18WuD2x

one output • on-state current 493
one output See ONE STATE.
one-output signal The signal that results from
reading a computer memory unit that is in the
logic 1 state.
one-output terminal In a flip-flop, the output terminal
that is energized when the circuit is in its
logic 1 state.
one-plus-one address A method of computer programming
in which instructions contain two addresses
and an operation, the addresses referring
to the location of the next instruction and the location
of the data to be used.
ones complement Binary notation in the radixminus-one-complement
form.
one shot See MONOSTABLE MULTIVIBRATOR.
one-shot circuit See MONOSTABLE MULTIVI-
BRATOR.
one-shot multivibrator See MONOSTABLE MUL-
TIVIBRATOR.
one-sided wave A waveform consisting of only negative
or positive half-cycles. Example: a rectified
alternating-current signal.
one state Also, logic 1 state. The high, on, or true
logic state of a bistable device, such as a flip-flop.
Compare ZERO STATE. In binary notation, the
one state is represented by the digit 1.
one-third-octave band A frequency band that is 1 ⁄3
octave wide; that is, the difference between
the upper-frequency limit (f 2 ) and the lowerfrequency
limit (f 1 ) is one-third of an octave. Also
see OCTAVE BAND.
one-to-one assembler An assembler computer
program that produces a machine language instruction
as a result of translating a sourcelanguage
statement.
one-to-one correspondence A mapping between
two sets A and B so that every element in set A
has exactly one correspondent in B, and every element
in B has exactly one correspondent in A.
O network A four-impedance network containing
two series (upper and lower) arms and two shunt
(input and output) arms.
Input
R SH1
R S1
R S2
O network
R SH2
Output
one-way communication 1. The transmission of a
message to one or more stations that receive only.
Compare TWO-WAY COMMUNICATION. 2. See
BROADCASTING.
one-way conduction See UNILATERAL CONDUC-
TIVITY.
one-way radio See ONE-WAY COMMUNICATION.
one-way repeater In wire telephony, a device that
amplifies and retransmits a signal in the direction
the signal was traveling when it arrived at
the repeater. Compare TWO-WAY REPEATER.
one-way valve A diode or rectifier (British variation).
on interval See ON TIME.
online 1. Descriptive of equipment under the control
of a central processor. 2. Pertaining to operations
being controlled by a central processor.
3. Relating to a computer storage device independent
of a central processor. 4. In personal computing,
the use of a computer in a network (e.g.,
with a modem for operation on the Internet).
Compare OFFLINE.
online data reduction Processing data as it enters
a computer system.
online editing In video production, the final phase
of editing. The original recording (not copies) is
used to prepare the presentation, based on the
trials that were performed using the copies. Compare
OFFLINE EDITING.
online service A computer network accessible via
telephone lines, television cable systems, and/or
radio. It is generally available to owners of personal
computers. It provides such services as
electronic mail, special-interest forums, news,
weather, sports, shopping, and general information.
on-off keying Keying, as in radiotelegraphy and
wire telegraphy, by switching a signal source on
and off to form dots and dashes or a binary code,
rather than alternately changing the amplitude or
frequency of the signal.
on-off operation A switching operation, especially
that performed by nonmechanical (fully electronic)
circuits.
on-off ratio 1. For a circuit or device, the ratio of
off time to on time. 2. For a pulse, the ratio of
pulse duration to the dead space between pulses.
on-off switch 1. In electronic equipment, the
switch by which the equipment can be started or
stopped. It can be, but is not necessarily, the
power-line or B-plus switch. 2. An electronic circuit
or stage that is designed to operate as a conventional
switching element when triggered by an
appropriate signal.
on period See ON TIME.
ONR Abbreviation of Office of Naval Research.
on resistance See ON-STATE RESISTANCE.
on state 1. For a switch or switching device (such
as a flip-flop), the condition of the device when it
conducts current or delivers an output voltage.
Compare OFF STATE, 1. 2. The condition of a circuit
or device that is activated for operation.
Compare OFF STATE, 2.
on-state current The current flowing through a
semiconductor device (such as a diode, rectifier,
or thyristor) when it is conducting. Also see ON-
STATE VOLTAGE.