Inbroadcasting,sound multiplex is a method to deliver alternative audio feeds on television and radio channels.

This way, a television or radio channel can carrysurround sound (likestereo or5.1 surround sound), or alternative audio programming where an audio track in different language, alternative sports commentary, oraudio description for people withvisual impairment can be heard.

This sectionis missing information about standard(s) for digital terrestrial TV, and another for satellite television. Please expand the section to include this information. Further details may exist on thetalk page.(September 2018)

Analogue television

• EIAJ MTS, a standard developed byElectronic Industries Association of Japan (EIAJ) in Japan
• Multichannel television sound (MTS), a standard developed in the United States, and adopted in Argentina, Brazil, Canada, Chile, Mexico, Philippines, Taiwan and United States
  • Second audio program (SAP), part of MTS
• Near Instantaneous Companded Audio Multiplex (NICAM), a standard developed in the United Kingdom, and adopted in major European and Asia-Pacific countries
• Zweikanalton (a.k.a. A2 Stereo), a standard developed in Germany, and mainly adopted in Australia, Austria, Germany, Netherlands, South Korea and Switzerland

Analogue radio

• Subsidiary communications authority (SCA), a standard developed in the United States, and also adopted in Canada
  • FMeXtra, a digital application of SCA
• HD Radio, a proprietary digital standard also established and used in the U.S. and Canada

• Pollack, Andrew (16 June 1984)."Japan's stereo TV system".The New York Times. Retrieved19 September 2018.

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