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
... and 17.9% are non-families. 13.4% of all households are made up of individuals and 5.5% have someone living alone who is 65 years of age or older. The averag ...