Active Noise Cancellation Headset Power-Adaptive ANC Profiles
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Solution Overview
Problem
Existing active noise reduction headsets for vehicles do not effectively adapt to varying noise levels outside the vehicle, leading to inefficient power consumption and reduced battery life when operating on battery power.
Innovation Solution
The headset switches between two active noise reduction profiles and adjusts amplifier voltage based on connection to an external power supply, optimizing noise cancellation for different noise environments and conserving battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headset operates with high-level active noise reduction continuously, then noise cancellation performance is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements dynamic switching between two active noise reduction profiles (first profile with higher performance when connected to vehicle power supply, second profile with lower power consumption when operating on battery). The system automatically adjusts the noise reduction level based on the power supply status, transitioning from a static to a dynamic operation mode that optimizes both performance and energy efficiency.
Solution Approach 2:
The patent changes the operational parameters of the active noise reduction circuit by switching between different gain levels and filter settings depending on whether the vehicle power supply is connected. When connected, the system uses the first profile with higher gain for optimal noise cancellation; when disconnected, it switches to the second profile with reduced gain to conserve battery power.
2Reliability
If the headset uses the first active noise reduction profile optimized for vehicle noise, then low frequency noise cancellation is improved, but power consumption increases
Solution Approach 1:
The patent applies different noise reduction profiles tailored to specific operating conditions: the first profile is optimized for vehicle interior noise characteristics (low frequency dominant) when connected to vehicle power, while the second profile is optimized for outdoor noise environments with reduced power consumption. This localized optimization ensures that the system uses the appropriate noise cancellation characteristics for each specific environment and power availability scenario.
3Reliability
If the headset operates on battery power with full active noise reduction, then noise cancellation is maintained, but battery life is reduced
Solution Approach 1:
When operating on battery power, the patent applies the second active noise reduction profile which provides partial noise cancellation functionality at a reduced gain level. This partial action approach maintains sufficient noise reduction for outdoor environments while significantly reducing power consumption compared to full-strength active noise reduction, thereby extending battery life by up to 25%.
Data Source
Figure 1
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AI summary
The invention provides an active noise reduction system 1 which may be self-contained within a headset 2 of the system 1, wherein circuitry 14 within the system 1 applies an active noise reduction profile 24 to a signal to the speakers in the headset 1, to provide active noise reduction to the user of the headset 2, the system 1 being arranged to both receive power from a power supply external to the system and from a battery 6 of the system and to automatically modify the active noise reduction applied, in dependence on whether or not the system 1 is connected to an external power supply.