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Additional Information
2Dolby Digital compatible media and playback
methods
Marks indicating Dolby Digital compatibility: .
The following are general examples. Also refer to the
player’s operating instructions.
Media
DVD
1
Others
(satellite broadcasts,
CATV, etc.)
Dolby Digital output
terminals
Optical or coaxial
digital output
(same as for PCM)
1
Optical or coaxial
digital output
(same as for PCM)
Playback method
(reference page)
Set the input mode to
“AUTO” ( page
45).
Set the input mode to
“AUTO” ( page
45).
1: Some DVD digital outputs have the function of
switching the Dolby Digital signal output method
between “bit stream” and “(convert to) PCM”. When
playing in Dolby Digital surround on the AVR-4806,
switch the DVD player’s output mode to “bit stream”.
In some cases players are equipped with both “bit
stream + PCM” and “PCM only” digital outputs. In this
case connect the “bit stream + PCM” terminals to the
AVR-4806.
wDolby Pro Logic II
Dolby Pro Logic II is a new multi-channel playback format
developed by Dolby Laboratories using feedback logic
steering technology and offering improvements over
conventional Dolby Pro Logic circuits.
Dolby Pro Logic II can be used to decode not only sources
recorded in Dolby Surround ( ) but also regular stereo
sources into five channels (front left, front right, center,
surround left and surround right) to achieve surround
sound.
Whereas with conventional Dolby Pro Logic the surround
channel playback frequency band was limited, Dolby Pro
Logic II offers a wider band range (20 Hz to 20 kHz or
greater). In addition, the surround channels were monaural
(the surround left and right channels were the same) with
previous Dolby Pro Logic, but Dolby Pro Logic II they are
played as stereo signals.
•Various parameters can be set according to the type of
source and the contents, so it is possible to achieve
optimum decoding ( page 56).
eDolby Pro Logic IIx
Dolby Pro Logic IIx furthers the matrix decoding technology
of Dolby Pro Logic II to decode audio signals recorded on
two channels into up to 7.1 playback channels, including
the surround back channel. Dolby Pro Logic IIx also allows
5.1-channel sources to be played in up to 7.1 channels.
The mode can be selected according to the source. The
Music mode is best suited for playing music, the Cinema
mode for playing movies, and the Game mode for playing
games. The Game mode can only be used with 2-channel
audio sources.
Sources recorded in Dolby Surround
These are sources in which three or more channels of
surround have been recorded as two channels of
signals using Dolby Surround encoding technology.
Dolby Surround is used for the sound tracks of movies
recorded on DVDs, LDs and video cassettes to be
played on stereo VCRs, as well as for the stereo
broadcast signals of FM radio, TV, satellite broadcasts
and cable TV.
Decoding these signals with Dolby Pro Logic makes it
possible to achieve multi-channel surround playback.
The signals can also be played on ordinary stereo
equipment, in which case they provide normal stereo
sound.
There are two types of DVD Dolby Surround recording
signals.
q2-channel PCM stereo signals
w2-channel Dolby Digital signals
2Sources recorded in Dolby Surround are
indicated with the logo mark shown below
Dolby Surround support mark:
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic”, “Surround EX” and the double-D
symbol are trademarks of Dolby Laboratories.
rDolby Headphone
This is a three-dimensional sound technology developed
jointly by Dolby Laboratories and Lake Technology Ltd. of
Australia for achieving surround sound using regular
headphones.
•Previously, when using headphones all the sounds
resonated inside the head and it was uncomfortable to
listen with headphones for long periods of time. Dolby
Headphone simulates speaker playback in a room and
places the sound at the front or the sides, outside the
head, to achieve a powerful sound like the sound of movie
or home theaters. This technology is mainly for
multichannel audio/video equipment with Dolby Digital or
Dolby Pro Logic Surround decoding functions and works
with a high performance digital signal processing (DSP)
chip.
Dolby Headphone is effective not only for multichannel
sources but also for stereo programs.
On the AVR-4806, it is possible to output signals encoded
in the Dolby Headphone mode from the recording output
terminal and record them on a separate recorder.
136


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