Parameter Values Description
Room type
Not indicated, Large room X curve monitor,
Small room flat monitor
Type and calibration of the mixing room used for the final
audio mixing session.
Copyright flag Off, On Indicates if the material is copyright protected
Original bitstream flag Off, On Indicates if source is the original or a copy
Enable extended
bitstream information
Off, On Flags if additional information is available for downmixing.
Preferred downmix
mode
Not indicated, Lt/Rt downmix preferred, Lo/Ro
downmmix preferred
Indicates if the producer would prefer a Lt/Rt or a Lo/Ro
downmix. Can be over-ridden by the decoder.
Lt/Rt center mix level
1.414 (+3.0 dB), 1.189 (+1.5 dB), 1.000 (0 dB),
0.841 (-1.5 dB), 0.707 (-3.0 dB), 0.595 (-4.5 dB),
0.500 (-6.0 dB), 0 (-inf dB)
Indicates the required level reduction of the center channel
when mixed with the L& R channels for a Lt/Rt downmix.
Similar to 'Center mix level'.
Lt/Rt surround mix
level
0.841 (-1.5 dB), 0.707 (-3.0 dB), 0.595 (-4.5 dB),
0.500 (-6.0 dB), 0 (-inf dB)
Indicates the required level reduction of the surround
channels when mixed for a Lt/Rt downmix. Similar to
Surround mix level'.
Lo/Ro center mix level
0.841 (-1.5 dB), 0.707 (-3.0 dB), 0.595 (-4.5 dB),
0.500 (-6.0 dB), 0 (-inf dB)
Indicates the required level reduction of the center channel
when mixed with the L& R channels for a Lo/Ro downmix.
When present this replaces the value set for the 'Center
mix level'
Lo/Ro surround mix
level
0.841 (-1.5 dB), 0.707 (-3.0 dB), 0.595 (-4.5 dB),
0.500 (-6.0 dB), 0 (-inf dB)
Indicates the required level reduction of the center channel
when mixed for Lo/Ro downmix. When present this
replaces the value set for the 'Surround mix level'.
Dolby Surround EX
mode
0.841 (-1.5 dB), 0.707 (-3.0 dB), 0.595 (-4.5 dB),
0.500 (-6.0 dB), 0 (-inf dB)
Flags if the stream has been encoded in 'Surround Ex'.
Only used if surround channels are present.
A/D converter type Standard, HDCD Indicates type of A/D conversion used.
Digital de-emphasis Off, Auto, On
To meet the Dolby Digital encoding algorithm specification
the audio must not have pre-emphasis applied. If the input
signal does have pre-emphasis applied, a de-emphasis
filter must be applied prior to encoding.
DC high pass filter
enable
Off, On
Removing the DC component can lead to more efficient
encoding, but there is a risk that signals that do not reach
100% PCM may exceed this after filtering and therefore
must be clipped.
Bandwidth low-pass
filter enable
Off, On
Remove high frequency signals before encoding. The filter
removes frequencies that would not normally be encoded.
Low-frequency effects
low pass filter enable
Off, On
Apply a 120 Hz low pass filter prior to an encode. Should
only be switched off if it is known that there are no
frequencies above 120 Hz.
Surround attenuation
enable
Off, On
Attenuate surround channels by 3 dB before encoding.
Theatrical and consumer mixing rooms use different levels
for the surround channels, and this can be used to
compensate.
Surround phase shift
enable
Off, On
Apply a phase shift of 90 degrees to the surround
channels. This simplifies the decode process for producing
a 'Lt/Rt' downmix.
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