System to reproduce the sound of a stringed instrument

A system to reproduce the sound of a stringed instrument having hammers that strike strings, the system comprising:

• a speed detection means coupled with each hammer to detect a percussion velocity on the string,
• a plurality of note modules, equal to a number of hammers, receiving an input signal representative of a hammer velocity and generating a force signal (Ftot) representative of all partial components of a string vibration, and
• a soundboard-instrument body module receiving in input said force signal (Ftot) from each note module and generating two electrical signals (left, right) adapted to power two electroacoustic transducers for sound emission;
• wherein each note module of said plurality of note modules comprises:
• a hammer module receiving in input the hammer velocity signal and generating a force signal (Fh) reproducing an evolution across time of a force with which the hammer strikes the strings when playing “fortissimo” dynamics and a resonance impulse signal (Fh,res) reproducing an evolution across time of a force transmitted to the strings by the hammer when playing the “fortissimo” dynamics, both the force signal (Fh) and the impulse resonance signal (Fh,res) being a function of a hammer impact velocity;
• a primary and longitudinal resonator module receiving in input said force signal (Fh) from the hammer module and generating a force signal (Fprim+quad) representative of a linear and quadratic primary component of the string vibration and a force signal (Flong) representative of a longitudinal component of the string vibration;
• a secondary resonator module receiving in input said force signal (Fh) from the hammer module and an active note module (Fc) obtained from a sum of said resonance impulse signals (Fh,res) and from a sum of the force signals of primary and quadratic component (Fprim+quad) and generating a force signal (Fsec) representative of a secondary component of the string vibration;
• and
• a duplex resonator module receiving in input said force signal (Fc, duplex) obtained from a sum of said resonance impulse signals (Fh, res) and generating a force signal (Fduplex) representative of a duplex oscillatory component of the string vibration;
• said force signal of the primary component (Fprim), a force signal of a longitudinal component (Flong), the force signal of the secondary component (Fsec) and the force signal of duplex component (Fduplex) being summed in each note module in such manner to obtain said signal of the partial components (Ftot) to be sent to said soundboard-instrument body module of the instrument.