This means that any inharmonic effects of the string are reduced by bowing, which is not the case when the string is plucked. When this happens the motion of the string is nearly exactly periodic, and it therefore makes a sound with an almost exactly harmonic spectrum. Over a limited range of pressure applied by the player, the cycle of stick and slip is governed by the standing wave in the string. The bow string interaction is important for another aspect. This involves some interesting properties of friction, the force that makes things difficult to slide. The action of the bow which drives the strings is a regular cycle of stick-slip-stick-slip. This affects the timbre, too: after a pluck, the high harmonics fade away quickly, leaving only the fundamental and some weak lower harmonics, while bowing maintains the rich harmonic spectrum. The bow allows the player to continuously input energy and so to maintain a note.
Using this technique, adding new elements and performing an unceasing fine-tuning, we have built the best modeled Bowed Strings virtual instruments on the market, allowing the real-time control of bow speed, bow pressure, bow position, vibrato, portamento, harmonics, tremolo, pizzicato, and many other parameters in a realistic way, almost indistinguishable from the real instrument.
We have performed an in-depth study of the Physical Modeling techniques, especially the Digital Waveguides Synthesis by prof. SWAM-S stands for Synchronous Waves Acoustic Modeling – Strings.ĭifferently from SWAM, sound is generated by pure Physical Modeling, so there are no samples at all.
0 kommentar(er)
