21
ENGLISH
13
DOLBY / DTS SURROUND
Surround
This unit 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.
Dolby Surround
(1) 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.
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”.
(Pages 19, 20)
Set the input mode to “AUTO”.
(Pages 19, 20)
Set the input mode to “AUTO”.
(Pages 19, 20)
1
Use a commercially available adapter to connect Dolby Digital RF (AC-3RF) output signals to the digital input terminals.
(Refer to the adapter’s operating instructions.)
Please refer to the instruction manual of the adapter when making connection.
2
To play in Dolby Digital Surround on the ADV-1000, set “DVD setting change” – “Audio setting” – “Digital output” to
“Normal” in the setup. (The factory default is “Normal”.)
(2) 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 pages 23, 24).
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
Regardless of the signal being played, when the 2-channel decode mode is set to the “Pro Logic
II
” mode in the “AUTO
DECODE” mode, the surround mode is automatically set to “Dolby Pro Logic
II
”.
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.
