BE483454A - - Google Patents
Info
- Publication number
- BE483454A BE483454A BE483454DA BE483454A BE 483454 A BE483454 A BE 483454A BE 483454D A BE483454D A BE 483454DA BE 483454 A BE483454 A BE 483454A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
-
- 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
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL282890X | 1946-10-02 | ||
| US754759A US2567148A (en) | 1946-06-15 | 1947-06-14 | Telephone signaling device |
| US2447A US2620398A (en) | 1946-10-02 | 1948-01-15 | Voice frequency signaling system for telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE483454A true BE483454A (en:Method) |
Family
ID=32303329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE483454D BE483454A (en:Method) | 1946-10-02 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2620398A (en:Method) |
| BE (1) | BE483454A (en:Method) |
| CH (1) | CH282890A (en:Method) |
| FR (1) | FR958116A (en:Method) |
| GB (1) | GB648849A (en:Method) |
| NL (1) | NL68564C (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438618A (en) * | 1993-11-15 | 1995-08-01 | Mytech Systems Corporation | Vocal frequency suppression apparatus and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1711651A (en) * | 1927-01-29 | 1929-05-07 | Bell Telephone Labor Inc | Signaling system |
| US1709554A (en) * | 1927-07-20 | 1929-04-16 | Bell Telephone Labor Inc | Voice-frequency calling system |
| US2117721A (en) * | 1935-09-06 | 1938-05-17 | Siemens Ag | Telephone system |
| US2138613A (en) * | 1937-05-14 | 1938-11-29 | Bell Telephone Labor Inc | Signaling system |
| US2299821A (en) * | 1940-04-05 | 1942-10-27 | Bell Telephone Labor Inc | Signaling system |
| US2410149A (en) * | 1944-02-17 | 1946-10-29 | Jr Robert A Clark | Signaling system |
-
0
- FR FR958116D patent/FR958116A/fr not_active Expired
- BE BE483454D patent/BE483454A/xx unknown
- NL NL68564D patent/NL68564C/xx active
-
1947
- 1947-12-19 CH CH282890D patent/CH282890A/fr unknown
- 1947-12-31 GB GB34977/47A patent/GB648849A/en not_active Expired
-
1948
- 1948-01-15 US US2447A patent/US2620398A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CH282890A (fr) | 1952-05-15 |
| NL68564C (en:Method) | |
| US2620398A (en) | 1952-12-02 |
| GB648849A (en) | 1951-01-10 |
| FR958116A (en:Method) | 1950-03-03 |