Traveling Waves

A traveling wave is any kind of wave that propagates in a single direction with negligible change in shape.

A delayline (pure delay) can model wave propagation with a fixed waveshape in 1-D.

Transverse and longitudinal waves³ in a vibrating string are nearly perfect traveling waves.

Plane waves are a class of traveling wave that dominate in cylindrical bores (bore of clarinet, cylindrical tube segments in trumpet).

Spherical waves take the place of plane waves in conical tubes. Because they travel like plane waves, they are still modeled with a delay line.