US2153737A - Error detecting device for printing telegraph receivers - Google Patents

Error detecting device for printing telegraph receivers Download PDF

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Publication number
US2153737A
US2153737A US147398A US14739837A US2153737A US 2153737 A US2153737 A US 2153737A US 147398 A US147398 A US 147398A US 14739837 A US14739837 A US 14739837A US 2153737 A US2153737 A US 2153737A
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US
United States
Prior art keywords
relay
relays
marking
code
printing
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
US147398A
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English (en)
Inventor
James A Spencer
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.)
RCA Corp
Original Assignee
RCA Corp
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 to NL53380D priority Critical patent/NL53380C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US147398A priority patent/US2153737A/en
Priority to GB16445/38A priority patent/GB514588A/en
Priority to FR838986D priority patent/FR838986A/fr
Application granted granted Critical
Publication of US2153737A publication Critical patent/US2153737A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/47—Error detection, forward error correction or error protection, not provided for in groups H03M13/01 - H03M13/37
    • H03M13/51—Constant weight codes; n-out-of-m codes; Berger codes

Definitions

  • This invention relates to error detecting devices and has particularly to do with the provision of means for detecting errors of transirnission of code signals for printing telegraph apparatus.
  • Printing telegraph code signals are especially susceptible to distortion and to mutilation when transmited by radio channels. It is, therefore, an object of my invention to provide means for detecting instances of mutilation of.
  • a signalling code having equal intervals for each character and having preferably seven or eight time intervals allotted to each code sigml so that a fixed number of marking time intervals may be maintained independently ,of the character designation for each code signal.
  • a code signalling system in which the signals are of equal length and possess a fixed ratio other than 1 to 1 between the number of marking and spacing units. thereof has been disclosed in a copending application, Serial No. 78,348, filed May '7, 1936, by John B. Moore, et a1., and assigned to the assignee of the instant application.
  • a telegraph printer adapted tobe actuated by code signals of uniform length and having as many as seven or eight time elements in each code signal would require, of course, an equal number of selector bars. As explained in the application of Moore, et 2.1. above referred to, it is desirable that a fixed number of selector bars be actuated in making the selection of any character to be printed. If a shift key is employed, then seven units in the code signal would be sufiicient.
  • Each of the magnets 8 to Hi inclusive has as sociated therewith a pair of locking contacts l9 5 and an additional pair of make contacts 2b.
  • Another relay 22 is in circuit with the relay it but is adjusted to operate upon a strength resulting from the completion of more circuits in the resistance network Rl-R'l than there are normal marking elements in a code signal.
  • Still another relay 23 is in series with the relays 2i and 22 and is adjusted to operate on a current value derived from the completion of one or more circuits in the resistance network Rl-R'l.
  • the series circuit through the relays 2!, 22 and B5 23 leads eventually back to the direct current source and, say, the negative side thereof which, for the sake of simplicity in the description to follow, will be assumed to be grounded.
  • the armature 24 of relay 23 is also grounded and when drawn up to its front contact 25 puts ground potential on one side of an operating magnet 26.
  • the other side of the winding of magnet 26 leads to the armature of relay 22.
  • the back contact of relay 22 is connected to the armature of relay 2
  • and the front contact of relay 22 are both fed with positive potential through a resistor 21. designed that the operating magnet 26 may be energized upon the reception of a mutilated signal having either more or less than the standard number of marking impulses.
  • , 22 and 23 is actuated.
  • and 23 When the correct number of marking impulses has been received for the printing of a character of the message, relays 2
  • the locking circuits associated with the relays 8 to i l inclusive are opened at the end of each printing cycle by means of a contact 3
  • This printing bale is not shown because it is well known in printing apparatus of conventional types.
  • a printer selective means for causing said printer to print a character in response to the reception of a single unmutilated multi-element code signal, a plurality of code-element responsi e devices, code element impulse counting means comprising a plurality of parallel impedance circuits each respectively closable by one of said responsive devices, and means including a plurality of error-detecting relays operable under control of currents through said impedance circuits, said currents being established upon reception of a single mutilated code signal for causing an errorindicating character to be printed in place of the character intended to be selected by the first said means.
  • a printer having character selecting means responsive to a fixed number of marking elements of a uniform-length code signal, means for detecting instances of mutilation of the received signals, said means comprising a relay operable upon receipt of one or more marking impulses in a single one of said code signals, a second relay operable upon receipt of at least the normal number of markingimpulses in said code signal, and a third relay operable only upon receipt of a superfluous marking impulse in said cod signal, and means to print an error-indicating character in response to the cooperation of said relays when operated upon receipt of an abnormal number of marking impulses.
  • a printing telegraph apparatus having a plurality of de-coding members each actuable in response to the reception of a marking element or a code signal.
  • type selecting elements each selectable upon the actuation of a fixed and uniformly normal number of said de-coding members, and means for indicating instances of mutilation of a code signal, said means comprising an electro-magnetic type-selecting element, a plurality of relays differentially biased, thereby to respond to currents of respectively difierentamplitudes, said relays being cooperatively actuable to energize the last said type-selecting element upon reception of an abnormal number of marking impulses in the time interval allotted to a single code signal, and a plurality of impedance circuits each closable respectively upon the actuation of one of said de-coding members, said circuits being connected in parallel with one another and in series with all of said relays thereby to control the number of said relays to be actuated in dependence upon the amplitude of the current traversing said relays
  • code signal receiving apparatus a receiving printer having characterselecting elements, means-including a plurality of de-coding members operable in response to unrepeated signals for controlling the actuation allocate? nectec, c, reloy system in series with soicl imehcc circuits, one means operchie under con- W oi ashamed releiy system when n mutilated cheructerjsignel is received for causing an error innicotine character to be prin 5.
  • An arrangement in accordance with claim 4 end hsving three relays in said relay system, one of sold relays being operable by the minimum cur rent fed through one of sciclimpedances, a secand relcy being operable whenever current is fed thereto cimuitroneously through st least the numher oi solo impedcnces corresponding with the normal number of marking impulses in c. code signel, end a. third relay operable whenever current is fed; thereto simultaneously through a. nnmher of said impedsnces in excess of the normal number of said marking impulses.
  • e telegraph prlnter'for equal length codes means responsive to the reception of s mutilated signci hoving more or less than c. predetermined unvevrying number of marking impulses by which oil the code signals are characterined for making en error indication, said means comprising e piwclity of series-connec relays each operable when tee with current of u'predetermined litucie cine comprimng her on error l ing tyne memheroperohle when one only of ssicl reloys is, or oil oi" the score ore cctueteri, and means including o csreliel rearrangement of. incpedonces in series with said reieys cndi. closcole in accordance with the reception of men-king impulses in each signal for deter the number of sold relays to he octucted.

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  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
US147398A 1937-06-10 1937-06-10 Error detecting device for printing telegraph receivers Expired - Lifetime US2153737A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL53380D NL53380C (enrdf_load_stackoverflow) 1937-06-10
US147398A US2153737A (en) 1937-06-10 1937-06-10 Error detecting device for printing telegraph receivers
GB16445/38A GB514588A (en) 1937-06-10 1938-06-01 Improvements in or relating to printing telegraph apparatus
FR838986D FR838986A (fr) 1937-06-10 1938-06-08 Dispositif servant à déceler des erreurs pour des récepteurs télégraphiques imprimeurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US147398A US2153737A (en) 1937-06-10 1937-06-10 Error detecting device for printing telegraph receivers

Publications (1)

Publication Number Publication Date
US2153737A true US2153737A (en) 1939-04-11

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ID=22521415

Family Applications (1)

Application Number Title Priority Date Filing Date
US147398A Expired - Lifetime US2153737A (en) 1937-06-10 1937-06-10 Error detecting device for printing telegraph receivers

Country Status (4)

Country Link
US (1) US2153737A (enrdf_load_stackoverflow)
FR (1) FR838986A (enrdf_load_stackoverflow)
GB (1) GB514588A (enrdf_load_stackoverflow)
NL (1) NL53380C (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451319A (en) * 1948-10-12 Totalizator indicator control
US2471126A (en) * 1946-10-24 1949-05-24 Rca Corp Code converter and error detector
US2508554A (en) * 1948-03-06 1950-05-23 Rca Corp Error detector for start-stop telegraph printers
US2520142A (en) * 1946-04-24 1950-08-29 Standard Telephones Cables Ltd Code translator
US2523300A (en) * 1946-08-17 1950-09-26 Standard Telephones Cables Ltd Printer telegraph circuit
US2540226A (en) * 1947-12-20 1951-02-06 Ncr Co Electromechanical storage mechanism
US2552126A (en) * 1946-10-24 1951-05-08 Hendrik C A Van Duuren System for the transmission of telegraph signs on a radio path by means of a double wave
US2557964A (en) * 1946-08-17 1951-06-26 Standard Telephones Cables Ltd Error detector for telegraph printers
US2622148A (en) * 1948-03-15 1952-12-16 Nederlanden Staat Error detector for telegraph printer codes
US2724739A (en) * 1953-06-16 1955-11-22 Rca Corp Code conversion system
US2737647A (en) * 1952-10-25 1956-03-06 Monroe Calculating Machine Keyboard alarm
US2900447A (en) * 1953-09-24 1959-08-18 Siemens Ag Apparatus for correcting the effects of disturbances in telegraphic communication
US3335402A (en) * 1963-04-11 1967-08-08 Clare & Co C P Code checking circuit
US3418630A (en) * 1963-10-15 1968-12-24 Nederlanden Staat Double check signal test self-correcting communication system
US8771184B2 (en) 1993-09-04 2014-07-08 Body Science Llc Wireless medical diagnosis and monitoring equipment

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451319A (en) * 1948-10-12 Totalizator indicator control
US2520142A (en) * 1946-04-24 1950-08-29 Standard Telephones Cables Ltd Code translator
US2523300A (en) * 1946-08-17 1950-09-26 Standard Telephones Cables Ltd Printer telegraph circuit
US2557964A (en) * 1946-08-17 1951-06-26 Standard Telephones Cables Ltd Error detector for telegraph printers
US2552126A (en) * 1946-10-24 1951-05-08 Hendrik C A Van Duuren System for the transmission of telegraph signs on a radio path by means of a double wave
US2471126A (en) * 1946-10-24 1949-05-24 Rca Corp Code converter and error detector
US2540226A (en) * 1947-12-20 1951-02-06 Ncr Co Electromechanical storage mechanism
US2508554A (en) * 1948-03-06 1950-05-23 Rca Corp Error detector for start-stop telegraph printers
US2622148A (en) * 1948-03-15 1952-12-16 Nederlanden Staat Error detector for telegraph printer codes
US2737647A (en) * 1952-10-25 1956-03-06 Monroe Calculating Machine Keyboard alarm
US2724739A (en) * 1953-06-16 1955-11-22 Rca Corp Code conversion system
US2900447A (en) * 1953-09-24 1959-08-18 Siemens Ag Apparatus for correcting the effects of disturbances in telegraphic communication
US3335402A (en) * 1963-04-11 1967-08-08 Clare & Co C P Code checking circuit
US3418630A (en) * 1963-10-15 1968-12-24 Nederlanden Staat Double check signal test self-correcting communication system
US8771184B2 (en) 1993-09-04 2014-07-08 Body Science Llc Wireless medical diagnosis and monitoring equipment

Also Published As

Publication number Publication date
GB514588A (en) 1939-11-13
FR838986A (fr) 1939-03-21
NL53380C (enrdf_load_stackoverflow)

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