Noise Reduction Device Dynamic Microphone Switching
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Solution Overview
Problem
In closed structures like aircraft and railway vehicles, noise reduction devices face challenges due to adjustable seats and obstructing objects, which change the control point for noise reduction, affecting the functionality of microphones and speakers and reducing noise reduction effectiveness.
Innovation Solution
A noise reduction system comprising a processor-connected sound receiver and transmitter that dynamically adjusts the operation of microphones and speakers based on seat information and sound field changes, switching between noise and error microphones and speakers to optimize noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seat position is adjusted, then the control point for noise reduction changes, but the noise reduction effectiveness deteriorates because the microphone and speaker functions are obstructed
Solution Approach 1:
The system dynamically switches between different microphones and speakers based on the detected sound field state changes caused by seat position adjustments. This dynamic reconfiguration ensures that the noise reduction system maintains effectiveness despite changes in the acoustic environment, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The system continuously monitors the sound field state and uses this feedback to determine when to switch between different microphone and speaker configurations. This feedback mechanism ensures that the noise reduction system adapts to seat position changes while maintaining consistent performance, addressing both adaptability and reliability requirements.
2Adaptability or versatility
If multiple microphones and speakers are used to cover different seat positions, then the noise reduction coverage is improved, but the device complexity increases
Solution Approach 1:
The noise reduction system is divided into multiple independent microphone and speaker units, each optimized for specific positions. The system selectively activates only the necessary units based on the current sound field state, providing comprehensive coverage while avoiding the complexity of managing all units simultaneously.
Solution Approach 2:
Each microphone and speaker in the system is designed to serve multiple potential functions depending on the seat position and sound field state. This multi-functionality allows the system to achieve broad noise reduction coverage using a standardized set of components, reducing overall system complexity.
3Reliability
If all microphones and speakers operate continuously, then the noise reduction effectiveness is maintained, but the power consumption increases
Solution Approach 1:
Instead of continuous operation, the system periodically monitors the sound field state and activates microphones and speakers only when needed. This periodic action maintains noise reduction effectiveness while significantly reducing power consumption compared to continuous operation of all components.
Solution Approach 2:
The system deactivates (discards) microphones and speakers that are not currently needed for noise reduction, and activates (recovers) them only when the sound field state changes require their use. This approach maintains effectiveness by keeping components available when needed while minimizing power consumption by keeping them inactive otherwise.
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
Effectively maintains noise reduction even with changing seat positions and obstructions, reducing power consumption and enhancing noise cancellation by dynamically adjusting microphone and speaker operations.
Implementation Method 1
the processor detects a state change of the sound field based on sound signals received from a plurality of microphones
Implementation Method 2
the control sound transmitter outputs the control sound signal to a plurality of speakers
Implementation Method 3
generates a control sound signal for reducing noise with respect to the sound signal
Data Source
AI summary
A noise reduction device is connectable to a plurality of sound acquisition devices and a plurality of control sound output devices for reducing noises in a given space where seats are arranged and a sound field can be formed. The device includes a sound receiver, a processor, a control sound transmitter. The sound receiver receives a sound signal from at least two of the plurality of sound acquisition devices. The processor detects a state change of the sound field, and generates a control sound signal for reducing noise with respect to the sound signal. The control sound transmitter outputs the control sound signal to each of control sound output devices. The processor acquires, for example, seat information for specifying the reclining state of a seat. The processor controls the generation of the control sound signal based on the change of state of the sound field including the seat information.