Update: 30 September, 2023
This application note describes a simple and easy-to-use solution to help design and develop products with an audio output, for example, toys, alarms, door bells, and white goods. Audio data generally require the storage of a lot of memory. However, the memory space needed to preserve such data can be reduced by compressing the audio data via a specified compression method. Processing these data is usually a complex task requiring powerful microcontrollers such as DSP or audio chip. Normally, 8-bit microcontrolles do not offer either a large memory or a high computing performance. The software solution offered in this application note 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 advanced STM8L core with its 3-staged pipeline and 16 MIPS peak performance. The digital samples are converted to an analog signal by an on-chip, 12-bit, digital-to-analog converter (DAC). This offers good overall audio quality, yet is a cost-effective solution for 8- bit microcontroller applications. The battery-powered application benefits from the ultra low-power consumption of STM8L microcontrollers. The example firmware and application hardware design are provided with this application note to enable easy porting of the offered solution to the f
File format: PDF
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MD5 Checksum: 573D9646E63732D154325B5469466EF7
Publication date: 07 August, 2012
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PDF Link: ST AN3225 Application Note PDF