From 1956–1959, the Baltimore Colts, Pittsburgh Steelers and Philadelphia Eagles only had away games telecasts on CBS. When these three played at home, there was no need for the usage of split audio. Instead, the away teams telecasts were produced in a simple audio/video single feed. In fact, in 1959, 1960, and 1961, NBC had the rights to show home games of the Colts and Steelers. While games were blacked-out (as per NFL policy) in those cities, they were available to other NBC affiliates.