ERROR ANALYSIS OF THE RECOVERY OF DATA ACQUIRED BY A VOLTAGE-TO- FREQUENCY DATA ACQUISITION SYSTEM FOR SINUSOIDAL, STEP, AND RAMP INPUTS
Final rept. Apr 1967-Jun 1968
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The errors generated by the recovery of data acquired by a voltage- to-frequency VF data acquisition system are theoretically analyzed, using a digital computer. The input waveforms considered are the sinusoid, the step function, and the ramp function. In each case, the well known sampling theorem of C. E. Shannon, viz, two samples per period of the smallest period present in the signal are sufficient for recovery of data with perfect fidelity, will be shown to be inapplicable as a criterion for accurate and reliable recovery of data acquired by a VF system. The errors are of two categories One is the error from linear interpolation recovery, and the other is from the fact that data points do not always coincide with the input.