GB371845A - Means for securing the secrecy of electrically transmitted intelligence, signals and the like - Google Patents

Means for securing the secrecy of electrically transmitted intelligence, signals and the like

Info

Publication number
GB371845A
GB371845A GB267731A GB267731A GB371845A GB 371845 A GB371845 A GB 371845A GB 267731 A GB267731 A GB 267731A GB 267731 A GB267731 A GB 267731A GB 371845 A GB371845 A GB 371845A
Authority
GB
United Kingdom
Prior art keywords
secrecy
securing
signals
transmission
electrically transmitted
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
GB267731A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB371845A publication Critical patent/GB371845A/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)

Abstract

371,845. Secret telephony. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. Jan. 27, 1931, No. 2677. Convention date, Feb. 28, 1930. Drawings to Specification. [Class 40 (iv).] In a system in which speech is divided into sub-bands, e.g. for scrambling or for transmission by separate channels, e.g. wire and wireless, or for transmission with different amounts of delay, the ranges of the initial filters overlap slightly, but where the subbands are sent over the same channel they are spaced by the usual modulating arrangements in a scrambler system or by auxiliary modulators in a differential delay system so that they do not overlap in the line &c,
GB267731A 1930-03-01 1931-01-27 Means for securing the secrecy of electrically transmitted intelligence, signals and the like Expired GB371845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE569790T 1930-03-01

Publications (1)

Publication Number Publication Date
GB371845A true GB371845A (en) 1932-04-27

Family

ID=34584603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB267731A Expired GB371845A (en) 1930-03-01 1931-01-27 Means for securing the secrecy of electrically transmitted intelligence, signals and the like

Country Status (3)

Country Link
DE (1) DE569790C (en)
FR (1) FR709392A (en)
GB (1) GB371845A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE431385B (en) * 1982-06-11 1984-01-30 Ericsson Telefon Ab L M SET TO DEFORT A VOICE SIGNAL, SET TO RESET THE DISTORTED VOICE SIGNAL, AND DEVICE TO DEFORT RESPECTIVE RESET VOICE SIGNAL
US5842473A (en) 1993-11-29 1998-12-01 Life Imaging Systems Three-dimensional imaging system

Also Published As

Publication number Publication date
DE569790C (en) 1933-02-08
FR709392A (en) 1931-08-06

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