FR2217875B1 - - Google Patents
Info
- Publication number
- FR2217875B1 FR2217875B1 FR7404708A FR7404708A FR2217875B1 FR 2217875 B1 FR2217875 B1 FR 2217875B1 FR 7404708 A FR7404708 A FR 7404708A FR 7404708 A FR7404708 A FR 7404708A FR 2217875 B1 FR2217875 B1 FR 2217875B1
- Authority
- FR
- France
- 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
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH202673A CH574692A5 (de) | 1973-02-13 | 1973-02-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2217875A1 FR2217875A1 (de) | 1974-09-06 |
| FR2217875B1 true FR2217875B1 (de) | 1978-05-12 |
Family
ID=4224178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7404708A Expired FR2217875B1 (de) | 1973-02-13 | 1974-02-12 |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS49119502A (de) |
| CA (1) | CA1003137A (de) |
| CH (1) | CH574692A5 (de) |
| DE (1) | DE2318489C3 (de) |
| FR (1) | FR2217875B1 (de) |
| GB (1) | GB1465393A (de) |
| IT (1) | IT1019573B (de) |
| NL (1) | NL7401441A (de) |
| NO (1) | NO140401C (de) |
| SE (1) | SE392556B (de) |
| ZA (1) | ZA74916B (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2318247C3 (de) * | 1973-04-11 | 1981-03-26 | Siemens AG, 1000 Berlin und 8000 München | Einrichtung zur verschleierten Übertragung von Sprachsignalen |
| JPS5824984B2 (ja) * | 1976-06-02 | 1983-05-24 | 三菱電機株式会社 | 秘話装置 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1620656A (en) * | 1924-12-01 | 1927-03-15 | Western Electric Co | Carrier-wave signaling system |
| US3201517A (en) * | 1944-04-12 | 1965-08-17 | Bell Telephone Labor Inc | Privacy communication system |
| FR977153A (fr) * | 1948-10-27 | 1951-03-28 | Radio Electr Soc Fr | Système de communication téléphonique à secret |
| FR1169671A (fr) * | 1957-03-08 | 1959-01-05 | Thomson Houston Comp Francaise | Perfectionnements aux systèmes de communications téléphoniques |
| CH361597A (de) * | 1958-08-23 | 1962-04-30 | Patelhold Patentverwertung | Verfahren zur Verschleierung von Nachrichtensignalen |
| US3225142A (en) * | 1961-12-18 | 1965-12-21 | Bell Telephone Labor Inc | Privacy system |
| FR95619E (fr) * | 1966-05-05 | 1971-03-26 | It Telecommunicazioni Siemens | Systeme de transmission de signaux téléphoniques a allocation de temps. |
| CH499932A (de) * | 1968-02-12 | 1970-11-30 | Patelhold Patentverwertung | Synchronisierverfahren für programmgesteuerte Trägerumtastung |
| CH518658A (de) * | 1970-07-07 | 1972-01-31 | Patelhold Patentverwaltungs Un | Verfahren zur verschlüsselten Nachrichtenübermittlung durch zeitliche Vertauschung von Informationselementen |
| FR2129013A5 (de) * | 1971-03-11 | 1972-10-27 | Snecma |
-
1973
- 1973-02-13 CH CH202673A patent/CH574692A5/xx not_active IP Right Cessation
- 1973-04-12 DE DE2318489A patent/DE2318489C3/de not_active Expired
-
1974
- 1974-01-09 SE SE7400265A patent/SE392556B/xx unknown
- 1974-02-01 NL NL7401441A patent/NL7401441A/xx not_active Application Discontinuation
- 1974-02-07 NO NO740416A patent/NO140401C/no unknown
- 1974-02-12 CA CA192,326A patent/CA1003137A/en not_active Expired
- 1974-02-12 FR FR7404708A patent/FR2217875B1/fr not_active Expired
- 1974-02-12 GB GB641174A patent/GB1465393A/en not_active Expired
- 1974-02-12 ZA ZA740916A patent/ZA74916B/xx unknown
- 1974-02-13 JP JP49017525A patent/JPS49119502A/ja active Pending
- 1974-04-08 IT IT20723/74A patent/IT1019573B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| NO140401C (no) | 1979-08-22 |
| GB1465393A (en) | 1977-02-23 |
| IT1019573B (it) | 1977-11-30 |
| FR2217875A1 (de) | 1974-09-06 |
| CH574692A5 (de) | 1976-04-15 |
| NO740416L (no) | 1974-08-14 |
| NL7401441A (de) | 1974-08-15 |
| DE2318489C3 (de) | 1982-12-23 |
| DE2318489A1 (de) | 1974-08-15 |
| JPS49119502A (de) | 1974-11-15 |
| CA1003137A (en) | 1977-01-04 |
| ZA74916B (en) | 1974-12-24 |
| SE392556B (sv) | 1977-03-28 |
| DE2318489B2 (de) | 1979-05-03 |
| NO140401B (no) | 1979-05-14 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |