I, Q
I2C
ID BIT / TERMINATION
IDTV (EDTV)
IEEE
IEEE 1394
IF LOOP
IFF
IM
IMPEDANCE MATCHING
INTELSAT
INTERACTIVE TV
INTERLACING
INTERMEDIATE FREQUENCY (IF)
INTERPOLATION
IR
ITU
I, Q
A function related to the NTSC color difference signals, where I is one function involving different relationships or sums of R-Y and B-Y, and Q is another function.
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I2C
The name of a port and protocol used in industrial and consumer electronic devices. I2C ports are relatively slow, and therefore are most suitable for generation of the control signal effecting a large system. The advantage of this port system is simplicity and that only a small number of interface lines are needed.
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ID BIT / TERMINATION
A computer and a connected monitor identify each other by the ID BITs, which are specific pins of the connectors and cables linking them. Those pins, when connected to a signal common ground (terminated) indicate which monitor is connected, and what signal the computers’ graphics card should output to this specific monitor. A PC VGA system uses pins 4, 11 and 12 as the signaling bits, while a MAC computer uses pins 4, 7 and 10. Some PC notebooks output the VGA signal to an external VGA monitor only when shorting ID BIT pin 4 to ground. In this case, the notebook PC should sense the ID BIT at pin 4 connected to ground at boot-up.
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IDTV (EDTV)
Improved Definition Television (Enhanced Definition TV). This standard resembles HDTV in output quality without the complexity of the HDTV system. The improved picture quality is achieved by extensive processing carried out in the receiver. No different transmission system is needed.
0

IEEE
Institute of Electrical and Electronic Engineers. An organization that sets many communication, broadcast and other standards.
0

IEEE 1394
A recommendation for a fast universal interface and protocol developed by Apple™ and published by the Institute of the Electrical and Electronics Engineers, also called Firewire (iLINK). This standard allows fast interfacing between digital cameras, VCRs, CD-ROMs, hard disks, scanners, graphics cards and editing systems. Data rates of up to 400Mbit/sec are easily obtained by this standard as well as fast and accurate audio/video synchronization. This standard allows \''hot swapping\'' inputs and outputs, adding to its versatility. Firewire is catching on rapidly in the professional and consumer video market due to its simplicity, versatility and the ability to easily interconnect video and computer hardware. New definitions raise the standard to 800Mbps and higher.
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IF LOOP
(рус. Петля ПЧ)
The input and output of the IF circuitry provided by RF modulator when IF is being converted (modulated) to RF. The IF loop generated by the RF modulator is accessible externally and can be supplied to other RF modulators. They can also accept IF from another modulator in order to convert it back to RF.
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IFF
(рус. Петля ПЧ)
Interchange File Format. A graphics file format for Amiga computers, created by Electronic Art and Commodore.
0

IM
(рус. Петля ПЧ)
Intermodulation - distortion or noise. An undesired form of distortion generated by a non-linear amplifier carrying several different signals simultaneously.
0

IMPEDANCE MATCHING
Video signals should be treated with care and accuracy, as proper RF signals, since they occupy a very large spectrum of frequencies - from almost DC (0 Hz) up to several Megahertz. Video generally uses 75 Ohms cable and lines. Input and output impedance (a form of resistance) must be matched to 75 Ohms. If the output impedance of the video source, or the input impedance of the receiver, or the cable carrying the signal, are not properly matched to 75 Ohms, a series of problem may arise. Signal level will not be kept to standard, high frequencies will get lost and fine detail and color information will be lost. In addition, instability, oscillations apparent as snow, component heat-up and ghost images may also appear. In the digital domain, cable mismatch may create an instant signal breakdown (see Cliff Effect).
0

INTELSAT
International Communication Satellite Organization.
0

INTERACTIVE TV
A TV system which uses the TV/Cable-network for bi-directional communication. Via TV a user may order groceries, watch a selected movie (VOD- Video On Demand) or get the weather forecast.
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INTERLACING
A system developed for television to carry more channels in the broadcast band. This system reduces transmitted bandwidth to half by displaying each video frame by two interlacing (interwoven) fields. One field carries the even video lines and the other the odd lines. Interlacing causes a certain amount of visible flicker, but in live video it is hardly noticeable. Flicker is more disturbing in PAL, where the vertical line frequency is 50 Hz, and two 25 Hz fields are displayed one after the other, than in the 60 Hz NTSC system. Interlacing is sometimes used in the computer graphics field as well, where higher resolutions can be displayed on an inexpensive monitor by interlacing the image. However, with static images, such as computer-generated text and graphics converted to video, interlacing causes more annoying flicker. Many manufacturers try to eliminate or minimize the flicker effect related to interlacing by raising the allowable vertical frame frequency in PC monitors to 70 Hz and even higher. The trend nowadays is to eliminate interlacing wherever possible, even in the video domain, by line-doubling, scaling or using 100 Hz vertical scan rate TVs and monitors.
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INTERMEDIATE FREQUENCY (IF)
A frequency to which a signal wave is shifted locally as an intermediate step in transmission or conversion from one frequency to another. In TV transmissions, a video signal is modulated onto a high RF signal via IF as a temporary stage.
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INTERPOLATION
A term used in digital video for creation of new pixels by mathematical comparison to the adjacent pixels. It is the opposite of the Decimation process. This system is often used for DACs for easing the analog filtering requirements
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IR
(рус. ИК)
Infrared. An invisible light, below human eyes’ perceivable spectrum, used for communication between electronic devices and their remote control units. This method is short ranged, effective only at the line of sight. The IR signal may be converted to an electronic signal carried by a wire to a different location where it is reconverted to IR for controlling a remote device.
0

ITU
(рус. ИК)
International Telecommunications Union.
0

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