Despite the apparent eagerness of consumer electronics manufacturers to bring out new, improved, and much cheaper high-definition television equipment, the situation behind the scenes is anything but rosy. Satellite services are coming on board with the new format at an encouraging rate, but cable companies, who deliver most of the television signals to most American viewers, have been dragging their feet for years. Reluctance to adapt digital transmission because of its bandwidth demands has hindered the rollout of the new system by as much as five years, according to some estimates.