Amplitude

Amplitude (A)

Maximum magnitude or strength of a signal, usually measured from its mean or zero level.

Types

Peak ( $A_{p}$ ): maximum deviation from mean level.
Peak-to-Peak ( $A_{p p}$ ): difference between maximum and minimum deviations from mean level.
Root-Mean-Square ( $A_{r m s}$ ): effective value of a continuous periodic signal.

A_{r m s} = \sqrt{\frac{1}{T} \int_{0}^{T} [f (t)]^{2} d t}

Unit	Equation
Decibel	$dB = 20 \log_{10} \frac{A}{A_{r e f}}$