line coding type used in Europe and Japan. A very similar encoding scheme, with the logical positions reversed, is also used and is often referred to as pseudoternary encoding. This encoding is otherwise identical. Historical uses B-MAC, and essentially all family members of the Multiplexed Analogue Components Television Transmission family used Duobinary to encode the digital audio, teletext, closed captioning and selective access for distribution. Because of the way Duobinary was coupled to the NICAM like digital audio subsystems for the MAC family, up to 50% of data reduction was possible in both Stereo and Mono transmission modes. At least with some data transmission systems, duobinary can perform lossless data reduction though this has seldom been utilized in practice. See also MLT-3 encoding Polar encoding References Encodings Line codes