BE505114A - - Google Patents
Info
- Publication number
- BE505114A BE505114A BE505114DA BE505114A BE 505114 A BE505114 A BE 505114A BE 505114D A BE505114D A BE 505114DA BE 505114 A BE505114 A BE 505114A
- Authority
- BE
- Belgium
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
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- 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
- H04B3/21—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a set of bandfilters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/08—Arrangements for combining channels
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1023285T | 1950-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE505114A true BE505114A (en) |
Family
ID=9578195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE505114D BE505114A (en) | 1950-08-12 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE505114A (en) |
| FR (1) | FR1023285A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235765A1 (en) * | 1986-03-03 | 1987-09-09 | Head Stereo GmbH, Kopfbezogene Aufnahme- und Wiedergabetechnik & Co. Messtechnik KG | Device for improving the side-tone attenuation or the loop amplification in duplex telephone intercommunication devices |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2156185A (en) * | 1984-03-21 | 1985-10-02 | Philips Electronic Associated | Loudspeaking telephone instrument |
| GB2156184A (en) * | 1984-03-21 | 1985-10-02 | Philips Electronic Associated | Loudspeaking telephone instrument |
-
0
- BE BE505114D patent/BE505114A/xx unknown
-
1950
- 1950-08-12 FR FR1023285D patent/FR1023285A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235765A1 (en) * | 1986-03-03 | 1987-09-09 | Head Stereo GmbH, Kopfbezogene Aufnahme- und Wiedergabetechnik & Co. Messtechnik KG | Device for improving the side-tone attenuation or the loop amplification in duplex telephone intercommunication devices |
| WO1987005456A1 (en) * | 1986-03-03 | 1987-09-11 | Head Stereo Gmbh Kopfbezogene Aufnahme- Und Wieder | Device for improving the side-tone attenuation or loop amplification in interphone systems |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1023285A (en) | 1953-03-16 |