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US2581426A - Arrangement for receiving telegraph impulses - Google Patents

Arrangement for receiving telegraph impulses Download PDF

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Publication number
US2581426A
US2581426A US716150A US71615046A US2581426A US 2581426 A US2581426 A US 2581426A US 716150 A US716150 A US 716150A US 71615046 A US71615046 A US 71615046A US 2581426 A US2581426 A US 2581426A
Authority
US
United States
Prior art keywords
arrangement
line
contacts
armature
receiving
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 - Lifetime
Application number
US716150A
Other languages
English (en)
Inventor
Mason Frederick Percival
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.)
Creed and Co Ltd
Original Assignee
Creed and Co Ltd
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
Application filed by Creed and Co Ltd filed Critical Creed and Co Ltd
Application granted granted Critical
Publication of US2581426A publication Critical patent/US2581426A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04L25/202—Repeater circuits; Relay circuits using mechanical devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/02—Details not particular to receiver or transmitter
    • H04L13/10—Distributors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/16—Apparatus or circuits at the receiving end
    • H04L17/30—Apparatus or circuits at the receiving end using electric or electronic translation

Definitions

  • This invention relates to a receiving arrangement for a printing telegraph system using combinations of impulses, each impulse consisting of one of two dilferent line conditions known as marking and spacing conditions existing during a denite interval of time.
  • the impulses When received, the impulses may have become distorted so that the appropriate condition, marking or spacing, does not persist throughout the whole of the time interval allotted thereto.
  • the theoretical duration of a printing telegraph signal impulse in the five-unit code is milliseconds at a speed of 50 bauds.
  • VThe maximum theoretical margin of a receiving arrangement is limited in part by the relay transit time which may be 0.5 milliseconds and in part by the minimum duration of time during which it is possible to read the condition of the line, which may be 1.5 milliseconds.
  • the line reading time thus causes a loss of margin of 71/% at 'a speed of 50 bauds, and this'is raised to SM10/z at a speed of 55 bauds.
  • the object of the present invention is to eliminate the time necessary for reading the nature of a signal impulse over and above thetransit time of the line relay.
  • Figs. 1 to 4 illustrate different arrangements according to the invention as applied to receiving arrangements for the well known ve-unit code.
  • the time devoted to each character is divided into ve intervals of equal duration each of which should be occupied by one of two different conditions
  • the time devoted' to each character is regarded as containing five intervals of equal duration, at the midpoint of each of which a change in condition of the line may take place.
  • the change of condition of the line may, owing t-o distortion, be displaced up to 10 milliseconds (for a speed of 50 bauds) in either early or late direction.
  • Fig. 1 this represents the simplest arrangement according to the invention.
  • the line L over which signals are received is connected toa receiving relay A.
  • the armature a of relay A is adapted to operate" between marking and spacing contacts m and s which are connected together and to ground. Whilst the armature a is resting on one of its contacts, a current passes from positive battery B6 through a resistance R3, the armature a and the contact to ground.
  • contacts C6 are normally closed so that when the armature a leaves itsmarking contact m in response to the start element ⁇ of asignal combination, the po in the anode circuit of the tube is energized and starts into rotation the shaft controlling the various contacts of the receiving arrangement.
  • Contacts Cl-C5 are operated in sequenceand if, during the interval when any one 'of ,these contacts is closed, a transit of the armature c between marking and spacing or between spacing and marking contact occurs the potential of battery B6 is connected Athrough resistance R3, the rectifier MRS and the particular contacts that are closed to one side of one of the condensers Iii-K5, the other side of which is connected to ground.
  • Contacts vC6 are opened, shortly after the commencement of rotation of the shaft and before the termination of the period of rotation of the shaft contacts Cl I5 are closed and the negative pole of a battery B1 is connected to the grid of tube T6 to extinguish the discharge therein.
  • Leak resistances LI-LS are Aprovided in shunt to the respective condensers -Kl-K5 so that should the charge on any charged condenser not be completely discharged during Vits connection to the grid of lits corresponding tube, and should lit also not be recharged before its next connection to its corresponding grid the charge willleak away.
  • the shaft controlling the contacts shown may start into rotation a further shaft controlling the printing action, or may close a contact to operate a printing magnet.
  • rectiers MRI, MR2 are provided to obtain a posi-v tive impulse for either direction of transit ci the armature.
  • the circuits an beso meer. there Papel ademen@ bf the armature does not provide sufficient energy to operate the gas-filled tubes 'FI-TE.
  • Receiving arrangement for .a printing telegraph system comprising ineans for registering consecutive changes in ⁇ the electrical condition of Aa signal line during reception over the line of a signal consisting of a series of consecutive elements each represented by a line condition, saidvmeans including a relay connected to said line and actuated by said changes, the relay vhaving an armature shifted between two contacts by each such change, a signal registering unit including a plurality oi registering elements, an operating circuit for said elements connected to the armature means for rendering the operating circuit effete only when the armature is out of engagement with said contacts, and means for connecting the operating circuit to said registering elements in succession during the periods of change-over from one signal element to the next; 'and means controlled by the registering means for producing corresponding simultaneous changes in the electrical conditions or" a plurality of Vprinting telegraph control lines.
  • each registering element includes a device actuated by current from said source.
  • Receiving arrangement for a printing telegraph system comprising means for registering consecutive changes in the electrical condition of a signal line during the reception over the line of a code signal consisting of a series of consecutive elements eachrepesented by a line condition, said means ⁇ voperable between successive elements of the code signal, said means including a relay connectedto said line and actuated by said changes.
  • the relay having an armature shiftable between two contacts by each such change, a signal registering unit; and means for operating said unit to register a signal element when said armature is shiftedgsaid last named means including an operating circuit connected to said armature, means for rendering said circuit effective only when lthe armature is out of engagement with said contact-s, and means controlled byl said registering means for producing corresponding'simultaneous changes in the electrical conditions of a plurality of printing telegraph tacts.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Near-Field Transmission Systems (AREA)
  • Linear Motors (AREA)
US716150A 1939-03-24 1946-12-13 Arrangement for receiving telegraph impulses Expired - Lifetime US2581426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB234891X 1939-03-24

Publications (1)

Publication Number Publication Date
US2581426A true US2581426A (en) 1952-01-08

Family

ID=10196428

Family Applications (1)

Application Number Title Priority Date Filing Date
US716150A Expired - Lifetime US2581426A (en) 1939-03-24 1946-12-13 Arrangement for receiving telegraph impulses

Country Status (4)

Country Link
US (1) US2581426A (fr)
CH (1) CH234891A (fr)
FR (1) FR863586A (fr)
GB (1) GB526833A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2658139A (en) * 1950-03-29 1953-11-03 Raytheon Mfg Co Binary decoding system
US2720557A (en) * 1948-12-24 1955-10-11 Bell Telephone Labor Inc Time division pulse code modulation system employing continuous coding tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1936947A (en) * 1931-10-05 1933-11-28 Western Union Telegraph Co Telegraph system
GB499209A (en) * 1937-07-16 1939-01-16 Creed & Co Ltd Improvements in or relating to printing telegraph systems and apparatus
US2444429A (en) * 1940-05-15 1948-07-06 Claud E Cleeton Pulse type telegraph transmitter and receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1936947A (en) * 1931-10-05 1933-11-28 Western Union Telegraph Co Telegraph system
GB499209A (en) * 1937-07-16 1939-01-16 Creed & Co Ltd Improvements in or relating to printing telegraph systems and apparatus
US2444429A (en) * 1940-05-15 1948-07-06 Claud E Cleeton Pulse type telegraph transmitter and receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720557A (en) * 1948-12-24 1955-10-11 Bell Telephone Labor Inc Time division pulse code modulation system employing continuous coding tube
US2658139A (en) * 1950-03-29 1953-11-03 Raytheon Mfg Co Binary decoding system

Also Published As

Publication number Publication date
GB526833A (en) 1940-09-26
FR863586A (fr) 1941-04-04
CH234891A (fr) 1944-10-31

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