# Dictionary:Doublet

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{{#category_index:D|doublet}}
(dub’ lit) **1**. Two closely spaced peaks on a seismic trace, between which the trace does not cross the zero-amplitude axis. **2**. A two-stick wavelet [*a,b*], whose *z*-transform is *a*+*bz*. If |*a*|>|*b*|, [*a,b*] is **minimum phase**; if |*a*|<|*b*|, **maximum phase**. Sometimes called a **dipole. 3**. See *doublet modulation*. **4**. The first derivative of the Dirac delta function.