BE475750A - - Google Patents
Info
- Publication number
- BE475750A BE475750A BE475750DA BE475750A BE 475750 A BE475750 A BE 475750A BE 475750D A BE475750D A BE 475750DA BE 475750 A BE475750 A BE 475750A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US297832A US2224569A (en) | 1939-10-04 | 1939-10-04 | Control of transmission in two-way signaling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE475750A true BE475750A (pt) |
Family
ID=23147926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE475750D BE475750A (pt) | 1939-10-04 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2224569A (pt) |
| BE (1) | BE475750A (pt) |
| FR (1) | FR949301A (pt) |
| GB (1) | GB628348A (pt) |
| NL (1) | NL70924C (pt) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH303090A (de) * | 1949-10-11 | 1954-11-15 | Nederlanden Staat | Gabelschaltung. |
| US2632052A (en) * | 1950-11-02 | 1953-03-17 | Bell Telephone Labor Inc | Transmission control in two-way signaling system |
| NL290910A (pt) * | 1962-03-30 | |||
| US5471527A (en) * | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
| CN118555373B (zh) * | 2024-07-29 | 2024-10-18 | 广东柔乐电器有限公司 | 二线低功耗可视对讲门禁系统 |
-
0
- BE BE475750D patent/BE475750A/xx unknown
- NL NL70924D patent/NL70924C/xx active
-
1939
- 1939-10-04 US US297832A patent/US2224569A/en not_active Expired - Lifetime
-
1947
- 1947-07-10 FR FR949301D patent/FR949301A/fr not_active Expired
- 1947-07-18 GB GB19261/47A patent/GB628348A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2224569A (en) | 1940-12-10 |
| NL70924C (pt) | |
| GB628348A (en) | 1949-08-26 |
| FR949301A (fr) | 1949-08-26 |