A very simple string model

A very simple string model can be implemented using a single delay line and our simple first-order low pass filter $H(z)$ to model frequency-dependent loss.

Figure 14: A very simple model of a rigidly terminated string.

Though losses are distributed along the length of the string, in an LTI system they may be lumped to a single observation point and approximated with $H(z)$.

Different quality string sounds can be created by changing this filter.

This model may be interpreted as a feedback comb filter with lowpassed feedback or a simplified digital waveguide model.

How is this model excited? How is the string plucked?