Audio processing

This section describes the functionality of each lib_voice modules, diving into the details of the underlying DSP.

All the modules have been designed to be used together in a voice processing pipeline, but they can also be used independently or in custom combinations. The modules have been designed to work with a 16 kHz sample rates, but may work at other samples rates if the time domain parameters are adjusted correctly.

Many of the modules in lib_voice use block floating point (BFP) arithmetic to achieve high performance on fixed-point hardware. In BFP, a block of data shares a common exponent, allowing for efficient scaling and dynamic range management. For more information on BFP, see the XCore BFP documentation.

• Acoustic Echo Canceller
• Interference Canceller
• Voice to Noise Ratio Estimator
• Noise Suppressor
• Automatic Gain Control
• Automatic Delay Estimation and Correction
• Pipeline Stage 1