Surround mix level
0.707 (-3.0 dB), 0.500 (-6.0 dB), 0 (-inf dB). Surround downmix level for the
front left and right channels when consumer has no surround speakers.
Dolby Surround mode
Not Indicated, Not Encoded, Encoded. Flags if a two channel encoded stream
contains information for a Dolby Pro-logic decode (Lt/Rt).
Audio production information exists
Off, On. This indicates whether the Mixing Level and Room Type parameters
exist within the bit-stream.
Mixing Level
80 to 111 dB. Indicates the acoustic sound pressure level of the dialogue level
during the final audio mixing session.
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.
Mix level type
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.
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