Directional Microphone Array for Signal Separation
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Solution Overview
Problem
Existing audio-related systems face challenges in efficiently separating desired signals from mixed signals containing noise or echo, particularly in environments where additional hardware or software resources are not feasible for real-time signal separation.
Innovation Solution
A directional microphone array system that includes at least one microphone oriented in a first direction and another in a different direction, with a signal receiving section that cancels undesired signals from the mixed signal using a reference signal received through the second microphone, employing blind source separation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional signal separation methods (LMS, BSS, ICA) are used, then signal separation capability is improved, but hardware structure complexity and resource consumption increase
Solution Approach 1:
The system segments the microphone array into multiple directional microphone groups, where each group is oriented in a different direction. This segmentation allows the system to capture signals from multiple directions simultaneously using simple directional microphones, avoiding the need for complex post-processing separation algorithms while achieving effective signal separation through the directional characteristics of each microphone group.
2Measurement precision
If conventional signal separation methods are used, then signal separation capability is improved, but additional hardware or software resources are required
Solution Approach 1:
The directional microphone array system serves multiple functions: it captures desired signals from specific directions while simultaneously capturing reference signals from other directions. The same physical microphones are used for both signal capture and reference signal acquisition, eliminating the need for separate hardware resources dedicated to reference signal collection that would be required by conventional echo cancellation systems.
3Ease of manufacture
If directional microphone array is used, then signal separation is simplified, but microphone array configuration complexity increases
Solution Approach 1:
The system employs asymmetric directional microphone configurations where microphones are oriented in different directions (e.g., forward, backward, left, right) rather than symmetric arrangements. This asymmetric positioning creates distinct directional sensitivity patterns that naturally separate signals from different directions, simplifying the signal processing requirements while the physical configuration remains straightforward to implement.
Data Source
AI summary
A signal separation system using directional microphone array and a method for providing same. The signal separation system using directional microphone array includes a signal receiving section which receives a mixed signal in which a first audio signal and a second audio signal are mixed using the directional microphone array, the directional microphone array including at least one first microphone oriented in a first direction and at least one second microphone oriented in a direction different from the first direction, and receives a reference signal through the at least one second microphone. An audio signal separating section cancels the second audio signal from the mixed signal received by the signal receiving section, based on the reference signal inputted through the at least one second microphone.