A Fast-Response, Phase-Sensitive Demodulator and Modulator Circuit for the Improvement of Servo Systems.

摘要

The extensive use of synchros as data-transmission and error-sensing devices in automatic control systems suggests the need for improved circuitry to decrease the complexity of carrier-system compensation and, if possible, to increase the resolution of the synchros themselves. Past methods, while affording definite improvement in carrier-system performance, have not proved completely satisfactory because they inevitably introduce an unwanted time constant into the system. This added time constant often limits the degree of improvement that can be provided in the system. An electromechanical circuit that is a satisfactory solution to the dual problem of carrier-system compensation and synchro resolution is described. The circuit is essentially a fast-response demodulator and modulator unit that is simple to adjust and reliable in its application. Through its use, carrier systems can achieve a degree of performance hitherto unattainable. (Author)