DP564 Multichannel Audio Decoder Operating Modes
6-2
Mono can only be activated when one of the two-channel downmixes is in use, or
when the input is PCM or a 2/0 Dolby Digital program. We recommend that program
mixers designate Lo/Ro as the source for mono downmixes. A mono output of the
Lt/Rt mix is possible, however.
Both Lo/Ro and Lt/Rt output to the Left and Right channels. If you apply Pro Logic
decoding, the decoded output is sent to Left, Right, Center, and a single Surround
channel output, which is then sent to both the Ls and Rs outputs to feed both
Surround speakers, as described in Section 6.1.2, Decoding. Mono outputs to the
Center channel only.
6.1.2 Decoding Your Decoding selections depend on the settings selected in the Monitor
Control setup menu. When the setting in the Pro Logic menu is Auto,
application of Pro Logic is controlled by metadata in a Dolby Digital input stream, as
described in Section 4.4.2, Monitor Control. The application of Dolby Digital
Surround EX™ decoding is also controlled by metadata if the Surround EX setting
is Auto. When these decoding modes are set to automatic detection, the light on the
associated front-panel button is lit when that decoding mode is active.
When those menus are set to Manual, you can select these decoding modes using the
front-panel buttons. Pro Logic and Pro Logic II are available only when processing a
two-channel signal, or when a Dolby Digital multichannel signal is downmixed to
two channels.
Pro Logic is best used to decode a signal encoded in Dolby Surround (Lt/Rt) to Left,
Center, Right, and a single Surround channel output, which is then sent to both the Ls
and Rs outputs to feed both Surround speakers. It can be used on an Lo/Ro signal to
hear the effect of feeding a stereo signal into a Pro Logic decoder.
Pro Logic II applies the selected mode in the Pro Logic II setup menu. Pro Logic
II generates discrete signals for the Left and Right Surround channels from any
signal. It enhances the decoding of a signal encoded in Dolby Surround (Lt/Rt)
beyond the capability of the original Pro Logic. In addition, Pro Logic II is
particularly well-suited to decoding an Lo/Ro signal into a multichannel listening
environment. For more information on the modes and controls available using Pro
Logic II, see Pro Logic II in Section 4.4.2, Monitor Control.
EX applies Surround EX decoding to any Dolby Digital input with two surround-
channel signals. EX cannot be activated unless two surround-channel signals are
present in the input and your monitor setup includes at least one Back Surround
speaker.