depicted in table 4 for any value of u03b3 the three most significant bits correspond exactly to the binary coding of the number of the sector to which the angle u03b3 belongs while the other seven bits correspond to the same angle scaled in a range 0 u00b0 60 u00b0 representing the angle u03b3 with an integer number comprised in the range 0 768 the logic for recognizing the sector and the rescaled angle u03b3 u2212 u03b3 k implies an extremely small computational burden and relatively simple hardware resources the outputs q 0 and q 1 of the two look up tables relative to sectors 0 and 1 are represented with ten bits in a range t i u03b5 0 1023 thus the stored values in the luts are those represented in fig1 the unsigned representation with ten bits of the waveforms q 0 and q 1 allows reversal of the waveforms with a minimum requisite of hardware resources having stored the curve in sector 1 the desired waveform in sectors 4 and 5 is obtained by negating the output bits of the look up table q 1 as shown in table 5 a circuit diagram capable of executing this operation is illustrated in fig1 by storing only the portions of curve in the sectors 0 and 1 it is possible to obtain with few simple operations the waveforms in the other sectors a technique for reflecting the portion of the waveform q 0 stored in the lut relative to sector 0 is presented hereinafter this operation is necessary when.