Voice Recognition Noise Suppression via Dynamic Directional Switching
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Solution Overview
Problem
Current voice recognition systems in complex environments, such as vehicles and public devices, face challenges with noise interference and directional voice reception, leading to reduced accuracy and operational interference.
Innovation Solution
A voice recognition device incorporating a position retrieving module, directional voice receiving device, noise suppressor, and voice recognition processor, which identifies the physical voice position and filters noise to enhance voice recognition accuracy and directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If directional microphones are used to improve voice receiving directionality, then voice recognition accuracy is improved, but the ability to receive voices from all directions is lost
Solution Approach 1:
The patent implements dynamic switching between omnidirectional and directional microphone modes based on the detected voice source position. When a voice source is detected in a specific direction, the system switches to directional mode to enhance accuracy for that direction. When no specific direction is detected or for general conversations, the system uses omnidirectional mode to capture voices from all directions. This dynamic adaptation resolves the contradiction by making the microphone behavior flexible rather than fixed.
Solution Approach 2:
The patent changes the microphone array configuration parameters dynamically. By adjusting the beamforming weights and directional sensitivity patterns based on voice source position detection, the system transforms the microphone array between omnidirectional and directional characteristics. This parameter change allows the same hardware to achieve both high directional accuracy and broad coverage capability as needed.
2Adaptability or versatility
If omnidirectional microphones are used to receive voices from all directions, then voice receiving coverage is improved, but noise interference and feedback effects increase
Solution Approach 1:
The patent applies local quality enhancement by focusing the microphone array's sensitivity in specific directions when needed. Instead of uniform omnidirectional coverage, the system creates localized high-sensitivity zones in the direction of the detected voice source while maintaining lower sensitivity in other directions. This local quality improvement reduces noise from unwanted directions while preserving the ability to receive voices from any direction when necessary.
Solution Approach 2:
The system dynamically adjusts the microphone array's directional characteristics based on real-time voice source detection. When a voice source is detected, the system switches to directional mode to reject noise from other directions. When no specific source is detected, it reverts to omnidirectional mode for maximum coverage. This dynamic behavior allows the system to optimize noise rejection without permanently sacrificing coverage capability.
3Ease of operation
If non-directional microphones are used in central control systems, then ease of operation is improved, but voice receiving quality is degraded by feedback and noise
Solution Approach 1:
The patent implements self-service functionality where the microphone array automatically detects voice source positions and adjusts its directional characteristics without user intervention. The system autonomously switches between omnidirectional and directional modes based on detected voice patterns, eliminating the need for manual microphone configuration or user awareness of directional settings. This maintains ease of operation while significantly improving voice receiving quality through automatic noise rejection.
Solution Approach 2:
The system automatically changes microphone array parameters such as beamforming weights and directional sensitivity based on detected voice source position. These parameter changes occur transparently in the background, improving voice receiving quality without requiring user knowledge or manual adjustment. The automatic parameter adaptation resolves the contradiction by making the advanced directional capability as simple to use as basic omnidirectional recording.
4Measurement precision
If high-sensitivity microphones are used to accurately receive all participant voices in conferences, then voice receiving sensitivity is improved, but directional control and noise suppression capability are reduced
Solution Approach 1:
The patent implements dynamic switching between high-sensitivity omnidirectional mode and directional mode with noise suppression. When conference participants are detected, the system uses high-sensitivity omnidirectional recording to capture all voices. When a single speaker is detected or directional input is needed, the system switches to directional mode with enhanced noise suppression. This dynamic adaptation maintains high sensitivity when needed while providing directional control when required, resolving the contradiction between sensitivity and directional capability.
Data Source
AI summary
A voice recognition device includes at least one position retrieving device, a directional voice receiving device, a noise suppressor, and a voice recognition processor. The position retrieving device is sequentially coupled to the directional voice receiving device, the noise suppressor, and the voice recognition processor. The position retrieving device retrieves the physical voice position of a voice source and outputs the voice position to the directional voice receiving device. The directional voice receiving device receives a voice signal generated by the voice source according to the voice position. The noise suppressor eliminates the noise of the voice signal to generate a voice recognition signal based on noise model corresponding to the voice position. The voice recognition processor receives the voice recognition signal and generates an operating signal based on the voice recognition signal.