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...hich was especially useful in the early days of radio (See also [[interval signal]]). In some cases, including ''[[The Brady Bunch]]'', ''[[Gilligan's Island

...c affairs and [[E/I|educational programming]] that only aired on the local signal. By the early 2000s, TBS had begun to focus more intensively on comedic pro ...munications Commission]] had only approved the Atlanta station's broadcast signal to be carried on cable and satellite providers domestically across Canada,

...acrovision uses a process called "colorstriping," which inverts the analog signal's colorburst period and causes off-color bands to appear in the picture. Le The erase head is fed by a high level, high frequency AC signal that overwrites any previous recording on the tape.<ref>[http://hyperphysic

...lete when UK television changed to a [[625-line television system|625-line signal]] in preparation for the soon-to-begin colour transmissions.</ref> [[wiping ...n "The Time of the Doctor" (2013) where speaking his true name becomes the signal by which the Time Lords would know they can safely return to the universe,