GB1277676A - Voice frequency signalling arrangement - Google Patents

Voice frequency signalling arrangement

Info

Publication number
GB1277676A
GB1277676A GB27396/70A GB2739670A GB1277676A GB 1277676 A GB1277676 A GB 1277676A GB 27396/70 A GB27396/70 A GB 27396/70A GB 2739670 A GB2739670 A GB 2739670A GB 1277676 A GB1277676 A GB 1277676A
Authority
GB
United Kingdom
Prior art keywords
value
voice frequency
impedance resistor
june
sent
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
GB27396/70A
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 GB1277676A publication Critical patent/GB1277676A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Telephonic Communication Services (AREA)
GB27396/70A 1969-06-06 1970-06-05 Voice frequency signalling arrangement Expired GB1277676A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE803369 1969-06-06

Publications (1)

Publication Number Publication Date
GB1277676A true GB1277676A (en) 1972-06-14

Family

ID=20272951

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27396/70A Expired GB1277676A (en) 1969-06-06 1970-06-05 Voice frequency signalling arrangement

Country Status (8)

Country Link
US (1) US3665489A (https=)
CH (1) CH503446A (https=)
DE (1) DE2027508B2 (https=)
DK (1) DK124509B (https=)
FR (1) FR2050060A5 (https=)
GB (1) GB1277676A (https=)
NL (1) NL7008132A (https=)
NO (1) NO126762B (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911223A (en) * 1971-12-02 1975-10-07 Siemens Ag Circuit arrangement for subscriber stations in telecommunications installations, especially telephone installations with auxiliary data traffic
NL7402574A (nl) * 1974-02-26 1975-08-28 Philips Nv Schakeling voor een toondruktoetskeuzetelefoon- toestel.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510536A (https=) * 1951-04-10
NL236432A (https=) * 1958-03-10
NL242923A (https=) * 1958-09-08
DE1201417B (de) * 1964-07-10 1965-09-23 Standard Elektrik Lorenz Ag Tonfrequentes Tastwahlverfahren ohne Gleichstrom-Wahlbegleitzeichen in Fernmelde-, insbesondere Fernsprechanlagen und Schaltungsanordnung zur Durchfuehrung des Verfahrens
US3424870A (en) * 1965-09-14 1969-01-28 Bell Telephone Labor Inc Multifrequency signal generator for tone-dialed telephones
NL6604015A (https=) * 1966-03-26 1967-09-27
FR1525030A (fr) * 1966-07-29 1968-05-17 Cit Alcatel Disposition de clavier pour numérotation par variations d'impédance

Also Published As

Publication number Publication date
US3665489A (en) 1972-05-23
FR2050060A5 (https=) 1971-03-26
NO126762B (https=) 1973-03-19
DE2027508B2 (de) 1972-03-30
DE2027508A1 (https=) 1970-12-10
DK124509B (da) 1972-10-23
NL7008132A (https=) 1970-12-08
CH503446A (de) 1971-02-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees