GB465464A - Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systems - Google Patents
Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systemsInfo
- Publication number
- GB465464A GB465464A GB3025335A GB3025335A GB465464A GB 465464 A GB465464 A GB 465464A GB 3025335 A GB3025335 A GB 3025335A GB 3025335 A GB3025335 A GB 3025335A GB 465464 A GB465464 A GB 465464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- networks
- signals
- control
- voltages
- circuit
- 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)
- Cosmetics (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
465,464. Two - - way transmission. TELEPHONE MANUFACTURING CO., Ltd., BURRIDGE, B. J., and PADDLE, L. H. Nov. 1, 1935, No. 30253. Addition to 442,947. [Class 40 (iv)] [Also in Group XL] The system described in the parent Specification which involves the application of control voltages derived by rectifying A.C. signals from two sources to different points of a multi-branch circuit for the control of attenuation networks deriving their normal bias voltages from such circuit is modified by amplifying the signals before rectifying and applying the control voltages in direct opposition to each other and simplifying or omitting the multi-branch circuit. As shown in Fig. 1 control signals on circuits S1, S2 are amplified and rectified and produce voltages across resistances R3, R4 acting in opposition on the networks N1, N2. Signals from S2 also operate a relay X which short-circuits itself. Normal bias for the rectifiers is supplied by battery BT. In one modification only one, and in another neither of the networks has an initial bias. In another arrangement, Fig. 4, the control signals act on four networks N1 .. N4 which may have different initial bias so that they change their state in a predetermined order. A further arrangement, Fig. 5 (not shown), resembles that shown in Fig. 4 but the transformers T3, T4 have separate secondaries for N1, N2 and N3, N4. In a further modification, Fig. 6, adapted for very weak signals, the valves V<1>, V<2> amplify alternating current from a local source such as AC1 and the incoming signals either block or unblock these valves, the output from which is rectified and controls the networks as in the other systems. The circuit VC automatically limits the value of the resulting currents.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3098235A GB443011A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to telephone or like alternating current systems employing variable attenuation networks |
GB2388934A GB442947A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to the control of variable attenuation networks for alternating current signalling or like systems |
GB3025335A GB465464A (en) | 1935-11-01 | 1935-11-01 | Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3025335A GB465464A (en) | 1935-11-01 | 1935-11-01 | Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB465464A true GB465464A (en) | 1937-05-03 |
Family
ID=10304704
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3098235A Expired GB443011A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to telephone or like alternating current systems employing variable attenuation networks |
GB2388934A Expired GB442947A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to the control of variable attenuation networks for alternating current signalling or like systems |
GB3025335A Expired GB465464A (en) | 1935-11-01 | 1935-11-01 | Improvements in or relating to the control of variable attenuation of networks for alternating signalling or like systems |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3098235A Expired GB443011A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to telephone or like alternating current systems employing variable attenuation networks |
GB2388934A Expired GB442947A (en) | 1935-11-01 | 1934-08-18 | Improvements in or relating to the control of variable attenuation networks for alternating current signalling or like systems |
Country Status (1)
Country | Link |
---|---|
GB (3) | GB443011A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2164344A (en) * | 1938-04-28 | 1939-07-04 | Bell Telephone Labor Inc | Signal transmission system |
DE896058C (en) * | 1941-02-21 | 1953-11-09 | Electrical Fono Films Co As | Dynamic control circuit with adjustable degree of control |
-
1934
- 1934-08-18 GB GB3098235A patent/GB443011A/en not_active Expired
- 1934-08-18 GB GB2388934A patent/GB442947A/en not_active Expired
-
1935
- 1935-11-01 GB GB3025335A patent/GB465464A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB442947A (en) | 1936-02-18 |
GB443011A (en) | 1936-02-18 |
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