Rate buys bandwidth, depth buys a lower noise floor, and they do not trade against each other. Then the part everyone gets wrong: quantisation does not make a waveform steppier, and dither is not a compromise.
The previous lesson said a digital signal is a list of measurements taken at a fixed rate, each rounded to one of a finite set of values. This lesson is about what those two choices cost and what they buy — and they buy completely different things.
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