| 摘要 |
<p>The circuit uses a digital generator (10) of periodic phase (phi) varying in a sawtooth pattern. It also uses an approximation of samples of the function (K sin(phi)) by the algebraic sums of positive integer powers of two for each phase value. K is a coefficient which is identical for all the phase values. The product of the digital signal (SN) and these algebraic sums is rapid, simple and only requires a sine table. A decoder (12) receiving the phase (phi) defines the powers of two to establish. A pointing circuit (14) effects the multiplications by the powers of two under the control of the decoder. One or two adders (ADD!, ADD2) establish sum of the powers of two. The result is a value approaching the value of the product SN.Ksin(phi).</p> |
