?? example 4-14.c
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// Example 4 - 14. Biquad IIR Filter C Listing Using Intrinsic Functions for the TMS320C62x DSP
// Feedback section
mult1 = _mpy(dn_2, a12) >> 15; //d[n-2]*a12
mult2 = _mpy(an_1, a11) >> 15; //d[n-1]*a11
dn = xin - (short)(mult1+mult2)
//d[n]=xin+d[n-2]*a12+ d[n-1]*a11
//Feedforward section
mult3 = _mpy (dn_2, b12) >> 15; //d[n-2]*b12
mult4 = _mpy (dn_1, b10) >> 15; //d[n-2]*b12
mult5 = _mpy (dn, b10) >> 15; //d[n-2]*b12
yout = (short)(mult3+mult4+mult5); //y[n]
//Data shifting
dn_2 = dn_1; //d[n-1] -> d[n-2]
dn_1 = dn; //d[n] -> d[n-1]
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