CA1026477A - Symmetric resistive hybrid telephone circuit - Google Patents

Symmetric resistive hybrid telephone circuit

Info

Publication number: CA1026477A
Authority: CA; Canada
Prior art keywords: telephone circuit; hybrid telephone; symmetric resistive; resistive hybrid; symmetric
Prior art date: 1974-03-21
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

CA222,820A

Other languages

English (en)

French (fr)

Inventor

Roberto Pipitone

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.)

1974-03-21

Filing date

1975-03-21

Publication date

1978-02-14

1975-03-21 Application filed by Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA

1978-02-14 Application granted granted Critical

1978-02-14 Publication of CA1026477A publication Critical patent/CA1026477A/en

Status 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)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Coils Or Transformers For Communication (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)

CA222,820A 1974-03-21 1975-03-21 Symmetric resistive hybrid telephone circuit Expired CA1026477A (en)

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 (1)

Publication Number	Publication Date
CA1026477A true CA1026477A (en)	1978-02-14

Family

ID=11306120

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA222,820A Expired CA1026477A (en)	1974-03-21	1975-03-21	Symmetric resistive hybrid telephone circuit

Country Status (6)

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

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 (it) *	1970-04-10	1971-12-22

1974
- 1974-03-21 IT IT67890/74A patent/IT1024529B/it active
1975
- 1975-01-21 FR FR7501840A patent/FR2265233B1/fr not_active Expired
- 1975-02-06 CH CH145075A patent/CH579335A5/xx not_active IP Right Cessation
- 1975-03-20 US US05/560,517 patent/US3987253A/en not_active Expired - Lifetime
- 1975-03-21 DE DE2512562A patent/DE2512562B2/de not_active Ceased
- 1975-03-21 CA CA222,820A patent/CA1026477A/en not_active Expired

Also Published As

Publication number	Publication date
FR2265233B1 (it)	1979-04-27
FR2265233A1 (it)	1975-10-17
DE2512562A1 (de)	1975-10-02
IT1024529B (it)	1978-07-20
DE2512562B2 (de)	1980-04-24
US3987253A (en)	1976-10-19
CH579335A5 (it)	1976-08-31

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