Dynamic Beamforming for Speakerphone Speech Pickup
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Solution Overview
Problem
Conventional microphone systems for speakerphones face challenges in maintaining speech intelligibility due to room reverberation, as they either become overly complex and noisy in high-reverb environments or offer no benefit in low-reverb environments, making fixed directional systems suboptimal.
Innovation Solution
A method and system that dynamically adjust the microphone signal processing by mixing directional and omnidirectional signals based on room characteristics, using an algorithm to focus and steer sound pickup direction, and continuously update the mixing ratio to optimize speech pickup while rejecting noise and reverberation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a directional microphone system is used to improve speech intelligibility in high-reverb rooms, then speech intelligibility is improved, but device complexity and microphone noise are amplified
Solution Approach 1:
The patent implements dynamic adaptation of the microphone system's directional characteristics based on real-time room reverberation assessment. The system transitions from fixed directional patterns to dynamically adjustable beamforming that adapts its focus and width according to the measured acoustic environment, resolving the contradiction between improving speech intelligibility and reducing system complexity
Solution Approach 2:
The system changes the parameters of the microphone array's pickup pattern based on room conditions. By adjusting the beamforming parameters (focus direction, beam width, null positions) according to measured reverberation characteristics, the system optimizes speech intelligibility without requiring overly complex fixed structures
2Measurement precision
If a directional microphone system is used to improve speech pickup, then directionality is improved, but microphone noise is amplified
Solution Approach 1:
The system dynamically adjusts the balance between directionality and noise rejection based on room conditions. In low-reverb environments, the system reduces directional focus to minimize noise amplification, while in high-reverb environments, it increases directionality to improve speech pickup, thus resolving the contradiction between measurement precision and harmful factors
3Ease of manufacture
If a fixed directional system is used for all rooms, then implementation is simplified, but performance becomes suboptimal in low-reverb environments
Solution Approach 1:
The system performs self-assessment of the room's acoustic characteristics and automatically adjusts its microphone signal processing accordingly. By measuring the room's reverberation properties and autonomously optimizing the beamforming parameters, the system achieves adaptive performance without requiring manual configuration or complex fixed structures for different environments
Data Source
AI summary
A method for optimizing speech pickup in a speakerphone system, wherein the speakerphone system comprises a microphone system placed in a specific configuration, wherein the method comprising receiving acoustic input signals by the microphone system, processing said acoustic input signals by using an algorithm for focusing and steering a selected target sound signal towards a desired direction, and transmitting an output signal based on said processing.