GB1193311A - Digital Instruments - Google Patents

Digital Instruments

Info

Publication number
GB1193311A
GB1193311A GB40018/67A GB4001867A GB1193311A GB 1193311 A GB1193311 A GB 1193311A GB 40018/67 A GB40018/67 A GB 40018/67A GB 4001867 A GB4001867 A GB 4001867A GB 1193311 A GB1193311 A GB 1193311A
Authority
GB
United Kingdom
Prior art keywords
stable device
count
counter
displayed
output
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
GB40018/67A
Inventor
David Trevor Ashworth
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 GB40018/67A priority Critical patent/GB1193311A/en
Priority to BE720274D priority patent/BE720274A/xx
Priority to FR1599742D priority patent/FR1599742A/fr
Publication of GB1193311A publication Critical patent/GB1193311A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H03K21/02—Input circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/001—Analogue/digital/analogue conversion

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Meter Arrangements (AREA)

Abstract

1,193,311. Digital displays. STANDARD TELEPHONES & CABLES Ltd. 1 Sept., 1967, No. 40018/67. Heading G4H. To eliminate jitter in the last digit of a displayed count in which, whilst incoming pulses are being counted for a fixed time interval, the result of the preceding count is displayed, the incoming pulses are fed via a bi-stable device 7 (Figs. 3, 4) to the counter and, if at the end of the fixed interval, the bi-stable device is in its one state and the lowest digit a s of the count being displayed differs from the lowest digit a held in the counter a correction pulse is added in. In one embodiment (Fig. 3) at the end of the count, the output a of the least significant flipflop in the lowest decade of the counter is compared with the inverse a s of the least significant digit being displayed and if they are the same a " 1 " output from NAND gate 12 results in the output of AND gate 15 being " 0 " when a jitter correction pulse is applied so that, if the bi-stable device 7 is in its " 1 " state the zero output of NAND gate 8 is inverted and a pulse applied to the counter. In the second embodiment (Fig. 4) the gates precede the bi-stable device, the pulse fed to the bi-stable device if a and a s differ only affecting the count if the bi-stable device is in its " 1 " state.
GB40018/67A 1967-09-01 1967-09-01 Digital Instruments Expired GB1193311A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB40018/67A GB1193311A (en) 1967-09-01 1967-09-01 Digital Instruments
BE720274D BE720274A (en) 1967-09-01 1968-09-02
FR1599742D FR1599742A (en) 1967-09-01 1968-09-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB40018/67A GB1193311A (en) 1967-09-01 1967-09-01 Digital Instruments

Publications (1)

Publication Number Publication Date
GB1193311A true GB1193311A (en) 1970-05-28

Family

ID=10412759

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40018/67A Expired GB1193311A (en) 1967-09-01 1967-09-01 Digital Instruments

Country Status (3)

Country Link
BE (1) BE720274A (en)
FR (1) FR1599742A (en)
GB (1) GB1193311A (en)

Also Published As

Publication number Publication date
FR1599742A (en) 1970-07-20
BE720274A (en) 1969-03-03

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees