Cooker hood with function of active noise cancellation

1 . A cooker hood with function of active noise cancellation, comprising:

a hood body having a top opening;

a chimney connected to the top opening by a first opening thereof;

a fan motor, being disposed in the chimney, and being disposed to be at a first disposing height;

a sound-absorbing member, comprising a first sound-absorbing segment attached onto an inner wall of the chimney and a second sound-absorbing segment attached onto an inner surface of the hood body;

a plurality of first reference microphones, wherein each of the plurality of first reference microphones is disposed to be at a second disposing height and pass through the first sound-absorbing segment by a microphone head thereof, such that the microphone head of each of the plurality of first reference microphones stays in an internal space of the chimney;

a plurality of error microphones, wherein each of the plurality of error microphones is disposed to be at a third disposing height and pass through the first sound-absorbing segment by a microphone head thereof, such that the microphone head of each of the plurality of error microphones stays in the internal space;

at least one loudspeaker, wherein the at least one loudspeaker is disposed to be at a disposing height and pass through the first sound-absorbing segment by a surround ring thereof, thereby making a sound broadcasting portion of the at least one loudspeaker face the internal space; and

an electronic device, being coupled to the plurality of first reference microphones, the plurality of error microphones and the at least one loudspeaker;

wherein the first disposing height is higher than the second disposing height, the second disposing height is higher than the third disposing height, and the disposing height is higher than the third disposing height and lower the second disposing height;

wherein 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 microphones;

a core processor 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 processor module and the at least one loudspeaker;

wherein the core processor module comprises a processor and a memory storing an application program, and the processor executes the application program so as to:

obtain, by controlling the plurality of first reference microphones to collect a first sound in the internal space and enabling the first A/D converter to apply an analog-to-digital converting process to the first sound, a first analog signal;

obtain, by controlling the plurality of error microphones to collect a second sound in the internal space and enabling the second analog-to-digital converter to apply an analog-to-digital converting process to the second sound, a second analog signal;

generate, by applying an active noise attenuating process to the first digital signal and the second digital signal, a digital output signal; and

generate, by enabling the digital-to-analog converter to apply a digital-to-analog converting process to the digital output signal and driving the at least one loudspeaker, an analog output signal corresponding to the digital output signal to broadcast an anti-noise sound toward the internal space.

2 . The cooker hood of claim 1 , further comprising:

a sound-absorbing block, being vertically disposed in the internal space of the chimney; and

a plurality of second reference microphones, being disposed on a top of the sound-absorbing block so as to face the face motor;

wherein each of plurality of second reference microphones is coupled to the electronic device, and is disposed to be at a fourth disposing height;

wherein the fourth disposing height is higher than the second disposing height and lower than the first disposing height.

3 . The cooker hood of claim 2 , wherein the fan motor is disposed to be spaced a first distance apart from the top opening of the hood body, each of the plurality of first reference microphones is disposed to be spaced a second distance apart from the top opening, each of the plurality of error microphones is disposed to be spaced a third distance apart from the top opening, and each of the plurality of second reference microphones is disposed to be spaced a fourth distance apart from the top opening.

4 . The cooker hood of claim 3 , wherein a ratio of the third distance against the second distance is in a range between 3 and 5, and a ratio of the second distance against the fourth distance is in a range between 0.3 and 1.3.

5 . The cooker hood of claim 3 , wherein the at least one loudspeaker is disposed to be spaced a specific distance apart from the top opening of the hood body, and a ratio of the third distance against the specific distance is in a range between 2 and 4.

6 . The cooker hood of claim 2 , wherein the chimney is provided with a plurality of first orifices, a plurality of second orifices and at least one third orifice thereon, such that each of the plurality of first reference microphones passes through one corresponding first orifice, each of the plurality of error microphones passes through one corresponding second orifice, and the surround ring of the loudspeaker passes through the third orifice.

7 . The cooker hood of claim 6 , wherein a first mounting bracket is connected to the inner wall of the chimney, such that the fan motor is disposed in the internal space of the chimney through the first mounting bracket.

8 . The cooker hood of claim 7 , wherein the sound-absorbing block is provided with a peripheral flange thereon, the inner wall of the chimney is further disposed with a second mounting bracket, and the second mounting bracket comprises:

a plate having a perforation; and

at least two connecting ribs, being connected between a left side of the plate and the inner wall of the chimney, and being also connected between a right side of the plate and the inner wall of the chimney;

wherein the sound-absorbing block passes through the perforation of the plate, such that the peripheral flange is supported by a top surface of the plate.

9 . The cooker hood of claim 8 , wherein the first sound-absorbing segment is provided with a plurality of fourth orifices, a plurality of fifth orifices and at least one sixth orifice thereon, such that each of the plurality of first reference microphones passes through one corresponding fourth orifice, each of the plurality of error microphones passes through one corresponding fifth orifice, and the surround ring of the loudspeaker passes through the sixth orifice.

10 . The cooker hood of claim 9 , wherein the first mounting bracket comprises at least two mounting plates, and the first sound-absorbing segment is further provided with at least two seventh orifices and at least two eighth orifices thereon, such that each of the at least two mounting plates passes through one corresponding seventh orifice, and each of the at least two connecting ribs passes through one corresponding eighth orifice.

11 . The cooker hood of claim 2 , wherein the electronic device comprises:

a third analog-to-digital converter coupled to the plurality of second reference microphones and the core processor module;

wherein the core processor module is further configured to obtain a third digital signal from the plurality of second reference microphones and to apply the active noise attenuating process based on the first digital signal, the second digital signal, and the third digital signal.