BE878729A - Circuit de detection de sonnerie utilisable avec un systeme d'evaluation de service - Google Patents

Circuit de detection de sonnerie utilisable avec un systeme d'evaluation de service

Info

Publication number: BE878729A
Authority: BE; Belgium
Prior art keywords: detection circuit; evaluation system; service evaluation; bell detection; bell
Prior art date: 1978-09-13

Application number

BE2/58076A

Other languages

English (en)

Inventor

J S Young

Original Assignee

Gte Automatic Electric Lab Inc

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.)

1978-09-13

Filing date

1979-09-12

Publication date

1979-12-31

1979-09-12 Application filed by Gte Automatic Electric Lab Inc filed Critical Gte Automatic Electric Lab Inc

1979-12-31 Publication of BE878729A publication Critical patent/BE878729A/fr

Links

238000001514 detection method Methods 0.000 title 1
238000011156 evaluation Methods 0.000 title 1

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/0096—Trunk circuits

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Devices For Supply Of Signal Current (AREA)

BE2/58076A 1978-09-13 1979-09-12 Circuit de detection de sonnerie utilisable avec un systeme d'evaluation de service BE878729A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US05/941,993 US4178486A (en)	1978-09-13	1978-09-13	Ring sensing circuit for use with a service evaluation system

Publications (1)

Publication Number	Publication Date
BE878729A true BE878729A (fr)	1979-12-31

Family

ID=25477420

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE2/58076A BE878729A (fr)	1978-09-13	1979-09-12	Circuit de detection de sonnerie utilisable avec un systeme d'evaluation de service

Country Status (3)

Country	Link
US (1)	US4178486A (fr)
BE (1)	BE878729A (fr)
CA (1)	CA1121892A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5838804A (en) *	1996-08-07	1998-11-17	Transcrypt International, Inc.	Apparatus and method for providing proper microphone DC bias current and load resistance for a telephone
US5832076A (en) *	1996-08-07	1998-11-03	Transcrypt International, Inc.	Apparatus and method for determining the presence and polarity of direct current bias voltage for microphones in telephone sets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1221308B (de) *	1964-06-30	1966-07-21	Standard Elektrik Lorenz Ag	Verfahren und Schaltungsanordnung zur Abfrage codierter Gleichstromzeichen an Fernmeldeleitungen
US3653018A (en) *	1970-06-08	1972-03-28	Stromberg Carlson Corp	Monitor circuit

1978
- 1978-09-13 US US05/941,993 patent/US4178486A/en not_active Expired - Lifetime
1979
- 1979-08-10 CA CA000333597A patent/CA1121892A/fr not_active Expired
- 1979-09-12 BE BE2/58076A patent/BE878729A/fr not_active IP Right Cessation

Also Published As

Publication number	Publication date
US4178486A (en)	1979-12-11
CA1121892A (fr)	1982-04-13

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Legal Events

Date

Code

Title

Description

1990-03-31

RE

Patent lapsed

Owner name: GTE AUTOMATIC ELECTRIC LABORATORIES INC.

Effective date: 19890930