Just quick on the question of the large ringbuffer. One of the things I want to measure is phrases on what I call digital valves (I am busy with a musical instrument). These digital valves are potmeters with a spring. I want to measure from the time that one of the valves gets depressed till all the valves are up again (0). I do that by collecting the write address at the beginning of the phrase (moment of first depression) and the end of the phrase (all valves up). I then analyse the phrase: which valves were depressed when and what was the rhythm of depression. I estimate the very maximum length of a phrase to be about 10 seconds. One measurement per ms is probably a good enough resolution for that. On another analog input I measure the pitch and other sound 'descriptors' from sound picked up by a microphone, hence the 22050 Hz sampling frequency. This only needs a buffer of 512 samples for FFT analysis.
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