Glossary – Humax VA-FOX User Manual

Page 5

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Glossary

GB3

Antenna

A device that collects and radiates electromagnetic waves. Includes a satellite dish and
abroadband antenna.

Forward Error Correction(FEC)

A system of error control for data transmission.

Frequency

The number of cycles or events per one second, which is expressed in the unit of Hertz(Hz).

Intermediate Frequency(IF)

A frequency to which a carrier frequency is shifted as an intermediate step in transmission or
reception.

Low Noise Block(LNB) Downconverter

A low noise microwave amplifier and converter which downconverts a range of frequencies
to IF range.

Packet Identifier(PID)

A set of numbers that idenitifies transport stream packets containing data from a single data stream.

Polarisation

Characteristic of an electromagnetic wave determined by the orientation of the electricfield vector.

Quaternary Phase Shift Keying(QPSK)

Phase-shift keying in which four different phase angles are used.

Service

A channel to which a decoder or TV is tuned.

Transponder

An automatic device that receives, amplifies and retransmits a signal on a different frequency.

Glossary

English (HSMM30GB) 10/30/02 10:05 AM Page 6

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