GB514520A - Improvements in or relating to alternating current signalling systems - Google Patents

Improvements in or relating to alternating current signalling systems

Info

Publication number
GB514520A
GB514520A GB13664/38A GB1366438A GB514520A GB 514520 A GB514520 A GB 514520A GB 13664/38 A GB13664/38 A GB 13664/38A GB 1366438 A GB1366438 A GB 1366438A GB 514520 A GB514520 A GB 514520A
Authority
GB
United Kingdom
Prior art keywords
frequency
signals
impulses
rectifier
condenser
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
GB13664/38A
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.)
Individual
Original Assignee
Individual
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
Priority to BE434099D priority Critical patent/BE434099A/xx
Priority to NL64018D priority patent/NL64018C/xx
Priority to NL93258D priority patent/NL93258C/xx
Application filed by Individual filed Critical Individual
Priority to GB13664/38A priority patent/GB514520A/en
Priority to US269524A priority patent/US2282129A/en
Publication of GB514520A publication Critical patent/GB514520A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
    • C07D213/86—Hydrazides; Thio or imino analogues thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electrotherapy Devices (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
GB13664/38A 1938-05-07 1938-05-07 Improvements in or relating to alternating current signalling systems Expired GB514520A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE434099D BE434099A (enrdf_load_stackoverflow) 1938-05-07
NL64018D NL64018C (enrdf_load_stackoverflow) 1938-05-07
NL93258D NL93258C (enrdf_load_stackoverflow) 1938-05-07
GB13664/38A GB514520A (en) 1938-05-07 1938-05-07 Improvements in or relating to alternating current signalling systems
US269524A US2282129A (en) 1938-05-07 1939-04-22 Alternating current signaling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13664/38A GB514520A (en) 1938-05-07 1938-05-07 Improvements in or relating to alternating current signalling systems

Publications (1)

Publication Number Publication Date
GB514520A true GB514520A (en) 1939-11-10

Family

ID=10027155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13664/38A Expired GB514520A (en) 1938-05-07 1938-05-07 Improvements in or relating to alternating current signalling systems

Country Status (4)

Country Link
US (1) US2282129A (enrdf_load_stackoverflow)
BE (1) BE434099A (enrdf_load_stackoverflow)
GB (1) GB514520A (enrdf_load_stackoverflow)
NL (2) NL64018C (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB654639A (en) * 1947-02-07 1951-06-27 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
NL81147C (enrdf_load_stackoverflow) * 1951-04-27
JPS5340824A (en) * 1976-09-27 1978-04-13 Hitachi Ltd Combining circuit

Also Published As

Publication number Publication date
BE434099A (enrdf_load_stackoverflow)
NL64018C (enrdf_load_stackoverflow)
US2282129A (en) 1942-05-05
NL93258C (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
GB593731A (en) Receivers for pulse communication systems
GB587941A (en) Improvements relating to multi-channel electrical pulse communication systems
GB514520A (en) Improvements in or relating to alternating current signalling systems
GB526211A (en) Methods and systems for television communication
GB567874A (en) Improvements in or relating to telecommunication exchange systems
GB560807A (en) Improvements in telephone or like systems
US1698770A (en) Signaling circuits
GB541731A (en) Improvements in and relating to telephone and like systems
GB855376A (en) Improvements in or relating to electric pulse lengthening circuits including transistors
US2094108A (en) Electrical signaling system
GB636253A (en) Pulse receiving and repeating systems for telecommunication networks
GB622174A (en) Improvements in or relating to control circuits for grid-controlled gaseous discharge tubes
GB495162A (en) Improvements in and relating to alternating current signalling systems
GB704922A (en) Improvements in or relating to voice frequency signal receivers
GB593101A (en) Improvements in or relating to electric pulse modulating circuits
GB704749A (en) Improvements in or relating to the metering circuits of telephone systems
GB370248A (en) Improvements in electrostatic loud-speakers
GB560132A (en) Improvements in or relating to telephone systems
GB502584A (en) Improvements in or relating to carrier telephony systems
GB657554A (en) Receiver for pulse modulated carrier signals
GB385974A (en) Improvements relating to thermionic relay circuits
GB697280A (en) Method of and device for signalling in pulse communication system
GB554367A (en) Inductance apparatus
GB651461A (en) Improvements in or relating to alternating current signalling systems
GB482241A (en) Improvements in or relating to carrier telephony systems