FR709392A - Device for ensuring the secrecy of news, signals, etc., transmitted by electrical means - Google Patents

Device for ensuring the secrecy of news, signals, etc., transmitted by electrical means

Info

Publication number
FR709392A
FR709392A FR709392DA FR709392A FR 709392 A FR709392 A FR 709392A FR 709392D A FR709392D A FR 709392DA FR 709392 A FR709392 A FR 709392A
Authority
FR
France
Prior art keywords
secrecy
news
ensuring
signals
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
Other languages
French (fr)
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
Application granted granted Critical
Publication of FR709392A publication Critical patent/FR709392A/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)
FR709392D 1930-03-01 1931-01-15 Device for ensuring the secrecy of news, signals, etc., transmitted by electrical means Expired FR709392A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
FR709392A true FR709392A (en) 1931-08-06

Family

ID=34584603

Family Applications (1)

Application Number Title Priority Date Filing Date
FR709392D Expired FR709392A (en) 1930-03-01 1931-01-15 Device for ensuring the secrecy of news, signals, etc., transmitted by electrical means

Country Status (3)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461298B1 (en) 1993-11-29 2002-10-08 Life Imaging Systems Three-dimensional imaging system

Families Citing this family (1)

* 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461298B1 (en) 1993-11-29 2002-10-08 Life Imaging Systems Three-dimensional imaging system

Also Published As

Publication number Publication date
GB371845A (en) 1932-04-27
DE569790C (en) 1933-02-08

Similar Documents

Publication Publication Date Title
FR721499A (en) Secret telegraph system
CH263428A (en) Receiver device for start-stop telegraph signals.
FR709392A (en) Device for ensuring the secrecy of news, signals, etc., transmitted by electrical means
FR32851E (en) Secret telegraphy system
FR718513A (en) Control device for telegraph installations
FR681290A (en) Method and device for the transmission of news by telegraph
CH125995A (en) Percussion device for rockets.
FR885039A (en) Device for the secrecy of the transmission of messages
DK44396C (en) Device for Secret Transmission of Electrical Signals.
FR576137A (en) Fitting device for insulators of power lines, telephone lines, telegraphs, etc.
ES116963A1 (en) Verification procedure of telephone, telegraphic or signal lines.
FR716790A (en) Device for electrically controlled punched-card tabulator recorders
ES116691A1 (en) Telephone transmission system.
DK42110C (en) Device for Secret Transmission of Signals.
DK43169C (en) Device for Secret Transmission of Signals.
DK42622C (en) Device for Secret Transmission of Signals.
FR621515A (en) Electrical device for encryption and decryption
FR583447A (en) Device for receiving telegraph signals
CH138699A (en) Removable electrical connection device.
FR684139A (en) Amplifier for quadruplex telegraph system
FR37941E (en) Device for locating the settings of t receiving stations. s. f.
CH153043A (en) Connection device for electric waving iron.
FR550708A (en) telephone earpiece more specially intended for aviators for the reception of t.s.f.
FR703890A (en) Adjustment control device for t receiving stations. s. f.
DK45140C (en) Coupling device for Telephone system.