IEC 61937-14:2017(E) describes the method to convey non-linear PCM bit streams encoded according to the AC-4 format.
IEC 61937-14 Ed. 1.0 en:2017
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Digital audio – Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 – Part 14: Non-linear PCM bitstreams according to the AC-4 format