NO155866C - Fremgangsmaate til avlyttingssikker overfoering av talesignaler med komprimert frekvensbaand. - Google Patents
Fremgangsmaate til avlyttingssikker overfoering av talesignaler med komprimert frekvensbaand.Info
- Publication number
- NO155866C NO155866C NO823136A NO823136A NO155866C NO 155866 C NO155866 C NO 155866C NO 823136 A NO823136 A NO 823136A NO 823136 A NO823136 A NO 823136A NO 155866 C NO155866 C NO 155866C
- Authority
- NO
- Norway
- Prior art keywords
- sample values
- sum signal
- procedure
- frequency band
- speed signals
- Prior art date
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)
- Radar Systems Or Details Thereof (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Manipulator (AREA)
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 (3)
Publication Number | Publication Date |
---|---|
NO823136L NO823136L (no) | 1983-03-29 |
NO155866B NO155866B (no) | 1987-03-02 |
NO155866C true NO155866C (no) | 1987-06-10 |
Family
ID=6142792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO823136A NO155866C (no) | 1981-09-28 | 1982-09-15 | Fremgangsmaate til avlyttingssikker overfoering av talesignaler med komprimert frekvensbaand. |
Country Status (10)
Country | Link |
---|---|
US (1) | US4550222A (no) |
EP (1) | EP0075888B1 (no) |
JP (1) | JPS58137343A (no) |
AT (1) | ATE24988T1 (no) |
AU (1) | AU538736B2 (no) |
CA (1) | CA1193668A (no) |
DE (2) | DE3138523A1 (no) |
DK (1) | DK428982A (no) |
ES (1) | ES515967A0 (no) |
NO (1) | NO155866C (no) |
Families Citing this family (10)
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 |
NL8720747A (nl) * | 1987-08-26 | 1989-07-03 | Vnii Radiovesh Priema Akustiki | Stelsel voor het coderen en decoderen van geluidprogrammasignalen. |
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 |
US10749657B2 (en) * | 2009-12-25 | 2020-08-18 | Nokia Solutions And 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)
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 (no) * | 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 |
-
1981
- 1981-09-28 DE DE19813138523 patent/DE3138523A1/de not_active Withdrawn
-
1982
- 1982-07-23 US US06/400,997 patent/US4550222A/en not_active Expired - Fee Related
- 1982-09-15 NO NO823136A patent/NO155866C/no unknown
- 1982-09-24 DE DE8282108849T patent/DE3275154D1/de not_active Expired
- 1982-09-24 EP EP82108849A patent/EP0075888B1/de not_active Expired
- 1982-09-24 AT AT82108849T patent/ATE24988T1/de active
- 1982-09-24 CA CA000412152A patent/CA1193668A/en not_active Expired
- 1982-09-27 AU AU88757/82A patent/AU538736B2/en not_active Ceased
- 1982-09-27 ES ES515967A patent/ES515967A0/es active Granted
- 1982-09-27 JP JP57166767A patent/JPS58137343A/ja active Granted
- 1982-09-27 DK DK428982A patent/DK428982A/da not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
DK428982A (da) | 1983-03-29 |
CA1193668A (en) | 1985-09-17 |
JPS58137343A (ja) | 1983-08-15 |
EP0075888A2 (de) | 1983-04-06 |
DE3275154D1 (en) | 1987-02-19 |
ES8306552A1 (es) | 1983-06-01 |
US4550222A (en) | 1985-10-29 |
EP0075888B1 (de) | 1987-01-14 |
JPS6234306B2 (no) | 1987-07-25 |
NO155866B (no) | 1987-03-02 |
AU538736B2 (en) | 1984-08-23 |
AU8875782A (en) | 1983-08-04 |
NO823136L (no) | 1983-03-29 |
ES515967A0 (es) | 1983-06-01 |
ATE24988T1 (de) | 1987-01-15 |
EP0075888A3 (en) | 1985-01-30 |
DE3138523A1 (de) | 1983-04-07 |
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