Range hood capable of achieving Hilbert-Huang transformation noise reduction and noise reduction method

Abstract

The invention provides a range hood capable of achieving Hilbert-Huang transformation noise reduction and a noise reduction method. The method comprises the steps that a noise signal is decomposed into multiple sub-band signals, and a band-pass filter weight vector is obtained after transformation is conducted; the obtained band-pass filter weight vector is transformed to generate a sound field ofa corresponding loudspeaker, and then equal-strength sound wave signals are transmitted to the corresponding loudspeakers; and noise reduction is achieved by reducing or offsetting noise waves generated by a range hood through sound waves generated by the corresponding loudspeakers. According to the range hood capable of achieving Hilbert-Huang transformation noise reduction, optimization of therange hood performance is achieved by means of a low-damping full-surrounded structure or half-surrounded structure and setting of a self-adaptation function, and meanwhile working is completed undera low-noise operation condition, so that the technological difficulty that mutual contradiction exists between the noise and the performance is solved; and on the premise that the smoke-adsorption performance of the range hood is not sacrificed, the noise generated in the range hood operation process is low, and no negative effect on physiology and psychology of a user is caused.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a range hood with Hilbert-Huang transform noise reduction 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 modes. But in three-di...

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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