Frequency and Time Analysis of Polyphonic Music
P.A. Tove, Lars Ejdesjö, Anders Svärdström · The Journal of the Acoustical Society of America · 1967
Apparatus has been constructed to give a two-dimensional diagram with a three dimensional representation of frequency, time position, and amplitudes of tones in polyphonic music. The apparatus consists of a frequency analyzer with constant relative bandwidth and sliding frequency setting, combined with a repeating (loop) tape recorder and an XY recorder with an auxiliary pen-deflecting mechanism for small, fast deflections. Examples of analyzed music are shown demonstrating the advantages of this method, which gives at a glance a survey showing frequency, time position, and amplitude, and thus offers objective notation and analysis of music.