Scott W Harden looks into storing sounds in a microcontroller, starting with the very diminutive ATmega 328P on the Arduino Uno R3.
Reading numbers from a speaker is an interesting and simple alternative to displaying numbers on a display, which often requires complex multiplexing circuitry and/or complex software to drive the display. This page describes the techniques I used to extract audio waveforms from MP3 files and encode them into data that can be stored in the microcontroller flash memory. STM32F103RBT6
Because microcontrollers have a limited amount of flash memory this method is not suitable for long recordings, but it is fine for storing a few seconds of audio at a limited sample rate. Unlike more common methods for playing audio with a microcontroller, playing audio from program memory does not require a SD card, special hardware, or complex audio decoding software. Although this technique works best when a speaker is driven with a amplifier circuit, I found acceptable audio can be produced by driving a speaker directly from a microcontroller pin. This technique makes it possible to play surprisingly good audio without requiring any components other than a speaker.
See Scott’s work in the blog post here.
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