Xoro HSD 202 — понимание 5.1 многоканального звука и форматов хранения данных [89/92]
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Xoro HSD 202 — понимание 5.1 многоканального звука и форматов хранения данных [89/92]

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Xoro HSD 202 [89/92] English
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GLOSSARY
5.1
CD
CVBS
DivX
Dolby Digital 5.1
DSP
DTS
DVD
Photo-CD (JPEG CD)
5.1-multichannel encoding means, that 5 audichannels
with full frequency response are present (left, center,
right, surround left, surround right) plus a subwoofer
channel (represented by the „.1”) providing deep
humming frequencies you are used to know from
modern cinemas. Both Dolby Digital and DTS
support 5.1-coding and decoding.
A CD (Compact Disc) is a metal-coated plastic disc. It
has a diameter of 12 cm and a thickness of anout 1,2
mm. It was developed by Sony and Philips in 1985. The
advantages are digital storage of music enabling very
natural sound reproduction. Beyond this, the data is
stored more compact, the handling is easy. The long
lifetime of the media and the fact that usage does not
decrease quality made the CD the ideal storage media.
In the meantime, 12 different storage media have been
developed from the first CD. The mostly used are CD-
DA (Compact Disc - DigitalAudio) , CD-ROM (Compact
Disc - Read Only Memory), and the DVD (Digitale
Versatile Disc).
One can store about 74 to 80 minutes of music on a CD
(-DA). This is equal to 650 to 700 MB
Signal transmission is performed touchless with a laser
beam. The CD is being read from the middle to the outer
side. The data or music is recorded in a spiral from the
middle to the outer side.
A CD has pits and lands, the distance is about 1,6 mm.
The laser light created by a laser diode passes different
mirrors and prisms and then is focused by a lens to a
laser beam. This laser beam scans the data spiral of the
CD. On the pits, the laser beam is reflected in another
direction and is detected by a photocell. The photocell
transmits the signal to a microprocessor which converts
the digital data to an audio signal. The rest is done by
the sound system.
Composite Video Interface. The video signal is
transmitted via a single signal line. CVBS should only
be used, if your playback device does not offer other
interfaces for connection with you Xoro TV set, as
CVBS due to technical reasons delivers worst quality
of all available interfaces (please also refer to YUV,
S-Video, SCART and RGB). The CVBS interface can
easily be identified from the yellow color of the RCA
jack.
DivX is a new high quality video codec which is based
on MPEG-4 standard and combined with MP3 audio.
Originally, the DivX-Codec was a Microsoft codec
(MPEG-4 v3). The official codec only used ASF format
(no AVI) or WMV format with Windows Media Encoder
7. The official codec had a bitrate limit which was
removed on DivX.
On the next stage of development, the codec was
developed completely new and is now 100% MPEG-4
compliant. The new codec os called DivX 4/5 and can
be obtained for free at his codec is also
compatible to videos encoded with the old DivX codec
(DivX 3.11). Today, DivX just a brand name for the
MPEG-4 encoder/player from DivX Networks that lives
from the fame of early DivX days.
Videos encoded with DivX 4/5 are fully MPEG-4
compliant and theoretically can be played on any
MPEG-4 enabled DVD player.
Dolby Digital 5.1 is a system for transmission and
storage of 5.1 channel sound on digital media as DVD,
digital TV and sattellite transmission. Different from the
codecs Dolby Surround and Pro Logic who do not
work with channel separation to encode the surround
sound in a stereo recording, Dolby Digital is a discrete
system where the different audio channels keep
completely separated during encoding and decoding.
Dolby Digital 5.1 is industry standard for coding of DVD
movies with surround sound.
Digital Signal Processor. Microprocessor for digital
processing of signals. Virtual Surround for example is
created with a DSP.
DTS is a coding standard similar to Dolby Digital . DTS
Digital Surround is a multichannel surround system
from Digital Theater Systems. Similar to Dolby Digital it
uses up to 5.1 channels. Different from Dolby, the data
rate can be far above 1 Mbit/sec so the sound is not
compresses as strong as in Dolby Digital resulting in a
higher sound quality.
The frequency range is from 20Hz to 20kHz at 20Bit, but
the subwoofer channels only transmits frequencies
below 80Hz. The coding system also is called CAC.
The DVD (Digital Versatile Disk) was introduced in
1995 and is a storage media with a large capacity.
While a standard CD can store 650 MB of data, the DVD
can store up to 9 GB. Especially when it comes to video
playback, a large storage capacity is important. Beyond
its high capacity, the consume
A Photo-Cd is a storage system for image storage on a
CD-ROM in a platform independent multi resolution
structure (support of different resolutions and file
formats, e.g. JPEG, BMP, etc). As a single camera film
dies not fill a complete CD, more films can be added to
the CD at a later time. A CD-R
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r enjoys high quality video
and audio. A DVD can store up to 8 different
audiostreams, so in best case, the movie can be
watched in 8 different languages.
OM drive must be
multisession enabled to load images from a Photo-CD.
www.divx.com. T
English

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