IN155829B - - Google Patents
Info
- Publication number
- IN155829B IN155829B IN2274/CAL/76A IN2274CA1976A IN155829B IN 155829 B IN155829 B IN 155829B IN 2274CA1976 A IN2274CA1976 A IN 2274CA1976A IN 155829 B IN155829 B IN 155829B
- Authority
- IN
- India
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Noise Elimination (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Radar Systems Or Details Thereof (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7603136A SE397763B (sv) | 1976-03-09 | 1976-03-09 | Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IN155829B true IN155829B (en:Method) | 1985-03-16 |
Family
ID=20327272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IN2274/CAL/76A IN155829B (en:Method) | 1976-03-09 | 1976-12-28 |
Country Status (22)
| Country | Link |
|---|---|
| US (1) | US4107475A (en:Method) |
| AR (1) | AR213111A1 (en:Method) |
| AU (1) | AU501585B2 (en:Method) |
| BR (1) | BR7700987A (en:Method) |
| CA (1) | CA1064633A (en:Method) |
| DE (1) | DE2702026C2 (en:Method) |
| DK (1) | DK142719B (en:Method) |
| EG (1) | EG13315A (en:Method) |
| ES (1) | ES456619A1 (en:Method) |
| FI (1) | FI60802C (en:Method) |
| FR (1) | FR2344190A1 (en:Method) |
| GB (1) | GB1544174A (en:Method) |
| HU (1) | HU176229B (en:Method) |
| IE (1) | IE45187B1 (en:Method) |
| IN (1) | IN155829B (en:Method) |
| IT (1) | IT1085209B (en:Method) |
| MY (1) | MY8000166A (en:Method) |
| NL (1) | NL186486C (en:Method) |
| NO (1) | NO140085C (en:Method) |
| SE (1) | SE397763B (en:Method) |
| SU (1) | SU656562A3 (en:Method) |
| YU (1) | YU41466B (en:Method) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4227055A (en) * | 1978-12-07 | 1980-10-07 | Bell Telephone Laboratories, Incorporated | Multifrequency receiver |
| US4395595A (en) * | 1980-04-23 | 1983-07-26 | Nippon Electric Co., Ltd. | Digital pushbutton signalling receiver |
| US4385208A (en) * | 1981-04-15 | 1983-05-24 | Bell Telephone Laboratories, Incorporated | Multifrequency receiver |
| US4489280A (en) * | 1982-07-15 | 1984-12-18 | Sperry Corporation | Signal harmonic processor |
| US4599495A (en) * | 1985-02-28 | 1986-07-08 | Northern Telecom Limited | Apparatus for multifrequency signalling tone detection |
| DE3710695A1 (de) * | 1987-03-31 | 1988-10-20 | Nixdorf Computer Ag | Schaltungsanordnung zum erkennen von doppelton-mehrfrequenzsignalen in fernsprechanlagen |
| US20080068132A1 (en) * | 2006-05-16 | 2008-03-20 | Georges Kayanakis | Contactless radiofrequency device featuring several antennas and related antenna selection circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1487973B2 (de) * | 1966-05-12 | 1970-10-08 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung für einen sprachgeschützten Ein- oder Mehrfrequenz-Signalempfänger |
| GB1342904A (en) * | 1970-07-31 | 1974-01-10 | Plessey Telecommunications Res | Multifrequency data receivers |
| NL7101521A (en:Method) * | 1971-02-05 | 1972-08-08 | ||
| US3934096A (en) * | 1973-04-27 | 1976-01-20 | Hitachi, Ltd. | Multi-frequency signal receiving circuit |
| US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
| JPS5543677B2 (en:Method) * | 1974-05-15 | 1980-11-07 | ||
| DE2517024C3 (de) * | 1975-04-17 | 1978-03-02 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung für einen Signalempfänger zum Sperren von Signalen, deren Pegel schwankt |
| SE396684B (sv) * | 1976-02-09 | 1977-09-26 | Ericsson Telefon Ab L M | Hallkrets i en mottagaranordning for mfc-signalering |
-
1976
- 1976-03-09 SE SE7603136A patent/SE397763B/xx not_active IP Right Cessation
- 1976-12-28 IN IN2274/CAL/76A patent/IN155829B/en unknown
-
1977
- 1977-01-03 US US05/756,115 patent/US4107475A/en not_active Expired - Lifetime
- 1977-01-04 FI FI770021A patent/FI60802C/sv not_active IP Right Cessation
- 1977-01-06 CA CA269,275A patent/CA1064633A/en not_active Expired
- 1977-01-19 AU AU21438/77A patent/AU501585B2/en not_active Expired
- 1977-01-19 DE DE2702026A patent/DE2702026C2/de not_active Expired
- 1977-01-21 NL NLAANVRAGE7700640,A patent/NL186486C/xx not_active IP Right Cessation
- 1977-02-02 SU SU772447655A patent/SU656562A3/ru active
- 1977-02-07 EG EG73/77A patent/EG13315A/xx active
- 1977-02-17 AR AR263584A patent/AR213111A1/es active
- 1977-02-17 BR BR7700987A patent/BR7700987A/pt unknown
- 1977-02-22 FR FR7705095A patent/FR2344190A1/fr active Granted
- 1977-02-23 GB GB7714/77A patent/GB1544174A/en not_active Expired
- 1977-02-28 IE IE432/77A patent/IE45187B1/en not_active IP Right Cessation
- 1977-03-08 DK DK101977AA patent/DK142719B/da not_active IP Right Cessation
- 1977-03-08 NO NO770816A patent/NO140085C/no unknown
- 1977-03-08 HU HU77EI731A patent/HU176229B/hu unknown
- 1977-03-08 IT IT21036/77A patent/IT1085209B/it active
- 1977-03-08 YU YU622/77A patent/YU41466B/xx unknown
- 1977-03-08 ES ES456619A patent/ES456619A1/es not_active Expired
-
1980
- 1980-12-30 MY MY166/80A patent/MY8000166A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| YU41466B (en) | 1987-08-31 |
| NL7700640A (nl) | 1977-09-13 |
| IE45187L (en) | 1977-09-09 |
| NO140085C (no) | 1979-07-04 |
| ES456619A1 (es) | 1978-01-16 |
| NL186486C (nl) | 1990-12-03 |
| SU656562A3 (ru) | 1979-04-05 |
| FR2344190B1 (en:Method) | 1983-10-07 |
| FI60802C (fi) | 1982-03-10 |
| FI60802B (fi) | 1981-11-30 |
| IT1085209B (it) | 1985-05-28 |
| MY8000166A (en) | 1980-12-31 |
| FR2344190A1 (fr) | 1977-10-07 |
| CA1064633A (en) | 1979-10-16 |
| SE397763B (sv) | 1977-11-14 |
| AU2143877A (en) | 1978-07-27 |
| EG13315A (en) | 1981-03-31 |
| FI770021A7 (en:Method) | 1977-09-10 |
| DE2702026A1 (de) | 1977-09-15 |
| NL186486B (nl) | 1990-07-02 |
| AU501585B2 (en) | 1979-06-21 |
| IE45187B1 (en) | 1982-07-14 |
| NO140085B (no) | 1979-03-19 |
| HU176229B (en) | 1981-01-28 |
| YU62277A (en) | 1982-05-31 |
| GB1544174A (en) | 1979-04-11 |
| SE7603136L (sv) | 1977-09-10 |
| DE2702026C2 (de) | 1985-10-24 |
| DK101977A (en:Method) | 1977-09-10 |
| DK142719C (en:Method) | 1981-08-10 |
| DK142719B (da) | 1980-12-29 |
| US4107475A (en) | 1978-08-15 |
| NO770816L (no) | 1977-09-12 |
| BR7700987A (pt) | 1977-10-18 |
| AR213111A1 (es) | 1978-12-15 |