Portable Microphone Array Beamforming for Noise Isolation
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Solution Overview
Problem
Existing microphone array systems struggle to effectively capture and isolate target audio signals in complex environments with multiple sound sources and significant noise interference, particularly in high noise environments and reverberant spaces, due to limitations in directional audio pickup and adaptive beamforming techniques.
Innovation Solution
A portable microphone array system with a housing configured for mobile electronic devices, featuring a microphone array and output circuitry that delivers beamformed audio signals, along with an audio processing module capable of determining acoustic propagation models and applying whitening filters to suppress non-target audio signals, allowing for improved Signal-to-Noise Ratio (SNR) and robust noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional microphone systems are used to capture audio in noisy environments, then the system structure remains simple, but the signal-to-noise ratio deteriorates and target audio signals cannot be effectively isolated
Solution Approach 1:
The patent divides the audio capture task into multiple segments by using multiple microphone transducers arranged in an array. Each microphone captures audio from a slightly different position, and through beamforming processing, the system segments and combines these signals to isolate target sounds from noise, achieving 15 dB or more SNR improvement.
Solution Approach 2:
The patent combines multiple microphone signals through beamforming processing to achieve superior noise reduction. By merging the outputs of multiple transducers and applying constructive and destructive interference patterns, the system consolidates target audio signals while canceling out noise, achieving enhanced signal-to-noise ratio without requiring complex external processing equipment.
2Measurement precision
If beamforming techniques are applied to isolate target audio signals, then audio quality in noisy environments improves, but the processing complexity and computational requirements increase
Solution Approach 1:
The patent performs preliminary beamforming processing directly at the microphone array stage, creating steerable directional pickup patterns before signals are fully processed. By pre-establishing the directional filtering and noise reduction capabilities in the hardware configuration and initial signal processing, the system reduces the computational burden on subsequent processing stages while maintaining high audio signal isolation performance.
3Adaptability or versatility
If fixed directional pickup patterns are used, then the system structure remains simple, but the system cannot adapt to changing sound source locations and environments
Solution Approach 1:
The patent implements dynamic beamforming capabilities where the directional pickup pattern can be electronically steered and adapted in real-time. The system uses data-dependent beamforming techniques that automatically adjust the pickup pattern based on the actual acoustic environment and sound source locations, allowing the microphones to adapt their sensitivity directions dynamically without physical reconfiguration.
Solution Approach 2:
The patent changes the electrical parameters (time delays, phase shifts, and weighting coefficients) of the microphone array to dynamically adjust the beamforming pattern. By modifying these parameters based on environmental feedback and sound source detection, the system achieves adaptability to different acoustic scenarios, speaker positions, and noise conditions without altering the physical microphone configuration.
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 system achieves significant SNR improvements (15 dB or more) and enhanced audio quality by processing audio inputs to isolate target audio signals from non-target signals, even in underdetermined acoustic conditions, providing clear audio outputs in noisy and reverberant environments.
Implementation Method 1
a microphone array configured to receive an arriving audio signal
Implementation Method 2
a plurality of transducers disposed on a surface of the portable housing, the plurality of transducers comprising a microphone array
Data Source
AI summary
An apparatus, system and method for a portable microphone array system comprising a computing device and a case having an array of microphones embedded or integrated into the case. A user may position the laptop and case facing the general direction of a target audio source to capture a target acoustic audio input at the microphone array. The microphone array may deliver a first stage of beamformed audio from the acoustic audio input to the computing device via a communications interface or bus. The computing device may comprise an audio processor configured to perform one or more successive audio processing steps to process the audio input and render a digital audio output. The digital audio output may be outputted from the computing device to an audio output device, such as headphones or an earpiece.