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Speex DSP Extension

About Speex DSP

SpeexDSP is a patent-free, Open Source/Free Software DSP library that is derived from the Speex library. You can find more information at

The Speex DSP Extension provides the following audio nodes for a Switchboard SDK audio graph:

EchoCancellerNodeRemoves acoustic echo from microphone signal.
PreprocessorNodeApplies automatic gain control (AGC) and noise suppression on the voice signal.