GB532597A - Improvements in telephony - Google Patents
Improvements in telephonyInfo
- Publication number
- GB532597A GB532597A GB25503/39A GB2550339A GB532597A GB 532597 A GB532597 A GB 532597A GB 25503/39 A GB25503/39 A GB 25503/39A GB 2550339 A GB2550339 A GB 2550339A GB 532597 A GB532597 A GB 532597A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- valve
- receiving
- rectifiers
- sept
- 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.)
- Expired
Links
- 230000003111 delayed effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
- Meter Arrangements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN42451A DE722560C (de) | 1938-09-12 | 1938-09-12 | Signalempfaenger |
Publications (1)
Publication Number | Publication Date |
---|---|
GB532597A true GB532597A (en) | 1941-01-28 |
Family
ID=27797497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25503/39A Expired GB532597A (en) | 1938-09-12 | 1939-09-09 | Improvements in telephony |
Country Status (6)
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2440049A (en) * | 1945-06-30 | 1948-04-20 | Rca Corp | Electronic audio switch |
US2490243A (en) * | 1947-06-12 | 1949-12-06 | Philco Corp | Electronic cycle counting circuit |
US3611940A (en) * | 1948-02-27 | 1971-10-12 | Us Navy | Simplified proximity fuze and/or howitzer shells |
US2681386A (en) * | 1948-07-13 | 1954-06-15 | Automatic Telephone & Elect | Electrical signaling system using nonlinear resistors for control |
US2801290A (en) * | 1951-09-17 | 1957-07-30 | Telefunken Gmbh | Calling signal responder arrangements |
DE1053579B (de) * | 1954-05-17 | 1959-03-26 | Telefunken Gmbh | Schaltungsanordnung fuer die Herstellung von Verbindungen in Fernmelde- und Fernsteueranlagen |
US2830128A (en) * | 1954-12-21 | 1958-04-08 | Itt | Condenser-timed delayed signal repeater |
US3048660A (en) * | 1958-07-31 | 1962-08-07 | Bell Telephone Labor Inc | Telephone pay station system |
-
1938
- 1938-09-12 DE DEN42451A patent/DE722560C/de not_active Expired
-
1939
- 1939-09-09 GB GB25503/39A patent/GB532597A/en not_active Expired
- 1939-09-11 NL NL95180A patent/NL54271C/xx active
- 1939-09-12 BE BE436359D patent/BE436359A/xx unknown
- 1939-10-02 US US297576A patent/US2336768A/en not_active Expired - Lifetime
- 1939-12-15 FR FR862367D patent/FR862367A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR862367A (fr) | 1941-03-05 |
US2336768A (en) | 1943-12-14 |
DE722560C (de) | 1943-05-20 |
BE436359A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1939-10-31 |
NL54271C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1943-04-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB532597A (en) | Improvements in telephony | |
US2319306A (en) | Signaling system | |
GB444454A (en) | Improvements in and relating to impulse generators employing electric discharge devices | |
GB537558A (en) | Linear thermionic amplifying systems | |
GB514509A (en) | Improvements in or relating to synchronising impulse separator circuits for use in television receivers | |
GB422906A (en) | Improvements in and relating to signalling systems, such for example as television systems | |
GB515208A (en) | Improvements in or relating to the elimination of undesired electrical signals | |
GB498413A (en) | Frequency-reducing valve circuits | |
GB723061A (en) | Improvements in or relating to signal receivers | |
GB495162A (en) | Improvements in and relating to alternating current signalling systems | |
US1872940A (en) | Relay receiving circuit for carrier telegraph signals | |
GB487488A (en) | Improvements in signal receiving apparatus for telephone systems | |
GB385974A (en) | Improvements relating to thermionic relay circuits | |
US2300875A (en) | Radio receiving system | |
US2249503A (en) | Audio frequency doubler | |
GB464810A (en) | Improvements in or relating to synchronising means in television transmitters and the like | |
GB389970A (en) | Improvements in electric signalling circuits with thermionic valves | |
GB453254A (en) | Improvements in or relating to telegraph signalling systems | |
GB552943A (en) | Wave amplitude limiting device for signal transmission systems | |
GB436856A (en) | Improvements in and relating to radio receivers | |
GB519530A (en) | Improvements in and relating to noise limiting circuits for use in electric transmission systems | |
GB398813A (en) | Improvements in or relating to electrical signalling systems | |
GB553935A (en) | Improvements in or relating to voice-frequency signalling systems | |
GB529020A (en) | Improvements in or relating to electrical signalling systems | |
GB494099A (en) | Improvements in or relating to telegraph systems |