I want to know the answer to the following question:
When did satellite test broadcasts of Hi-Vision start?
All the background I'm provided with is that "The system, known as Hi-Vision or MUSE after its Multiple sub-Nyquist sampling encoding for encoding the signal, required about twice the bandwidth of the existing NTSC system but provided about four times the resolution (1080i/1125 lines).". Is that enough to answer the question?