![]() Without more information about the hardware you are using, there's not a lot to add here. For example, if you have a microphone as your sound input source, you will need to amplify the signal (and maybe add some automatic gain control) before feeding it into an ADC (analog to digital converter) that has a 5 V input range, since the microphone may have an output in the mV range. Items (1) and (3) are related, since you need to know how you are going to digitize the signal before you can choose the right amplitude. Digitizing and storing the data for later processing.Getting the signal to the right amplitude.This breaks down into three separate sub problems: ![]() Problem #1: converting audio signal into a stream of numbers This means that you need to convert them into a stream of numbers first. Presumably, your audio signals are "coming from somewhere" - i.e. I am going to help you think through the problem - asking yourself the right questions is essential to get any answers. ![]() ![]() You are asking a very fuzzy question: "How should I build audio signals which ultimately can be turned into FFTs and the Arduino can analyse the same using the library and I can actuate anything?".
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