Seat Noise Reduction Device Positioning for Reclined Attenuation
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Solution Overview
Problem
Conventional noise reduction devices installed in seats, such as those in aircraft, are ineffective when users recline as the microphone or speaker can be hidden by pillows, leading to incomplete noise attenuation.
Innovation Solution
A noise reduction device is integrated into a shell that envelops the seat, featuring a noise controller, control sound output component, and residual sound detector, positioned away from the seat's rear face to ensure accurate noise cancellation regardless of the user's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the microphone or speaker is disposed on the seat surface or inside the seat, then the noise reduction device can be integrated into the seat structure, but the microphone or speaker may be hidden by pillows when the user is in a recumbent state, leading to ineffective noise attenuation
Solution Approach 1:
The patent relocates the microphone and speaker from the horizontal plane (seat surface) to the vertical dimension (above the seat backrest), positioning them in a spatial zone that remains accessible regardless of the user's recline angle or pillow placement, thereby resolving the contradiction between integration and reliability
2Device complexity
If the microphone or speaker is disposed on the seat surface or inside the seat, then the device structure can be simplified, but accurate noise detection and cancellation cannot be achieved when the user reclines
Solution Approach 1:
The patent positions the microphone and speaker in the vertical space above the seat backrest rather than on the seat surface, creating a detection and emission zone that remains unobstructed by pillows during recline, thereby maintaining measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent introduces a reflective surface (such as the seat backrest or a dedicated reflector) that acts as an intermediary to direct sound waves from the microphone to the user's ears and from the speaker to the user, enabling accurate noise detection and cancellation even when the components are positioned away from the direct path to the ears
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively attenuates noise by housing the control sound output component and residual sound detector within the shell, maintaining noise reduction even when the user is in a reclined position, thereby improving passenger comfort.
Implementation Method 1
a control sound output component configured to output a control sound based on the control sound signal produced by the noise controller
Implementation Method 2
a residual sound detector configured to detect a residual sound produced by superposition of noise and the control sound outputted from the control sound output component
Implementation Method 3
a residual sound detector configured to detect a residual sound produced by superposition of noise and the control sound
Data Source
AI summary
A noise reduction device includes a noise controller, a control sound output component and a residual sound detector. The noise controller is configured to produce a control sound signal for canceling out noise. The control sound output component is configured to output a control sound based on the control sound signal produced by the noise controller. The residual sound detector is configured to detect a residual sound produced by superposition of noise and the control sound outputted from the control sound output component. The control sound output component and the residual sound detector are housed in the shell. The control sound output component and the residual sound detector are away from a rear face of the seat.