CA1081875A - Digital measurement of the dc value in an ac signal adapted to telephone off-hook detection - Google Patents
Digital measurement of the dc value in an ac signal adapted to telephone off-hook detectionInfo
- Publication number
- CA1081875A CA1081875A CA293,003A CA293003A CA1081875A CA 1081875 A CA1081875 A CA 1081875A CA 293003 A CA293003 A CA 293003A CA 1081875 A CA1081875 A CA 1081875A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- output
- counter
- hook
- input signal
- 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
Links
- 238000001514 detection method Methods 0.000 title abstract description 5
- 238000005259 measurement Methods 0.000 title abstract 3
- 230000004044 response Effects 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 2
- 239000000306 component Substances 0.000 claims 5
- 230000002844 continuous effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001465 metallisation Methods 0.000 description 3
- 239000002674 ointment Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010252 digital analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/026—Arrangements for interrupting the ringing current
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/792,079 US4132864A (en) | 1977-04-28 | 1977-04-28 | Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection |
| US792,079 | 1977-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1081875A true CA1081875A (en) | 1980-07-15 |
Family
ID=25155731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA293,003A Expired CA1081875A (en) | 1977-04-28 | 1977-12-13 | Digital measurement of the dc value in an ac signal adapted to telephone off-hook detection |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4132864A (https=) |
| JP (1) | JPS53135504A (https=) |
| CA (1) | CA1081875A (https=) |
| DE (1) | DE2816981A1 (https=) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4211896A (en) * | 1977-10-17 | 1980-07-08 | Telecommunications Radioelectrique Et Telephoniques T.R.T. | Subscriber's circuit with a symmetrical amplifier |
| US4447673A (en) * | 1977-12-27 | 1984-05-08 | Stromberg-Carlson Corporation | Ring trip apparatus for a line circuit connected to DCO switch |
| DE3036686C2 (de) * | 1980-09-29 | 1983-12-01 | Siemens AG, 1000 Berlin und 8000 München | Teilnehmeranschlußschaltung |
| US4363127A (en) * | 1981-01-12 | 1982-12-07 | Ford Aerospace & Communications Corporation | Line signaling apparatus and techniques for digital data links |
| US4429185A (en) | 1981-12-21 | 1984-01-31 | Bell Telephone Laboratories, Incorporated | Voltage detector circuit |
| IT1155661B (it) * | 1982-03-24 | 1987-01-28 | Cselt Centro Studi Lab Telecom | Circuito elettronico per la rivelazione dello sgancio del microtelefono in presenza della corrente di chiamata |
| US4455456A (en) * | 1982-04-26 | 1984-06-19 | International Telephone And Telegraph Corporation | Digital supervisory circuit for a telephone system |
| FR2531296B1 (fr) * | 1982-07-30 | 1988-04-15 | Cit Alcatel | Procede et dispositif de detection de boucle en phase sonnerie |
| FR2553893B1 (fr) * | 1983-10-19 | 1986-02-07 | Texas Instruments France | Procede et dispositif de detection d'une transition de la composante continue d'un signal periodique, notamment pour joncteur telephonique |
| US4958371A (en) * | 1988-04-19 | 1990-09-18 | Control Data Corporation | Method and apparatus for determining when a telephone handset is off-hook |
| US5526420A (en) * | 1990-08-03 | 1996-06-11 | Canon Kabushiki Kaisha | Communication apparatus |
| US5287404A (en) * | 1990-12-20 | 1994-02-15 | Northern Telecom Limited | Telephone subscriber line voltage change detection |
| SE9400186D0 (sv) * | 1994-01-21 | 1994-01-21 | Ericsson Telefon Ab L M | Förfarande i ett telekommunikationssystem |
| JP2000516358A (ja) | 1995-12-22 | 2000-12-05 | トムソン コンシユーマ エレクトロニクス インコーポレイテツド | Ｉｒ受信器と電子機器との間の電気的絶縁装置 |
| US5663878A (en) * | 1996-03-21 | 1997-09-02 | Unitrode Corporation | Apparatus and method for generating a low frequency AC signal |
| SE511917C2 (sv) * | 1996-12-10 | 1999-12-13 | Ericsson Telefon Ab L M | Förfarande för anordning för att detektera en ringbortkoppling |
| US6115469A (en) * | 1998-08-25 | 2000-09-05 | Unitrode Corporation | Telephone line ring signal and DC power generator |
| CA2289383C (en) * | 1999-11-12 | 2009-02-03 | Martin Bijman | A system and method for detecting an off-hook condition |
| US6376933B1 (en) | 1999-12-31 | 2002-04-23 | Honeywell International Inc. | Magneto-resistive signal isolator |
| US6618473B1 (en) * | 2001-07-06 | 2003-09-09 | Dasym Technologies, Inc. | Telephone caller screening device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3735263A (en) * | 1972-07-12 | 1973-05-22 | Northeast Electronics Corp | Digital analysis of electric wave signals |
| US3851108A (en) * | 1972-12-20 | 1974-11-26 | Bell Lab Inc | Communication line supervisory circuit |
-
1977
- 1977-04-28 US US05/792,079 patent/US4132864A/en not_active Expired - Lifetime
- 1977-12-13 CA CA293,003A patent/CA1081875A/en not_active Expired
-
1978
- 1978-03-07 JP JP2508478A patent/JPS53135504A/ja active Granted
- 1978-04-19 DE DE19782816981 patent/DE2816981A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6113423B2 (https=) | 1986-04-14 |
| DE2816981A1 (de) | 1978-11-02 |
| JPS53135504A (en) | 1978-11-27 |
| US4132864A (en) | 1979-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |