BE720880A - - Google Patents
Info
- Publication number
- BE720880A BE720880A BE720880DA BE720880A BE 720880 A BE720880 A BE 720880A BE 720880D A BE720880D A BE 720880DA BE 720880 A BE720880 A BE 720880A
- 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)
- Circuits Of Receivers In General (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6712685A NL6712685A (https=) | 1967-09-15 | 1967-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE720880A true BE720880A (https=) | 1969-03-13 |
Family
ID=19801225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE720880D BE720880A (https=) | 1967-09-15 | 1968-09-13 |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT289213B (https=) |
| BE (1) | BE720880A (https=) |
| DK (1) | DK141430B (https=) |
| FR (1) | FR1579910A (https=) |
| GB (1) | GB1190286A (https=) |
| NL (1) | NL6712685A (https=) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR7101977D0 (pt) * | 1971-04-05 | 1973-06-14 | Ibm | Processos e disposicoes de circuito para decodificacao digital de sinais de frequencia codificada |
-
1967
- 1967-09-15 NL NL6712685A patent/NL6712685A/xx unknown
-
1968
- 1968-09-12 GB GB4340668A patent/GB1190286A/en not_active Expired
- 1968-09-12 DK DK439568A patent/DK141430B/da unknown
- 1968-09-12 AT AT888768A patent/AT289213B/de not_active IP Right Cessation
- 1968-09-13 BE BE720880D patent/BE720880A/xx unknown
- 1968-09-13 FR FR1579910D patent/FR1579910A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DK141430B (da) | 1980-03-10 |
| AT289213B (de) | 1971-04-13 |
| DK141430C (https=) | 1980-09-15 |
| FR1579910A (https=) | 1969-08-29 |
| GB1190286A (en) | 1970-04-29 |
| NL6712685A (https=) | 1969-03-18 |