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
... density is 943.4/km² (2,444.3/mi²). There are 5,418 housing units at an average density of 300.6/km² (778.8/mi²). The racial makeup of the town is ...