Marantz SR4500, Service Manual

Page: 6 / 84

4
DTS was introduced in 1994 to provide 5.1 channels of discrete digital
audio into home theater systems.
DTS brings you premium quality discrete multichannel digital sound to
both movies and music.
DTS is a multichannel sound system designed to create full range
digital sound reproduction.
The no compromise DTS digital process sets the standard of quality
for cinema sound by delivering an exact copy of the studio master
recordings to neighborhood and home theaters.
Now, every moviegoer can hear the sound exactly as the
moviemaker intended.
DTS can be enjoyed in the home for either movies or music on of
DVD’s, LD’s, and CD’s.
“DTS” and “DTS Digital Surround” are registered trademarks of
Digital Theater Systems, Inc.
The advantages of discrete multichannel systems over matrix are
well known.
But even in homes equipped for discrete multichannel, there remains a
need for high-quality matrix decoding. This is because of the large library
of matrix surround motion pictures available on disc and on VHS tape;
and analog television broadcasts.
The typical matrix decoder of today derives a center channel and a
mono surround channel from two-channel matrix stereo material. It
is better than a simple matrix in that it includes steering logic to
improve separation, but because of its mono, band-limited surround
it can be disappointing to users accustomed to discrete
multichannel.
Neo:6 offers several important improvements as follow,
• Neo:6 provides up to six full-band channels of matrix decoding
from stereo matrix material. Users with 6.1 and 5.1 systems will
d e r i v e s i x a n d f i v e s e p a r a t e c h a n n e l s , r e s p e c t i v e l y ,
corresponding to the standard home-theater speaker layouts.
• Neo:6 technology allows various sound elements within a channel
or channels to be steered separately, and in a way which follows
naturally from the original presentation.
• Neo:6 offers a music mode to expand stereo nonmatrix recordings into
the five- or six-channel layout, in a way which does not diminish the
subtlety and integrity of the original stereo recording.
DTS-ES Extended Surround is a new multichannel digital signal
format developed by Digital Theater Systems Inc. While offering
high compatibility with the conventional DTS Digital Surround
format, DTS-ES Extended Surround greatly improves the 360-
degree surround impression and space expression thanks to further
expanded surround signals. This format has been used
professionally in movie theaters since 1999.
In addition to the 5.1 surround channels (FL, FR, C, SL, SR and
LFE), DTS-ES Extended Surround also offers the SB (Surround
Back) channel for surround playback with a total of 6.1 channels.
DTS-ES Extended Surround includes two signal formats with
different surround signal recording methods, as DTS-ES Discrete
6.1 and DTS-ES Matrix 6.1.
“DTS”, “DTS-ES” and “Neo:6” are trademarks of Digital Theater
Systems, Inc.
The stereo CD is a 16-bit medium with sampling at 44.1 kHz.
Professional audio has been 20- or 24-bit for some time, and there
is increasing interest in higher sampling rates both for recording and
for delivery into the home. Greater bit depths provide extended
dynamic range. Higher sampling rates allow wider frequency
response and the use of anti-alias and reconstruction filters with
more favorable aural characteristics.
DTS 96/24 allows for 5.1channel sound tracks to be encoded at a
rate of 96kHz/24bits on DVD-Video titles.
When DVD-video appeared, it became possible to deliver 24-bit, 96
kHz audio into the home, but only in two channels, and with serious
limitations on picture. This capability has had little use.
DVD-audio allows 96/24 in six channels, but a new player is needed,
and only analog outputs are provided, necessitating the use of the D/A
converters and analog electronics provided in the player.
DTS 96/24 offers the following:
1. Sound quality transparent to the original 96/24 master.
2. Full backward compatibility with all existing decoders. (Existing
decoders will output a 48 kHz signal)
3. No new player required: DTS 96/24 can be carried on DVD-video,
or in the video zone of DVD-audio, accessible to all DVD players.
4. 96/24 5.1-channel sound with full-quality full-motion video, for
music programs and motion picture soundtracks on DVD-video.
“DTS” and “DTS 96/24” are trademarks of Digital Theater Systems,
Inc.
2. TECHNICAL DESCRIPTION