Samsung DSB-S300G Service Manual page 99

Reference Information
14-1-4 Resolution
Resolution refer to the number of pixels on the screen.The higher resolution,the better the visual
quality. Digital broadcasts are classfied into HD and SD grades according to the visual quality.In
general,HD(High Definition) grade supports resolutions of 1920x1080i and 1280x720p and an aspect
radio of 16:9 for both ATSC and DVB standards.
SD(Standard Definition) grade supports resolutions of 720x480p and 720x480i for the ATSC standards,
and supports resolutions of 720x576p and 720x576i for the DVB standard.SD grade usually supports
an aspect radio of 4:3. However,it may differ depending on the region.
14-1-5 DVB
Digital Video Broadcasting(DVB) is a transmission scheme based on the MPEG-2 video compression /
transmission scheme and utilising the standard MPEG-2 Transmission scheme. It is however much
more than a simple replacement for existing analogue television transmission. In the first case, DVB
provides superior picture quality with the opportunity to view pictures in standard format or wide
screen (16:9) format, along with mono, stereo or surround sound.
It also allows a range of new features and services including subtitling, multiple audio tracks,
interactive content, multimedia content - where, for instance, programmes may be linked to world
wide web material.
DVB is a European initiative. Equipment conforming to DVB standard is now in use on six continents
and is DVB rapidly becoming the world-wide standard for digital TV.
At the time DVB was being developed in Europe, a parallel programme of standards and equipment
development was also going-on in the U.S.A. by the Advanced Television Systems Committee (ATSC).
ATSC is slightly different to DVB (obviously the U.S. was not too worried about this - for years they
have lived with an insipid TV standard called NTSC, which has lead to slightly different TV market).
Among other things ATSC adopts a different audio coding standard, and Vestigial Side Band (VSB)
modulation.
The U.S. has adopted a system based on ATSC, called Digital TV (DTV). During standardisation this
evolved into a hot debate between the PC-based manufacturers (favouring a non-interlaced display)
and the TV manufacturers (favouring an interlaced format). There is much in common between the
US and European standards and inter-operation between some DVB and DTV equipment has been
demonstrated.
14-1-6 Dolby Digital 5.1
Dolby Digital 5.1 provides 5 discrete channels of digital audio information for use by A/V receivers
capable of decoding the 5.1 channel signal.
The audio signals are broken into left-front,center,right-front,left-rear,right-rear and a low-frequency
effects channel(designed for subwoofers).
The result when connected to a compatible Dolby Digital 5.1 channel A/V receiver and speaker setup
is a home theater experience that provides much of the dynamic range,360-degree imaging,and sonic
excitement of a real theater.
AC-3 is a sound encoding/decoding technology developed in 1987 for movie theaters and means an
AC-3 bit stream.AC-3 is used synonymously with Dolby Digital nowadays.
14-2 Samsung Electronics