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Equation for a Chirp

  1. Jan 4, 2007 #1
    Can anyone give me a general equation for a sinusoidal chirp.

    I want to calculate a waveform where the frequency drops a given fraction over a given number of cycles.
  2. jcsd
  3. Jan 4, 2007 #2
    A chirp is a sinusoidal signal whose frequency changes with time.

    For example, a linear chirp has the form [tex] A Sin(a t^2) [/tex] because its frequency [tex] at [/tex] is a linear function of time.

    A chirp for which the frequency decreased by a fixed fraction per time would involve exponential decay i.e. the frequency would have a half life. These chirps sound like space-blaster sound effects.
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