IEEE Std 100-1996
`
`v|
`
`The IEEE Standard Dictionary of
`Electrical and Electronics Terms
`
`Sixth Edition
`
`Standards Coordinating Committee 10, Terms and Definitions
`Jane Radatz, Chair
`
`This standard is one of a number of information technology dictionaries being developed by standards
`organizations accredited by the American National Standards Institute. This dictionary was developed
`under the sponsorship of voluntary standards organizations, using a consensus-based process.
`
`ISBN 1-55‘13?-533-E
`
`HUI
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`_
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`9 781559 Fem ner Sirius XM Radio Inc. - Ex. 1010, p. 1
`
`Petitioner Sirius XM Radio Inc. - Ex. 1010, p. 1
`
`

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`demand register-single-pointer form
`
`270
`
`dependeD:·
`
`demand register-single-pointer form An indicating demand
`register from which the demand is obtained by reading the
`position of a pointer relative to the markings on a scale.
`The single pointer is resettable to zero.
`
`(ELM) C!2.1 -1988
`demand-totalizing relay A device designed to receive and to(cid:173)
`talize electric pulses from two or more sources for transmis(cid:173)
`sion to a demand meter or to another relay. See also: demand
`(ELM) C 12.1 -!982s
`meter.
`demarcation strip (data transmission) The terminals at which
`the telephone company's service ends and the customer's
`equipment is connected.
`(PE) 599-1985w
`demineralization The process of removing dissolved minerals
`(usually by chemical means).
`(StdlOO) [71]
`demodulate To receive signals transmitted over a communi(cid:173)
`cations computer; and to convert them into electrical pulses
`th at can serve as inputs to a computer system. Contrast: mod(cid:173)
`ulate.
`(C) 610.7-1995
`demodulation (1) A modulation process wherein a wave re(cid:173)
`sulting from previous modulation is employed to derive a
`wave having substantially the characteristics of the original
`modulating wave. Note: The term is sometimes used to de(cid:173)
`scribe the action of a frequency converter or mixer, but this
`practice is deprecated except in the case of shifting a single(cid:173)
`sideband signal to baseband.
`(IT) [123]
`(2) (data transmission) A modulation process wherein a
`wave resulting from previous modulation is employed to de(cid:173)
`rive a wave substantial to the characteristics of the original
`modulating wave. Note: The term is sometimes used to de(cid:173)
`scribe the action of a frequency converter or mixer, but this
`practice is deprecated.
`(PE) 599-1985w
`(3) (overhead power lines) The process by which the signal
`is recovered from a modulated carrier.
`(PE/T&D) 539-1990
`(4) The reconversion of a modulated signal back into its orig(cid:173)
`inal form by extracting the data from the modulated carrier.
`(C) 610.7-1995
`Contrast: modulation.
`demodularization In software design, the process of combining
`related software modules, usually to optimize system per(cid:173)
`formance. See also: downward compression; lateral com(cid:173)
`pression; upward compression.
`(C) 610. I 2-1990
`demodulator A device to effect the process of demodulation.
`(StdlOO) 270-1964w
`See also: demodulation.
`demodulator-modulator See: modem.
`demonstration (1) (safety systems equipment in nuclear
`power generating stations) The provision of evidence to
`support the conclusion derived from assumed premises.
`(PE) 627-1980r
`(2) (Class IE battery chargers and inverters) A course of
`reasoning showing that a certain result is a consequence of
`assumed premises; an explanation or illustration, as in teach(cid:173)
`ing by use of examples.
`(PE) 650-1979s
`(3) (software) A dynamic analysis technique that relies on
`observation of system or component behavior during execu(cid:173)
`tion, without need for post-execution analysis, to detect er(cid:173)
`rors, violations of development standards, and other prob(cid:173)
`(C) 610.12-1990
`lems. See also: testing.
`demultiplexer An electronic switch with one input and several
`outputs. Encoded selection signals control which output is
`connected to the input. Contrast: multiplexer.
`(C) 610.7-1995
`demultiplexing The separation from a common input into sev(cid:173)
`eral outputs. For example, hardware may demultiplex signals
`from a transmission line based on time or carrier frequency
`to allow multiple. simultaneous transmissions across a single
`physical cable. Contrast: multiplexing.
`(C) 610.7-1995
`denary See: decimal.
`denial of message service Preventing or delaying the perform(cid:173)
`ance of legitimate or critical communication services. Denial
`of message service attacks may be perpetrated at any point in
`the communication architecture (e.g., data link, network,
`
`transport, application), and could result in denial of sc:-
`conditions.
`(BA/C) 896.3- : -··
`denormalized number (l) (mathematics of computing
`nonzero floating-point number whose exponent has a reser. 7.
`value, usually the format's minimum, and whose explicit . ·
`implicit significand digit is zero.
`(C)
`I 084-1986·-(cid:173)
`(2) (binary floating-point arithmetic) A nonzero floating·
`point number whose exponent has a reserved value, usual\:.
`the format' s minimum, and whose explicit or implicit leadin'
`significand bit is zero.
`(C/MM) 754-1985:
`dense binary code A binary code in which all possible bit com-
`binations are used.
`(C)
`I 084-1986"
`dense list See: packed array.
`densitometer (illuminating engineering) A photometer fo:
`measuring the optical density (common logarithm of there(cid:173)
`ciprocal of the transmittance or reflectance) of materials.
`(EEC/IE) [126:
`density (1) (facsimile) A measure of the light-transmitting or
`reflecting properties of an area. Notes: 1. It is expressed by
`the common logarithm of the ratio of incident to transmitted
`or reflected light flux. 2. There are many types of density that
`will usually have different numerical values for a given ma(cid:173)
`terial; for example, diffuse density, double diffuse density.
`specular density. The relevant type of density depends upon
`the geometry of the optical system in which the material is
`used. See also: scanning.
`(COM) 168-l956w
`(2) (electron or ion beam) The density ofthe electron or ion
`current of the beam at any given point.
`(StdlOO) [84]
`(3) (computers) See also: packing density.
`( 4) (A) On an integrated circuit, the number of logic gates per
`unit area of usable surface. See also: chip density; surface
`density. (B) A measure of the number of characters per inch
`on an output medium such as paper. See also: recording den(cid:173)
`sity.
`(C) 610.10-1994
`density coefficient See: environmental coefficient.
`density-modulated tube (microwave tubes) (space-charge(cid:173)
`control tube) Microwave tubes or valves characterized by
`the density modulation of the electron stream by a gating
`electrode. Note: The electron stream is collected on those
`electrodes that form a part of the microwave circuit, princi(cid:173)
`pally the anode. These electrodes are often small compared
`to operating wavelength so that for this reason space-charge(cid:173)
`control tubes or valves are often not considered to be micro(cid:173)
`wave tubes even though they are used at microwave fre(cid:173)
`quencies.
`(ED)
`[45]
`density modulation (electron beams) The process whereby a
`desired time variation in density is impressed on the electrons
`of a beam. See also: velocity-modulated tube.
`[84]
`(StdlOO)
`density-tapered array antenna See: space-tapered array an(cid:173)
`tenna.
`denuder That portion of a mercury cell in which the metal is
`separated from the mercury.
`(EEC/PE) [119]
`dependability (of a relay or relay system) The facet of reli(cid:173)
`ability that relates to the degree of certainty that a relay or
`relay system will operate correctly.
`(PE/SWG) C37.100-1992, C37.90-1978s
`dependable capability (power operations) The maximum gen(cid:173)
`eration, expressed in kilowatt-hours per hour (kWh/h) which
`a generating unit, station, power source, or system can be
`depended upon to supply on the basis of average operating
`conditions.
`(PE) 858-1987s
`dependable capacity The maximum capacity modified for am(cid:173)
`bient limitations that a generating unit, power plant, item of
`electrical equipment, or system can sustain over a specified
`period of time.
`(PE) 762-1987r, 858-1993
`dependency (1) A logical relationship between two tests or be(cid:173)
`tween a test and an element of the unit under test (UUT)
`(either an actual part or a failure mode of a part). A diagnostic
`test is said to be dependent on a particular diagnostic element
`
`Petitioner Sirius XM Radio Inc. - Ex. 1010, p. 2
`
`