CCTV Glossary
Cascadia Video Products LLC
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I
IDE - Interface device electronics. Software and hardware communication standard for
interconnecting peripheral devices to a computer.
I/O - Input/Output.
I/P - Input. A signal applied to a piece of electric apparatus or the terminals on the apparatus to
which a signal or power is applied.
I2R - Formula for power in watts (W), where I is current in amperes (A), R is resistance in ohms
(W).
IEC - International Electrotechnical Commission (also CEI).
Imaging device - A vacuum tube or solid state-device in which the vacuum tube light-sensitive
face plate or solid-state light-sensitive array provides an electronic signal from which an image can
be created.
Impedance - A property of all metallic and electrical conductors that describes the total opposition
to current flow in an electrical circuit. Resistance, inductance, capacitance and conductance have
various influences on the impedance, depending on frequency, dielectric material around
conductors, physical relationship between conductors and external factors. Impedance is often
referred to with the letter Z. It is measured in ohms, whose symbol is the Greek letter omega - W.
Input - Same as I/P.
Inserter (also alphanumeric video generator) - A device for providing additional information,
normally superimposed on the picture being displayed; this can range from one or two characters
to full-screen alphanumeric text. Usually, such generators use the incoming video signal sync
pulses as a reference point for the text insertion position, which means if the video signal is of poor
quality, the text stability will also be of poor quality.
Interference - Disturbances of an electrical or electromagnetic nature that introduce undesirable
responses in other electronic equipment.
Interlaced scanning - A technique of combining two television fields in order to produce a full
frame. The two fields are composed of only odd and only even lines, which are displayed one
after the other but with the physical position of all the lines interleaving each other, hence interlace.
This type of television picture creation was proposed in the early days of television to have a
minimum amount of information yet achieve flickerless motion.
Interline transfer - This refers to one of the three principles of charge transferring in CCD chips.
The other two are frame transfer and frame-interline transfer.
IP - Index of protection. A numbering system that describes the quality of protection of an
enclosure from outside influences, such as moisture, dust and impact.
IRE - Institute of Radio Engineers. Units of measurement dividing the area from the bottom of
sync to peak white level into 140 equal units. 140 IRE equals 1Vpp. The range of active video is
100 IRE.
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