Range hood with detachable three-dimensional space sound field noise reduction device, and noise reduction method thereof

Abstract

The invention discloses a range hood with a detachable three-dimensional space sound field noise reduction device, and a noise reduction method thereof. The range hood is provided with a range hood main body and the detachable three-dimensional space sound field noise reduction device for active noise reduction, and the detachable three-dimensional space sound field noise reduction device is assembled in the range hood main body. A detachable error return sensor dismounted from the range hood in the late noise reduction stage does not affect the noise reduction effect and saves the cost. The range hood decomposes a noise signal into a plurality of sub-band signals, the sub-band signals are converted to obtain band pass filter weight vectors, the obtained band pass filter weight vectors areconverted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmitted to corresponding loudspeakers, and sound waves generated by the corresponding loudspeakers can reduce or offset noise sound waves generated by the range hood. The range hood overcomes the technical difficulty of mutual contradiction between noises and performances, and realizes small noises generated during the running of the range hood and no physiological and metal negative influences on users without sacrificing the smoke suction performance of the range hood.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a range hood with a detachable three-dimensional sound field noise reduction device and a noise reduction method. Background technique [0002] The current active noise reduction technology, such as the application of earphones, is a point-to-point noise reduction technology, that is, directional noise reduction, which cannot effectively eliminate noise in a large range. These techniques focus on eliminating one-dimensional plane sound waves in closed small ducts or small spaces, and are effective in the low frequency range (less than 500Hz). In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order sou...

AI Technical Summary

Problems solved by technology

In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order acoustic modes

But in three-dimensional space, high-order acoustic modes cannot be ignored, especially in closed large-space pipelines, noise reduction is very difficult and complicated

Usually, a variety of standing waves and a variety of sound waves in different directions interfere with each other and superimpose, which greatly increases the difficulty of noise reduction in three-dimensional space

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