A string excitation model for audio synthesis of bowed string instruments

An excitation model describes how the bow drives the oscillation of the string when moved across it. The string model describes the resonance of the string and usually includes a backfeed loop. The simplest string model is that of Karplus and Strong which consists of a feedback delay line with an order-2 lowpass. More complex string models take the two transverse oscillation modes of a string and their interaction at the bridge and at the bow into account. Body resonance models range from reverberation filters to physical models of the instrument body.