BE464853A - - Google Patents
Info
- Publication number
- BE464853A BE464853A BE464853DA BE464853A BE 464853 A BE464853 A BE 464853A BE 464853D A BE464853D A BE 464853DA BE 464853 A BE464853 A BE 464853A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US290090A US2282405A (en) | 1939-08-14 | 1939-08-14 | Transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
BE464853A true BE464853A (sh) |
Family
ID=23114493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE464853D BE464853A (sh) | 1939-08-14 |
Country Status (4)
Country | Link |
---|---|
US (3) | US2282405A (sh) |
BE (1) | BE464853A (sh) |
FR (1) | FR930594A (sh) |
GB (1) | GB542252A (sh) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2428520A (en) * | 1943-05-01 | 1947-10-07 | Automatic Elect Lab | Transmission system |
CH251257A (de) * | 1943-11-03 | 1947-10-15 | Autophon Ag | Hörerschaltung in Teilnehmereinrichtung einer Wechselsprechanlage. |
US2477275A (en) * | 1944-01-15 | 1949-07-26 | Firm Autophon Ag | Voice-controlled two-way communication system |
US2487455A (en) * | 1945-01-29 | 1949-11-08 | Stromberg Carlson Co | Telephone circuit |
US2468553A (en) * | 1945-03-17 | 1949-04-26 | Automatic Elect Lab | Voice operated control circuit |
US2542921A (en) * | 1945-07-02 | 1951-02-20 | Automatic Elect Lab | Signal operated control for twochannel transmission systems |
US2515726A (en) * | 1945-09-24 | 1950-07-18 | Automatic Elect Lab | Intercommunicating system |
US2472211A (en) * | 1945-12-13 | 1949-06-07 | Automatic Elect Lab | Antisinging gain controlled repeater |
US2484691A (en) * | 1946-02-14 | 1949-10-11 | Western Electric Co | Loud-speaking communication system |
BE476344A (sh) * | 1946-06-20 | |||
US2497779A (en) * | 1946-10-09 | 1950-02-14 | Northern Electric Co | Four-wire transmission circuit thermistor control |
US2568397A (en) * | 1947-02-20 | 1951-09-18 | Rca Corp | Telephone terminal equipment |
NL69785C (sh) * | 1947-02-21 | |||
US2647172A (en) * | 1948-06-11 | 1953-07-28 | Le Teleampliphone Soc | Electronic switch |
GB703801A (en) * | 1951-11-19 | 1954-02-10 | Leonard Ernest Ryall | Improvements in or relating to voice switching in telephone transmission systems |
US3136864A (en) * | 1959-10-05 | 1964-06-09 | Automatic Elect Lab | Loudspeaking telephone with electronic voice switching |
-
0
- US US22897D patent/USRE22897E/en not_active Expired
- BE BE464853D patent/BE464853A/xx unknown
- US US2371291D patent/US2371291A/en not_active Expired - Lifetime
-
1939
- 1939-08-14 US US290090A patent/US2282405A/en not_active Expired - Lifetime
-
1940
- 1940-07-31 GB GB12374/40A patent/GB542252A/en not_active Expired
-
1946
- 1946-07-12 FR FR930594D patent/FR930594A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
USRE22897E (en) | 1947-07-15 |
FR930594A (fr) | 1948-01-29 |
GB542252A (en) | 1942-01-01 |
US2282405A (en) | 1942-05-12 |
US2371291A (en) | 1945-03-13 |