delta modulation

Delta modulation (DM): Analog-to-digital signal conversion in which (a) the analog signal is approximated with a series of segments, (b) each segment of the approximated signal is compared to the original analog wave to determine the increase or decrease in relative amplitude, (c) the decision process for establishing the state of successive bits is determined by this comparison, and (d) only the change of information is sent, i.e., only an increase or decrease of the signal amplitude from the previous sample is sent whereas a no-change condition causes the modulated signal to remain at the same 0 or 1 state of the previous sample. Examples of delta modulation are continuously variable slope delta modulation, delta-sigma modulation, and differential modulation.

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subroutine
data access arrangement
data bank
data compaction
data element
data forwarder
data integrity
data link
data service unit
data signaling rate
data transmission circuit

date time group
db (car)
db(a)
dbm
dbrn
data circuit terminating equipment
decollimation
decrypt
degradation
degree of isochronous distortion
degree of start stop distortion

dejitterizer
delay
delay encoding
delay line
demand assignment
demand factor
demand load
desensitation
design objective
detector
deterministic routing

d 4
pulse dialing
dial up
dielectric
dielectric strength
differential encoding
differential manchester encoding
diffraction grating
digital access and cross connect system
digital filter
digital milliwatt