television emerged digital television 's roots tied closely availability inexpensive high performance computers digital television became possible digital television previously practically possible due impractically high bandwidth requirements uncompressed digital video ref name lea ref ref name barbero ref requiring around mbit standard definition television sdtv signal ref name lea gbit high definition television hdtv ref name barbero digital television became practically possible early due major technological development discrete cosine transform dct video compression ref name lea ref name barbero dct coding lossy compression technique
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