GB312904A - Improvements in electrical telegraph and like signalling systems - Google Patents

Improvements in electrical telegraph and like signalling systems

Info

Publication number
GB312904A
GB312904A GB769429A GB769429A GB312904A GB 312904 A GB312904 A GB 312904A GB 769429 A GB769429 A GB 769429A GB 769429 A GB769429 A GB 769429A GB 312904 A GB312904 A GB 312904A
Authority
GB
United Kingdom
Prior art keywords
current
signal
biassing
coils
amplifier
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
Application number
GB769429A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US280709A external-priority patent/US1936153A/en
Priority claimed from US282381A external-priority patent/US1763880A/en
Priority claimed from US293816A external-priority patent/US1858037A/en
Priority claimed from US306123A external-priority patent/US1818463A/en
Application filed by Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB312904A publication Critical patent/GB312904A/en
Expired legal-status Critical Current

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)
  • Coils Or Transformers For Communication (AREA)
  • Electrotherapy Devices (AREA)
  • Superheterodyne Receivers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Ac-Ac Conversion (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

312,904. Electrical Research Products, Inc., (Assignees of Burton, E. T.). June 2, 1928, [Convention date]. Addition to 312,338. Transmitting systems for code telegraphy.- Relates to a signal transmission system of the type described in the parent Specification wherein the signal waves are shaped for high-speed transmission over a line, e.g. a submarine cable, by transformers having high permeability and adapted to carry a continuously flowing biassing current. As shown in Fig. 1, a signal transmitter 10 transmits impulses through transformers 13, 14, 15 to the grid circuit of a valve amplifier 11. The transformer 13 repeats only the lowfrequency current components, the high-frequency components being repeated over transformers 14, 15 which are provided with biassing coils 21, 22 and cores having high permeability. The biassing coils are wound in opposition and the currents therein cause the saturated condition of the cores to be maintained until the signal currents through the primary coils 17, 18 reach a definite positive or negative value to produce a state of de-energization for the production of a current impulse in one or other of the secondary coils 19, 20. In this manner an impulse occurs in each secondary coil to produce a double impulse at each reversal of the signal current. The secondary coils are connected to the grid of the amplifier 11 through networks 27, 28, 29 wherein the secondary impulses may be adjusted in phase and amplitude and undesired high frequency voltages may be suppressed. The resistance 24 and condensers 25, 26 constitute a filter circuit which prevents entry of high frequency signal current to the amplifier through the transformer 13. The low and high frequency components are combined for amplification and transmission over the line 12 which is connected to the output of the amplifier 11 at a point between the plate battery 30 and battery 32. Fig. 2 shows the various stages for producing a final wave form C from the original signal current A. The biassing currents are represented by lines d and the point at which the signalling current becomes effective to overcome the biassing effect is shown by lines e, the point of saturation of the transformer cores being represented by the lines f. When the signal current passes through the range e, f impulses B<11> are produced which combined with the curve B<1> form the final wave shape C. Specification 258,614 is referred to.
GB769429A 1928-05-26 1929-03-08 Improvements in electrical telegraph and like signalling systems Expired GB312904A (en)

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
GB312904A true GB312904A (en) 1930-06-10

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 (1)

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

Family Applications After (3)

Application Number Title Priority Date Filing Date
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

Country Status (3)

Country Link
DE (4) DE539187C (en)
FR (4) FR673502A (en)
GB (5) GB312338A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
FR36770E (en) 1930-09-13
DE540413C (en) 1931-12-23
GB312338A (en) 1930-06-10
GB315821A (en) 1930-08-18
GB340286A (en) 1930-12-24
DE539187C (en) 1931-11-23
FR37104E (en) 1930-10-15
GB318989A (en) 1930-09-25
FR673502A (en) 1930-01-16
DE540412C (en) 1931-12-23
FR37685E (en) 1931-01-14
DE553928C (en) 1932-07-18

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