BE663635A - - Google Patents
Info
- Publication number
- BE663635A BE663635A BE663635DA BE663635A BE 663635 A BE663635 A BE 663635A BE 663635D A BE663635D A BE 663635DA BE 663635 A BE663635 A BE 663635A
- Authority
- BE
- Belgium
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)
- Amplifiers (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measurement Of Predetermined Time Intervals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US366463A US3319011A (en) | 1964-05-11 | 1964-05-11 | Multifrequency signal receiver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE663635A true BE663635A (nl) | 1965-09-01 |
Family
ID=23443110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE663635D BE663635A (nl) | 1964-05-11 | 1965-05-07 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3319011A (nl) |
| BE (1) | BE663635A (nl) |
| DE (1) | DE1266827B (nl) |
| GB (1) | GB1090885A (nl) |
| NL (1) | NL150653B (nl) |
| SE (1) | SE316814B (nl) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1232213B (de) * | 1964-12-15 | 1967-01-12 | Standard Elektrik Lorenz Ag | Tonfrequentes Tastwahlverfahren fuer Fernmelde-, insbesondere Fernsprechanlagen |
| GB1226368A (nl) * | 1968-08-15 | 1971-03-24 | ||
| US3539731A (en) * | 1968-11-05 | 1970-11-10 | Bell Telephone Labor Inc | Multifrequency signal receiver |
| FR2141502B1 (nl) * | 1971-06-01 | 1973-06-29 | Ibm France | |
| US4002848A (en) * | 1974-11-14 | 1977-01-11 | Reliable Electric Company | Toll fraud eliminator for telephone systems |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468305A (en) * | 1946-11-01 | 1949-04-26 | Bell Telephone Labor Inc | Signaling system |
| GB651457A (en) * | 1947-02-07 | 1951-04-04 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
| NL267564A (nl) * | 1960-08-22 | |||
| DE1157270B (de) * | 1961-10-20 | 1963-11-14 | Sueddeutsche Telefon App Kabel | Schaltungsanordnung zum Auswerten von Selektivrufsignalen in Fernmelde-, insbesondere Fernsprechanlagen |
| US3140357A (en) * | 1962-06-28 | 1964-07-07 | Bell Telephone Labor Inc | Multifrequency receiver |
-
1964
- 1964-05-11 US US366463A patent/US3319011A/en not_active Expired - Lifetime
-
1965
- 1965-04-09 DE DEW38935A patent/DE1266827B/de active Pending
- 1965-04-20 GB GB16477/65A patent/GB1090885A/en not_active Expired
- 1965-04-28 NL NL656505432A patent/NL150653B/nl not_active IP Right Cessation
- 1965-05-07 BE BE663635D patent/BE663635A/xx unknown
- 1965-05-11 SE SE6143/65A patent/SE316814B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1266827B (de) | 1968-04-25 |
| NL150653B (nl) | 1976-08-16 |
| NL6505432A (nl) | 1965-11-12 |
| SE316814B (nl) | 1969-11-03 |
| US3319011A (en) | 1967-05-09 |
| GB1090885A (en) | 1967-11-15 |