Hi there. No. Nyquist frequency allow original _sampled_ signal to be fully reconstructed using a IDFT. It does not mean that the reconstructed signal will have anything more than the original samples. If you sample an incoming analog signal at 2 samples per second (sps), you'll definitely not be able to reconstruct ALL the phases and ALL the frequencies between 0 and 1 Hz. You'll get, however, a correct reconstruction of a periodic signal if it lasts long enough. This is due to the inherent impossibility, using a DFT, to get both accurate space and time resolutions at the same time. Just try this "simple" experience: sample a 1 Hz pulse that is triggered after a random non-quantized delay that is less than four seconds. Sample it at a rate of 2 sps and then, try to get the original signal back with all its components (phase and frequency). Good luck. This is just as impossible as saying that you can compress the information stored in any analog signal in a finite number of samples. Mickael Vardo