Operation
3/2.1: This message appears
when a full complement of Dolby
Digital signals is present: 3 front
channels (left, center and right),
2 surround channels (surround
left and surround right) and “1”
channel, which is the dedicated Low
Frequency Effects (LFE) channel.
3/1: This message indicates the
AC-3 system is decoding a standard
Dolby Pro Logic signal with left,
center and right front channels and
a signal mono surround channel.
2/0: This message indicates that
the AC-3 system is decoding a tradi-
tional two-channel stereo signal and
that no center, surround or LFE
signals are present.
1+1: This is a monaural signal
that plays the same information in
both the left front and right front
speakers. There is no sound sent to
the center or surround speakers.
1/0: This is a monaural signal
that plays through the center channel
speaker only. There is no sound at the
front left/right or surround speakers.
Night Mode
A special feature of Dolby Digital is the
Night mode, which enables AC-3 input
sources to be played back with their full
range while reducing the minimum peak
level by 1/4 to 1/3. This prevents abruptly
loud transitions from causing distur-
bances without reducing the impact of
the digital source. The Night mode is
available only when AC-3 signals with
special data are being played.
To engage the Night mode, press the
Night buttonj on the remote and
note that the NIGHT indicator K will
illuminate in the Information Display.
IMPORTANT NOTES ON
DOLBY DIGITAL PLAYBACK:
1. When the digital playback unit is in a
pause, fast forward or chapter search
mode the digital audio data may
momentarily stop, causing a NO
DATA message to be displayed. This is
normal and does not indicate a problem
with either the AVR45 or the source
machine. The AVR45 will return to Dolby
Digital/AC-3 playback as soon as the data
is available when the machine is in a
standard play mode.
2. The AVR45 will decode digital audio
sources with a sampling frequency of
32kHz, 44.1kHz and 48kHz. Although
this will enable it to decode virtually all
DVD movies and HDTV sources, it is pos-
sible that some future digital sources
may not be compatible with the AVR45.
NOTE: In order to play the Dolby Digital
signals that are recorded on laser discs,
you must have both a laser disc player
with an RF output, and an optional,
outboard RF-to-data demodulator. To
listen to Dolby Digital LV discs, connect
the AC-3/RF output of the player to the
demodulator, and connect the output
of the demodulator to the Coaxial or
Optical inputs °·on the rear panel
of the AVR45. DO NOT connect the
AC-3/RF output of a laser disc player
directly to the AVR45.
3. Note that not all programs recorded in
Dolby Digital contain full 5.1 channel
audio. Consult the program guide that
accompanies the DVD or laser disc to
determine which type of audio has been
recorded on the disc. The AVR45 will
automatically sense the type of digital
surrround encoding used on an AC-3
program source and adjust to
accommodate it.
4. When a Dolby Digital source is
playing, you may not select any of the
analog surround modes.
5. It is not possible to record the output
of a Dolby Digital program.
PCM Audio Playback
PCM (Pulse Code Modulation) is the
non-compressed digital audio system
used for compact discs and non-AC-3
laser discs. The digital circuits in the
AVR45 are capable of high-quality digital-
to-analog decoding, and they may be
connected directly to the digital audio
output of your CD or LV player.
Connections should be made to the
AC-3/PCM Optical or Coaxial inputs
°·on the rear panel, using whichever
input is not occupied by an AC-3 source
such as a DVD player.
To listen to a PCM digital source, first
select the input for the desired source
(e.g., CD). Next press the Digital button
wˆand then using the
⁄
/
¤
buttons
g on the remote or the Selector
buttons¸ on the front panel until the
desired choice of either COAXIAL or
OPTICAL, as it appears in the Main
Information Display S. Press the Set
button i˜to enter the desired choice.
25
AVR45 om (G).Eng,Fr 4/16/99 11:41 AM Page 25
