Function generator for linear interpolation

Claim 1

A generator of a function z (x, y) of at least two variables x, y, which comprises in combination: a linear interpolator of a function of y for the field of values yo, y1, y2, ... yn, of y, constituted by: a first channel (l2) comprising an integrator and supplied with a negative supply voltage, a second channel (L2) comprising an integrator and supplied with a negative supply voltage; n other channels (L''1, L''2, L''3,- L''n), called direct input channels, supplied by voltages k y1, k y2, k y3,- k yn respectively: n other channels (L''''1, L''''2, L''''3,- L''''n), called indirect input channels and comprising a gate (P1, P2, 3,- Pn), a last channel (L''''o) of indirect input without a gate; each of said channels having an input and at least one outlet; a first comparator comparing the voltage at the output of the first channel (L1) with the voltage at the output of the second channel (L2) and emitting a signal of equality when these two voltages are equal; n other comparators (C1, C2, C3,- Cn) each comparing the voltage at the output of the second channel (L2) with the voltage at the output of one of the n direct input channels (L''1, L''2, L''3,- L''n) to open a gate (P1, P2, P3,- Pn) in one of the n indirect input channels (L''''1, L''''2, L''''3,- L''''n) in response to a signal of equality emitted by itself; an integrator with (n + 1) inputs, receiving the outputs of (n + 1) indirect input channels constituted by the said n channels with gate (L''''1, L''''2, L''''3,- L''''n) and said last channel (L''''o) without gate, and with one output; a storage unit connected to the output of the integrator with (n + 1) channels and storing the value received under the control of the signal of equality emitted by said first comparator; and means for resetting to zero the integrators in response to the signal of equality emitted by said first comparator; and, a system constituted by generators of a function by segments, of a variable (G1, G2, G3; Gz) with an input receiving each x and an output and differential amplifiers (D1, D2; Hz) with two inputs and an output, each of said differential amplifiers receiving at its two inputs the outputs of two such generators of successive ranks, this system supplying the inputs of (N + 1) indirect input channels (L''''o, L''''1, L''''2,L''''3,... -L''''n) of said linear interpolator.