RC Memory Commutator for Signal-to-Noise Improvement

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Abstract
An electromechanical circuit device is described capable of displaying with small time delay a low frequency, periodic signal wave form initially obscured by noise. The device chops the signal into a large number of intervals, integrates the noise and measures the average value of signal in each interval, and stores these measured values for subsequent presentation. Analysis of the fidelity of signal reproduction and the noise suppression characteristics is included. Rejection ratios of 60 cps interference of 85:1 have been realized. Salient electrical and mechanical features are mentioned to facilitate the construction of other units.