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

[0084] A noise reduction method for range hoods using Hilbert-Huang 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, specifi...

[0123] A range hood with Hilbert-Huang 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 assemb...

[0147] A range hood with Hilbert-Huang transform for noise reduction, other features are the same as those of 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.