DE2138818A1 - - Google Patents
Info
- Publication number
- DE2138818A1 DE2138818A1 DE19712138818 DE2138818A DE2138818A1 DE 2138818 A1 DE2138818 A1 DE 2138818A1 DE 19712138818 DE19712138818 DE 19712138818 DE 2138818 A DE2138818 A DE 2138818A DE 2138818 A1 DE2138818 A1 DE 2138818A1
- Authority
- DE
- Germany
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712138818 DE2138818C (de) | 1971-08-03 | Echosperre fur einen Sprechkreis auf einem Vierdraht Übertragungssystem | |
| GB182772A GB1358457A (en) | 1971-01-29 | 1972-01-14 | Echo traps for telecommunications systems |
| ES399052A ES399052A1 (es) | 1971-01-29 | 1972-01-20 | Un supresor de eco para un circuito telefonico en un siste-ma de transmision por cuatro hilos. |
| NL7201006A NL7201006A (https=) | 1971-01-29 | 1972-01-25 | |
| IL38648A IL38648A (en) | 1971-01-29 | 1972-01-26 | Echo traps for telecommunications systems |
| AU38422/72A AU466309B2 (en) | 1971-01-29 | 1972-01-27 | Improvements in or relating to echo traps for telecommunications systems |
| FR7202648A FR2124879A5 (https=) | 1971-01-29 | 1972-01-27 | |
| SE7200984A SE380956B (sv) | 1971-01-29 | 1972-01-28 | Ekosperr, inkopplad i en talkrets i ett fyrtradigt overforingssystem |
| IT19936/72A IT947086B (it) | 1971-01-29 | 1972-01-28 | Soppressore d eco per un circuito telefonico su un sistema di tra smissione a quattro fili |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712138818 DE2138818C (de) | 1971-08-03 | Echosperre fur einen Sprechkreis auf einem Vierdraht Übertragungssystem |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2138818A1 true DE2138818A1 (https=) | 1973-01-25 |
| DE2138818B1 DE2138818B1 (de) | 1973-01-25 |
| DE2138818C DE2138818C (de) | 1973-08-16 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| DE2138818B1 (de) | 1973-01-25 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| E77 | Valid patent as to the heymanns-index 1977 | ||
| EHJ | Ceased/non-payment of the annual fee |