Digital waveguide model of a rigidly terminated ideal string

• One polarization-plane of transverse vibration
• Traveling-wave components $\isdef$ displacement samples
• Diagram for velocity and acceleration waves identical
  (all have inverting reflection at each rigid termination)
  (slope and force waves reflect with no sign inversion)
• Output signal $y(nT,\xi)$ formed by summing traveling-wave components at the desired ``virtual pickup'' location (position $x=\xi$ )