# Dictionary:Fig R-14

FIG. R-14.
**Ricker wavelet**. (**a**) Time-domain and (**b**) frequency-domain representations. Expressions for the Ricker wavelet are:

The amplitude *f(t)* of the Ricker wavelet with peak frequency *f _{M}* at time

*t*is given by,

- .

The frequency domain representation of the wavelet is given by,

Where,

- and .

The mean frequency and the median frequency .

Sometimes the period (somewhat erroneously referred to occasionally as the wavelength) is given as 1/*f*, but since it has mixed frequencies, this is not quite correct, and for some wavelets is not even a good approximation. In fact, the Ricker wavelet has its sidelobe minima at

These minima have the value