GB430567A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB430567A GB430567A GB13690/35A GB1369035A GB430567A GB 430567 A GB430567 A GB 430567A GB 13690/35 A GB13690/35 A GB 13690/35A GB 1369035 A GB1369035 A GB 1369035A GB 430567 A GB430567 A GB 430567A
- Authority
- GB
- United Kingdom
- Prior art keywords
- networks
- attenuation
- relating
- control voltage
- telephone systems
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
430,567. Two-way transmission. RYALL, L. E., 52, Crescent Gardens, Eastcote, Ruislip, Middlesex. Nov. 14, 1933, No. 13690/35. Divided out of 430,158. Drawings to Specification. [Class 40 (iv)] In a system in which a single control voltage controls the attenuation of two or more networks of a kind such as that described in Specification 413,383 in which an abrupt change in impedance takes place at a critical voltage, the networks are differently biassed initially and the control voltage is arranged to build up gradually so that the changes of attenuation of the various networks take place in succession. The detailed description is identical with that in Specification 430,158.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB202982X | 1933-11-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB430567A true GB430567A (en) | 1935-06-14 |
Family
ID=10143647
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13690/35A Expired GB430567A (en) | 1933-11-14 | 1933-11-14 | Improvements in or relating to telephone systems |
GB31753/33A Expired GB430158A (en) | 1933-11-14 | 1933-11-14 | Improvements in or relating to telephone systems |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31753/33A Expired GB430158A (en) | 1933-11-14 | 1933-11-14 | Improvements in or relating to telephone systems |
Country Status (7)
Country | Link |
---|---|
US (1) | US2082357A (en) |
BE (1) | BE406242A (en) |
CH (1) | CH202982A (en) |
DE (1) | DE677043C (en) |
FR (1) | FR781186A (en) |
GB (2) | GB430567A (en) |
NL (1) | NL40266C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE744088C (en) * | 1938-05-10 | 1944-01-08 | Siemens Ag | Loudspeaker system with feedback lock |
DE882420C (en) * | 1938-04-12 | 1953-07-09 | Siemens Ag | Circuit arrangement for feedback locks in loudspeaker systems |
DE890062C (en) * | 1936-10-14 | 1953-09-17 | Siemens Ag | Circuit arrangement for preventing electroacoustic feedback, especially in loudspeaker systems |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE759529C (en) * | 1940-04-26 | 1954-05-03 | Hell Rudolf Dr Ing | Feedback lock |
DE896058C (en) * | 1941-02-21 | 1953-11-09 | Electrical Fono Films Co As | Dynamic control circuit with adjustable degree of control |
GB561405A (en) * | 1942-11-14 | 1944-05-18 | Automatic Telephone & Elect | Improvements in or relating to telecommunication systems |
US2696529A (en) * | 1950-09-02 | 1954-12-07 | Bell Telephone Labor Inc | Voice-operated switching system |
-
0
- BE BE406242D patent/BE406242A/xx unknown
- NL NL40266D patent/NL40266C/xx active
-
1933
- 1933-11-14 GB GB13690/35A patent/GB430567A/en not_active Expired
- 1933-11-14 GB GB31753/33A patent/GB430158A/en not_active Expired
-
1934
- 1934-11-09 DE DER91872D patent/DE677043C/en not_active Expired
- 1934-11-09 US US752296A patent/US2082357A/en not_active Expired - Lifetime
- 1934-11-13 FR FR781186D patent/FR781186A/en not_active Expired
- 1934-11-14 CH CH202982D patent/CH202982A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE890062C (en) * | 1936-10-14 | 1953-09-17 | Siemens Ag | Circuit arrangement for preventing electroacoustic feedback, especially in loudspeaker systems |
DE882420C (en) * | 1938-04-12 | 1953-07-09 | Siemens Ag | Circuit arrangement for feedback locks in loudspeaker systems |
DE744088C (en) * | 1938-05-10 | 1944-01-08 | Siemens Ag | Loudspeaker system with feedback lock |
Also Published As
Publication number | Publication date |
---|---|
BE406242A (en) | |
DE677043C (en) | 1939-06-17 |
GB430158A (en) | 1935-06-14 |
FR781186A (en) | 1935-05-10 |
CH202982A (en) | 1939-02-15 |
NL40266C (en) | |
US2082357A (en) | 1937-06-01 |
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