Range hood with active noise removal function

Abstract

To provide a range hood having an active noise removal function.SOLUTION: There is provided a range hood having an active noise removal function, which mainly comprises a hood body, a chimney, a fan motor, a sound absorbing material, and an active noise removal system. The fan motor may generate aerodynamic noise during its operation, and the sound absorbing material is used to block or destroy sound waves of the aerodynamic noise, thereby achieving passive noise removal. According to the design of the present invention, the active noise removal system comprises a plurality of reference microphones, a plurality of error microphones, an electronic device, and at least one speaker, and is arranged to achieve active noise removal by collecting sound in the chimney during operation of the fan motor, generating an anti-noise signal through calculation, and then driving the speaker based on the anti-noise signal to emit anti-noise sound into the chimney.SELECTED DRAWING: Figure 2B

Description

[Technical Field]

[0001] The present invention relates to the technical field related to range hoods, and more particularly to range hoods with active noise reduction functions. [Background technology]

[0002] As is well known, range hoods have become an essential piece of equipment in modern kitchens, and are used to exhaust oily smoke, steam, and odors generated during cooking to the outdoors. FIG. 1 is a perspective view of a type of conventional range hood. As shown in FIG. 1, a conventional range hood 1a mainly comprises a hood body 11a, a chimney 12a, a fan motor 13a installed in the chimney 12a, and a fan motor control device.

[0003] During cooking, a user can operate a user interface installed on the hood body, which allows the fan motor control device to control the fan motor 13a to operate. The fan motor 13a collects oily smoke generated during cooking through an opening at the top of the hood body 11a and then discharges the oily smoke outdoors through the chimney 12a. However, practical experience has shown that the fan motor 13a can generate extremely loud aerodynamic noise during operation, which can be unpleasant for the chef in the kitchen or for family members on the balcony or living room adjacent to the kitchen.

[0004] As can be seen from the above description, the prior art range hood 1a is considered to be equipped with an active noise control (ANC) system, and the ANC system is used to adaptively attenuate noise levels generated by the fan motor 13a at different operating speeds. In light of this, the inventors of the present application have conducted extensive research and development, and have finally developed a range hood with such an active noise reduction function. Summary of the Invention [Problem to be solved by the invention]

[0005] The primary objective of the present invention is to provide a range hood with active noise reduction, comprising a hood body, a chimney, a fan motor, sound-absorbing material, and an active noise reduction system. Aerodynamic noise may be generated during operation of the fan motor, and the sound-absorbing material is used to block or destroy the aerodynamic noise, thereby achieving passive noise reduction. According to the design of the present invention, the active noise reduction system comprises a plurality of reference microphones, a plurality of error microphones, an electronic device, and at least one speaker. The active noise reduction system is configured to collect sound from within the chimney during operation of the fan motor, generate an anti-noise signal through calculation, and then activate the speaker to broadcast an anti-noise sound into the chimney based on the anti-noise signal, thereby achieving active noise reduction. [Means for solving the problem]

[0006] In order to achieve the above object, one embodiment of a range hood with an active noise reduction function provided by the present invention comprises a hood body having a top opening, a chimney connected to the top opening via a first opening thereof, a fan motor installed in the chimney and having a first installation position, a sound absorbing material including a first sound absorbing part and a second sound absorbing part, a plurality of first reference microphones, a plurality of error microphones, at least one speaker, and an electronic device connected to the plurality of first reference microphones, the plurality of error microphones, and the at least one speaker, wherein the first sound absorbing part is attached to an inner wall of the chimney and the second sound absorbing part is attached to an inner surface of the hood body, each of the first reference microphones has a second installation position and its head is exposed to the internal space of the chimney as it passes through the first sound absorbing part, and each of the error microphones has a third installation position and its head is exposed to the internal space as it passes through the first sound absorbing part, The speaker has an installation position and is installed so that the speaker is exposed to the interior space through the surround ring of its cone, passing through the first sound-absorbing part, so that the sound generating portion of the speaker faces the interior space. The first installation position is higher than the second installation position, and the second installation position is higher than the third installation position, and the installation position is interposed between the second installation position and the third installation position. The electronic device controls the plurality of first reference microphones to collect a first sound in the interior space and obtain a first analog audio signal, controls the plurality of error microphones to collect a second sound in the interior space and obtain a second analog audio signal, converts the first analog audio signal and the second analog audio signal into a first digital audio signal and a second digital audio signal, and performs active noise attenuation on the first digital audio signal and the second digital audio signal.generating a digital output signal in accordance with performing an attenuating process; converting the digital output signal to an analog output signal; and driving the speaker to broadcast an anti-noise sound into the interior space based on the analog output signal.

[0007] In a feasible embodiment, the range hood with active noise reduction function of the present invention described above may further include a sound-absorbing mat installed vertically in the chimney, and a plurality of second reference microphones installed on the sound-absorbing mat and facing the fan motor, each of the second reference microphones being connected to the electronic device and having a fourth installation position, the fourth installation position being interposed between the first installation position and the second installation position.

[0008] In one embodiment, there is a first distance between the first installation position and the top opening of the hood body, a second distance between the second installation position and the top opening, a third distance between the third installation position and the top opening, and a fourth distance between the fourth installation position and the top opening.

[0009] In one embodiment, the ratio of the second distance to the third distance is in the range of 3 to 5, and the ratio of the fourth distance to the second distance is in the range of 0.3 to 1.3.

[0010] In one embodiment, there is a distance between the installation position and the top opening of the hood body, and the ratio of the distance to the third distance is in the range of 2-4.

[0011] In one embodiment, the chimney is provided with a plurality of first through-holes, a plurality of second through-holes, and at least one third through-hole, so that the plurality of first reference microphones can be correspondingly positioned in the plurality of first through-holes, the plurality of error microphones can be correspondingly positioned in the plurality of second through-holes, and the speaker can be correspondingly positioned in the third through-hole.

[0012] In one embodiment, a mounting frame is provided on the inner wall of the chimney, so that the fan motor can be installed in the chimney through the mounting frame.

[0013] In one embodiment, a protruding edge is provided on the outer surface of the sound-absorbing mat, and a support frame is provided on the inner wall of the chimney, the support frame includes a support plate with a through hole and at least two connecting ribs, connecting the left side edge of the support plate to the inner wall of the chimney via one connecting rib, and connecting the right side edge of the support plate to the inner wall of the chimney via another connecting rib, and the sound-absorbing mat passes through the through hole, and the protruding edge is supported by the support plate.

[0014] In one embodiment, the first sound-absorbing part is provided with a plurality of fourth through holes, a plurality of fifth through holes, and at least one sixth through hole, so that the plurality of first reference microphones can be correspondingly positioned in the plurality of fourth through holes, the plurality of error microphones can be correspondingly positioned in the plurality of fifth through holes, and the speaker can be correspondingly positioned in the sixth through hole.

[0015] In one embodiment, the mounting frame includes at least two connecting plates, and the first sound-absorbing part also has at least two seventh through holes and at least two eighth through holes, so that the at least two connecting plates can pass through the at least two seventh through holes correspondingly, and the at least two connecting ribs can pass through the at least two eighth through holes correspondingly. [Effects of the Invention]

[0016] In a possible embodiment, the electronic device includes a first analog-to-digital converter connected to the plurality of first reference microphones, a second analog-to-digital converter connected to the plurality of error microphones, a core processor module connected to the first analog-to-digital converter and the second analog-to-digital converter, and a digital-to-analog converter connected to the core processor module, the core processor module including a processor and a memory, wherein an application program is stored in the memory, and the processor executes the application program to control the plurality of first reference microphones to collect a first sound in the internal space and obtain a first analog audio signal, control the first analog-to-digital converter to convert the first analog audio signal into a first digital audio signal, control the plurality of error microphones to collect a second sound in the internal space and obtain a second analog audio signal, control the second analog-to-digital converter to convert the second analog audio signal into a second digital audio signal, and perform active noise attenuation on the first digital audio signal and the second digital audio signal. the digital-to-analog converter to convert the digital output signal into the analog output signal; and driving the speaker to broadcast the anti-noise sound into the interior space based on the analog output signal.

[0017] In another embodiment, the electronic device includes a first analog-to-digital converter connected to the plurality of first reference microphones, a second analog-to-digital converter connected to the plurality of error microphones, a third analog-to-digital converter connected to the plurality of second reference microphones, a core processor module connected to the first analog-to-digital converter, the second analog-to-digital converter, and the third analog-to-digital converter, and a digital-to-analog converter connected to the core processor module, the core processor module including a processor and a memory, an application program is stored in the memory, and the processor controls the plurality of first reference microphones to collect the first sound in the internal space and obtain the first analog audio signal as the application program is executed; controlling the first analog-to-digital converter to convert the first analog audio signal into the first digital audio signal; controlling the plurality of error microphones to collect the second sound in the interior space to obtain the second analog audio signal; controlling the second analog-to-digital converter to convert the second analog audio signal into the second digital audio signal; controlling the plurality of second reference microphones to collect the third sound in the interior space to obtain a third analog audio signal; controlling the third analog-to-digital converter to convert the third analog audio signal into a third digital audio signal; performing the active noise attenuating processing on the first digital audio signal, the second digital audio signal, and the third digital audio signal to generate the digital output signal; controlling the digital-to-analog converter to convert the digital output signal into the analog output signal; and driving the speaker to broadcast the anti-noise sound into the interior space based on the analog output signal. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view of a conventional range hood. [Figure 2A] 1 is a first perspective view of a range hood with active noise reduction function according to the present invention; [Figure 2B] FIG. 2 is a second perspective view of the range hood with active noise reduction of the present invention. [Figure 3] FIG. 2 is a first perspective view of the hood body and the chimney. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 1 is a first block diagram of an electronic device. [Figure 7] FIG. 2 is a functional block diagram of an active noise cancellation module. [Figure 8] FIG. 3 is a third perspective view of the range hood with active noise reduction function of the present invention. [Figure 9] FIG. 2 is a second perspective view of the hood body and the chimney. [Figure 10] FIG. 2 is a perspective view of a sound-absorbing material and a sound-absorbing mat. [Figure 11] FIG. 2 is a side view of the sound-absorbing material and the sound-absorbing mat. [Figure 12] FIG. 2 is a second block diagram of the electronic device. [Figure 13] FIG. 2 is a functional block diagram of an active noise cancellation module. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to more clearly describe the range hood with active noise reduction function proposed by the present invention, the preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] 2A and 2B are first and second perspective views, respectively, of a range hood with active noise cancellation according to the present invention. As shown in FIGS. 2A and 2B, the range hood 1 with active noise cancellation according to the present invention comprises a hood body 11, a chimney 12, a fan motor 13, sound-absorbing material 14, and an active noise cancellation system, which comprises a plurality of first reference microphones 15, a plurality of error microphones 16, at least one speaker 17, and an electronic device 18.

[0021] FIG. 3 is a first perspective view of the hood body 11 and the chimney 12, FIG. 4 is a perspective view of the sound-absorbing material 14, and FIG. 5 is a side view of the sound-absorbing material 14. As shown in FIGS. 2A, 2B, 3, 4, and 5, the hood body 11 has a top opening 111, and the chimney 12 is connected to the top opening 111 through its first opening (i.e., bottom opening). The fan motor 13 is installed in the chimney 12 and has a first installation position. Anyone with experience in the field should know that one port of an exhaust pipe is connected to the exhaust port of the fan motor 13 through a second opening of the chimney 12, and the other port of the exhaust pipe is installed outdoors. More specifically, the sound-absorbing material 14 is cut using sound-absorbing foam and includes a first sound-absorbing part 141 and a second sound-absorbing part 142, with the first sound-absorbing part 141 attached to the inner wall of the chimney 12 and the second sound-absorbing part 142 attached to the inner surface of the hood body 11.

[0022] According to the design of the present invention, each of the first reference microphones 15 has a second installation position, and its head is exposed to the interior space of the chimney 12 as it passes through the first sound-absorbing part 141. Meanwhile, each of the error microphones 16 has a third installation position, and its head is exposed to the interior space as it passes through the first sound-absorbing part 141. Meanwhile, the at least one speaker 17 has an installation position, and is installed so that its cone surround ring passes through the first sound-absorbing part 141 and is exposed to the interior space, so that its sound-generating part (i.e., diaphragm assembly) faces the interior space. To further explain, according to the design of the present invention, the first installation position is higher than the second installation position, and the second installation position is higher than the third installation position, and this installation position is located between the second and third installation positions.

[0023] 6 is a first block diagram of the electronic device 18. As shown in FIGS. 2A, 2B, 5 and 6, the electronic device 18 is connected to the plurality of first reference microphones 15, the plurality of error microphones 16 and the at least one speaker 17, and includes a first analog-to-digital converter 181, a second analog-to-digital converter 182, a core processor module 180 and a digital-to-analog converter 183. According to the design of the present invention, the first analog-to-digital converter 181 is connected to the plurality of first reference microphones 15, the second analog-to-digital converter 182 is connected to the plurality of error microphones 16, the digital-to-analog converter 183 is connected to the core processor module 180, and the core processor module 180 is connected to the first analog-to-digital converter 181 and the second analog-to-digital converter 182.Furthermore, the core processor module 180 includes a processor 180P and a memory 180M in which an application program is stored, so that the processor 180P can execute the application program, thereby controlling the plurality of first reference microphones 15 to collect a first sound in the internal space of the chimney 12 and obtain a first analog audio signal, controlling the first analog-to-digital converter 181 to convert the first analog audio signal into a first digital audio signal, controlling the plurality of error microphones 16 to collect a second sound in the internal space and obtain a second analog audio signal, controlling the second analog-to-digital converter 182 to convert the second analog audio signal into a second digital audio signal, performing active noise attenuation processing on the first digital audio signal and the second digital audio signal to generate digital output signals, controlling the digital-to-analog converter 183 to convert the digital output signal into an analog output signal, and outputting anti-noise sound from the speaker 17 based on the analog output signal. and driving a signal (sound) to broadcast into the interior space.

[0024] It should be understood that aerodynamic noise may be generated during operation of the fan motor 13, and the sound-absorbing material 14 is used to block or destroy the aerodynamic noise, thereby achieving passive noise reduction. At the same time, the active noise reduction system is configured to collect residual noise within the chimney 12 during operation of the fan motor 13, generate an anti-noise signal through calculation, and then broadcast the anti-noise sound from the at least one speaker 17 into the chimney 12 based on the anti-noise signal, thereby achieving active noise reduction. To improve the noise reduction effect, the present invention specially designs the installation positions and the first to third installation positions. Specifically, a first distance is defined between the first installation position and the top opening 111 of the hood body 11, a second distance is defined between the second installation position and the top opening 111, and a third distance is defined between the third installation position and the top opening 111. Furthermore, the present invention is also designed so that the ratio of the second distance to the third distance is in the range of 3 to 5, and may be, for example, 4. In addition, the present invention is also designed so that there is a distance between the installation position and the top opening 111 of the hood body 11, and the ratio of the distance to the third distance is in the range of 2 to 4, and may be, for example, 3.

[0025] Meanwhile, FIG. 7 is a functional block diagram of an active noise cancellation module. In one embodiment, the application program stored in the memory 180M may include a control module (i.e., a subprogram module) that communicates and controls the individual electronic assembly units for arranging the processor 180P, as well as an active noise cancellation subprogram module. As shown in FIG. 7, the active noise cancellation subprogram module mainly includes a transfer function unit 180S, an adaptive filter 180F, and an adaptive calculator 180A. More specifically, the processed first digital audio signal is input to the transfer function unit 180S and the adaptive filter 180F as a first reference signal x(n). In practice, an active noise cancellation system includes an electronic delay, so the transfer function unit 180S is designed to perform electronic delay compensation on the first reference signal x(n), and the transfer function unit 180S may be, but is not limited to, a finite impulse response filter (FIR filter) or an infinite impulse response filter (IIR filter).

[0026] It should be understood that the adaptive filter 180F filters the first reference signal x(n) and generates the digital output signal y(n). Meanwhile, the second digital audio signal is input to the adaptive calculator 180A as an error signal e(n), and the adaptive calculator 180A simultaneously receives the second reference signal x'(n) output from the transfer function unit 180S. In practice, the adaptive calculator 180A may include an algorithm, such as a least mean square (LMS) algorithm, a normalized least mean square (NLMS) algorithm, or any other suitable algorithm. When performing such active noise attenuation processing, the adaptive calculator 180A self-adaptively adjusts at least one filter parameter of the adaptive filter 180F based on the second reference signal x'(n) and the error signal e(n), thereby making the error signal e(n) approach zero. As a result, the anti-noise audio converted from the digital output signal y(n) can cause the maximum level of destructive interference with the noise generated when the fan motor 13 is operating, thereby achieving a certain degree of active noise cancellation.

[0027] To further explain, the chimney 12 is provided with a plurality of first through holes 121, a plurality of second through holes 122, and at least one third through hole 123, so that the plurality of first reference microphones 15 can be correspondingly positioned in the plurality of first through holes 121, the plurality of error microphones 16 can be correspondingly positioned in the plurality of second through holes 122, and the speaker 17 can be correspondingly positioned in the third through hole 123. Correspondingly, the first sound-absorbing part 141 is provided with a plurality of fourth through holes 1411, a plurality of fifth through holes 1412, and at least one sixth through hole 1413, so that the plurality of first reference microphones 15 can be correspondingly positioned in the plurality of fourth through holes 1411, the plurality of error microphones 16 can be correspondingly positioned in the plurality of fifth through holes 1412, and the speaker 17 can be correspondingly positioned in the sixth through hole 1413. More specifically, a mounting frame including at least two connecting plates 120 is provided on the inner wall of the chimney 12, so that the fan motor 13 can be installed in the chimney 12 through the mounting frame. Correspondingly, the first sound absorbing part 141 is also provided with at least two seventh through holes 1415, so that the at least two connecting plates 120 can pass through the at least two seventh through holes 1415 correspondingly.

[0028] Figure 8 is a third perspective view of the range hood with active noise cancellation of the present invention. As shown in Figure 8, in the second embodiment, the range hood 1 with active noise cancellation of the present invention comprises a hood body 11, a chimney 12, a fan motor 13, a sound-absorbing material 14, a sound-absorbing mat 19, and an active noise cancellation system, which comprises a plurality of first reference microphones 15, a plurality of error microphones 16, at least one speaker 17, and an electronic device 18.

[0029] Fig. 9 is a second perspective view of the hood body 11 and the chimney 12, Fig. 10 is a perspective view of the sound-absorbing material 14 and the sound-absorbing mat 19, and Fig. 11 is a side view of the sound-absorbing material 14 and the sound-absorbing mat 19. As shown in Figs. 8, 9, 10 and 11, the hood body 11 has a top opening 111, and the chimney 12 is connected to the top opening 111 through its first opening (i.e., bottom opening). Furthermore, the fan motor 13 is installed in the chimney 12 and has a first installation position. In practice, the sound-absorbing material 14 and the sound-absorbing mat 19 can be formed by processing sound-absorbing foam, and the sound-absorbing material 14 is designed to include a first sound-absorbing part 141 and a second sound-absorbing part 142, so that the first sound-absorbing part 141 is attached to the inner wall of the chimney 12 and the second sound-absorbing part 142 is attached to the inner surface of the hood body 11 at the same time.

[0030] 8, 10 and 11, each of the first reference microphones 15 has a second installation position, and its head is exposed to the internal space of the chimney 12 after passing through the first sound-absorbing part 141. Meanwhile, each of the error microphones 16 has a third installation position, and its head is exposed to the internal space after passing through the first sound-absorbing part 141. Meanwhile, the sound-absorbing mat 19 is installed vertically in the chimney 12, and the second reference microphones 10 are installed on the sound-absorbing mat 19 and face the fan motor 13. According to the design of the present invention, each of the second reference microphones 10 is connected to the electronic device 18 and has a fourth installation position.

[0031] More specifically, the at least one speaker 17 has an installation position and is installed so that its surround ring of cone passes through the first sound-absorbing part 141 and is exposed to the interior space, so that its sound generating part (i.e., diaphragm assembly) faces the interior space. According to the design of the present invention, the first installation position is higher than the second installation position, and the second installation position is higher than the third installation position, which is located between the second and third installation positions, and the fourth installation position is located between the first and second installation positions.

[0032] 12 is a second block diagram of the electronic device 18. As shown in FIGS. 8, 10, 11 and 12, the electronic device 18 is connected to the plurality of first reference microphones 15, the plurality of second reference microphones 10, the plurality of error microphones 16 and the at least one speaker 17, and includes a first analog-to-digital converter 181, a second analog-to-digital converter 182, a third analog-to-digital converter 184, a core processor module 180 and a digital-to-analog converter 183. According to the design of the present invention, the first analog-to-digital converter 181 is connected to the plurality of first reference microphones 15, the second analog-to-digital converter 182 is connected to the plurality of error microphones 16, the digital-to-analog converter 183 is connected to the core processor module 180, and the core processor module 180 is connected to the first analog-to-digital converter 181 and the second analog-to-digital converter 182. Furthermore, the third analog-to-digital converter 184 is connected to the plurality of second reference microphones 10 and the core processor module 180 .

[0033] According to the design of the present invention, the core processor module 180 includes a processor 180P and a memory 180M in which an application program is stored, so that the processor 180P can execute the application program, which controls the plurality of first reference microphones 15 to collect a first sound in the internal space to obtain a first analog audio signal, controls the first analog-to-digital converter 181 to convert the first analog audio signal into a first digital audio signal, controls the plurality of error microphones 16 to collect a second sound in the internal space to obtain a second analog audio signal, controls the second analog-to-digital converter 182 to convert the second analog audio signal into a second digital audio signal, controls the plurality of second reference microphones 10 to collect a third sound in the internal space to obtain a third analog audio signal, controls the third analog-to-digital converter 184 to convert the third analog audio signal into a third digital audio signal, and performs active noise attenuation on the first digital audio signal, the second digital audio signal, and the third digital audio signal. the digital-to-analog converter 183 to convert the digital output signal into the analog output signal; and driving the speaker 17 to broadcast the anti-noise sound into the interior space based on the analog output signal.

[0034] It should be understood that aerodynamic noise may be generated during operation of the fan motor 13, and that the sound-absorbing material 14 and the sound-absorbing mat 19 are used to block or destroy the sound waves of such aerodynamic noise, thereby realizing passive noise cancellation. At the same time, the active noise cancellation system is configured to collect residual noise within the chimney 12 during operation of the fan motor 13, generate an anti-noise signal through calculation, and then drive the at least one speaker 17 to broadcast the anti-noise sound into the chimney 12 based on the anti-noise signal, thereby realizing active noise cancellation. Furthermore, in order to improve the noise cancellation effect, the present invention specially designs this installation position and the first to fourth installation positions. Specifically, there is a first distance between the first installation position and the top opening 111 of the hood body 11, a second distance between the second installation position and the top opening 111, a third distance between the third installation position and the top opening 111, and a fourth distance between the fourth installation position and the top opening 111. Furthermore, the present invention is also designed so that the ratio of the second distance to the third distance is in the range of 3 to 5 (for example, it may be 4), and the ratio of the fourth distance to the second distance is in the range of 0.3 to 1.3 (for example, it may be 0.8). In addition, the present invention is also designed so that there is a distance between such an installation position and the top opening 111 of the hood body 11, and the ratio of the distance to the third distance is in the range of 2 to 4 (for example, it may be 3).

[0035] Meanwhile, Figure 13 is a functional block diagram of an active noise cancellation module. In one embodiment, the application program stored in the memory 180M may include a control module (i.e., a subprogram module) that communicates and controls the individual electronic assembly units that configure the processor 180P, as well as an active noise cancellation subprogram module. As shown in Figure 13, the active noise cancellation subprogram module mainly includes a transfer function unit 180S, an adaptive filter 180F, and an adaptive calculator 180A. More specifically, the processed first digital audio signal and the processed third digital audio signal are input to the transfer function unit 180S and the adaptive filter 180F as a first reference signal x(n). In practice, an active noise cancellation system includes an electronic delay, so the transfer function unit 180S is designed to perform electronic delay compensation on the first reference signal x(n), and the transfer function unit 180S may be, but is not limited to, a finite impulse response filter (FIR filter) or an infinite impulse response filter (IIR filter).

[0036] It should be understood that the adaptive filter 180F filters the first reference signal x(n) and generates the digital output signal y(n). Meanwhile, the second digital audio signal is input to the adaptive calculator 180A as an error signal e(n), and the adaptive calculator 180A simultaneously receives the second reference signal x'(n) output from the transfer function unit 180S. In practice, the adaptive calculator 180A may include an algorithm, such as a least mean square (LMS) algorithm, a normalized least mean square (NLMS) algorithm, or any other suitable algorithm. When performing such active noise attenuation processing, the adaptive calculator 180A self-adaptively adjusts at least one filter parameter of the adaptive filter 180F based on the second reference signal x'(n) and the error signal e(n), thereby making the error signal e(n) approach zero. As a result, the anti-noise audio converted from the digital output signal y(n) can cause the maximum level of destructive interference with the noise generated when the fan motor 13 is operating, thereby achieving a certain degree of active noise cancellation.

[0037] To further explain, the chimney 12 is provided with a plurality of first through holes 121, a plurality of second through holes 122, and at least one third through hole 123, so that the plurality of first reference microphones 15 can be correspondingly positioned in the plurality of first through holes 121, the plurality of error microphones 16 can be correspondingly positioned in the plurality of second through holes 122, and the speaker 17 can be correspondingly positioned in the third through hole 123. Correspondingly, the first sound-absorbing part 141 is provided with a plurality of fourth through holes 1411, a plurality of fifth through holes 1412, and at least one sixth through hole 1413, so that the plurality of first reference microphones 15 can be correspondingly positioned within the plurality of fourth through holes 1411, the plurality of error microphones 16 can be correspondingly positioned within the plurality of fifth through holes 1412, and the speaker 17 can be correspondingly positioned within the sixth through hole 1413.

[0038] More specifically, a mounting frame including at least two connecting plates 120 is provided on the inner wall of the chimney 12, so that the fan motor 13 can be installed inside the chimney 12 through the mounting frame. It is worth noting that a protruding edge 191 is provided on the outer surface of the sound-absorbing mat 19, and a support frame 12S is provided on the inner wall of the chimney 12. As shown in FIGS. 9, 10, and 11, the support frame 12S includes a support plate 12S1 with a through-hole and at least two connecting ribs 12S2. One connecting rib 12S2 connects the left side of the support plate 12S1 to the inner wall of the chimney 12, and the other connecting rib 12S2 connects the right side of the support plate 12S1 to the inner wall of the chimney 12. In this way, the sound-absorbing mat 19 passes through the through-hole, and the protruding edge 191 is supported by the support plate 12S1. Correspondingly, the first sound-absorbing part 141 also has at least two seventh through holes 1415 and at least two eighth through holes 1416, so that the at least two connecting plates 120 can pass through the at least two seventh through holes 1415 correspondingly, and the at least two connecting ribs 12S2 can pass through the at least two eighth through holes 1416 correspondingly.

[0039] The above description has clearly and satisfactorily introduced the range hood with active noise reduction function and its operating method according to the present invention. However, it should be emphasized that what has been disclosed in the above application is merely a preferred embodiment, and that some changes or modifications based on the technical concept of the present application would be easily surmised by a person skilled in the art, provided that they do not deviate from the scope of the patent right of the present application. [Explanation of symbols]

[0040] 1a: Range hood 11a: Hood body 12a: Chimney 13a: Fan motor 1: Range hood with active noise reduction function 11: Hooded body 111:Top opening 12: Chimney 120: Connecting plate 121: First through hole 122: Second through hole 123: Third through hole 12S: Support frame 12S1: Support plate 12S2: Connecting rib 13: Fan motor 14: Sound absorbing material 141: First sound-absorbing part 1411: 4th through hole 1412: 5th through hole 1413: 6th through hole 1415: 7th Through Hole 1416: 8th Through Hole 142: Second sound-absorbing part 15: First reference microphone 16: Error microphone 17: Speaker 18:Electronic equipment 180: Core processor module 180P: Processor 180M:Memory 180S: Transfer function unit 180F: Adaptive filter 180A: Adaptive calculator 181: First analog-to-digital converter 182: Second analog-to-digital converter 183: Digital-to-analog converter 184: Third analog-to-digital converter 19: Sound-absorbing mat 191: Edge 10: Second reference microphone

Claims

1. A range hood with an active noise reduction function includes a hood body having a top opening, a chimney connected to the top opening through a first opening of the chimney, a fan motor installed in the chimney and having a first installation position, a sound absorbing material including a first sound absorbing part and a second sound absorbing part, a plurality of first reference microphones, a plurality of error microphones, at least one speaker, and an electronic device connected to the plurality of first reference microphones, the plurality of error microphones, and the at least one speaker, The first sound-absorbing part is attached to the inner wall of the chimney, and the second sound-absorbing part is attached to the inner surface of the hood body, each of the first reference microphones has a second installation position, and a head thereof is exposed to an internal space of the chimney as it passes through the first sound-absorbing part; Each of the error microphones has a third installation position, and a head thereof is exposed to the internal space as it passes through the first sound-absorbing part; the at least one speaker has an installation position and is installed so as to be exposed to the interior space through a surround ring of its cone and passing through the first sound-absorbing part, so that its sound generating portion can face the interior space; the first installation position is higher than the second installation position, the second installation position is higher than the third installation position, and the installation position is interposed between the second installation position and the third installation position; The electronic device is controlling the plurality of first reference microphones to collect a first sound in the internal space and acquire a first analog audio signal; controlling the plurality of error microphones to collect a second sound in the internal space and acquire a second analog audio signal; converting the first analog audio signal and the second analog audio signal into a first digital audio signal and a second digital audio signal; generating a digital output signal according to performing active noise attenuating processing on the first digital audio signal and the second digital audio signal; converting the digital output signal to an analog output signal; and driving the speaker to broadcast an anti-noise sound into the interior space based on the analog output signal.

2. 2. The range hood with active noise reduction function as described in claim 1, further comprising: a sound-absorbing mat installed vertically in the chimney; and a plurality of second reference microphones installed on the sound-absorbing mat and facing the fan motor, each of the second reference microphones being connected to the electronic device and having a fourth installation position, the fourth installation position being interposed between the first installation position and the second installation position.

3. 3. The range hood with active noise reduction function as described in claim 2, characterized in that there is a first distance between the first installation position and the top opening of the hood body, a second distance between the second installation position and the top opening, a third distance between the third installation position and the top opening, and a fourth distance between the fourth installation position and the top opening.

4. 4. A range hood with active noise reduction function as described in claim 3, characterized in that the ratio of the second distance to the third distance is in the range of 3 to 5, and the ratio of the fourth distance to the second distance is in the range of 0.3 to 1.

3.

5. A range hood with active noise reduction function as described in claim 3, characterized in that there is a distance between the installation position and the top opening of the hood body, and the ratio of the distance to the third distance is in the range of 2 to 4.

6. 3. The range hood with active noise reduction function according to claim 2, wherein the chimney is provided with a plurality of first through holes, a plurality of second through holes, and at least one third through hole, so that the plurality of first reference microphones can be positioned correspondingly in the plurality of first through holes, the plurality of error microphones can be positioned correspondingly in the plurality of second through holes, and the speaker can be positioned correspondingly in the third through hole.

7. 7. The range hood with active noise reduction function according to claim 6, wherein a mounting frame is provided on the inner wall of the chimney, so that the fan motor can be installed in the chimney through the mounting frame.

8. A range hood with active noise reduction function as described in claim 7, characterized in that a protruding edge is provided on the outer surface of the sound-absorbing mat, and a support frame is provided on the inner wall of the chimney, the support frame includes a support plate with a through hole and at least two connecting ribs, connecting the left side of the support plate to the inner wall of the chimney via one connecting rib and connecting the right side of the support plate to the inner wall of the chimney via another connecting rib, and the sound-absorbing mat passes through the through hole and its protruding edge is supported by the support plate.

9. 9. The range hood with active noise reduction function as described in claim 8, characterized in that the first sound-absorbing part is provided with a plurality of fourth through holes, a plurality of fifth through holes, and at least one sixth through hole, so that the plurality of first reference microphones can be correspondingly positioned in the plurality of fourth through holes, the plurality of error microphones can be correspondingly positioned in the plurality of fifth through holes, and the speaker can be correspondingly positioned in the sixth through hole.

10. 10. The range hood with active noise reduction function as described in claim 9, characterized in that the mounting frame includes at least two connecting plates, and the first sound-absorbing part also has at least two seventh through holes and at least two eighth through holes, so that the at least two connecting plates can pass through the at least two seventh through holes correspondingly, and the at least two connecting ribs can pass through the at least two eighth through holes correspondingly.

11. The electronic device includes a first analog-to-digital converter connected to the plurality of first reference microphones, a second analog-to-digital converter connected to the plurality of error microphones, a core processor module connected to the first analog-to-digital converter and the second analog-to-digital converter, and a digital-to-analog converter connected to the core processor module, the core processor module including a processor and a memory in which an application program is stored, and as the processor executes the application program: controlling the plurality of first reference microphones to collect the first sound in the internal space and acquire the first analog audio signal; controlling the first analog-to-digital converter to convert the first analog audio signal into the first digital audio signal; controlling the plurality of error microphones to collect the second sound in the internal space and acquire the second analog audio signal; controlling the second analog-to-digital converter to convert the second analog audio signal into the second digital audio signal; generating the digital output signal according to performing the active noise attenuating processing on the first digital audio signal and the second digital audio signal; controlling the digital-to-analog converter to convert the digital output signal to the analog output signal; and driving the speaker to broadcast the anti-noise sound into the interior space based on the analog output signal.

12. the electronic device includes a first analog-to-digital converter connected to the plurality of first reference microphones, a second analog-to-digital converter connected to the plurality of error microphones, a third analog-to-digital converter connected to the plurality of second reference microphones, a core processor module connected to the first analog-to-digital converter, the second analog-to-digital converter, and the third analog-to-digital converter, and a digital-to-analog converter connected to the core processor module, the core processor module including a processor and a memory in which an application program is stored, and as the processor executes the application program, controlling the plurality of first reference microphones to collect the first sound in the internal space and acquire the first analog audio signal; controlling the first analog-to-digital converter to convert the first analog audio signal into the first digital audio signal; controlling the plurality of error microphones to collect the second sound in the internal space and acquire the second analog audio signal; controlling the second analog-to-digital converter to convert the second analog audio signal into the second digital audio signal; controlling the plurality of second reference microphones to collect a third sound in the internal space and acquire a third analog audio signal; controlling the third analog-to-digital converter to convert the third analog audio signal into a third digital audio signal; generating the digital output signal according to performing the active noise attenuating processing on the first digital audio signal, the second digital audio signal, and the third digital audio signal; controlling the digital-to-analog converter to convert the digital output signal to the analog output signal; and driving the speaker to broadcast the anti-noise sound into the interior space based on the analog output signal.

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