BE721497A - - Google Patents
Info
- Publication number
- BE721497A BE721497A BE721497DA BE721497A BE 721497 A BE721497 A BE 721497A BE 721497D A BE721497D A BE 721497DA BE 721497 A BE721497 A BE 721497A
- 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)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1967S0112090 DE1537837B1 (de) | 1967-09-28 | 1967-09-28 | Schaltungsanordnung fuer frequenzselektive Waehlkennzeichenempfaenger in Fernmelde-,insbesondere Fernsprechanlagen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE721497A true BE721497A (bg) | 1969-03-27 |
Family
ID=7531475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE721497D BE721497A (bg) | 1967-09-28 | 1968-09-27 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE721497A (bg) |
| CH (1) | CH481544A (bg) |
| DE (1) | DE1537837B1 (bg) |
| FR (1) | FR1595628A (bg) |
| GB (1) | GB1203887A (bg) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1192276B (de) * | 1963-11-05 | 1965-05-06 | Standard Elektrik Lorenz Ag | Signalverfahren fuer Tastwahl mit Tonfrequenz |
| BE634529A (bg) * | 1963-07-05 | |||
| DE1183970B (de) * | 1963-07-19 | 1964-12-23 | Siemens Ag | Anordnung zur UEbertragung tonfrequenter Signale ueber einen Nachrichtenkanal mit Mitteln gegen fehlerhafte Auswertung bei Stoersignal- und Sprachbeeinflussung |
| DE1201417B (de) * | 1964-07-10 | 1965-09-23 | Standard Elektrik Lorenz Ag | Tonfrequentes Tastwahlverfahren ohne Gleichstrom-Wahlbegleitzeichen in Fernmelde-, insbesondere Fernsprechanlagen und Schaltungsanordnung zur Durchfuehrung des Verfahrens |
-
1967
- 1967-09-28 DE DE1967S0112090 patent/DE1537837B1/de active Pending
-
1968
- 1968-09-26 CH CH1441168A patent/CH481544A/de not_active IP Right Cessation
- 1968-09-27 BE BE721497D patent/BE721497A/xx unknown
- 1968-09-27 FR FR1595628D patent/FR1595628A/fr not_active Expired
- 1968-09-27 GB GB4588568A patent/GB1203887A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1595628A (bg) | 1970-06-15 |
| DE1537837B1 (de) | 1970-11-12 |
| GB1203887A (en) | 1970-09-03 |
| CH481544A (de) | 1969-11-15 |