The Logical Choice

Dolby circuits come in many flavours. Dolby B, C and S noise-reduction systems take the hiss out of cassette and videotapes. Dolby HX headroom-expansion systems increase the treble in cassette recordings while Dolby Digital 5.1 multi-channel is what you hear at the movies or when you play DVDs on a home-theatre system. Ray Dolby established Dolby Laboratories in the 1960s with the original Dolby A professional compander and his latest achievement is Dolby ProLogic II, a circuit that converts the two-channel