In signal processing multiplication of signals is sometimes done deliberately, at other times it happens unintentionally. The applet below shows the spectrum of sin, sin

eg parameters:-

for f(t) = sin(w1 t) (3.0, NA, 2.0, 6.07, 35, NA, 16, 10, 15.0, 0.4) show that f(t) has 1 line at w1,

(f(t))

while (f(t))

(3.0, NA, 2.0, 6.60, 45, NA, 16, 10, 15.0, 0.4)

The DFT spectra now looks very different.

COPYRIGHT © 2007 Cuthbert Nyack.