In facsimile, a frequency modulationsystem where one frequency represents picture black and another frequency represents picture white[?]. Frequencies between these two limits may represent shades of gray
An intentional frequency change used for modulation purposes
... 5,316 households, and 4,454 families residing in the town. The population density is 943.4/km² (2,444.3/mi²). There are 5,418 housing units at an averag ...