📄 dac_c.mht
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Date: Wed, 27 Sep 2006 22:33:13 +0800
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<BODY><PRE>/* dac.c - bipolar two's complement D/A converter */
double dac(b, B, R)
int *b, B; /* bits are dimensioned as \(b[0], =
b[1], \dotsc, b[B-1]\) */
double R;
{
int i;
double dac =3D 0;
b[0] =3D 1 - b[0]; /* complement MSB */
for (i =3D B-1; i >=3D 0; i--) /* H\"orner's =
rule */
dac =3D 0.5 * (dac + b[i]);
dac =3D R * (dac - 0.5); /* shift and scale */
b[0] =3D 1 - b[0]; /* restore MSB */
return dac;
}
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