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OPERATION 43
ENGLISH
Selecting a Digital Source
To utilize either digital mode you must have
properly connected a digital source to the AVR.
Connect the digital outputs from DVD players,
HDTV receivers, satellite systems or CD players to
the Optical or Coaxial inputs on the rear or
front panel
UV
. In order to provide a
backup signal and a source for analog stereo
recording, the analog outputs provided on digital
source equipment should also be connected to
their appropriate inputs on the AVR rear panel
(e.g., connect the analog stereo audio output
from a DVD to the DVD Audio inputs
5
on
the rear panel when you connect the source’s
digital outputs).
To select a digital source such as DVD, first select
its input using the remote or front panel Input
Selector
4
%
as outlined in this manual in
order to feed its video signal (if any) to the TV
monitor and to provide its analog audio signal
for recording. When the digital input associated
with the input selected (e.g. “DVD”) is not
selected automatically (due to the input settings
made earlier during the system configuration, see
page 23), select the digital source by pressing
the Digital Input Selector button
G
Û
and
then using the
/
¤
buttons
E
on the remote
or the Selector buttons
7$
on the front
panel to
choose any of the
OPTICAL
or
COAXIAL inputs, as they appear in the
Upper Display Line
˜
or on-screen display.
When the digital source is playing, the AVR will
automatically detect whether it is a multichannel
Dolby Digital or DTS source, MP3 or conventional
PCM signal, which is the standard output from
CD players.
Note that a digital input (e.g. coaxial) remains
associated with any analog input (e.g. DVD) as
soon as it is selected, thus the digital input need
not be re-selected each time the appropriate
input choice (e.g. DVD) is made.
Digital Bitstream Indicators
When a digital source is playing, the AVR senses
the type of bitstream data that is present. Using
this information, the correct surround mode will
automatically be selected. For example, DTS bit-
streams will cause the unit to switch to DTS
decoding, and Dolby Digital bitstreams will enable
Dolby Digital decoding. When the unit senses
PCM data, from CDs and LDs and some music
DVDs or certain tracks on normal DVDs, it will
allow the appropriate surround mode to be
selected manually. Since the range of available
surround modes depends on the type of digital
data that is present, the AVR uses a variety of
indicators to let you know what type of signal is
present. This will help you to understand the
choice of modes and the input channels recorded
on the disc.
When a digital source is playing, the AVR will
display a variety of messages to indicate the type
of bitstream received. These messages will
appear shortly after an input or surround mode is
changed, and will remain in the Main Infor-
mation Display
˜
for about five seconds
before the display returns to the normal surround
mode indication.
For Dolby Digital and DTS sources, a three digit
indication will appear, showing the number of
channels present in the data. An example of this
type of display is 3/2/.1.
The first number indicates how many discrete
front channel signals are present.
A 3 tells you that separate front left, center
and front right signals are available. This will be
displayed for Dolby Digital 5.1 and DTS 5.1
programs.
A 2 tells you that separate front left and right
signals are available, but there is no discrete
center channel signal. This will be displayed for
Dolby Digital bit streams that have stereo
program material.
A 1 tells you that there is only a mono channel
available in the Dolby Digital bitstream.
The middle number indicates how many discrete
surround channel signals are present.
A "3" tells you that separate, discrete left
surround, center surround and right surround
signals are present. This is available only on
discs with DTS-ES digital audio.
A 2 tells you that separate surround left and
right signals are available. This will be
displayed for Dolby Digital 5.1 and DTS 5.1
programs.
A 1 tells you that there is only a single,
surround encoded surround channel. This will
appear for Dolby Digital bit streams that have
matrix encoding.
A 0 indicates that there is no surround channel
information. This will be displayed for two-
channel stereo programs.
The last number indicates if there is a discrete
Low Frequency Effects (LFE) channel. This is the
“.1” in the common abbreviation of “5.1” sound
and it is a special channel that contains only bass
frequencies.
A .1 tells you that an LFE channel is present.
This will be displayed for Dolby Digital 5.1 and
DTS 5.1 programs, as available.
A 0 indicates that there is no LFE channel
information available. However, even when
there is no dedicated LFE channel, low fre-
quency sound will be present at the subwoofer
output when the speaker configuration is set to
show the presence of subwoofer.
The information in the right side of the display
will tell you if the digital audio data contains a
special flag signal that will automatically
activate the appropriate 6.1 or 7.1 mode. This
will be shown as EX-ON or EX-OFF for Dolby
Digital bitstreams and ES-ON or ES-OFF for
DTS bitstreams.
When Dolby Digital 3/2/.1 or DTS 3/2/.1 signals
are being played, the AVR will automatically
switch to the proper surround mode, and no
other processing may be selected. When a Dolby
Digital signal with a 3/1/0 or 2/0/0 signal is
detected you may select any of the Dolby
surround modes.
It is always a good idea to check the readout for
the channel data to make certain that it matches
the audio logo information shown on the back of
a DVD package. In some cases you will see
indication for “2/0/0” even when the disc
contains a full 5.1, or 3/2/.1 signal. When this
happens, check the audio output settings for
your DVD player or the audio menu selections for
the specific disc being played to make certain
that the player is sending the correct signal to
the AVR.
USB Playback
The AVR 645 is among the very few A/V receivers
capable of direct connection to a computer for
audio playback. Once the AVR is connected,
audio streams and playback are possible through
your AVR, with all the power and performance of
the high-current amplifier, your own speakers,
and the enhanced multichannel playback made
possible through the use of Logic 7, Dolby Pro
Logic II/IIx or DTS Neo:6 processing.
The AVR’s USB connectivity may be used with
PC-compatible computers running either
Microsoft
®
Windows
®
2000 with Service Pack 4
or higher installed, or Windows XP
®
or Windows
XP Media Center Edition with Service Pack 1 or
higher installed. Connect one of the available
USB jacks on your computer or a USB hub to the
USB Jack
H
on the AVR using a cable with a
standard USB plug on one side and a USB “Mini
B” plug on the other side.
Operation
29851_AVR645_ENG 30/10/06 9:46 Side 43
43


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