GB503497A - Improvements in or relating to electrical signalling systems - Google Patents

Improvements in or relating to electrical signalling systems

Info

Publication number
GB503497A
GB503497A GB26971/37A GB2697137A GB503497A GB 503497 A GB503497 A GB 503497A GB 26971/37 A GB26971/37 A GB 26971/37A GB 2697137 A GB2697137 A GB 2697137A GB 503497 A GB503497 A GB 503497A
Authority
GB
United Kingdom
Prior art keywords
circuit
cycles
voltage
cycle
rectified
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
Application number
GB26971/37A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Publication of GB503497A publication Critical patent/GB503497A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
GB26971/37A 1936-11-14 1937-10-05 Improvements in or relating to electrical signalling systems Expired GB503497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US110864A US2159081A (en) 1936-11-14 1936-11-14 Telephone system

Publications (1)

Publication Number Publication Date
GB503497A true GB503497A (en) 1939-04-05

Family

ID=27788412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26971/37A Expired GB503497A (en) 1936-11-14 1937-10-05 Improvements in or relating to electrical signalling systems

Country Status (3)

Country Link
US (1) US2159081A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE424612A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB503497A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482478A (en) * 1947-03-29 1949-09-20 Automatic Elect Lab Tone unit
BE499462A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1949-11-22

Also Published As

Publication number Publication date
BE424612A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
US2159081A (en) 1939-05-23

Similar Documents

Publication Publication Date Title
US2361585A (en) Radio warning system
US2535104A (en) Selective signaling equipment only operative by two-voice frequencies
US2118917A (en) Dual tone telegraphy system
US2086602A (en) Modulating system
GB503497A (en) Improvements in or relating to electrical signalling systems
US2290570A (en) Telephone and like system
US2572074A (en) Voice-frequency signaling system
US2676204A (en) Pulse demodulating circuit
US3593035A (en) Marginal switching arrangement
US2719289A (en) Electrical conversion system with high and low voltage alarm
GB552062A (en) Improvements in or relating to electrical impulse transmission
US2515553A (en) Communication system and signal receiver therefor
US2029354A (en) Electrical amplifier
US1696274A (en) Substation circuits
US1872940A (en) Relay receiving circuit for carrier telegraph signals
GB509866A (en) Improvements in or relating to devices for the selective remote control of independent mechanisms
US2282377A (en) Control means for railway train communication apparatus
GB483576A (en) Improvements in or relating to radio and other modulated carrier wave transmitters
US1911133A (en) Self-biasing relay circuit
US2307834A (en) Signaling system
US2661395A (en) Variable resistance signaling system
US2498680A (en) Alternating current signaling system
GB495162A (en) Improvements in and relating to alternating current signalling systems
GB468756A (en) Improvements in or relating to modulated carrier-wave transmitters
DE857084C (de) Signalempfaenger