Audio Front End Algorithm
Overview
AFE (Audio Front-End) is a professional-grade speech enhancement algorithm independently developed by Realtek. It employs multi-dimensional signal processing techniques to significantly improve speech clarity and signal-to-noise ratio (SNR), delivering robust audio solutions for speech recognition and real-time communication.
Professional Signal Processing:
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AEC (Acoustic Echo Cancellation) Dual-stage linear cancellation + residual suppression for effective echo removal
BF (Beamforming) Multi-microphone spatial filtering for targeted speech enhancement
NS (Noise Suppression) Supports signal processing and neural network two modes for noise reduction
AGC (Automatic Gain Control) Fixed + adaptive gain adjustment for stable output levels
SSL (Sound Source Localization) 360° directional tracking with microphone arrays
Key Advantages
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Full-Scenario Coverage
Supports speech recognition (AFE_FOR_ASR) and voice communication (AFE_FOR_COM) modes
Compatible with near-field and far-field pickup
Adaptable to 1mic/2mic/3mic microphone array configurations
Flexible Customization
Standard array spacings (dual-mic: 30mm/50mm/70mm; three-mic: 50mm)
Fully configurable algorithm parameters for scenario-specific optimization
Custom algorithm development services
Software Resources
Recommended ICs
Feature |
||||
|---|---|---|---|---|
AFE Single MIC (Speech Recognition Mode) |
Y |
Y |
Y |
Y |
AFE Single MIC (Voice Communication Mode) |
- |
Y |
Y |
Y |
AFE Dual MIC (Speech Recognition Mode) |
- |
Y |
Y |
Y |
AFE Three MIC (Speech Recognition Mode) |
- |
Y |
Y |
Y |
AEC (Speech Recognition Mode) |
Y |
Y |
Y |
Y |
AEC (Voice Communication Mode) |
- |
Y |
Y |
Y |
BF (Speech Recognition Mode) |
- |
Y |
Y |
Y |
BF (Voice Communication Mode) |
- |
- |
- |
- |
NS (Speech Recognition Mode) |
Y |
Y |
Y |
Y |
NS (Voice Communication Mode) |
- |
Y |
Y |
Y |
AGC (Speech Recognition Mode) |
Y |
Y |
Y |
Y |
AGC (Voice Communication Mode) |
- |
Y |
Y |
Y |
SSL (Speech Recognition Mode) |
- |
Y |
Y |
Y |
SSL (Voice Communication Mode) |
- |
- |
- |
- |
KWS Fixed Keyword |
Y |
Y |
Y |
Y |
KWS User-defined Keyword |
- |
Y |
Y |
Y |
VAD |
Y |
Y |
Y |
Y |
ASR |
- |
Y |
Y |
Y |