Active Noise Control Apparatus Sharing Suppression Information
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Solution Overview
Problem
Conventional active noise control systems face challenges in enhancing suppression performance without increasing device complexity or size, especially when installed in multiple areas within the same moving body, such as a train or airplane.
Innovation Solution
The proposed noise control system shares suppression information among noise control apparatuses installed in different areas of the same moving body, allowing each apparatus to use common suppression information related to noise suppression, thereby enhancing suppression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference microphones are arranged in a wider area to improve suppression performance, then suppression performance is improved, but device complexity and size increase
Solution Approach 1:
The patent combines reference microphone signals from multiple noise control apparatuses into a single composite reference signal. Instead of each apparatus independently processing its own reference microphone signal, the system merges these signals to create a more accurate noise model that benefits all apparatuses, improving suppression performance without requiring each device to have multiple microphones
Solution Approach 2:
The patent creates a universal reference signal that can be used by all noise control apparatuses in the system. This composite reference signal serves multiple functions simultaneously - it provides noise information for suppression in each apparatus while being generated from the collective input of all apparatuses, eliminating the need for each device to independently acquire and process separate reference signals
2Measurement precision
If multiple reference microphones are arranged in a wider area to improve suppression performance, then suppression performance is improved, but device size increases
Solution Approach 1:
The patent merges reference signals from spatially distributed microphones into a unified composite signal that can be processed at a central location. This allows the system to benefit from wide-area noise sampling without requiring each individual noise control apparatus to physically accommodate multiple microphones, thus maintaining compact device size while achieving improved suppression performance
3Productivity
If suppression information is shared among noise control apparatuses, then suppression performance and processing speed are improved, but device complexity increases
Solution Approach 1:
The patent establishes a universal information sharing mechanism where suppression information (including composite reference signals and suppression results) is made available to all noise control apparatuses through a common interface. This universal approach allows each apparatus to quickly access and utilize suppression information from others without implementing complex peer-to-peer communication protocols, thereby improving processing speed while keeping individual device complexity manageable
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
This approach enhances suppression performance by allowing noise control apparatuses to leverage shared suppression information, improving accuracy and processing speed while avoiding device enlargement or complexity.
Implementation Method 1
A reference microphone 91 collects noise emitted from a noise source
Implementation Method 2
A cancellation speaker 92 reproduces a cancellation signal generated by a suppression signal generation device 90, and emits a cancellation sound that cancels out the noise
Implementation Method 3
an error microphone 93 collects and feeds back uncanceled noise
Data Source
AI summary
Provided is a noise control apparatus and the like capable of enhancing suppression performance as compared with a conventional noise control apparatus without enlarging or complicating each device in a case where noise control apparatuses are installed in respective areas such as seats in the same moving body such as a train or an airplane. The noise control apparatus performs active noise control. The noise control apparatus has suppression information that is related to noise suppression and is common to another noise control apparatus, which is disposed in the same moving body, corresponding to a reference microphone different from a reference microphone of the noise control apparatus, and suppresses noise using the common suppression information.