# Translations:The wavelet/1/en

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Power signals are signals with finite power, and energy signals are signals with finite energy (Anstey, 1958^{[1]}). A wavelet is defined as an energy signal that is concentrated in a certain time interval. As a result, an arrival time, or origin time, can be associated with a wavelet. The arrival time is the reference point of the wavelet and usually is designated as time zero. Thus, a wavelet is a signal characterized by two properties:

- ↑ Anstey, N. A., 1958, Why all this interest in the shape of the pulse: Geophysical Prospecting,
**6**, no. 4, 394–403.