# Release Notes for AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" Copyright © 2009 STMicroelectronics
## Contents What's New in AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" V2.0.0 What is AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers"? AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" update History License ## What's New in AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" V2.0.0? The AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" V2.0.0 is an update of V1.0.0 that makes the application note compliant with the Cortex™ microcontroller software interface standard (CMSIS). ## What is AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" V2.0.0"? The AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" 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. The AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" is full CMSIS compliant. ## AN2812 "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" V2.0.0 update History ### V2.0.0 - 04/27/2009 AN2812 V2.0.0 updated with STM32F10x Standard Peripherals Library (StdPeriph_Lib) V3.0.0 AN2812 V2.0.0 is full CMSIS compliant STM32F10x Standard Peripherals Library Structure is updated. AN2812 Package Architecture is enhanced For more details, please refer to AN2953 "How to migrate from the STM32F10xxx firmware library V2.0.3 to the STM32F10xxx standard peripheral library V3.0.0". ### V1.0.0 - 09/08/2008 Created. ## License The enclosed firmware and all the related documentation are not covered by a License Agreement, if you need such License you can contact your local STMicroelectronics office. THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. For Complete on STM32(CORTEX M3) 32-Bit Microcontrollers visit www.st.com/STM32