IT1089420B - Rete elettonica per apparecchi telefonici - Google Patents

Rete elettonica per apparecchi telefonici

Info

Publication number
IT1089420B
IT1089420B IT31362/77A IT3136277A IT1089420B IT 1089420 B IT1089420 B IT 1089420B IT 31362/77 A IT31362/77 A IT 31362/77A IT 3136277 A IT3136277 A IT 3136277A IT 1089420 B IT1089420 B IT 1089420B
Authority
IT
Italy
Prior art keywords
electronic network
telephone devices
telephone
devices
network
Prior art date
Application number
IT31362/77A
Other languages
English (en)
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Application granted granted Critical
Publication of IT1089420B publication Critical patent/IT1089420B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6025—Substation equipment, e.g. for use by subscribers including speech amplifiers implemented as integrated speech networks
    • 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)
  • Devices For Supply Of Signal Current (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
IT31362/77A 1977-01-10 1977-12-28 Rete elettonica per apparecchi telefonici IT1089420B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA269,418A CA1056970A (en) 1977-01-10 1977-01-10 Electronic network for telephone set

Publications (1)

Publication Number Publication Date
IT1089420B true IT1089420B (it) 1985-06-18

Family

ID=4107699

Family Applications (1)

Application Number Title Priority Date Filing Date
IT31362/77A IT1089420B (it) 1977-01-10 1977-12-28 Rete elettonica per apparecchi telefonici

Country Status (13)

Country Link
US (1) US4133983A (it)
JP (1) JPS5387604A (it)
CA (1) CA1056970A (it)
DE (1) DE2800875A1 (it)
DK (1) DK9278A (it)
ES (1) ES465856A1 (it)
FI (1) FI773962A (it)
FR (1) FR2377125A1 (it)
GB (1) GB1543300A (it)
IT (1) IT1089420B (it)
NL (1) NL7714174A (it)
NO (1) NO780077L (it)
SE (1) SE414444B (it)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906084C2 (de) * 1979-02-15 1981-10-08 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Schaltungsanordnung zur Übertragung von sprachfrequenten Signalen in Fernsprechanlagen
US4354060A (en) * 1979-07-26 1982-10-12 Stromberg-Carlson Corporation Electronic telephone
DE2946306A1 (de) * 1979-11-16 1981-05-21 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verstaerkerschaltung mit vogebbarem wechselstrominnenwiderstand
US4332984A (en) * 1979-12-13 1982-06-01 Bell Telephone Laboratories, Incorporated Active speech network circuit for a telephone set
FR2487611B1 (fr) * 1980-07-22 1987-10-30 Telephonie Ind Commerciale Circuit d'interface de clavier a frequences vocales
IL63653A (en) * 1980-08-29 1984-05-31 Western Electric Co Line powered transformer-less loudspeaking telephone
US4488006A (en) * 1982-07-01 1984-12-11 At&T Bell Laboratories Apparatus for controlling the application of telephone line power in a telephone set

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462560A (en) * 1966-04-06 1969-08-19 Bell Telephone Labor Inc Subscriber telephone circuit with resistance hybrid sidetone balancing network
BE759917A (fr) * 1969-12-08 1971-05-17 Western Electric Co Reseau a frequence acoustique
US3691311A (en) * 1970-12-10 1972-09-12 Pacific Plantronics Inc Telephone user set
GB1406663A (en) * 1972-08-22 1975-09-17 Standard Telephones Cables Ltd Telphone subset circuits
IT1024530B (it) * 1974-03-21 1978-07-20 Sits Soc It Telecom Siemens Circuito telefonico amplificato senza trasformatore
US3899646A (en) * 1974-05-28 1975-08-12 Bell Telephone Labor Inc Telephone set speech network
SE7415220L (sv) * 1974-12-04 1976-05-17 Ericsson Telefon Ab L M Integrerad forsterkare
US3963876A (en) * 1975-06-30 1976-06-15 Bell Telephone Laboratories, Incorporated Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
US4071713A (en) * 1976-12-27 1978-01-31 Northern Telecom Limited Telephone speech network

Also Published As

Publication number Publication date
DE2800875A1 (de) 1978-07-13
GB1543300A (en) 1979-04-04
NO780077L (no) 1978-07-11
NL7714174A (nl) 1978-07-12
CA1056970A (en) 1979-06-19
FI773962A (fi) 1978-07-11
ES465856A1 (es) 1978-10-01
FR2377125A1 (fr) 1978-08-04
JPS5387604A (en) 1978-08-02
SE414444B (sv) 1980-07-28
SE7800212L (sv) 1978-07-11
US4133983A (en) 1979-01-09
DK9278A (da) 1978-07-11

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