A
triangle wave is a
waveform that can be obtained by
subtractive synthesis by
integrating a
square wave[?]. Like a square wave, it contains only odd
harmonics. However, the higher harmonics roll off faster than in a square wave, and so its
sound is smoother than a square wave and and nearer to the sound of a
sinewave[?]. But a little more metallic.
You can approximate a triangle wave by additive synthesis, by adding odd harmonics of the fundamental, rolling them off with frequency faster than with a square wave. The infinite series will converge to a triangle wave.
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