Xoro HSD 8550 - Manual (Page 88)

42 HSD 8550
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GLOSSARY
Aspect ratio: 4:3 and 16:9
Full Frame refers to programs developed for TV display with an aspect ratio of 4:3. Widescreen
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 thickness 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 touch less 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.
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 available 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.
Component-Signal
please refer to YUV
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 available 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.
DSP
Digital Signal Processor. Microprocessor for digital processing of signals. Virtual Surround for
example is created with a DSP.