BE622438A - - Google Patents
Info
- Publication number
- BE622438A BE622438A BE622438DA BE622438A BE 622438 A BE622438 A BE 622438A BE 622438D A BE622438D A BE 622438DA BE 622438 A BE622438 A BE 622438A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL269292 | 1961-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE622438A true BE622438A (Direct) |
Family
ID=19753285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE622438D BE622438A (Direct) | 1961-09-15 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE622438A (Direct) |
| CH (1) | CH395205A (Direct) |
| DE (1) | DE1159041B (Direct) |
| GB (1) | GB984580A (Direct) |
| NL (1) | NL269292A (Direct) |
-
0
- NL NL269292D patent/NL269292A/xx unknown
- BE BE622438D patent/BE622438A/xx unknown
-
1962
- 1962-09-11 DE DEN22079A patent/DE1159041B/de active Pending
- 1962-09-12 GB GB3483762A patent/GB984580A/en not_active Expired
- 1962-09-12 CH CH1081162A patent/CH395205A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH395205A (de) | 1965-07-15 |
| DE1159041B (de) | 1963-12-12 |
| GB984580A (en) | 1965-02-24 |
| NL269292A (Direct) |