Second audio program
Alternate audio channel used in television transmissions / From Wikipedia, the free encyclopedia
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This article is about an American analog television standard which is a part of MTS. For the secondary audio feed on television in general, see Sound multiplex in broadcasting.
Second audio program (SAP), also known as secondary audio programming, is an auxiliary audio channel for analog television that can be broadcast or transmitted both over-the-air and by cable television. Used mostly for audio description or other languages, SAP is part of the multichannel television sound (MTS) standard originally set by the National Television Systems Committee (NTSC) in 1984 in the United States. The NTSC video format and MTS are also used in Canada and Mexico.