Multi-Speaker Headset Cancellation With Full-Band Inverse-Phase Noise
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Solution Overview
Problem
Active noise cancellation in headsets is challenged by variable and irregular environmental noise, and varying degrees of noise leakage due to differences in headset fitting with human ears, which affect audio clarity.
Innovation Solution
A noise cancellation method utilizing a headset with multiple speakers and microphones, determining target noise cancellation parameters on a per-frame basis to generate full-band inverse phase noise, adjusting filter coefficients through gradient descent and adaptive methods to optimize noise cancellation across different users and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional noise cancellation methods are used with limited frequency band coverage, then the device complexity is reduced, but the noise cancellation effectiveness deteriorates
Solution Approach 1:
The patent applies universality by generating full-band inverse phase noise that can be used across multiple frequency bands simultaneously. The system creates a comprehensive noise cancellation signal that covers the entire audible spectrum, allowing the same noise cancellation channel to effectively cancel noise across low, mid, and high frequencies rather than requiring separate specialized channels for each frequency range.
Solution Approach 2:
The patent transitions from traditional single-band or limited-band noise cancellation to full-band noise cancellation by adding the frequency spectrum dimension. Instead of treating noise cancellation in isolated frequency segments, the system generates inverse phase noise that spans the complete frequency spectrum, effectively adding a dimensional aspect to the noise cancellation approach.
2Reliability
If full-band inverse phase noise is generated for each speaker, then the noise cancellation effectiveness is improved, but the computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the full-band noise cancellation task into separate processing streams for each speaker. Instead of attempting to generate and manage a single complex full-band signal, the system segments the noise cancellation into multiple independent full-band inverse phase noise streams, one for each speaker, which can be processed and managed separately before being combined.
Solution Approach 2:
The patent applies preliminary action by pre-generating the full-band inverse phase noise signals for each speaker before actual noise cancellation is needed. The system prepares comprehensive noise cancellation parameters and full-band inverse phase noise in advance, allowing for optimized computational processing during real-time operation rather than calculating everything from scratch during active noise cancellation.
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
Enhances noise cancellation effectiveness by utilizing full-band inverse phase noise, improving audio clarity and reducing noise leakage, while adapting to individual ear fit and environmental conditions.
Implementation Method 1
generating, based on the plurality of groups of target noise cancellation parameters, a plurality of groups of target inverse phase noise that are in a one-to-one correspondence with the plurality of first speakers
Implementation Method 2
performing noise cancellation through the plurality of first speakers by using the plurality of groups of target inverse phase noise
Data Source
AI summary
A noise cancellation method includes: determining a plurality of groups of target noise cancellation parameters that are in a one-to-one correspondence with a plurality of first speakers of a headset; generating, based on the plurality of groups of target noise cancellation parameters, a plurality of groups of target inverse phase noise that are in a one-to-one correspondence with the plurality of first speakers, where a frequency band of each target inverse phase noise in the plurality of groups of target inverse phase noise covers a sound-making frequency band of the plurality of first speakers; and performing noise cancellation through the plurality of first speakers by using the plurality of groups of target inverse phase noise.