JVC SP-THM45C - Manual (Page 30)

27
English
Creating realistic sound fields
You can use the following surround modes to reproduce a realistic
sound field.
• Dolby Surround
• Dolby Pro Logic II
• Dolby Digital
• DTS Digital Surround
• DSP modes
• DAP modes
• All Channel Stereo
7 Dolby Surround
Dolby Pro Logic II*
Dolby Pro Logic II has a newly developed multichannel playback
format to decode all 2 channel sources — stereo source and Dolby
Surround encoded source — into a 5.1 channel.
The matrix-based encoding/decoding method used by Dolby Pro
Logic II makes no limitation for the cutoff frequency of the treble
from surround channel and enables stereo surround sound
compared to conventional Dolby Pro Logic.
Dolby Pro Logic II enables to reproduce spacious sound from
original sound without adding any new sounds and tonal coloration.
Dolby Pro Logic II has two modes — Movie mode and Music
mode:
• Pro Logic II Movie (PL II MOVIE)
Suitable for reproduction of Dolby Surround encoded sources
bearing the mark
. You can enjoy soundfield very
close to the one created with discrete 5.1 channel sounds.
• Pro Logic II Music (PL II MUSIC)
Suitable for reproduction of any 2 channel stereo music sources.
You can enjoy wide and deep sound by using this mode.
• When Dolby Pro Logic II is activated, the
GPLII indicator
lights on the display window.
Dolby Digital*
Used to reproduce multichannel soundtracks of the software
encoded with Dolby Digital (
).
Dolby Digital 5.1 ch (DOLBY D) encoding method (so-called
discrete multichannel digital audio format) records and digitally
compresses the front left channel, front right channel, center
channel, surround left channel, surround right channel and LFE
channel signals.
Since each channel is completely independent from the other
channel signals to avoid interference, you can obtain much better
sound quality with much stereo and surround effects.
NOTE
• Dolby Digital software can be roughly grouped into two categories-
multichannel (up to “5.1” channel) and 2 channel software. To enjoy
surround sounds while playing Dolby Digital 2 ch software, you can
use Dolby Pro Logic II.
7 DTS Digital Surround
**
Used to reproduce multichannel soundtracks of the software
encoded with DTS Digital Surround (
).
DTS Digital Surround (DTS) is another discrete multichannel
digital audio format available on CD, LD and DVD software.
Compared to Dolby Digital, audio compression ratio 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.
7 DSP modes
DAP (Digital Acoustic Processor) modes
DAP modes have been designed to create important acoustic
surround elements.
The sound heard in a live club, dance club, hall or pavilion consists
of direct sound and indirect sound — early reflections and
reflections from behind. Direct sounds reach the listener directly
without any reflection. On the other hand, indirect sounds are
delayed by the distances of the ceiling and walls (see the diagram
below).
These indirect sounds are important elements of the acoustic
surround effects. The DAP mode can reproduce a realistic sound
field by adding these indirect sounds.
The following DAP modes are provided with this system.
These DAP modes can be used to add the acoustic surround effects
while reproducing 2 channel stereo source, and can give you a real
“being there” feeling.
• When one of the DAP modes is selected, the DSP indicator lights
on the display window.
LIVE CLUB
Gives the feeling of a live music club with a
low ceiling.
DANCE CLUB Gives a throbbing bass beat.
HALL
Gives clear vocal and the feeling of a concert
hall.
PAVILION
Gives the spacious feeling of a pavilion with a
high ceiling.
* Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
** “DTS” and “DTS Digital Surround” are registered
trademarks of Digital Theater Systems, Inc.
TH-M45[A].book Page 27 Thursday, June 5, 2003 11:20 AM