BF (Beamforming)

Supported ICs

• Speech Recognition Mode

  • RTL8726E

  • RTL8713E

  • RTL8730E

• Voice Communication Mode

  • Not Supported

Overview

Beamforming (BF) is a key module in AFE. When the system has two or more microphones, they can form an array to enhance speech signals using multi-channel information.

Algorithm Description

In AIVoice, BF currently supports only speech recognition mode. In this mode, BF is automatically enabled when using the following AFE resources:

• 2mic_30mm

• 2mic_50mm

• 2mic_70mm

• 3mic_50mm

To disable the BF module, switch to a 1mic resource instead.

Configurations

The complete AFE configuration file is located at ${aivoice_lib_dir}/include/aivoice_afe_config.h. The BF-related configurations include:

afe_mic_geometry_e  mic_array;          // microphone array. Make sure to choose the matched resource library

afe_mode_e afe_mode;                    // AFE mode, for ASR or voice communication.