GB887276A - Improvements in arrangements for sending voice-frequency signals - Google Patents

Improvements in arrangements for sending voice-frequency signals

Info

Publication number
GB887276A
GB887276A GB7798/58A GB779858A GB887276A GB 887276 A GB887276 A GB 887276A GB 7798/58 A GB7798/58 A GB 7798/58A GB 779858 A GB779858 A GB 779858A GB 887276 A GB887276 A GB 887276A
Authority
GB
United Kingdom
Prior art keywords
line
arrangements
frequency signals
handset
march
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
GB7798/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB887276A publication Critical patent/GB887276A/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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • 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)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
GB7798/58A 1957-03-14 1958-03-11 Improvements in arrangements for sending voice-frequency signals Expired GB887276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL215381 1957-03-14

Publications (1)

Publication Number Publication Date
GB887276A true GB887276A (en) 1962-01-17

Family

ID=19750844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7798/58A Expired GB887276A (en) 1957-03-14 1958-03-11 Improvements in arrangements for sending voice-frequency signals

Country Status (6)

Country Link
US (1) US2951911A (en:Method)
BE (1) BE565637A (en:Method)
CH (1) CH363062A (en:Method)
DE (1) DE1050835B (en:Method)
GB (1) GB887276A (en:Method)
NL (2) NL215381A (en:Method)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH379584A (de) * 1958-09-03 1964-07-15 Standard Telephon & Radio Ag Elektrische Signalisier-Einrichtung
US3060275A (en) * 1958-11-07 1962-10-23 Bell Telephone Labor Inc Telephone system signaling
DE1082300B (de) * 1959-06-04 1960-05-25 Siemens Ag Schaltungsanordnung fuer Teilnehmerstellen in Fernmelde-, insbesondere Fernsprech-anlagen mit Tastaturwahl
GB961545A (en:Method) * 1959-10-02
GB956356A (en) * 1960-07-21 1964-04-22 Standard Telephones Cables Ltd Improvements in or relating to signalling methods between subscriber's sets and exchage
US3187107A (en) * 1960-03-04 1965-06-01 Int Standard Electric Corp Voice-frequency key-dialing subscriber's station
US3183454A (en) * 1961-04-24 1965-05-11 Autophon Ag Circuit for providing sequences of pulses and intervals
NL297125A (en:Method) * 1962-10-05
DE1185665B (de) * 1963-09-14 1965-01-21 Standard Elektrik Lorenz Ag Tastengesteuerter Mehrfrequenz-Tongenerator
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
US3691300A (en) * 1965-06-30 1972-09-12 Ibm Tone controlled dictation apparatus
CA947444A (en) * 1972-04-17 1974-05-14 Bell Canada Telephone substation apparatus
US3899638A (en) * 1973-10-29 1975-08-12 Interface Technology Inc Portable tone data transmitter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE512760A (en:Method) * 1951-07-13

Also Published As

Publication number Publication date
NL215381A (en:Method)
BE565637A (en:Method)
DE1050835B (en:Method) 1959-02-19
NL100359C (en:Method)
CH363062A (de) 1962-07-15
US2951911A (en) 1960-09-06

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