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Complex FFT

Question asked by Kilohercas on Aug 6, 2012
Hello, i am working on science project involving fast calculations for laser stabilization.
I need to calculate complex FFT and get phase of second maximum in spectra (first will be 1/f noise, second should be right signal)
since i only need to calculate one complex point in frequency domain, what is fastest way to do that ?
(idea is to read CCD array, use 16b adc to read data to STM32F4 and make 16/32/64 or 128 point CFFT for one point, and send that value to laser via DAC )
and what kind of speed i should expect ?