Range hood with active noise reduction function

Abstract

The invention mainly discloses a range hood with an active noise reduction function. The range hood comprises a hood body, a chimney, a fan, a sound absorption piece and an active noise reduction system, when the draught fan operates, pneumatic noise can be generated, the sound absorption piece is used for blocking or damaging sound waves of the pneumatic noise, and therefore passive noise reduction is achieved. According to the design of the invention, the active noise reduction system comprises a plurality of reference microphones, a plurality of error microphones, an electronic device and at least one loudspeaker, and is configured to collect sound in the chimney in the operation process of the fan so as to generate an anti-noise signal through calculation; and then the loudspeaker is driven to play an anti-noise sound into the chimney according to the anti-noise signal, so that active noise reduction is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood with an active noise reduction function. Background Art

[0002] As is known, a range hood is an indispensable and important device in a modern kitchen, which is used to exhaust the fumes generated during cooking to the outside. Figure 1 FIG. 1 is a three-dimensional diagram of a conventional range hood. Figure 1 As shown, the conventional range hood 1a mainly includes a hood body 11a, a chimney 12a, a fan motor 13a disposed in the chimney 12a, and a fan motor control device.

[0003] While cooking, the user operates a user interface on the hood to activate the fan control device to operate the fan 13a. This causes the fan 13a to collect cooking fumes through an opening at the top of the hood 11a and then exhaust the fumes outdoors through the chimney 12a. However, practical experience has shown that the operation of the fan 13a generates considerable aerodynamic noise, which can be unpleasant for the cook in the kitchen and for family members on the adjacent balcony or living room.

[0004] From the above description, it is clear that it is worth considering adding an active noise control (ANC) system to a conventional range hood 1a. This system would adaptively reduce the noise levels generated by the fan 13a at different operating speeds. With this in mind, the inventors of this application have diligently researched and developed a range hood with active noise reduction. Summary of 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, a sound-absorbing member, and an active noise reduction system. The fan generates aerodynamic noise when in operation, and the sound-absorbing member is used to block or disrupt the sound waves of the aerodynamic noise, thereby achieving passive noise reduction. According to the design of the present invention, the active noise reduction system includes multiple reference microphones, multiple error microphones, an electronic device, and at least one speaker. The system is configured to collect sound within the chimney during fan operation, thereby generating an anti-noise signal through calculation. The anti-noise signal then drives the speaker to play an anti-noise sound into the chimney, thereby achieving active noise reduction.

[0006] To achieve the above-mentioned object, the present invention proposes an embodiment of the range hood with active noise reduction function, which includes:

[0007] A cover body having a top opening;

[0008] a chimney having a first opening connected to the top opening;

[0009] a fan disposed in the chimney and having a first location;

[0010] a sound absorbing member comprising a first sound absorbing section and a second sound absorbing section, wherein the first sound absorbing section is attached to the inner wall of the chimney, and the second sound absorbing section is attached to the inner surface of the cover;

[0011] a plurality of first reference microphones, wherein each of the first reference microphones has a second installation position, and a head portion thereof passes through the first sound absorbing section to be exposed in an inner space of the chimney;

[0012] a plurality of error microphones, wherein each error microphone has a third installation position, and a head portion thereof passes through the first sound absorbing section and is exposed in the internal space;

[0013] At least one speaker, wherein the speaker has a setting position and is arranged so that a fold thereof passes through the first sound absorbing section and is exposed to the interior space, thereby making a sound-emitting portion thereof face the interior space; and

[0014] an electronic device coupled to the plurality of first reference microphones, the plurality of error microphones, and the at least one speaker;

[0015] The first setting position is higher than the second setting position, the second setting position is higher than the third setting position, and the setting position is between the second setting position and the third setting position;

[0016] The electronic device is configured to:

[0017] Controlling the plurality of first reference microphones to collect a first sound in the interior space to obtain a first analog audio signal;

[0018] controlling the plurality of error microphones to collect a second sound in the internal space to obtain a second analog audio signal;

[0019] Converting the first analog audio signal and the second analog audio signal into a first digital audio signal and a second digital audio signal respectively;

[0020] performing an active noise attenuation process on the first digital audio signal and the second digital audio signal to generate a digital output signal;

[0021] converting the digital output signal into an analog output signal; and

[0022] The speaker 17 is driven by the analog output signal to play an anti-noise sound into the internal space.

[0023] In a feasible embodiment, the range hood with active noise reduction function of the present invention may further include:

[0024] a sound-absorbing pad vertically disposed within the chimney; and

[0025] a plurality of second reference microphones, disposed on the sound-absorbing pad and facing the fan;

[0026] Each of the second reference microphones is coupled to the electronic device and has a fourth setting position;

[0027] The fourth setting position is between the first setting position and the second setting position.

[0028] In one embodiment, there is a first distance between the first setting position and the top opening of the cover body, a second distance between the second setting position and the top opening, a third distance between the third setting position and the top opening, and a fourth distance between the fourth setting position and the top opening.

[0029] In one embodiment, a ratio of the third distance to the second distance is between 3 and 5, and a ratio of the second distance to the fourth distance is between 0.3 and 1.3.

[0030] In one embodiment, there is a distance between the setting position and the top opening of the cover, and a ratio of the third distance to the distance is between 2 and 4.

[0031] In one embodiment, the chimney is provided with a plurality of first perforations, a plurality of second perforations and at least one third perforation, so that the plurality of first reference microphones are correspondingly located in the plurality of first perforations, the plurality of error microphones are correspondingly located in the plurality of second perforations, and the speaker is correspondingly located in the third perforation.

[0032] In one embodiment, a mounting bracket is provided on the inner wall of the chimney, so that the fan is disposed in the chimney through the mounting bracket.

[0033] In one embodiment, the outer surface of the sound absorbing pad is provided with a flange, and the inner wall of the chimney is provided with a support frame, the support frame comprising:

[0034] a support plate having a through hole; and

[0035] at least two connecting ribs;

[0036] Wherein, one of the connecting ribs is connected between the left side of the support plate and the inner wall of the chimney, and the other connecting rib is connected between the right side of the support plate and the inner wall of the chimney;

[0037] The sound-absorbing pad passes through the through hole, and the flange is supported by the support plate.

[0038] In one embodiment, the first sound absorbing section is provided with a plurality of fourth through-holes, a plurality of fifth through-holes, and at least one sixth through-hole, such that the plurality of first reference microphones are correspondingly located in the plurality of fourth through-holes, the plurality of error microphones are correspondingly located in the plurality of fifth through-holes, and the loudspeaker is correspondingly located in the sixth through-hole.

[0039] In one embodiment, the mounting frame includes at least two connecting plates, and the first sound absorbing section is further provided with at least two seventh through-holes and at least two eighth through-holes, such that the at least two connecting plates correspondingly pass through the at least two seventh through-holes, and the at least two connecting ribs correspondingly pass through the at least two eighth through-holes.

[0040] In one possible embodiment, the electronic device includes:

[0041] a first analog-to-digital converter coupled to the plurality of first reference microphones;

[0042] a second analog-to-digital converter coupled to the plurality of error reference microphones;

[0043] a core processing module coupled to the first analog-to-digital converter and the second analog-to-digital converter; and

[0044] a digital-to-analog converter coupled to the core processing module;

[0045] The core processing module includes a processor and a memory. The memory stores an application program, and the processor executes the application program and is configured to perform:

[0046] controlling the plurality of first reference microphones to collect the first sound in the interior space to obtain the first analog audio signal;

[0047] Controlling the first analog-to-digital converter to convert the first analog audio signal into the first digital audio signal;

[0048] controlling the plurality of error microphones to collect the second sound in the internal space to obtain the second analog audio signal;

[0049] Controlling the second analog-to-digital converter to convert the second analog audio signal into the second digital audio signal;

[0050] performing active noise attenuation processing on the first digital audio signal and the second digital audio signal to generate the digital output signal;

[0051] controlling the digital-to-analog converter to convert the digital output signal into the analog output signal; and

[0052] The speaker is driven according to the analog output signal to play the anti-noise sound into the interior space.

[0053] In another embodiment, the electronic device comprises:

[0054] a first analog-to-digital converter coupled to the plurality of first reference microphones;

[0055] a second analog-to-digital converter coupled to the plurality of error reference microphones;

[0056] a third analog-to-digital converter, coupled to the plurality of second reference microphones;

[0057] a core processing module coupled to the first analog-to-digital converter, the second analog-to-digital converter, and the third analog-to-digital converter; and

[0058] a digital-to-analog converter coupled to the core processing module;

[0059] The core processing module includes a processor and a memory. The memory stores an application program, and the processor executes the application program and is configured to perform:

[0060] controlling the plurality of first reference microphones to collect the first sound in the interior space to obtain the first analog audio signal;

[0061] Controlling the first analog-to-digital converter to convert the first analog audio signal into the first digital audio signal;

[0062] controlling the plurality of error microphones to collect the second sound in the internal space to obtain the second analog audio signal;

[0063] Controlling the second analog-to-digital converter to convert the second analog audio signal into the second digital audio signal;

[0064] controlling the plurality of second reference microphones to collect the third sound in the interior space to obtain a third analog audio signal;

[0065] controlling the third analog-to-digital converter to convert the third analog audio signal into a third digital audio signal;

[0066] performing the active noise attenuation process on the first digital audio signal, the second digital audio signal, and the third digital audio signal to generate the digital output signal;

[0067] controlling the digital-to-analog converter to convert the digital output signal into the analog output signal; and

[0068] The speaker is driven according to the analog output signal to play the anti-noise sound into the interior space. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A three-dimensional diagram of a conventional range hood;

[0070] Figure 2A This is a first perspective view of a range hood with active noise reduction function according to the present invention;

[0071] Figure 2B A second perspective view of the range hood with active noise reduction function according to the present invention;

[0072] Figure 3 is a first stereoscopic view of the hood and the chimney;

[0073] Figure 4 is a three-dimensional diagram of a sound absorbing member;

[0074] Figure 5 is a side view of the sound absorbing member;

[0075] Figure 6 is a first block diagram of an electronic device;

[0076] Figure 7 is a functional block diagram of an active noise reduction module;

[0077] Figure 8 is a third perspective view of the range hood with active noise reduction function of the present invention;

[0078] Figure 9 is a second perspective view of the hood and chimney;

[0079] Figure 10 It is a three-dimensional diagram of the sound absorbing member and the sound absorbing pad;

[0080] Figure 11 It is a side view of the sound absorbing member and the sound absorbing pad;

[0081] Figure 12A second block diagram of an electronic device; and

[0082] Figure 13 This is a functional block diagram of an active noise reduction module.

[0083]

Explanation of symbols

[0084] 1a: Range hood

[0085] 11a: hood body

[0086] 12a: Chimney

[0087] 13a: Fan

[0088] 1: Range hood with active noise reduction function

[0089] 11: hood

[0090] 111: Top opening

[0091] 12: Chimney

[0092] 120: Connecting plate

[0093] 121: First perforation

[0094] 122: Second piercing

[0095] 123: Third piercing

[0096] 12S: support frame

[0097] 12S1: Support plate

[0098] 12S2: Connecting rib

[0099] 13: Fan

[0100] 14: Sound-absorbing parts

[0101] 141: First sound absorption section

[0102] 1411: Fourth perforation

[0103] 1412: Fifth Perforation

[0104] 1413: Sixth Perforation

[0105] 1415: Seventh Perforation

[0106] 1416: The Eighth Perforation

[0107] 142: The second sound-absorbing section

[0108] 15: First Reference Microphone

[0109] 16: Error microphone

[0110] 17: Speaker

[0111] 18: Electronic devices

[0112] 180: Core processing module

[0113] 180P:Processor

[0114] 180M: Memory

[0115] 180S: Transfer Function Unit

[0116] 180F: Adaptive filter

[0117] 180A: Adaptive Calculator

[0118] 181: First analog-to-digital converter

[0119] 182: Second analog-to-digital converter

[0120] 183: Digital-to-Analog Converter

[0121] 184: Third analog-to-digital converter

[0122] 19: Sound-absorbing pad

[0123] 191: flange

[0124] 10: Second reference microphone DETAILED DESCRIPTION

[0125] In order to more clearly describe the range hood with active noise reduction function proposed by the present invention, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0126] First embodiment

[0127] Figure 2A 、 Figure 2B These are the first and second stereograms of a range hood with active noise reduction function according to the present invention. Figure 2A and Figure 2B As shown, the range hood 1 with active noise reduction function of the present invention includes: a hood body 11, a chimney 12, a fan motor 13, a sound absorbing member 14, and an active noise reduction system, wherein the active noise reduction system includes: a plurality of first reference microphones 15, a plurality of error microphones 16, at least one speaker 17, and an electronic device 18.

[0128] Figure 3 This is a first stereoscopic view of the cover 11 and the chimney 12. Figure 4 is a perspective view of the sound absorbing member 14, and Figure 514 is a side view of the sound absorbing member 14. Figure 2A 、 Figure 2B 、 Figure 3 、 Figure 4 ,and Figure 5 As shown, the cover body 11 has a top opening 111, and the chimney 12 is connected to the top opening 111 with a first opening 121 (i.e., bottom opening). In addition, the fan 13 is arranged in the chimney 12 and has a first setting position. It should be known that in practice, one pipe mouth of an exhaust pipe is connected to an exhaust port of the fan 13 through a second opening of the chimney 12, and the other pipe mouth of the exhaust pipe is set outdoors. In more detail, the sound absorbing member 14 is cut from sound absorbing foam and includes a first sound absorbing section 141 and a second sound absorbing section 142, wherein the first sound absorbing section 141 is attached to the inner wall of the chimney 12, and the second sound absorbing section 142 is attached to the inner surface of the cover body 11.

[0129] According to the design of the present invention, each first reference microphone 15 has a second location, with one of its heads passing through the first sound-absorbing section 141 and exposed within the interior space of the chimney 12. Conversely, each error microphone 16 has a third location, with one of its heads passing through the first sound-absorbing section 141 and exposed within the interior space. Furthermore, the at least one speaker 17 has a location and is positioned such that a surround ring (surround ring of cone) passes through the first sound-absorbing section 141 and is exposed within the interior space, thereby allowing a sound-emitting portion (i.e., the diaphragm assembly) of the speaker to face the interior space. It should be noted that according to the design of the present invention, the first location is higher than the second location, which is higher than the third location, and the first location is located between the second and third locations.

[0130] Further, Figure 6 FIG. 1 is a first block diagram of the electronic device 18. Figure 2A 、 Figure 2B 、 Figure 5 and Figure 6As shown, the electronic device 18 is coupled 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 processing 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 coupled to the plurality of first reference microphones 15, the second analog-to-digital converter 182 is coupled to the plurality of error reference microphones 16, the digital-to-analog converter 183 is coupled to the core processing module 180, and the core processing module 180 is coupled to the first analog-to-digital converter 181 and the second analog-to-digital converter 182. In addition, the core processing module 180 includes a processor 180P and a memory 180M storing an application, so that the processor 180P executes the application and is configured to perform (is configured to perform):

[0131] controlling the plurality of first reference microphones 15 to collect a first sound in the interior space of the chimney 12 to obtain a first analog audio signal;

[0132] Controlling the first analog-to-digital converter 181 to convert the first analog audio signal into a first digital audio signal;

[0133] controlling the plurality of error microphones 16 to collect a second sound in the internal space to obtain a second analog audio signal;

[0134] Controlling the second analog-to-digital converter 182 to convert the second analog audio signal into a second digital audio signal;

[0135] performing an active noise attenuation process on the first digital audio signal and the second digital audio signal to generate the digital output signal;

[0136] Controlling the digital-to-analog converter 183 to convert the digital output signal into the analog output signal; and

[0137] The speaker 17 is driven by the analog output signal to play an anti-noise sound into the interior space.

[0138] It should be understood that the fan 13 generates aerodynamic noise when in operation, and the sound-absorbing member 14 is used to block or disrupt the sound waves of the aerodynamic noise, thereby achieving passive noise reduction. Simultaneously, the active noise reduction system is configured to collect residual noise within the chimney 12 during the operation of the fan 13, thereby generating an anti-noise signal through calculation. Based on this anti-noise signal, the at least one speaker 17 is then driven to play the anti-noise sound into the chimney, thereby achieving active noise reduction. Furthermore, to enhance the noise reduction effect, the present invention specifically designs the aforementioned setting positions and the first to third setting positions. Specifically, the first setting position has a first distance from the top opening 111 of the housing 11, the second setting position has a second distance from the top opening 111, and the third setting position has a third distance from the top opening 111. Furthermore, the present invention also designs a ratio between the third distance and the second distance to be between 3 and 5, for example, 4. Furthermore, the present invention further designs that there is a distance between the setting position and the top opening 111 of the cover body 11 , and a ratio between the third distance and the distance is between 2 and 4, for example, 3.

[0139] on the other hand, Figure 7 1 is a functional block diagram of an active noise reduction module. In one embodiment, the application program stored in the memory 180M includes not only a control module (i.e., a subroutine module) for configuring the processor 180P to communicate and control various electronic components / units, but also an active noise reduction subroutine module. Figure 7 As shown, the active noise reduction subroutine module mainly includes a transfer function unit 180S, an adaptive filter 180F, and an adaptive calculator 180A. More specifically, the first digital audio signal is processed into a first reference signal x(n) for input into the transfer function unit 180S and the adaptive filter 180F. In practice, active noise reduction systems often include electronic delays, so the transfer function unit 180S is designed to perform electronic delay compensation on the reference signal x(n). The transfer function unit 180S can be, but is not limited to, a finite impulse response filter (FIR) or an infinite impulse response filter (IIR).

[0140] 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 as an error signal e(n) into the adaptive calculator 180A. The adaptive calculator 180A also receives a second reference signal x'(n) output by the transfer function unit 180S. In practice, the adaptive calculator 180A includes an algorithm, such as a Least Mean Square (LMS) algorithm, a Normalized Least Mean Square (NLMS) algorithm, or other suitable algorithms. When performing the active noise attenuating process, the adaptive algorithm 180A 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) to make the error signal e(n) approach zero. This allows the anti-noise sound converted from the digital output signal y(n) to cause maximum destructive interference with the noise generated by the fan 13 during operation, thereby achieving a certain degree of active noise reduction.

[0141] In addition, 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 first reference microphones 15 are correspondingly located within the first through-holes 121, the error microphones 16 are correspondingly located within the second through-holes 122, and the speaker 17 is correspondingly located within the third through-hole 123. Correspondingly, the first sound-absorbing section 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 first reference microphones 15 are correspondingly located within the fourth through-holes 1411, the error microphones 16 are correspondingly located within the fifth through-holes 1412, and the speaker 17 is correspondingly located within the sixth through-hole 1413. More specifically, the inner wall of the chimney 12 is provided with a mounting bracket comprising at least two connecting plates 120, so that the fan 13 is mounted within the chimney 12 via the mounting bracket. Correspondingly, the first sound absorbing section 141 further defines at least two seventh through holes 1415 , such that the at least two connecting plates 120 pass through the at least two seventh through holes 1415 , respectively.

[0142] Second embodiment

[0143] Figure 8 FIG3 is a third perspective view of the range hood with active noise reduction function of the present invention. Figure 8As shown in the second embodiment, the range hood 1 with active noise reduction function of the present invention includes: a hood body 11, a chimney 12, a fan motor 13, a sound absorbing member 14, a sound absorbing pad 19, and an active noise reduction system, wherein the active noise reduction system includes: a plurality of first reference microphones 15, a plurality of error microphones 16, at least one speaker 17, and an electronic device 18.

[0144] Figure 9 is a second stereoscopic view of the cover 11 and the chimney 12, Figure 10 is a three-dimensional diagram of the sound absorbing member 14 and the sound absorbing pad 19, and Figure 11 14 and the side view of the sound absorbing member 19. Figure 8 、 Figure 9 、 Figure 10 ,and Figure 11 As shown, the housing 11 has a top opening 111, and the chimney 12 is connected to the top opening 111 through a first opening 121 (i.e., a bottom opening). Furthermore, the fan 13 is disposed within the chimney 12 and has a first location. In practice, the sound-absorbing member 14 and the sound-absorbing pad 19 can be formed from sound-absorbing foam. The sound-absorbing member 14 is designed to include a first sound-absorbing section 141 and a second sound-absorbing section 142, such that the first sound-absorbing section 141 adheres to the inner wall of the chimney 12, while the second sound-absorbing section 142 adheres to the inner surface of the housing 11.

[0145] like Figure 8 、 Figure 10 and Figure 11 As shown, each first reference microphone 15 has a second location, with one end thereof passing through the first sound-absorbing section 141 and exposed within the interior space of the chimney 12. Conversely, each error microphone 16 has a third location, with one end thereof passing through the first sound-absorbing section 141 and exposed within the interior space. Meanwhile, the sound-absorbing pad 19 is vertically positioned within the chimney 12, and the plurality of second reference microphones 10 are positioned above the pad 19, facing the fan 13. According to the design of the present invention, each second reference microphone 10 is coupled to the electronic device 18 and has a fourth location.

[0146] More specifically, the at least one speaker 17 has a first location and is positioned such that a surround ring (cone) passes through the first sound-absorbing section 141 and is exposed within the interior space, thereby allowing a sound-emitting portion (i.e., the diaphragm assembly) of the speaker to face the interior space. According to the design of the present invention, the first location is higher than the second location, which is higher than the third location. The first location is located between the second and third locations, and the fourth location is located between the first and second locations.

[0147] Further, Figure 12 is a second block diagram of the electronic device 18. Figure 8 、 Figure 10 、 Figure 11 ,and Figure 12 As shown, the electronic device 18 is coupled 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 processing 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 coupled to the plurality of first reference microphones 15, the second analog-to-digital converter 182 is coupled to the plurality of error reference microphones 16, the digital-to-analog converter 183 is coupled to the core processing module 180, and the core processing module 180 is coupled 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 coupled to the plurality of second reference microphones 10 and the core processing module 180.

[0148] According to the design of the present invention, the core processing module 180 includes a processor 180P and a memory 180M storing an application program, so that the processor 180P executes the application program and is configured to perform:

[0149] controlling the plurality of first reference microphones 15 to collect a first sound in the internal space to obtain a first analog audio signal;

[0150] Controlling the first analog-to-digital converter 181 to convert the first analog audio signal into a first digital audio signal;

[0151] controlling the plurality of error microphones 16 to collect a second sound in the internal space to obtain a second analog audio signal;

[0152] Controlling the second analog-to-digital converter 182 to convert the second analog audio signal into a second digital audio signal;

[0153] controlling the plurality of second reference microphones 10 to collect a third sound in the internal space to obtain a third analog audio signal;

[0154] Controlling the third analog-to-digital converter 184 to convert the third analog audio signal into a third digital audio signal;

[0155] performing an active noise attenuation process on the first digital audio signal, the second digital audio signal, and the third digital audio signal to generate the digital output signal;

[0156] Controlling the digital-to-analog converter 183 to convert the digital output signal into the analog output signal; and

[0157] The speaker 17 is driven according to the analog output signal to play the anti-noise sound into the interior space.

[0158] It should be understood that the fan 13 generates aerodynamic noise when in operation, and the sound-absorbing member 14 and the sound-absorbing pad 19 are used to block or disrupt the sound waves of the aerodynamic noise, thereby achieving passive noise reduction. Simultaneously, the active noise reduction system is configured to collect residual noise within the chimney 12 during the operation of the fan 13, thereby generating an anti-noise signal through calculation. Based on this anti-noise signal, the at least one speaker 17 is then driven to play the anti-noise sound into the chimney, thereby achieving active noise reduction. Furthermore, to enhance the noise reduction effect, the present invention specifically designs the aforementioned setting positions and the first to fourth setting positions. Specifically, the first setting position is spaced a first distance from the top opening 111 of the housing 11, the second setting position is spaced a second distance from the top opening 111, the third setting position is spaced a third distance from the top opening 111, and the fourth setting position is spaced a fourth distance from the top opening 111. Furthermore, the present invention further designs a ratio between the third distance and the second distance to be between 3 and 5 (e.g., 4), and a ratio between the second distance and the fourth distance to be between 0.3 and 1.3 (e.g., 0.8). Furthermore, the present invention further designs a distance between the installation position and the top opening 111 of the cover body 11, and a ratio between the third distance and the distance to be between 2 and 4, e.g., 3.

[0159] on the other hand, Figure 13 1 is a functional block diagram of an active noise reduction module. In one embodiment, the application program stored in the memory 180M includes not only a control module (i.e., a subroutine module) for configuring the processor 180P to communicate and control various electronic components / units, but also an active noise reduction subroutine module. Figure 13As shown, the active noise reduction subroutine module mainly includes a transfer function unit 180S, an adaptive filter 180F, and an adaptive calculator 180A. More specifically, the first digital audio signal and the third digital audio signal are processed into a first reference signal x(n) for input into the transfer function unit 180S and the adaptive filter 180F. In practice, the active noise reduction system will include an electronic delay, so the transfer function unit 180S is designed to perform electronic delay compensation on the reference signal x(n). The transfer function unit 180S can be, but is not limited to, a finite impulse response filter (FIR filter) or an infinite impulse response filter (IIR filter).

[0160] 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 as an error signal e(n) into the adaptive calculator 180A. The adaptive calculator 180A also receives a second reference signal x'(n) output by the transfer function unit 180S. In practice, the adaptive calculator 180A includes an algorithm, such as a Least Mean Square (LMS) algorithm, a Normalized Least Mean Square (NLMS) algorithm, or other suitable algorithms. When performing the active noise attenuating process, the adaptive algorithm 180A 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) to make the error signal e(n) approach zero. This allows the anti-noise sound converted from the digital output signal y(n) to cause maximum destructive interference with the noise generated by the fan 13 during operation, thereby achieving a certain degree of active noise reduction.

[0161] It should be noted that 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, such that the plurality of first reference microphones 15 are correspondingly located within the plurality of first through-holes 121, the plurality of error microphones 16 are correspondingly located within the plurality of second through-holes 122, and the speaker 17 is correspondingly located within the third through-hole 123. Correspondingly, the first sound absorbing section 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, such that the plurality of first reference microphones 15 are correspondingly located within the plurality of fourth through-holes 1411, the plurality of error microphones 16 are correspondingly located within the plurality of fifth through-holes 1412, and the speaker 17 is correspondingly located within the sixth through-hole 1413.

[0162] In more detail, the inner wall of the chimney 12 is provided with a mounting frame comprising at least two connecting plates 120, so that the fan 13 is installed in the chimney 12 through the mounting frame. It is worth noting that the outer surface of the sound absorbing pad 19 is provided with a flange 191, and the inner wall of the chimney 12 is provided with a support frame 12S. Figure 9 、 Figure 10 and Figure 11 As shown, the support frame 12S includes a support plate 12S1 with a perforation and at least two connecting ribs 12S2. One connecting rib 12S2 is connected between the left side of the support plate 12S1 and the inner wall of the chimney 12, and the other connecting rib 12S2 is connected between the right side of the support plate 12S1 and the inner wall of the chimney 12. Thus, the sound-absorbing pad 19 passes through the perforation, and its flange 191 is supported by the support plate 12S1. Correspondingly, the first sound-absorbing section 1411 is also provided with at least two seventh perforations 1415 and at least two eighth perforations 1416, such that the at least two connecting plates 120 correspondingly pass through the at least two seventh perforations 1415, and the at least two connecting ribs 12S2 correspondingly pass through the at least two eighth perforations 1416.

[0163] The above description fully and clearly describes the range hood with active noise reduction and its operation according to the present invention. However, it must be emphasized that the above disclosure of this patent is a preferred embodiment. Any minor changes or modifications that are derived from the technical concept of this patent and are readily inferred by those skilled in the art are within the scope of this patent.

Claims

1. A range hood with active noise reduction function, characterized in that: include: A cover body having a top opening; a chimney having a first opening connected to the top opening; a fan disposed in the chimney and having a first location; a sound absorbing member comprising a first sound absorbing section and a second sound absorbing section, wherein the first sound absorbing section is attached to the inner wall of the chimney, and the second sound absorbing section is attached to the inner surface of the cover; a plurality of first reference microphones, wherein each of the first reference microphones has a second installation position, and a head portion thereof passes through the first sound absorbing section to be exposed in an inner space of the chimney; a plurality of error microphones, wherein each error microphone has a third installation position, and a head portion thereof passes through the first sound absorbing section and is exposed in the internal space; At least one speaker, wherein the at least one speaker has a setting position and is arranged so that a surround thereof passes through the first sound absorbing section and is exposed to the interior space, thereby making a sound-emitting portion thereof face the interior space; and an electronic device coupled to the plurality of first reference microphones, the plurality of error microphones, and the at least one speaker; The first setting position is higher than the second setting position, the second setting position is higher than the third setting position, and the setting position is between the second setting position and the third setting position; The electronic device is configured to perform: Controlling the plurality of first reference microphones to collect a first sound in the interior space to obtain a first analog audio signal; controlling the plurality of error microphones to collect a second sound in the internal space to obtain 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 respectively; Performing an active noise reduction process on the first digital audio signal and the second digital audio signal to generate a digital output signal; converting the digital output signal into an analog output signal; and The speaker is driven according to the analog output signal to play an anti-noise sound into the internal space.

2. The range hood with active noise reduction function according to claim 1, characterized in that: Also includes: a sound-absorbing pad vertically disposed within the chimney; as well as a plurality of second reference microphones, disposed on the sound-absorbing pad and facing the fan; Each of the second reference microphones is coupled to the electronic device and has a fourth setting position; The fourth setting position is between the first setting position and the second setting position.

3. The range hood with active noise reduction function according to claim 2, characterized in that: There is a first distance between the first setting position and the top opening of the cover body, a second distance between the second setting position and the top opening, a third distance between the third setting position and the top opening, and a fourth distance between the fourth setting position and the top opening.

4. The range hood with active noise reduction function according to claim 2, characterized in that: A ratio of the third distance to the second distance is between 3 and 5, and a ratio of the second distance to the fourth distance is between 0.3 and 1.

3.

5. The range hood with active noise reduction function according to claim 2, characterized in that: There is a distance between the setting position and the top opening of the cover body, and a ratio of the third distance to the distance is between 2 and 4.

6. The range hood with active noise reduction function according to claim 2, characterized in that: 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 are correspondingly located in the plurality of first through-holes, the plurality of error microphones are correspondingly located in the plurality of second through-holes, and the speaker is correspondingly located in the third through-hole.

7. The range hood with active noise reduction function according to claim 6, characterized in that: The inner wall of the chimney is provided with a mounting frame, so that the fan is arranged in the chimney through the mounting frame.

8. The range hood with active noise reduction function according to claim 7, characterized in that: The outer surface of the sound-absorbing pad is provided with a flange, and the inner wall of the chimney 12 is provided with a support frame, which includes: a support plate having a through hole; and at least two connecting ribs; Wherein, one of the connecting ribs is connected between the left side of the support plate and the inner wall of the chimney, and the other connecting rib is connected between the right side of the support plate and the inner wall of the chimney; The sound-absorbing pad passes through the through hole, and the flange is supported by the support plate.

9. The range hood with active noise reduction function according to claim 8, characterized in that: The first sound absorbing section is provided with a plurality of fourth through-holes, a plurality of fifth through-holes, and at least one sixth through-hole, such that the plurality of first reference microphones are correspondingly located in the plurality of fourth through-holes, the plurality of error microphones are correspondingly located in the plurality of fifth through-holes, and the loudspeaker is correspondingly located in the sixth through-hole.

10. The range hood with active noise reduction function according to claim 9, characterized in that: The mounting frame includes at least two connecting plates, and the first sound absorbing section is further provided with at least two seventh through-holes and at least two eighth through-holes, so that the at least two connecting plates pass through the at least two seventh through-holes correspondingly, and the at least two connecting ribs pass through the at least two eighth through-holes correspondingly.

11. The range hood with active noise reduction function according to claim 2, characterized in that: The electronic device comprises: a first analog-to-digital converter coupled to the plurality of first reference microphones; a second analog-to-digital converter coupled to the plurality of error reference microphones; a core processing module coupled to the first analog-to-digital converter and the second analog-to-digital converter; and a digital-to-analog converter coupled to the core processing module; The core processing module includes a processor and a memory. The memory stores an application program, and the processor executes the application program and is configured to perform: controlling the plurality of first reference microphones to collect the first sound in the interior space to obtain 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 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; performing the active noise reduction process on the first digital audio signal and the second 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 The speaker is driven according to the analog output signal to play the anti-noise sound into the interior space.

12. The range hood with active noise reduction function according to claim 2, characterized in that: The electronic device comprises: a first analog-to-digital converter coupled to the plurality of first reference microphones; a second analog-to-digital converter coupled to the plurality of error reference microphones; a third analog-to-digital converter, coupled to the plurality of second reference microphones; a core processing module coupled 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 coupled to the core processing module; The core processing module includes a processor and a memory. The memory stores an application program, and the processor executes the application program and is configured to perform: controlling the plurality of first reference microphones to collect the first sound in the interior space to obtain 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 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 reduction 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 The speaker is driven according to the analog output signal to play the anti-noise sound into the interior space.

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