Control device and method for reducing noise inside mute cabin

Abstract

The invention relates to a control device for reducing noise inside a mute cabin, the control device is applied to the mute cabin, a noise source exists outside the mute cabin, the interior of the mute cabin comprises a sound cavity filled with air, and the control device comprises a noise active controller, a secondary sound source, an error microphone and a reference microphone. The noise active controller comprises a first input end, a second input end and an output end, the error microphone is connected to the first input end, the reference microphone is connected to the second input end, and the secondary sound source is connected to the output end; the reference microphone is arranged on the outer wall of the mute cabin, and the noise active controller, the error microphone and the secondary sound source are all arranged on the inner wall of the mute cabin and are not overlapped in position. By adopting the control device, the second noise can be counteracted in a sound silencing mode, and the sound insulation effect of the mute cabin is improved under the condition that the thickness of the cabin wall of the mute cabin does not need to be increased.

Description

technical field [0001] The present application relates to the field of noise control, in particular to a control device and method for reducing noise inside a silent cabin. Background technique [0002] The silent cabin is a way to provide users with a quiet working or resting environment by using a fully enclosed bulkhead for sound insulation in a noisy environment with high noise. In order to achieve a good noise reduction effect in the silent cabin, generally speaking, the lower the noise frequency, the larger the thickness of the bulkhead is required. [0003] At present, the silent cabins on the market still focus on improving sealing, preventing sound leakage, and mid-to-high frequency sound insulation. In addition, due to cost considerations or weight and other restrictions on use, the thickness of the bulkhead and glass door of the silent cabin It should not be too large, so that its sound insulation effect on some noises, especially low-frequency noises, is unsatis...

AI Technical Summary

Problems solved by technology

[0003] At present, the silent cabins on the market still focus on improving sealing, preventing sound leakage, and mid-to-high frequency sound insulation. In addition, due to cost considerations or weight and other restrictions on use, the thickness of the bulkhead and glass door of the silent cabin It should not be too large, so that its sound insulation effect on some noises, especially low-frequency noises, is unsatisfactory

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