Talk:Undersampling

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Real valued[edit]

"Real-valued signals have Fourier spectra with symmetry about zero. "

What is a real-valued signal? Are there any other kinds of signals? -Abdull (talk) 15:33, 7 February 2010 (UTC)

Yes. In modems, an equivalent baseband signal consists of an Inphase (I) and a Quadrature phase (Q) component, often combined into a complex valued I+jQ signal. I is modulating a cosine carrier wave, and Q a sine carrier wave, resulting in a real-valued carrier-modulated physical so-called passband signal, for example a radio frequency (RF) signal. Mange01 (talk) 23:55, 8 February 2010 (UTC)

.[edit]

"See aliasing for a simpler formulation of this Nyquist criterion that specifies the lower bound on sampling rate (but is incomplete because it does not specify the gaps above that bound, in which aliasing will occur)"

In my opinion that doesn't fit too well there... ANDROBETA (talk) 21:27, 14 July 2010 (UTC)