Abstract: A step data to synchro converter for coupling one of a plurality of different step data transmitters to one of a plurality of different synchro receivers. The output of the step data transmitter is applied to an interface circuit and processed into a three bit binary code suitable for actuating a plurality of switching means. The switching means selectively apply an in-phase and an out-of-phase output of a transformer, which is responsive to the synchro receiver's reference voltage and frequency source, to a plurality of transformers associated with the input stator windings of the synchro receiver. The output of the plurality of transformers is a drive signal which satisfactorily approximates synchro data.

Abstract: A synchro-to-step data converter for coupling one of a plurality of different synchro transmitters to one of a plurality of different step motors. The three wire output data of a synchro transmitter is demodulated into a three bit binary step data code and is applied to digital decoding means. The digital decoding means converts the step data code into a format suitable for application to a particular step motor and/or compensates for the speed of the synchro input shaft relative to the step motor output shaft.

Abstract: A device for automatically controlling the intensity of light impinging on the face plate of a television camera includes a shutter which is operated through a pulse width modulator so as to be opened for a length of time which varies inversely with the intensity of light entering the imaging light path between the scene and the camera.

Abstract: An oscillating apparatus allowing for synchronization to an external sinusoidal source, and in which a unidirectional element is so located that the oscillating device may be replaced without the necessity of altering circuit elements to maintained synchronization and the desired nominal frequency of operation.

Abstract: A switching circuit which is actuated when the frequency of an input signal falls below a specified value, includes an input circuit for providing a rectangular pulse train consisting of pulses having durations indicative of the frequency of the input signal. The rectangular wave train is used to actuate a pair of one-shot multivibrators adjusted to produce output pulses having durations such that the pulses from the first one-shot correspond to an upper reference frequency slightly below that of a nominal input frequency, and the pulses from the second one-shot correspond to a lower reference frequency equal to the minimum acceptable input frequency. The output signals from the one-shot multivibrators are applied to clock terminals of first and second edge-triggered flip-flops, whereas the D input terminals of the same flip-flops are actuated by the rectangular pulse train.