Adaptive Headset Noise Cancellation via Directional Feed Forward
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Solution Overview
Problem
Current active noise cancellation headsets are ineffective in reducing external noises from multiple directions and are hindered by wind noise, as they rely on fixed anti-noise parameters, leading to increased weight, size, and power consumption.
Innovation Solution
A headset design incorporating first and second sound receiving circuits, an adaptive circuit, and synthesis circuits that dynamically adjust feed forward audio signals based on the direction of arrival of sounds to cancel noise, with an optional wind noise feedback circuit to reduce wind noise intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed anti-noise parameter is used in the headset, then the structure is simple, but the external noises from multiple directions cannot be effectively reduced
Solution Approach 1:
The patent applies dynamics by transitioning from fixed anti-noise parameters to dynamic adaptive parameters. The adaptive circuit continuously adjusts the anti-noise parameters based on real-time sound signals received from multiple microphones, enabling the system to adapt to noises from different directions and improve noise reduction effectiveness while maintaining reasonable structural complexity.
Solution Approach 2:
The patent implements multi-functionality by using multiple microphones (at least two) to receive sound signals from different directions simultaneously. This allows the headset to handle various noise sources from different spatial positions, making the noise reduction system more universal and effective across different noise scenarios.
2Reliability
If multiple microphones are added to detect sounds from different directions, then the noise reduction effectiveness improves, but the weight and size of the headset increase
Solution Approach 1:
The patent applies local quality by strategically positioning microphones at specific locations on the headset (e.g., different sides or positions) to capture sounds from different directions. This localized placement optimizes noise detection capability while minimizing the overall weight increase compared to adding microphones throughout the entire headset structure.
3Reliability
If multiple microphones and error microphones are included in the headset, then the noise detection capability improves, but the power consumption increases
Solution Approach 1:
The adaptive circuit dynamically adjusts the processing and anti-noise parameter updates based on the actual noise environment. When noise levels are low or stable, the processing intensity can be reduced, thereby lowering power consumption while maintaining adequate noise detection capability. This dynamic adjustment resolves the contradiction between enhanced detection capability and energy efficiency.
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 headset effectively reduces external noise by dynamically adjusting audio signals to match the phase of incoming sounds, reducing noise cancellation errors and power consumption while maintaining a lightweight and compact design.
Implementation Method 1
The first sound receiving circuit is configured to: receive a first sound of a first position, and convert the first sound into a first sound signal
Implementation Method 2
The second sound receiving circuit is configured to: receive a second sound of a second position, and convert the second sound into a second sound signal
Implementation Method 3
a phase at which the first feed forward audio signal output by the adaptive circuit of this embodiment of the present disclosure reaches a portion that is of a first speaker circuit and that is close to a left ear is inverted to a phase at which the first sound reaches the portion
Implementation Method 4
The first synthesis circuit is configured to: mix a first input audio signal and the first feed forward audio signal, and output a first output audio signal
Implementation Method 5
The second synthesis circuit is configured to: mix a second input audio signal and the second feed forward audio signal, and output a second output audio signal
Data Source
AI summary
A headset includes a first sound receiving circuit, a second sound receiving circuit, an adaptive circuit, a first synthesis circuit, and a second synthesis circuit. The adaptive circuit is configured to: obtain a first direction of arrival and a second direction of arrival according to a first sound signal and a second sound signal; obtain a first conversion function and a second conversion function according to the first direction of arrival and the second direction of arrival; obtain a first feed forward audio signal according to the first conversion function and the first sound signal; and obtain a second feed forward audio signal according to the second conversion function and the second sound signal.