Page 40 - Master Handbook of Acoustics

FIGURE 1-13 A comparison of basic waveforms and noise. (A) The spectral energy of a pure
sinusoid is contained entirely at a single frequency. The triangular (B) and square (C) waveforms
each have a prominent fundamental and numerous harmonics at integral multiples of the fundamental
frequency. (D) Random noise (white noise) has energy distributed uniformly throughout the spectrum