Importance

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Abstract

Received periodic pulses of varying amplitude, representing a measured analog signal, are alternately applied to two interpolation channels through gates alternately activated by a flip-flop element responsive to each incoming pulse. Each channel converts the applied pulses into an interpolated value which is summed with that of the other channel to substantially reproduce the original analog signal value. In a first specific arrangement, each pulse is converted, by the integration of the stored pulse amplitude, into a triangular shaped signal having a height equal to the corresponding pulse amplitude and a base equal to twice the pulse spacing. The successive triangular signals from each channel, each overlapping the adjacent pulse signals from the other channel, are summed to produce an interpolated analog output substantially equivalent to the original analog signal. In a second arrangement, the triangular pulses are formed by generating sine and cosine functional waves with the amplitude of each single half cycle selected in accordance with that of the corresponding digital pulse. A third arrangement uses cosine.sup.2 functions to provide the interpolation values.

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First Claim