GB894986A - Improvements in or relating to code converters - Google Patents

Improvements in or relating to code converters

Info

Publication number
GB894986A
GB894986A GB49359A GB49359A GB894986A GB 894986 A GB894986 A GB 894986A GB 49359 A GB49359 A GB 49359A GB 49359 A GB49359 A GB 49359A GB 894986 A GB894986 A GB 894986A
Authority
GB
United Kingdom
Prior art keywords
register
constants
detector
negative
respect
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
GB49359A
Inventor
Donald Wynn Davies
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB49359A priority Critical patent/GB894986A/en
Priority to FR814862A priority patent/FR77114E/en
Publication of GB894986A publication Critical patent/GB894986A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
    • G06F11/1012—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error
    • G06F11/104—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error using arithmetic codes, i.e. codes which are preserved during operation, e.g. modulo 9 or 11 check
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/02—Conversion to or from weighted codes, i.e. the weight given to a digit depending on the position of the digit within the block or code word
    • H03M7/12—Conversion to or from weighted codes, i.e. the weight given to a digit depending on the position of the digit within the block or code word having two radices, e.g. binary-coded-decimal code

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

894,986. Digital electric calculating-apparatus. STANDARD TELEPHONES & CABLES Ltd. Jan. 1, 1960 [Jan. 6, 1959], No. 493/59. Class 106 (1). A code converter converts a pure binary number into binary coded decimal or sterling by repeated addition and/or subtraction of a diminishing series of binary coded constants, the result of each addition or subtraction, according to whether it is positive or negative, causing a 1 or a 0 to be applied to the output. The number to be converted is entered into conversion register 2 in series mode. According to whether the sign is positive or negative in cell 3 detector 9 connects register 2 to subtractor 6 or adder 5. At the same time counter 22 actuates constants selector 26 to select the appropriate senior constant. On the decimal scale this is 8 x 10<SP>n</SP> and is selected in known manner from inspection of the contents of register 2. This constant is added to or subtracted from the original number and re-entered into register 2. According to whether the sign in cell 3 is now + or -, the detector 9 through register selector 10 enters 1 or 0 in the first place of register 11. The process repeats using as constants 4 x 10<SP>n</SP>, 2 x 10<SP>n</SP> and 1 x 10<SP>n</SP>, after which the next entries are made in register 12 in respect of the next decimal denomination. If as a result of the least step in respect of a denomination the number in the register 2 is negative, detector 9 inhibits counter 22 and the constant concerned is re-added to the number. The output registers 11-21 may control card punches. In respect of binary to sterling conversions a different set of constants is used and the series includes a few constants which are repeated.
GB49359A 1959-01-06 1959-01-06 Improvements in or relating to code converters Expired GB894986A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB49359A GB894986A (en) 1959-01-06 1959-01-06 Improvements in or relating to code converters
FR814862A FR77114E (en) 1959-01-06 1960-01-05 Digital calculator system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB49359A GB894986A (en) 1959-01-06 1959-01-06 Improvements in or relating to code converters

Publications (1)

Publication Number Publication Date
GB894986A true GB894986A (en) 1962-04-26

Family

ID=9705316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB49359A Expired GB894986A (en) 1959-01-06 1959-01-06 Improvements in or relating to code converters

Country Status (2)

Country Link
FR (1) FR77114E (en)
GB (1) GB894986A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932739A (en) * 1973-09-10 1976-01-13 Rockwell International Corporation Serial binary number and BCD conversion apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932739A (en) * 1973-09-10 1976-01-13 Rockwell International Corporation Serial binary number and BCD conversion apparatus

Also Published As

Publication number Publication date
FR77114E (en) 1962-01-19

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