DOLBY-NR

D olby- N oise R eduction system invented by Ray Dolby. There are various levels of quality, which in rank order from lowest to highest quality include Dolby B (good), Dolby C (better), Dolby S (best), and Dolby SR (professional). DSB Dolby surround digital systems are even higher quality systems used in movie soundtracks and videodiscs. HDTV will also include DSD. A sound enforcement system first used in the movie THX 1138 by George Lucas is now known as the THX system. The THX-licensed speakers use a professional Dolby process for commercial and home theater systems. (See also HX-Pro )