Grass-valley iTX System v.2.6 Manual de usuario descargar pdf (Pagina 202)

Configuring the audio output for a playout channel

Source audio content may be presented to iTX in a number of different forms; for example,

embedded in a video file or live video signal, or in a separate audio file.

To enable iTX to play out this content, you need to configure settings that relate to a particular

property of the content: the encoded-data format. This may be PCM, Dolby D or Dolby E; it

determines what type of audio codec iTX needs to process the content.

See later in this section, “Encoded-data formats for playout”.

About audio channels and tracks (and streams)

In explaining the audio configuration options, we make the following distinction between audio

channels and tracks.

• By channel, we generally mean the distribution path for a single audio signal or data-

stream component. So, for instance, the left and right signals of a PCM stereo pair

require two channels; likewise, the two parts of a Dolby D data stream.

• Channel may also mean the route along which audio content is carried to a speaker.

For example, the decoding of 2 channels of Dolby D data may provide content for 5.1

surround-sound channels or a pair of stereo channels.

• A track contains one or more channels, of a specific type, and provides complete

independent audio content for an associated video stream. For example, a PCM mono

track contains just one channel; a PCM stereo track, two channels; a Dolby D track,

two channels.

• Sometimes, the word stream is used instead of track.

This illustration shows the output of 2 data (D) channels in a Dolby D track from 6 mono (M)

channels in a PCM track:

PCM track

6 mono (M) channels

Dolby D track

2 data (D) channels

iTX

Audio

Processor

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Grass-valley iTX System v.2.6 Manual de usuario Pagina 202