the.com/waveform
the shape a sound signs its name with before it hits your ears.
means a graph of how a signal's amplitude changes over time, the visual fingerprint of any oscillating thing.
from emerged with 19th-century wave physics and oscilloscopes, which let engineers finally see what vibration and electricity were doing instant by instant.
sine puritya pure sine wave has zero harmonic content, ever
square rootssquare waves are infinite stacked odd harmonics, mathematically
visual dnaevery instrument's timbre is basically its waveform's signature