4.1

Chapter 4 Advanced adjustments 27
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Surround EX Mode: When using a 5.1 (L R C LFE Ls Rs), 5.0 (L R C Ls Rs), 4.1 (L R LFE Ls Rs), or 4.0
(L R Ls Rs) layout, this property tells the playback device whether the audio has been encoded
in Dolby Digital Surround EX. There are three menu options:
•
Not Indicated: Does not send the playback device information about whether the bitstream
was encoded in Dolby Digital Surround EX.
•
Not Encoded: Tells the playback device that the bitstream was not encoded in Dolby Digital
Surround EX.
•
Surround Encoded: Tells the playback device that the bitstream was encoded in Dolby Digital
Surround EX.
•
Stereo downmix: Use this pop-up menu to set how to downmix a surround signal to a stereo
signal. For more information, see About audio channels on page 67.
Important: The LFE signal may be discarded by the Dolby Digital downmix process.
•
Lo/Ro center, Lo/Ro surround, Lt/Rt center, Lt/Rt surround (for surround sound output): Use
these pop-up menus to set the decibel level at which the surround and center channels are
downmixed. Properties are enabled or disabled based on the channel layout you choose.
•
DRC line mode: Use this pop-up menu to set the dynamic range compression processing mode.
The default setting, Film Standard, is recommended for all use cases.
•
DRC RF mode: Use this pop-up menu to set the dynamic range compression processing mode
for RF (TV sets, cable set top boxes, or other devices that have RF connections).
•
LFE low-pass lter: Select this checkbox to apply a 120 Hz low-pass lter to the low-frequency
eects (LFE) channel during output.
•
DC lter: Select this checkbox to apply a DC (direct current) high-pass lter to all input
channels. Although this lter provides a simple way to remove DC osets, note that most
mixed audio material is already free of DC osets.
•
Surround channels: 90 phase-shift: This property, which applies a 90-degree phase shift to the
surround channels, is selected by default. The shift in phase decorrelates the front and back
channels and prevents the L and Ls signals from canceling each other out if a surround-
compatible downmix is later applied to the decoded signal.
•
Surround channels: 3dB attenuation: Select this checkbox to apply a 3 dB cut to the surround
channels during output. This option is intended for multichannel output (like a lm
soundtrack) that is being transferred to a consumer home theater format. Cinema surround
channels are mixed 3 dB “hot” (higher) relative to the front channels to account for cinema
amplier gains.
•
Dialog normalization: Enter a value in the eld to set the loudness of the program in your
sound les relative to full modulation. The playback device uses this information to maintain
similar loudness among dierent AC-3 streams. The goal is to give all AC-3–encoded audio les
the same listening level, regardless of the source le.
Audio eects
For a list of available audio eects and instructions on how to add an audio eect to a setting,
see Add and remove eects on page 76.
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