High Quality Content by WIKIPEDIA articles! A triangle wave is a non-sinusoidal waveform named for its triangular shape. Like a square wave, the triangle wave contains only odd harmonics. However, the higher harmonics roll off much faster than in a square wave (proportional to the inverse square of the harmonic number as opposed to just the inverse). It is possible to approximate a triangle wave with additive synthesis by adding odd harmonics of the fundamental, multiplying every (4n?1)th harmonic by ?1 (or changing its phase by ?), and rolling off the harmonics by the inverse square of their relative frequency to the fundamental.

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