The Adafruit Boards
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Any real-time audio application running on the microcontroller will need to acquire data from a source (for instance, a microphone) and deliver data to an output sink (for instance, an digital-to-analog converter connected to a loudspeaker) that we can listen to. Here is a brief description of the components we selected.
The component used to capture sound is the by Adafruit. The actual microphone on this mini-board produces an analog signal (continuous in time and amplitude) but the device also contains an Analog-to-Digital Converter that returns a digital signal (discrete in time and amplitude), which is the format we need in order to pass the data to our microcontroller. We will describe the component in more detail .
The microcontroller accepts and produces digital signals; in order to playback its output on a pair of headphones, it is necessary to create an analog signal and this can be achieved via a Digital-to-Analog Converter (DAC). We will use Adafruit's , which contains the DAC, an audio jack for connecting headphones, and the necessary additional components. We will describe the DAC in more detail .
