18WuD2x

166 data receiver • daylight lamp
To
other
computers
To
telephone
To
radio
transceiver
Monitor
Modem Computer Printer
Software
data-processing system
data receiver At a particular point in a dataprocessing
system, a circuit or device for
receiving data from a data transmitter.
data reception Receiving data signals from some
point within or outside a data-processing system.
data-reception system A data receiver and its associated
equipment.
data record A computer-processed record containing
a data unit.
data recorder A machine for storing data acquired
in the form of electrical signals (see DATA
RECORDING).
data recording 1. The preservation of data signals
by some process, such as magnetic-disk encoding,
optical-disk encoding, or tape recording, for
future use or as a backup. 2. A record of data signals,
as on magnetic tape.
data reduction The summarization of a mass of
electronically gathered data.
data-reduction system A system used to minimize
the amount of data necessary to convey given information.
data representation Values and data as described
by numerals, symbols, and letters (e.g., computer
program instructions).
data segment As related to a particular computer
process, a subunit of allocated storage containing
data only.
data selector/multiplexer A digital circuit that
has several or many input signals, and feeds one
of them onto a common line.
data set A device that connects a data processor to
a telegraph or telephone line.
data signal 1. A signal (such as one of binary bit
combinations) that can represent data as numbers,
letters, or symbols. 2. A signal current or
voltage proportional to some sampled quantity,
and that can be used to actuate indicating instruments
during tests or measurements.
data statement A computer source program statement
identifying a data item and specifying its
format.
data storage The preservation of data, particularly
computer files, for long periods of time in nonvolatile
form (no source of power is required to
ensure that the data remains intact).
data storage media Hardware that preserves data,
particularly computer files, for long periods of
time in nonvolatile form (no source of power is required
to ensure that the data remains intact).
Common media include magnetic disks, magnetic
tape, and optical disks.
data synchronizer A device used to synchronize
data transmission within a computing or processing
system.
data system 1. An arrangement for collecting,
recording, and routing data in the form of electrical
signals. 2. An arrangement for processing
data (i.e., for correlating, computing, routing,
storing, etc.).
data terminal A remote input/output device connected
to a central computer.
data throughput In a computer system, the
amount of data per unit time (bytes, kilobytes,
megabytes, gigabytes, or terabytes per second or
minute) that can be transferred from one place to
another.
data transducer In tests and measurements, a
transducer that converts a monitored phenomenon
into electrical quantities that can be
used for computer analysis or calculations.
data transmission Sending data signals from a
pickup point or processing stage to another point
within a data-processing system; also, sending
such signals to points outside the system.
data-transmission system A data transmitter and
its associated equipment.
data transmission utilization measure The ratio
of the useful data output of a data-transmission
system to the total data input.
data transmitter A circuit or device for sending
data from point to point within or outside of a
data-processing system.
data unit Characters in a group that are related in
a way that makes them a meaningful whole (e.g.,
a text word, or an object such as a circle in vector
graphics).
data value A measure of the amount of information
contained in a certain number of data bits.
The greater the ratio of the actual information to
the number of bits, the higher the data value.
data words In digital computer operations, words
(bit groups) representing data, rather than program
instructions.
DAVC Abbreviation of DELAYED AUTOMATIC
VOLUME CONTROL.
David Phonetic alphabet code word for letter D.
daylight effect The modification of transmission
paths during the day because of ionization of the
upper atmosphere by solar radiation.
daylight lamp An incandescent lamp whose filament
is housed in a blue glass bulb, which absorbs
some red radiation and transmits most of