identify the frequency position of the modulated noise in the noise signal and the critical band sound pressure level L pt .

[0050] The difference calculation module is used to calculate the critical band sound pressure level L of the tunable noise pt Critical band sound pressure level L with masking noise pn The difference ΔL.

[0051] The first noise signal analysis module is configured to obtain the critical-band sound ...

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Abstract

The present invention relates to a method and a system for compensating and eliminating tuneable noise, which is characterized by comprising the following contents: 1) identifying the frequency position and critical band sound pressure level of tuneable noise in a noise signal of an original sound field; 2) calculating tuned noise The difference between the critical band sound pressure level of the noise and the critical band sound pressure level of the masking noise, if the difference is less than or equal to the preset threshold, keep the status quo; if the difference is greater than the threshold, go to step 3); frequency band sound pressure level; 4) In the original sound field, the critical frequency band sound pressure level that needs to be compensated is emitted by the secondary sound source, and the critical frequency band sound pressure level that needs to be compensated is superimposed with the critical frequency band sound pressure level of the tuneable noise. The superimposed critical band masking noise; 5) Calculate the difference between the critical band sound pressure level of the tuneable noise and the superimposed critical band masking noise, if the difference is less than or equal to the threshold, keep the status quo; if the difference is greater than the threshold, go to step 3 ), the present invention can be widely used in the field of noise reduction.

Description

technical field [0001] The present invention relates to a tuneable noise compensation and elimination method and system, and belongs to the field of noise reduction. Background technique [0002] In real life, if the noise is classified according to the distribution of frequency components, it can be divided into broadband noise, narrowband noise and tuned noise, wherein tuned noise is defined as the audible sound that originates from the total sound and has a single frequency characteristic, such as diesel Generator sets and power transformers (reactors, capacitors), etc., all have regulated noise in their noise components. After actual testing and analysis, it is found that regulated noise is an important reason for the phenomenon that the noise control is still disturbing the residents. [0003] The acoustic performance curve of traditional noise reduction methods (sound absorption, sound insulation, noise reduction, and vibration isolation) basically conforms to linear ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/178
CPCG10K11/1785G10K11/1781
Inventor 蒋昭旭郭宇春
Owner 北京绿创声学工程股份有限公司
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