Active Noise Control System Dynamic Anti-Noise Adjustment
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Solution Overview
Problem
Active noise control systems face inefficiencies in adjusting destructively interfering sound waves to optimize power distribution between noise cancellation and audio output, leading to unnecessary power consumption and reduced effectiveness in masking undesired sounds.
Innovation Solution
An active noise control system that adjusts anti-noise signals based on audio system output, including volume settings and frequency content, to optimize power allocation and reduce unnecessary noise generation, thereby enhancing the masking of undesired sounds and improving overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ANC system generates loud destructively-interfering sound waves to effectively mask undesired sound, then noise cancellation effectiveness is improved, but power consumption increases and audio output power is reduced
Solution Approach 1:
The patent implements dynamic adjustment of anti-noise signal amplitude based on real-time monitoring of audio output levels. The system continuously adapts the ANC signal strength to match current audio conditions, transitioning from static to dynamic operation. This allows the system to consume less power during low audio output while maintaining effective noise cancellation when needed.
Solution Approach 2:
The system changes the amplitude parameter of the destructively-interfering sound waves based on audio output conditions. When audio output is high, the anti-noise amplitude is reduced since the audio itself masks the undesired sound. When audio output is low, the anti-noise amplitude is increased to maintain effective noise cancellation. This parameter adaptation optimizes power consumption while maintaining effectiveness.
2Reliability
If the ANC system generates high-amplitude destructively-interfering sound waves, then noise cancellation effectiveness is improved, but power available for audio/video system is reduced
Solution Approach 1:
The system dynamically adjusts the power distribution between ANC and audio output based on real-time conditions. When audio output is high, the system automatically reduces ANC power consumption, freeing up power for audio quality. When audio output is low, the system increases ANC power allocation to maintain noise cancellation effectiveness. This dynamic power management resolves the trade-off between the two functions.
Solution Approach 2:
The system changes the amplitude parameter of anti-noise signals based on audio output levels, directly controlling power allocation. By reducing anti-noise amplitude when audio is playing at high levels, the system reallocates power from ANC to audio output, ensuring optimal power distribution between the two competing functions.
3Reliability
If the ANC system operates at full power continuously, then noise cancellation is maintained, but system efficiency is reduced due to unnecessary power consumption during high audio output
Solution Approach 1:
The system extracts and monitors the audio output signal to determine when it is sufficient for masking undesired sound. When the extracted audio signal exceeds a threshold, the system stops or reduces anti-noise generation, removing unnecessary power consumption. This selective operation maintains noise cancellation effectiveness while improving overall system efficiency by eliminating redundant operations.
Solution Approach 2:
Instead of continuous full-power operation, the system applies partial action by reducing anti-noise amplitude when audio output is sufficient. The system determines the minimum necessary anti-noise level based on audio conditions, applying only the required amount of noise cancellation rather than maximum power continuously, thereby improving efficiency while maintaining effectiveness.
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 system effectively reduces power consumption and enhances noise cancellation by dynamically adjusting anti-noise signals in response to audio system conditions, ensuring that power is allocated efficiently between noise cancellation and audio output, thereby improving the masking of undesired sounds.
Implementation Method 1
The speakers may be driven to generate sound waves to destructively interfere with undesired sound present in at least one targeted listening space
Implementation Method 2
At least one microphone may detect sound waves resulting from the combination of the generated sound waves and the undesired sound
Data Source
AI summary
An active noise control (ANC) system is configured to generate at least one anti-noise signal configured to drive a speaker to generate sound waves to destructively interfere with an undesired sound present in a target space. The at least one anti-noise signal is adjusted based an output signal of an audio system. The at least one anti-noise signal may be adjusted based on at least one of a volume level of the audio system, a power level of at least one predetermined frequency or frequency range of the output signal of the audio system, frequency content of an output signal of the audio system. The ANC system receives an error signal to adjust generation of the at least one anti-noise signal. The error signal is adjusted to compensate for adjustment of the at least one anti-noise signal based on the output signal of the audio system.