Noise reduction device and exhausting assembly linked range hood, and noise reduction method thereof

Abstract

The invention discloses a noise reduction device and exhausting assembly linked range hood, and a noise reduction method thereof. The range hood is provided with a range hood main body, an exhaustingassembly and a three-dimensional space sound field noise reduction device for active noise reduction, and the exhausting assembly and the three-dimensional space sound field noise reduction device arerespectively assembled in the range hood main body. The exhausting assembly is in linkage connection with the three-dimensional space sound field noise reduction device. A noise signal is decomposedinto multiple sub-band signals, the sub-band signals are converted to obtain a band pass filter weight vector, the obtained band pass filter weight vector is converted to generate a corresponding loudspeaker sound field, the equal-intensity sound wave signal is transmitted to a corresponding loudspeaker, and sound waves generated by the corresponding loudspeaker can reduce or offset noise sound waves generated by the range hood in order to realize noise reduction. 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 performances of the range hood.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a range hood in which a noise reduction device is linked with an exhaust assembly 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 sound...

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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