Introduction to the Basic Six Audio Tests （页面存档备份，存于互联网档案馆） "Since the sum of the distortion products will always be less than the total signal, the THD+N Ratio will always be a negative decibel value, or a percent value less than 100%."
THD Measurement and Conversion （页面存档备份，存于互联网档案馆） "This number indicates the RMS voltage equivalent of total harmonic distortion power, as a percentage of the total output RMS voltage."
IEEE 519 and other standards (draft （页面存档备份，存于互联网档案馆）): "distortion factor: The ratio of the root-mean-square of the harmonic content to the root-mean-square
value of the fundamental quantity, often expressed as a percent of the fundamental. Also referred to as total harmonic distortion."
THD Measurement and Conversion （页面存档备份，存于互联网档案馆） "This number indicates the RMS voltage equivalent of total harmonic distortion power, as a percentage of the total output RMS voltage."
IEEE 519 and other standards (draft （页面存档备份，存于互联网档案馆）): "distortion factor: The ratio of the root-mean-square of the harmonic content to the root-mean-square
value of the fundamental quantity, often expressed as a percent of the fundamental. Also referred to as total harmonic distortion."
AEMC 605 User Manual （页面存档备份，存于互联网档案馆） "THDf: Total harmonic distortion with respect to the fundamental. THDr: Total harmonic distortion with respect to the true RMS value of the signal."
Introduction to the Basic Six Audio Tests （页面存档备份，存于互联网档案馆） "Since the sum of the distortion products will always be less than the total signal, the THD+N Ratio will always be a negative decibel value, or a percent value less than 100%."
AEMC 605 User Manual （页面存档备份，存于互联网档案馆） "THDf: Total harmonic distortion with respect to the fundamental. THDr: Total harmonic distortion with respect to the true RMS value of the signal."
