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12. Appendix
GB54
User’s Manual
12.5 Glossary
1. DiSEqC (Digital Satellite Equipment Control)
A DiSEqC compatible receiver relies on a switching box which detects the 22kHz tone pulsing rapidly
on and o. In this way, a specially designed receiver can control numerous LNBs through a DiSEqC
switching box.
2. Dolby Digital
An encoding system that digitally compresses up to 5.1 discrete channels of audio (left front, centre,
right front, left surround, right surround) into a single Bitstream. A low frequency eect (LFE) channel
is included providing the sound needed for special eects.
3. DVB (Digital Video Broadcasting)
Set of standards that dene digital broadcasts using satellite, cable or terrestrial systems.
4. EPG (Electronic Programme Guide)
An electronic equivalent to a printed television listings magazine; it is an application used with
digital set-top boxes and digital television sets to list current and scheduled programs that are or
will be available on each channel, including a short summary or commentary for each program. The
information supplied in the EPG is sent and updated by the channel broadcaster.
5. FEC (Forward Error Correction)
A technique for error control of data transmission.
6. Frequency
The property of a signal measured in cycles per second (=Hz).
7. FTA (Free- To-Air)
An unscrambled broadcaster allowing customers to view channels or services without paying any
subscription.
8. Hi-Fi (High Fidelity)
The characteristics of audio devices that can play back all the audio frequencies a person can detect,
which is the range of 16Hz~20KHz. Sometimes it is used to indicate good quality of audio devices such
as stereo tape recorders.
9. LNB (Low Noise Block)
A device that is mounted on an arm facing your satellite dish, focusing on satellite signals. A LNB
converts signals received from satellite to a lower frequency and sends them to a satellite receiver via
coaxial cable.
10. OSD (On Screen Display)
OSD displays the basic information necessary for the users to congure monitor or TV settings. OSD
information may include brightness, contrast, tuning, RGB adjustment, and screen size and position.
11. OTA (Over the Air)
A standard for the transmission of software for equipment, through a broadcast system. Manufacturers
reserve the right for deciding the release of the software for their products.
12. Polarisation
The direction of the electrical and magnetic elds of a signal. Satellites use both vertical and horizontal
polarisation so a frequency can be used twice.