DC_TERM now a #define
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@ -1,6 +1,6 @@
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <math.h>
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@ -33,7 +33,7 @@ two_pole_7_8 ( int16_t input ) {
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// the minus 3 divides by 8 : DOUBLE POLE
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x0 <<= (BIN_FRACS-3) ; // now all calculations are done times BIN_FRACS^2
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// this works really well WHY?
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// this works stabley but not well WHY?
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//y0 = x0 + y1-(y1>>3) - ((y2>>1) + (y2>>2) + (y2>>6));
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// should be
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@ -41,7 +41,7 @@ two_pole_7_8 ( int16_t input ) {
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//
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//
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// OK this works well
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y0 = x0 + (14.0 / 8.0) * (double) y1 - (49.0/64.0) * (double) y2;
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// y0 = x0 + (14.0 / 8.0) * (double) y1 - (49.0/64.0) * (double) y2;
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@ -77,17 +77,22 @@ two_pole_7_8 ( int16_t input ) {
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return y0>>(BIN_FRACS+3); // divide back down for scaling and then divide by 8 filter gain // *res;
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}
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#define RAND_RANGE 100
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#define DC_TERM 1000
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int main () {
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int i;
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int16_t val,res, res34, res78;
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int16_t val,res, res34, res78,rr;
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for (i=0;i<1000;i++) {
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// ramp + some sine
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val = sin ( (double)i*10.0 / (3.142 * 2.0) ) * 10.0 + 25000 ;
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val = sin ( (double)i*10.0 / (3.142 * 2.0) ) * 10.0 + DC_TERM ;
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rr = rand() % (RAND_RANGE*2);
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rr -= RAND_RANGE;
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val += rr;
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// fast sine
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//val = sin ( ((double)i*10.0) / (3.142 * 2.0) ) * 10000;
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