Control of display devices with electromagnetic drums
AssigneeJaeger
InventorJoel Choisnet
Life of this patent
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Abstract
A control device for digital display indicators using electromagnetic drums. An analogue/digital converter converts the information to be displayed, received in analogue form E, into digital information which can be utilized by the drums of the display device. The renewal frequency of the information delivered by the analogue/digital converter is made a function of the rate of change of the information by means of a differentiator which calculates the derivative dE/dt and a means of comparing voltages and/or frequencies and means of controlling the analogue/digital converter and/or all or a proportion of the display drums.
Claims6
A control device for digital display indicators having electromagnetic drums of the type containing an analogue/digital convertor capable of receiving in analogue form an information to be displayed, the convertor having an output connected to the digital display indicator drums and a second input for controlling the rate of conversion operations at a selected frequency, the improvement comprising:
- a differentiating circuit capable of producing as its output the time derivative of the quantity inputted to it;
- and
- circuit means, whose input is connected to the output of said differentiating circuit, for producing as its output a selected frequency depending on quantity inputted to it,
- whereby when the quantity inputted to said differentiating circuit is the same as the information inputted to said analogue/digital convertor and the output of said circuit means is connected to the second input of said analogue/digital convertor, the rate of conversion of the analogue/digital convertor is controlled by the time rate of change of the information to be displayed.
Dependencies are inferred from the claim text.