▁one ▁of ▁that ▁continent ' s ▁ind igen ous ▁languages ▁to ▁carry ▁such ▁programming ▁either ▁as ▁primary ▁channel ▁or ▁sub channel ▁affili ations . ▁A ▁few ▁unusual ▁examples ▁of ▁other ▁foreign ▁broad c aster s ▁also ▁exist , ▁such ▁as ▁Greek ▁language ▁W Z RA ▁in ▁Florida ▁and ▁Polish ▁language ▁W P V N - DT 4 ▁in ▁Chicago . ▁ ▁There ▁have ▁also ▁been ▁a ▁few ▁local ▁stations ▁that ▁have ▁broadcast ▁programming ▁in ▁American ▁Sign ▁Language , ▁accompanied ▁by ▁English ▁closed ▁ca ption ing . ▁Prior ▁to ▁the ▁development ▁of ▁closed ▁ca ption ing , ▁it ▁was ▁not ▁un common ▁for ▁some ▁public ▁television ▁programs ▁to ▁incorpor ate ▁AS L ▁transl ations ▁by ▁an ▁on - screen ▁interpreter . ▁An ▁interpreter ▁may ▁still ▁be ▁util ized ▁for ▁the ▁de af ▁and ▁hard - of - he aring ▁community ▁for ▁on - air ▁emer gency ▁broadcast s ▁( such ▁as ▁severe ▁weather ▁alert s ▁given ▁by ▁local ▁govern ments ) ▁as ▁well ▁as ▁tele vised ▁press ▁con ferences ▁by ▁local ▁and ▁state ▁government ▁officials ▁accompanied ▁by ▁closed ▁ca ption ing . ▁ ▁Non - com mer cial ▁television ▁Public ▁television ▁has ▁a ▁far ▁smaller ▁role ▁in ▁the ▁United ▁States ▁than ▁in ▁most ▁other ▁countries . ▁The ▁federal ▁government , ▁through ▁the ▁National ▁Aer onaut ics ▁and ▁Space ▁Administration ▁( N AS A ), ▁does ▁operate ▁NASA ▁TV ▁( a ▁service ▁foc using ▁on ▁the ▁U . S . ▁space ▁program ▁with ▁some ▁educational ▁programming ) ▁for ▁public ▁consumption , ▁but ▁only ▁dist ributes