Multi-input switching means

Abstract

A multiple input switching system includes an input isolation device, such as a transformer, in the input circuit. Switching devices are provided for sequentially connecting the several input circuits to a time-shared amplifier. The switching devices are actuated at a predetermined rate with a predetermined closed-time for each closure. Further switching devices are provided for transferring the data from each of the input circuits to a corresponding memory device. These further switching devices are operated synchronously with the first-mentioned switching devices but with a shorter close-time. The data values in the several memory devices may be selectively scanned asynchronously. Between each actuation of the input switching devices, additional switches are actuated which (1) short-circuits the input to the amplifier and (2) applies the output drift signal of the amplifier to a compensating storage capacitor. On subsequent actuation of the input and output switch devices, the compensating signal is superimposed on the data signal stored on the corresponding memory device.

Dependencies are inferred from the claim text.