NO743189L - - Google Patents
Info
- Publication number
- NO743189L NO743189L NO743189A NO743189A NO743189L NO 743189 L NO743189 L NO 743189L NO 743189 A NO743189 A NO 743189A NO 743189 A NO743189 A NO 743189A NO 743189 L NO743189 L NO 743189L
- Authority
- NO
- Norway
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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Networks Using Active Elements (AREA)
- Stereo-Broadcasting Methods (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7312548A NL7312548A (nl) | 1973-09-12 | 1973-09-12 | Multifrequent signaleringsstelsel. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO743189L true NO743189L (fr) | 1975-04-07 |
| NO140727B NO140727B (no) | 1979-07-16 |
| NO140727C NO140727C (no) | 1979-10-24 |
Family
ID=19819583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO743189A NO140727C (no) | 1973-09-12 | 1974-09-05 | Multifrekvent signaleringssystem |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3961143A (fr) |
| BE (1) | BE819816A (fr) |
| BR (1) | BR7407544A (fr) |
| DE (1) | DE2442674A1 (fr) |
| ES (1) | ES429974A1 (fr) |
| FR (1) | FR2243572B1 (fr) |
| GB (1) | GB1474403A (fr) |
| IE (1) | IE40288B1 (fr) |
| IT (1) | IT1021273B (fr) |
| NL (1) | NL7312548A (fr) |
| NO (1) | NO140727C (fr) |
| ZA (1) | ZA744657B (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5391612A (en) * | 1977-01-24 | 1978-08-11 | Nec Corp | Receiver for multiple frequency signal |
| US4091243A (en) * | 1977-07-26 | 1978-05-23 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver |
| NL7903346A (nl) * | 1979-04-27 | 1980-10-29 | Bell Telephone Mfg | Digitaal signaleringsstelsel. |
| US5170487A (en) * | 1989-01-19 | 1992-12-08 | Seiko Corp. | Paging system with multiple frequencies and multiple protocols |
| US7835701B2 (en) * | 2004-03-29 | 2010-11-16 | Edgewater Computer Systems, Inc. | Detecting and eliminating spurious energy in communications systems via multi-channel processing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3072747A (en) * | 1958-05-27 | 1963-01-08 | Ass Elect Ind Woolwich Ltd | Pulse signalling systems |
| NL267564A (fr) * | 1960-08-22 | |||
| US3539731A (en) * | 1968-11-05 | 1970-11-10 | Bell Telephone Labor Inc | Multifrequency signal receiver |
-
1973
- 1973-09-12 NL NL7312548A patent/NL7312548A/xx not_active Application Discontinuation
-
1974
- 1974-07-11 GB GB3069774A patent/GB1474403A/en not_active Expired
- 1974-07-22 ZA ZA00744657A patent/ZA744657B/xx unknown
- 1974-07-23 IE IE1569/74A patent/IE40288B1/en unknown
- 1974-09-05 NO NO743189A patent/NO140727C/no unknown
- 1974-09-06 DE DE2442674A patent/DE2442674A1/de not_active Withdrawn
- 1974-09-11 FR FR7430733A patent/FR2243572B1/fr not_active Expired
- 1974-09-11 IT IT27163/74A patent/IT1021273B/it active
- 1974-09-11 BR BR7544/74A patent/BR7407544A/pt unknown
- 1974-09-11 US US05/505,014 patent/US3961143A/en not_active Expired - Lifetime
- 1974-09-11 ES ES429974A patent/ES429974A1/es not_active Expired
- 1974-09-12 BE BE2053860A patent/BE819816A/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB1474403A (en) | 1977-05-25 |
| IE40288B1 (en) | 1979-04-25 |
| BR7407544A (pt) | 1976-05-04 |
| ZA744657B (en) | 1975-08-27 |
| FR2243572B1 (fr) | 1978-02-17 |
| NO140727C (no) | 1979-10-24 |
| DE2442674A1 (de) | 1975-03-13 |
| FR2243572A1 (fr) | 1975-04-04 |
| IE40288L (en) | 1975-03-12 |
| US3961143A (en) | 1976-06-01 |
| AU7177174A (en) | 1976-01-29 |
| BE819816A (nl) | 1975-03-12 |
| ES429974A1 (es) | 1976-10-01 |
| NL7312548A (nl) | 1975-03-14 |
| NO140727B (no) | 1979-07-16 |
| IT1021273B (it) | 1978-01-30 |