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Hilbert transform noise reduction range hood and noise reduction method thereof

A technology for oil fume and noise reduction, applied in the fields of oil fume removal, heating method, and household heating, etc., can solve the problems of inability to adapt to high-order sound, difficulty in noise reduction, and difficulty in increasing noise reduction in three-dimensional space.

Active Publication Date: 2018-11-30
FOSHAN VIOMI ELECTRICAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Hilbert transform noise reduction range hood and noise reduction method thereof
  • Hilbert transform noise reduction range hood and noise reduction method thereof
  • Hilbert transform noise reduction range hood and noise reduction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A noise reduction method for range hoods using Hilbert transform noise reduction, such as Figure 1-2 shown, including the following steps:

[0085] Step 1. Determine and fix the positions of A noise collecting sensors 221, Q error feedback sensors 232 and K speakers 222;

[0086] Step 2, determine the transfer function T from the initial noise source to the noise collection sensor 221 1 , the transfer function T of the loudspeaker 222 to the target noise reduction space 2 and the transfer function T of the noise acquisition sensor 221 to the target noise reduction space 3 ;

[0087] Step 3, A noise collection sensors 221 respectively collect the signals of the noise collection sensors 221 in the area where they are located in the inner space of the hood, specifically R 1 (n),...,R i (n),...,R A (n), 4≤i≤A, i is a positive integer,

[0088] Q error feedback noise sensors collect the signals of the error feedback sensors 232 in the area respectively, specifically ...

Embodiment 2

[0123] A range hood with Hilbert transform noise reduction, such as Figures 3 to 11 As shown, a hood main body 1 and a three-dimensional sound field noise reduction device 2 for active noise reduction are provided, and the three-dimensional sound field noise reduction device 2 is assembled inside the hood main body 1 .

[0124] The main body 1 of the range hood is provided with a low damping bellows 11 for reducing broadband vibration, and the low damping bellows 11 is assembled inside the main body 1 of the range hood.

[0125] The low-damping bellows 11 is provided with a plurality of bellows plates and a noise filtering device 111 , the multiple bellows plates are spliced ​​to form a three-dimensional structure, and the noise filtering device 111 is assembled on the inner surface of the bellows plates.

[0126] The main body 1 of the hood is also provided with an exhaust assembly 12 , which is assembled inside the low-damping bellows 11 .

[0127] The exhaust assembly 12 ...

Embodiment 3

[0147] A range hood with Hilbert transform noise reduction, other features are the same as in Embodiment 2, the difference is that the outer surface of the low-damping bellows 11 of this embodiment is equipped with a foam board.

[0148] It should be noted that the outer surface of the low-damping bellows 11 of the present invention may be equipped with a foam board, or any one of a foam board or a rubber board.

[0149] The role of the foam board, foam board or rubber board is to block the noise from spreading to the outside, thereby reducing the noise level.

[0150] Compared with Embodiment 2, the noise reduction effect of the range hood of this embodiment is better.

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Abstract

The invention discloses a Hilbert transformation noise reduction range hood and a noise reduction method thereof. A noise signal is decomposed into multiple sub-band signals, the sub-band signals areconverted 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 Hilbert transformation noise reduction range hood achieves the optimizationof the performances of the range hood, completes 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 a range hood for Hilbert 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-dimension...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24C15/20
CPCF24C15/2021F24C15/2035Y02B30/70
Inventor 陈小平林勇进李健鹏李思成
Owner FOSHAN VIOMI ELECTRICAL TECH
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