Hum Components: The residual artifact harmonics of the AC power supply. In the U.S. the use a 60-Hz system, places the most annoying 2nd and 3rd harmonics at 120 Hz and 180 Hz. For Europe, and other parts of the world using 50-Hz mains, these components fall at 100 Hz and 150Hz. To some extent, this is present with nearly all non automotive sound systems and is generally accounted as noise.

 

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Hum Components: The residual artifact harmonics of the AC power supply. In the U.S. the use a 60-Hz system, places the most annoying 2nd and 3rd harmonics at 120 Hz and 180 Hz. For Europe, and other parts o . . . View Full Definition

Humors: (alias bodily humors) In ancient Greece, Hippocrates postulated that four bodily humors or liquids existed in the body corresponding to the four elements existing in matter. These four liqui . . . View Full Definition

Humus: The dark portion of a soil that consists of organic material that is well enough decayed that the original source material can not be identified.

Kechumaran: A family of non-Indo-European languages spoken in the Andes of South America.