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COBHAM H264ENC Guia do Utilizador Página 102

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SOLH264TX Broadcast Transmitter
H264TX, H264ENGTX, H264ENC
UNCLASSIFIED
Part A - User Guide
DS000091
Rev 1.2 2013-05-02
UNCLASSIFIED
Page 12-92
metre (i.e., 10
-9
m or one millionth of a millimetre).
Noise
Random pulses of electromagnetic energy generated by
lightening or electrical equipment.
O
Means…
Omni directional
antenna
An antenna whose radiation pattern shows equal radiation in all
horizontal directions.
Oscillation
A periodic, repetitive motion or set of values (voltage, current,
velocity).
P
Means…
PIR
Passive Infra Red sensor (PIR sensor) is an electronic device
that measures infrared (IR) light radiating from objects in its
field of view.
PTZ
Pan, Tilt and Zoom – PTZ is a common way of referring to
controllable cameras.
Propagation
A phenomenon by which any wave moves from one point to
another; the travel of electromagnetic waves through space or
along a transmission line.
R
Means…
Rx
Receiver, an electronic device that changes a radio signal from
a transmitter into useful information.
Radiate
To transmit RF energy.
Radio Frequency
Any frequency of electrical energy capable of propagation into
space (usually above 20kHz). Also called RF.
S
Means…
SNR
Signal to Noise Ratio is an electrical engineering
measurement defined as the ratio of a signal power to the noise
power corrupting the signal.
Signal-to-noise ratio compares the level of a desired signal (such
as music) to the level of background noise. The higher the ratio,
the less obtrusive the background noise is.
Signal
In electronics, a signal is an electric current or electromagnetic
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