GB730854A - Improvements in or relating to code comparators - Google Patents

Improvements in or relating to code comparators

Info

Publication number
GB730854A
GB730854A GB13417/51A GB1341751A GB730854A GB 730854 A GB730854 A GB 730854A GB 13417/51 A GB13417/51 A GB 13417/51A GB 1341751 A GB1341751 A GB 1341751A GB 730854 A GB730854 A GB 730854A
Authority
GB
United Kingdom
Prior art keywords
terminals
valve
code
positive
complementary
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
GB13417/51A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 FR1106253D priority Critical patent/FR1106253A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB13417/51A priority patent/GB730854A/en
Publication of GB730854A publication Critical patent/GB730854A/en
Priority claimed from US827650A external-priority patent/US2979695A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

730,854. Digital electrical calculating apparatus. STANDARD TELEPHONES & CABLES, Ltd. (Materiel Telephonique Soc. Anon.). June 6, 1951, No. 13417/51. Class 106 (1). [Also in Group XL (b)] Apparatus for comparing characters in a multi-condition code in which each code element is expressed as one of a plurality of electrical values, e.g. potentials, comprises a plurality of test devices, each individual to one set of corresponding code elements of the characters to be compared, and each adapted when a set of code elements applied thereto have a predetermined relation to cause the electrical condition of a reference point individual to said test device to assume 'a particular value and means responsive to the assumption by all of said reference points of predetermined particular values to give an indication that said characters have a predetermined relation. The circuit shown is used to detect a binary type code set up as positive and.negative voltages on terminals 6, 7, 8 by comparing it with the complementary code applied to the respective terminals 9, 10, 11, the complementary voltages being positive and negative. If positive voltage is applied to the terminals 6, 9 the point 18 assumes a positive voltage and current flows through rectifier 19 and resistance 25 to junction 27 and ground, and the grid of the valve 1 becomes markedly positive. The grid of the valve 2 is at substantially ground potential, and the conducting operation of the valve 1 makes the cathode of both valves positive so that the valve 2 cannot conduct. If negative voltage is applied to the terminals 6, 9 current flows through resistance 26 and rectifier 20 so that the voltage on the grid of the valve 2 becomes markedly negative and the valve is non-conducting. Similar considerations apply to terminals 7, 10 and 8, 11. The valve 2 can conduct, therefore, solely if the voltages at terminals 6 and 9, 7 and 10, 8 and 11 are complementary and if a code combination is applied to the terminals 6, 7 and 8, the valve 2 will remain non-conducting until the complementary code combination is applied to the terminals 9, 10 and 11. A predetermined incoming character may be detected by applying the complementary character to the terminals 6, 7, 8 and the incoming character to the terminals, 9, 10, 11. Specification 674,595 is referred to.
GB13417/51A 1951-06-06 1951-06-06 Improvements in or relating to code comparators Expired GB730854A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR1106253D FR1106253A (en) 1951-06-06 1950-03-03 Comparator circuits for electrical quantities such as signaling codes
GB13417/51A GB730854A (en) 1951-06-06 1951-06-06 Improvements in or relating to code comparators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB13417/51A GB730854A (en) 1951-06-06 1951-06-06 Improvements in or relating to code comparators
US827650A US2979695A (en) 1959-07-16 1959-07-16 Comparator device

Publications (1)

Publication Number Publication Date
GB730854A true GB730854A (en) 1955-06-01

Family

ID=33100005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13417/51A Expired GB730854A (en) 1951-06-06 1951-06-06 Improvements in or relating to code comparators

Country Status (2)

Country Link
FR (1) FR1106253A (en)
GB (1) GB730854A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909769A (en) * 1955-11-07 1959-10-20 Datex Corp Code comparison and control system
US3015088A (en) * 1957-11-25 1961-12-26 North American Aviation Inc Automatic interlock system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909769A (en) * 1955-11-07 1959-10-20 Datex Corp Code comparison and control system
US3015088A (en) * 1957-11-25 1961-12-26 North American Aviation Inc Automatic interlock system

Also Published As

Publication number Publication date
FR1106253A (en) 1955-12-16

Similar Documents

Publication Publication Date Title
US2752489A (en) Potential comparing device
GB680798A (en) Improvements in signal code converters, for example for telegraph systems
GB730854A (en) Improvements in or relating to code comparators
GB574492A (en) Improvements in or relating to apparatus for sensing electrically conductive marks on record cards or sheets of moisture absorbent material
US2338218A (en) Time-measuring device
US3183404A (en) Control circuits for multicathode indicating devices
GB753918A (en) Electrical multiplication circuit
GB711053A (en) Electronic switching systems
US3553530A (en) Automatically resetting overvoltage protection means for an alternating current circuit
US2909657A (en) Device for indicating the presence of a pulse group with certain determined time intervals between the pulses included therein
GB707199A (en) Valve clipping circuit
US2381727A (en) Automatic and semiautomatic telephone exchange system
CN211627669U (en) Picoampere-level low-current test circuit suitable for ATE test
GB752412A (en) Electrical circuits including semi-conductor devices
GB712800A (en) Improvements in and relating to binary digital computing devices
US2799806A (en) Electrical gas discharge tube circuits
SU132328A1 (en) Magnetoelectric Detector Voltmeter
GB784367A (en) Improvements in or relating to an apparatus for comparing the current/voltage characteristics of two non-linear resistances
US2901690A (en) Interchangeable tube cap circuit
GB685218A (en) Improvements in or relating to electronic digital computing devices
GB747027A (en) Improvements relating to the protection of electric meter and like circuits against excess voltage
US1841394A (en) Circuit for space discharge devices
GB619077A (en) Electrical control system
ES293925A1 (en) Selective electric circuit blocked diodes adequate to establish connections (Machine-translation by Google Translate, not legally binding)
GB618438A (en) Improvements relating to electric subtracting circuits