Active Control of a Vibrating String
Websites for related conference papers:
Some stringed instruments that I modified/made for the project:
Alpha version: practice installing piezoelectric sensors
Beta version: configuration allowing collocated control of horizontal and
Version 1.0: can be used for performances
Sample sounds produced using version one, which has only one string:
For each example, an effect from the Eventide
Orville was placed in the feedback loop. A dynamic range limiter was used to
induce stability, and the loop gain was adjusted by hand to control the
intensity of the feedback. Only one axis is being actuated, but both the
horizontal and vertical axes are
|The effect produces
a series of arpeggiated notes based on what it guesses is the fundamental.
|The effect outputs
"clouds" of tonal sound related to the fundamental frequency.
|This effect causes modulations much
like that of a Leslie organ.
demonstrates vibrato with some additional distortion.
|The effect delays the
signal by about 1/4sec and shifts the pitch up by a fourth. Note that the
guitar only has one string.
|This effect plays a scale
up from what it guesses is the fundamental frequency.