Active noise reduction range hood and noise reduction method thereof

Abstract

The invention relates to an active noise reduction range hood and a noise reduction method thereof. A noise signal is decomposed into multiple sub-band signals, the sub-band signals are converted to obtain band pass filter weight vectors, the obtained band pass filter weight vectors are converted 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 in order to realize noise reduction.The arrangement of a low-damping full sounded or half surrounded structure and a self-adaption function of the active noise reduction range hood achieves the optimization of the performances of the range hood, realizes the completion of working under low-nose running conditions, and solves the technical difficulty of the mutual contradiction between noises and performances, and low noises generated during running of the range hood and no physiologic and mental negative influences on users are achieved 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 an active noise reduction range hood 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-dimensional space, high...

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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