Zweikanalton ("two channel sound") is a television sound transmission system used in Germany and other countries. It relies on two separate FM carriers. This offers relatively high separation between the channels (compared to a subcarrier-based multiplex system) and can thus be used for bilingual broadcasts as well as stereo. The abbreviations FM, Fm, and fm may refer to: Electrical engineering Frequency modulation (FM) and its most common applications: FM broadcasting, used primarily to broadcast music and speech at VHF frequencies FM synthesis, a sound-generation technique popularized by early digital synthesizers Science Femtometre (fm), an SI measure of length... A carrier wave, or carrier is a waveform (usually sinusoidal) that is modulated (modified) to represent the information to be transmitted. ... A subcarrier is separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. ... In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ... The term bilingualism (from bi meaning two and lingua meaning language) can refer to rather different phenomena. ... Symbol for stereo Stereophonic sound, commonly called stereo, is the reproduction of sound, using two independent audio channels, through a pair of widely separated speaker systems, in such a way as to create a pleasant and natural impression of sound heard from various directions as in natural hearing. ...

The second FM carrier is transmitted on a frequency 242 kHz higher than the main FM carrier. A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ...

Zweikanalton is known by a variety of names worldwide. Most commonly used names are German Stereo, A2 Stereo, West German Stereo and IGR Stereo.

See also

• Multichannel television sound
• NICAM