The ADPCM algorithm in STM32F1xx and STM32L1xx microcontrollers

Audio data usually are very demanding in terms of memory storage, the needed memory space can be reduced by compressing the audio data via a specified compression method.

The STSW-STM32022 software solution reconstructs audio signals from compressed samples. A simple audio codec based on an adaptive differential pulse coded modulation (ADPCM) algorithm is used and advantage is taken of the powerful ARM® Cortex® M3 core.

The STSW-STM32022 is developed for standard library package and intended to be used with STM32L1xx discovery board or STM32F1xx evaluation board, therefore this implementation will be easily portable to other platforms.

For more details on ADPCM algorithm in STM32F1xx microcontrollers, refer to application note AN2931.

For more details on ADPCM algorithm in STM32L1xx microcontrollers, refer to application note AN4453.

Key Features

  • ADPCM algorithm features
    • Light memory footprint
    • Selectable sampling rates
    • Selectable quality/compression ratio
  • STM32F1 implementation features
    • Ease of use with the I²S Audio codec
    • Friendly user interface by the mean of the LCD
  • STM32L1 implementation features
    • Simple PWM audio signal generation
    • Limitation of the external components

Design

Technical Documentation

Product Specifications
Description Version Size
DB2559 DB2559: Implementing the ADPCM algorithm in STM32F1xx and STM32L1xx microcontrollers 1.0 111 KB
Application Notes
Description Version Size
AN4453 AN4453: Implementing the ADPCM algorithm in STM32L1xx microcontrollers 2.0 366 KB
AN2931 AN2931: Implementing the ADPCM algorithm in high-density STM32F103xx microcontrollers 2.4 155 KB

Legal

License Agreement
Description Version Size
SLA0048 SLA0048: Mix Liberty + OSS + 3rd- party V1 - SOFTWARE LICENSE AGREEMENT 2.17 112 KB

Get Software

Part Number Software Version Marketing Status Supplier Order from ST
STSW-STM32022 2.0.0 Active ST

 

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