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ENGLISH
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 (AC-3)
encoding/decoding
20 kHz
Dolby Pro Logic
2 ch
4 ch
L, R, C, S (SW - recommended)
Analog matrix processing Dolby
Surround
7 kHz
2 Dolby Digital compatible media and playback methods
Marks indicating Dolby Digital compatibility: and .
The following are general examples. Also refer to the player’s operating instructions.
Media
LD (VDP)
DVD
Others
(satellite broadcasts, CATV, etc.)
Dolby Digital output jacks
Coaxial Dolby Digital RF output jack
1
Optical or coaxial digital output
(same as for PCM)
2
Optical or coaxial digital output
(same as for PCM)
Playback method (reference page)
Set the input mode to “AUTO”.
(Page 23)
Set the input mode to “AUTO”.
(Page 23)
Set the input mode to “AUTO”.
(Page 23)
1 Please use a commercially available adapter when connecting the Dolby Digital RF (AC-3RF) output jack
of the LD player to the digital input jack.
Please refer to the instruction manual of the adapter when making connection.
2 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 AVC-
A11SR, 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”
jacks to the AVC-A11SR.
Surround
The AVC-A11SR 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 Surround AC-3)
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.
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are trademarks of Dolby Laboratories.
Confidential unpublished works, ©1992-1999 Dolby Laboratories. All rights reserved.
w Dolby 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 (see page 31).
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
When either of these signals is input to the AVC-A11SR, the surround mode is automatically set to
Dolby Pro Logic
II when the “DOLBY/DTS SURROUND” mode is selected.
2 Sources recorded in Dolby Surround are indicated with the logo mark shown below.
Dolby Surround support mark:
(2) DTS Digital Surround
DTS Digital Surround (also called simply DTS) is a multi-channel digital signal format developed by Digital
Theater Systems.
DTS offers the same “5.1” playback channels as Dolby Digital (front left, front right and center, surround left
and surround right) as well as the stereo 2-channel mode. The signals for the different channels are fully
independent, eliminating the risk of deterioration of sound quality due to interference between signals,
crosstalk, etc.
DTS features a relatively higher bit rate as compared to Dolby Digital (1234 kbps for CDs and LDs, 1536 kbps
for DVDs) so it operates with a relatively low compression rate. Because of this the amount of data is great,
and when DTS playback is used in movie theaters, a separate CD-ROM synchronized with the film is played.
With LDs and DVDs, there is of course no need for an extra disc; the pictures and sound can be recorded
simultaneously on the same disc, so the discs can be handled in the same way as discs with other formats.
There are also music CDs recorded in DTS. These CDs include 5.1-channel surround signals (compared to
two channels on current CDs). They do not include picture data, but they offer surround playback on CD
players that are equipped with digital outputs (PCM type digital output required).
DTS surround track playback offers the same intricate, grand sound as in a movie theater, right in your own
listening room.
2 DTS compatible media and playback methods
Marks indicating DTS compatibility: and .
The following are general examples. Also refer to the player’s operating instructions.
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