It's not mentioned by name on this page but the HDTV standard in question bears little resemblance to any in use today. Hi-Vision (hence the Hi-) was an analog 1125-line HD standard. There were MUSE high definition LaserDiscs full a decade before anyone was buying Blu-Ray or HD-DVD, and this game was a public method to promote the standard.
More reading:
http://en.wikipedia.org/wiki/Multiple_sub-Nyquist_sampling_e...
http://ura.caldc.com/stannum/hivision.html
http://www.laserdiscarchive.co.uk/laserdisc_archive/muse_hig...