SE345774B - - Google Patents
Info
- Publication number
- SE345774B SE345774B SE12524/67A SE1252467A SE345774B SE 345774 B SE345774 B SE 345774B SE 12524/67 A SE12524/67 A SE 12524/67A SE 1252467 A SE1252467 A SE 1252467A SE 345774 B SE345774 B SE 345774B
- Authority
- SE
- Sweden
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals
-
- 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)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Dc Digital Transmission (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6612935A NL6612935A (es) | 1966-09-14 | 1966-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE345774B true SE345774B (es) | 1972-06-05 |
Family
ID=19797658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE12524/67A SE345774B (es) | 1966-09-14 | 1967-09-11 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3824468A (es) |
| AT (1) | AT285679B (es) |
| BE (1) | BE703775A (es) |
| CH (1) | CH460870A (es) |
| DE (1) | DE1537639A1 (es) |
| DK (1) | DK116799B (es) |
| ES (1) | ES344965A1 (es) |
| GB (1) | GB1201924A (es) |
| NL (1) | NL6612935A (es) |
| SE (1) | SE345774B (es) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4193030A (en) * | 1968-08-01 | 1980-03-11 | International Telephone And Telegraph Corporation | Frequency hopping communication system |
| US3696207A (en) * | 1969-05-14 | 1972-10-03 | Philips Corp | System for the transmission of intelligence by means of scrambled audiosignals |
| FR2416597A1 (fr) * | 1971-12-09 | 1979-08-31 | Berger Claude | Procede de codage d'un signal |
| FR2405601A1 (fr) * | 1975-12-18 | 1979-05-04 | Trt Telecom Radio Electr | Systeme radioelectrique de transmission d'informations par modulation d'une porteuse a frequence variable par sauts |
| US4159399A (en) * | 1976-09-29 | 1979-06-26 | Tokyo Shibaura Electric Co., Ltd. | Security communication system using polarity inversion |
| US4133977A (en) * | 1977-02-25 | 1979-01-09 | Lear Siegler, Inc. | Voice scrambler using syllabic masking |
| DE2737576C1 (de) * | 1977-08-22 | 1986-01-09 | Siemens AG, 1000 Berlin und 8000 München | Militaerisches Radar- oder Funk-Nachrichtenuebertragungssystem |
| US4276652A (en) * | 1978-10-02 | 1981-06-30 | Technical Communications Corp. | Secure communication system with improved frequency-hopping arrangement |
| US4379947A (en) * | 1979-02-02 | 1983-04-12 | Teleprompter Corporation | System for transmitting data simultaneously with audio |
| US4417349A (en) * | 1979-11-08 | 1983-11-22 | Digital Broadcasting Corporation | SCA Data transmission system with a raised cosine filter |
| FR2520955B1 (fr) * | 1982-01-29 | 1987-11-13 | Radiotechnique | Systeme electronique de transmission secrete de signaux audio |
| FR2530101A1 (fr) * | 1982-07-06 | 1984-01-13 | Thomson Brandt | Procede et systeme de transmission cryptee d'un signal, notamment audio-frequence |
| US4581765A (en) * | 1983-02-14 | 1986-04-08 | Matsushita Electric Industrial Co., Ltd. | Information security system |
| US4790009A (en) * | 1984-10-29 | 1988-12-06 | Victor Company Of Japan, Ltd. | Scrambler system |
| FR2580885B1 (fr) * | 1985-04-19 | 1988-07-08 | Radiotechnique | Systeme pour la transmission secrete de signaux audio, et televiseur pour la reception de tels signaux |
| US4654859A (en) * | 1986-04-09 | 1987-03-31 | Racal Data Communications Inc. | Frequency synthesizer for frequency hopping communication system |
| US4827507A (en) * | 1987-06-19 | 1989-05-02 | Motorola, Inc. | Duplex analog scrambler |
| GB2207328A (en) * | 1987-07-20 | 1989-01-25 | British Broadcasting Corp | Scrambling of analogue electrical signals |
| US5038402A (en) * | 1988-12-06 | 1991-08-06 | General Instrument Corporation | Apparatus and method for providing digital audio in the FM broadcast band |
| FR2645692B1 (fr) * | 1989-03-20 | 1992-08-14 | Cuvelier Antoine | Systeme pour la transmission secrete de signaux audio : cryptophonie par inversion de spectre. television, radio, telephone suivant le procede. dispositifs pour realiser des codeurs ou des decodeurs |
| US5335246A (en) * | 1992-08-20 | 1994-08-02 | Nexus Telecommunication Systems, Ltd. | Pager with reverse paging facility |
| US5430759A (en) * | 1992-08-20 | 1995-07-04 | Nexus 1994 Limited | Low-power frequency-hopped spread spectrum reverse paging system |
| IL104264A (en) * | 1992-08-20 | 1996-07-23 | Nexus Telecomm Syst | Remote location determination system |
| US5528692A (en) * | 1994-05-03 | 1996-06-18 | Motorola, Inc. | Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3696207A (en) * | 1969-05-14 | 1972-10-03 | Philips Corp | System for the transmission of intelligence by means of scrambled audiosignals |
-
1966
- 1966-09-14 NL NL6612935A patent/NL6612935A/xx unknown
-
1967
- 1967-08-30 DE DE19671537639 patent/DE1537639A1/de active Pending
- 1967-09-11 GB GB41328/67A patent/GB1201924A/en not_active Expired
- 1967-09-11 CH CH1263967A patent/CH460870A/de unknown
- 1967-09-11 AT AT828667A patent/AT285679B/de not_active IP Right Cessation
- 1967-09-11 SE SE12524/67A patent/SE345774B/xx unknown
- 1967-09-11 DK DK454167AA patent/DK116799B/da unknown
- 1967-09-12 ES ES344965A patent/ES344965A1/es not_active Expired
- 1967-09-12 BE BE703775D patent/BE703775A/xx unknown
- 1967-09-13 US US00667534A patent/US3824468A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NL6612935A (es) | 1968-03-15 |
| AT285679B (de) | 1970-11-10 |
| CH460870A (de) | 1968-08-15 |
| GB1201924A (en) | 1970-08-12 |
| DE1537639A1 (de) | 1969-09-18 |
| US3824468A (en) | 1974-07-16 |
| BE703775A (es) | 1968-03-12 |
| DK116799B (da) | 1970-02-16 |
| ES344965A1 (es) | 1968-11-01 |