GB299915A - Improvements in secret signalling systems - Google Patents

Improvements in secret signalling systems

Info

Publication number
GB299915A
GB299915A GB20671/27A GB2067127A GB299915A GB 299915 A GB299915 A GB 299915A GB 20671/27 A GB20671/27 A GB 20671/27A GB 2067127 A GB2067127 A GB 2067127A GB 299915 A GB299915 A GB 299915A
Authority
GB
United Kingdom
Prior art keywords
relays
currents
speech
scrambler
bands
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20671/27A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE351858D priority Critical patent/BE351858A/xx
Priority to NL24066D priority patent/NL24066C/xx
Priority to US203703A priority patent/US1725032A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to GB20671/27A priority patent/GB299915A/en
Priority to DEI34457D priority patent/DE540782C/de
Priority to FR655685D priority patent/FR655685A/fr
Publication of GB299915A publication Critical patent/GB299915A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Selective Calling Equipment (AREA)
GB20671/27A 1927-07-06 1927-08-05 Improvements in secret signalling systems Expired GB299915A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE351858D BE351858A (de) 1927-08-05
NL24066D NL24066C (de) 1927-08-05
US203703A US1725032A (en) 1927-07-06 1927-07-06 Secret communicating system
GB20671/27A GB299915A (en) 1927-08-05 1927-08-05 Improvements in secret signalling systems
DEI34457D DE540782C (de) 1927-08-05 1928-05-22 Verfahren zur Geheimuebertragung von Signalen
FR655685D FR655685A (fr) 1927-08-05 1928-06-13 Perfectionnements aux systèmes électriques de signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20671/27A GB299915A (en) 1927-08-05 1927-08-05 Improvements in secret signalling systems

Publications (1)

Publication Number Publication Date
GB299915A true GB299915A (en) 1928-11-05

Family

ID=10149730

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20671/27A Expired GB299915A (en) 1927-07-06 1927-08-05 Improvements in secret signalling systems

Country Status (6)

Country Link
US (1) US1725032A (de)
BE (1) BE351858A (de)
DE (1) DE540782C (de)
FR (1) FR655685A (de)
GB (1) GB299915A (de)
NL (1) NL24066C (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132205A (en) * 1937-06-23 1938-10-04 Bell Telephone Labor Inc Secret transmission
DE3482363D1 (de) * 1983-09-30 1990-06-28 Nippon Telegraph & Telephone Funksendesystem fuer ein phasenmoduliertes signal.

Also Published As

Publication number Publication date
US1725032A (en) 1929-08-20
BE351858A (de)
NL24066C (de)
FR655685A (fr) 1929-04-23
DE540782C (de) 1932-01-07

Similar Documents

Publication Publication Date Title
GB536383A (en) Improvements in frequency modulation systems for radio signalling
US2535446A (en) Carrier communication system
GB283135A (de)
GB299915A (en) Improvements in secret signalling systems
GB332284A (en) Improvements in electrical transmission systems
US2397885A (en) Frequency diversity telegraph system
US1753353A (en) Electrical system for secret transmission
GB309063A (en) Improvements in secret electric signalling systems
US3651265A (en) Bipolar repeater
US2200559A (en) Transmission sysotfi
GB311451A (en) High frequency signalling over wires
US2218659A (en) Impulse repeater
GB299916A (en) Improvements in telephone and like signalling systems
US2109562A (en) Transmission system
US1677333A (en) Electrical protective system
US1742291A (en) Selective signaling system
US2336362A (en) Telegraph system
US1724082A (en) Means to control cross talk
GB301317A (en) Improvements in simultaneous telegraphy and telephony systems
US2077899A (en) Electrical signaling system
US1654900A (en) System for secret signaling
US1852051A (en) Telegraph repeater system
US1353031A (en) Vacuum-bulb for signaling apparatus
GB381960A (en) Improvements in alternating current signal receivers
Wolfe et al. Abridgment of problems in power-line carrier telephony and recent developments to meet them