Integrated PBE and ANC for Small-Speaker Bass Reproduction
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Solution Overview
Problem
Existing audio systems, particularly in earphones and handsets, face challenges in reproducing low-frequency sounds due to the limitations of small speakers, which affects the performance of active noise cancellation (ANC) and psychoacoustic bass enhancement (PBE) techniques, leading to suboptimal noise cancellation and bass reproduction.
Innovation Solution
Integration of an ANC module and a PBE module that work together to convert real bass content into virtual bass, offloading the physical burden on speakers and reducing distortion, with real-time tuning of parameters based on ANC and audio signal feedback to enhance overall audio performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ANC techniques are used with small speakers, then noise cancellation is attempted, but low-frequency response is inadequate leading to suboptimal performance
Solution Approach 1:
The patent introduces PBE as an intermediary system that generates virtual bass signals to compensate for the small speaker's inadequate low-frequency response. The PBE module processes mid-frequency audio signals and synthesizes corresponding bass frequencies, acting as a mediator between the audio source and the speaker to achieve reliable bass reproduction without requiring a larger speaker unit.
2Ease of operation
If PBE and ANC are combined, then perceived bass reproduction is improved, but the systems operate independently resulting in suboptimal overall performance
Solution Approach 1:
The patent merges the PBE and ANC systems into a unified integrated architecture where the PBE module receives audio signals, generates enhanced bass output, and feeds it to the ANC module. The ANC module then processes this combined signal along with noise reference signals. This merging allows the systems to work cooperatively rather than independently, optimizing overall performance while managing complexity through shared signal processing pathways.
Solution Approach 2:
The integrated system implements feedback mechanisms where the ANC module's processing of PBE output creates a coordinated control loop. The system uses feedback from the combined PBE-ANC processing to dynamically adjust signal generation and cancellation parameters, ensuring that bass enhancement and noise cancellation work synergistically rather than conflicting with each other.
3Manufacturing precision
If real bass content is reproduced by small speakers, then audio fidelity is maintained, but speaker distortion increases
Solution Approach 1:
The PBE module creates virtual copies of bass frequencies by processing mid-frequency audio signals and synthesizing corresponding low-frequency components. Instead of requiring the small speaker to physically reproduce low-frequency vibrations, the system generates mid-frequency signals that psychoacoustically evoke bass perception, and simultaneously generates corresponding bass signals that are processed by ANC. This copying approach maintains audio fidelity while avoiding the physical limitations and distortion issues of small speakers.
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
This integration improves the perceived low-frequency performance, reduces speaker distortion, and optimizes ANC and PBE processes, resulting in enhanced audio quality and noise cancellation even with small speakers.
Implementation Method 1
ANC is a technique to perform noise suppression through the production of acoustic waves equal in amplitude, but 180° out of phase relative to the target noise being suppressed. This generated anti-noise cancels out the background noise through destructive interference.
Implementation Method 2
the PBE module converts real bass content into virtual bass, offloading the physical burden from less ideal speakers and linking tuning parameters with ANC and other audio processing modules for real-time adjustments
Data Source
AI summary
Psychoacoustic Bass Enhancement (PBE) is integrated with one or more other audio processing techniques, such as active noise cancellation (ANC), and/or receive voice enhancement (RVE), leveraging each technique to achieve improved audio output. This approach can be advantageous for improving the performance of headset speakers, which often lack adequate low-frequency response to effectively support ANC.