Augmenting the Acoustic Piano with Electromagnetic String Actuation and Continuous Key Position Sensing

Andrew McPherson, and Youngmoo Kim

Proceedings of the International Conference on New Interfaces for Musical Expression

Abstract:

This paper presents the magnetic resonator piano, an augmented instrument enhancing the capabilities of the acoustic grand piano. Electromagnetic actuators induce the stringsto vibration, allowing each note to be continuously controlled in amplitude, frequency, and timbre without external loudspeakers. Feedback from a single pickup on thepiano soundboard allows the actuator waveforms to remainlocked in phase with the natural motion of each string. Wealso present an augmented piano keyboard which reportsthe continuous position of every key. Time and spatial resolution are sufficient to capture detailed data about keypress, release, pretouch, aftertouch, and other extended gestures. The system, which is designed with cost and setupconstraints in mind, seeks to give pianists continuous control over the musical sound of their instrument. The instrument has been used in concert performances, with theelectronically-actuated sounds blending with acoustic instruments naturally and without amplification.

Citation:

Andrew McPherson, and Youngmoo Kim. 2010. Augmenting the Acoustic Piano with Electromagnetic String Actuation and Continuous Key Position Sensing. Proceedings of the International Conference on New Interfaces for Musical Expression. DOI: 10.5281/zenodo.1177849

BibTeX Entry:

  @inproceedings{McPherson2010,
 abstract = {This paper presents the magnetic resonator piano, an augmented instrument enhancing the capabilities of the acoustic grand piano. Electromagnetic actuators induce the stringsto vibration, allowing each note to be continuously controlled in amplitude, frequency, and timbre without external loudspeakers. Feedback from a single pickup on thepiano soundboard allows the actuator waveforms to remainlocked in phase with the natural motion of each string. Wealso present an augmented piano keyboard which reportsthe continuous position of every key. Time and spatial resolution are sufficient to capture detailed data about keypress, release, pretouch, aftertouch, and other extended gestures. The system, which is designed with cost and setupconstraints in mind, seeks to give pianists continuous control over the musical sound of their instrument. The instrument has been used in concert performances, with theelectronically-actuated sounds blending with acoustic instruments naturally and without amplification.},
 address = {Sydney, Australia},
 author = {McPherson, Andrew and Kim, Youngmoo},
 booktitle = {Proceedings of the International Conference on New Interfaces for Musical Expression},
 doi = {10.5281/zenodo.1177849},
 issn = {2220-4806},
 keywords = {Augmented instruments, piano, interfaces, electromagnetic actuation, gesture measurement},
 pages = {217--222},
 title = {Augmenting the Acoustic Piano with Electromagnetic String Actuation and Continuous Key Position Sensing},
 url = {http://www.nime.org/proceedings/2010/nime2010_217.pdf},
 year = {2010}
}