Charter Communications Is Announcing A New Requirement For All Cable Viewing Customers. The Company Has Undergone A Digital Upgrade That Now Requires Every Television In A Home To Have A Set-Top Box To Be Able To Decode The New All-Digital Signals. The Change Goes Into Effect Next Month. The Upgrade Will Provide Better Picture Quality And Will Allow Internet Speeds To Be Doubled From 30 To 60 Megabits Per Second. Charter Is Giving A Grace Period To Customers. After That Each Digital Decoder Box Will Cost $6.99 A Month.