NL27077C - - Google Patents
Info
- Publication number
- NL27077C NL27077C NL27077DA NL27077C NL 27077 C NL27077 C NL 27077C NL 27077D A NL27077D A NL 27077DA NL 27077 C NL27077 C NL 27077C
- Authority
- NL
- Netherlands
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)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Networks Using Active Elements (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US240116A US1725566A (en) | 1927-12-15 | 1927-12-15 | Secret communication system |
| GB230/28A GB309063A (en) | 1927-12-15 | 1928-01-03 | Improvements in secret electric signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL27077C true NL27077C (en:Method) |
Family
ID=26235775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL27077D NL27077C (en:Method) | 1927-12-15 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1725566A (en:Method) |
| DE (1) | DE542428C (en:Method) |
| GB (1) | GB309063A (en:Method) |
| NL (1) | NL27077C (en:Method) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2495727A (en) * | 1943-01-07 | 1950-01-31 | Hutchinson Henry Parks | Speech privacy apparatus |
| CH246844A (de) * | 1945-09-15 | 1947-01-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung von elektrisch übermittelten Sprachnachrichten. |
| CH248975A (de) * | 1946-02-04 | 1947-05-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung der einzelnen Gespräche einer Mehrkanalanlage. |
| US2574326A (en) * | 1947-12-02 | 1951-11-06 | Rca Corp | Generating groups of currents |
| US3183304A (en) * | 1962-03-07 | 1965-05-11 | Bell Telephone Labor Inc | Sound amplification system |
| DE1273002B (de) * | 1963-09-11 | 1968-07-18 | Siemens Ag | Einrichtung zur verschluesselten UEbertragung von Sprachsignalen durch Vertauschung von Teilbaendern |
| US6047543A (en) * | 1996-12-18 | 2000-04-11 | Litex, Inc. | Method and apparatus for enhancing the rate and efficiency of gas phase reactions |
-
0
- NL NL27077D patent/NL27077C/xx active
-
1927
- 1927-12-15 US US240116A patent/US1725566A/en not_active Expired - Lifetime
-
1928
- 1928-01-03 GB GB230/28A patent/GB309063A/en not_active Expired
- 1928-11-27 DE DEI36222D patent/DE542428C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB309063A (en) | 1929-04-03 |
| DE542428C (de) | 1932-01-27 |
| US1725566A (en) | 1929-08-20 |