GB691237A - Improvements in or relating to voice frequency signalling systems - Google Patents

Improvements in or relating to voice frequency signalling systems

Info

Publication number
GB691237A
GB691237A GB17438/51A GB1743851A GB691237A GB 691237 A GB691237 A GB 691237A GB 17438/51 A GB17438/51 A GB 17438/51A GB 1743851 A GB1743851 A GB 1743851A GB 691237 A GB691237 A GB 691237A
Authority
GB
United Kingdom
Prior art keywords
register
tubes
relay
tube
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.)
Expired
Application number
GB17438/51A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB691237A publication Critical patent/GB691237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • 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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Alarm Systems (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
GB17438/51A 1950-07-21 1951-07-23 Improvements in or relating to voice frequency signalling systems Expired GB691237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE691237X 1950-07-21

Publications (1)

Publication Number Publication Date
GB691237A true GB691237A (en) 1953-05-06

Family

ID=20315203

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17438/51A Expired GB691237A (en) 1950-07-21 1951-07-23 Improvements in or relating to voice frequency signalling systems

Country Status (4)

Country Link
US (1) US2706746A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE886929C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB691237A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (2) NL81161C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001713B (de) * 1953-12-07 1957-01-31 Telefonbau & Normalzeit Gmbh Telefonteilnehmerstation mit tastengesteuerter Frequenzwahl und einem Schichttransistoren enthaltenden Mikrophonverstaerker
NL96910C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1954-10-25
DE1085201B (de) * 1955-01-19 1960-07-14 Josef Dirr Schaltungsanordnung zur Auswertung von ueber abgeriegelte Leitungen uebertragenen, zeitlich versetzten Wechselstromimpulsen einer Frequenz fuer die Identifizierung von Leitungen zur Gebuehrenerfassung in Fernmelde-, insbesondere Fernsprechanlagen
DE1017661B (de) * 1956-01-30 1957-10-17 Telefonbau & Normalzeit Gmbh Einrichtung zur Nummernsendung in Form codifizierter Signale in Fernsprechapparaten
DE1039107B (de) * 1956-06-28 1958-09-18 Standard Elektrik Lorenz Ag Schaltungsanordnung fuer elektrische, ueber Fernleitungen an eine Zentralbatterie angeschlossene Einrichtungen
US3076059A (en) * 1958-06-20 1963-01-29 Bell Telephone Labor Inc Signaling system
CH379584A (de) * 1958-09-03 1964-07-15 Standard Telephon & Radio Ag Elektrische Signalisier-Einrichtung
DE1090273B (de) * 1959-05-09 1960-10-06 Philips Nv Schaltungsanordnung zur Auswertung von Signalen verschiedener Frequenzen in Fernmeldeanlagen
DE1082300B (de) * 1959-06-04 1960-05-25 Siemens Ag Schaltungsanordnung fuer Teilnehmerstellen in Fernmelde-, insbesondere Fernsprech-anlagen mit Tastaturwahl
NL255940A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1959-10-02
DE1152447B (de) * 1960-03-10 1963-08-08 Neumann Elektronik Gmbh Wechsel-Lautsprechanlage mit tongesteuerten Verbindungswegen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250100A (en) * 1939-11-14 1941-07-22 Bell Telephone Labor Inc Signaling system
US2554201A (en) * 1946-06-19 1951-05-22 Ericsson Telefon Ab L M Key-sending automatic telephone signaling system

Also Published As

Publication number Publication date
NL162796B (nl)
NL81161C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
US2706746A (en) 1955-04-19
DE886929C (de) 1953-08-20

Similar Documents

Publication Publication Date Title
GB691237A (en) Improvements in or relating to voice frequency signalling systems
US2568342A (en) Signaling method and system
GB553225A (en) Power line telephone system
US2420232A (en) Signaling system
US1917995A (en) Radio telephony
GB283135A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB646288A (en) Improvements in automatic telephone systems
US3156775A (en) Telephone converter
GB704650A (en) Improvements in or relating to audio-frequency signalling systems
US2387671A (en) Alternating current signal receiver
US3299211A (en) Telephone signal reporting system
US2061227A (en) Signaling system
GB630734A (en) Improvements in or relating to burglar and fire alarm systems
US2306067A (en) Telephone system
GB641345A (en) Improvements in or relating to teleprinter exchange systems
US2393354A (en) Telephone system
GB887275A (en) Improvements in receivers for voice-frequency electric signals
GB726240A (en) Improvements in and relating to high frequency communication systems
US2364068A (en) Remote control system
GB662930A (en) Improvements in or relating to signalling systems
US2193505A (en) Apartment house signaling and telephone system
US1733617A (en) Signaling system
GB321303A (en) Improvements in fire alarm systems in conjunction with telephone exchange systems
GB451495A (en) Improvements in and relating to electrical communication systems
GB417297A (en) Improvements in signalling systems particularly suitable for hospitals, hotels and the like