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October 2008 Rev 2 1/21
AN2812
Application note
Vocoder demonstration using a Speex audio codec
on STM32F101xx and STM32F103xx microcontrollers
Introduction
This application note describes how to implement the codec Speex software on the
STM32F101xx and STM32F103xx microcontrollers to build a vocoder application.
Speex is a free audio codec dedicated to speech encoding and decoding. It provides a high
level of compression with a good quality of sound. That makes it a high-performance
solution for any application using message playback or a voice recorder, like answering
machines, building and home safety systems, intercoms, smart appliances, voice recorders
or walkie-talkies.
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