IT972344B - Unita di segretezza in fonia per impianti di intercomunicazione - Google Patents
Unita di segretezza in fonia per impianti di intercomunicazioneInfo
- Publication number
- IT972344B IT972344B IT52512/72A IT5251272A IT972344B IT 972344 B IT972344 B IT 972344B IT 52512/72 A IT52512/72 A IT 52512/72A IT 5251272 A IT5251272 A IT 5251272A IT 972344 B IT972344 B IT 972344B
- Authority
- IT
- Italy
- Prior art keywords
- secretity
- phony
- unit
- intercom systems
- intercom
- Prior art date
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 |
|---|---|
| IT972344B true IT972344B (it) | 1974-05-20 |
Family
ID=22650774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT52512/72A IT972344B (it) | 1971-09-07 | 1972-09-02 | Unita di segretezza in fonia per impianti di intercomunicazione |
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 |
| NL7212139A (it) | 1973-03-09 |
| FR2152161A5 (it) | 1973-04-20 |
| CH567843A5 (it) | 1975-10-15 |
| DE2243113A1 (de) | 1973-03-15 |
| JPS4837003A (it) | 1973-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| IT947890B (it) | Unita di controllo di cominica zione | |
| IT996047B (it) | Perfezionamento nei sistemi di scambio termico | |
| IT958071B (it) | Impianto di visualizzazione termica | |
| AT341759B (de) | Verbindungssystem | |
| DE2352359A1 (de) | Steckbausystem | |
| IT952302B (it) | Perfezionamento negli impianti motori per autoveicoli | |
| AT307656B (de) | Systembauteil | |
| IT969932B (it) | Sistema di elaborazione con unita previste in triplo | |
| IT966873B (it) | Perfezionamento negli impianti di aerazione per ambienti | |
| IT966817B (it) | Attacco per contraghi in scambi di impianti di binari | |
| IT968564B (it) | Sistema per installare impianti elettrici in edifici | |
| IT972344B (it) | Unita di segretezza in fonia per impianti di intercomunicazione | |
| AT303077B (de) | Kesselsystem | |
| IT952416B (it) | Perfezionamento negli impianti automatici per fotografia | |
| CA919488A (en) | Exhaust systems | |
| IT959267B (it) | Sistema di telecomunicazioni in multiplex estensibile | |
| ZA713666B (en) | Improvements in or relating to programme-controlled exchange systems | |
| CH530810A (de) | Entschäumer | |
| SE387027B (sv) | Anordning vid tvaradiesystem | |
| IT970249B (it) | Ugello di lavaggio in particolare per impianti di lavaggio di vetri di autoveicoli | |
| IT940536B (it) | Unita di costruzione | |
| TR17298A (tr) | Katalizatoer sistemleri | |
| CH503243A (de) | Plattenheizkörper | |
| CH534034A (de) | Putzanlage | |
| BE776082A (fr) | Rallonge enfichable pour outils |