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: How much more bandwith was required from early HDTV commercial experiments than an SD broadcast?
Answer: over four times

Question: Efforts were made to reduce analog HDTV to how much of the bandwith of SDTV?
Answer: about twice

Question: Despite the reduced bandwith, HDTV format still had to be distributed how?
Answer: by satellite

Question: What kind of experiments required over four times the bandwith of a SDTV broadcast?
Answer: Early HDTV commercial experiments

Question: How much more bandwith was required from early SDTV commercial experiments than an SD broadcast?
Answer: Unanswerable

Question: Efforts were made to reduce analog SDTV to how much of the bandwith of SDTV?
Answer: Unanswerable

Question: Despite the reduced bandwith, SDTV format still had to be distributed how?
Answer: Unanswerable

Question: What kind of experiments required over five times the bandwith of a SDTV broadcast?
Answer: Unanswerable