One method of generating multiple force pulses as shown in Fig.9.31 is to sum several single-pulse filters, as shown in Fig.9.33. Furthermore, the three input impulses can be generated using a single impulse into a tapped delay line (§2.5). The sum of the three filter outputs gives the desired superposition of three hammer-string force pulses. As the collision velocity increases, the output pulses become taller and thinner, showing less overlap. The filters LPF1-LPF3 can be given as side information, or the input impulse amplitudes can be set to , or the like.