reducing sample period

hello have read several thread according this, not sure whether can speed analog read or search more resolutions bit provided adc external kit

i have observe this
http://forum.arduino.cc/index.php?topic=137635.0
http://forum.arduino.cc/index.php?topic=6549.0

they can modify adc prescale default 128, change 16 or may use "running mode" techniques

i wondering how sample analog input , reducing sample period means increasing sample frequency. , result can plot more data serial

this picture may can describing problem


as showed above image, let say, n=1 has value 3.5 , n=2 has 5 <- current situation. want make arduino plot data reduced sample period result n=1 has 1.75, n=2 has 3.5, n=3 has 4.25, n=4 has 5 ...in other words, there 2x sampling frequency.

and use, arduino uno board

any idea?

regards

if want interpolate between samples can quite easily.

otherwise need set prescaler sample time takes less time => less precise

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