Get back to us when you actually know what Fourier is all about.

You only need two samples per cycle to reproduce a given pure
frequency (sine wave) perfectly.

To reproduce a 4kHz sine wave, you only need to sample at 8kHz.


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.fleetie.demon.co.uk