US2971055A - Circuit arrangement for checking the faultless transmission of teleprinting characters - Google Patents

Circuit arrangement for checking the faultless transmission of teleprinting characters Download PDF

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Publication number
US2971055A
US2971055A US723597A US72359758A US2971055A US 2971055 A US2971055 A US 2971055A US 723597 A US723597 A US 723597A US 72359758 A US72359758 A US 72359758A US 2971055 A US2971055 A US 2971055A
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United States
Prior art keywords
code
checking
characters
transmission
teleprinting
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
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US723597A
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English (en)
Inventor
Grottrup Helmut
Schiebeler Werner
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority claimed from GB1900758A external-priority patent/GB826828A/en
Application granted granted Critical
Publication of US2971055A publication Critical patent/US2971055A/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 a circuit arrangement for checking the faultless transmission of teleprinter characters, in particular for the use in the data processing field.
  • the checking of the faultless transmission has become of particular importance in the data processing field, because in many applications the processing results are not only supposed to be printed out or perforated into punched cards, but also electrically transmitted over greater distances.
  • the processing results have to be punched into a perforated tape from which the informations are transmitted.
  • the arriving pulses are again fed to a data processing machine and are printed, perforated or otherwise recorded by this machine. It is also possible however, for the purpose of effecting the electrical transmission, to take the necessary pulses directly from the data processing machine.
  • perforated in a perforated tape may now be easily checked with respect to its accuracy, by determining whether two and only two signal elements are of the current type.
  • the voltage U is in such cases used for effecting an alarm.
  • the object of the present invention to provide a bridge circuit which is capable of selectively checking all of the employed codes. Furthermore the bridge circuit is supposed to be capable of being automatically switched over from one to another code.
  • the present invention relates to a circuit arrangement for checking the Masless transmission of different kinds of codes, especially when employed in the data processing field, in which as a checking element there is used a Wheatstone bridge circuit, in the one branch of which there is arranged a step-by-step resistance, the number of steps of which depends upon the number of code elements, and the steps of which are capable of being bridged by contacts actuated by the perforating needles or any other coding devices.
  • This bridge circuit being employed in such a way that to the one diagonal thereof there is applied a constant voltage U and .from the second diagonal of which there may be taken a testing voltage for the controlling of alarm systems, and which testing voltage will be produced, i.e., will only be produced in the case when more of less steps are bridged than correspond to the code employed.
  • a resistance which, in dependency upon the employed code, is variable in a stepby-step manner and which permits the selective checking of different codes in the same bridge circuit.
  • the switching-over maybe effected by means of a switch actuated in accordance with the employed code.
  • the controlling of the switch may be effected by the transmitting machine itself when provisions are made that the characters associated with one code will arrive from one certain machine, respectively from one certain part of a machine.
  • the characters to be transmitted there may be fundamentally distinguished between three parts from which the characters to be transmitted will arrive, namely, firstly from the figure keyboard or the printing mechanism, secondly from the programming bar determining the carriage positions, and thirdly from different other parts of the machine adapted to transmit some sorts of functional characters.
  • the symbols to be transmitted are assembled to groups of symbols for figures, carriage positions, and other functions, and to each group of symbols there are assigned groups of teleprinter signals of the self-checking type. Then the transmitting parteof the machine may be used as a switch-over indication or criterion for the variable resistance.
  • the controlling of the switch may also be accomplished by means of special function signals which are inserted between the different groups of symbols.
  • this voltage divider R is split into equal bridgeable partial resistances'which are capable of being bridged at will by the switch S.
  • These partial resistances R R have the same resistance values as the resistances R R
  • the switch S will have to be brought into the pOSitiOIl so that the partial resistance R5 will be bridged.
  • the perforating needles Upon actuation of the perforating needles always two of the contacts k k will be closed. During the time of closure of these contacts there is actuated the test key Pic, causing the telegraph relay TR to be applied to the output voltage of the rectifier Gl.
  • This telegraph relay TR serves the actuation of some sort of alarm system, for example, the data processing machine may be blocked until theperfora'tionhas b'eencorrecte'd.
  • the telegraph relay there may also' be connected another kind of trigger arrangement, such as a flip-flop or thyratron.
  • bridgecircuit for this checking purpose is in no way bound to a five-unit code but, when correspondingly modified, the bridge circuit may also be usede.g. for a3 out of 7 code.
  • inventive circuit arrangement is not only suitable for employment in cases where'thetapes are perforated by business machines, but in the general teleprinting field, as far'as only character'sorrespectively groups of character's are employed'which are capableof being tested.
  • a constant voltage power source and first and second parallel circuit branches connected thereacross thefirst circuit branch including a plurality of firstimpedance elements connected in series with a'first equalizing impedance and the second circuit branch including a plurality' of second impedance elements connected in series with a second equalizing impedance, means for shunting respective ones of said first impedance elements, said first impedance elements and associated shunting means corresponding respectively to the signals in a teleprinter code signal combination, code selecting means; mean's'for op erating said code-selecting means to shunt any predetermined number of said second impedance elements to provide a predetermined impedance in said second branch, means responsive to the'transmission of any said code signal combination for operating the respectively corresponding first-element shunting means to provide a corresponding reduced impedance in sai'd first branch, and'de- 'tector means connected

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  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
US723597A 1957-03-23 1958-03-24 Circuit arrangement for checking the faultless transmission of teleprinting characters Expired - Lifetime US2971055A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2971055X 1957-03-23
GB1900758A GB826828A (en) 1958-06-13 1958-06-13 Circuit arrangement for checking the faultless transmission of teleprinter characters

Publications (1)

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US2971055A true US2971055A (en) 1961-02-07

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US723597A Expired - Lifetime US2971055A (en) 1957-03-23 1958-03-24 Circuit arrangement for checking the faultless transmission of teleprinting characters

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3175190A (en) * 1961-02-15 1965-03-23 Itt Machine tool control circuit having a program crossbar switch and a bridge means for checking crosspoints
US3284771A (en) * 1960-03-14 1966-11-08 Siemens Ag Circuit arrangement for ascertaining faulty telegraph symbols

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181038A (en) * 1961-11-15 1965-04-27 Leo E Feldhake Control circuit for switching device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489328A (en) * 1946-10-07 1949-11-29 Farnsworth Res Corp Electron beam controlling system
US2594716A (en) * 1948-05-22 1952-04-29 Hays Corp Electronic program controller
US2673960A (en) * 1950-03-22 1954-03-30 Bell Telephone Labor Inc Thermistor measuring apparatus
US2681431A (en) * 1951-05-09 1954-06-15 Honeywell Regulator Co Rebalanceable alternating-current bridge for frequency measurement
US2828481A (en) * 1953-08-19 1958-03-25 Saint Chamond Granat Device for controlling the correspondence of the positions of two movable members in relation to stationary members
US2834937A (en) * 1954-06-24 1958-05-13 Lever Brothers Ltd Conductivity bridges

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489328A (en) * 1946-10-07 1949-11-29 Farnsworth Res Corp Electron beam controlling system
US2594716A (en) * 1948-05-22 1952-04-29 Hays Corp Electronic program controller
US2673960A (en) * 1950-03-22 1954-03-30 Bell Telephone Labor Inc Thermistor measuring apparatus
US2681431A (en) * 1951-05-09 1954-06-15 Honeywell Regulator Co Rebalanceable alternating-current bridge for frequency measurement
US2828481A (en) * 1953-08-19 1958-03-25 Saint Chamond Granat Device for controlling the correspondence of the positions of two movable members in relation to stationary members
US2834937A (en) * 1954-06-24 1958-05-13 Lever Brothers Ltd Conductivity bridges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284771A (en) * 1960-03-14 1966-11-08 Siemens Ag Circuit arrangement for ascertaining faulty telegraph symbols
US3175190A (en) * 1961-02-15 1965-03-23 Itt Machine tool control circuit having a program crossbar switch and a bridge means for checking crosspoints

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Publication number Publication date
BE565985A (en))

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