Frequency Vibrato as a Factor in the Loudness and Quality of Musical Tones
Paul B. Oncley · The Journal of the Acoustical Society of America · 1951
The importance of the vibrato in musical tones has been emphasized in many studies by Seashore and others. This paper demonstrates theoretically the intricate overtone structure produced by the frequency modulation of a complex wave, and endeavors to explain the subjectively observed dependence of loudness and quality on such modulation. Some conjectural points are raised regarding certain musical devices such as “tone clusters,” “chorus effect,” etc.