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Second audio program
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. 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.
==Usage==
SAP is often used to provide audio tracks in languages other than the native language included in the program (as a result, the facetious term "Spanish audio program" is used as an expansion to the acronym), or for the Descriptive Video Service (DVS) offered in the United States on some television stations or cable networks (primarily ABC, CBS, NBC, and PBS), along with broadcasting the local NOAA Weather Radio services or a local National Public Radio station (on many PBS stations) at times where translation or DVS is not needed. SAP is used for broadcasting the Canadian Parliamentary television channel CPAC in both English and French. SAP is also used for student radio stations that cannot otherwise get on the air due to crowded FM broadcasting bands.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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