I was trying to think of ways that a multiple, or a fraction, of a sine wave could be generated digitally. Let's say I wanted to generate a 100Hz sine wave from a 1KHz sine wave. If the 1KHz sine wave was sampled every millisecond, the output would be a DC equivalent related to the duty cycle. If, on the other hand, every sample period was incrementally advanced 36° couldn't you plot the equivalent of a 100Hz sine wave?
Is there a way to increment the sample-period with counters?
EDIT: The DC voltage would be related to the phase.