GB318989A - Improvements in receivers for telegraphic and like signals - Google Patents
Improvements in receivers for telegraphic and like signalsInfo
- Publication number
- GB318989A GB318989A GB1951829A GB1951829A GB318989A GB 318989 A GB318989 A GB 318989A GB 1951829 A GB1951829 A GB 1951829A GB 1951829 A GB1951829 A GB 1951829A GB 318989 A GB318989 A GB 318989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impulses
- relay
- network
- signals
- valves
- 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
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
- H03B19/03—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source using non-linear inductance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
- H04L25/03127—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals using only passive components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
- H04L25/062—Setting decision thresholds using feedforward techniques only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/24—Relay circuits using discharge tubes or semiconductor devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
- Emergency Protection Circuit Devices (AREA)
- Ac-Ac Conversion (AREA)
- Electrotherapy Devices (AREA)
- Superheterodyne Receivers (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Current Or Voltage (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
318,989. Electrical Research Products, Inc., (Assignees of Curtis, A. M., and Burton, E. T.). Sept. 15, 1928, [Convention date]. Addition to 312,338. Eliminating effects of disturbing currents.- Wandering zero is corrected by means of saturation effects in a transformer having a core of high permeability, features disclosed in Specifications 270,354 and 315,821 being adopted. The primary coils 14, 15, Fig. 1, have their cores polarized in opposite directions by the coils 19, 20, which are energized by a battery 21 through a resistance r and choke c. Owing to saturation effects in the cores, the transformers 14, 17 and 15, 18 are effective over only a narrow range of current strength in positive and negative signals respectively. When the signals A, Fig. 7, passing from the input pair 12, 13, Fig. 1, to the receiving circuit 16, exhibit zero wander so that their peak voltage cross the narrow voltage bands x or y for which the coils 17, 18 are respectively effective, voltage-impulses B, C are applied to the grids of the valves 22, 23. The resistances 24, 25 and condensers 26, 27 are so arranged that unidirectional impulses D, E of plate current pass through the primaries of the transformers 29 so as momentarily to energize the polarized relay 30. Voltage impulses smoothed to the form I are consequently admitted from the batteries 30a through the impedance network 33 to the grid of the valve 38, so as to correct the zero wander. In a modification (Fig. 2, not shown) the grids of the valves 22, 23 are positively biassed, with the result that the plate-current impulses are of unequal magnitude as at F, G, and only one in each pair is able to actuate the relay 30 so as to send on impulses H. In another modification (Fig. 3, not shown) a negative grid-bias is applied to the valves 22, 28 and the resistances and condensers 24 - - 27 are omitted. Single impulses of plate current (corresponding to the rising portions of the excess signals) are produced in this case as at J, K; impulses L are input to the network 33, and a grid-voltage correction M is applied to the valve 38. Figs. 4, 5 show two alternative networks which may be used instead of the network 33; and according to Fig. 4 (part not shown) a transformer-coupled amplifier is inserted between the transformer 29 and relay 30. The relay 30 shown in Figs. 4, 5 is provided with an additional winding 55b which prolongs the effects of the impulses applied to the winding 55<a>; the charging current to the condenser 31, Fig. 4, or 6 Fig. 5, prolongs the impulses N (winding 55a) to the form 0 (winding 55b). In Fig. 5 the locking network 61, 62 can be adjusted independently of the shaping network 33. In a simplified arrangement (Fig. 6, not shown) the push-pull pair of valves 22, 23 is replaced by a single valve and the signals as well as correcting impulses are applied to the correcting relay 30, a corrected - signal curve of the type shown at P being obtained. Specifications 270,354 and 315,821 are referred to.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US280709A US1936153A (en) | 1928-05-26 | 1928-05-26 | Electric wave transmission system |
US282381A US1763880A (en) | 1928-06-02 | 1928-06-02 | Signaling system |
US293816A US1858037A (en) | 1928-07-19 | 1928-07-19 | Zero correcting circuit |
US306123A US1818463A (en) | 1928-09-15 | 1928-09-15 | Zero correcting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB318989A true GB318989A (en) | 1930-09-25 |
Family
ID=27501288
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB742629A Expired GB312338A (en) | 1928-05-26 | 1929-03-07 | Improvements in or relating to electrical energy translating systems |
GB769429A Expired GB312904A (en) | 1928-05-26 | 1929-03-08 | Improvements in electrical telegraph and like signalling systems |
GB1552029A Expired GB315821A (en) | 1928-05-26 | 1929-05-17 | Improvements in amplifiers for telegraphic and like signals |
GB1951829A Expired GB318989A (en) | 1928-05-26 | 1929-06-25 | Improvements in receivers for telegraphic and like signals |
GB28990/29A Expired GB340286A (en) | 1928-05-26 | 1929-09-24 | Improvements in electrical frequency changing apparatus |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB742629A Expired GB312338A (en) | 1928-05-26 | 1929-03-07 | Improvements in or relating to electrical energy translating systems |
GB769429A Expired GB312904A (en) | 1928-05-26 | 1929-03-08 | Improvements in electrical telegraph and like signalling systems |
GB1552029A Expired GB315821A (en) | 1928-05-26 | 1929-05-17 | Improvements in amplifiers for telegraphic and like signals |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28990/29A Expired GB340286A (en) | 1928-05-26 | 1929-09-24 | Improvements in electrical frequency changing apparatus |
Country Status (3)
Country | Link |
---|---|
DE (4) | DE539187C (en) |
FR (4) | FR673502A (en) |
GB (5) | GB312338A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE767199C (en) * | 1935-03-27 | 1952-03-31 | Telefunken Gmbh | Circuit for generating short pulses |
DE755390C (en) * | 1938-02-17 | 1953-08-10 | Lorenz C Ag | Arrangement for the control of tilting devices by means of synchronizing impulses which pass through a separating device and have lost their edge steepness as a result |
DE970583C (en) * | 1951-08-10 | 1958-10-09 | Oskar Vierling Dr | Circuit arrangement for the optional switching of alternating current circuits in telecommunications systems |
-
1929
- 1929-03-07 GB GB742629A patent/GB312338A/en not_active Expired
- 1929-03-08 GB GB769429A patent/GB312904A/en not_active Expired
- 1929-03-23 DE DEE39029D patent/DE539187C/en not_active Expired
- 1929-03-26 DE DEE39031D patent/DE540413C/en not_active Expired
- 1929-04-18 FR FR673502D patent/FR673502A/en not_active Expired
- 1929-04-25 FR FR36770D patent/FR36770E/en not_active Expired
- 1929-05-17 GB GB1552029A patent/GB315821A/en not_active Expired
- 1929-05-18 DE DE1929E0039267 patent/DE540412C/en not_active Expired
- 1929-05-31 FR FR37104D patent/FR37104E/en not_active Expired
- 1929-06-25 GB GB1951829A patent/GB318989A/en not_active Expired
- 1929-07-14 DE DE1929E0039570 patent/DE553928C/en not_active Expired
- 1929-07-31 FR FR37685D patent/FR37685E/en not_active Expired
- 1929-09-24 GB GB28990/29A patent/GB340286A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR37104E (en) | 1930-10-15 |
GB315821A (en) | 1930-08-18 |
DE539187C (en) | 1931-11-23 |
GB312338A (en) | 1930-06-10 |
GB340286A (en) | 1930-12-24 |
FR673502A (en) | 1930-01-16 |
DE553928C (en) | 1932-07-18 |
DE540412C (en) | 1931-12-23 |
GB312904A (en) | 1930-06-10 |
FR36770E (en) | 1930-09-13 |
FR37685E (en) | 1931-01-14 |
DE540413C (en) | 1931-12-23 |
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