Unity amplitude

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A sinusoidal waveform is said to have a unity amplitude when the amplitude of the wave is equal to 1.

x(t) = Asin(wt) where A = 1.

This terminology is most commonly used in Digital Signal Processing and is usually associated with the Fourier series and Fourier Transform sinusoids that involve a duty cycle, ɑ, and a defined fundamental period, T_o.