Some stations send two audio streams, for example one in English
and one in Spanish.
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One meaning of the abbreviation 'SAP' is Systemanalyse und Programmentwicklung (a German company founded in 1972) which means 'System Analysis and Program Development' in English.
Another meaning is 'Secondary Audio Programming' which was an audio frequency transmitted to televisions to allow other languages be played simultaneously while the original broadcast is playing.
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MTS, or 'multi television sound' is just another acronym for a
stereo receiver plus that of a secondary audio channel (SAP)
decoder built into the TV set. The SAP is usually mono, and is
mostly used for Spanish language programming in the United
States.
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Secondary audio program (most popular being Spanish)
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The website, OpenAL (Open Audio Library) is a cross-platform
audio application programming interface (API). It is designed for
efficient rendering of multichannel three dimensional positional
audio.