The minimal phase wavelet has a short time length and an energy concentration near the beginning of the wavelet. It is zero before to zero (causal). A spike (highest amplitude at all frequencies) would be an ideal seismic source, but the best practical one would be a minimum phase. In **other words**, its magnitude squared amplitude should decrease without limit as **frequency increases**.

Minimal phase can be achieved by using an impulse as initial condition for the wave equation. The resulting wave will be zero before the arrival time of the initial pulse and have infinite energy thereafter. This means that no energy is lost due to radiation because it is taken up by the environment after the first arrival.

A wavelet is a wave-like oscillation with an amplitude that starts at zero, grows, and then returns to zero. Wavelets are often designed with certain features that make them effective for signal processing. For example, wavelets can be chosen to have a compact support (i.e., they are nonzero only for a small interval of time), which makes them useful in reducing or removing noise from signals.

The term "wavelet" was introduced by Jean Morlet in 1982. The original work focused on analyzing the time evolution of quantum states, but the concept has since been extended to include other types of functions. Today, the term "wavelet" is used to describe any function that produces localized pulses of energy in a continuous signal. The wavelet method is one of many methods for analyzing signals involving using waves to model the behavior of signals or systems. It can be applied to time series analysis, spectral estimation, and function reconstruction.

In mathematics, the wavelet basis is an orthonormal basis for L2[0,1]. Each element of **this basis** is called a wavelet. The wavelet transform is a linear transformation that maps the coefficients of **a discrete-time signal** (which are usually vectors) into the coefficients of **a corresponding wavelet decomposition**.

A wavefront is the location of **all particles** that are in phase with one another. The circular ring's points are all in phase. A wavefront is a ring like this. A wavelet is an oscillation that begins at zero, grows in amplitude, and eventually drops to zero. There are two types of waves: standing and moving. Standing waves are waves that don't move away from where they start until they reach **their peak amplitude**. Moving waves are waves that travel across space. Raindrops are an example of a moving wave.

Standing waves can be created in water or sand by placing an object such as a rock in the middle of the pond or river and then watching how the water moves around it. The reason we use rocks to create **standing waves** is because if we put something more fluid like water into a container, it would spread out from the point where the rock was placed in the center and there would be no ring pattern. With sand, we could use something similar to a rock but instead of a piece of stone, we use something smaller such as a shell or even a ball of play-dough. Moving waves are waves that travel through space rather than along a path such as a road or river. Wind blows objects such as leaves or paper boats forward which are examples of moving waves.

Waves are one of the most important things in oceanography because they help us understand different sea states and what kinds of forces are working on underwater rocks and reefs.