S-PDIF
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The term "S-PDIF" is an acronym for "Sony-Phillips Digital Interface Format" and is sometimes written as "SPDIF."
In order to address the need for a standardized connection to carry stereo linear PCM digital audio between pieces of equipment, SONY/Phillips adopted a version of the professional AES digital audio interface standard for consumer use. As technology progressed, the connection was adapted for alternative formats employing data compression for multi-channel audio formats for video (DTS and AC-3).