95
Additional Information Additional Information
ENGLISH
ENGLISH
The AVR-4306 is equipped with a digital signal processing circuit
that lets you play program sources in the surround mode to
achieve the same sense of presence as in a movie theater.
[1] Dolby Surround
q Dolby Digital
Dolby Digital is the multi-channel digital signal format
developed by Dolby Laboratories.
Dolby Digital consists of up to “5.1” channels - front left,
front right, center, surround left, surround right, and an
additional channel exclusively reserved for additional deep
bass sound effects (the Low Frequency Effects – LFE –
channel, also called the “.1” channel, containing bass
frequencies of up to 120 Hz).
Unlike the analog Dolby Pro Logic format, Dolby Digital’s
main channels can all contain full range sound information,
from the lowest bass, up to the highest frequencies – 22
kHz. The signals within each channel are distinct from the
others, allowing pinpoint sound imaging, and Dolby Digital
offers tremendous dynamic range from the most powerful
sound effects to the quietest, softest sounds, free from
noise and distortion.
2 Dolby Digital and Dolby Pro Logic
Comparison of home
surround systems
No. recorded channels
(elements)
No. playback channels
Playback channels
(max.)
Audio processing
High frequency
playback limit of
surround channel
Dolby Digital
5.1 ch
5.1 ch
L, R, C, SL, SR, SW
Digital discrete
processing Dolby
Digital encoding/
decoding
20 kHz
Dolby Pro Logic
2 ch
4 ch
L, R, C, S
(SW - recommended)
Analog matrix
processing Dolby
Surround
7 kHz
Surround
2 Dolby 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
27).
Set the input mode to
“AUTO”
(
page
27).
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-4306, 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-4306.
w Dolby Pro LogicII
• Dolby Pro LogicII 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 LogicII 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
LogicII 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 LogicII 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 33).
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.
q 2-channel PCM stereo signals
w 2-channel Dolby Digital signals
2 Sources 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” and the double-D symbol are
trademarks of Dolby Laboratories.
e Dolby Pro LogicIIx
• Dolby Pro LogicIIx furthers the matrix decoding technology
of Dolby Pro LogicII to decode audio signals recorded on two
channels into up to 7.1 playback channels, including the
surround back channel. Dolby Pro LogicIIx 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.
