18WuD2x

676 telephone amplifier • televise
telephone line, and others receive sound from the
telephone receiver.
telephone-answering machine See ANSWERING
MACHINE.
telephone bypass capacitors A set of fixed capacitors
installed between each wire in a telephone
line and an electrical ground to bypass radiofrequency
energy. It can reduce or prevent radiofrequency
interference (RFI) to telephone sets and
data terminals.
telephone data set A device that converts signals
from a data terminal for passage over a telephone
circuit to a data-processing center.
telephone dialer In a security system, a circuit
that automatically dials one or more telephone
numbers, alerting the recipient(s) that an emergency
exists at a given location.
telephone induction coil A small telephone-toline
impedance-matching transformer used in
telephone systems.
telephone patch See PHONE PATCH.
telephone pickup A device for receiving conversations
from a telephone to which it isn’t directly
connected.
telephone plug See PHONE PLUG.
telephone-radio patch See PHONE PATCH.
telephone receiver The handheld part of a telephone
set, containing the microphone and earphone,
and, in some cases, the dialing keypad.
telephone repeater An amplifier and associated
equipment used to boost the amplitude of a telephone
signal at an appropriate point along the
line.
telephone service entrance The point at which
the telephone wiring in a house or building connects
to the outside telephone line.
telephone silencer A device for muting a telephone
or its bell.
telephone system A complete, integrated, and coordinated
arrangement of equipment for communication
by means of telephony. Included are
telephones, switchboards and associated equipment,
wire lines and cables, and power supplies.
Also see DIAL TELEPHONE SYSTEM, HANDSET,
PRIVATE AUTOMATIC EXCHANGE (PAX), PRI-
VATE BRANCH EXCHANGE (PBX), and TELE-
PHONE.
telephone test set See PHONE TEST SET.
telephone transmitter The sound pickup unit
(microphone) of a telephone. Also see TRANSMIT-
TER, 2.
telephony The branch of electrical communication
dealing with the transmission and reception of
sounds—especially over wires. Also see WIRE
TELEPHONY.
Telephoto 1. The transmission and/or reception
of photographs by means of FACSIMILE. 2. A
photograph transmitted and/or received by
means of FACSIMILE.
telephoto lens A camera lens providing a telescopic
effect.
Telephoto receiver See FACSIMILE RECEIVER.
Telephoto transmitter See FACSIMILE TRANS-
MITTER.
telepresence An advanced form of robotic TELE-
OPERATION, in which a human operator has the
impression of being at the robot’s location. It includes
vision systems, pressure sensors, sound
sensors, tactile sensors, and electromechanical
control devices. The operator uses, or wears,
equipment similar to that used for VIRTUAL RE-
ALITY (VR).
teleprinter A terminal telegraph printing machine.
Also see PRINTING TELEGRAPH, 1, 2.
TelePrompTer A device that presents a running
display on a screen before a television announcer,
performer, or speaker, of dialogue.
teleran A ground-to-air communications system.
Ground-based radar pictures are transmitted, via
television, to aircraft.
telescoping antenna A vertical antenna consisting
of separate lengths of metal tubing of progressively
smaller diameter so that one can slide into
another. The antenna can be pulled out to full
length or compressed to the length of the largestdiameter
section.
telescoping antenna
teletext A method of communication in which a
video image is sent of a page of printed material.
telethermoscope A device for measuring the temperature
of distant objects.
Teletorque See AUTOSYN and SYNCHRO.
Teletype 1. The transmission and/or reception of
text messages in digital form, displayed or
printed at a distant location. 2. See TELETYPE-
WRITER.
teletype grade A term descriptive of a circuit having
the quality necessary for communication via
telegraphy.
Teletypesetter An electronic system for operating
a distant Linotype.
teletypewriter A variety of printing telegraph using
electric typewriters and associated equipment.
The message is typed on the keyboard at
the transmitting station and is typed out in corresponding
letters at the receiving station. The
same typewriter is able to send and receive messages.
Also see RADIOTELETYPEWRITER.
teletypewriter exchange Abbreviation, TWX. A
center for switching and routing teletypewriter
communications. Also see TELETYPEWRITER.
teleview To observe a scene or program via television.
televise 1. To convert a scene into a television
signal. 2. To broadcast a scene or program via
television.