This paper presents an active bridge allowing for precise audio-rate manipulation of a string’s termination for the purposes of modifying string instrument timbre. The design of the bridge actuator and height sensor is discussed, and the benefits of using feedforward posicast control over a feedback compensator for controlling the dynamics of the severely underdamped bridge actuator system are established.

Authors: Donovan, Liam B.; McPherson, Andrew
Affiliation: Queen Mary University of London, London, UK
AES Convention: 138 (May 2015) Paper Number: 9285
Publication Date: May 6, 2015
Subject: Transducers

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