FR688929A - Système de transmission duplex - Google Patents
Système de transmission duplexInfo
- Publication number
- FR688929A FR688929A FR688929DA FR688929A FR 688929 A FR688929 A FR 688929A FR 688929D A FR688929D A FR 688929DA FR 688929 A FR688929 A FR 688929A
- Authority
- FR
- France
- Prior art keywords
- transmission system
- duplex transmission
- duplex
- transmission
- Prior art date
- 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.)
- Expired
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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
- H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES89676D DE504122C (de) | 1929-01-28 | 1929-01-28 | UEbertragungssystem mit Gegenverkehr und Rueckkopplungssperrern |
DES93060D DE507138C (de) | 1929-01-28 | 1929-07-27 | UEbertragungssystem mit Gegenverkehr und Rueckkopplungssperrung |
Publications (1)
Publication Number | Publication Date |
---|---|
FR688929A true FR688929A (fr) | 1930-08-30 |
Family
ID=25997582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR688929D Expired FR688929A (fr) | 1929-01-28 | 1930-01-27 | Système de transmission duplex |
Country Status (6)
Country | Link |
---|---|
US (1) | US1962026A (fr) |
BE (1) | BE371008A (fr) |
DE (1) | DE507138C (fr) |
FR (1) | FR688929A (fr) |
GB (2) | GB345016A (fr) |
NL (1) | NL31723C (fr) |
-
0
- NL NL31723D patent/NL31723C/xx active
- BE BE371008D patent/BE371008A/xx unknown
-
1929
- 1929-07-27 DE DES93060D patent/DE507138C/de not_active Expired
-
1930
- 1930-01-21 US US422275A patent/US1962026A/en not_active Expired - Lifetime
- 1930-01-25 GB GB2670/30A patent/GB345016A/en not_active Expired
- 1930-01-27 GB GB2797/30A patent/GB346875A/en not_active Expired
- 1930-01-27 FR FR688929D patent/FR688929A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB346875A (en) | 1931-04-23 |
US1962026A (en) | 1934-06-05 |
DE507138C (de) | 1930-11-27 |
GB345016A (en) | 1931-03-19 |
NL31723C (fr) | |
BE371008A (fr) |
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