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 (US06653308-20031125-C00197.png) | 1985-03-16 |
Family
ID=20327272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IN2274/CAL/76A IN155829B (US06653308-20031125-C00197.png) | 1976-03-09 | 1976-12-28 |
Country Status (22)
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 (US06653308-20031125-C00197.png) * | 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 (US06653308-20031125-C00197.png) * | 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 DE DE2702026A patent/DE2702026C2/de not_active Expired
- 1977-01-19 AU AU21438/77A patent/AU501585B2/en 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 ES ES456619A patent/ES456619A1/es not_active Expired
- 1977-03-08 NO NO770816A patent/NO140085C/no unknown
- 1977-03-08 DK DK101977AA patent/DK142719B/da not_active IP Right Cessation
- 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
-
1980
- 1980-12-30 MY MY166/80A patent/MY8000166A/xx unknown
