A semi-anechoic box for broadband measurement

A wide-band, box-type technology, which is applied in the field of semi-nechoic boxes for wide-band measurement, can solve the problem that the sound absorption effect of sound-absorbing cotton cannot be compared, and achieve the effects of convenient product quality inspection, noise reduction, and ensuring measurement speed

Active Publication Date: 2018-07-06
NANJING LANGSHENG ACOUSTIC TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the sound absorption effect of sound-absorbing cloth wrapped with sound-absorbing cotton is far from being comparable to that of the anechoic room.

Method used

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  • A semi-anechoic box for broadband measurement

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Embodiment Construction

[0017] As shown in the figure, the sound-diffusing composite structure 1, the second sound-diffusing composite structure 2 in the lower layer of the tube, the upper test cover 3, the installation hole of the baffle plate 4, the microphone bracket 5, the outer sound insulation layer 6, the damping and Sound-absorbing layer 7 , resonant sound-absorbing layer 8 , inner layer sound-absorbing material 9 , vibration isolation device or universal wheel 10 .

[0018] A semi-anechoic box for broadband measurement, comprising a cylindrical box body; wherein a measurement microphone bracket is arranged in the center of the box body, and is arranged on the inner walls of all sides of the box body except the side where the object to be measured (such as a loudspeaker, mobile phone, etc.) is installed Sound-absorbing materials or sound-absorbing structures, so that the space between the microphone and the surface of the sound-absorbing material or sound-absorbing structure is more than 20cm....

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Abstract

A semi-anechoic box for broadband measurement, comprising a cylindrical box body; a measuring microphone is arranged in the center of the box body, and sound-absorbing materials or sound-absorbing structures are arranged on the inner walls of the box body except for the surface where the object to be measured is installed, so that The space distance between the microphone and the surface of the sound-absorbing material or sound-absorbing structure is more than 20cm. The space separation distance is related to the lowest measurement frequency of the measurement. The lower the minimum measurement frequency, the greater the space separation distance. The internal cross-section of the cylindrical box of the present invention is polygonal; the cross-section of the outer box is rectangular. The box body includes sound insulation and sound absorption materials, which occupies a small space and does not require a large special test room. It is easy to use, convenient for large-scale product quality testing, and reduces production and testing costs; Easy to operate; due to the good sound insulation performance, the measuring device is less affected by external interference, so the test accuracy is high, the test data repeatability is good, and it can be used in many different environments.

Description

1. Technical field [0001] The invention relates to a semi-anechoic box for broadband measurement, or an anechoic device which approximates the measurement effect of a semi-anechoic chamber. 2. Background technology [0002] The acoustic performance of loudspeakers, mobile phones and other sound-generating devices, such as frequency response, total harmonic distortion, etc., is required to be measured under free field (anechoic chamber) or semi-free field (semi-anechoic chamber) conditions. However, the volume of the anechoic chamber or the semi-anechoic chamber is large and the cost is high, especially inconvenient to operate on the production line. Therefore, a semi-anechoic box for wide-band measurement that can simulate the measurement effect of an anechoic room or a semi-anechoic room has become the best choice in the industry. Effect. [0003] Existing technology simulates the measurement of anechoic chamber or semi-anechoic chamber, especially for the acoustic perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 王涵
Owner NANJING LANGSHENG ACOUSTIC TECH
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