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facsimile
[communications] A system of communication in which a transmitter scans a photograph, map, or other fixed graphic material and converts the information into signal waves for transmission by wire or radio to a facsimile receiver at a remote point. Also known as fax; phototelegraphy; radiophoto; telephoto; telephotography; wirephoto.
A photograph transmitted by radio to a facsimile receiver. Also known as radiophoto.
[graphic arts] An exact copy of a book, document, painting, or other material.
Pronunciation: fak′sim· ·lē
color facsimile
[communications] A facsimile system for transmission of color photographs, in which three separate facsimile transmissions are made from the original color print, using color-separation filters in the optical system of the facsimile transmitter.
Pronunciation: ′kl·r ′fak′sim··lē
effective facsimile band
[communications] Frequency band of a facsimile signal wave equal in width to that between zero frequency and maximum keying frequency.
Pronunciation: ¦fek·tiv fak′sim··lē ′band
enciphered facsimile communications
[communications] Communications in which security is accomplished by mixing pulses produced by a key generator with the output of the facsimile converter; plain text is recovered by subtracting the identical key at the receiving terminal; unauthorized listeners are unable to reconstruct the plain text unless they have an identical key generator and the daily key setting.
Pronunciation: en′sī·frd fak′sim··lē k′myün·′kā·shnz
facsimile chart
[meteorology] Any graphic form of weather information, usually a type of synoptic chart, which has been reproduced by facsimile equipment. Also known as fax chart; fax map.
Pronunciation: fak′sim··lē ′chärt
facsimile modulation
[communications] Process in which the amplitude, frequency, or phase of a transmitted wave is varied with time in accordance with a facsimile transmission signal.
Pronunciation: fak′sim··lē ′mäj··′lā·shn
facsimile receiver
[electronics] The receiver used to translate the facsimile signal from a wire or radio communication channel into a facsimile record of the subject copy.
Pronunciation: fak′sim··lē ri′sē·vr
facsimile recorder
[electronics] The section of a facsimile receiver that performs the final conversion of electric signals to an image of the subject copy on the record medium.
Pronunciation: fak′sim· ·lē ri′k⊙rd·r
facsimile signal
[communications] The picture signal produced by scanning the subject copy in a facsimile transmitter.
Pronunciation: fak′sim· ·lē ′sig·nl
facsimile signal level
[electronics] Maximum facsimile signal power or voltage (root mean square or direct current) measured at any point in a facsimile system.
Pronunciation: fak′sim··lē ′sig·nl ′lev·l
facsimile transmitter
[electronics] The apparatus used to translate the subject copy into facsimile signals suitable for delivery over a communication system.
Pronunciation: fak′sim··lē tranz′mid·r
radio facsimile system
[communications] A facsimile system in which signals are transmitted by radio rather than by wire.
Pronunciation: ′rād·ē·ō fak′sim··lē ′sis·tm
wire facsimile system
[communications] A facsimile system in which messages are sent over wires or cables, rather than by radio.
Pronunciation: ′wīr fak′sim··lē ′sis·tm
facsimile posting
[computer science] The process of transferring by a duplicating process a printed line of information from a report, such as a listing of transactions prepared on an accounting machine, to a ledger or other recorded sheet.
Pronunciation: fak′sim·· lē ′pōst·iŋ
facsimile synchronizing
[electronics] Maintenance of predetermined speed relations between the scanning spot and the recording spot within each scanning line.
Pronunciation: fak′sim··lē ′siŋ· kr′niz·iŋ
facsimile telegraph
[communications] A telegraph system designed to transmit pictures.
Pronunciation: fak′sim··lē ′tel·′graf
background
[communications] Picture white of the facsimile copy being scanned when the picture is black and white only.
Undesired printing in the recorded facsimile copy of the picture being transmitted, resulting in shading of the background area.
Noise heard during radio reception caused by atmospheric interference or the operation of the receiver at such high gain that inherent tube and circuit noises become noticeable.
Pronunciation: ′bak′graudotnd
graphics
[communications] In communications systems, an information mode in which a graphic system is used to reproduce intelligence; a variation of facsimile.
Nonvoice analog information devices and modes such as facsimile, photographics, and television.
[science and technology] The graphic media.
The art of drawing a three-dimensional object on a two-dimensional surface according to mathematical rules of projection.
Pronunciation: ′graf·iks
negative modulation
[electronics] Modulation in which an increase in brightness corresponds to a decrease in amplitude-modulated transmitter power; used in United States television transmitters and in some facsimile systems.
Modulation in which an increase in brightness corresponds to a decrease in the frequency of a frequency-modulated facsimile transmitter. Also known as negative transmission.
Pronunciation: ′neg·d·iv ′mäj·′lā·shn
white-to-black amplitude range
[communications] In a facsimile system employing positive amplitude modulation, the ratio of signal voltage (or current) for picture white to the signal voltage (or current) for picture black at any point in the system.
In a facsimile system employing negative amplitude modulation, the ratio of the signal voltage (or current) for picture black to the signal voltage (or current) for picture white; this ratio is often expressed in decibels.
Pronunciation: ¦wīt t ¦blak ′am·pl′tüd ′rānj
audio-frequency shift modulation
[communications] System of facsimile transmission over radio, in which the frequency shift required is applied through an 800-hertz shift of an audio signal, rather than shifting the radio transmitter frequency; the radio signal is modulated by the shifting audio signal, usually at 1500 to 2300 hertz.
Pronunciation: ′⊙d·ē·ō ¦frē·kwn·sē ′shift mäj·′lā·shn
available line
[electronics] Portion of the length of the scanning line which can be used specifically for picture signals in a facsimile system.
Pronunciation: ′vāl··bl ′līn
black signal
[communications] Signal at any point in a facsimile system produced by the scanning of a maximum density area of the subject copy. Also known as black; picture black.
Pronunciation: ′blak ′sig·nl
black transmission
[communications] The amplitude-modulated transmission of facsimile signals in which the maximum signal amplitude corresponds to the greatest copy density or darkest shade.
Pronunciation: ′blak tranz′mish·n
carrier beat
[communications] An undesirable heterodyne of facsimile signals, each synchronous with a different stable reference oscillator, causing a pattern in received copy.
Pronunciation: ′kar·ē·r ′bēt
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