Digital control circuit for an analog servo

Claim 1

In a simulator training apparatus having a plurality of operations controlled in response to information from a digital computer and at least some of said operations having moveable parts connected for movement by an analog drive servo motor, a digital control circuit to actuate said analog servo motor in response to said digital information, comprising: control means responsive to a clocked timing signal from said digital computer for timing and control of the other component circuits of said digital control circuit, means to receive digital information from said computer to provide a digital signal indicative of a new servo position, separate means to receive digital information from said computer to provide a digital signal indicative of a velocity of movement, feedback circuit means including means to receive information from said servo indicative of actual present servo position, computational circuit means to generate a digital output signal responsive to digital information from each of said means to receive, from said control means, and from said feedback circuit means, so that said digital output signal is sufficient to cause said servo to move from its actual present position to said new servo position in a predetermined manner, and digital-to-analog converter circuit means to convert said digital output signal from said computational circuit means into analog form to actuate said analog servo motor in said predetermined manner.