context: Early HDTV commercial experiments, such as NHK's MUSE, required over four times the bandwidth of a standard-definition broadcast. Despite efforts made to reduce analog HDTV to about twice the bandwidth of SDTV, these television formats were still distributable only by satellite.
question: ఏ విధమైన ప్రయోగాలు SDTV ప్రసారం బ్యాండ్ తో నాలుగు సార్లు అవసరం?
answers: Early HDTV commercial experiments