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Creating Realistic Sound Fields
You can use the following surround modes to reproduce a realistic sound field.
• Digital Multichannel Surround —Dolby Digital and DTS Digital Surround
• Dolby Pro Logic II
Dolby Digital and DTS Digital Surround
To enjoy surround effectively, all the speakers need to be connected and activated.
Dolby Digital
Used to reproduce multichannel sound tracks of the software encoded with Dolby Digital ( ).
Dolby Digital encoding method (discrete 5.1 channel digital audio format)records and digitally compresses the left front
channel,right front channel,center channel,left rear channel,right rear channel,and Subwoofer channel signals (total 6 channels,but
the Sub channel is counted as channel 0.1).
In addition,Dolby Digital enables stereo rear sounds,and sets the cutoff frequency of the rear treble at 20 kHz,compared to 7 kHz
for Dolby Pro Logic.These facts result in better sound quality than Dolby Pro Logic.
When the system detects Dolby Digital signals,the DOLBY DIGITAL indicator lights up on the display.
DTS Digital Surround
Used to reproduce multichannel sound tracks of the software encoded with DTS Digital Surround ( ).
DTS Digital Surround is another discrete 5.1 channel digital audio format available on CD,LD,and DVD software.
Compared to Dolby Digital,audio compression rate is relatively low.
This fact allows DTS Digital Surround format to add breadth and depth to the reproduced sounds.As a result,DTS Digital
Surround features natural,solid and clear sound.
When the system detects DTS Digital Surround signals, the DTS indicator lights up on the display.
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.
In addition, the surround channels were monaural (the surround left and right channels were the same) with previous
Dolby Pro Logic, but with Dolby Pro Logic II they are stereo.
* 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.
Manufactured under license from Dolby Laboratories. “Dolby,”
“Pro Logic,” and the double-D symbol are trademarks of Dolby
Laboratories. Confidential Unpublished Works. ©1992–1997
Dolby Laboratories, Inc. All rights reserved.
Manufactured under license from Digital Theater Systems, Inc.
US Pat. No. 5,451,942 and other world-wide patents issued
and pending. “DTS” and “DTS Digital Surround” are
trademarks of Digital Theater Systems, Inc. ©1996 Digital
Theater Systems, Inc. All rights reserved.