Common Functions > Carrier and envelope

The image on the left shows from top to bottom:

  • The sine in time, whose frequency is possible to modify,
  • The envelope in time (light blue curve) and the sine modulated by the envelope (bold blue curve) and it is possible to vary the amount of decay.

The image on the right shows from top to bottom:

  • The modulus of the FT of the sine function
  • The moduli of the FT of the envelope (light red curve) and the sine modulated by the envelope (bold red curve).

We note that the sine function introduced a translation of the spectrum of the envelope. The asymmetry of the observed spectrum is due to the contribution of the Dirac situated in the negative frequencies.