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Title: DETECTOR FOR TELEPHONE SURREPTITIOUS LISTENING TECHNIQUES

Abstract

An apparatus is described for attaching to a telephone to detect any attempt to wire-tap using the telephone microphone as a source of voice modulation. The approach taken is to continuously monitor the voltage across the microphone only when the telephone disconnect switch is actuated. If a voltage is detected, a device is operated to give a warning.

Inventors:
Issue Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4242291
Patent Number(s):
2875285
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-13-014956
NSA Number:
NSA-13-014956
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
GENERAL; COMMUNICATIONS; DETECTION; ELECTRIC POTENTIAL; ELECTRONIC EQUIPMENT; MODULATION; OPERATION; SOUND; SWITCHES; TRANSDUCERS; WIRES

Citation Formats

Hightower, E.D. DETECTOR FOR TELEPHONE SURREPTITIOUS LISTENING TECHNIQUES. United States: N. p., 1959. Web.
Hightower, E.D. DETECTOR FOR TELEPHONE SURREPTITIOUS LISTENING TECHNIQUES. United States.
Hightower, E.D. Tue . "DETECTOR FOR TELEPHONE SURREPTITIOUS LISTENING TECHNIQUES". United States.
@article{osti_4242291,
title = {DETECTOR FOR TELEPHONE SURREPTITIOUS LISTENING TECHNIQUES},
author = {Hightower, E.D.},
abstractNote = {An apparatus is described for attaching to a telephone to detect any attempt to wire-tap using the telephone microphone as a source of voice modulation. The approach taken is to continuously monitor the voltage across the microphone only when the telephone disconnect switch is actuated. If a voltage is detected, a device is operated to give a warning.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {2}
}