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Dolby® Encoding and Monitoring
Previous LFE Filter
"Applied" indicates LFE filtering has already been applied upstream and will not be added here. "Not Applied"
indicates the filtering has not been applied upstream and will be added by the encoder. "Unknown" should be
selected in situations where it is not known whether or not filtering has been applied.
Previous Phase 90 Filter
"Applied" indicates a 90-degree phase shift has already been applied to the surround channels upstream and will
not be added here. "Not Applied" indicates the phase shift has not been applied upstream and will be added by
the encoder. "Unknown" should be selected in situations where it is not known whether or not the phase shift has
been applied.
Previous Surround Attenuation
"Applied" indicates surround attenuation has already been applied upstream and will not be added here. "Not Ap-
plied" indicates surround attenuation has not been applied upstream and will be added by the encoder. "Unknown"
should be selected in situations where it is not known whether or not surround attenuation has been applied.
Previous Mix Type (2 channel)
If the downmix type is known and present in the incoming metadata stream, set this control to "Auto" to pass the
metadata through to the decoder. Choose "Unknown" in situations where the previous mix type is not known.
Choosing "Mix Down Lo/Ro", "Mix Down PL", or "Mix Down PLII" will force the decoder to use the specified
mix type.
Previous Mix Type (5 channel)
5-channel content may have been initially downmixed from a higher channel count or upmixed from a lower
channel count. If this information is known and present in the incoming metadata stream, set this control to
"Auto" to pass the metadata through to the decoder. Choose "Unknown" if the previous mix type is not known.
Selecting "Mix Down PLIIx", "Mix Down PLIIx Movie", "Mix Down PLIIx Music", or "Mix Down PLIIz" will
force the decoder to use the specified mix type for content that has been mixed down from a high channel count.
Choosing "Mix Up PL", "Mix Up PLII Movie", "Mix Up PLII Music", or "Mix Up PLII Professional" will force the
decoder to use the specified mix type for content that has been upmixed from a lower channel count.
LFE Monitor Level
LFE signals are typically boosted by 10dB during the encoding process to ensure effects in the LFE channel are
properly presented in the mix and deliver the desired impact. If this boost has already been applied upstream,
select "Original Level" in the LFE Monitor Level control (7-2F). If it has not been applied upstream, select
"Boost +10dB". Selecting "Not Indicated" provides no specific information on this parameter to the downstream
decoder.
Dialogue Intelligence
The setting of the Dialogue Intelligence control (7-2E) is automatically set to comply with the specific loudness
regulation selected with the Loudness Practice control. However, it can always be manually enabled and disabled.
Note that as soon as a different Loudness Practice is selected, the Dialogue Intelligence control will reflect the
settings the chosen profile.
Chapter 7 | 35
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