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
-
- 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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN38630D DE665323C (en) | 1935-09-19 | 1935-09-19 | Hybrid circuit provided with feedback lock |
Publications (1)
Publication Number | Publication Date |
---|---|
NL46308C true NL46308C (en) |
Family
ID=6540078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL46308D NL46308C (en) | 1935-09-19 |
Country Status (5)
Country | Link |
---|---|
US (1) | US2129990A (en) |
DE (1) | DE665323C (en) |
FR (1) | FR810646A (en) |
GB (1) | GB463178A (en) |
NL (1) | NL46308C (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE483501A (en) * | 1947-03-13 | |||
FR1005063A (en) * | 1947-05-29 | 1952-04-07 | Device to avoid the feedback effect in loudspeaker telephone systems | |
CH271525A (en) * | 1948-04-21 | 1950-10-31 | Kaelin Pierre | Station for sound transmission installation. |
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 (en) * | 1954-10-19 | 1965-03-11 | Manfred Seiffert | Facility for electrical underwater telephony |
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 |
NL125146C (en) * | 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/en not_active Expired
-
1936
- 1936-09-16 GB GB25236/36A patent/GB463178A/en not_active Expired
- 1936-09-17 FR FR810646D patent/FR810646A/en not_active Expired
- 1936-09-19 US US101669A patent/US2129990A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB463178A (en) | 1937-03-23 |
US2129990A (en) | 1938-09-13 |
FR810646A (en) | 1937-03-24 |
DE665323C (en) | 1938-09-22 |