Control of display devices with electromagnetic drums

Details Control of display devices with electromagnetic drums Control of display devices with electromagnetic drums

1979-10-12

1981-08-11

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

3403782, G08B 530

Patent

active

042837154

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.

REFERENCES:
patent: 3007637 (1961-11-01), Meirowitz
patent: 3794972 (1974-02-01), Van Ostrum
patent: 3846749 (1974-11-01), Curry
patent: 4161782 (1979-07-01), McCracken

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