ANC Headset Multi-Speaker Control for Low-Frequency Pop Noise
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Solution Overview
Problem
Existing noise cancellation headsets face challenges in improving noise cancellation effects, particularly in low-frequency and high-noise scenarios, where ambient noise can cause pop noise and reduce the effectiveness of active noise cancellation.
Innovation Solution
The headset incorporates multiple power drive circuits and speakers, along with an active noise cancellation module that generates phase-inverted noise signals to cancel ambient noise, and utilizes audio mixing and power amplification to enhance noise cancellation performance. This setup includes feed-forward and feedback modules to improve filtering fitting and frequency band-based noise cancellation, avoiding pop noise in low-frequency scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If active noise cancellation is used to reduce ambient noise, then noise cancellation effect is improved, but pop noise occurs in low-frequency and high-noise scenarios
Solution Approach 1:
The audio signal processing is segmented into multiple frequency bands using a multi-band filter. Each band is processed independently with tailored noise cancellation parameters, allowing low-frequency signals to be handled differently from high-frequency signals. This segmentation prevents the generation of pop noise while maintaining effective noise cancellation across all frequency ranges.
Solution Approach 2:
The system dynamically adjusts processing parameters based on signal characteristics. When low-frequency signals are detected, the gain and filtering parameters are modified to prevent distortion and pop noise. The adaptive parameter adjustment ensures optimal noise cancellation performance while avoiding the harmful side effect of pop noise in challenging acoustic environments.
2Power
If multiple power drive circuits and speakers are used to increase output energy, then noise cancellation performance is improved, but device complexity increases
Solution Approach 1:
Multiple speakers are merged into a unified noise cancellation system with coordinated control. The multiple power drive circuits work together to drive the speaker array, creating a synergistic effect that delivers high output energy. This merging approach achieves the desired power level while managing system complexity through integrated control architecture.
Solution Approach 2:
The multi-speaker system is designed to serve multiple functions: noise cancellation, audio playback, and adaptive gain control. By making the speaker system multi-functional, the patent justifies the increased complexity through enhanced versatility and performance across different operating scenarios.
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 solution significantly improves noise cancellation performance and robustness in low-frequency and high-noise environments, reducing the occurrence of pop noise and enhancing user experience by providing higher output energy and sensitivity.
Implementation Method 1
an audio signal whose amplitude is the same as that of the ambient noise and whose phase is opposite to that of the ambient noise is generated in an ear, to cancel the ambient noise
Implementation Method 2
The plurality of power drive circuits are configured to perform power amplification on the at least one mixed audio signal based on respective output powers
Implementation Method 3
The plurality of speakers are configured to play the at least one power-amplified mixed audio signal
Data Source
AI summary
A headset with the active noise cancellation (ANC) function includes an ANC module, a plurality of speakers, a plurality of power drive circuits, and at least one reference microphone. An output end of any one of the plurality of power drive circuits is connected to at least one of the plurality speakers. The ANC module is connected between at least one reference microphone and input ends of the plurality of power drive circuits. The at least one reference microphone is configured to collect at least one first ambient noise signal. The ANC module is configured to obtain at least one mixed audio signal. The plurality of power drive circuits are configured to perform power amplification on the at least one mixed audio signal based on respective output powers to obtain at least one power-amplified mixed audio signal.