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.
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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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