Cisco D9054 Installation And Operation Manual page 199

Setting Up the Linear Audio Program,
5. Select the audio Language Type.
This is a language descriptor which, besides the audio language above, indicates
which type of audio you transfer:
Undefined
Clean Effects
Hearing Impaired
Visually Impaired
6. Click Apply.
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Language Type
D9054 HDTV Encoder Intstallation and Operation Guide
Continued
Undefined. Used widely for the main program
sound
Expressly having no language, i.e. the sound track
without any speech.
For program speech without music and effects.
Background noise is reduced so that only one
primary sound source is perceived.
Used for audio description. Audio description is an
ancillary component associated with a TV service
which delivers a verbal description of the visual
scene as an aid to understanding and enjoyment for
e.g. viewers who have visual impairments.
Meaning
5-115