Appendix #4   Audio Configuration and Narrative Description Track Language
The first two characters denote the soundtrack configuration:
51 = 5.1      61 = 6.1      71 = 7.1  (Verify channel configuration with content provider.)      10 = 1.0  (LtRt Mono)      20 = 2.0  (LtRt Stereo)
Many DCPs now contain supplementary tracks for hearing impaired patrons, or / and supplementary narrative description tracks for vision impaired patrons.  The presence of these tracks should be indicated in the Audio Type field as follows:
51-HI = 5.1 audio with a supplemental Hearing Impaired track.      51-VI = 5.1 audio with a supplemental Vision Impaired Narrative Description track.      51-HI-VI = 51 audio with both Hearing Impaired and Vision Impaired Narrative Description tracks.
It is important to note that there is no longer a specific language indicated in the Audio Type field for the HI or VI tracks, since most often this language will be the same as the language indicated earlier in the naming string in the Audio Language field.
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