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{{Short description|Method to deliver alternative audio feeds in television and radio}}
In [[broadcasting]], '''sound multiplex''' is a method to deliver alternative audio feeds on television and radio channels.
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This way, a television or radio channel can carry [[surround sound]] (like [[Stereophonic sound|stereo]] or [[5.1 surround sound]]), or alternative audio programming where an audio track in different language, alternative sports commentary, or [[audio description]] for people with [[visual impairment]] can be heard.
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** [[Second audio program]] (SAP), part of MTS
* [[NICAM|Near Instantaneous Companded Audio Multiplex]] (NICAM), a standard developed in the United Kingdom, and adopted in major European and Asia-Pacific countries
* [[Zweikanalton]] ({{aka}} A2 Stereo), a standard developed in Germany, and mainly adopted in Australia, Austria, Germany, Serbia, Croatia, Netherlands, South Korea and Switzerland
;Analogue radio
* [[Subsidiary communications authority]] (SCA), a standard developed in the United States, and also adopted in Canada
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