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  • 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.

    主な特徴

    • 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

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技術文書

    • 概要 バージョン サイズ アクション
      DB2559
      Implementing the ADPCM algorithm in STM32F1xx and STM32L1xx microcontrollers
      1.0
      111.16 KB
      PDF
      DB2559

      Implementing the ADPCM algorithm in STM32F1xx and STM32L1xx microcontrollers

    • 概要 バージョン サイズ アクション
      AN4453
      Implementing the ADPCM algorithm in STM32L1xx microcontrollers
      2.0
      366.21 KB
      PDF
      AN2931
      Implementing the ADPCM algorithm in high-density STM32F103xx microcontrollers
      2.5
      156.03 KB
      PDF
      AN4453

      Implementing the ADPCM algorithm in STM32L1xx microcontrollers

      AN2931

      Implementing the ADPCM algorithm in high-density STM32F103xx microcontrollers

プレゼンテーション & トレーニング資料

    • 概要 バージョン サイズ アクション
      STM32 and STM8 embedded software solutions 7.0
      3.12 MB
      PDF

      STM32 and STM8 embedded software solutions

法務

    • 概要 バージョン サイズ アクション
      SLA0048
      Mix Ultimate Liberty+OSS+3rd-party V1 - SOFTWARE LICENSE AGREEMENT
      5.7
      87.58 KB
      PDF
      SLA0048

      Mix Ultimate Liberty+OSS+3rd-party V1 - SOFTWARE LICENSE AGREEMENT