NL46308C - - Google Patents
Info
- Publication number
- NL46308C NL46308C NL46308DA NL46308C NL 46308 C NL46308 C NL 46308C NL 46308D A NL46308D A NL 46308DA NL 46308 C NL46308 C NL 46308C
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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
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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
- 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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN38630D DE665323C (de) | 1935-09-19 | 1935-09-19 | Mit Rueckkopplungssperre versehene Gabelschaltung |
Publications (1)
Publication Number | Publication Date |
---|---|
NL46308C true NL46308C (ja) |
Family
ID=6540078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL46308D NL46308C (ja) | 1935-09-19 |
Country Status (5)
Country | Link |
---|---|
US (1) | US2129990A (ja) |
DE (1) | DE665323C (ja) |
FR (1) | FR810646A (ja) |
GB (1) | GB463178A (ja) |
NL (1) | NL46308C (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE483501A (ja) * | 1947-03-13 | |||
FR1005063A (fr) * | 1947-05-29 | 1952-04-07 | Dispositif pour éviter l'effet larsen dans les installations téléphoniques à hautparleur | |
CH271525A (fr) * | 1948-04-21 | 1950-10-31 | Kaelin Pierre | Poste pour installation de transmission du son. |
US2623949A (en) * | 1949-06-08 | 1952-12-30 | Le Teleampliphone Soc | Two-way loud-speaker telephone installation |
US2694749A (en) * | 1950-04-18 | 1954-11-16 | Sepco 45 B D Sebastopol | Communication system |
US2629024A (en) * | 1950-12-29 | 1953-02-17 | Bell Telephone Labor Inc | Unbalanced-to-ground two-to-fourwire connection |
DE976957C (de) * | 1954-10-19 | 1965-03-11 | Manfred Seiffert | Einrichtung fuer elektrische Unterwassertelefonie |
US3041411A (en) * | 1958-06-10 | 1962-06-26 | Donald C Beatty | Automatic, circuit-condition-change-responsive, on-off control for loudspeaking telephone and the like |
US3065300A (en) * | 1958-09-30 | 1962-11-20 | Modern Telephones Great Britai | Loudspeaking telephone systems |
NL245570A (ja) * | 1958-12-29 | |||
US3189690A (en) * | 1960-04-27 | 1965-06-15 | Modern Telephones Great Britai | Two-way telephone systems with talk-listen switching |
US3075045A (en) * | 1960-08-29 | 1963-01-22 | Bell Telephone Labor Inc | Speakerphone |
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0
- NL NL46308D patent/NL46308C/xx active
-
1935
- 1935-09-19 DE DEN38630D patent/DE665323C/de not_active Expired
-
1936
- 1936-09-16 GB GB25236/36A patent/GB463178A/en not_active Expired
- 1936-09-17 FR FR810646D patent/FR810646A/fr not_active Expired
- 1936-09-19 US US101669A patent/US2129990A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR810646A (fr) | 1937-03-24 |
DE665323C (de) | 1938-09-22 |
US2129990A (en) | 1938-09-13 |
GB463178A (en) | 1937-03-23 |