11.   But other than a translated analog signal, no immediate plans for locally originated HDTV programming.

12.   But some digital signals transmit at higher frequencies than analog signals and are more susceptible to energy loss as they travel between points.

13.   Current cellular services use analog signals, in essence, waves.

14.   Federal law already requires cable operators to carry the analog signals of broadcast stations in their local markets.

15.   For LCD monitors to work with most desktop computers, however, they must convert the incoming analog signal back to digital.

16.   Instead, they are built around networks of simple sensors, switches and mechanical systems that respond to analog signals like lightwaves, heat or sounds.

17.   No such interference was noted with cellular telephones that use conventional analog signals.

18.   Now Hitachi America Ltd. has received a patent for a decoder that can translate digital high-definition or digital standard-definition signals into an analog signal.

19.   Once Americans get programs over digital sets tuned to the new channels, the channels through which the analog signals travel are to go dark.

20.   Once the TV stations complete their transition to digital using a new block of airwaves, the analog signals will be turned off.