FR2265233B1 - - Google Patents

Info

Publication number
FR2265233B1
FR2265233B1 FR7501840A FR7501840A FR2265233B1 FR 2265233 B1 FR2265233 B1 FR 2265233B1 FR 7501840 A FR7501840 A FR 7501840A FR 7501840 A FR7501840 A FR 7501840A FR 2265233 B1 FR2265233 B1 FR 2265233B1
Authority
FR
France
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
FR7501840A
Other versions
FR2265233A1 (fr
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.)
Italtel SpA
Original Assignee
Societa Italiana Telecomunicazioni Siemens SpA
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 Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA
Publication of FR2265233A1 publication Critical patent/FR2265233A1/fr
Application granted granted Critical
Publication of FR2265233B1 publication Critical patent/FR2265233B1/fr
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
    • H04M1/58—Anti-side-tone circuits
    • H04M1/585—Anti-side-tone circuits implemented without inductive element

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Coils Or Transformers For Communication (AREA)
FR7501840A 1974-03-21 1975-01-21 Expired FR2265233B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67890/74A IT1024529B (it) 1974-03-21 1974-03-21 Forchetta telefonica simmetrica

Publications (2)

Publication Number Publication Date
FR2265233A1 FR2265233A1 (fr) 1975-10-17
FR2265233B1 true FR2265233B1 (fr) 1979-04-27

Family

ID=11306120

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7501840A Expired FR2265233B1 (fr) 1974-03-21 1975-01-21

Country Status (6)

Country Link
US (1) US3987253A (fr)
CA (1) CA1026477A (fr)
CH (1) CH579335A5 (fr)
DE (1) DE2512562B2 (fr)
FR (1) FR2265233B1 (fr)
IT (1) IT1024529B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048647A (en) * 1976-09-10 1977-09-13 Northern Telecom Limited Solid state disconnect device
IT1110111B (it) * 1979-01-12 1985-12-23 Acet Srl Impianto citofonico a portiere elettrico a due fili,suscettibile di utilizzare un pressistente impianto a campanello,senza necessita' di ulteriori linee di alimentazione
DE3309822C2 (de) * 1983-03-18 1985-11-14 Siemens AG, 1000 Berlin und 8000 München Gabelschaltung für eine zentralgespeiste Teilnehmerstation
US4598396A (en) * 1984-04-03 1986-07-01 Itt Corporation Duplex transmission mechanism for digital telephones
JPH03296359A (ja) * 1990-04-16 1991-12-27 Fujitsu Ltd Ｉｓｄｎインタフェース回路

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033940A (en) * 1960-09-09 1962-05-08 Itt Operator telephone circuit
US3440367A (en) * 1966-05-06 1969-04-22 Bell Telephone Labor Inc Nonreactive antisidetone network for a telephone set
DE1919111B1 (de) * 1969-04-15 1970-10-29 Siemens Ag Schaltungsanordnung fuer einen Transistorhoerverstaerker mit Daempfungsausgleich in Fernsprechteilnehmerstellen
GB1257878A (fr) * 1970-04-10 1971-12-22

Also Published As

Publication number Publication date
IT1024529B (it) 1978-07-20
DE2512562A1 (de) 1975-10-02
US3987253A (en) 1976-10-19
DE2512562B2 (de) 1980-04-24
CA1026477A (fr) 1978-02-14
FR2265233A1 (fr) 1975-10-17
CH579335A5 (fr) 1976-08-31

Similar Documents

Publication Publication Date Title
FR2264909A1 (fr)
FR2290207B1 (fr)
FI750160A (fr)
FR2265233B1 (fr)
FR2262283A1 (fr)
DK99074A (fr)
DE2437247A1 (fr)
CH562462A5 (fr)
CH1163975A4 (fr)
DD113316A2 (fr)
DD109308A1 (fr)
CH586770A5 (fr)
CH574312A5 (fr)
CH569666A5 (fr)
CH569220A5 (fr)
CH568539A5 (fr)
CH568134A5 (fr)
CH566915A5 (fr)
CH566410A5 (fr)
AU479931A (fr)
CH564833A5 (fr)
CH563933A5 (fr)
CH562521A5 (fr)
BG22586A1 (fr)
CH41675A4 (fr)

Legal Events

Date Code Title Description
ST Notification of lapse