Glossary - Xoro HSD 7580 Manual De Operación

GLOSSARY

Aspect ratio: 4:3 and 16:9
Full Frame refers to programs developed for TV display with an aspect ratio of 4:3. Wide-
screen refers to programs developed for screens with an aspect ratio of 16:9.
If a widescreen program is displayed on a 4:3 screen, the picture will have black borders on
top and bottom.
CD
A CD (Compact Disc) is a metal-coated plastic disc. It has a diameter of 12 cm and a thick-
ness of about 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 - Digital Audio) , CD-ROM (Compact Disc - Read
Only Memory), and the DVD (Digital 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 re-
flected 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.
Contrast
Means the range of luminance between the brightest and the darkest pixel, which can be
displayed.
CVBS
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 avail-
able interfaces (please also refer to YUV, S-Video, SCART and RGB). The CVBS interface
can easily be identified from the yellow colour of the RCA jack.
DTS®
DTS® is a coding standard similar to Dolby Digital®. DTS Digital Surround® is a multichan-
nel surround system from Digital Theatre 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 channel only trans-
mits frequencies below 80Hz. The coding system also is called CAC.
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