Multi-channel Digital Microphone Array Spatial Noise Suppression
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Solution Overview
Problem
Single microphones have limited pickup range and suffer from noise interference due to superposition of sound sources and noise, leading to reduced audio quality, as conventional noise suppression techniques struggle to effectively separate audio signals and suppress noise in complex environments.
Innovation Solution
A multi-channel digital microphone system with an array pickup unit comprising multiple modules that capture audio signals from different spatial directions, converting them into digital signals for processing to improve noise reduction and audio quality, utilizing a processing unit for denoising and a USB interface for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single microphone is used, then the device complexity is low, but the audio quality deteriorates due to limited pickup range and noise interference
Solution Approach 1:
The single microphone is segmented into multiple pickup modules arranged in an array, where each module captures audio from different spatial directions. This segmentation enables the system to distinguish between desired sound sources and noise based on their spatial distribution, thereby improving audio quality while managing complexity through modular design
Solution Approach 2:
The invention transitions from a single-point pickup (0D) to a spatial array pickup (3D) by arranging multiple pickup modules in specific geometric configurations. This dimensional change adds spatial information to the audio signal processing, enabling noise suppression through spatial filtering and beamforming techniques
2Object-affected harmful factors
If conventional filtering techniques are used for noise suppression, then the device complexity remains low, but the noise suppression effectiveness deteriorates due to overlapping audio signals in time and frequency spectrum
Solution Approach 1:
The system adds a spatial dimension to the traditional time-frequency domain noise suppression. By capturing audio signals from multiple spatial directions, the system creates a spatial spectrum that provides additional degrees of freedom for separating desired signals from noise, enabling more effective noise suppression even when signals overlap in time and frequency domains
Solution Approach 2:
The patent introduces spatial filtering and beamforming algorithms as intermediary processing steps between signal capture and final output. These intermediaries use spatial information from the microphone array to selectively enhance desired sound sources while suppressing noise, acting as a bridge between raw multi-channel signals and cleaned audio output
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 audio quality by effectively separating audio signals and suppressing noise from multiple directions, improving the signal-to-noise ratio and enabling better sound source localization.
Implementation Method 1
the pickup module uses silicon thin films to pick up the audio signal of the spatial region component
Data Source
AI summary
The present invention relates to a multi-channel digital microphone, comprising: an array pickup unit and a processing unit, the array pickup unit comprises a plurality of pickup modules, arranged in array form, wherein each of the pick-up modules picks up the audio signals of the spatial region component, the array pickup unit converts a plurality of the audio signals of the spatial region component to a plurality of digital signal and outputs it; the pickup unit is connected to the processing unit, configured to extract and denoise the plurality of digital signals. The present invention adds a spatial region based on the time region and frequency region so that a pick-up de-noising process can be done for these received signals from different spatial directions.