Noise reduction device
View Patent ↗A noise reduction device, including a microphone for detecting noise, a noise controller for reversing the phase of noise detected by the microphone based on information outputted from the microphone, and a speaker for outputting sound based on information outputted from the noise controller, is arranged at a seat surrounded by a shell portion having a cavity, wherein a speaker is disposed in the cavity of the shell portion.
1. A noise reduction device comprising:
a noise detecting unit detecting noise emitted from noise sources;
a noise control unit for generating a control sound signal to reduce noise detected by the noise detecting unit; and
a control sound output unit for outputting a control sound based on the control sound signal from the noise control unit, wherein
the noise reduction device is arranged at at least one of a plurality of seats;
each of the plurality seats includes a seat portion having a headrest and a shell portion surrounding the seat portion by its wall surface;
the shell portion includes a bulged section having a width in a direction that a passenger sits at the seat portion,
the bulged section is located behind the seat portion and has a cavity at a position opposed to the headrest of the seat portion;
the control sound output unit is installed in the cavity of the shell portion; and
the cavity is used for a sound space and integrated into the shell portion.
2. The noise reduction device of claim 1 ,
the noise reduction device comprising a plurality of noise detecting units,
wherein at least one of the plurality of noise detecting units is arranged at the shell portion.
3. The noise reduction device of claim 2 ,
the noise reduction device comprising a plurality of control sound output units,
wherein more than one control sound output unit are installed in the cavity.
4. The noise reduction device of claim 2 ,
wherein the shell portion includes a plurality of corner portions; and
each of the plurality of corner portions includes curved surface shape.
5. The noise reduction device of claim 4 ,
wherein the shell portion shape is egg-shaped.
6. The noise reduction device of claim 1 ,
wherein the control sound output unit is movably arranged in the cavity of the shell portion.
7. The noise reduction device of claim 1 ,
wherein the seat portion has a reclining portion, and the control sound output unit moves in the cavity of the shell portions, interlocking with the reclining portion.
8. The noise reduction device of claim 1 ,
wherein the seat portion has a reclining portion and the reclining portion is arranged at an angle of predetermined.
9. The noise reduction device of claim 1 ,
wherein the seat portion has a reclining portion and the bulged section is at a position opposite to the back of the reclining portion.