ALBERT: a real-time visual feedback computer tool for professional vocal development.

This paper considers the nature of real-time visual feedback for vocal analysis and development and presents a new software tool, called ALBERT (acoustic and laryngeal biofeedback enhancement in real time), designed for use with those developing their voices professionally. This tool embodies several important issues in the provision of real-time visual feedback, including: (a) support for user-configurable visual displays, (b) the ability to use colour as a complementary or sole medium for the presentation of information, (c) the ability to combine algorithmically any number of vocal parameters to create a new single parameter representative of some aspect of vocal measurement which may be displayed and updated in real time, and (d) a rate of information update which may be altered by the user at any point for the most appropriate use according to the context of the feedback task. Several examples of system use are given, including the real-time display of fundamental frequency, jitter, and larynx closed quotient (CQ) parameters in a variety of visual configurations. Several examples are given relating to developing professional voice users, including the derivation of a new parameter which reflects the measure of progress of subjects along a linear correlation line between CQ and the level of energy in the singer's formant region.