NL7212139A - - Google Patents
Info
- Publication number
- NL7212139A NL7212139A NL7212139A NL7212139A NL7212139A NL 7212139 A NL7212139 A NL 7212139A NL 7212139 A NL7212139 A NL 7212139A NL 7212139 A NL7212139 A NL 7212139A NL 7212139 A NL7212139 A NL 7212139A
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17800071A | 1971-09-07 | 1971-09-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL7212139A true NL7212139A (it) | 1973-03-09 |
Family
ID=22650774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL7212139A NL7212139A (it) | 1971-09-07 | 1972-09-06 |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS4837003A (it) |
| CH (1) | CH567843A5 (it) |
| DE (1) | DE2243113A1 (it) |
| FR (1) | FR2152161A5 (it) |
| GB (1) | GB1399365A (it) |
| IT (1) | IT972344B (it) |
| NL (1) | NL7212139A (it) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2416597A1 (fr) * | 1971-12-09 | 1979-08-31 | Berger Claude | Procede de codage d'un signal |
| US4167700A (en) * | 1977-05-02 | 1979-09-11 | Motorola, Inc. | Digital voice protection system and method |
| JPS5961242A (ja) * | 1982-09-30 | 1984-04-07 | Fujitsu Ltd | 秘匿通信システム |
| CA1226914A (en) * | 1984-01-26 | 1987-09-15 | The University Of British Columbia | Modem for pseudo noise communication on a.c. lines |
| JPS61199341A (ja) * | 1985-02-28 | 1986-09-03 | Tamura Electric Works Ltd | コ−ドレス電話装置 |
| CN105071886B (zh) * | 2015-08-24 | 2017-12-19 | 苏州华启智能科技有限公司 | 一种车载广播系统音频总线复用系统 |
| US20200361374A1 (en) * | 2017-08-18 | 2020-11-19 | John Hegarty | A device for operating a sounder to produce a plurality of different sounds, and a method for operating a sounder to produce a plurality of different sounds |
-
1972
- 1972-08-21 GB GB3882472A patent/GB1399365A/en not_active Expired
- 1972-08-28 CH CH1268172A patent/CH567843A5/xx not_active IP Right Cessation
- 1972-09-01 DE DE2243113A patent/DE2243113A1/de active Pending
- 1972-09-02 IT IT52512/72A patent/IT972344B/it active
- 1972-09-06 NL NL7212139A patent/NL7212139A/xx not_active Application Discontinuation
- 1972-09-06 FR FR7231624A patent/FR2152161A5/fr not_active Expired
- 1972-09-07 JP JP47089972A patent/JPS4837003A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1399365A (en) | 1975-07-02 |
| IT972344B (it) | 1974-05-20 |
| FR2152161A5 (it) | 1973-04-20 |
| CH567843A5 (it) | 1975-10-15 |
| DE2243113A1 (de) | 1973-03-15 |
| JPS4837003A (it) | 1973-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BV | The patent application has lapsed |