Operating the Equipment Locally: Audio Menu – Dolby Digital (AC-3)
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Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder
ST.RE.E10137.3
Software Release Option
This option indicates the software version of this audio encoder channel. It
is for status only and cannot be changed.
4.7.3
Audio (Dolby Digital (AC-3) Menu)
Source Option
This option defines the audio source.
Table 4.61: Source Options
Selected Option
Description
Off
No audio packets are sent in the transport stream and audio is removed from the SI.
Mute Audio
silence.
Test Tone
An internally generated test tone is used as the audio source. The bit-rate automatically changes
to 96 kbit/s.
Analogue
Analogue audio input on AUDIO IN connector.
Digital
Digital audio input on AUDIO IN connector.
SDI Embedded 1
Digital audio de-embedded from digital video input using DID 0x2FF (SD), 0x2E7 (HD)
SDI Embedded 2
Digital audio de-embedded from digital video input using DID 0x2FF (SD), 0x2E7 (HD)
SDI Embedded 3
Digital audio de-embedded from digital video input using DID 0x1FD (SD), 0x1E6 (HD)
SDI Embedded 4
Digital audio de-embedded from digital video input using DID 0x1FD (SD), 0x1E6 (HD)
Coding Standard Option
This option controls the audio coding standard. The options available in the
audio menu are dependent on the coding standard selected.
Table 4.62: Coding Standard Options
Selected Option
Description
MPEG Layer 2
MPEG Layer 2 audio coding standard.
AC-3 Pass-Thru
Pre-encoded (in Dolby Encoder) AC-3 audio coding standard. See Annex F, Audio Modes, for
information when using this mode.
Dolby E Pass-Thru
Dolby E audio coding standard (pre-encoded in Dolby Encoder). See Annex F, Audio Modes, for
information when using this mode.
Dolby Digital (AC-3)
Dolby Digital (AC-3) audio coding standard.
DTS Pass-Thru
Pre-encoded DTS audio coding standard. See Annex F, Audio Modes, for information when
using this mode.
Linear PCM (Direct)
Linear PCM audio coding standard. See Annex F, Audio Modes, for information.
Linear PCM (Via SRC)
When selected, the audio passes through the sample rate converter before encoding. As a
consequence, any user data bits in the incoming digital audio stream are lost. Audio passes
through the SRC for all input sources i.e. Embedded, Digital, Analogue (though not really
relevant for analogue).
Audio Alignment
Setting this to Aligned ensures each PES packet contains an integral
number of audio frames (which is required by some set-top boxes).