D字彙

D band
D channel
D-picture

D.O.T(Department of Telecommunications)
DA-TDMA(Demand-Assignement Time-Division Multiple-Access)
DAC(Digitlal Analog Coverter)
Daemon process
DAFC(Digital Automatic Feequecncy )
DAGC(Delayed Automatic Gain )
DAMA(Demand Assinged Mutiple Access) satellite system
damping
DAP (U.S. Department of Defense Protocol Architecture)
DARPA INTERNET PROJECT
DAS(Data Acquistion System)
dat terminal set， airborne
datagram
datagram， external and internal
datakit
Dataphone Digital Service{=DDS}
dB/Hz (decibe/hertz)
dBm/Hz (decibel milliwatt/hertz)
dBmV (decibel-millivolt)
dBR (decibel relative)
DBR(Deternimistic Bit Rate)
DBX
DCL(Direct Communication Link)
DCPSK(Differentially Coded PSK)
DCQPSK
DCS(Double-Channed Simplex)
DCT coefficient
DCT(Discrete Consine Tansform)
deadlock
decay time
decibel{=dB}
decimation
decoded stream
deconvolution
deconvolution， Homomorphic
decoy
decyphering
dedicated channel
deemphasis
deemphassis and preemphasis
default conditioning
defaulting subscriber
defective modulation
DefenseCommunications Agency (DCA)
defensive satellite
defferred addressing
deformable insert connector
DEG(degree)
degeneracy in atom
degenerate modes
degenerative dlping
deiberate interference
delectric waveguide
Dellinger effect
DEMOD(Demodulator)
demoding circuit
demodulaiton-remodulation transponder
demodulated signal
demodulation
demodulatior (DEMOD)
demodulator， FMPLL
demultiplexer
demultiplexing
dense wavelength division multiplexing network
densities， bound-charge
density of traffic
density， magnetic flux
depletion layer
depressed clad fiber
depression angle
dequaztization
deregulation
descrambler
desensitization
design tradeoff
despatch
DET (Data Terminal Equipment)
DET(detector)
deta (CVSD) modulation， continuous variable stope
detectability factor
detected signal
detectivity
detectophone
detector
deviation ratio
deviation{=DEV}
deviation， phase
DEW(Distant Early Waring) line communication system
DF
DFM(Ditital Frequency Synthesizer)
DFS(Digital Frequency Synthisizer)
DFT(Discret Fourier Transform)
DGCRA(Dynamic GCRA)
DGT(Directorate Genral of Telecommunication)
DHS(Data Handing System)
DHT (Discrete Hadanmard Transform)
diagonal horn antenna
diagram， constelation
dialer
dialing{=DIAL}
dialint-out
diamagnetism
diameter{=DIA}
diaphragms
dibit transition
dicode
dictaphone
dictograph
die-away time
Dielectirc Resonator Oscillator (DRO)
dielectric， perfect
diffaction loss
differencially encoded coherent PSK
differenctial
differentiator
digitization
digitized voice system
dihedral (diplane) calibration reflector
dilaling， intermational subscriber
dimaeter， outside
diminishing rate
diodes， IMPATT
diplexer
diplexing
diple， two-dimensional
dipoies， bow-tie broadband
dipolar
dipoles array
Dirct Readout Infrared Radiometer (DRIR)
directionality
directivity
dirft velocity
DIS (Data Input Superivsor)
DISconnect Command (DISC)
Disconnected Mode (DM) response
discontinuities
discontinuity radiation
discriminant (in tracking loops)， velocity (doppler)
disk-capactior antenna
dislocation
dispersion， material
displaced phase center antenna
displacement current
display， A
dissipated power
distance， minimum
distortionless line
distribtuion， exponential
district telephone
dither signal
dithering
Ditial Target Extractor (DTE)
divergence
DM image coding
DMM (Digital MultMeter)
DN (down)
DNIC (Data Network Idenification Code)
DOD (Departement Of Defense)
dominant mode
dopants
doping of semiconductor
downmix
downsampler
downsampling
downward multiplexing
dowsampling filter
DP (Draft Proposal)
DPDT (Double-Pole Double-Trow)
Draft Internatioal Standard (DIS)
DRIR (Direct Readout Infrared Radiometer)
driving-point impedance
DRM (DOD Reference Model)
drop size distribution
DSB (Double Sideband)
DSB/SC (Double SideBand Suppressed Carrier)
DSCS (Defense Satellite Communication System)
DSM
DSS1
DSS2
DST (Daylight Saving Time)
DTDMA (Distributed Time-Division Multiple-Access)
DTMF (Dual -Tone Multi-Frequency)
DTS
DTU (Data Terminal Unit)
duct， advective
duobinary signaling
duplexer
duplexity
duplex， differencial
duplicity of data link
duration of bit
duroid
dust attenuation
dwell time
dynmaic crosstalk

dark current
dark current noise
dark current of optical detector
dark line defect from stress
dark line defect of laser
dark line defect of LED
dark spot defect of laser
dark spot defect of LED

Data Acquisition System (DAS)
Data Analysis Recording Tape{=DART}
data channel
data circuit-terminating equipment
data communication
Data Communication Channel{=DCC}
Data Communication Equipment{=DCE}
data compression
data element
data encoding
data encryption standard
data flow control
data flow machine
data frame
Data Handling System (DHS)
Data In Vocie (DIV)
data link
data link control
data link layer
data modulation rate
Data Network Identification Code (DNIC)
data partitioning
Data Processing Unit{=DPU}
data rate
Data Relay Satellite System{=DRSS}
Data Rranfer Ready
data set (modem)
Data Terminal Equipment (DTE)
Data Ternimal (DT)
data transfer phase/circuit switched network
data unit
Data Unit (DU)
data user part
data weitching exchange

data， micro-image
data， packet

DC blocks
DC coefficient
DC component
DC prediction
DC returns
DC term
DC(Data Channel)
DC-coded picture
DC-coefficient

decibels relative to one millwatt{=dBm}
decibels relative to one watt{=dBW}

decision theory
decision threshold
decision threshold ambiguity width
decision threshold level
decision time
decision-feedback equalizaion

decoder
decoder buffer
decoder characteristics
decoder compliance
decoder for linear code
decoder freference test data
decoder input puffer
decoder input rate
decoder memory
decoder requirements
decoder speed
decoder stroage
decoder synchroniaztion

decoder， algebraic
decoder， all channel
decoder， hybird
decoder， parallel
decoder， soruce
decoder， syndome

decoding
decoding algorithm， Reed
decoding alogrithm， Berlekamp
decoding by covering polynomials
decoding by error trapping
decoding delay
decoding error
decoding for alternant code
decoding for burst-error-correcting code
decoding for cyclic code
decoding for cyclic Hammin code
decoding for Fire code
decoding for Golay code
decoding for Goppa code
decoding for Hamming code
decoding for linear block code
decoding for product code
decoding permutation
decoding process
decoding rule
decoding time-stamp

decoding， adapive
decoding， atgebraic
decoding， hard-decision

decorrelation
decorrelation time

deep fading
deep sea cable
deep space communication
deep space satellite
deep-space mission

defect absorption
defect formation

defect， dark line
defect， dark spot
defect， draw-induced
defect， point

defense communications system
Defense Data Network (DDN)
Defense Satelite Communication System (DSCS)

deferred
deferred message
deferred rate
deferred traffic

degradation
degradation mechanism

degree of accuracy
degree of distortion

delay basis operation
delay distortion
delay equalizer
delay modulation
delay modulation code
delay on a call setting-up code
delay system
delay time
Delay-Line Canceller{=DLC}
delay/frequency distortion

delayed automatic agin control
Delayed Automatic Gain Control{=DAGC}
delayed automatic volume control
delayed call
Delayed Connector Network{=DCN}
Delayed Decision Coding{=DDC}
delayed decision image coding
delayed repeater satellite
delayed signal
Delayed Transmission
delayed-channel amplifier

delay， gropu
delay， packet
delay， phase

delectric， anisotropic
delectric， lossy

Delta function
Delta Modulation{=DM}

Demand -Assigned Multiple Access (DAMA)
demand assignment
demand assignment digital speech interpolation
demand assignment multiple access
demand assignment satellite network
demand assinged multiple access
Demand Assinged Multiple Access (DAMA) satellite system
demand basis toll switching system
demand-assigned circuit
demand-assignment pool

demodulation， noncoherent multichannel
demodulation， phase

Department Of Broadcasting and Television
Department Of Defense (DOD)
Department Of Navigation and Aviation
Department Of Posta and Telecommunications

dependent office
dependent repeater
dependent station

depth of modulation
depth of penertration

designation of addressee
designation of emission
designation of link
designation system

desination point
desination tribuary station

desk keyboard
desk switchboard
desk telephone

despreading
despreading spectrum

destination
destination code
destination indicator
Destination Point Code
destination-prefix

detection
detection process
detection range
detection threshold

detection， automatic target
detection， oil silck
detection， parity
detection， peak
detection， phase sensitive
detection， probability of

detector， envelope
detector， infared
detector， peak
detector， phase
detector， sillicon (Si) optical

Deterministic Bit Rate (DBR)
deterministic time division multiplexing

device， magneto-optic
device， monitoring
device， optoelectronic
device， perforated-paper

dial central office
dial exchange
dial private branch exchange
dial pulse
dial pulse counting circuit
dial pulse generator
dial speed
dial system tandem operation
dial system， all-relay
dial telegraph
dial telephone
dial telephone exchange
dial tone
dial up connection
dial ystem

dialed call
dialed number

dialing call
dialing tone
dialing unit
dialing-in

dialing， abbreviated
dialing， alternating current
dialing， automatic toll

Dicke radiometer
Dicke switched radiometer

dielectric antenna
dielectric breakdown
dielectric constant
dielectric constant of semiconductor
dielectric cylinder
dielectric discontinuities coaxial line
dielectric discontinuities microstrip
dielectric discontinuities stripline
dielectric discontinuities waveguide
dielectric loss
dielectric loss angle
dielectric obstacle
Dielectric Resonator{=DR}
dielectric rod antenna
dielectric rod guide
dielectric rod surface wave
dielectric rod wageguide
dielectric sheets
dielectric slab
dielectric spheres
dielectric stack
dielectric strength
dielectric tensor
dielectric-loaded waveguide
dielectric-slug tuner
dielectric-waveguide antenna

difference channel threshold coefficients
difference frequency
difference image
difference tone
difference-set block code
difference-set code

differencial coding
differencial coherent PSK
differencial duplex
differencial duplex telegraphic system
differencial encoding
differencial keying
differencial modulation
differencial PCM
differencial phase shift keying
differencial pulse code
differencial pulse position modulation

differential attenuation mode
Differential Binary Phase Shift Keying{=DBPSK}
differential code
differential component
differential encoding
differential frame
differential Manchester encoding
differential mode delay
Differential Phase Shift Keying{=DPSK}
Differential Pulse code Modulation (DPCM)
differential signaling

Differentially Coded PSK (DPSK， DCPSK)
differentially coherent PSK

diffraction
diffraction angle
diffraction limited antenna

diffuse coding
diffuse reflection
diffuse scatter
diffuse threshold decoder

diffusion
diffusion coefficient

digit
digit dialing

digital
Digital Analog Converter{=DAC}
Digital Automatic Frequency Control{=DAFC}
digital channel
digital coding
digital command system
digital communication
digital communications techinque
digital comparator
digital complement
digital control signal
digital data communication system
digital data delay distortion
digital data encoding
digital data processing system
digital data processor
digital data transmission
digital decoder
digital delay generator
digital delay-line canceller
digital echo canceller
digital echo suppressor
digital encoder
digital encoding system
digital filler
digital filler bank
digital frequency analyzer
Digital Frequency Meter (DFM)
digital frequency synthesizer
Digital Frequency Synthesizer (DFS)
digital information
digital integrator
digital intensity modulation
digital loop carrier system
digital microwave relay system
digital modulation
digital modulator
digital MTI processor
Digital MultiMeter (DMM)
digital multiplexer
digital multiplexing synchronizer
digital network
Digital Network Architecture (DNA)
digital PBX system
digital phase shifter
Digital Phase-Locked Loop{=DPLL}
digital pipe
Digital Readout Oscilloscope (DRO)
digital reconstructed image data
digital scan conversion
digital selector
digital signal
Digital Signal Processing{=DSP}
digital signal synchronizer
digital signature private key
digital signature public key
digital speech interpolation
digital still image
digital storage media
digital submarine cable
digital surce image data
digital switching devices
digital switching modular architecture
digital system
digital system bandwidth
digital telephone switching service
digital termination service
digital transmission
digital transmitter
digital visual frequency network
digital voice system
Digital VoltMeter{=DVM}
digital-analog conversion
digital-data transmitter
Digital-to-Analog Converter{=DAC}

diode， BARITT
diode， Easki
diode， Limited Spacecharge Accumulation (LSA)

diplex
diplex circuit
diplex generator
diplex operation
diplex reception
diplex system
diplex telegraphy
diplex transmission

dipole
dipole antenna
dipole array
dipole moment

dipoles， dielectric coating of
dipoles， discone
dipoles， effective length of
dipoles， electricmagnetic
dipoles， fan
dipoles， fiinite feed gap
dipoles， finite length
dipoles， horizontal
dipoles， parallel in echelon
dipoles， vertical
dipoles， wire simulation boradband

dipole， bicontical
dipole， fan
dipole， offset feed of
dipole， shunt feeding of
dipole， sleeve

dipulse
dipulse code

direct access capability
direct access communication channel
direct bandgap
Direct Broadcast Satellite{=DBS}
direct burial cable
direct channel
direct communication
direct coupling
direct current selection
direct current telegraphy
Direct Current{=DC}
direct detection
direct dial telephone system
direct dialing
Direct Dialing System{=DDS}
Direct Dialing-In
direct digital encoder
direct distance dialing
direct distance dialing netwrok
direct distance dialing telephone
direct distance service
direct distrbution
direct exchange
direct exchange line
direct frequency synthesizer
direct inward dialing{=DID}
direct line subscriber
direct link
Direct Outward Dialing{=DOD}
direct product code
direct sequece CDMA
direct sequence
direct sum code
direct-challenge systme
direct-current dialing
direct-current key pulsing
direct-current quadruplex
direct-current signaling
direct-current system
direct-current telegraph
direct-current transmission
direct-excitation transmitter

direction coupler， GRIN-rod lens
direction finder{=DF}
direction finding
direction finding receiver
direction finding system
direction of scanning
direction-finding antenna
direction-finding station

directional antenna
directional beacon
directional broadcasting
directional coupler
directional coupler， aperture copuling
directional coupler， directivity of
directional coupler， scattering matrix of
directional coupler， T
directional coupler， two-hole
directional coupler， two-port
directional coupler， X
directional coupler， Y
directional radio
directional radio beacon
directional radio radiation
directional radio signal
directional radio telegraphy
directional receiver
directional reception
directional transmitter
directional wireless

directive gain
directive radio beacon
directive radio station
directive reception
directive wireless telegraphy

Directorate General of Telecommunication (DGT)
Directorate-Gereral of Posts

directory information desk
directory server/ attributes
Directory Services (DS)

discone antenna
discone dipole

discrete consine transform
Discrete Cosine Transform (DCT)
discrete coupling
Discrete Fourier Series{=DFS}
Discrete Fourier Transform (DFT)
discrete frequecny coding
Discrete Hadamard Transform (DHT)
Discrete Memoryless Channel{=DMC}
discrete signal
discrete-time filter
discrete-time signal
discrete-time signal processing
discrete-time signal sequence
discrete-time signal， random

discriminator， blanced FM detector
discriminator， frequency
discriminator， phase

dispersion
dispersion definition
dispersion flattened fiber
dispersion limit
dispersion limit lightwave communications system
dispersion measurement
dispersion model
dispersion optimization
dispersion profile
dispersion relation
dispersion-equalization
dispersion-shifted fiber

display
display order

dissipative current
dissipative loss
dissipative matching networks

distortion
Distortion Fate Function (DRF)
distortion function

distortion， adjustable interruption
distortion， aliasing
distortion， harmonic
distortion， linear
distortion， miximum
distortion， phase

distributed architecture
Distributed Bragg Refector (DBR) laser
distributed control
Distributed FeedBack{=DFB} laser
Distributed FeedBack{=DFB} Laser Diode{=LD}
distributed network
Distributed Network Architecture (DNA)
distributed parameter

distribution， Chebyschev
distribution， equilibium mode
distribution， multivariate Gaussian
distribution， near field intensity
distribution， Poisson

ditital companding
ditital telephony
ditital television

diversity， anteena beams
diversity， path
diversity， polarization

Dolph pattern
Dolph-chebyshev array
Dolph-Chebyshev weighting
Dolph-Tschebyscheff linear array

dome antenna
dome LED

donor impurity
donor to acceptor recombination

Doppler ambiguity
Doppler beam sharpening
Doppler bin
Doppler blind zone
Doppler broadening in laser
Doppler buffer
Doppler effect
Doppler filter
Doppler frequency
Doppler frequency shift
Doppler navigation
Doppler navigator
Doppler power spectrum
Doppler processing
Doppler profile
Doppler resolution
Doppler shift
Doppler signature
Doppler spectrum
Doppler spread
Doppler tracking
Doppler tracking loop

double eccentric connector
Double Frequency Shift Keying{=DFSK}
Double Heterojunction{=DH} injection laser
Double Heterojunction{=DH} LED
double refectro antenna
double sideband amplitude modulation (DSB-AM)
double sideband modulation
Double SideBand Suppressed Carrier (DSBSC)
Double SideBand Transmitted Carrier (DSBTC)
double star topology
double-balanced mixer
Double-Channel Simplex (DCS)
double-delay canceller
double-delay feedback canceller
double-error-correcting code
Double-Pole Double-Throw (DPDT)
Double-Pole Single Throw{=DPST}
Double-Pole Three-Throw{=DPTT}
Double-SideBand{=DSB} noise figure
double-stub impedance matching
double-stub tuner

doubly-clad dispersion-shifted fiber
doubly-clad fiber

down coverter
down-conversion

DPCM (Differential Pulse Coded Modulation)
DPCM image coding
DPCM/PCM hybrid coding

drawing apparatus
drawing diameter control
drawing induced losses
drawing speed

drift
drift of carrier
drift-leakage model

DRO (Dielectric Resonator Oscillator)
DRO (Digtal Readout Oscilloscope)

DS (Dial Service)
DS (Dirctory Service)
DS (Direct Sequence)
DS-CDOA system， asynchronous
DS-COMA， synchronous

DSC (Data Synchronizer Channel)
DSC (District Switching Center)

DSN (Deep Space Network)
DSN (Dielectric Stabilized Oscillator)

DT (Data Terminal)
DT (Delayed Transmission)

dual channel mode
dual code
Dual In-line Package{=DIP}
dual path interference
dual polarization
dual ring network
dual-conversion
dual-frequency radar
dual-k convolutional code
dual-mode horn
dual-mode seeker
dual-mode transducer
dual-mode wavegude filter
dual-mode waveguide
dual-reflector antenna
dual-shaped reflector
dual-surface lense
Dual-Tone MultiFrequency (DTMF)
dual-tone multiple frequecny
dual-wavelength LED

duality
duality principle

duplex
duplex connector
duplex-to-simplex connector

duty cycle
duty factor

dyadic
dyadic permeabillity
dyadic permittivity

dynamic
dynamic fatigue
Dynamic GCRA
dynamic locking quantizer
dynamic network control
dynamic range
dynamic range of coefficient variance
dynamic response
dynamic transmission channel switching

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