DE1208360B - Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen - Google Patents
Schaltungsanordnung zur Verhinderung des Abhoerens von GespraechenInfo
- Publication number
- DE1208360B DE1208360B DEST21984A DEST021984A DE1208360B DE 1208360 B DE1208360 B DE 1208360B DE ST21984 A DEST21984 A DE ST21984A DE ST021984 A DEST021984 A DE ST021984A DE 1208360 B DE1208360 B DE 1208360B
- Authority
- DE
- Germany
- Prior art keywords
- circuit arrangement
- arrangement according
- switching means
- circuit
- subscriber line
- Prior art date
- 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.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- QEIQEORTEYHSJH-UHFFFAOYSA-N Armin Natural products C1=CC(=O)OC2=C(O)C(OCC(CCO)C)=CC=C21 QEIQEORTEYHSJH-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1050045D GB1050045A (enrdf_load_stackoverflow) | 1964-04-17 | ||
| DEST21984A DE1208360B (de) | 1964-04-17 | 1964-04-17 | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEST21984A DE1208360B (de) | 1964-04-17 | 1964-04-17 | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1208360B true DE1208360B (de) | 1966-01-05 |
Family
ID=7459196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEST21984A Pending DE1208360B (de) | 1964-04-17 | 1964-04-17 | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1208360B (enrdf_load_stackoverflow) |
| GB (1) | GB1050045A (enrdf_load_stackoverflow) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842216A (en) * | 1972-08-07 | 1974-10-15 | Ford Ind Inc | Frequency-selective ringing current sensor for telephone line |
-
0
- GB GB1050045D patent/GB1050045A/en active Active
-
1964
- 1964-04-17 DE DEST21984A patent/DE1208360B/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1050045A (enrdf_load_stackoverflow) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2645087A1 (de) | Nebenanschlussystem fuer fernsprecher | |
| US1483172A (en) | Signaling system | |
| DE1208360B (de) | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen | |
| US3306984A (en) | Elimination of talk-off in in-band signaling systems | |
| US2041964A (en) | Telephone system | |
| US3626101A (en) | Loop extender for subscribers connected to a central office by abnormally long telephone lines | |
| US2786099A (en) | Sound amplifying apparatus for telephone circuits | |
| DE1226650B (de) | Verfahren und Schaltungsanordnung zur Verbindung von Teilnehmerstationen mit deren Handapparaten in Fernsprechanlagen | |
| USRE23057E (en) | atkins | |
| DE2826671C3 (de) | Schaltungsanordnung für einen Fernsprechapparat mit einer Freisprecheinrichtung | |
| DE2332244A1 (de) | Anrufbeantwortungsanordnung | |
| DE3789796T2 (de) | Heuler für schnurloses Fernsprechsystem. | |
| DE2855971A1 (de) | Telefonkontrollschaltung | |
| US2885477A (en) | Exclusion arrangement for loudspeaking telephone systems | |
| US2381986A (en) | Communication apparatus | |
| US1196761A (en) | Telephone system. | |
| US1026328A (en) | Telephone system. | |
| US2332551A (en) | Telephone set circuit | |
| JPS60169263A (ja) | 遠隔制御方式 | |
| DE2723745A1 (de) | Schaltungsanordnung zur akustischen raumueberwachung mit anschluss an das fernsprechnetz | |
| DE2036473C3 (de) | Schaltungsanordnung zur Veranlassung einer akustischen Rückkopplung in Wechsel- und Gegensprechanlagen | |
| US2345046A (en) | Intercommunicating system | |
| US2177512A (en) | Electric communication system | |
| DE2351218A1 (de) | Telefonanrufbeantworter fuer nebenstellananlagen | |
| US1407046A (en) | Telephone apparatus |