Rotel RSP-1066 Owner's Manual download pdf (Page 15)

Surround Formats

To get best performance from your RSP-1066,

it helps to understand the many surround sound

formats available today, to know which de-

coding process to use for a particular record-

ing, and how to select it. This section provides

basic background information about surround

sound formats. The next sections provide de-

tailed operating instructions.

Dolby Surround

Dolby Pro Logic

The most widely available surround sound

format for consumer audio/video is Dolby

Surround

, available on nearly all commer-

cial VHS tapes, many television broadcasts,

and most DVDs. Dolby Surround is the con-

sumer version of the analog Dolby Stereo system

first introduced in the film industry in 1972. It

is a matrix-encoding system that records front

left, front center, front right, and a mono sur-

round channel into a 2-channel stereo record-

ing. During playback, a Dolby Pro Logic

de-

coder extracts each channel and distributes

it to the appropriate speakers.

Dolby Pro Logic decoding delivers a mono sig-

nal with reduced high-frequency content to the

surround speakers. The more advanced de-

coder in the RSP-1066, Dolby Pro Logic II, in-

creases the separation and frequency response

of the surround channels for significantly im-

proved performance with Dolby Surround en-

coded recordings.

Dolby Pro Logic II decoding is used for any

analog soundtrack or recording labeled “Dolby

Surround” or any Dolby Digital 2.0 soundtrack.

While it is specifically designed to decode

Dolby Surround recordings, Dolby Pro Logic

can derive surround sound from conventional

2-channel stereo recordings, using phase re-

lationships to extract front, right, center, and

surround channels.

Activate Dolby Pro Logic II decoding with the

Dolby PLII/3ST button described in the next

section of the manual.

Dolby Digital

In 1992, an entirely new digital recording

system, called Dolby Digital, was first used in

the film industry. Dolby Digital is a recording/

playback system that uses compression tech-

niques to store large amounts of audio data

efficiently, much like the JPEG format stores

large photographs in small files on a computer.

Dolby Digital is the standard audio format for

DVDs and for digital television broadcasting

in the United States.

The Dolby Digital system can be used to record

up to six discrete audio channels, but can con

be used for fewer. For example, a Dolby Digital

2.0 recording is a 2-channel stereo record-

ing such as a matrix encoded Dolby Surround

soundtrack. To play this type of recording, use

Dolby Pro Logic II decoding as previously de-

scribed.

The most common use of Dolby Digital, in both

the film industry and in home theater, is Dolby

Digital 5.1. Instead of encoding multiple sur-

round channels on a two-channel recording,

Dolby Digital 5.1 records six discrete chan-

nels: front left, front center, front right, surround

left, surround right, and a Low Frequency Ef-

fects (LFE) channel containing ultra-low bass

signals intended for a subwoofer. A Dolby Digi-

tal decoder extracts the channels from the digital

bitstream, converts them to analog signals and

routes them to the appropriate speakers. All

channels provide full frequency response with

total separation between all channels and large

dynamic range capability. A Dolby Digital 5.1

soundtrack will provide significantly more

impressive surround sound than Dolby Pro Logic

decoding of matrix Dolby Surround.

Decoding of Dolby Digital 5.1 soundtracks is

automatic. When the RSP-1066 detects a Dolby

5.1 signal on one of its digital inputs, it acti-

vates the proper processing. Keep in mind that

Dolby Digital is only available from digital

sources (a DVD, a LaserDisc, or a Digital TV/

Cable/SAT tuner). Also, you must connect the

source with a digital cable (coax or optical)

to an active digital input on the RSP-1066.

NOTE

: Many DVDs have a Dolby Digital 2.0

matrix soundtrack as the default, which should

be decoded with Pro Logic II. The Dolby Digi-

tal 5.1 soundtrack may have to be selected

as an option from the setup menus at the be-

ginning of the DVD. Look for a Dolby Digital

5.1 selection under “Audio” or “Languages”

or “Setup Options” when you insert the disc.

DTS

5.1

DTS

(Digital Theater Systems) is an alterna-

tive digital format competing with Dolby Digital

in both movie theaters and home theater

markets. The basic features and functions of

the DTS system are similar to those of Dolby

Digital (for example, 5.1 discrete channels),

however the technical details of the compres-

sion and decoding processes differ somewhat

and a DTS decoder is required.

Like Dolby Digital, DTS can only be used on

a digital recording and, therefore, is only

available for home use on LaserDiscs, DVDs,

or other digital formats. To use the RSP-1066’s

DTS decoder, you must connect your DVD

player to the RSP-1066’s digital inputs.

As with Dolby Digital 5.1, detection and proper

decoding of DTS 5.1 signals is automatic.

NOTE

: DVDs with a DTS soundtrack almost

always have it configured as an option to the

standard matrix Dolby Surround format. To

use DTS, you may have to go to the setup

menus at the beginning of the DVD and se-

lect “DTS 5.1” instead of “Dolby Surround”

or “Dolby Digital 5.1”. In addition, many DVD

players have the DTS digital bitstream turned

off by default and cannot output a DTS

soundtrack, even if selected on the disc’s

menu, until you activate the player’s DTS out-

put. If you here no sound the first time you

attempt to play a DTS disc, you may have to

go to the DVD player’s configuration menus

and turn on the DTS bitstream. This is a one-

time setting and need only be done once.

See your DVD owners manual for details.

The RSP-1066 features a second type of DTS

surround sound decoding: DTS Neo:6. This

decoding system is similar to Dolby Pro Logic

II in that it is designed for playback of any 2-

channel stereo recording, either matrix-encoded

or not. The Neo:6 decoder can by used with

any conventional 2-channel source such a

stereo TV or FM broadcast or a CD. It can also

be used as an alternative method of decod-

ing matrix-encoded Dolby Surround record-

ings or TV broadcasts. Activate the DTS Neo:6

decoding with the DTS:Neo 6 button as de-

tailed later in this section. DTS Neo:6 is not

used with DTS 5.1 digital sources and the button

need not be pressed for those recordings.

English

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