Method for Training a Speaker to Phonate at a Given Fundamental Frequency
Martin F. Schwartz · The Journal of the Acoustical Society of America · 1965
A subject can be trained aurally to phonate at a given fundamental frequency by having him zero-beat his fundamental frequency against a reference tone. If the reference tone is presented through a loudspeaker, a sound-level meter can be adjusted to respond to the beats and thereby provide the speaker with a visual indication of his performance. The addition of visual information appears to facilitate the training procedure.