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Sound environment quality judgment method in brainwork working state

A technology for environmental quality and mental labor, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, speech analysis, etc., can solve problems such as inability to be completed by one person, a large number of instruments and equipment, and difficult measurement, to save the cost of measurement and manpower, the effect of high convenience

Pending Publication Date: 2021-12-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) The index representing the spatial information, namely: the spatial attenuation rate of speech sound D 2.S , A sound level L at the sound source 4m p.A.S.4m , distraction distance r D , STI at the nearest station, privacy distance r p , a large number of instruments and equipment are required for measurement, and the measurement is difficult
Measurements when the crowd is working normally will interfere with the normal work of the crowd in the space, so empty-field measurement is routinely used, and there are two problems in the measurement: on the one hand, the noise is artificially played during the open-field measurement, which is different from the actual situation; on the other hand , a large number of instruments and equipment need to be carried during the measurement, and it cannot be completed by one person
[0007] (3) At the current stage, the above-mentioned indicators representing spatial information are selected and measured with the goal of measuring the acoustic environment quality of a typical open office space, so their scope of application is limited

Method used

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  • Sound environment quality judgment method in brainwork working state

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Experimental program
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Effect test

Embodiment 1

[0054] Step 1: The quality of the acoustic environment is determined when people in the open office space of a state-owned enterprise are performing mental work. Acoustic environment signals of the open office space are collected for 5 minutes when a group of people are in the state of mental work; the collection point is set at the aisle of the open office space 1.2 meters above the ground; the collection point is 1.5 meters away from the most edge seated person in the space meters; the straight line distance from the collection point to the wall is much greater than 1.5 meters, and there is no large reflective surface around; the equipment used to collect sound signals is a dual-channel sound signal collection earphone (model Head BHSII / SQoBold, Head Sound Technology Trading (Shanghai) Limited), the sampling frequency is 44.1kHz.

[0055] Step 2: Convert the collected sound signals into digital signals, and extract three index parameters to measure the quality of the acousti...

Embodiment 2

[0061] Step 1: The quality of the acoustic environment is judged when people in a closed small office of a certain school are engaged in mental work. Acoustic environment signals of the open office space are collected for 5 minutes when a group of people are in the state of mental work; the collection point is set at the aisle of the open office space 1.2 meters above the ground; 1 meter away from the nearest seated person; the collection point The straight-line distance from the wall is 1.8 meters, and there is no large reflective surface around; the equipment used to collect sound signals is a two-channel sound signal collection earphone (model Head BHSII / SQoBold, Head Sound Technology Trading (Shanghai) Co., Ltd.), its The sampling frequency is 44.1kHz.

[0062] Step 2: Convert the collected sound signal into a digital signal, and extract three index parameters for predicting the quality of the acoustic environment under mental work conditions, including: L 10 , L 10 -L ...

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Abstract

The invention discloses a sound environment quality judgment method in a brain labor working state. The method comprises the following steps: collecting sound signals of a space environment when a crowd is in a complex cognition, namely a brain labor working state; converting the collected sound signals into digital signals, and carrying out calculation and identification of three index parameters of L10, L10-L90 and existence of burst noise, including calculation of the value of the index parameter L10, calculation of the value of the index parameter L10-L90 and identification of existence of the burst noise of the index parameters being 'YES' or 'NO'; and (3) carrying out quality judgment on the sound environment. According to the method, the problems that the difference between the sound environment quality measured by a single equivalent continuous A sound level (LAeq) and the actual feeling of people is large, and the measurement result error is large in the traditional method are solved; the problems that a large amount of manpower and equipment are needed and measurement difficulty is large when indexes representing spatial information are used for measuring the sound environment quality are solved, and the problem that measurement of the sound environment quality through the spatial information indexes is limited by space is solved.

Description

technical field [0001] The invention belongs to the field of acoustic environment quality monitoring, in particular to a method for judging the acoustic environment quality when a crowd is in a complex cognitive working state. Based on the method of the invention, an acoustic environment monitoring system can be established to determine whether the acoustic environment is suitable for people to perform complex cognitive work. Background technique [0002] Acoustic environmental quality monitoring is an essential part of urban noise control, and the purpose of timely taking control measures can be achieved by predicting the acoustic environmental quality. For a long time, the determination of the quality of the acoustic environment at work has been aimed at not affecting cognitive performance. Under the guidance of cognitive performance, the equivalent continuous A sound level (L Aeq ) is the main index to measure the quality of the acoustic environment and predict the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G10L25/51
CPCG01H17/00G10L25/51
Inventor 马蕙陈静王超
Owner TIANJIN UNIV