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MEANS FOR INHIBITING FLUTTER IN A NUMERICAL DISPLAY

  • US 3,621,391 A
  • Filed: 08/21/1969
  • Issued: 11/16/1971
  • Est. Priority Date: 08/21/1969
  • Status: Expired due to Term
First Claim
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1. A numerical display system for visually displaying numerals indicative of a signal which is frequency modulated in response to a parameter to be measured, comprising:

  • a. means for sensing the frequency modulated signal at first periodic intervals;

    b. means for converting each sensed frequency modulated signal into a corresponding binary signal;

    c. a display device;

    d. means for transmitting binary signals to said display device for effecting a numerical display indicative of a sensed frequency modulated signal;

    e. means for preventing flutter of displayed numerals by inhibiting single digit changes in said binary signals from effecting said numerical display including, means for comparing one of the bits of each succeeding binary signal corresponding to later sensed frequency modulated signals with a corresponding bit of the preceding binary signal to inhibit transmission of succeeding binary signals which have single digit changes, said comparing means producing an inhibiting signal for inhibiting transmission of said succeeding binary Signals to said display device by said transmitting means when the polarities of successive signals have a first predetermined relationship and producing an enabling signal for effecting transmission of succeeding binary signals to said display device by said transmitting means when the polarities of said signals have a second predetermined relationship;

    f. means for coupling said inhibiting and enabling signals from said comparing means to said transmitting means to control transmission of said binary signals to said display device;

    g. updating means for effecting transmission of binary signals to said display device at second periodic intervals, regardless of the relationship of said successive signals.

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