Active Noise Control Headphones with Adaptive Filter
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Solution Overview
Problem
Current active noise control headphones fail to meet the diverse sound quality needs of consumers, often requiring increased volume to counter outdoor noise, which can lead to hearing damage, and struggle with uneven residual noise after noise control, causing discomfort.
Innovation Solution
An active noise control method and system that determines an expected noise control curve based on user needs, calculates a target filter using noise control weight values, reference noise weight values, and filter models, and performs noise control processing to reduce specific frequency noise, ensuring consistent residual noise energy across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the playback volume of headphones is increased to cover outdoor noise, then the music can be heard clearly, but hearing damage occurs
Solution Approach 1:
The patent converts the harmful outdoor noise into a beneficial element by using it as the target for active noise control. The system collects external noise signals, processes them through adaptive filters, and generates anti-phase noise signals that cancel the original noise, thereby protecting users from hearing damage while maintaining music quality.
Solution Approach 2:
The patent introduces an intermediary noise control system between the outdoor noise and the user's ear. This system includes noise collection devices, signal processing units, and noise output devices that work together to generate canceling noise signals, effectively mediating the interaction between external noise and human hearing.
2Object-affected harmful factors
If active noise control is applied to reduce outdoor noise, then hearing protection is provided, but different consumer needs for sound quality cannot be met
Solution Approach 1:
The patent implements dynamic adaptability by allowing users to adjust noise control parameters in real-time. The system includes user interface devices that enable consumers to modify filter coefficients, noise reduction levels, and frequency response characteristics according to their personal preferences and different usage scenarios, making the noise control system dynamically adaptable rather than static.
Solution Approach 2:
The patent enables parameter changes by allowing users to modify key parameters such as noise control weight values, filter frequency responses, and target noise reduction levels. These parameter adjustments enable the same hardware system to deliver different sound quality experiences tailored to individual consumer needs while maintaining effective noise control.
3Object-affected harmful factors
If traditional active noise control systems are used, then noise reduction is achieved, but uneven residual noise across frequencies causes discomfort
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors the noise control effect across different frequency bands and adjusts filter coefficients accordingly. By analyzing residual noise characteristics and comparing them against target curves, the system dynamically optimizes its performance to achieve uniform noise reduction across frequencies, eliminating the discomfort caused by uneven residual noise.
Solution Approach 2:
The patent applies local quality optimization by treating different frequency bands with customized filter parameters. Instead of using a uniform approach across all frequencies, the system designs frequency-specific filter coefficients and weight values that account for the unique characteristics of each frequency range, thereby achieving consistent noise control performance across the entire spectrum.
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 allows users to set their desired noise reduction levels, such as reducing noise below 300 Hz, and ensures consistent residual noise energy, enhancing sound quality and user comfort by tailoring noise control to individual preferences and scenarios.
Implementation Method 1
performing a spectrum analysis on the external noise signal to obtain an amplitude spectrum of the external noise signal
Implementation Method 2
invert the collected external noise signal and superimpose it with a played audio signal to achieve active noise control
Data Source
AI summary
Embodiments of the present application provide a method and system for active noise control, which can meet different needs of different consumers on sound quality of headphones. The method includes: determining an expected noise control curve of performing active noise control on a target object; determining a target filter according to the expected noise control curve and a filter model; and performing noise control processing on an external noise signal using the target filter.