Waveform

[3] In electronics, the term is usually applied to time-varying voltages, currents, or electromagnetic fields.

In acoustics, it is usually applied to steady periodic sounds — variations of pressure in air or other media.

In these cases, the waveform is an attribute that is independent of the frequency, amplitude, or phase shift of the signal.

is phase: The Fourier series describes the decomposition of periodic waveforms, such that any periodic waveform can be formed by the sum of a (possibly infinite) set of fundamental and harmonic components.

Finite-energy non-periodic waveforms can be analyzed into sinusoids by the Fourier transform.