DK428982A - Fremgangsmaade til aflytningssikker frekvensbaandkomprimeret overfoering af talesignaler - Google Patents

Fremgangsmaade til aflytningssikker frekvensbaandkomprimeret overfoering af talesignaler Download PDF

Info

Publication number
DK428982A
DK428982A DK428982A DK428982A DK428982A DK 428982 A DK428982 A DK 428982A DK 428982 A DK428982 A DK 428982A DK 428982 A DK428982 A DK 428982A DK 428982 A DK428982 A DK 428982A
Authority
DK
Denmark
Prior art keywords
sample values
sum signal
interview
procedure
frequency band
Prior art date
Application number
DK428982A
Other languages
English (en)
Inventor
Manfred Hanni
Josef Brusch
Original Assignee
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 Ag filed Critical Siemens Ag
Publication of DK428982A publication Critical patent/DK428982A/da

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Manipulator (AREA)
DK428982A 1981-09-28 1982-09-27 Fremgangsmaade til aflytningssikker frekvensbaandkomprimeret overfoering af talesignaler DK428982A (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19813138523 DE3138523A1 (de) 1981-09-28 1981-09-28 Verfahren zur abhoersicheren frequenzbandkomprimierten uebertragung von sprachsignalen

Publications (1)

Publication Number Publication Date
DK428982A true DK428982A (da) 1983-03-29

Family

ID=6142792

Family Applications (1)

Application Number Title Priority Date Filing Date
DK428982A DK428982A (da) 1981-09-28 1982-09-27 Fremgangsmaade til aflytningssikker frekvensbaandkomprimeret overfoering af talesignaler

Country Status (10)

Country Link
US (1) US4550222A (da)
EP (1) EP0075888B1 (da)
JP (1) JPS58137343A (da)
AT (1) ATE24988T1 (da)
AU (1) AU538736B2 (da)
CA (1) CA1193668A (da)
DE (2) DE3138523A1 (da)
DK (1) DK428982A (da)
ES (1) ES8306552A1 (da)
NO (1) NO155866C (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742543A (en) * 1983-12-22 1988-05-03 Frederiksen Jeffrey E Video transmission system
JPS6345933A (ja) * 1986-04-15 1988-02-26 Nec Corp 秘話装置
US4825468A (en) * 1986-10-24 1989-04-25 Broadband Engineering, Inc. Video noise jammer
US4817148A (en) * 1987-07-06 1989-03-28 Wegener Communications, Inc. Signal scrambling transmission system
DE3791003T1 (de) * 1987-08-26 1989-10-19 Vnii Radiovesh Priema Akustiki Einrichtung zur kodierung und dekodierung von tonprogramm-signalen
US5025452A (en) * 1990-03-20 1991-06-18 Andrew Corporation Full-duplex, sub-band spread spectrum communications system
DE4329010A1 (de) * 1993-08-28 1995-03-02 Sel Alcatel Ag Funksystem
WO2009074711A1 (en) * 2007-12-13 2009-06-18 Nokia Corporation Speech data encryption and decryption
WO2011075908A1 (en) * 2009-12-25 2011-06-30 Nokia Siemens Networks Oy Mapping reference signal for multi-cell transmission
US8326338B1 (en) 2011-03-29 2012-12-04 OnAir3G Holdings Ltd. Synthetic radio channel utilizing mobile telephone networks and VOIP

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944745A (en) * 1945-05-10 1976-03-16 Bell Telephone Laboratories, Incorporated Secret signaling system with means for preventing key disclosure
BE623892A (fr) * 1961-10-23 Siemens Ag Procödé pour la transmissions électrique d'informations
US3204034A (en) * 1962-04-26 1965-08-31 Arthur H Ballard Orthogonal polynomial multiplex transmission systems
CH518658A (de) * 1970-07-07 1972-01-31 Patelhold Patentverwaltungs Un Verfahren zur verschlüsselten Nachrichtenübermittlung durch zeitliche Vertauschung von Informationselementen
US3921151A (en) * 1971-06-21 1975-11-18 Patelhold Patentwerwertungs & Apparatus for enciphering transmitted data by interchanging signal elements of the transmitted data without overlapping or omitting any elements within the transmitted signal train
US4020285A (en) * 1972-09-29 1977-04-26 Datotek, Inc. Voice security method and system
DE2359673C2 (de) * 1973-11-30 1982-05-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum Verschleiern des Informationsinhaltes von Frequenzbändern
DE2450727C1 (de) * 1974-10-25 1979-11-29 Siemens Ag Anordnung zur Informationsuebertragung
US4052565A (en) * 1975-05-28 1977-10-04 Martin Marietta Corporation Walsh function signal scrambler
US4011408A (en) * 1975-12-17 1977-03-08 Trw Inc. Audio transmission protection apparatus
NL7600932A (nl) * 1976-01-30 1977-08-02 Philips Nv Bandcompressie systeem.
CH607506A5 (da) * 1976-06-01 1978-12-29 Europ Handelsges Anst
US4159399A (en) * 1976-09-29 1979-06-26 Tokyo Shibaura Electric Co., Ltd. Security communication system using polarity inversion
JPS5923507B2 (ja) * 1978-08-08 1984-06-02 富士通株式会社 中継台経由の専用線と内線の接続方式
DE2854832C2 (de) * 1978-12-19 1980-11-20 Siemens Ag, 1000 Berlin Und 8000 Muenchen Empfangsschaltung in einem störunterdrückenden Nachrichtenübertragungssystem mit schmalbandiger konventioneller Nachrichtenmodulation und zusätzlicher pseudozufalliger Phasensprungmodulation
JPS6035865B2 (ja) * 1979-12-27 1985-08-16 株式会社東芝 デ−タ伝送方式
US4383322A (en) * 1980-05-02 1983-05-10 Harris Corporation Combined use of PN sequence for data scrambling and frame synchronization in digital communication systems

Also Published As

Publication number Publication date
AU538736B2 (en) 1984-08-23
JPS58137343A (ja) 1983-08-15
ES515967A0 (es) 1983-06-01
NO823136L (no) 1983-03-29
DE3138523A1 (de) 1983-04-07
EP0075888A2 (de) 1983-04-06
EP0075888A3 (en) 1985-01-30
CA1193668A (en) 1985-09-17
JPS6234306B2 (da) 1987-07-25
ATE24988T1 (de) 1987-01-15
DE3275154D1 (en) 1987-02-19
NO155866B (no) 1987-03-02
NO155866C (no) 1987-06-10
ES8306552A1 (es) 1983-06-01
EP0075888B1 (de) 1987-01-14
AU8875782A (en) 1983-08-04
US4550222A (en) 1985-10-29

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Legal Events

Date Code Title Description
ATS Application withdrawn