24
Stereoreproduction normally uses left and right speakers, but Digital Theater Systems (DTS), Dolby Digital and Dolby Pro
LogicSurround go further, adding a centre and other channels so you are immersed in sound and special effects.

DigitalTheater Systems (DTS) / Dolby Digital

Both DTS and Dolby Digital split soundtrack information into 6
separatechannelsof soundwhichare outputthrough thespeaker
setup:five full range channels (left, centre, right, stereo left and
rightsurround) and a ’0.1’ (ie: limited range) bass channel. This
givesyou superbsound qualityfromDTS /Dolby Digitalencoded
tracksw hen a compatible speaker system is connected to your
TV.
Mostdialogue comes from the centre channel, which enhances
dialogue and focusesit so it seems to come from the action on
screen.The separate rear left and right channels give a dramatic
senseof space, with sounds travelling in all directions between
front, centre and rear channel speakers (eg: a rocket going
overheadstarts behind you to theleft and explodes in front of you
tothe right). The ’0.1’ Low Frequency Effects(LFE) channel gives
impactto bass sounds and to special effectsmore felt than heard
(eg:the thud of a dinosaur footfall or the rumble of thunder).
WhileDTS and Dolby Digital are both high quality, ’5.1’ channel
surroundsystems, the two systems differ in how they break down
andstore sound information.
They also differ in how they work with existing speaker setups:
DolbyDigital has been developed to be backwardly compatible
withDolby ProLogic andconventionalstereo setups.DTS, onthe
other hand, focuses on the high quality,5.1 channel surround
output; choosing not to develop backward compatibility with
existingsound systems.
Note:
DExternalequipment is usually connected to the TV via one of
the Scart sockets to provide pictures and sound (eg: a VCR
player connected to AV2). Toreceive a DTS or Dolby Digital
encodedsoundtrack from compatible equipment (eg: a DVD
player,a set top box), you will also need to connect an optical
orcoaxial cable to one of the TVs digital audio sockets. See
pages 27 to 28 for connection details, also see the Digital
Audiooption in the SOUND menu, page 9.

Dolby ProLogic

DolbyPro LogicSurrounduses fourchannels ofsound: left,right,
centreand a mono rear channel, giving excellent reproduction of
ProLogic en coded tracks when a compatible speaker system is
connected to your TV. Most dialogue comes from the centre
channel,which enhances dialogue and focuses it so it seems to
come from the action on screen. The rear channel is used to
immerseyou in atmosphere and special effects, the same output
issent to both rear speakers.
Aswith Dolby Digital, Pro Logic is backwardly compatible with a
conventionalstereo speaker setup.
Notes:
DTo get Pro Logic information from Pro Logic encoded TV
programmes, you must be able to receive stereo
transmissions. If stereo transmissions are not transmitted in
yourarea then the Pro Logic informationwill not be present on
TVtransmissions and Pro Logic decoding will only produce a
centrechannel output.
DSeepages 27 to 28 for connection details.
Surround sound systems
Centrespeaker
Centrespeaker
Subwoofer/
LFEspeaker
Rearright
surround
speaker
Rearleft
surround
speaker
Front
right
speaker
Front
left
speaker
Rearright
surround
speaker
Rearleft
surround
speaker
Front
right
speaker
Front
left
speaker