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Dolby® Encoding and Monitoring
Confidence Monitoring
The LA-5300 includes a Dolby AC-4 decoder for confidence monitoring. Monitor audio is routed to the channels
immediately following those used for the bitstream output. For example, if the AC-4 bitstream occupies output
channels 1 and 2 and the confidence decoder's channel mode is 5.1, the monitor audio would be present on output
channels 3 through 8.
Bear in mind that the controls in the Monitor menu only affect the monitor outputs and not actual bitstream
output delivered to downstream facilities or viewers.
Channel Mode
The Channel Mode control (7-4-B) sets the channel mode, including 5.1- and 5.1.2-channel surround formats
and stereo downmixes in Lo/Ro, Lt/Rt, PLII Lt/Rt, or Headphone.
Target Reference Level
The Target Reference Level control (7-4A) is used to emulate how consumer-side decoders scale the audio. For
example, -31dBFS represents Line Mode, whereas -16 or -18dBFS would be useful for mobile-optimized streams.
DRC Enable
Setting the Enable DRC control (7-4C) to "On" applies the DRC calculated by the encoder to the decoded signal.
Dialogue Enhancement Gain
To aid in dialogue intelligibility, the AC-4 codec allows signals that are either flagged with metadata as dialogue or
determined to be dialogue by signal analysis to be boosted by the consumer. The Dialogue Enhancement Gain
control (7-4E) sets the amount by which dialogue is boosted (or cut).
Dialogue Enhancement Preserve Loudness
When dialogue gain is boosted or cut with the Dialogue Enhancement Gain control, the overall loudness will
change compared to the desired target output level. Enabling the Dialogue Enhancement Preserve Loudness
control (7-4D) will compensate for this and ensure the overall level matches the loudness target.
Chapter 7 | 37
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