Xoro HSD 4000 [118/124] Page 118
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Xoro HSD 4000 [118/124] Page 118

Xoro HSD 4000 [118/124] Page 118
GLOSSARY
5.1 developed completely new and is now 100% MPEG-4
5.1-multichannel encoding means, that 5 audichannels
compliant. The new codec os called DivX 4/5 and can
with full frequency response are present (left, center,
be obtained for free at his codec is also
right, surround left, surround right) plus a subwoofer
compatible to videos encoded with the old DivX codec
channel (represented by the „.1”) providing deep
(DivX 3.11). Today, DivX just a brand name for the
humming frequencies you are used to know from
MPEG-4 encoder/player from DivX Networks that lives
® ®
from the fame of early DivX days.
modern cinemas. Both Dolby Digital and DTS
Videos encoded with DivX 4/5 are fully MPEG-4
support 5.1-coding and decoding.
compliant and theoretically can be played on any
CD
MPEG-4 enabled DVD player.
A CD (Compact Disc) is a metal-coated plastic disc. It
®
has a diameter of 12 cm and a thickness of anout 1,2
Dolby Digital 5.1
®
mm. It was developed by Sony and Philips in 1985. The
Dolby Digital 5.1 is a system for transmission and
advantages are digital storage of music enabling very
storage of 5.1 channel sound on digital media as DVD,
natural sound reproduction. Beyond this, the data is
digital TV and sattellite transmission. Different from the
® ®
stored more compact, the handling is easy. The long
codecs Dolby Surround and Pro Logic who do not
lifetime of the media and the fact that usage does not
work with channel separation to encode the surround
®
decrease quality made the CD the ideal storage media.
sound in a stereo recording, Dolby Digital is a discrete
In the meantime, 12 different storage media have been
system where the different audio channels keep
developed from the first CD. The mostly used are CD-
completely separated during encoding and decoding.
DA (Compact Disc - Digital Audio) , CD-ROM (Compact
Dolby Digital 5.1 is industry standard for coding of DVD
Disc - Read Only Memory), and the DVD (Digitale
movies with surround sound.
Versatile Disc).
One can store about 74 to 80 minutes of music on a CD
DSP
(-DA). This is equal to 650 to 700 MB
Digital Signal Processor. Microprocessor for digital
Signal transmission is performed touchless with a laser
processing of signals. Virtual Surround for example is
beam. The CD is being read from the middle to the outer
created with a DSP.
side. The data or music is recorded in a spiral from the
®
middle to the outer side.
DTS
® ®
A CD has pits and lands, the distance is about 1,6 mm.
DTS is a coding standard similar to Dolby Digital . DTS
®
The laser light created by a laser diode passes different
Digital Surround is a multichannel surround system
®
mirrors and prisms and then is focused by a lens to a
from Digital Theater Systems. Similar to Dolby Digital it
laser beam. This laser beam scans the data spiral of the
uses up to 5.1 channels. Different from Dolby, the data
CD. On the pits, the laser beam is reflected in another
rate can be far above 1 Mbit/sec so the sound is not
®
direction and is detected by a photocell. The photocell
compresses as strong as in Dolby Digital resulting in a
transmits the signal to a microprocessor which converts
higher sound quality.
the digital data to an audio signal. The rest is done by
The frequency range is from 20Hz to 20kHz at 20Bit, but
the sound system.
the subwoofer channels only transmits frequencies
below 80Hz. The coding system also is called CAC.
CVBS
Composite Video Interface. The video signal is
DVD
The DVD (Digital Versatile Disk) was introduced in
transmitted via a single signal line. CVBS should only
1995 and is a storage media with a large capacity.
be used, if your playback device does not offer other
While a standard CD can store 650 MB of data, the DVD
interfaces for connection with you Xoro TV set, as
can store up to 9 GB. Especially when it comes to video
CVBS due to technical reasons delivers worst quality
playback, a large storage capacity is important. Beyond
of all available interfaces (please also refer to YUV,
its high capacity, the consumer enjoys high quality video
S-Video, SCART and RGB). The CVBS interface can
and audio. A DVD can store up to 8 different
easily be identified from the yellow color of the RCA
audiostreams, so in best case, the movie can be
jack.
watched in 8 different languages.
TM
DivX
TM
Photo-CD (JPEG CD)
DivX is a new high quality video codec which is based
A Photo-Cd is a storage system for image storage on a
on MPEG-4 standard and combined with MP3 audio.
CD-ROM in a platform independent multi resolution
Originally, the DivX-Codec was a Microsoft codec
structure (support of different resolutions and file
(MPEG-4 v3). The official codec only used ASF format
formats, e.g. JPEG, BMP, etc). As a single camera film
(no AVI) or WMV format with Windows Media Encoder
dies not fill a complete CD, more films can be added to
7. The official codec had a bitrate limit which was
the CD at a later time. A CD-ROM drive must be
removed on DivX.
multisession enabled to load images from a Photo-CD.
On the next stage of development, the codec was
www.divx.com. T
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