Before revision: Instantaneous frequencyInstantaneous angular frequency is defined as: and instantaneous (ordinary) frequency is defined as: where φ(t) must be the unwrapped phase; otherwise, if φ(t) is wrapped, discontinuities in φ(t) will result in Dirac delta impulses in f(t).
After revision: FormulationsInstantaneous angular frequency is defined as: and instantaneous (ordinary) frequency is defined as: where φ(t) must be the unwrapped phase; otherwise, if φ(t) is wrapped, discontinuities in φ(t) will result in Dirac delta impulses in f(t).